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ў№ ║S No.Title AbstractPublication YearAuthorJournal/Conference CitationsLinkConstructionMethod/Algorithm/ programDoubly fed induction machineBack-to-back converterDC-DC ConverterMatrix ConverterDC Link OperationControlFilter
ProtectionEnergy storageOthers Dolcera SummaryStator RotorShaft BrushlessBrushes and slip ringGrid side converterRotor side conveter (AC-DC)Switching Device (IGBT) NPT-IGBTs)Cooperative mode (or) Grid connected mode
Isolated modesuper synchronous Sub synchronous
Power controlTorque control
Speed control Frequency
Pitch control
PWM TechniqueFault ride through controlTemp controlcrowbarUPSstorage deviceRotor construction Rotor current controller/LimiterRotor angular position detectorActive PassiveActive powerReactive PowerDecoupled P-Q controlField oriented controlDirect torque controlLow voltage ride throughNetwork fault/Grid fault#Symmetrical and Asymmetrical FaultsiApplication of Matrix Converter for Variable Speed Wind Turbine Driving an Doubly Fed Induction Generator╓ In order to meet power needs, taking into
account economical and environmental factors, wind
energy conversion is gradually gaining interest as a
suitable source of renewable energy.
In this paper, a grid connected wind power generation
scheme using a doubly fed induction generator with a
direct AC-AC matrix converter is proposed. The aims of
this paper are:
- To model and to simulate the operating of a doubly fed
induction generator.
- The analysis employs a stator flux vector control
algorithm and a space vector modulated matrix converter
to control rotor current.
- The matrix converter-based rotor current control scheme
is highlighted.
- The system enables optimal speed tracking for
maximum energy capture from the wind and high
performance active and reactive power regulation used
the RST regulator.
Lastly, the obtained simulation results, for different
operating points, are presented illustrating the good
control performances of the system.
)Ghedamsi, K. Aouzellag, D. Berkouk, E.M. R Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006.
pp. 1201-1205Їhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=1649950&queryText%3DApplication+of+Matrix+Converter+for+Variable+Speed+Wind+Turbine+Driving+an+Doubly+Fed+Induction+Generator%26openedRefinements%3D*%26searchField%3DSearch+Allt)t(stator flux oriented control technique)A matrix converter is replaced with back to back converter in a variable speed wind turbine using doubly fed induction generator. Stable operation is achieved by stator flux oriented control techinque and the sytem opertaed in both sub and super synchronous modes, achieved good results.GA TORQUE TRACKING CONTROL ALGORITHM FOR DOUBLY FED INDUCTION GENERATOR
&In this paper a torque tracking control algorithm for doubly-fed induction generator (DFIG) is proposed. First, a
mathematical model of the doubly-fed induction generator written in an appropriate d - q reference frame is established
to investigate simulations. In order to control the rotor currents of DFIG, a torque tracking control law is synthesized
using PI controllers, while the stator side power factor is controlled at unity level. Results obtained in Matlab/Simulink
environment are presented illustrating good control system performance.
Azeddine Chaiba
"Journal of ELECTRICAL ENGINEERING
VOL. 59, NO. 3, pp. 165-168yhttp://docs.google.com/viewer?a=v&q=cache:HqaFsMBhchcJ:iris.elf.stuba.sk/JEEEC/data/pdf/3_108-8.pdf+A+TORQUE+TRACKING+CONTROL+ALGORITHM+FOR+DOUBLY%E2%80%93FED+INDUCTION+GENERATOR&hl=en&pid=bl&srcid=ADGEESgbHXoAbKe4O7b5DnykDc7h_LaHwCMIhkVrGX_whx4iUuE4Mc-3Rfq1DyW_hgF25CnKrF1ffJioqUbSbtsusJBtGi-tOHclUrJFLRSRAlLUzN4Fe0-3C3Uyl39PbD8VwGK3k4Ah&sig=AHIEtbQkmzi2NewN-zbs-rXed2PWGW1OOQt(PI regulators)╩Proposed a torque tracking control algorithm for Doubly fed induction generator using PI controllers. It is achieved by controlling the rotor currents and using a stator voltage vector reference frame. gDirect Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions=This paper analyzes the effects of unbalanced voltage
on doubly fed induction generators. It also presents a novel control
strategy based on direct power control (DPC+) applied to this
type of generators, predominant in wind energy applications, that
enables them to work under perturbed conditions and achieve
optimum results. Although the technique can be implemented
to control both rotor converters and grid converters, we will
hereby exemplify the former which regulates stator active and
reactive power. The results obtained with DPC+ are then com-
pared through experimental tests to indicate that the technique is
suitable and achieves good dynamic responses while controlling
current distortion, power or torque oscillations. The validation
of results has been performed through experimental tests on a
20-kW generator.
