抑制负序和谐波电流的永磁直驱风电系统并网控制策略  

A Grid-Connection Control Strategy to Suppress Negative-Sequence and Harmonic Currents for Permanent Magnet Direct-Driven Wind Power Generation System

作　　者：姚骏[1] 陈西寅[1] 廖勇[1] 李辉[1] 黄嵩[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《电网技术》2011年第7期29-35,共7页Power System Technology

基　　金：国家863高技术基金项目(2007AA05Z422);国家自然科学基金项目(51007097);中央高校基本科研业务费资助项目(CDJZR11150009)~~

摘　　要：在详细分析永磁直驱风力发电系统并网电流负序分量及谐波分量产生机理的基础上,从改善永磁直驱风电系统输出电能质量的角度出发,提出了一种采用准比例谐振(quasi-proportional-resonant,quasi-PR)控制器抑制并网负序电流分量及谐波电流分量的控制策略。该控制策略不仅可有效抑制由电网电压不平衡引起的并网电流负序分量,而且能抑制由电网电压或发电系统引入的低次谐波电流分量。仿真验证了上述控制策略的正确性和可行性。On the basis of detailed analysis on the mechanism causing negative-sequence and harmonic currents during the grid-connection of permanent magnet direct-driven wind power generation system, to improve the output power quality of permanent magnet direct-driven wind power generation system a control strategy, in which the quasi-proportional-resonant （quasi-PR） controller is adopted, is proposed. The proposed controller not only can effectively suppress the negative-sequence component in grid-connecting current due to unbalance of network voltage, but also can suppress the low-order harmonic currents from network voltage or generation system. The correctness and feasibility of the proposed control strategy are verified by simulation results.

关 键 词：风力发电 永磁同步发电机 电网电压不平衡 谐波 准比例谐振控制器 

分 类 号：TM614[电气工程—电力系统及自动化]