DFIG-GSC feedback linearization direct power control based on LESO
A feedback linearization direct power control strategy is proposed to improve the performance of doubly fed indution generator grid side converter(DFIG-GSC),a strongly coupled nonlinear system.First-ly,a mathematical model of DFIG-GSC with active power and reactive power as variables in the αβ coordinate system was established.The strong coupling term in the model is decoupled by feedback linearization,and the linear model is obtained.Combined with the sliding mode control theory,the control law of the power inner loop is designed.Because the unmodeled parts and uncertain factors in the power inner loop control law will affect the control effect,the linear extended state observer(LESO)is used to observe it and modify its control quantity.At the same time,sliding mode control is used in the outer voltage loop to improve the response speed of DC side voltage.Finally,the simulation model is built and compared with the traditional PI and di-rect power control to verify the rationality and effectiveness of the proposed control strategy.
doubly fed induction generator(DFIG)converterdirect powerfeedback linearizationlinear extended state observer(LESO)
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万方数据
维普
