Engine recovery device

Abstract

The invention discloses an energy recovery device. The device comprises a frequency converter, an inverter and a three-phase power network. An inductor is arranged on a circuit at one end of the inverter, one end of the inductor is connected with a first diode, and the other end of the inductor is connected to a three-phase bridge-arm connected positive bus of the inverter; a current input terminal of the first diode is connected to a positive DC bus bar of the frequency converter, a current output terminal of the first diode is connected with the inductor; another circuit at one end of the inverter is connected with a second diode which has opposite current direction to the first diode, a current input terminal of the second diode is connected to a three-phase bridge-arm connected negative bus of the inverter, a current output terminal of the second diode is connected to a negative DC bus bar of the frequency converter, and the other end of the inverter is connected with the three-phase power network. The device is mainly used for frequency converters in need of regenerative electric power, and realizes harmonic wave control, reactive compensation and energy feedback power network control so as to achieve energy saving effect.

Description

Technical field: [0001] The invention relates to an energy recovery device, in particular to an energy recovery device used in a frequency converter that requires regenerative power generation. Background technique: [0002] As the core industry of modern logistics, the container transportation industry is developing rapidly with each passing day. Among them, refrigerated container storage and transportation is a kind of high-profit and high-risk container storage and transportation. It needs reliable support of high technology in order to effectively avoid high risks and obtain high profits. profit. At present, the power in conventional refrigerated container thermal performance tests is generally controlled by a relay, which directly adjusts the voltage of the heater in the container, including the voltage of the heater fan. This control and adjustment method makes the power fluctuation of the system difficult to stabilize. The obtained test results It cannot meet the req...

AI Technical Summary

Problems solved by technology

In the power application level of the hoist in the container terminal, the current inverter composed of 1700V hard switching devices has no problem with the energy feedback or reactive power control of the fundamental frequency; but it is difficult to control the harmonics well.

Images