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Frequency converter power unit and frequency converter

A power unit and frequency converter technology, which is applied in the direction of converting AC power input into AC power output, output power conversion device, and irreversible AC power input conversion into DC power output, etc., can solve problems such as motor 5 not working.

Inactive Publication Date: 2016-10-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the grid is powered off, since the frequency converter no longer outputs voltage to the motor 5, the motor 5 cannot work

Method used

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  • Frequency converter power unit and frequency converter
  • Frequency converter power unit and frequency converter
  • Frequency converter power unit and frequency converter

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0019] image 3 is a schematic diagram of a frequency converter 6 according to an embodiment of the present invention. Figure 5 is a detailed structural diagram of the power unit 1 in the corresponding frequency converter. Will image 3 , 5 and figure 1 , 2 In contrast, it can be found that, compared with the prior art, the frequency converter 6 according to the embodiment of the present invention is connected with an energy storage circuit 14 between the rectifier 11 and the inverter 12, and the energy storage circuit 14 includes an energy storage device 141 and a The charge-discharge module 142 charges the energy storage device 141 in the first state and discharges the energy storage device 141 in the second state...

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Abstract

The invention provides a frequency converter power unit and a frequency converter. The frequency converter power unit comprises a rectifier, an inverter and an energy storage circuit, wherein the rectifier is used for rectifying an alternating voltage of a first frequency into a direct voltage; the inverter is used for inverting the direct voltage into an alternating voltage generating a second frequency; the energy storage circuit is connected between the rectifier and the inverter; and the energy storage circuit includes an accumulator and a charge and discharge module which charges the accumulator under a first state and discharges from the accumulator under a second state. In embodiments of the invention, when a power grid is in an outage state, under the condition of not depending on other external functions, a motor can still work for a period of time, and electric power usage efficiency is increased.

Description

technical field [0001] The invention relates to the field of electric transmission, in particular to a frequency converter power unit and a frequency converter. Background technique [0002] The frequency converter is a power control device that uses the on-off function of power semiconductor devices to convert the power frequency power supply to another frequency. The high-voltage inverter is generally connected between the three-phase input of the power grid and the motor, and the motor drives the load. Due to the different conditions of the load, such as the energy consumption of the locomotive when it starts, actuates, accelerates, and decelerates, it is necessary to adjust the speed of the motor according to the change of the load in actual operation, and the speed of the motor depends on the high-voltage inverter. It is adjusted by outputting voltages of different frequencies to the motor. Therefore, the high-voltage frequency converter plays the role of adjusting th...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/34
Inventor 周友吴峂
Owner CHNA ENERGY INVESTMENT CORP LTD
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