直流系统保护对交流故障的响应机理与交流故障引发的直流系统保护误动分析

发布时间：2019-01-15 07:32

【摘要】：针对交直流混联系统中直流保护在交流系统故障时误动的问题,基于某特高压直流系统的数字实时仿真系统(RTDS),研究交流故障下直流系统的暂态响应特征。从交流故障与直流故障的相似性、直流保护原理和整定方法的不完善性两方面揭示了直流保护对交流故障的响应机理。基于直流保护对交流故障的响应机理,全面梳理出在原理上能反映交流故障的直流保护类型。结合某特高压直流系统的RTDS实验数据,详细分析了两侧交流系统故障时的低电压特征以及电流失衡特征所引发的直流保护误动情况。深入分析了交流故障下直流低电压保护、阀组差动保护以及桥差保护的误动机理,并提出相应的改进建议,为直流工程的更合理运行提供指导。
[Abstract]:Aiming at the maloperation of DC protection in AC / DC hybrid system, the transient response characteristics of DC system under AC / DC fault are studied based on the digital real-time simulation system (RTDS),) of an UHVDC system. The response mechanism of DC protection to AC fault is revealed from the similarity between AC fault and DC fault and the imperfection of DC protection principle and setting method. Based on the response mechanism of DC protection to AC fault, the types of DC protection which can reflect AC fault in principle are sorted out. Based on the RTDS experimental data of an UHVDC system, the characteristics of low voltage and the misoperation of DC protection caused by the characteristic of current imbalance are analyzed in detail. This paper deeply analyzes the malfunction of DC low-voltage protection, valve group differential protection and bridge differential protection under AC fault, and puts forward corresponding suggestions for improvement, which provides guidance for more rational operation of DC engineering.
【作者单位】：华南理工大学电力学院;中国南方电网超高压输电公司;
【基金】：国家高技术研究发展计划(863计划)(2012AA050209) 国家自然科学基金项目(51377059)~~
【分类号】：TM721

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