适应线路参数及负载变化的配电网柔性优化消弧方法

发布时间：2018-09-14 18:57

【摘要】：中性点非有效接地配电网长期存在单相接地故障消弧难题,在分析线路参数及负载对已有消弧方法的影响以及已有消弧方法优缺点的基础上,提出一种配电网单相接地故障柔性优化消弧方法。故障发生后,通过级联H桥变流器向配电网注入接地故障补偿电流,并根据母线处零序电压确定接地过渡电阻大小。接地电阻较大时,判断注入补偿电流后母线处三相电压变化趋势,选出故障相,根据故障选相结果调整变流器注入电流,控制母线处故障相电压为零,即采用电压消弧方法,否则继续注入接地故障补偿电流,即采用电流消弧方法。仿真结果表明所提方法能够有效抑制接地电弧重燃,解决了单一电流消弧方法和电压消弧方法因线路参数和负载影响而存在的不足。
[Abstract]:The arc suppression problem of single-phase grounding fault exists for a long time in the neutral point non-effective grounding distribution network. Based on the analysis of the influence of line parameters and load on the existing arc suppression methods and the advantages and disadvantages of the existing arc suppression methods. A flexible optimal arc suppression method for single phase grounding fault in distribution network is proposed. After the fault occurs, the compensation current of the grounding fault is injected into the distribution network by cascaded H-bridge converter, and the magnitude of the grounding transition resistance is determined according to the zero-sequence voltage at the bus. When the grounding resistance is large, the change trend of three-phase voltage at the bus after injecting compensation current is judged, the fault phase is selected, the injection current of converter is adjusted according to the result of fault phase selection, and the voltage of fault phase is controlled to zero, that is, the method of voltage arc suppression is adopted. Otherwise, continue to inject grounding fault compensation current, that is, current arc suppression method. The simulation results show that the proposed method can effectively suppress the reburning of grounding arc and solve the shortcomings of single current arc suppression method and voltage arc suppression method due to the influence of line parameters and load.
【作者单位】：福州大学电气工程与自动化学院;国网福建省电力有限公司漳州供电公司;
【基金】：国家自然科学基金资助项目(51677030) 福建省自然科学基金资助项目(2016J01218)~~
【分类号】：TM862

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