本文介绍了一种基于单片机的低压电网功率因数监测与自动补偿系统。其设计采用AT89S52单片机作为测控核心,通过电压和电流互感器采集电压和电流信号,采用数字检测电路来获取电压电流的相位差,利用单片机对功率因素的实时监测来控制电容器投切,投切控制开关采用过零型固态继电器,使投切控制实现等电压投入,零电流切除。该装置具有对电网冲击小,响应快,抗干扰能力强,精度高等优点。 This article describes a low-voltage power system based on single-chip power factor monitoring and automatic compensation system. The design uses AT89S52 microcontroller as the measurement and control core, voltage and current transformer voltage and current signal acquisition, the use of digital detection circuit to obtain the voltage and current phase difference, the use of single-chip real-time monitoring of power factor to control the capacitor switching, switching control Zero-type switch using solid-state relay, so that switching control voltage input, zero current cut. The device has a small impact on the power grid, fast response, anti-interference ability, high accuracy.