Method for Calculating Grounding Quantity of TN-C System Based on Multi-objective Optimization

Aiming at the investment cost and safety, a mathematical model for giving the grounding point configuration is established for the TN-C grounding system of the power system, and a complete solution method is given. Firstly, based on the analysis of the characteristics of the TN-C grounding system, a mathematical model for configuring the grounding position to meet the lowest investment cost and the lowest contact voltage is presented. Aiming at the requirement of meeting the minimum contact voltage in this model, this paper gives a detailed calculation method for the contact voltage in the TN-C grounding system. Then combined with the actual characteristics of the model, this paper gives an unconstrained form and further The idea of using particle swarm optimization to solve the problem is given. Finally, a case study system is designed in this paper. The analysis program is compiled in MATLAB and the case analysis is carried out. The results show that the proposed method is feasible and effective.