不平衡电网电压下双馈感应发电机转子侧变换器的比例–谐振电流控制策略  

Proportional-resonant Current Control Scheme for Rotor-side Converter of Doubly-fed Induction Generators 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6期48-56,共9页Proceedings of the CSEE

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

摘　　要：为了研究不平衡电网电压条件下双馈感应风力发电机(doubly-fedinduction generator,DFIG)系统增强运行能力的有效控制策略,提出了网侧、转子侧变换器的比例–谐振电流控制方案以及两者之间的协同控制策略。针对电网电压不平衡条件下DFIG转子侧变换器,提出了一种在两相定子静止αβ坐标系中实施的比例–谐振(proportional-resonant,P-R)电流控制方案,以实现对DFIG转子电流无需正、负相序分解的统一调节。采用正序d+轴电网电压定向简化了各种增强运行能力控制目标下的转子正、负序电流指令值算法,设计了相应的DFIG不平衡控制策略。实验研究表明,这种P-R电流控制方案能够实现转子侧变换器选定控制目标,具备优良的动态调节性能,可增强不平衡电网电压故障下DFIG风力发电机系统的不间断运行能力。In order to investigate the enhanced control and operation of wind power generation systems based on doubly fed induction generators （DFIGs） when the network voltage is unbalanced,a proportional-resonant （P-R） current control scheme and coordinated control strategies for grid-and rotor-side converters （GSC and RSC） are presented. In this paper,with the aim of simultaneously regulating the positive and negative sequence rotor currents without involving any sequential-decomposition process,a P-R current control scheme implemented in the two-phase stator stationary αβ reference frame was proposed for the DFIG＇s RSC when the network voltage is unbalanced. Based on the positive-sequence d＋-axis grid voltage orientation,reference calculations of positive and negative sequence rotor currents were simplified with respect to various enhanced control targets. Associated control scheme for a DFIG wind power generation system during network unbalance was designed and constructed so as to confirm the feasibility of the P-R current controller. Experimental results show that the proposed P-R current control scheme is capable of realizing the RSC＇s control targets with excellent transient performance. As a result,the ride-through capability of DFIG wind generation system under unbalanced network fault conditions is enhanced.

关 键 词：电压不平衡 风力发电 双馈感应发电机 转子侧变换器 比例–谐振控制器 故障下不间断运行 

分 类 号：TM315[电气工程—电机]