Minimum-voltage, active-clamp and three-phase grid-connected inverter
An inverter and voltage technology, which is applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. The effect of improving power density, improving circuit efficiency, and increasing operating frequency
Inactive Publication Date: 2010-07-21
ZHEJIANG UNIV
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The invention discloses a minimum-voltage, active-clamp and three-phase grid-connected inverter, which comprises a DC inverter power supply, an AC filter inductor and a three-phase bridge arm. The three-phase bridge arm consists of 6 full-control master switches with anti-parallel diodes, an auxiliary switch with an anti-parallel diode is connected between the DC inverter power supply and the DC bus of the three-phase bridge arm, the two ends of the master switches and the auxiliary switch are all connected with a capacitor in parallel, and the two ends of the auxiliary switch are bridged with a resonance branch formed by serial connection of a resonance inductor and a clamp capacitor. The inverter of the invention has simple structure and adopts an improved space vector modulation method. When the power-factor angle of the grid-connected current of the inverter is between minus 30 degrees and plus 30 degrees , the zero-voltage switching-on of all the master switches can be realized through one action of the auxiliary switch in each switching period, the reverse recovery current of the anti-parallel diodes of the master switches are inhibited, and the switch voltage stress is equal to the voltage of the DC inverter power supply. Moreover, due to the low switching loss and high circuit efficiency, the invention facilitates the improvement of the operating frequency, thereby enhancing the power density.
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