6Santos-Martin, D. Rodriguez-Amenedo, J.L. Arnalte, S. 'IEEE TRANSACTIONS ON POWER ELECTRONICS
&Volume : 23 , Issue:5 pp. 2328-2336Єhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4636745&queryText%3DDirect+Power+Control+Applied+to+Doubly+Fed+Induction+Generator+Under+Unbalanced+Grid+Voltage+Conditions%26openedRefinements%3D*%26searchField%3DSearch+AllйPresented the control strategy based on the direct power control (DPC), to work under perturbed conditions. This technique is used to control the sator and rotor converters to regulate the active and reactive powers in the DFIG system. It shows good responses while controlling current distortion, power or torque oscillations. DPC provides effective control during unbalanced voltage dips by controlling the power or torque.[Direct Torque Control of a Doubly-Fed Induction Generator for Variable Speed Wind Turbines
This paper presents the analysis and design of a Direct Torque Control (DTC ) of a Doubly-Fed Induction Generator applied to a wind generation system as an alternative to the classical field-oriented control (FOC) widely used in drive control. The aims of the control system are the control of the reactive power interchanged between the generator and the grid and the control of the power drawn from the wind turbine in order to track the wind turbine optimum operation point. DTC appeared as a control concept for squirrel cage motor drives. In this paper, DTC concept is applied to control a wound rotor induction generator by means of a rotor connected VSI. Torque and rotor flux control are used to control in an indirect way active and reactive power, respectively.7S. Arnalte; J. C. Burgos; J. L. Rodriacuteguez-Amenedo %Electric Power Components and Systems
pp.199 216Mhttp://www.informaworld.com/smpp/content~content=a713847539~db=all~order=pagePresented a direct torque control (DTC) alternative to field-oriuented control (FOC). With this a fast and decoupled response of torque and flux is achieved. It a two control loop, where DTC torque control loop controls active power and DTC flux control loop controls reactive power. ]Fault Ride Through Capability Improvement Of Wind Farms Using Doubly Fed Induciton Generator EThis paper presents a doubly fed induction generator in a sample distribution network. Grid consist of two distributed generation (DG) units. DG1 is a 5MVA synchronous generator with its excited and governor systems. DG2 is a doubly fed induction generator wind turbine which encompasses a wound rotor induction generator and a partial scale power electronic converter as grid side and rotor side converter. Simulation is performed in PSCAD/EMTDC software. The objective is to keep DFIG connected to the grid in abnormal conditions which is called fault ride-through capability. An active diode bridge crowbar switch is proposed and effects of its parameters in dynamic response of DFIG are investigated. Simulation results show well defin< ed parameters of crowbar maintain stability of DFIG and improve its fault ride-through capability.>Karimi-Davijani, H. Sheikholeslami, A. Livani, H. Norouzi, N. QUniversities Power Engineering Conference, 2008. UPEC 2008. 43rd International pp. 1-5чhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4651578&queryText%3DFault+Ride+Through+Capability+Improvement+Of+Wind+Farms+Usind+Doubly+Fed+Induciton+Generator%26openedRefinements%3D*%26searchField%3DSearch+AllєAn active diode bridge crowbar switch presented to improve fault ride through capability of DIFG. Showed different parameters related to crowbar such a crowbar resistance, power loss, temparature and time delay for deactivation during fault. SGrid Synchronisation OF Doubly Fed Induciton Generators Using Direct Torque ControlИThis paper presents a new control system for grid synchronisation of a doubly fed induction generator used in variable speed turbines. A direct Torque Control (DTC) scheme is used for synchronization and running processes. The proposed control system allows high performance, I.e., grid connection with zero currents and high dynamic behaviour when loading the doubly fed induction generator.Gomez, S.A. Amenedo, J.L.R. V IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the] Volume : 4 pp. 3338-3343▐http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=1182933&queryText%3DGrid+Synchronisation+OF+Doubly+Fed+Induciton+Generators+Using+Direct+Torque+Control%26openedRefinements%3D*%26searchField%3DSearch+All*Presented a direct torque control technique(DTC) shceme is used to synchronize the system with the grid. with this soft and fast synchronization is achieved. After synchronization generator load is controlled by the standarded DTC system. It works well while reclosing the system after grid faults.BHybrid rotor injection scheme for a doubly fed induction generatorDoubly fed induction generators used in wind energy applications require a source and power converter system to feed variable frequency AC voltage to its rotor. The paper presents a hybrid rotor injection system in which the rotor power can be drawn either from three-phase AC mains or a photo voltaic (PV) panel-battery combination. While drawing power from AC mains, the AC-DC converter used has a soft switching feature and also power factor correction. While drawing power from PV panel and battery, one of the MOSFET switches of the AC-DC converter will be used for boosting the PV panel output. The converter is simulated and the line currents show a low total harmonic distortion (THD). The results obtained on an experimental converter system are also presented.Kaderbhai, M. Yuvarajan, S. LPower Electronics and Machines in Wind Applications, 2009. PEMWA 2009. IEEE
pp. 1 - 4 ═http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5208366&queryText%3DHybrid+Rotor+Injection+Scheme+for+a+Doubly+Fed+Induction+Generator%26openedRefinements%3D*%26searchField%3DSearch+AllPProposed a hybrid rotor injection scheme in which the injection can be withdrawn from unity powerfactor from ac mains if available or from photo voltaic(PV) batteries in case isolated systems. The ac-dc converter is used during ac mains operation. Boost converter is used to feed PV power to the rotor resulting in simple poewr circuit.@Modal Analysis of Grid-Connected Doubly Fed Induction GeneratorsqThis paper presents the modal analysis of a grid-
connected doubly fed induction generator (DFIG). The change
in modal properties for different system parameters, operating
points, and grid strengths are computed and observed. The results
offer a better understanding of the DFIG intrinsic dynamics, which
can also be useful for control design and model justification.
