Electromagnetic Transient Calculation of Distribution Network System Based on Lie Series-Padé Algorithm

With the expansion of the scale and complexity of the distribution network, the electromechanical transient simulation of the distribution network based on the traditional quasi-steady state assumption can no longer meet the current demand, and more accurate electromagnetic transient simulation calculation is needed. In order to improve the efficiency of electromagnetic transient simulation for large-scale distribution system, a new method based on the Lie Series-Padé algorithm is proposed in this paper. Firstly, the electromagnetic transient model of distribution system is established, including transformer electromagnetic transient model, distribution line electromagnetic transient model and induction motor electromagnetic transient model considering connection mode. Then, a numerical algorithm based on Lie Series-Padé approximation is proposed, which has the advantages of high precision, strong stability and explicit format, and is more suitable for large-scale electromagnetic transient simulation than the traditional implicit ladder method. Finally, a framework for electromagnetic transient simulation of distribution network system based on Lie Series-Padé algorithm is constructed, and a practical distribution network example is used to compare the proposed algorithm with the simulation results of PSCAD to verify the effectiveness of the proposed algorithm.