电器与能效管理技术 ›› 2021, Vol. 0 ›› Issue (3): 68-75.doi: 10.16628/j.cnki.2095-8188.2021.03.013

• 电能质量 • 上一篇    下一篇

不对称交流电网下MMC-HVDC系统谐波分析

陈和洋1, 郭峰2, 叶荣3   

  1. 1.国网龙岩供电公司, 福建 龙岩 364000
    2.国网泉州供电公司, 福建 泉州 362000
    3.国网福州供电公司, 福建 福州 350009
  • 收稿日期:2020-12-27 出版日期:2021-03-30 发布日期:2021-04-14
  • 作者简介:陈和洋(1994—),男,主要从事柔性直流输电系统的谐波分析与抑制技术研究。|郭峰(1995—),男,主要从事低压配电网人身触电保护。|叶荣(1994—),男,主要从事电力系统故障诊断。

Harmonic Analysis of MMC-HVDC System in Asymmetric AC Power Grid

CHEN Heyang1, GUO Feng2, YE Rong3   

  1. 1. State Grid Longyan Power Supply Company, Longyan 364000, China
    2. State Grid Quanzhou Power Supply Company, Quanzhou 362000, China
    3. State Grid Fuzhou Power Supply Company, Fuzhou 350009, China
  • Received:2020-12-27 Online:2021-03-30 Published:2021-04-14

摘要:

当柔性直流输电系统(MMC-HVDC)所连接的交流系统发生不对称故障时,换流站的交流母线电压不再平衡,存在负序分量和零序分量,这使得柔性直流输电系统中的交直流侧谐波分布情况变得比较复杂。为了研究该情况下系统交直流侧谐波电压和谐波电流的传递规律,以及桥臂的瞬时功率波动情况,首先基于对称分量法和动态相量进行理论推导,然后在PSCAD/EMTDC中搭建了仿真模型。最后,根据仿真结果对稳态和故障状态下的电压电流谐波分布情况进行分析,验证了不对称故障状态下交直流侧谐波的传递和桥臂功率波动规律,为相关抑制和控制策略提供参考。

关键词: 不对称故障, 柔性直流输电, 谐波分析, 功率波动, 负序分量

Abstract:

When an asymmetrical fault occurs in the AC system connected to the MMC-HVDC,the AC bus voltage of the converter station is no longer balanced,and there are negative sequence components and zero sequence components,which makes the distribution of harmonic on the AC-DC side of MMC-HVDC more complicated.In order to study the transmission law of harmonic voltage and harmonic current on the AC-DC side of the system,as well as the instantaneous power fluctuations of the bridge arm in this case,this paper firstly derives theoretically based on the symmetrical component method and dynamic phasor,and then builds the simulation model in PSCAD/EMTDC.Finally,the voltage and current harmonic distribution in the steady state and the fault state are analyzed according to the simulation results,and it verifies the transmission of harmonics on the AC-DC side and the law of bridge arm power fluctuations in the asymmetric fault state which provides references for related suppression and control strategies.

Key words: asymmetric fault, MMC-HVDC, harmonic analysis, power fluctuation, negative sequence component

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