Mei, F. Pal, B. 'IEEE TRANSACTIONS ON ENERGY CONVERSION
%Volume : 22 , Issue:3 pp. 728-736╦http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4292194&queryText%3DModal+Analysis+of+Grid-Connected+Doubly+Fed+Induction+Generators%26openedRefinements%3D*%26searchField%3DSearch+All+Presented the modal analysis of the SMIB system with DFIG. The results gives the different modes of DFIG against external system. Small signal behaviour of the system is presented which is useful for small-signal analysis of multimachine power systems with both conventional SG and wind driven DFIG.DModal Analysis of Power Systems with Doubly Fed Induction GeneratorsThis article is concerned with the impact of large scale wind
farms utilising doubly fed induction generators on the stability
of a conventional power system. Inspection of the eigenstruc-
ture of the system provides a foundation for assessment of the
impact, which is then quantified by means of detailed numerical
simulations.
Simplified state-space models are used to describe the dynam-
ics of generators in a very simple system, whose network is de-
scribed by algebraic relations. A third order model is derived
for a doubly fed induction generator. Mathematical models are
used to identify the behavioural patterns of the system when it is
subject to disturbances.
Eigenvalue analysis reveals certain interesting properties of the
system when it is subject to small disturbances. Numerical sim-
ulations show that the addition to a power system of doubly fed
induction generators, such as those found in wind farms, im-
proves the response of the system to small disturbances, but can
have an adverse impact after larger disturbances.
+Elkington, K. Knazkins, V. Ghandhari, M.
R.k Bulk Power System Dynamics and Control - VII. Revitalizing Operational Reliability, 2007 iREP Symposium pp. 1-8╧http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4410524&queryText%3DModal+Analysis+of+Power+Systems+with+Doubly+Fed+Induction+Generators%26openedRefinements%3D*%26searchField%3DSearch+AllJPresented the effect of wind park on a power system. developed a mathematical model of the power system and described the linearisation of the system. showed that for post - disturbance behaviour eigen values are not sufficent, dynamic results are also required. converters used to improve the behaviour of the DFIG during faults.\Modeling and Control of a Doubly Fed Induction Generator (DFIG) Based Wind Conversion SystemпThis paper presents a general modeling and an
experimental validation of a Doubly Fed Induction Generator
(DFIG) based Wind Conversion System (WCS). The Wind
Conversion System has been briefly presented. Then, the d q
control of the Grid Side Converter (GSC) has been detailed
theoretically. Moreover, the decoupled active and reactive powers
control of the DFIG has been presented. The last is carried out by
using the Rotor Side Converter (RSC) to control the direct and
quadrature components of the DFIG rotor currents. Both GSC
and RSC control algorithms are implemented on a DSPACE
board plugged in a Dell PC. The performance of the DFIG control
is verified by experimental results
'Ghennam, T. Berkouk, E.M. Francois, B. 7 Power Engineering, Energy and Electrical Drives, 2009.pp. 507-512эhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4915230&queryText%3DModeling+and+Control+of+a+Doubly+Fed+Induction+Generator+.LB.DFIG.RB.+Based+Wind+Conversion+System%26openedRefinements%3D*%26searchField%3DSearch+AllYPresented the decoupled active and reactive power control of the DFIG. A decoupled dq control is adopted for both GSC and RSC controllers. In GSC control algorithm, the q-component is used for dc voltage regulation and d-component is used for reactive power regulation . DSPACE board is used to implement the both GSC and RSC control algorithms.[Modeling of doubly fed induction generator (DFIG) equipped wind turbine for dynamic studies╕The paper is aimed at presenting the dynamic
behaviour of a wind turbine equipped with a doubly fed
induction generator (DFIG) in case of disturbances in the
interconnected grid. A model of a DFIG is presented and
adapted for analyzing the response of the wind generator to
voltage control, frequency control, voltage sags and wind
variations. Simulations, perf< ormed by a widely used power
system analysis code, are reported and commented.
AMattia Marinelli, Andrea Morini, Andrea Pitto, Federico Silvestropp. 1-6ьhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4651589&queryText%3DModeling+of+doubly+fed+induction+generator+.LB.DFIG.RB.+equipped+wind+turbine+for+dynamic+studies%26openedRefinements%3D*%26searchField%3DSearch+AllPresented a detailed model of the DFIG wind generator and simualtions did in DIGSILENT under different operating conditions like voltage sags, short circuits. The results obtained are more useful for analysis of power systems during severe oscilations in the system.Optimal Power Control Strategy of Maximizing Wind Energy Tracking and Conversion for VSCF Doubly Fed Induction Generator SystemThis paper focuses on the development of
maximum wind power extraction strategies for variable
speed constant frequency (VSCF) grid-connected wind
power generation systems with a doubly fed induction
generator (DFIG). A new optimal control method is
proposed by controlling the generator stator active and
reactive power, which is based on the condition of the
system operation for not only the extracted maximum power
of the wind turbine below the rated wind speed but also the
higher generator efficiency. Based on the DFIG
mathematical models, the optimal stator reactive power
value is derived for minimal machine copper losses.
