基于载波移相并联的直驱风力发电并网变流器控制策略  

Control Strategy for Direct-drive Wind Generation Grid Side Converter Based on Carrier Phase Shifting Parallel

作　　者：杨恩星[1] 仇志凌[1] 陈国柱[1] 吕征宇[1] 

机构地区：[1]浙江大学电气学院,浙江省杭州市310027

出　　处：《中国电机工程学报》2009年第21期8-13,共6页Proceedings of the CSEE

基　　金：新世纪优秀人才支持计划项目(NCET-06-0512)

摘　　要：直驱风力发电变流器需要全功率变流器,其网侧变流器设计要求低谐波输出、宽电压工作范围、高可靠性及快速的动态响应能力。受现有功率器件及其开关频率、发热等条件制约,采用单模块的变流器难以满足系统要求,因此采用载波移相并联作为并网变流器,使系统冗余性增强、输出电流控制的等效开关频率和采样频率都得到了提高,输出滤波电感的压降减小,提高了系统动态响应能力。针对载波移相并联变流器的环流问题,通过对载波移相并联系统环流数学模型的分析,提出了一种可以有效抑制环流同时改善系统动态性能的总电流输出外环加环流控制环的控制策略。仿真和实验结果验证了所提控制方案的可行性和有效性。Direct-drive wind generation system needs full-scale power converters, the grid side one of which requires low output total harmonic distortion, broad grid voltage working range, high reliability and fast dynamic response. However, converters adopting single unit power semiconductor cannot meet system requirements due to low switching frequency and high power dissipation of recent power semiconductor devices. A converter based on the carrier phase shifting parallel technology was adopted. It improved system performance by enhancing system redundancy, heightening equivalent switching frequency and sampling frequency controlled by output current, reducing voltage drop on output filtering inductor and implementing a faster dynamic response. Aiming for the problem of circulating current, a novel control strategy that inserted a circulating control loop in addition to the total output current loop and thus significantly suppressed circulating current while ameliorates system dynamic performance was proposed based on analysis of the equivalent mathematical system model. Simulation and experimental results indicate that the control strategy is feasible and effective.

关 键 词：载波相移 环流 变流器 直驱风力发电 

分 类 号：TM315[电气工程—电机] TM464