柔性直流配电网接地方式对故障特性的影响分析

发布时间：2018-04-23 11:45

本文选题：柔性直流配电网 + 接地方式　；参考：《电网技术》2017年07期

【摘要】：采用理论分析和仿真验证相结合的方法研究了柔性直流配电系统接地方式对其故障特性的影响。首先,介绍了柔性直流配电网的系统架构,确定了直流侧电容的接地方式;其次,分析了直流不平衡电压恢复的理论依据;接着讨论了联接变压器的接地方式对换流器交流侧不同位置单相故障的影响;随后分析了联接变压器接地方式对直流侧单极接地故障的影响,并讨论了不同过渡电阻情况下的故障特性。与电压源型直流输电技术(voltage-sourced converter high-voltage direct current,VSC-HVDC)分析故障特性方法不同,为提高配网供电可靠性,在分析直流侧单极接地故障时,考虑了绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)不闭锁的情况。最后讨论了在实际应用中实现IGBT运行在不闭锁状态下的方法。分析结果表明,接地方式对系统的故障过程和故障恢复过程有显著影响。分析方法和结论为柔性直流配网的接地方式选取、保护方案配置提供了参考。
[Abstract]:The influence of grounding mode on the fault characteristics of flexible DC distribution system is studied by means of theoretical analysis and simulation verification. Firstly, the system architecture of flexible DC distribution network is introduced, and the grounding mode of DC side capacitance is determined. Secondly, the theoretical basis of DC unbalanced voltage recovery is analyzed. Then the influence of the grounding mode of the connection transformer on the single-phase fault of the AC side of the converter is discussed, and the influence of the grounding mode of the connection transformer on the single-pole grounding fault of the DC side is analyzed. The fault characteristics of different transition resistance are discussed. Different from Voltage-sourced converter high-voltage direct VSC-HVDC, in order to improve the reliability of power supply, the insulated gate bipolar transistors (IGBT) with insulated gate bipolar transistors are considered in order to improve the reliability of power supply. Finally, the method of realizing IGBT running without locking in practical application is discussed. The results show that the grounding mode has a significant impact on the fault process and fault recovery process of the system. The analysis methods and conclusions provide a reference for the selection of the grounding mode and the configuration of the protection scheme for the flexible DC distribution network.
【作者单位】：河北省分布式储能与微网重点实验室(华北电力大学);国网保定供电公司发展策划部;
【基金】：国家重点研发计划专项课题(2016YFB0900203) 国家自然科学基金项目(51307059) 河北省自然科学基金项目(E2014502065)~~
【分类号】：TM721.1

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