An efficient electromagnetic transient modeling and simulation method for ANPC three-level converters

Abstract

According to a small-step real-time simulation study on active neutral-point clamped （ANPC） three-level converters， existing electromagnetic transient modeling methods are inferior in model accuracy， computational efficiency， simulation scale， etc. To this end， an efficient electromagnetic transient simulation model is proposed. The model is built based on the associated discrete circuit （ADC） of the ANPC three-level bridge arm， and the internal nodes are eliminated by the WARD equivalence theory to construct an externally equivalent multi-port Norton equivalent circuit that replaces the bridge arm for solving the electromagnetic transient simulation of the network and achieving node reduction and simulation acceleration without spoiling modeling accuracy. A simulation system of the ANPC three-level converters based on this equivalent model is 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 significantly accelerate the simulation.

Keywords

• anpc three-level converter
• electromagnetic transient model
• norton equivalent circuit
• small-step real-time simulation