摘要
该文提出了一种改进的电压凹陷特征量实时检测方法,利用待测的电压量作为α轴分量,用待测量和延时量的代数运算结果构造β轴分量,通过αβ-dq变换和低通滤波得到凹陷特征量,比延时60°的方法的构造过程简单、计算量小;改进方法的延时可以和采样步长准确对应,在现有硬件条件下能够大大减小检测凹陷特征量的延时,最小延时可以达到补偿过程中的采样步长,在每个周期的采样点足够多时,可以认为这种方法没有延时,从而提高了补偿的实时性和精确性,适合工程应用。仿真结果证明了这种方法的有效性。
This paper proposes an advanced method of real-time detection of voltage sag characteristics. It uses voltage to be detected as voltage component of axis. It utilizes the voltage and its delayed value to construct voltage component of axis. Thus voltage sag characteristics can be got through αβ-dq transformation and low-pass filter. The method is simpler to construct unknown value and has less computation than method which has 60°delay. Delay of the method can be exactly corresponded to the sample step. Therefore, advanced method can reduce delay of the detection of sag characteristics greatly under current hardware condition. The smallest delay of the method equals to sample step. The method can be considered as real-time if the sample points are enough more. As a result, the method improves the real-time quality and precision of compensation. Simulation results illustrate the effectiveness of the method.
出处
《继电器》
CSCD
北大核心
2005年第22期57-60,共4页
Relay
