Voltage control of three phase inverters by using active disturbance rejection control

Control of three phase inverters is of paramount importance in the realm of control applications. In this regard, this paper proposes active disturbance rejection control (ADRC) scheme as a new method for voltage control of three phase inverters in UPS applications. The main advantage of ADRC refers to the fact that it is model independent. In this paper, the controller is composed of a double loop structure including an inner current loop and outer voltage loop. This structure is used in a three phase inverter in order for implementation of voltage control. To draw a comparison between ADRC and PI as the common control method, a case study has been simulated in SIMULINK. Simulation results approve the mentioned advantage of ADRC in response to the changes in the system parameters. In other words, any change in the system parameters causes drastic changes in dynamic characteristics of PI, while ADRC is stiff under different conditions. This is an important feature which fosters the idea of exploiting ADRC in industrial applications, in which case the controller should be able to endure uncertainties about parameters.