Study on Grounding Method of DC System in AC and DC Hybrid Power System of Industrial Park

The grounding method has a major influence on the safe and stable operation of the power system. The grounding method for each specific power system needs to be carefully studied. In this paper, the grounding method of DC system in the system was studied in the scenario of AC/DC hybrid distribution network system in industrial park. The influencing factors of grounding and the current research status of medium and low voltage DC system grounding were analyzed. The grounding method of 10kV DC system was analyzed by simulation. According to research, it was recommended to use high-impedance grounding method for 10kV DC system. It was recommended to use capacitor midpoint direct grounding method for ±375V DC system. The capacitor midpoint was not grounded for 240V DC system. The above research provides reference for the selection of the grounding method of the DC system in the AC/DC hybrid distribution network system of the industrial park.