基于IIR低通滤波器的快速正弦电压有效值新算法

New algorithm to rapidly get sinusoidal voltage effective value based on IIR low-pass filter

针对Vehicle to Grid充电系统,在比较全周期采样法、导数法以及迭代法求正弦电压有效值的基础上,提出基于IIR低通滤波器的快速计算正弦电压有效值的新方法.该算法对一个电压采样值进行平方计算,得到一个含有直流分量的交流信号,随后对该信号进行IIR低通滤波,滤除直流以外的一切交流信号,得到直流分量,即电压最大值的平方的一半,亦即电压有效值的平方,从而得到电压有效值.这一过程可以保证滤波后得到的直流分量不含有任何高频信号,并且,只需一个电压采样值就可以计算得出电压有效值,相对于前3种方法更加快速、便捷,具有更强的抗扰能力.利用Matlab/Simulink建立Vehicle to Grid充电系统模型,运用新算法求电压有效值,结果达到预期效果.

A new method is proposed to rapidly get sinusoidal voltage effective value based on IIR low-pass filter comparing full-cycle sampling method, derivative method and iterative method in charging system for the Vehicle to Grid. Firstly, the mean-square of voltage is calculated to get AC signal with DC component. Then, the AC component of the mean-square voltage is filtered using IIR low-pass filter and get the half of the mean-square of maximum voltage, which is the square of voltage effective value, and then the voltage effective value is obtained. This algorithm can get filtered DC component without high-frequency components, only needs one sample of voltage to get voltage effective value rapidly as well as conveniently and has strong anti-jamming capability comparing to the other three methods previously in Matlab / Simulink, and the mentioned. The Vehicle desired voltage effective to Grid charging system value is achieved using th model is established e new algorithm.