利用直流断路器实现柔直换流器直流侧在线并网

doi:10.11930/j.issn.1004-9649.201909066

中国电力 ›› 2020, Vol. 53 ›› Issue (6): 81-86,96.DOI: 10.11930/j.issn.1004-9649.201909066

利用直流断路器实现柔直换流器直流侧在线并网

苑宾, 梅念, 乐波, 李探, 魏争

国网经济技术研究院有限公司，北京 102209

收稿日期:2019-09-10 修回日期:2020-02-25 发布日期:2020-06-05
作者简介:苑宾(1988-),男,通信作者,博士,从事柔性直流输电控制及保护策略相关研究,E-mail:yuanbingemini@126.com;梅念(1982-),女,博士,从事柔性直流输电控制及保护策略相关研究,E-mail:meinn@126.com
基金资助:
国家电网公司科技项目(大容量柔性直流电网成套设计核心技术研发及成套设计平台构建，52010118000B)

The Online Connection of MMC to DC-grid Based on DC Breaker

YUAN Bin, MEI Nian, YUE Bo, LI Tan, WEI Zheng

State Grid Economic and Technological Research Institute Co. Ltd., Beijing 102209, China

Received:2019-09-10 Revised:2020-02-25 Published:2020-06-05
Supported by:
This work is supported by Science and Technology Project of State Grid Corporation of China(Packaged Design and Key Technology Research of MMC-HVDC Grid and Setting up of the Design Platform, No.52010118000B)

摘要/Abstract

摘要： 高压大容量柔性直流电网中换流器的快速可靠在线并网是目前工程中亟须解决的问题之一。由于孤岛换流站不具备交流侧启动能力，需要通过直流侧启动实现换流器并网。为了限制直流侧充电电流，可利用直流断路器对换流器进行预充电。研究通过直流断路器分级合闸实现孤岛换流站在线并网的可行性，提出分级合闸过程中直流断路器电流应力以及避雷器能量的计算方法，并通过该计算方法对张北工程直流断路器的电气应力进行计算。在PSCAD/EMTDC仿真环境中建立了张北柔性直流电网模型并进行了仿真测试，验证了其在直流电网中的适用性，通过仿真结果证明了计算方法的准确性。

关键词: 模块化多电平换流器, 直流断路器, 在线并网, 分级合闸, 避雷器能量

Abstract: The fast and reliable online connection of modular multilevel converter (MMC) to DC grid is one of the problems needing to be solved urgently in practice. Since the islanded converter station cannot be started up by AC grid, it is necessary to start up the converter by the DC grid and realize its connection to the grid. In order to limit the charging current at the DC side, the DC breaker can be used to pre-charge the converter. The feasibility is studied to use step by step switching on of DC breaker to realize the online connection of islanded converter station. An innovative calculation method is also proposed to calculate the current stress of DC breaker and the MOV energy in the process of step by step switching on, and is applied to the calculation of the electrical stress of DC breaker in Zhangbei DC project. The Zhangbei flexible DC grid project is modelled and simulated based on PSCAD/EMTDC, and the results validate the applicability in DC grid of the proposed online DC grid connection method and the correctness of the proposed calculation method.

Key words: modular multilevel converter, DC breaker, online connection, step by step switching on, MOV energy

苑宾, 梅念, 乐波, 李探, 魏争. 利用直流断路器实现柔直换流器直流侧在线并网[J]. 中国电力, 2020, 53(6): 81-86,96.

YUAN Bin, MEI Nian, YUE Bo, LI Tan, WEI Zheng. The Online Connection of MMC to DC-grid Based on DC Breaker[J]. Electric Power, 2020, 53(6): 81-86,96.

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利用直流断路器实现柔直换流器直流侧在线并网

The Online Connection of MMC to DC-grid Based on DC Breaker

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利用直流断路器实现柔直换流器直流侧在线并网

The Online Connection of MMC to DC-grid Based on DC Breaker

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