Sliding mode control of a third-order quantum resonant inverter for sinusoidal output voltage generation

This paper presents a new inverter topology based on a third-order quantum resonant converter. The power stage consists of an input and output filter, a three-elements resonant network, and only three bi-directional switches which exhibit zero-current switching conditions. To control the switches, a closed-loop nonlinear control scheme is proposed in order to both achieve bi-directional power flow and make the output voltage have the same waveform and frequency as the line voltage. The controller is based on the sliding mode control theory, and consists of a time-dependent switching surface and a high frequency control law. The controller provides the following features: good transient response, absence of steady-state errors in the output voltage, and robust dynamic behavior with respect to external disturbances