A Self-Tuning Method of PI Controllers for DC/AC Inverters Based on Energy Balance Algorithm

In industrial field, PI controllers are widely used because of its strong applicability and good stability. However, due to their complex parameter adjustment, they are not suitable for complex and nonlinear systems. In this paper, the energy equilibrium relationship between the input energy, the energy stored in the LC element and the energy consumed by the load during the operation of the inverter is analyzed in detail. On this basis, a self-tuning method is designed to adjust the PI controllers by using the relation between the expected energy and the actual energy. Finally, simulations and experiments are used to verify the feasibility and effectiveness of the proposed method and its excellent dynamic response performance.