Efficient Electromagnetic Transient Modeling and Simulation Method for Active Neutral-Point-Clamped Three-Level Converter

Abstract

Active neutral-point-clamped (ANPC) topology three-level converter is widely used in medium- high voltage new energy power stations. Aiming at the shortcomings of existing electromagnetic transient modeling methods in model accuracy, computational efficiency and simulation scale in small step real-time simulation, an efficient electromagnetic transient simulation model was proposed. Based on the associated discrete circuit of the ANPC three-level, the model constructed a multi-port Norton equivalent circuit to replace the bridge arm for the electromagnetic transient simulation of the network. This model achieved node dimension reduction and simulation acceleration without loss of modeling accuracy. An ANPC three-level converter simulation system based on the equivalent model was built in MATLAB / Simulink platform. Compared with the detailed model simulation results, the equivalent model can accurately simulate the steady-state and transient operating conditions, and has obvious simulation speed-up performance.