环形直流微网短路故障分析及保护方法
发布时间:2018-08-16 17:21
【摘要】:以环形风电直流微网为研究对象,深入分析直流母线发生双极短路故障时电压源变流器(VSC)的故障特性,并据此提出以电流差动保护为主保护、欠电压保护为后备保护的环形直流微网故障定位与保护方案。该方案通过检测直流线路的输入、输出电流及其差动电流来定位和隔离故障线路,并配备欠电压后备保护以确保故障下直流微网系统的安全运行。基于MATLAB/Simulink对环形直流微网进行仿真研究以验证所提保护策略的可行性。仿真结果表明,在线路发生双极短路故障时,保护系统能够根据线路差动电流值做出快速响应,从而实现了直流微网系统短路故障的定位和隔离。
[Abstract]:In this paper, the fault characteristics of voltage source converter (VSC) in the case of bipolar short-circuit fault of DC bus are analyzed in detail, and a fault location and protection scheme for DC microgrid with current differential protection as the main protection and under-voltage protection as the backup protection is proposed. Input and output currents and their differential currents are used to locate and isolate faulty lines, and under-voltage backup protection is provided to ensure the safe operation of DC microgrid system under faults. A simulation study is carried out based on MATLAB/Simulink to verify the feasibility of the proposed protection strategy. When the fault occurs, the protection system can respond quickly according to the differential current value of the line, thus realizing the location and isolation of short-circuit faults in the DC microgrid system.
【作者单位】: 华北电力大学新能源电力系统国家重点实验室;
【基金】:国家高技术研究发展计划(863计划)资助项目(2015AA050101)~~
【分类号】:TM711
[Abstract]:In this paper, the fault characteristics of voltage source converter (VSC) in the case of bipolar short-circuit fault of DC bus are analyzed in detail, and a fault location and protection scheme for DC microgrid with current differential protection as the main protection and under-voltage protection as the backup protection is proposed. Input and output currents and their differential currents are used to locate and isolate faulty lines, and under-voltage backup protection is provided to ensure the safe operation of DC microgrid system under faults. A simulation study is carried out based on MATLAB/Simulink to verify the feasibility of the proposed protection strategy. When the fault occurs, the protection system can respond quickly according to the differential current value of the line, thus realizing the location and isolation of short-circuit faults in the DC microgrid system.
【作者单位】: 华北电力大学新能源电力系统国家重点实验室;
【基金】:国家高技术研究发展计划(863计划)资助项目(2015AA050101)~~
【分类号】:TM711
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