Parallelable large energy feedback device electricity-saving device

Abstract

The invention provides a parallelable large energy feedback device electricity-saving device, and belongs to the energy-saving technical field of motors. The invention mainly solves the problem that the existing energy feedback device is very difficult to be applied to large-power occasions. The electricity-saving device is mainly characterized by comprising a module and a control circuit, wherein the module is formed by a three-phase inverter bridge and an LC three-phase filter circuit, the direct current side end of the three-phase inverter bridge is used for being connected with a direct current bus of a converter, an alternating current output side of the three-phase inverter bridge is connected with an electric reactor which is arranged in the LC filter circuit and is not connected with a capacitor, the other end of the electric reactor is used for being connected with a three-phase power grid, the control circuit is formed by a sampling circuit and a DSP (Digital Signal Processor), the output end of the DSP is respectively connected with the control end of the three-phase inverter bridge. With the adoption of the device provided by the invention, direct current electric energy generated by motor brake can be converted into alternating current to be fed back to the power grid, the respond speed is high, the current sharing effect is good, and the reliability is high, and the device is mainly used on the large brake electric energy occasions such as motors of belt conveyors, centrifugal machines and hoisters.

Description

technical field [0001] The invention belongs to the technical field of motor energy saving, in particular a parallel-connectable large-scale energy feedback device energy-saving device combined with a frequency converter and used in the occasions where the braking electric energy of belt conveyors, centrifuges, hoist motors, etc. is relatively large. Background technique [0002] The energy problem is a prominent issue that determines the social development in the new century. How to improve the utilization rate of energy has attracted the attention of people all over the world. The energy feedback type active inverter, as the access to the power grid, can realize the conversion of direct current and alternating current, and has broad application prospects. The power feedback system can invert the energy of the capacitor in the frequency converter into a current that is in phase with the grid voltage and return it to the grid. While reusing mechanical energy, it reduces the...

AI Technical Summary

Problems solved by technology

However, it is more difficult to implement a single machine, because as the power level increases, the reactor and IGBT need to bear more current, and the heat dissipation and stability of the device are affected. In order to solve the problem of limited capacity of the energy feedback device, the present invention A method of paralleling energy to realize energy feedback expansion is proposed to meet the application occasions with large demand for feedback power

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