H∞ robust control for wind power systems based on doubly fed induction generators
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摘要: 研究了變速恒頻雙饋感應風力發電系統的魯棒控制問題.利用基于定子磁場定向的矢量變換技術,建立了同步旋轉坐標系下雙饋感應發電機的狀態空間模型,為了降低控制器的階數以利于工程實現,對該動態數學模型進行了合理簡化.針對最大功率點跟蹤控制中建模誤差、外部干擾等不確定性的影響,應用H∞魯棒控制理論,設計了具有魯棒干擾抑制作用的電機轉子電壓控制器.仿真結果表明,即使在參數變化、未建模動態等不確定因素以及風速突變干擾下,所設計的控制器仍可保證電機轉速很好地跟蹤指令值,使風力發電系統最大效率地吸收風能.Abstract: The robust control problem was studied for variable speed-constant frequency(VSCF) wind energy conversion systems based on doubly fed induction generators(DFIG).Using vector transformation a state space model of DFIG was established when the synchronous frame was linked to the stator flux.The dynamic model was simplified reasonably to reduce the order of the controller to be actualized easily in fact.Aiming at the influence of modeling error and gust in maximum power points tracing(MPPT) control,a robust rotor voltage controller was designed by using H∞ robust control method,which makes the system have the robust performance of restraining external disturbances.Simulation results validate that the conversion system with the controller proposed above can trace the reference command exactly and achieve the maximum energy from wind even if with the uncertainty of parameter variety and unmodeled dynamic and external disturbances.
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