Model predictive control of H-bridge inverter based on discrete-time model of equivalent circuit

Compared to analog control systems, digital control systems possess evident advantages. In the field of power electronics, digital control systems have been widely used in real applications. However, digital control systems take extra control delay into the original system, which will reduce system performance and stability margin. When control parameters are not well selected, system may occur complex bifurcation phenomenon. Based on discrete-time modeling of equivalent circuit, this paper presents a model predictive control method. This method has the ability to suppress the influence of digital control delay, and to increase stability range of the system. Taking H-bridge inverter with LC filter as an example, the equivalent circuit and model predictive control method are derived. Moreover, the proposed method is validated by simulations and experiments.