1、A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING PERFORMANCE OF WIND GENERATOR USING DOUBLY-FED INDUCTION GENERATOR INSTITUTE OF ELECTRICAL POWER ENGINEERING Chair Electric Drives and Basics of Electrical Power Engineering M.Sc. Phung, Ngoc LanAthens, Feb/Mar.2006IntroductionConventional control of doub

2、ly fed induction machine (DFIM) in wind generatorBased on the continuous or discreet model of DFIMDecoupling in active- and reactive power (P&Q) controlA voltage dip what happened ?A new control scheme !Decoupling of P&Q is guarantedBetter performance in dynamical operation modeNon-linear control of

3、 DFIM with Exact-LinearizationCurrent model of DFIM is able to be exactly linearized !A new current controller is with only P-Type controllersThe complete control structure is simple.Decoupling is guaranteed - Direct-Decoupling“2A non-linear control algorithm for improving performance of wind genera

4、tor using doubly-fed induction generator Contents DFIM Model and its characters.Conventional control of DFIM in wind generatorExact-Linearization“ Concept and implementation with DFIMControl structure with Direct-Decoupling“Conclusion and prospects3A non-linear control algorithm for improving perfor

5、mance of wind generator using doubly-fed induction generator Contents DFIM Model and its characters.Conventional control of DFIM in wind generatorExact-Linearization“ Concept and implementation with DFIMControl structure with Direct-Decoupling“Conclusion and prospects4A non-linear control algorithm

6、for improving performance of wind generator using doubly-fed induction generator Control system of DFIM in wind generator PM Powermodule; S Switch; L InductorMicrocontroller33PM3SDFIMnPMTransformerLUdcUsUnIrIs5A non-linear control algorithm for improving performance of wind generator using doubly-fe

7、d induction generator Demonstration of voltage-, flux- and current vector in d-q coordinator6A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Electrical model of DFIM in d-q coordinator7A non-linear control algorithm for improving perfor

8、mance of wind generator using doubly-fed induction generator Electrical model of DFIM in state-space Rotor angular speed: Input variable of the model Model of DFIM in state-space shows a bilinear system8A non-linear control algorithm for improving performance of wind generator using doubly-fed induc

9、tion generator Contents DFIM Model and its characters.Conventional control of DFIM in wind generatorExact-Linearization“ Concept and implemetation with DFIMControl structure with Direct-Decoupling“Conclusion and prospects9A non-linear control algorithm for improving performance of wind generator usi

10、ng doubly-fed induction generator Control variables of the active- and reactive powerThe active power P and reactive power Q will be separately controlled through ird and irq 10A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator A control s

11、tructure of DFIM in wind generator11A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Contents DFIM Model and its characters.Conventional control of DFIM in wind generatorExact-Linearization“ Concept and implementation with DFIMControl st

12、ructure with Direct-Decoupling“Conclusion and prospects12A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Why do we apply Exact-Linearization“ ?The nonlinear characters of DFIM Exact linearization guarantees not only the linearity betwee

13、n inputs and outputs but also the decoupling between each pair of input and output variable in the new model - noninteractingPerformance of system in dynamical operation mode should be improvedWith the success of exact-linearization, different methods to design controllers for the new linear model c

14、ould be applied.13A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Exact-Linearization“ the concept (1)Given a nonlinear MIMO-System with m inputs and m outputsthen it is able to transfer the system in another state-space, where the line

15、arity between the inputs and outputs is guaranted.Matrix L is invertiblewhen the following conditions are satisfied:Sum of elements of vector of relative degreeNumber of state variablesRelative degree j-th 14A non-linear control algorithm for improving performance of wind generator using doubly-fed

16、induction generator Exact-Linearization“ the concept (2)With a coordinator transformationAnd with a state feedback controllerThe new linear system will beA coordinator transformationRequirements of knowing the feedback of state variablesThe linearity between inputs and outputs is effective in the wh

17、ole new state-spaceNotice 15A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Exact-Linearization“ Implementation with DFIMConsidering three equations of DFIMwith, then16A non-linear control algorithm for improving performance of wind gen

18、erator using doubly-fed induction generator Exact-Linearization“ Implementation with DFIM (1)The model in state-space will be in form of withBy having Sum of elements of vector of relative degree:Relative degree j-th Matrix L is invertibleExact-linearization of the considering system can be implemen

19、ted with the state feedback controller:17A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Exact-Linearization“ Implementation with DFIM (2)In the new state-space, system will be:In detail:The linearity between inputs and outputs. Decoupl

20、ing between each channel defined as direct-decouplingThe transfer function of the new system consists of only Integration elements The coordinator transformation have only algebraic operationsNotice18A non-linear control algorithm for improving performance of wind generator using doubly-fed inductio

21、n generator Contents DFIM Model and its characters.Conventional control of DFIM in wind generatorExact-Linearization“ Concept and implementation with DFIMControl structure with Direct-Decoupling“Conclusion and prospects19A non-linear control algorithm for improving performance of wind generator usin

22、g doubly-fed induction generator vStructure of the new linear model20A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Control system of DFIM in wind generator with direct-decoupling21A non-linear control algorithm for improving performan

23、ce of wind generator using doubly-fed induction generator Circuit diagram with Plecs22A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Performance of linearized model and current controllerPerformance of w1, y1 (ird) and w2, y2 (irq)irdi

24、rqw1w2Performance of current controllerird* & irdirq* & irq23A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Simulation: Grid voltage and electrical torqueGrid voltage50%75%100%Torque Linear ControlTorque Nonlinear Control24A non-linear

25、 control algorithm for improving performance of wind generator using doubly-fed induction generator Simulation: Active and reactive power P Linear ControlP Nonlinear ControlQ Linear ControlQ Nonlinear Control25A non-linear control algorithm for improving performance of wind generator using doubly-fed induction generator Simulation: Rotor