基于RTDS的配电网单相接地选线方法验证

The verification based on RTDS of fault line selection method for distribution power system

针对配电网单相接地选线方法缺乏系统验证的现况,本文阐述了基于RTDS实时仿真平台的试验研究方法。在RTDS中依据配电网实际数据建立仿真模型,模拟典型的单相接地故障并将仿真系统的模拟信号输出,通过自动化装置构成系统性的闭环试验环境。改进了群体比幅比相法的3C方案,对选线方案中故障分量较小的"时针效应",改进了测量算法和判线逻辑两个方面,有效提高了小信号的测量精度和故障判断冗余性。实验对架空出线金属性单相接地、电缆出线经过渡电阻单相接地这两种故障进行了模拟试验。测试结果表明,此试验方法切实可行,验证了选线方法的准确性和实用性。

The current situation of system verification for the single-phase grounding of distribution network is lacking, it puts forward a test and research method based on RTDS. A systemic closed-loop experimental enviroment consists of simulation models and automatic equipment, and the simulation models are built on the actual data of RTDS. This paper improves the 3C scheme of amplitude and phase comparison and the ＂ hour hand effect＂ when the fault component is small in the line selection scheme, and improves the measurement precision and the measurement precision of the small signal Redundancy of fault judgment. Two kinds of faults, single-phase grounding and cable-out of single-phase earthing are studied. Through many types of tests, the test methods are proved feasible, and the algorithm of fault line selection are also proved exact and practical.