双馈风机电网侧变换器控制方法研究  

Research on Control Strategy for Grid-side Converter of Doubly-Fed Induction Generator

作　　者：冯盼盼[1] 马林生[1] 胡元啸[1] 李起[1] 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《陕西电力》2012年第10期48-52,共5页Shanxi Electric Power

摘　　要：在双馈风机风力发电中,转子侧广泛采用双PWM变换器作为风机励磁及控制器件。针对靠近电网侧的PWM变换器的控制方法进行研究,分析了传统直接功率控制方法的原理和特点,针对开关表的使用导致系统开关频率不固定的问题,提出了使用空间电压脉宽调制(Space Voltage Vector Pulse Width Modulation,SVPWM)技术代替开关表的控制策略,以达到固定开关频率的效果,同时将虚拟磁链(Virtual Flux,VF)理论引入直接功率控制策略中,大大价低了系统复杂程度。仿真结果表明,基于VF-SVPWM的直接功率控制的方法,达到了固定开关频率、降低系统复杂性以及实现电网侧PWM变换器交流侧单位功率因数运行的效果,系统具有良好的动静态性能。In doubly-fed wind power generation, dual-PWM converters are widely used in the side of the rotor as the excitation and control devices of wind turbine. This paper carries on the research on control strategy for grid-side PWM converter, analyzes the principle and characteristics of traditional direct power control, and puts forward a novel control strategy for direct power control using space voltage vector pulse width modulation （SVPWM） technology instead of switching table in order to solve the problem of switching frequency unfixed caused by the use of traditional switching table, meanwhile, the theory of virtual flux（VF） is introduced to the direct power control strategy , and the system complexity is reduced greatly. Simulation results show that VF-SVPWM-based control strategy can fix the switching frequency, reduce the system complexity and achieve unity power factor running of AC side. The system ilas a good performance of dynamic and static response.

关 键 词：直接功率控制 PWM变换器 虚拟电网磁链 SVPWM控制 

分 类 号：TM614[电气工程—电力系统及自动化]