According to wind turbine power characteristics and
generator power flow equations, the optimal stator active
power reference value is also obtained for capturing
maximal output power from wind turbines. A dual-passage
excitation control strategy is applied to control the active
and reactive power independently. Detailed simulation
results have confirmed the feasibility and performance of
the optimal control strategy.
Li, H. Chen, Z. Pederson, J.K. `Power Electronics and Motion Control Conference, 2006. IPEMC 2006. CES/IEEE 5th International Volume : 3 pp. 1-6
http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4778305&queryText%3DOptimal+Power+Control+Strategy+of+Maximizing+Wind+Energy+Tracking+and+Conversion+for+VSCF+Doubly+Fed+Induction+Generator+System%26openedRefinements%3D*%26searchField%3DSearch+AllФ Proposed a new optimal control strategy of maximum wind power extraction stratagies and testified by simulation. The control algorithm also used to minimize the losses in the generator. The dual passage excitation control strategy is applied to decouple the active and reactive powers. With this control system, the simulation results shows the good robustness and high generator efficiency is achieved.qPerformance Analysis with Power Factor Compensation of a 75 kW Brushless Doubly Fed Induction Generator PrototypeThis paper presents an analysis of a 75 kW Brushless
Doubly Fed Induction Generator (BDFIG) prototype.
Experimental results are presented for the prototype in the
cascade mode that enables a comparison in terms of efficiency
and power factor with an equivalent wound-rotor doubly fed
induction generator. The generator's control system is based on
vector control principles which enable to decouple active and
reactive power control. The power flow in the two stator
windings (power and control windings) and in the grid is
analyzed with and without the reactive compensation capacitor
bank in the grid using a MatLab/Simulink simulation model.
Four cases were studied: (a) the reactive power compensation of
the machine is realized only by the control-side converter; (b) the
reactive power compensation is realized by both converters
(control-side and grid-side converters); (c) the reactive power
compensation of the machine is performed only by the control-
side converter and a capacitor bank connected at the grid
terminals and (d) the reactive power compensation is performed
by both converters and a capacitor bank is connected at the grid
terminals. The main advantage is obtained with the last case
resulting in a significant improvement of the overall system
efficiency.
@Carlson, R. Voltolini, H. Runcos, F. Kuo-Peng, P. Batistela, N.JN Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International Volume : 2 pp. 1502 - 1507№http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4270870&queryText%3DPerformance+Analysis+with+Power+Factor+Compensation+of+a+75+kW+Brushless+Doubly+Fed+Induction+Generator+Prototype%26openedRefinements%3D*%26searchField%3DSearch+All,A 75KW brushless doubly fed induction generator prototype anlaysis was presented. A matlab/ simulink is used to analyse and comapre the results with the DFIG. Presented the results with efficiency just lower than the DFIG and concluded that the maintanance cost and complexity is reduced with BDFIM.SReactive Power Control of a Wind Farm made up with Doubly Fed Induction Generators
пlectrical systems endowed with variable generating
units are called to dominate the electrical landscape in the near
future and new tools are necessary to develop in order to work in
this new environment. Wind power generation is becoming one of
the most important renewable energy sources in Spain and
consequently, the simulation of a wind farm power performance
will be an essential tool for the location of new farms.
Additionally, their active/reactive power regulation possibility
can become very important in the decision making process for
the generator-type that has to be implemented in each wind farm.
The present papers presents two different algorithms for the
regulation of wind farms made up with doubly fed induction
machines (DFIM), simulation results of the developed algorithms
and real results of the implementation in a farm located in the
North of Spain. Part I1 presents the developed reactive power
control algorithms.
LTapia, A. Tapia, G. Ostolaza, J.X. Saenz, J.R. Criado, R. Berasategui, J.L. ! IEEE Porto Power Tech ConferenceVolume : 4 5 pp. vol.4 ▄http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=964830&queryText%3DReactive+Power+Control+of+a+Wind+Farm+made+up+with+Doubly+Fed+Induction+Generators%26openedRefinements%3D*%26searchField%3DSearch+All5Presents two different algorithms for the regulation of wind farms made up with doubly-fed induction machines(DFIM) and Matlab/simulink platform is used for simulation. These are used for reactive power regulation. The control algorithm based on the PI controller is very robust under changes in wind speed. bReal-Time Implementation of a STATCOM on a Wind Farm Equipped With Doubly Fed Induction GeneratorsшVoltage stability is a key issue to achieve the un-
interrupted operation of wind farms equipped with doubly fed
induction generators (DFIGs) during grid faults. This paper in-
vestigates the application of a static synchronous compensator
(STATCOM) to assist with the uninterrupted operation of a wind
turbine driving a DFIG, which is connected to a power network,
during grid faults. The control schemes of the DFIG rotor- and
grid-side converters and the STATCOM are suitably designed
and coordinated. The system is implemented in real-time on a
Real Time Digital Simulator. Results show that the STATCOM
improves the transient voltage stability and therefore helps the
wind turbine generator system to remain in service during grid
faults.
