Analysis and design of an efficient three-phase voltage source inverter with performance optimization

The paper designs a novel efficient three-phase voltage source inverter with performance optimization. When auxiliary circuits connected in parallel with every bridge arm are involved in working process of the designed inverter, main switches will realize zero-voltage switching in the wide load range, which is beneficial for further decline of the loss of main switches. Furthermore, the optimized duty cycle of the gate drive signal of auxiliary switches is used to restrict circuiting current loss. Besides, when the designed inverter works in a dead zone, the resonance will occur in the auxiliary circuits to cause the output phase voltage to vary from zero or the DC supply voltage to the DC supply voltage or zero as soon as possible, which is beneficial for further decline of the output phase voltage error and the suppression of dead effect. The paper provides relevant analysis on each working status within a switching period along with design requirements. By analyzing test waveforms, it affirms that main switches realize zero-voltage switching. The efficiency of the designed inverter reaches 98.8% at rating condition. The experiment affirms that the designed inverter has an edge over another two inverters for comparison in performance optimization. The paper designs a novel efficient three-phase soft-switching inverter with the improved THD of the output current. Main switches can realize zero-voltage switching. The experimental efficiency and THD curves manifest the advantages of the designed inverter over comparison objects. image