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适用于直流电网故障清除的增强型MMC
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.电子科技大学中山学院,广东省中山市 528400

作者简介:

赵成勇(1964—),男,教授,博士生导师,主要研究方向:高压直流输电与柔性直流输电技术。E-mail: chengyongzhao@ncepu.edu.cn
李帅(1986—),男,博士,讲师,主要研究方向:高压直流输电与柔性直流输电技术。E-mail: lishuaiwork@foxmail.com
张继元(1995—),男,硕士研究生,主要研究方向:高压直流输电与柔性直流输电技术。E-mail: zhangjiyuan1995@163.com
许建中(1987—),男,通信作者,博士,副教授,主要研究方向:高压直流输电和直流电网。E-mail: xujianzhong@ncepu.edu.cn

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904600);国家自然科学基金资助项目(51777072)。


An Augmented Modular Multilevel Converter for Clearing Fault in DC Grid
Author:
Affiliation:

1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China;2.University of Electronic Science and Technology of China, Zhongshan 528400, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904600) and National Natural Science Foundation of China (No. 51777072).

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    摘要:

    随着直流输电系统电压和容量的提高,对直流故障快速清除隔离的要求越来越高。作为清除直流故障的有效方案之一,直流断路器(DCCB)技术还不够成熟,限制了其在工程上的应用。文中提出了适用于直流电网故障清除的低成本直流故障清除方案,对半桥型模块化多电平换流器(MMC)进行了局部的改造,以使其具备故障清除操作的能力,使得线路上的故障电流能够被低成本故障隔离单元迅速隔离,随后建立和分析了故障隔离过程中的等效电路,设计了故障隔离动作时序,并对比分析了典型方案的器件使用量,最后建立了仿真和实验模型。仿真和实验结果证明了该方案的有效性。

    Abstract:

    With the increase of voltage and capacity of high voltage direct current (HVDC) system, the requirement for rapid clearance and isolation of DC faults is getting higher and higher. As the most effective solution, hybrid DC circuit breaker is not mature enough, which restricts its engineering application. Accordingly, this paper proposes a low-cost DC fault clearance scheme suitable for clearing fault in DC grid. In this scheme, the traditional half-bridge modular multilevel converter (MMC) is partially innovated to have the ability of auxiliary breaking operation. With the effect of the MMC auxiliary breaking operation at both ends of the fault line, the DC fault current can be quickly interrupted and isolated by low-cost circuit breaker unit installed in the DC transmission line. The equivalent circuit in the fault isolation process is modelled and analyzed, and the fault isolation sequence is designed. Furthermore, the comparative analysis of devices usage among typical schemes is performed. Finally, a simulation model with the proposed scheme is built, and an MMC prototype is developed. The simulation and experimental results validate the effectiveness of the proposed scheme.

    表 1 Table 1
    图1 增强型MMC方案结构Fig.1 Structure of augmented MMC scheme
    图2 故障清除过程Fig.2 Process of fault clearance
    图3 故障隔离过程Fig.3 Fault isolation process
    图4 所提方案与混合式DCCB方案对比Fig.4 Comparison between the proposed scheme and hybrid DCCB scheme
    图5 正常运行阶段的等效电路Fig.5 Equivalent circuit in the normal operation
    图6 故障发生瞬间的等效电路Fig.6 Equivalent circuit at the moment of fault occurrence
    图7 故障清除阶段的等效电路Fig.7 Equivalent circuit in the fault clearance stage
    图8 能量耗散阶段的等效电路Fig.8 Equivalent circuit in the energy dissipation stage
    图 四端双极直流电网仿真模型Fig. Simulation model of four-terminal bipolar DC grid
    图 正常运行时MMC1_1动态响应波形图:(a)有功功率;(b)直流电压Fig. Dynamic response diagram of MMC1_1 under normal state: (a) active power; (b) DC voltage
    图 直流故障穿越过程:(a)故障线路UFD电流波形图;(b)故障清除过程中换流器两端电压;(c) 故障清除过程中的各桥臂电流波形图;(d)换流器子模块电容电压波形图Fig. DC fault isolation process: (a) fault line current; (b) DC voltage; (c) arm current of MMC; (d) SMs’ capacitor voltage
    图 硬件实验接线图Fig. Wiring diagram of the prototype
    表 2 Table 2
    图 硬件平台实物图Fig. Practicality picture of the prototype
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引用本文

赵成勇,李帅,张继元,等.适用于直流电网故障清除的增强型MMC[J].电力系统自动化,2020,44(5):60-67. DOI:10.7500/AEPS20190128005.
ZHAO Chengyong,LI Shuai,ZHANG Jiyuan,et al.An Augmented Modular Multilevel Converter for Clearing Fault in DC Grid[J].Automation of Electric Power Systems,2020,44(5):60-67. DOI:10.7500/AEPS20190128005.

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  • 收稿日期:2019-01-28
  • 最后修改日期:2019-06-30
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  • 在线发布日期: 2020-03-08
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