+Wei Qiao Venayagamoorthy, G.K. Harley, R.G.+IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
#Volume : 45 , Issue:1 pp.98-107эhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4757419&queryText%3DReal-Time+Implementation+of+a+STATCOM+on+a+Wind+Farm+Equipped+With+Doubly+Fed+Induction+Generators%26openedRefinements%3D*%26searchField%3DSearch+All*To achieve the uninterrupted operation of DFIG during grid faults a STATCOM IS placed at point of common coupling (PCC) bus, where the DFIG is connected to the grid. Designed suitable controls for RSC, GSC and STATCOM to operate in all conditions. It is implemented in real time digital simulator (RTDS), A short circuit fault is created and cleared, real time implementation shows the results with STATCOM, providing good dynamic voltage support and voltage at PCC re< establishes shortly. It enhances the grid fault ride through capability of the system.АResearch on the Performance of Low Voltage Ride-Through for Doubly Fed Induction Generator Excited by Two-Stage Matrix Converter═A novel algorithm of dual space vector modulation
(SVM) for two-stage matrix converter (TSMC) is proposed, which
does not calculate real-time modulation factor of rectifier stage.
Utilizing grid voltage oriented vector control strategy, decoupling
control for active and reactive power generated by doubly fed
induction generator (DFIG) is proposed. Then the model of
grid-connection wind energy conversion system (WECS) consisting
of doubly fed induction generator (DFIG) excited by TSMC is built
up using MATLAB/SIMULINK. Finally, performances of low
voltage ride-through (LVRT) for WECS using proposal control
strategy under grid fault are illustrated by simulation. And results
indicate: 1. transient performance of LVRT for WECS during grid
fault is good; 2. active and reactive power generated by DFIG
supplying to grid never occur long-time oscillation after grid fault
clearance; 3. proposed control strategy promotes dynamic and
steady-state performances of WECS.
3Wenlang Deng Zhiyong Chen Liming Zhou Yu Yang
Coll.[Power Electronics and Motion Control Conference, 2009. IPEMC '09. IEEE 6th International pp. 638 - 643 http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5157463&queryText%3DResearch+on+the+Performance+of+Low+Voltage+Ride-Through+for+Doubly+Fed+Induction+Generator+Excited+by+Two-Stage+Matrix+Converter%26openedRefinements%3D*%26searchField%3DSearch+AllМProposed an algorithm of dual space vector modulation fopr a two-stage matrix converter(TSMC). Vector control strategy along grid oriented used to achiev the decouple control for active and reactive power generated by DFIG. Using proposed control strategy grid voltage sags are illustrated by simulation. The results indicates good responses under transients, less oscillations after grid faults.WRide-Through Control of a Doubly Fed Induction Generator Under Unbalanced Voltage Sags
This paper deals with the control of doubly fed in-
duction generators to ride through unbalanced voltage sags. A
control strategy is proposed by choosing certain current reference
values in the positive and negative sequences so that the torque
and the dc voltage are kept stable during such unbalanced sags.
Both rotor- and grid-side converters are considered, detailing the
control scheme of each converter while considering the effect of the
crowbar protection. The control strategy is validated by means of
simulations.
?Gomis-Bellmunt, O. Junyent-Ferre, A. Sumper, A. Bergas-Jan, J. 'Volume : 23 , Issue:4 pp. 1036-1045 сhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4675804&queryText%3DRide-Through+Control+of+a+Doubly+Fed+Induction+Generator+Under+Unbalanced+Voltage+Sags%26openedRefinements%3D*%26searchField%3DSearch+All5Presented a control technique to operate DFIG under unbalanced voltage sags, taking into account of presence of positive and negative sequence components in voltages and currents. Designed a control system for GSC and RSC by considering the crowbar protection circuit. validated the model through simulations.jSmall signal stability analysis and optimal control of a wind turbine with doubly fed induction generator
:A novel method using particle swarm optimisation (PSO) is proposed for optimising par-
ameters of controllers of a wind turbine (WT) with doubly fed induction generator (DFIG). The
PSO algorithm is employed in the proposed parameter tuning method to search for the optimal par-
ameters of controllers and achieve the optimal coordinated control of multiple controllers of WT
system. The implementation of the algorithm for optimising the controllers parameters is
described in detail. In the analysis, the generic dynamic model of WT with DFIG and its associated
controllers is presented, and the small signal stability model is derived; based on this, an
eigenvalue-based objective function is utilised in the PSO-based optimisation algorithm to optimise
the controllers parameters. With the optimised controller parameters, the system stability is
improved under both small and large disturbances. Furthermore, the fault ride-through capability
of the WT with DFIG can be improved using the optimised controller. Simulations are performed
to illustrate the control performance.
'Wu, F. Zhang, X.-P. Godfrey, K. Ju, P. IET Gener. Transm. Distrib
"Volume : 1 , Issue:5 pp.751-760Їhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4295002&queryText%3DSmall+signal+stability+analysis+and+optimal+control+of+a+wind+turbine+with+doubly+fed+induction+generator%26openedRefinements%3D*%26searchField%3DSearch+AlliPorosed a method, using partical swarm optimisation(PSO) for optimising parameters of controllers of a wind trubine with DFIG. Implementation of PSO algorithm is very and can find the optimised controller's parameters very quickly. With this the dynamic performance of the wind trubine system can be improved and fault ride through capability can be enbhanced.MSteady State Analysis of Twin Stator Cascaded Doubly Fed Induction Generator
In the near future brushless induction machines
could become the real alternative for the brush-geared
doubly fed induction generators in windmills applications.
