不平衡电网电压下双馈感应发电机网侧和转子侧变换器的协同控制  

Coordinated Control of Grid-and Rotor-side Converters of Doubly-fed Induction Generator Under Unbalanced Network Voltage Conditions

作　　者：胡家兵[1] 贺益康[1] 王宏胜[1] LIE Xu 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]英国贝尔法斯特女王大学电子电气工程和计算机科学学院,英国,贝尔法斯特,BT95AH

出　　处：《中国电机工程学报》2010年第9期97-104,共8页Proceedings of the CSEE

基　　金：国家自然科学基金(50907057);国家863高技术基金项目(2007AA05Z419)~~

摘　　要：建立了不平衡电网电压下双馈感应发电机(doubly-fed induction generator,DFIG)网侧变换器的数学模型,讨论了交流输入电抗对瞬时有功功率的影响,在此基础上,提出4种可供选择的网侧变换器协同控制目标。为了验证网侧、转子侧变换器协同控制策略的有效性,提出静止αβ坐标系中比例?谐振控制器,使网侧变换器正、负序电流无需分解调节,并构建了DFIG网侧变换器的不平衡控制系统。仿真和实验研究结果表明,所提网侧、转子侧变换器协同控制策略可实现风电机组更为优化的不对称故障穿越(不间断)运行控制;所设计的网侧、转子侧变换器P-R电流控制方案不仅能够在稳态不平衡电网下提供精确的电流调节,而且在瞬态不平衡下体现优良的动态响应特性。Based on the mathematical model of doubly-fed induction generator＇s （DFIG） grid-side converter （GSC） during network voltage unbalance, the impact of ac input inductance on instantaneous active power was discussed. According to the rotor-side converter＇s control aim, four alternatively coordinated control targets were presented. In order to validate the coordinated control strategies of grid- and rotor-side converters, a proportional-resonant （P-R） current control scheme in the o^fl reference frame was developed and constructed. As a result, the positive and negative sequence currents were regulated without involving any sequential extractions. Simulated and experimental results show that the proposed coordinated control of GSC and rotor-side converter provides enhanced uninterruptable operation capability for DFIG wind power generation system. The developed P-R current control schemes for grid- and rotor-side converters are not only capable of regulating current precisely under steady-state unbalanced network voltage conditions, but also show pretty good dynamic performance during transient network unbalance.

关 键 词：电压不平衡 风力发电 双馈感应发电机 网侧变换器 协同控制 比例-谐振控制 不对称故障穿越(不间断)运行 

分 类 号：TM315[电气工程—电机]