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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of three-phase inverter can realize the function of grid-connected power generation, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the increase of the operating frequency, reduces the circuit efficiency and has relatively large large electromagnetic interference

Method used

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  • Minimum-voltage, active-clamp and three-phase grid-connected inverter

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Embodiment Construction

[0015] refer to figure 2 , the minimum voltage active clamp three-phase grid-connected inverter of the present invention includes the power supply V on the DC side of the inverter dc , consisting of six fully controlled main switches S with anti-parallel diodes 1 ~S 6 The three-phase bridge arms formed are respectively connected to the output filter inductance L between the midpoint of each phase bridge arm and the AC grid a ~ L c , which is characterized by the six main switches S of the three-phase bridge arm 1 ~S 6 Parallel capacitor C 1 ~C 6 , power supply V on the DC side of the inverter dc Auxiliary switch S with anti-parallel diode is connected between DC bus and three-phase bridge arm 7 , auxiliary switch S 7 Parallel capacitance across both ends of the C 7 , and at the auxiliary switch S 7 Connected across both ends by the resonant inductor L r with clamp capacitor C c series resonant branch.

[0016] figure 2 In the specific example shown, the auxili...

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Abstract

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.

Description

technical field [0001] The invention relates to an inverter, especially a minimum voltage active clamp three-phase grid-connected inverter. Background technique [0002] A three-phase inverter with grid-connected power generation function, its circuit is as follows figure 1 As shown, it consists of six fully controlled main switches with anti-parallel diodes (S 1 ~S 6 ) constitutes a three-phase bridge arm, respectively connected to the output filter inductance (L a ~ L c ). This kind of three-phase inverter can realize the function of grid-connected power generation, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the increase of the operating frequency, reduces the circuit efficiency and has relatively large large electromagnetic interference. Contents of the invention [0003] The purpose of the present invention is to provide a minimum voltage active ...

Claims

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Application Information

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IPC IPC(8): H02M7/521H02M7/516H02M1/44H02M1/12
Inventor 李睿徐德鸿马致远
Owner ZHEJIANG UNIV
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