Cascaded doubly fed induction generator (CDFIG)
examined in the paper consists of two identical wound rotor
induction machines having their rotors mechanically and
eletrically coupled. In CDFIG both stators of connected
machines are accessible. While stator of the first machine is
directly connected to the grid, the stator currents and
voltages of the second machine can be manipulated for
power generation requirements. The paper presents an
equivalent circuit of CDFIG at steady state as well the
mathematical model of the twin stator cascaded machine.
The PSIM simulation software is used for a preliminary
investigations of CDFIG.
:Marek Adamowicz, Ryszard Strzelecki, Daniel Wojciechowski
4Compatibility in Power Electronics, 2007. CPE '07
pp. 1 - 5 ╫http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4296534&queryText%3DSteady+State+Analysis+of+Twin+Stator+Cascaded+Doubly+Fed+Induction+Generator%26openedRefinements%3D*%26searchField%3DSearch+All(t(Cascaded Doubly fed induction machine)-Presented the investigations on the twin stator cascaded doubly fed induction generator(CDFIG). It doen't need brushes and slip rings. stator of the first machine directly connected to the grid. The stator currents and voltages of second machines can be manipulated for power generation requirements. DStudy on the Control of DFIG and
Its Responses to Grid Disturbances
The paper presents the dynamic model of doubly
fed induction generator (DFIG) including the mechanical model,
the generator model and the PWM voltage source converter
model. The mechanical model uses two-mass model, and the
generator model includes both the stator side and the rotor < side
dynamics. The PWM voltage source converter is modeled as an
average model in which the action of power electronic switches is
neglected. The paper features vector control of DFIG. On the
rotor side converter, the control scheme enables the independent
control of speed and reactive power from the stator. On the grid
side converter, the control scheme is implemented to regulate the
DC voltage and reactive power from the grid as well. In order to
study the influence of the grid disturbances on the DFIG, grid
voltage dip and quick frequency change are simulated with the
engineering software, MATLAB/Simulink. Meanwhile, in the
paper the pole-placement method and internal model control
method are implemented for designing the PI controllers.
9Ming Yin Gengyin Li Ming Zhou Guoping Liu Chengyong Zhao 9 Power Engineering Society General Meeting, 2006. IEEE ╬http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=1709031&queryText%3DStudy+on+the+Control+of+DFIG+and+Its+Responses+to+Grid+Disturbances%26openedRefinements%3D*%26searchField%3DSearch+AllpPresented dynamic model of the DFIG, including mechanical model, generator model, and PWM voltage source coverters. Vector control strategies adapted for both the RSC and GSC to control speed and reactive power independently. controlling desigining methods, such as pole-placement method and the internal model control are used. Matlab/Simulink is used for simulation.вSymmetrical Components-Based Control Technique of Doubly Fed Induction Generators under Unbalanced Voltages for Reduction of Torque and Reactive Power Pulsations ╙This paper presents a control technique to
reduce the effect of unbalanced voltages in the doubly fed
induction generator (DFIG) in wind energy conversion
systems. The unbalanced voltages cause negative effects to
the DFIG such as torque pulsation and increased stator
current. Based on the symmetrical component theory, the
negative sequence of the stator voltage can be extracted
from the three-phase stator voltage and fed to compensate
the rotor voltage to reduce the unbalanced effect. The
magnitude of the compensating negative sequence is
calculated from the negative sequence of the stator voltage
and rotor speed. The proposed method shows a promising
result for reduction of torque and reactive power pulsations.
S. Wangsathitwong
4 Power Electronics and Drive Systems, 2007. PEDS '07pp.1325 - 1330 ,http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4487876&queryText%3DSymmetrical+Components-Based+Control+Technique+of+Doubly+Fed+Induction+Generators+under+Unbalanced+Voltages+for+Reduction+of+Torque+and+Reactive+Power+Pulsations%26openedRefinements%3D*%26searchField%3DSearch+Allt(symmetrical component)sProposed a method based on the symmetrical component theory and combines with the conventional control method. By using negative sequence rotor voltage is compensated which is determined from stator voltage and rotor speed. Through simulations the proposed method significantly reduces the torque and powre oscillations and improves the overall performance of the system.9Three-phase doubly fed induction generators: an overview
_Adjustable speed induction generators, especially the doubly fed induction generators (DFIG), are
becoming increasingly popular due to their various advantages over fixed speed generator systems. A DFIG in
a wind turbine has the ability to generate maximum power with varying rotational speed, ability to control
active and reactive power by the integration of electronic power converters such as the back-to-back
converter, low rotor power rating resulting in low cost converter components, and so on. This study presents
an extensive literature survey over past 25 years on the different aspects of DFIG.
