Balancing Simulation Speed and Accuracy for Grid-connected Photovoltaic Power Systems

This paper develops efficient algorithms for balancing simulation accuracy and speed in time-domain simulation of high-frequency power electronic converters. Time-domain simulation requires careful selection of step size and solvers for numerical accuracy and stability. To achieve an optimal balance between simulation accuracy and speed, a Discrete Network Model is proposed by splitting the system into multiple sub-networks and building equivalent models for individual components with decoupling between stages. This significantly improves simulation efficiency while accurately capturing switching rip-ples. A case study in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed method for simulating a three-phase grid-connected photovoltaic system by comparing it to conventional methods.