磁控式并联电抗器控制绕组匝间故障分析及保护方案

发布时间：2018-03-02 03:14

本文关键词： 磁控式并联电抗器控制绕组匝间故障电抗器保护过电压保护　出处：《电力系统自动化》2014年10期 　论文类型：期刊论文

【摘要】：基于实际工程介绍了一种超高压磁控式并联电抗器的励磁系统构成,分析了控制绕组匝间短路的故障特征。结合MATLAB数字仿真和动模实验结果,提出了以过电压保护作为控制绕组匝间保护方案存在延时动作且可能拒动的潜在问题,分析其原因在于故障时直流母线极间电压中的故障特征只含有间断的电压尖峰而非连续的交流过电压,且在某些情况下完全不显示故障特征。建立了故障后励磁系统的电流分布模型,得出故障后直流母线极间电压中故障特征的出现依赖于总控制电流过零的结论。提出以总控制电流中的基波分量作为判据的控制绕组匝间保护新方案,该方案在小匝间故障时仍具有很高的灵敏度,结合仿真结果论证了新方案的有效性。
[Abstract]:Based on practical engineering, the excitation system of an ultra-high voltage magnetically controlled parallel reactor is introduced, and the fault characteristics of inter-turn short circuit of control windings are analyzed. Combined with the results of MATLAB digital simulation and dynamic simulation experiment, In this paper, the potential problem of overvoltage protection as control winding inter-turn protection scheme with delay action and possible rejection is put forward. The reason is that the fault characteristic of DC bus voltage only contains the intermittent voltage spike instead of the continuous AC overvoltage. The current distribution model of the post-fault excitation system is established. It is concluded that the occurrence of fault characteristics in DC busbar inter-pole voltage depends on the zero crossing of the total control current. A new scheme of control winding inter-turn protection is proposed, in which the fundamental component of the total control current is taken as the criterion. The scheme still has high sensitivity in the case of small turn fault, and the effectiveness of the new scheme is demonstrated by the simulation results.
【作者单位】：新能源电力系统国家重点实验室华北电力大学;中电普瑞科技有限公司;国网智能电网研究院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA050208) 国家电网公司科技项目(SGRI-PK-71-13001) 中央高校基本科研业务费专项资金资助项目(2014MS06)~~
【分类号】：TM472

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