不平衡电压下双馈电机的正负序直接电压控制  

POSITIVE AND NEGATIVE SEQUENCE DIRECT VOLTAGE CONTROL OF DFIG UNDER UNBALANCED VOLTAGE

作　　者：陈思哲[1] 张淼[1] 吴捷[2] 

机构地区：[1]广东工业大学自动化学院,广州510006 [2]华南理工大学电力学院广东省绿色能源技术重点实验室,广州510640

出　　处：《太阳能学报》2012年第7期1080-1087,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金重点项目(60534040);广东省重大科技专项(2009A080304011);广东省"211工程"资助(粤发改[431]);广东省中山市工业攻关项目(20114A232)

摘　　要：提出双馈感应电机(DFIG)的正负序直接电压控制(DVC)方法,以实现电网电压不平衡工况下DFIG风力发电机组的无冲击并网控制。控制器由正序DVC和负序DVC组成,正序DVC控制定子正序电压跟踪电网正序电压,负序DVC控制定子负序电压跟踪电网负序电压。仿真和实验结果表明,提出的正负序DVC方法有效地控制DFIG的定子电压实现对不平衡电网电压的精确跟踪,从而在电网电压不平衡工况下使DFIG满足无冲击并网条件,保证风力发电机组和电网的安全稳定运行。A positive and negative sequence direct voltage control （DVC） scheme of doubly-fed induction generator （DFIG） was proposed to synchronize the wind energy conversion system based on DFIG to the power grid under un- balanced grid voltage. The controller is composed of a positive sequence DVC and a negative sequence DVC. The positive sequence DVC controls stator positive sequence voltages to follow grid positive sequence voltages, and the negative sequence DVC controls stator negative sequence voltages to follow grid negative sequence voltages. Simula- tion and experimental results indicated that the proposed positive and negative sequence DVC scheme effectively control the stator voltages of DFIG to accurately follow unbalanced grid voltages, which enables the DFIG to satisfy no-impact cutting-in condition under unbalanced grid voltage and guarantees the secure operation of both the wind energy conversion system and the power grid.

关 键 词：风力发电 双馈感应电机 直接电压控制 不平衡电压 

分 类 号：TM315[电气工程—电机] TM614