电工技术学报  2019, Vol. 34 Issue (10): 2116-2129    DOI: 10.19595/j.cnki.1000-6753.tces.181981
高比例可再生能源电力系统规划与运行专题 |
双馈风电场孤岛经模块化多电平换流器直流输电并网系统小信号稳定性分析与振荡抑制方法
王一凡, 赵成勇, 郭春义
新能源电力系统国家重点实验室(华北电力大学) 北京 102206
Small Signal Stability and Oscillation Suppression Method for Islanded Double Fed Induction Generator-Based Wind Farm Integrated by Modular Multilevel Converter Based HVDC System
Wang Yifan, Zhao Chengyong, Guo Chunyi
State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 风电场孤岛经模块化多电平换流器直流输电(MMC-HVDC)系统并网已成为规模化风电外送及消纳的重要手段之一。孤岛风电场出力受风速影响存在多变的功率运行点,导致其经内部动态特性复杂的MMC并网时,很有可能在某些功率运行点处出现振荡失稳现象。本文首先建立双馈风电场孤岛经MMC-HVDC并网系统的详细小信号模型,并通过详细电磁暂态仿真分析证明了模型的正确性。然后通过特征根法研究风电场出力变化时并网系统的小信号稳定性,并基于参与因子法揭示导致系统失稳的主导模式及关键参数,指出环流抑制控制器(CCSC)参数对并网系统稳定性影响很大,若CCSC参数不合理,随着风电场输出功率增加,并网系统容易出现振荡失稳现象。最后综合考虑CCSC独立控制环节的动态特性及整个并网系统的小信号约束,提出一种可以有效抑制双馈风电场孤岛经MMC-HVDC并网系统小信号失稳现象的方法。
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王一凡
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关键词 双馈风电场孤岛系统模块化多电平换流器环流抑制控制器小信号稳定性参数优化调节    
Abstract:The grid integration of islanded double fed induction generator (DFIG)-based wind farms by modular multilevel converter based HVDC (MMC-HVDC) has become an important solution for large-scale wind power transmission and consumption. The islanded wind farm has many different power operating points, which leads to oscillation instability when the MMC with complex internal dynamic characteristics is integrated to the power grid. Firstly, a small-signal model of the integrated system is developed in Matlab, and is validated by the detailed electromagnetic transient simulation in PSCAD/EMTDC. Then, the eigen-analysis is used to study the small-signal stability of the integrated system with the output power of wind farm changes. Based on the participation factor method, the dominate mode and the key parameters leading to the system instability are revealed. The results show that the parameters of circulating current suppression controller (CCSC) have great influence on the stability of the integrated system. If the parameters of CCSC are unreasonable, with the increase of the output power of the wind farm, the system appears oscillation instability. Finally, considering the dynamic characteristics of the CCSC and the constraints of the stability of the whole integrated system, a method is proposed to effectively suppress the small signal instability of the system of DFIG-based wind farms via the MMC-HVDC integrated system.
Key wordsDouble fed induction generator (DFIG)    islanded system    modular multilevel converter (MMC)    circulating current suppression controller (CCSC)    small-signal stability    optimization of parameters   
收稿日期: 2019-01-23      出版日期: 2019-05-29
PACS: TM731  
基金资助:国家自然科学基金资助项目(51877077)
通讯作者: 赵成勇,男,1964年生,教授,博士生导师,研究方向为高压直流输电。E-mail:chengyongzhao@ncepu.edu.cn   
作者简介: 王一凡,男,1988年生,博士研究生,研究方向为柔性直流输电、新能源并网稳定与控制。E-mail:wyf880511@163.com
引用本文:   
王一凡, 赵成勇, 郭春义. 双馈风电场孤岛经模块化多电平换流器直流输电并网系统小信号稳定性分析与振荡抑制方法[J]. 电工技术学报, 2019, 34(10): 2116-2129. Wang Yifan, Zhao Chengyong, Guo Chunyi. Small Signal Stability and Oscillation Suppression Method for Islanded Double Fed Induction Generator-Based Wind Farm Integrated by Modular Multilevel Converter Based HVDC System. Transactions of China Electrotechnical Society, 2019, 34(10): 2116-2129.
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