直驱风电系统中并联逆变器的仿真建模与分析  

Modeling and Simulation of Parallel-Operation Grid Connected Inverter of Direct Drive Wind Power System

作　　者：付勋波[1,2] 鄂春良[1] 李建林[1] 许洪华[1] 

机构地区：[1]中国科学院电工研究所,北京100080 [2]中国科学院研究生院,北京100080

出　　处：《高电压技术》2008年第10期2228-2233,共6页High Voltage Engineering

基　　金：中国博士后基金(20060390092)~~

摘　　要：直接驱动型风力发电系统需要全功率变流器,三相PWM变流器并联运行为首选方案。由于直接并联时产生的零序环流会造成环流损耗甚至功率器件损坏,所以必须加以抑制。为此,深入分析了PWM变流器直接并联时环流产生的机理及采用SVM算法进行调制时零矢量对于环流的影响,并在此基础上提出了基于变化零矢量的SVM环流控制方法;在Matlab/Simulink7.1中建立了3个逆变器模块直接并联的仿真模型并给出了各逆变器的控制框图,利用s函数完成了控制算法的实现。仿真表明:这种并联方案有利于模块化设计,所提的环流控制方法可行,各逆变器模块均流较好,且能够实现电网侧有功和无功功率的独立解耦控制。It is an optimum choice that the direct drive wind power generation system needs full size converter and the paralleled three-phase PWM converter. Because the direct paralleled grid connected inverter has zero sequence circulating current （ZSCC） and it may cause the power lose of the system even the damage of the power devices, ZSCC should be depressed. This paper introduces the principle of the occurrence of ZSCC in direct paralleled grid connect ed inverter of direct drive wind power generation system. The effect of the zero vectors of the SVM method on ZSCC is analyzed in detail. A simplified SVM circulating current control method is proposed which is based on the varied zero vectors. Finally, a simulation model of three-module parallel-operation inverter module is established on Matla/ Simulink7. 1. All the control strategies of the inverters are implemented with s-function. The control chart of each inverter module is given. The results show that the zero-sequence current control method is simple as well as effective and this parallel scheme is suitable for modular design. Besides, the active and reactive power can be decoupled with the controlled strategy.

关 键 词：直驱 并网逆变器 并联运行 零序环流(ZSCC) 零矢量 全功率 

分 类 号：TM464[电气工程—电器]