H桥级联多电平STATCOM在风电场中的应用

摘要

建立了双馈感应发电机( DFIG)的数学模型,分析了静止同步补偿器(STATCOM)的工作原理和主电路结构.针对H桥级联多电平STATCOM,提出应用错时采样空间矢量调制对其进行控制,在电网电压发生瞬时跌落的情况下对STATCOM的补偿特性进行了分析研究.结果表明,H桥级联多电平STATCOM能有效补偿风电场的无功功率,改善风电场的电压稳定性,提高了低电压穿越能力.%This paper establishes the model of doubly-fed induction generator,and the operation principle of static syn chronous compensator(STATCOM) is researched as well as the main circuit structure.According to cascade H-bridge multilevel STATCOM, sampling time staggered SVM (STS-SVM) is proposed to control the H-bridge STATCOM.When power grid voltage sags happen, simulations on compensation characteristics of STATCOM are studied.The results illus trate that the reactive power of wind farm can be compensated effectively, and the voltage stability of wind farm can be improved.At the same time,cascade H-bridge multilevel STATCOM improves the low voltage ride through capability.