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不平衡电网电压下的MMC子模块电压波动抑制方法
作者:
作者单位:

1.新能源电力系统国家重点实验室(华北电力大学),北京市 102206;2.北京市直流输配电工程技术研究中心(中电普瑞电力工程有限公司),北京市 102200

作者简介:

李钰(1995—),男,硕士研究生,主要研究方向:柔性直流输电。E-mail:tianbao5911@126.com
陆锋(1994—),男,硕士研究生,主要研究方向:柔性直流输电。E-mail:13261475387@163.com
许建中(1987—),男,通信作者,博士,副教授,主要研究方向:直流输电与FACTS。E-mail:xujianzhong2005@163.com(编辑 施冬敏)

通讯作者:

基金项目:

国家电网公司科技项目(52130A180002)。


Suppression Method for Voltage Fluctuation of Sub-module in Multilevel Modular Converter with Unbalanced Power Grid Voltage
Author:
Affiliation:

1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources;(North China Electric Power University), Beijing 102206, China;2.Beijing DC Transmission and Distribution Engineering Technology Research Center;(C-EPRI Electric Power Engineering Co., Ltd.), Beijing 102200, China

Fund Project:

This work is supported by State Grid Corporation of China (No. 52130A180002).

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    摘要:

    为降低模块化多电平换流器(MMC)对子模块电容的需求,有必要抑制子模块的电容电压波动。电网三相电压不平衡情况发生时,会加剧MMC中子模块的电容电压波动。首先分析了电网电压不平衡时MMC子模块电容电压的波动特性,进一步分析了三次谐波注入对子模块电压波动的影响;重新设计了三次谐波电压注入的幅值和相角,使其能在不平衡工况下有效实现降低电压波动的目标;设计了相应的波动抑制策略;最后,在PSCAD/EMTDC平台上进行仿真,验证了所提注入方案的有效性。

    Abstract:

    The voltage fluctuation of the sub-module in multilevel modular converter (MMC) will be aggravated with unbalanced power grid voltage. In order to reduce the MMC demand for sub-module capacitance, it is necessary to suppress the capacitor voltage fluctuation of the sub-module. Firstly, the fluctuation of capacitor voltage of MMC sub-module with unbalanced power grid voltage and the influence of third harmonic injection on sub-module voltage fluctuation are analyzed. The amplitude and the phase angle of third harmonic injection with unbalanced power grid voltage are calculated. The modulation voltage peak could be minimized by injecting the designed third harmonic voltage. The fluctuation suppression strategy is designed. Finally, the validity of the proposed strategy is verified by simulating the double-ended hybrid MMC in PSCAD/EMTDC.

    图1 MMC拓扑结构Fig.1 Topology of MMC
    图2 MMC正负序控制环节Fig.2 Positive and negative sequence control of MMC
    图3 桥臂调制电压波形Fig.3 Modulation voltage waveform of bridge arm
    图4 三次谐波注入控制策略结构Fig.4 Control strategy structure of third
    图5 三次谐波注入前后a相电容电压Fig.5 Capacitor voltage of a-phase before and after third harmonic injection
    图6 三次谐波注入前后b相电容电压Fig.6 Capacitor voltage of b-phase before and after third harmonic injection
    图7 三次谐波注入前后c相电容电压Fig.7 Capacitor voltage of c-phase before and after third harmonic injection
    图 阀侧交流电压Fig. AC voltage of converter side
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引用本文

李钰,陆锋,樊强,等.不平衡电网电压下的MMC子模块电压波动抑制方法[J].电力系统自动化,2020,44(4):91-100. DOI:10.7500/AEPS20190304003.
LI Yu,LU Feng,FAN Qiang,et al.Suppression Method for Voltage Fluctuation of Sub-module in Multilevel Modular Converter with Unbalanced Power Grid Voltage[J].Automation of Electric Power Systems,2020,44(4):91-100. DOI:10.7500/AEPS20190304003.

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历史
  • 收稿日期:2019-03-04
  • 最后修改日期:2019-07-03
  • 录用日期:2019-07-16
  • 在线发布日期: 2020-02-16
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