电气工程学报 ›› 2020, Vol. 15 ›› Issue (4): 65-74.doi: 10.11985/2020.04.008

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基于混合型柔性限流器直流配网故障暂态特性研究 *

李清波1(), 林佳壕2()   

  1. 1.广东电网有限责任公司汕头供电局 汕头 515000
    2.福州大学电气工程与自动化学院 福州 350108
  • 收稿日期:2020-08-20 修回日期:2020-09-20 出版日期:2020-12-25 发布日期:2020-12-25
  • 通讯作者: 林佳壕 E-mail:1390273955@139.com;jh_fd5678@163.com
  • 作者简介:林佳壕,男,1997年生,硕士研究生。主要研究方向为直流配电网故障分析与限流策略。E-mail: jh_fd5678@163.com
    李清波,男,1969年生,高级工程师。主要研究方向为柔性直流技术应用及电力系统技术管理。E-mail: 1390273955@139.com
  • 基金资助:
    * 国家重点研发计划资助项目(2017YFB0902300)

Study on Fault Transient Characteristics of DC Distribution Network Based on Hybrid Flexible Current Limiter

LI Qingbo1(), LIN Jiahao2()   

  1. 1. Shantou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Shantou 515000
    2. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108
  • Received:2020-08-20 Revised:2020-09-20 Online:2020-12-25 Published:2020-12-25
  • Contact: LIN Jiahao E-mail:1390273955@139.com;jh_fd5678@163.com

摘要:

针对直流配电网极间短路故障,提出一种基于桥型电路的混合型柔性限流策略。限流装置由超导限流器和整流器控制的自激式限流器构成。系统正常运行时,桥型电路通过二极管电流关系将中间支路旁路,限流装置不接入系统,不影响系统运行状态。系统出现极间短路故障时,桥型电路的桥臂电流发生变化,自然换路将限流装置接入系统。通过电阻型超导失超,增加故障回路中的阻值大小;自激式限流器中的限流电感在故障回路中形成反向的钳位电压,减小放电回路的电压。并通过控制回路改变受控电感的钳位电压,实现对故障电流大小的柔性控制。最后,通过Matlab/Simulink仿真平台搭建配电网模型,验证文中所提限流策略的可行性和有效性。

关键词: 直流配电网, 极间短路故障, 电阻型超导, 自激式限流器

Abstract:

A hybrid flexible current limiting strategy based on bridge is proposed for the short circuit between poles in DC distribution network. The current limiter consists of a superconducting current limiter and a self-excited current limiter controlled by a rectifier. When the system operates normally, the bridge circuit bypasses the current limiting device of the middle branch, so the current limiting device has no effect on the operation of the system. When there is a short circuit between the poles in the system, the bridge type circuit will naturally switch the current limiting device into the system. The superconductivity increases the resistance value in the fault circuit. While the current limiting inductance in the self-excited current limiter forms a reverse clamping voltage in the fault circuit, which reduces the voltage in the discharge circuit. The clamping voltage can be changed in the control circuit to control the fault current. Finally, through the Matlab/Simulink simulation platform, the distribution network model is built to verify the feasibility and effectiveness of the proposed current limiting strategy.

Key words: DC distribution network, short circuit fault between poles, resistance type superconductor, self-excited current limiter

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