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具有直流故障清除能力的主动接地式模块化多电平换流器
作者:
作者单位:

1.现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市 132012;2.广东电网有限责任公司韶关供电局,广东省韶关市 512026

作者简介:

王振浩(1964—),男,教授,硕士生导师,主要研究方向:输变电设备运行状态监测与诊断、柔性直流输电技术等。E-mail:zhenhaowang@126.com
赵家婧(1995—),女,硕士研究生,主要研究方向:柔性直流输电技术。E-mail:719148894@qq.com
成龙(1988—),男,通信作者,博士研究生,助理实验师,主要研究方向:交直流配电系统建模及运行控制、柔性直流输配电技术等。E-mail:chl@neepu.edu.cn

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904600)。


Active-grounded Modular Multilevel Converter with DC Fault Clearing Capability
Author:
Affiliation:

1.Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University), Jilin 132012, China;2.Shaoguan Power Supply Bureau, Guangdong Power Grid Co., Ltd., Shaoguan 512026, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904600).

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    摘要:

    针对传统半桥型模块化多电平换流器(MMC)无法阻遏故障电流,以及现有具备故障清除能力的MMC故障清除时间过长的问题,提出一种具有直流故障清除能力的主动接地式MMC拓扑。在传统半桥型MMC基础上,在换流器各相上、下桥臂电感外侧增加电流转移支路,在换流器直流出口增加断流支路和能量吸收支路。当MMC直流侧发生双极短路时,断流支路能够有效地隔离断路器和直流线路,电流转移支路能够消耗交流电流和电感电流,能量吸收支路能够快速清除故障电流。文中对主动接地式MMC的拓扑结构及其实现故障隔离和清除的过程进行详细分析,给出了关键参数的设计和计算方法,并利用RT-LAB OP5607软件搭建双端和四端MMC仿真模型,对比分析可知,所提出的主动接地式MMC能够在十几毫秒内清除故障,在经济性和实用性方面具有很大的优势。

    Abstract:

    In view of the fact that the conventional semi-bridge modular multilevel converter (MMC) cannot block the fault current, and the existing MMC with the fault clearing capability takes too long to clear the fault, an active-grounded MMC (AG-MMC) topology with DC fault clearing capability is proposed. On the basis of conventional semi-bridge MMC, a current transfer branch is added outside the inductors on the upper and lower bridge arms of each phase of the converter, and a cut-off branch and an energy absorption branch are added at the DC outlet of the converter. When a bipolar short circuit occurs on the DC side of the MMC, the cut-off branch can effectively isolate the circuit breaker and the DC line. The current transfer branch can consume AC current and inductor current, and the energy absorption branch can quickly clear the fault current. The topology of AG-MMC and the process of fault isolation and clearing are analyzed in detail, and the design and calculation method of key parameters are given. Finally, the two-terminal MMC and four-terminal MMC simulation systems are built by using RT-LAB OP5607 software. Comparative analysis shows that the proposed AG-MMC can clear faults within ten milliseconds, which has great advantages in terms of economy and practicality.

    表 1 同一条件下4种MMC方案所需器件数对比Table 1 Comparison of device quantities required for four MMC schemes under the same condition
    图1 AG-MMC拓扑结构Fig.1 Topology of AG-MMC
    图1 AG-MMC拓扑结构Fig.1 Topology of AG-MMC
    图2 直流侧发生故障后AG-MMC的电流回路Fig.2 Current loop of AG-MMC after DC-side fault
    图3 上下桥臂电流回路Fig.3 Current loop of upper and lower bridge arms
    图4 四端系统的电压、电流波形1Fig.4 Voltage and current waveform 1 of four-terminal system
    图5 四端系统的电压、电流波形2Fig.5 Voltage and current waveform 2 of four-terminal system
    图 能量吸收支路电流回路Fig. Current access of energy absorption branch
    图 桥臂电感电流回路Fig. Inductive current access of bridge arms
    图 能量吸收支路电流回路Fig. Current access of energy absorption branch
    图 双端MMC-HVDC仿真结构Fig. Dual MMC-HVDC simulation structure
    图 双端系统的电压、电流波形1Fig. Voltage and current waveform 1 of two-terminal system
    图 双端系统的电压、电流波形2Fig. Voltage and current waveform 2 of two-terminal system
    图 双端系统的电压、电流波形3Fig. Voltage and current waveform 3 of two-terminal system
    图 多端MMC-HVDC仿真结构Fig. Multi-end MMC-HVDC simulation structure
    图 IDCB-MMC拓扑结构Fig. IDCB-MMC topology
    图 CT-MMC拓扑结构Fig. CT-MMC topology
    图 三种方案故障清除速度对比Fig. Fault clearance speed comparison of three schemes附录B
    表 4 Table 4
    表 3 Table 3
    表 2 4种MMC方案损耗特性对比Table 2 Comparison of loss characteristics for four MMC schemes
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引用本文

王振浩,赵家婧,成龙,等.具有直流故障清除能力的主动接地式模块化多电平换流器[J].电力系统自动化,2020,44(7):145-152. DOI:10.7500/AEPS20190619009.
WANG Zhenhao,ZHAO Jiajing,CHENG Long,et al.Active-grounded Modular Multilevel Converter with DC Fault Clearing Capability[J].Automation of Electric Power Systems,2020,44(7):145-152. DOI:10.7500/AEPS20190619009.

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  • 收稿日期:2019-06-19
  • 最后修改日期:2019-10-08
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  • 在线发布日期: 2020-03-25
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