cTazil, M.; Kumar, V.; Bansal, R.C.; Kong, S.; Dong, Z.Y.; Freitas, W.; Mathur, H.D.; ! IET Electric Power Applications
Volume: 4 Issue:2 pp. 75 89
?http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5401012Presented an overview of DFIG model and its operation in both sub and super synchronous modes. Differenet types of control systems used to control the dc bus voltage active and reactive powers with different converters. Preseneted different simulation softwares for DFIG simulation. KDirect control algorithm for doubly fed induction generators in weak grids
An algorithm utilising direct feedbacks of torque and reactive power for the control of a doubly fed
induction generator (DFIG) is proposed. Although the algorithm is based on field-oriented control, the
algorithm calculates the feedback and feed-forward variables in the stator reference frame to reduce the
number of coordinate transformations. Since the algorithm uses a single-loop approach instead of a cascaded
loop design, the tuning of the controller is easier and the response time is faster when compared to those of
most existing methods. The internal model control (IMC) design method is used in the proposed scheme to
formulate the controller parameters. Measures on the possible voltage variations are included to increase the
robustness of the system. Computer simulation and experimental implementation are reported. The results
show that the algorithm can control the torque and reactive power independently. Harmonic distortions
generated by the system are not noticeable because of the use of constant switching frequency.
K.C. Wong S.L. Ho K.W.E. ChengIET Electric Power Applications!Volume: 3 Issue: 4 pp. 371 380
бhttp://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4079749%2F5154105%2F05154118.pdf%3Farnumber%3D5154118&authDecision=-203nProposed an algorithm to control torque and reactive power by direct feed back which reduces number of controlling loops again which reduces the computations time and requirements of the DFIG system. It increases the stability of the system during variations in control parameters. The perforance of the system does not affected by the mechanical oscillations also. >Contribution of DFIG wind turbines to system frequency controlWind power has become the fastest growing renewable energy source around the world, and has become relatively large proportion of total system generation and this procedure will be continuing in future, because of wind power global preference. Because variable speed wind turbine generation (WTG) connects to power system indirectly through converters and other power electronic devices, this makes the generation system dynamic behavior different from conventional generations and decouples the rotor of generator from other parts of power system, so power system inertia will decrease by addition of variable speed WTG. Therefore, if renewable energy systems in today's power system don't capable of contribution in frequency control, rate of change of system frequency (ROCOF) will be increase, and loss of generation or change in system loading may result in critical conditions such as blackout in the system. Meanwhile, modification of wind energy systems inertial response characteristics, or considering internal frequency control loop is necessary to facilitate the increasing integration of wind generation level in power systems. Therefore, the complete dynamic model of doubly-fed WTG systems are implemented to investigate the possibility of their contribution in primary frequency control.0Khaki, B. Asgari, M.H. Sirjani, R. Mozdawar, A. <Sustainable Power Generation and Supply, 2009. SUPERGEN '09.╔http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5348161&queryText%3DContribution+of+DFIG+Wind+Turbines+To+System+Frequency+Control%26openedRefinements%3D*%26searchField%3DSearch+All┌A method was proposed to control the frequency in the power system in the presence of wind trubines under different conditions like 3-ph fault, addition or removal of generation , increase in frequency dependent loads.=Power Flow Control of a Doubly Fed induction Generator (DFIG)NIn this study a robust control of a Doubly-Fed induction machine used in generation mode (D< FIG) is presented. It provides robust regulation of the primary side active and reactive power by the components of the stator currents. This strategy is suitable for both electric energy generation and drice applications. The mathematical model of the machine written in an appropriate d-q reference frame is established to investigate simulations. In order to control the power is synthesized using PI controllers. Their respective performances are in terms of stator currents references tracking.4A. Dendouga, R. Abdessemed, M.L. Bendaas , A Chaiba.KMedwell Journals:International jounal of Electrical and Power Engineering. pp. 132-137?http://www.medwelljournals.com/abstract/?doi=ijepe.2007.132.137╧Decoupled control of active and reactive power control algorithm was proposed . This method increses the roboustness of the systems around synchronous speed and reduces the effect of harmonics in the system.eModeling of Wind Turbines Based on Doubly-Fed Induction Generators for Power System Stability Studies│This paper deals with modeling of the doubly-fed induction generator (DFIG) and the corresponding converter for stability studies. To enable efficient computation, a reduced-order DFIG model is developed that restricts the calculation to the fundamental frequency component. However, the model enhancement introduced in this paper allows the consideration of the alternating components of the rotor current as well, which is necessary for triggering the crowbar operation. Suitable models are presented for the rotor and grid side converters as well as the dc-link, taking into account all four possible operating modes. The proposed model for speed and pitch angle control can be used when wind and rotor speed variations are significant. Simulation results are presented for model verification purposes and also for demonstrating the dynamic behavior of a large offshore wind farm connected through a long undersea cable to the high voltage gridIErlich, I. Kretschmann, J. Fortmann, J. Mueller-Engelhardt, S. Wrede, H. #IEEE Transactions on Power Systems.Ёhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=4282022&queryText%3DModeling+of+Wind+Turbines+Based+on+Doubly-Fed+Induction+Generators+for+Power+System+Stability+Studies%26openedRefinements%3D*%26searchField%3DSearch+All<Presented a reduced order DFIG model suitable for simulation studies but for triggering crowbar switching detailed model for necessary for this proposed a model extension that allows the retention of the simplified model and the simulation structure. This model is mosr suitable for power system simulation studies. 