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ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (11): 538-545.DOI: 10.19912/j.0254-0096.tynxb.2021-0001

• • 上一篇    

模块化多电平变流器的高频谐振分析

王方洲1, 刘开培1, 朱蜀1, 陈满2, 彭若晨3   

  1. 1.武汉大学电气与自动化学院,武汉 430072;
    2.中国南方电网调峰调频发电有限公司,广州 510630;
    3.西南大学工程技术学院,重庆 400700
  • 收稿日期:2021-01-01 出版日期:2022-11-28 发布日期:2023-05-28
  • 通讯作者: 刘开培(1962—),男,博士、教授、博士生导师,主要从事直流输电技术、电能质量及非线性控制技术方面的研究。kpliu@whu.edu.cn
  • 基金资助:
    国家重点研发计划(2017YFB0903700; 2017YFB0903705)

HIGH FREQUENCY RESONANCE ANALYSIS OF MODULAR MULTIPLE CONVERTERS

Wang Fangzhou1, Liu Kaipei1, Zhu Shu1, Chen Man2, Peng Ruochen3   

  1. 1. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;
    2. CSG Power Generation Company, Guangzhou 510630, China;
    3. College of Engineering and Technology, Southwest University, Chongqing 400700, China
  • Received:2021-01-01 Online:2022-11-28 Published:2023-05-28

摘要: 首先基于动态向量方法建立模块化多电平变流器(MMC)主电路的10阶状态空间模型,然后根据实际工程建立包含电压电流内环控制、功率外环控制和环流控制在内的MMC控制器状态空间模型。考虑控制环节中存在的采样和计算等延时,采用Pade近似方法对非线性延时环节进行线性化,构建计及延时的MMC换流器与弱电网连接的系统状态空间模型。基于特征值法分析状态空间模型的谐振模态,分析实际MMC-HVDC工程产生高频谐振的机理并分析控制器输入输出延时对稳定性影响关系。通过仿真算例验证该文MMC换流器状态空间模型和高频谐振机理分析的正确性。

关键词: 变流器, 谐振, 稳定性分析, 新能源并网, 动态向量, 特征值法

Abstract: First, based on the dynamic vector method, the 10th-order state space model of the main circuit of the Modular Multilevel Converter (MMC) is established, and then based on the actual project, the inner loop control of voltage and current, the outer power loop control and the circulating current, the state space model of the MMC controller within the control. Considering the sampling and calculation delays in the control link, the Pade approximation method is used to linearize the nonlinear delay link, and the system state space model of the MMC converter and the weak grid connection with the delay is constructed. Based on the eigenvalue method, the resonance mode of the state space model is analyzed, and the mechanism of the actual MMC-HVDC project's high-frequency resonance and the influence of the controller input and output delay on the stability are analyzed. The simulation examples verify the correctness of the MMC converter state-space model and high-frequency resonance mechanism analysis in this paper.

Key words: converters, resonance, stability analysis, new energy integration, dynamic phasor, eigenvalue method

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