模块化多电平中压变流器阻抗分析及次/超同步振荡抑制

GAO Shang

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模块化多电平中压变流器阻抗分析及次/超同步振荡抑制

更新时间：2025-08-13

- 模块化多电平中压变流器阻抗分析及次/超同步振荡抑制
- Automation of Electric Power Systems Vol. 43, Issue 6, Pages: 116-121(2019)
- 作者机构：
  
  江苏省智能电网技术与装备重点实验室(东南大学),江苏省,南京市,210096
- 作者简介：
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- Published：2019
- 稿件说明：
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GAO Shang. [J]. Automation of electric power systems, 2019, 43(6): 116-121.
DOI：

GAO Shang. [J]. Automation of electric power systems, 2019, 43(6): 116-121. DOI：

摘要

模块化多电平换流器适合作为中高压电网的并网接口，针对光伏中压直流汇集系统潜在次/超同步振荡问题，从频域出发，系统地建立了送端电流源型并网模块化多电平变流器的正负序阻抗模型，对并网时互联系统的稳定性作出分析。频域正负序阻抗与电网阻抗交叠预测了串联补偿下光伏中压直流汇集系统次/超同步振荡现象，并验证了频域阻抗与时域波形分析的一致性。通过控制参数优化，有效抑制了模块化多电平换流器串联补偿时次/超同步振荡现象。

Abstract

Modular multilevel converter(MMC)is suitable for grid-connected interface for medium and high voltage power grids. For the potential sub-synchronous and super-synchronous oscillation problem in photovoltaic(PV)medium voltage direct current(DC)power collection system

the positive and negative sequence impedance models of MMC converter are systematically established and the basis of the stability analysis for grid-connected MMC inverters is provided from the frequency domain. Positive and negative sequence impedance overlaps with the grid impedance

which predicts the sub-synchronous and super-synchronous oscillation of the PV medium-voltage DC power collection system under series compensation and verifies the consistency of frequency domain impedance and time domain waveform analysis. By controlling the parameter optimization

the sub-synchronous and super-synchronous oscillation phenomenon of the MMC under series compensation is effectively suppressed.

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