Switching Frequency Limited Hysteresis Based Voltage Mode Control of Single-Phase Voltage Source Inverters

This paper proposes a new control strategy for single-phase voltage source inverters that does not rely on switching based Pulse Width Modulation. The technique is similar to conventional current hysteresis control, but instead of the output current, low-pass-filtered inverter utilised as feedback signal. Nevertheless, instants are determined by predefined band, rather low-cost Complex Programmable Logic Device (CPLD)-based logic, which ensures nearly constant frequency. Similar hysteresis-based methods, proposed method rapid dynamic response. Notable characteristics include quick response, well-defined harmonic spectrum, and an improved total distortion (THD), particularly during load changes. implemented 1 kW, 230 V, 50 Hz prototype. Simulation experimental results presented validate concept, demonstrates superior response enhanced THD variations.