A Novel SVPWM Method for Parallel Resonant DC Link Inverter

In order to reduce the operating frequency and loss of the auxiliary commutation circuit and the current stress of auxiliary switches of the parallel resonant DC link inverter, this paper proposed a novel space vector pulse width modulation (SVPWM) method. The novel SVPWM method could reduce the number of operations of the auxiliary commutation circuit to once in every pulse width modulation (PWM) cycle on the premise of realizing soft switching of all switches, thereby reducing the operating frequency and loss of the auxiliary commutation circuit. At the same time, by adding the shunt dead time, the novel SVPWM method could avoid the superposition of the resonant current and load current, thereby minimizing the current stress of auxiliary switches. In addition, the novel SVPWM method could apply to any parallel resonant DC link inverter with the ability of variable zero voltage duration. Under the novel SVPWM method, according to the equivalent circuits of different operation modes, the operation principle, soft switching realization conditions and parameter design methods of the inverter awere analyzed. Finally, a 10kW/16kHz prototype was built using insulated gate bipolar transistors (IGBT) to verify the validity of the novel SVPWM method. © 2022 Chin. Soc. for Elec. Eng.