Efficient rectification-inversion-integrated energy feedback system

Abstract

The invention discloses an efficient rectification-inversion-integrated energy feedback system. A front-level circuit includes a filter, a three-phase controllable rectifier, DC bus capacitors, a network voltage detection circuit, a DC bus voltage detection circuit, an input current sensor, a control circuit and three two-way switches; every two DC bus capacitors are connected in series and then connected in parallel; one end of each two-way switch is connected to the midpoint of corresponding one of three bridge arms of the controllable rectifier, and the other end of each-two-way switch is connected to a series connection point of the DC bus capacitors. A rear-level circuit includes a three-phase inverter and a motor. When bus voltage is lower than a set value, switching tubes of the three-phase controllable rectifier are all switched off; a reverse parallel diode of the three-phase controllable rectifier and the three two-way switches form a boosting rectifier for power factor correction to supply power for the rear-level circuit; when the bus voltage is higher than the set value, the three two-way switches are not communicated, and the controllable rectifier feeds generated electricity to a power grid in a feedback mode and in a three-phase inverter mode. The efficient rectification-inversion-integrated energy feedback system integrates rectification and inversion and has the advantages of being high in power factor, high in efficiency and the like.

Description

technical field [0001] The invention relates to an energy feedback system, in particular to a rectification and inverter integrated power electronic system using three-phase power supply. Background technique [0002] Under the global trend of developing green economy and advocating low-carbon life, energy-saving, environmentally friendly and low-carbon industries are an inevitable choice for energy conservation and consumption reduction. The energy-saving renovation project of the motor system has become a focus of the country's energy-saving and emission reduction. [0003] In some occasions where the motor starts and stops quickly and frequently rotates forward and reverse, when the motor brakes and drives the potential energy load to drop, the motor is in the state of generating electricity. It will inject current into the inverter bus of the motor to increase the bus voltage of the inverter. When the pumped voltage reaches a certain value, it will break down the w...

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a high-efficiency rectification and inverter integrated energy feedback system, which is used to overcome the disadvantages of low efficiency due to large switching loss, driving loss and conduction loss of the existing integrated energy feedback system in the rectification mode. Provide an integrated energy feedback system that can effectively improve rectification efficiency

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