混压同塔四回输电线路零序参数测量方法  

An Approach for Measuring the Zero Sequence Parameters of MixVoltage Quadruple-Circuit Transmission Lines on One Tower

作　　者：倪识远 胡志坚[1] 杨安琪[1] 傅晨宇[1] Ni Shiyuan;Hu Zhijian;Yang Anqi;Fu Chenyu(School of Electrical Engineering Whuhan University Whuhan 430072 Chin)

机构地区：[1]武汉大学电气工程学院,武汉430072

出　　处：《电工技术学报》2018年第11期2468-2478,共11页Transactions of China Electrotechnical Society

摘　　要：混压同塔四回输电线路的电磁耦合情况复杂,待测零序参数众多,现有方法不能精确测量其零序参数。提出了一种混压同塔四回线路零序参数精确测量方法,建立了混压同塔四回线路的分布参数模型,通过求解传输线方程,得到了与混压同塔四回线路零序参数相关的传输矩阵。利用多次独立测量方式下混压同塔四回输电线路两端的同步电压和电流测量数据,结合传输矩阵,得到了混压同塔四回线路18个零序参数的计算方法。针对实际应用中可能出现感应电压干扰的问题,提出综合使用增量法的解决方案。利用PSCAD对该测量方法进行了仿真验证。仿真结果表明,该方法克服了长距离线路的分布效应影响,修正现有方法的测量模型,解决了分布参数模型不精确的问题。零序参数计算结果不受理论值初值影响,适用于任意电压等级的混压同塔四回线路。该方法的测量步骤简便,可以在线路完全停电或部分停电条件下使用。The electromagnetic coupling of mix-voltage quadruple-circuit transmission lines is complex which leads many zero sequence parameters needed to be measured. The existing methods can’t accurately measure these parameters. A method to accurately measure the zero sequence parameters of mix-voltage quadruple-circuit transmission lines was proposed. The distributed parameter model of the mix-voltage quadruple-circuit transmission lines was established. The transmission matrix which was related with these zero sequence parameters was obtained by solving transmission equations. The synchronous voltage and current data measured at the two ends of the four circuits and the transmission matrix were employed. And the calculation method of 18 zero sequence parameters was derived. Induced voltage interference was considered and an incremental method was put forward to eliminate it. PSCAD was employed to verify the proposed measurement method. The simulation results show that the proposed method overcomes the distribution effect of long distance transmission lines. The measurement model of the existing method was modified. The problem that the distributed parameter model of the existing method is not accurate enough was solved. The proposed method was hardly affected by the initial theoretical values and can apply to quadruple-circuit transmission lines with any voltage classes. The measurement procedure is simple and the proposed method can be used in the transmission lines which are completely or partly out of service.

关 键 词：混压同塔四回线路 零序参数 分布参数模型 同步测量 

分 类 号：TM934[电气工程—电力电子与电力传动]