8Study of a simplified model for DFIG-based wind turbinesЬIn the study of the dynamical behavior of doublyfed induction generators (DFIG), for wind power applications, the use of reduced order models is useful in order to design specific control strategies for wind power plants as well as to obtain lightweight computing simulations. Within this field this paper presents a new dynamic model for wind turbines, based on DFIG, able of representing accurately its behavior during both the steady state and the transient of the grid voltage. As it will be proven this model permits to perform an accurate analysis of the system when there is a voltage dip in the grid. In the following a theoretical study of this model will be carried out and the accuracy of its performance will be tested under different conditions, by means of PSCAD/EMTDC simulations, in order to show its reliability. Finally the reliability of the simplified model will be tested in a scaled experimental setup.>Lima, F.K.A. Luna, A. Rodriguez, P. Watanabe, E.H. Aredes, M. AEnergy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE pp. 345-349├http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5316300&queryText%3DStudy+of+a+Simplified+Model+for+DFIG-Based+Wind+Turbines%26openedRefinements%3D*%26searchField%3DSearch+All╛A simlified 2nd order mathematical model of DFIG is proposed by assuming the magnetic circuit of the DFIG is linear, which will be useful when simulating large scale wind power applications.HDynamic Modelling of a Wind Turbine with Doubly Fed Induction Generator
~As a result of increasing environmental concern, more and more electricity is generated from renewable sources. One way of generating electricity from renewable sources is to use wind turbines. A tendency to erect more and more wind turbines can be observed. As a result of this, in the near future wind turbines may start to influence the behaviour of electrical power systems. Therefore, adequate models to study the impact of wind turbines on electrical power system behaviour are needed. In this paper, a dynamic model of an important contemporary wind turbine concept is presented, namely a doubly fed (wound rotor) induction generator with a voltage source converter feeding the rotor. This wind turbine concept is equipped with rotor speed, pitch angle and terminal voltage controllers. After derivation of the model, the wind turbine response to two measured wind sequences is simulated(Slootweg, J.G. Polinder, H. Kling, W.L. 4IEEE Power Engineering Society Summer Meeting, 2001.Volume : 1 pp. 644-649╤http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=970114&queryText%3DDynamic+Modelling+of+a+Wind+Turbine+with+Doubly+Fed+Induction+Generator%26openedRefinements%3D*%26searchField%3DSearch+All A model of variable speed wind turbine (VSWT) with doubly fed induction generator (DFIG) and back to back voltage source converter(BVSC) was derived and contrllollers for controlling speed , pitch and voltage of the system was developed and simulated in differenr wind sequences.]Control of a Doubly Fed Induction Generator in a
Wind Turbine During Grid Fault Ride-Through
АThis paper analyzes the ability of a doubly fed induction generator (DFIG) in a wind turbine to ride through a grid fault and the limitations to its performance. The fundamental difficulty for the DFIG in ride-through is the electromotive force (EMF) induced in the machine rotor during the fault, which depends on the dc and negative sequence components in the stator-flux linkage and the rotor speed. The investigation develops a control method to increase the probability of successful grid fault ride-through, given the current and voltage capabilities of the rotor-side converter. A time-domain computer simulation model is developed and laboratory experiments are conducted to verify the model and a control method is proposed. Case studies are then performed on a representatively sized system to define the feasibility regions of successful ride-through for different types of grid faults)Dawei Xiang Li Ran Tavner, P.J. Yang, S. #Volume : 21 , Issue:3 pp. 652-662чhttp://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=1677655&queryText%3DControl+of+a+Doubly+Fed+Induction+Generator+in+a+Wind+Turbine+During+Grid+Fault+Ride-Through%26openedRefinements%3D*%26searchField%3DSearch+AllїProposed a method to control the rotor side converter during fault ride through control, for this a fast observation is made on stator-flux linkage components . lekage inductance of the machine is increased during the fault ride through control.NControl Strategies of Doubly Fed Induction Generators to Support Grid Voltage
╠The use of wind power has been increasing very fast in the last 10 years. Many new projects for the next 10 years including offshore and onshore wind farms are been developed and planned. The fast growing of the use of wind power has brought new challenges to the Transmission System Operators (TSO) in regions where wind power has reached significant penetration levels like Denmark, United Kingdom, Spain and Germany. According to new grid code requirements wind turbines must remain connected to the grid during grid disturbances and, moreover, they must also contribute to voltage support during and after grid faults. Dynamic models of doubly fed induction generator (DFIG) were developed to investigate the behavior off different converter control and protection strategies of the back-to-back IGBT-based co<nverters during grid fault. The results have showed that reactive power injection by DFIG-based wind farms is limited when the rotor side converter is blocked.=Salles, M. Cardoso, J.R. Grilo, A.P. Rahmann, C. Hameyer, K. ?Electric Machines and Drives Conference, 2009. IEMDC '09. IEEE pp. 1551 - 1556 ╪http://ieeexplore.ieee.org/search/freesrchabstract.jsp?tp=&arnumber=5075410&queryText%3DControl+Strategies+of+Doubly+Fed+Induction+Generators+to+Support+Grid+Voltage%26openedRefinements%3D*%26searchField%3DSearch+AllPresented the dynamic model and it's analysis of DFIG based wind farm connected to a transmission system during grid fault. presented the operation of protection system during the grid fault. DC chopper is used to inject the reactive power during grid fault. Же5ITcc
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