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基于控制与保护协同的直流配电系统单极接地故障保护策略
作者:
作者单位:

1.教育部智能电网重点实验室(天津大学),天津市 300072;2.天津市电力系统仿真控制重点实验室(天津大学), 天津市300072;3.国网江苏省电力有限公司,江苏省南京市 210000;4.国网江苏省电力有限公司电力科学研究院, 江苏省南京市 211000

作者简介:

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904700)。


Protection Strategy of Single-pole Grounding Fault in DC Distribution System Based on Cooperation of Control and Protection
Author:
Affiliation:

1.Key Laboratory of the Ministry of Education on Smart Power Grids (Tianjin University), Tianjin 300072, China;2.Tianjin Key Laboratory of Power System Simulation and Control (Tianjin University), Tianjin 300072 China;3.State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210000, China;4.Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211100, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904700).

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    摘要:

    随着电力电子技术的发展,柔性直流配电系统逐渐成为研究热点。单极接地故障是直流配电系统中最为常见的故障类型,当交流侧通过高阻接地时,直流侧发生单极接地故障后,故障电流变化不明显,难以准确定位。文中提出了基于控制与保护协同的双端直流配电系统单极接地故障保护策略,通过就地检测交流接地支路电流微分判断故障发生,进而快速投切交流接地支路上并联的小电阻,相比于传统的差动保护方法,所提方法省去了通信时间,有效提高了保护的快速性。同时,根据保护可靠性的要求,优选了并联小电阻的阻值。最后,在PSCAD/EMTDC平台中进行了仿真分析,验证了所提保护策略的可靠性和快速性。

    Abstract:

    With the development of power electronic technology, flexible DC distribution system has gradually become a research hotspot. Single-pole grounding fault is the most common fault type in DC distribution systems. When the AC side is grounded through high resistance, the changes of fault current is not obvious after the single-pole grounding fault occurs on DC side, so it is difficult to get an accurate location. Based on the cooperation of control and protection, a single-pole grounding fault protection strategy is proposed for double-terminal DC distribution system. By detecting the current differential of the AC grounding branch on the spot to judge the occurrence of the fault, and then the small resistance in parallel on the AC grounding branch can be switched on quickly. Compared with traditional differential protection methods, the proposed method saves the communication time and effectively improves the rapidity of the protection. At the same time, according to the requirements of protection reliability, the resistance value of the parallel small resistance is optimized. Finally, the simulation analysis is carried out in PSCAD/EMTDC platform to verify the reliability and rapidity of the proposed protection strategy.

    图1 双端柔性中压直流配电网拓扑结构Fig.1 Topology structure of double-terminal flexible medium voltage DC distribution network
    图2 单极接地故障后电容放电回路Fig.2 Circuit of capacitor discharging path after single-pole grounding fault occurs
    图3 方法1保护时序图Fig.3 Protection sequence diagram of method 1
    图4 方法2保护时序图Fig.4 Protection sequence diagram of method 2
    Fig. Fault location workflow of single pole to ground fault
    图 并联部分等效电路Fig. Parallel part equivalent circuit
    图 控制模块动作逻辑图Fig. Action logic of control module
    图 单极接地故障电压波形Fig. Voltage of single pole to ground fault
    图 电压不平衡保护动作电压波形Fig. Action voltage of voltage unbalance protection
    图 MMC1换流阀交流侧接地电流微分波形Fig. Differential of ground current of AC side of MMC1 converter valve
    图 接地点故障电流波形Fig. Ground point fault current
    Fig. Differential current on DC side
    图 过渡电阻对IGBT控制信号的影响Fig. Influence of transition resistance on IGBT control signal
    Fig. Influence of transition resistance on differential current of DC side
    Fig. Influence of load fluctuation on IGBT control
    Fig.
    图 并联部分误动作时直流侧电压、电流波形Fig. Voltage and current waveforms of DC side in case of misoperation of parallel part
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引用本文

王守相,王振宇,刘琪,等.基于控制与保护协同的直流配电系统单极接地故障保护策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200320004.
WANG Shouxiang,WANG Zhenyu,LIU Qi,et al.Protection Strategy of Single-pole Grounding Fault in DC Distribution System Based on Cooperation of Control and Protection[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200320004.

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  • 收稿日期:2020-03-20
  • 最后修改日期:2020-06-19
  • 录用日期:2020-05-29
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