一种带IIR滤波器的UPS旁路掉电检测算法

UPS Bypass Power-down Detection Algorithm with IIR Filter

传统UPS旁路掉电检测采用电压有效值、电压瞬时值及二者相结合检测手段,存在检测速度慢、抗干扰能力差等缺点。采用d-q变换及反变换、IIR滤波器以及电压分段检测方法提高掉电检测的快速性(<6ms)及控制系统的鲁棒性进而有效地解决了传统掉电检测的不足。根据数字滤波器指标计算模拟滤波器极点,由极点推算模拟滤波器的传递函数,利用双线性z变换求出数字滤波器的传递函数实现IIR滤波器的设计。最后在一台80kVA数字化控制三相UPS样机上验证了算法及理论分析的正确性。

Traditional UPS bypass power-down detection use voltage RMS detection, voltage instantaneous value detection or a combination of them., so has low detecting speed or weak anti-interference ability. With d-q transform and inverse transform, IIR filter and voltage segment detection, can improve detecting speed （〈6ms） and the control system＇s robustness, then solve the deficiency of the traditional power-down detection. Calculate the analog filter＇s poles according to digital filter＇s performance, then calculate the analog filter＇s transfer function with these poles, then use bilinear z transform to calculate the digital filter＇s transfer function to realize the design of IIR filter. Finally, verify the feasibility of algorithm and theoretical analysis on a 80kVA digital controlled three phase UPS model machine.