基于双闭环控制的配电网单相接地故障有源消弧方法  

Active Arc-suppression Method Based on Double Closed-loop Control Under Single-phase Grounding Faults in Distribution Networks

作　　者：陈锐 周丰[2] 翁洪杰 王文[2] 曾祥君[2] 

机构地区：[1]广东电网有限责任公司电力科学研究院,广东省广州市510080 [2]智能电网运行与控制湖南省重点实验室(长沙理工大学),湖南省长沙市410004

出　　处：《电力系统自动化》2017年第5期128-133,共6页Automation of Electric Power Systems

基　　金：国家杰出青年科学基金资助项目(5142500269);国家自然科学基金资助项目(51407014)~~

摘　　要：阐述了配电网单相接地故障有源消弧机理,提出了一种基于双闭环控制的有源消弧方法,在配电网发生故障时,通过向中性点注入可控零序电流,控制故障相电压为零,实现故障消弧。该方法由中性点电压外环和输出电流内环构成,外环输出结果作为内环的参考信号,分别以比例—谐振(PR)和比例—积分(PI)作为控制器,并分析了内外环控制器的稳定性。仿真和实验结果表明该方法具有良好的稳态和动态性能,无需测量配电网电容电流等阻抗参数,能实现故障点电流的快速、高精度抑制。The active arc-suppression mechanism under single-phase grounding faults in distribution networks is described.And an active arc-suppression method based on double closed-loop control is proposed.When the single-phase grounding fault occurs,the inverter device injects zero-sequence current into the neutral point to force the faulted phase voltage to zero,and the fault arcs can thus be reliably extinguished.The control system consists of a neutral voltage outer-loop and an injecting current inner-loop using aproportional-integral（PI）controller and proportional-resonant（PR）controller each,respectively.The output of the outer-loop is used as the reference signal for the inner-loop.The stability of the outer-loop and that of the innerloop controllers are analyzed.Simulation analysis and prototype testing results show that the system has good steady-state and transient response performance,and is able to quickly and precisely suppress the fault current without measuring the impedance parameters of the distribution network.

关 键 词：比例—谐振(PR)控制 比例—积分(PI)控制 单相接地故障 消弧 双闭环控制 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM73