转差率变化时并网双馈风力发电机之间的功率传递及谐波干扰  

Research on Power Flow and Harmonic Interference Between Grid Connected DFIGs Under Slip Change

作　　者：袁至[1] 王维庆[1] 

机构地区：[1]可再生能源发电与并网技术教育部工程研究中心(新疆大学),新疆维吾尔自治区乌鲁木齐市830047

出　　处：《电网技术》2016年第8期2503-2509,共7页Power System Technology

基　　金：教育部创新团队资助项目(IRT1285);高等学校博士学科点基金(优先发展领域)项目(20126501130001);新疆维吾尔自治区重大科技攻关计划资助项目(201230115)~~

摘　　要：检修维护完毕的双馈风力发电机并网后,当工作在亚同步发电状态时,其转子会吸收工作在超同步发电状态的双馈风力发电机产生的有功功率,伴随着功率传递而产生的谐波干扰会影响风力发电机的正常工作。而在亚同步发电状态下,双馈电机的转差率和转子侧吸收的有功功率有着直接的联系。通过双馈电机的等效电路对转差率变化时亚同步发电状态下双馈电机转子吸收的有功功率进行了理论分析,推导出了转差率、定子电流矢量与转子侧吸收有功功率的实时关系公式,之后通过算例分析了转差率减小时转子吸收有功功率的变化规律。在Matlab/Simulink中建立模型进行谐波干扰仿真,计算出了总谐波含量均方根值的变化情况,并分析出了伴随功率传递所产生谐波干扰的变化规律。After maintenance and grid integration, rotors of doubly-fed inductive generators（DFIGs） in sub-synchronous condition will absorb active power generated by other DFIGs in hyper-synchronous condition. Harmonic interference caused by power flow between DFIGs will impact their operation. In sub-synchronous condition, slip is directly related to active power absorbed by DFIG rotors. This paper uses DFIG equivalent circuit to analyze active power absorbed by DFIG rotors in sub-synchronous condition under slip change and deduces real-time formula of slip, stator current and rotor power. Then change rule of active power absorbed by rotors is analyzed with an example when slip is reduced. This paper builds a model, performs simulation in Matlab/Simulink, calculates total harmonic RMS value, and analyzes change rule of harmonic interference caused by power flow.

关 键 词：双馈风力发电机 亚同步 转差率 谐波干扰 

分 类 号：TM614[电气工程—电力系统及自动化]