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。
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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第12期154-158,共5页
Proceedings of the CSEE
