MMC-UPFC不同接地设计的故障特性及对本体保护配置影响

发布时间：2018-04-03 08:23

本文选题：统一潮流控制器　切入点：模块化多电平换流器　出处：《电力自动化设备》2017年05期

【摘要】：根据MMC-UPFC示范工程的实际需要,提出3种可行的交流侧接地方式:仅并联变阀侧中性点经大电阻接地、仅串联变阀侧中性点经大电阻接地及仅并联变阀侧中性点经小电阻接地。结合示范工程系统参数与实时数字仿真(RTDS)实验,详细分析了不同接地方式对故障特性与保护配置的影响,重点讨论接地点位置对串联变网侧单相接地故障及对应保护配置影响,以及接地电阻阻值对阀侧短引线单相接地故障、换流器桥臂单相接地故障及相应保护配置影响。最终得出仅并联变阀侧中性点经大电阻接地为较优的MMC-UPFC接地方案。
[Abstract]:According to the practical needs of MMC-UPFC demonstration project, three feasible ways of AC side grounding are put forward: only the neutral point of the side of the parallel variable valve is grounded by large resistance, only the neutral point of the side of the series variable valve is grounded by the large resistance, and only the neutral point of the side of the parallel variable valve is grounded by the small resistance.Based on the experiments of demonstration engineering system parameters and RTDS, the effects of different grounding modes on fault characteristics and protection configuration are analyzed in detail, and the effects of grounding point location on single-phase grounding faults and corresponding protection configurations in series transformer grid are discussed.The influence of grounding resistance on the single-phase grounding fault of the valve side short lead and the single-phase earthing fault of the bridge arm of converter and the corresponding protection configuration are also discussed.Finally, the MMC-UPFC grounding scheme with only neutral point on the side of the parallel variable valve is obtained, which is grounded by large resistance.
【作者单位】：华北电力大学新能源电力系统国家重点实验室;国网智能电网研究院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2012CB215200)~~
【分类号】：TM721.2;TM862

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