CAJ | 학술논문

电网一次时间常数是决定非周期分量衰减快慢的因素,准确计算电网一次时间常数是开展电流互感器暂态特性分析的重要前提。利用电力系统全数字仿真装置的混合仿真功能,提出了一种准确计算电网一次时间常数的方法。通过对全系统机电暂态建模及局部电网电磁暂态建模,获取不同运行方式下的短路电流,滤波后得到短路电流的非周期分量,最终求得电网一次时间常数。仿真结果表明,所提出的算法具有较高的计算精度。
전망일차시간상수시결정비주기분량쇠감쾌만적인소,준학계산전망일차시간상수시개전전류호감기잠태특성분석적중요전제。이용전력계통전수자방진장치적혼합방진공능,제출료일충준학계산전망일차시간상수적방법。통과대전계통궤전잠태건모급국부전망전자잠태건모,획취불동운행방식하적단로전류,려파후득도단로전류적비주기분량,최종구득전망일차시간상수。방진결과표명,소제출적산법구유교고적계산정도。
The primary time constant of power grids is the major factor of determining the decay rate of non-periodic components.Accurate calculation of the primary time constant is the important premise of transient characteristic analysis of current transformers.Based on the hybrid simulation function of the advanced digital power system simulator,an accurate primary time constant calculating method is proposed.By developing the electromechanical transient model of the whole system and electromagnetic transient model of the local grid,short-circuit current in different operating modes is obtained.After filtering,the non-periodic component of short-circuit current is obtained and hence the primary time constant.Simulation results show that the algorithm has fairly high accuracy.