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电容式电压互感器暂态误差的数字校正方法
引用本文:熊小伏,周家启,周永忠,马春雷.电容式电压互感器暂态误差的数字校正方法[J].中国电机工程学报,2005,25(12):154-158.
作者姓名:熊小伏  周家启  周永忠  马春雷
作者单位:1. 重庆大学,重庆市,沙坪坝区,400044
2. 贵阳市南供电局,贵州省,贵阳市,550002
摘    要:电容式电压互感器(CVT)在输入电压信号发生突变时,其输出不能很快地跟随一次电压的变化而形成暂态误差。文中提出了应用CVT模型消除这一误差的数字校正方法。该方法利用改进欧拉法解代表CVT模型的一阶微分方程组,计算量小;还利用了叠加原理解决了算法的初值求解问题。数字仿真结果证明了该方法的有效性。利用该方法可为反应暂态原理的电力系统快速保护和测距装置提供准确的电压信号。

关 键 词:电容式电压互感器  校正方法  暂态误差  数字  微分方程组  改进欧拉法  信号发生  输入电压  求解问题  叠加原理  仿真结果  电压信号  测距装置  快速保护  电力系统  T模型  计算量  CV
文章编号:0258-8013(2005)12-0154-05
修稿时间:2005年1月20日

DIGITAL REVISION METHOD ON TRANSIENT ERROR OF CAPACITIVE VOLTAGE TRANSFORMER
XIONG Xiao-fu,ZHOU Jia-qi,ZHOU Yong-zhong,MA Chun-lei.DIGITAL REVISION METHOD ON TRANSIENT ERROR OF CAPACITIVE VOLTAGE TRANSFORMER[J].Proceedings of the CSEE,2005,25(12):154-158.
Authors:XIONG Xiao-fu  ZHOU Jia-qi  ZHOU Yong-zhong  MA Chun-lei
Affiliation:XIONG Xiao-fu1,ZHOU Jia-qi1,ZHOU Yong-zhong1,MA Chun-lei2
Abstract:With the sudden change of the input signal of the capacitive voltage transformer (CVT), the primary voltage can not been quickly tracked by the CVT output so that a transient error will be made.A digital revision method for eliminating the transient error is proposed firstly, in which the modified Euler method is used to resolve the first order differential equations deduced from the CVT model, so the computation is small. Also the principle of superposition is utilized to resolve the problem of initial value. Finally, the validity of the method proposed is proved by the result of digital simulation. The revised CVT output obtained by the method can be used as correct voltage inputs of power system fast protections and fault locating devices based on the transient theory.
Keywords:Capacitive voltage transformer  Model  Transient error  Digital revision
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