一种兼顾速度和抗干扰能力的电压暂降检测方法

Voltage Sag Detection Method Considering both Speed and Anti-Interference Ability

在对比各种电压暂降检测方法的基础上,提出了一种兼顾速度和抗干扰能力的电压暂降检测方法。采用滑动窗计算单相电压的1/4周期有效值,同时根据数字锁相环锁定的相位,实时计算单相电压的有效值。仿真和实际测试表明,所提方法物理意义明确、计算简单、实时性较好、抗干扰能力较强,兼顾了动态电压调节器对速度和抗干扰能力的要求,可较好地应用于仅需电压幅值暂降检测的工程。

Based on the comparison of various voltage sag detection methods, the voltage sag detection method that takes into account the speed and anti-interference ability is proposed.The sliding window is used to calculate the effective value of 1/4 cycle of single-phase voltage.Simultaneously the effective value of single-phase voltage is calculated in real time according to the phase locked out by digital phase-locked loop.The simulation and actual test show that the proposed method has clear physical meaning, simple calculation, good real-time performance and strong anti-interference ability.The requirements of dynamic voltage regulator for speed and anti-interference ability are taken into account.It can be well applied to engineering practice where only voltage amplitude sag detection is required.