Inverter output voltage under different type of loads

This paper presents an application of deadbeat control theory in control of the DC/AC single-phase voltage source PWM inverter (VSI PWM). The main object of the article is to ensure a high quality of the inverter output voltage under different types of load (linear and nonlinear). One of the main criteria of the quality of the output voltage is total harmonic distortion (THD). It should be kept as small as possible. This article describes a detailed modelling of the plant and controller design. A novel multi-loop control technique based on deadbeat theory is proposed in order to achieve sinusoidal output voltage. The proposed control scheme consists of current and voltage loop. Theoretical analysis, simulation and practical results have been given to verify the proposed digital control scheme. Proposed control scheme was implemented into the TMS320F28335 DSC controller and tested on 1 kW PWM inverter.