DC (direct current) feed type motor energy saving device

Abstract

The invention discloses a DC (direct current) feed type motor energy saving device and belongs to the field of motor drive application. The device comprises a motor controller with a DC bus, a bidirectional DC / DC converter, a super capacitor and a detection control circuit, wherein the AC (alternating current) input end of the motor controller is connected to a power grid AC bus; the output end of the motor controller is connected with the motor; the high-voltage end of the bidirectional DC / DC converter is connected with the DC bus of the motor controller; the low-voltage end of the bidirectional DC / DC converter is connected with the super capacitor; and the detection control circuit is connected with the DC bus of the motor controller, the power grid AC bus and the bidirectional DC / DC converter respectively. The device disclosed by the invention is simple and reasonable, can be used for realizing power saving, preventing harmonic interference on the power grid and guaranteeing the quality of the power grid, and is low in cost.

Description

technical field [0001] The invention belongs to the field of motor drive applications. Background technique [0002] The motor drive system is a very widely used component, which plays an indispensable role in the national economy and the people's livelihood. In some specific applications, the motor works in the state of alternating motor / generator, and the motor generated when the motor works in the state of generator Electric energy is wasted in vain. At present, some motor drive systems adopt the power feedback method, that is, the energy absorbed from the grid is provided to the motor, and at the same time, the power generated when the motor is working as a generator can be fed back to the grid. Synchronous inverters feed back energy to the grid. The disadvantage is that when feeding back energy to the grid, it will cause harmonic interference to the grid, affecting the quality of the grid. At the same time, the control is complicated and the cost is high. Contents of...

AI Technical Summary

Problems solved by technology

At present, some motor drive systems adopt the power feedback method, that is, the energy absorbed from the grid is provided to the motor, and at the same time, the power generated when the motor is working as a generator can be fed back to the grid. Synchronous inverters feed back energy to the grid. The disadvantage is that when feeding back energy to the grid, it will cause harmonic interference to the grid, affecting the quality of the grid. At the same time, the control is complicated and the cost is high.

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