Test on High Order Harmonics of Long Cable Connection Point of MMC Under Isolated Island

MA Zhiquan; XU Qunwei; LYU Wentao; LI Pei

doi:10.14044/j.1674-1757.pcrpc.2020.04.026

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Test on High Order Harmonics of Long Cable Connection Point of MMC Under Isolated Island

更新时间：2024-09-14

- Test on High Order Harmonics of Long Cable Connection Point of MMC Under Isolated Island
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 41, Issue 4, Pages: 145-151(2020)
- 作者机构：
  
  国网浙江省电力有限公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2020.04.026
  CLC： TM46;TM711
- Published：2020，
- 稿件说明：
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[1]马智泉,徐群伟,吕文韬,李培.孤岛方式下MMC长电缆连接点的高次谐波测试[J].电力电容器与无功补偿,2020,41(04):145-151.

MA ZHIQUAN, XU QUNWEI, LYU WENTAO, et al. Test on High Order Harmonics of Long Cable Connection Point of MMC Under Isolated Island. [J]. Power capacitor & reactive power compensation, 2020, 41(4): 145-151.
[1]马智泉,徐群伟,吕文韬,李培.孤岛方式下MMC长电缆连接点的高次谐波测试[J].电力电容器与无功补偿,2020,41(04):145-151. DOI： 10.14044/j.1674-1757.pcrpc.2020.04.026.

MA ZHIQUAN, XU QUNWEI, LYU WENTAO, et al. Test on High Order Harmonics of Long Cable Connection Point of MMC Under Isolated Island. [J]. Power capacitor & reactive power compensation, 2020, 41(4): 145-151. DOI： 10.14044/j.1674-1757.pcrpc.2020.04.026.

摘要

MMC是柔性直流配网与交流电网电能转换的核心设备。对变流器交流并网点开展电能质量测试

验证了正常运行下变流器波形质量良好。但孤岛模式弱电网运行条件下

经长距离电缆并网的交流并网点存在超高次谐波谐振现象

并严重劣化了电压波形。本文建立了变流器-长电缆-负载的小系统数学模型

对高频谐波传导的内在机理进行研究。使用Numpy、Scipy等Python开源软件包进行数值分析

论证发生高频谐振的必要前提条件是弱电网

推导了求解固有谐振频率长缆弱网特征方程;得到随着电缆长度增加、桥臂电抗器阻抗增加谐振频率降低等规律;理论计算结果与现场实测结果基本一致。建议长电缆并网的MMC换流器宜在电缆对侧加装高频滤波器抑制弱电网运行的谐波放大。

Abstract

MMC is the core equipment of energy conversion of flexible DC distribution grid and AC power grid.The quality of converter under normal operation is verified by the power quality test at the AC interconnection point of the converter.However

in case of weak grid operation condition at isolated island mode

the AC interconnection point through long distance cable interconnection has high order harmonic resonance phenomena

which degrades seriously voltage waveform.In this paper

small coefficient mathematical model for converter-long cable-load system is set up and the intrinsic mechanism of high frequency harmonic transmission is studied.The Numerical analysis is performed by such Python open source software package as Numpy and Scipy etc.It is verified that the necessary prerequisites for the occurrence of high frequency resonance is the weak power grid.The characteristic equation of long cable and weak grid of inherent resonance frequency is deduced and solved.The rule that the increase resonance frequency of the impedance of bridge arm reactor reduces with the increase of cable length.The theoretical calculation result and the actual measurement result are basically identical.The MMC inverter with long cable interconnection is suggested and high frequency filter is mounted on opposite side of cable to suppress harmonic amplification of weak grid in operation.

关键词

模块化多电平换流器（MMC）现场测试高次谐波孤岛方式柔性直流配电网

Keywords

modular multilevel converter（MMC）site testhigh order harmonicsisolated island modeflexible DC distribution

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