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考虑MMC主动限流控制的直流短路电流计算方法
作者:
作者单位:

1.国网冀北电力有限公司,北京市 100045;2.清华大学电机工程与应用电子技术系,北京市 100084;3.国网福建省电力有限公司检修分公司,福建省福州市 350013

摘要:

为了保证模块化多电平换流器(MMC)不闭锁退出运行,需要限制直流短路电流的上升速度。MMC的主动限流控制能够通过减少电容放电时间实现短路电流的限制,并且不产生额外成本,是一种新型限流方案。目前的直流短路电流计算方法无法体现MMC主动限流控制带来的故障电路结构和参数变化。文中提出一种考虑MMC主动限流控制的直流短路电流计算方法。通过引入电容放电状态占空比参数来体现主动限流控制对直流短路电流的影响,基于状态空间平均法建立直流短路电流的状态方程,给出直流短路电流的时域解析表达式。基于PSCAD/EMTDC仿真平台验证了所提计算方法的有效性。

关键词:

基金项目:

国家自然科学基金资助项目(51807105);国家电网公司科技项目“张家口可再生能源示范区重大科技示范工程运维关键技术研究”(52018K170028);台达电力电子科教发展计划资助项目(DREG2018007)。

通信作者:

作者简介:

龙凯华(1984—),男,硕士,高级工程师,主要研究方向:高电压技术与试验。
李笑倩(1987—),女,通信作者,博士,助理研究员,主要研究方向:柔性输配电技术和大功率电力电子技术。E-mail: lixq-dee@tsinghua.edu.cn
李子明(1996—),男,博士研究生,主要研究方向:柔性输配电技术和大功率电力电子技术。


Calculation Method of DC Short-circuit Current Considering Active Current-limiting Control of Modular Multilevel Converter
Author:
Affiliation:

1.State Grid Jibei Electric Power Co., Ltd., Beijing 100045, China;2.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;3.Maintenance Branch Company of State Grid Fujian Electric Power Co., Ltd., Fuzhou 350013, China

Abstract:

In order to prevent the trip of modular multilevel converter (MMC) due to block, the rising speed of DC short-circuit current should be limited. The active current-limiting control of MMC is a new current-limiting method, which can limit the DC short-circuit current by reducing the discharging time of capacitor without extra cost. The existing calculation method of DC short-circuit current cannot reflect the change of circuit structures and parameters caused by active current-limiting control. This paper proposes a calculation method of DC short-circuit current considering active current-limiting control of MMC. A duty circle index for discharging state of capacitor is introduced to represent the effect of active current-limiting control on DC short-circuit current. The state equation of DC short-circuit current is built based on state space averaging method, and the time-domain analytical expression of DC short-circuit current is given. The effectiveness of the proposed calculation method is validated by the simulation results based on PSCAD/EMTDC.

Keywords:

Foundation:
This work is supported by National Natural Science Foundation of China (No. 51807105), State Grid Corporation of China (No. 52018K170028), and Power Electronics Science and Education Development Program of Delta Group (No. DREG2018007).
引用本文
[1]龙凯华,李笑倩,李子明,等.考虑MMC主动限流控制的直流短路电流计算方法[J].电力系统自动化,2020,44(5):84-90. DOI:10.7500/AEPS20190408013.
LONG Kaihua, LI Xiaoqian, LI Ziming, et al. Calculation Method of DC Short-circuit Current Considering Active Current-limiting Control of Modular Multilevel Converter[J]. Automation of Electric Power Systems, 2020, 44(5):84-90. DOI:10.7500/AEPS20190408013.
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  • 收稿日期:2019-04-08
  • 最后修改日期:2019-07-29
  • 录用日期:
  • 在线发布日期: 2020-03-08
  • 出版日期:
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