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
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。
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)
1. Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, China;2. Hunan Province Key Laboratory of Smart Grids Operation and Control(Changsha University of Science and Technology), Changsha 410004, China
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 a proportional-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 inner-loop 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.
[1] | 陈锐,周丰,翁洪杰,等.基于双闭环控制的配电网单相接地故障有源消弧方法[J].电力系统自动化,2017,41(5):128-133. DOI:10.7500/AEPS20160418003. CHEN Rui, ZHOU Feng, WENG Hongjie, et al. Active Arc-suppression Method Based on Double Closed-loop Control Under Single-phase Grounding Faults in Distribution Networks[J]. Automation of Electric Power Systems, 2017, 41(5):128-133. DOI:10.7500/AEPS20160418003. |