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.
出处
《电力系统自动化》
EI
CSCD
北大核心
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)~~
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
proportional-resonant（PR）control
proportional-integral（PI）control
single-phase grounding fault
arc suppression
double closed-loop control
