Fixed-admittance model and parameter optimization of multiple converters considering steady-state space and error correction

The multi-converter is a common and critical equipment in modern power systems, and its dynamic response has a significant impact on the stability of simulation for new grid systems. However, the traditional modeling methods have the disadvantages of not considering the coupling branch and the large transient response error when dealing with the grid-connected simulation of multi-converter. To address these issues, this paper proposes an accurate simulation model for multi-converter power electronic systems based on parameter configuration thought. Firstly, a parameterized inductor capacitor equivalent model is established for the multi-converter. Then, the overall analysis of the multi-converter is carried out, considering the influence of the coupling branch of the common impedance, the simulation step size and the steady-state error, the overall switching parameters of the multi-converter are optimized and configured with multiple objectives based on particle swarm optimization. At the same time, the stability of the discrete domain of the system after parameter configuration is ensured. Finally, the accuracy of the proposed model is validated through a test case.