引入比例—谐振控制器的双馈风电机组空载并网控制  

Idle Load Cutting-in Control of Doubly-fed Induction Generators with Proportional Resonant Controllers

作　　者：张文娟[1] 高勇[2] 

机构地区：[1]宝鸡文理学院电子电气工程系,陕西省宝鸡市721007 [2]西安理工大学电子工程系,陕西省西安市710048

出　　处：《电力系统自动化》2011年第18期25-30,35,共7页Automation of Electric Power Systems

基　　金：陕西省"13115"科技创新工程重大科技专项(2007ZDKG-29)

摘　　要：在常规的变速恒频风力发电系统空载并网矢量控制策略中,由于转子电流采样信号的漂移以及模数转换的偏差等原因,使得所控制的转子电流中出现直流偏量。此直流偏量经dq变换产生转差频率的交流量,而比例—积分(PI)控制器在跟踪交流信号时存在静差,因此导致双馈感应发电机(DFIG)空载定子电压包络线出现不同程度的脉动,从而严重影响系统并网性能。提出了PI控制与比例—谐振(PR)控制相结合的空载并网控制策略,对转差频率的交流量进行补偿,进一步改善常规PI控制存在的不足,提高空载定子电压电能质量。在前述理论分析基础上进行了仿真和实验研究,通过与PI控制的对比,验证了PI并联PR控制的有效性。In the conventional idle load cutting-in vector control scheme of a variable-speed constant-frequency wind power generator,a DC bias of the rotor current exists because of the drift of sample signals and the deviation of A/D transformation.The DC bias is transformed into a slip-frequency AC signal by dq transformation.However,a proportional-integral（PI） controller cannot obtain a zero steady-state error for AC inputs,which results in pulses of the idle load stator voltage envelope of a doubly-fed induction generator（DFIG）.Therefore the performance of the idle load cutting-in control is seriously affected.An idle load cutting-in control strategy based on PI and proportional resonant（PR） controllers is proposed,in which the slip-frequency AC signal can be compensated by PR controller to overcome the shortage of PI controller and improve the quality of idle load stator voltage.Simulations and experiments are carried out to show the effectiveness of PI and PR joint control.

关 键 词：变速恒频 风力发电 双馈感应发电机(DFIG) 空载并网 比例—谐振(PR)控制器 

分 类 号：TM614[电气工程—电力系统及自动化]