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联接弱交流电网的双馈入VSC系统小信号稳定性分析与虚拟阻抗控制策略 被引量:1

Small Signal Stability Analysis of Dual Infeed VSCs Connected to Weak AC System and Design of Virtual Impedance Control Strategy
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摘要 联接弱交流电网双馈入VSC系统的小信号稳定性会受到主电路与控制器参数等多种因素的影响。不同于联接弱交流电网单馈入VSC系统,并联VSC之间的相互影响同样会引入系统不稳定问题。首先建立了双馈入VSC系统的小信号模型,基于参与因子分析方法提出了变量参与度的评价指标,得到了影响系统稳定运行特性的相关因素;其次,采用特征值分析法分析了系统参数与小信号稳定性之间的关系;最后,提出了增强双馈入VSC系统小信号稳定性,提高功率传输极限的控制策略。所得结论为:并联VSC系统的小信号稳定性会受到控制器参数与之间电气距离的影响,通过提出的虚拟阻抗控制器能够极大地增强系统小信号稳定性,提高系统功率传输极限。在PSCAD/EMTDC中搭建了双馈入VSC系统模型,仿真结果验证了结论的正确性与控制策略的有效性。 The small signal stability of dual infeed VSCs integrated to weak ac system is affected by main circuit, control system parameters and other factors. The interaction between parallel connected VSCs can lead to system unstability, which is different from single infeed VSC connected to the weak ac grid. The small signal model of dual infeed VSCs connected to weak ac system is established. Based on the participation factor analysis method, an evaluation index of variable participation degree is proposed to figure out the relevant elements of the system stability. Secondly, the relationship between system parameters and stability is analyzed by eigenvalue analysis method. Thirdly, a coordinated control method is proposed to enhance the system stability and improve the power transmission limitation of dual infeed VSCs. It can be concluded that the system stability can be influenced by electrical proximity and controller parameters. With the proposed virtual impedance controller, the small signal stability of the dual infeed VSCs system has beengreatly enhanced. The simulation model of dual infeed VSCs connected to weak ac system is established by PSCAD/ EMTDC. The correctness and validity of all conclusions are validated by the simulation results.
作者 苑宾 袁艺嘉 许建中 赵成勇 黄莹 赵晓斌 辛清明 YUAN Bin YUAN Yijia XU Jianzhong ZHAO Chengyong HUANG Ying ZHAO Xiaobin XIN Qingming(State Key Laboratory of Ahernate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China)
出处 《华北电力大学学报(自然科学版)》 CAS 北大核心 2016年第6期38-46,共9页 Journal of North China Electric Power University:Natural Science Edition
关键词 双馈入VSC 弱交流电网 小信号稳定性 变量参与度 虚拟阻抗控制 dual infeed VSCs weak ac system small signal stability variable participation degree virtual impedancc control
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