Research on the Integration of High and Low Voltage Power Distribution Cabinet and Fault Monitoring Device Based on PLC and Inverter

With the rapid economic growth and the continuous increase in power load, users have increasingly demanded power quality, and the importance of fault-free monitoring of distribution networks has also increased. This article introduces the hardware of the control system. According to the actual speed range and load of the original DC speed control system, the appropriate frequency conversion asynchronous motor, frequency converter and encoder for measuring the speed are selected. In this paper, the overall design of the online monitoring system for the integrated equipment of high and low voltage distribution cabinets is carried out. The online monitoring system of the fault monitoring device is composed of intelligent capacitors, power information collection terminals and the host station of the host computer. The power information collection terminal collects the working condition and alarm information of each capacitor through the RS485 communication line, and then uploads it to the host station of the upper computer through GPRS. The staff can monitor the reactive power compensation device in real time on the main station operation page. By analyzing the influence of the control parameters and load size of the rectifier and inverter sides of the system on the fault diagnosis effect and the simulation results of the fault diagnosis on both sides, a robust fault characteristic index is proposed for reliable and rapid diagnosis.