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Five-level frequency converter precharging device, control device and control method

A technology of a control device and a control method, applied in the field of high-voltage frequency converters, can solve problems such as narrow application range, and achieve the effects of wide application range, ingenious overall structure design, and reduction of the number of components

Active Publication Date: 2014-12-24
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional charging circuit and charging method are generally only for inverters with a specific level number characteristic topology, and the scope of application is narrow.

Method used

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  • Five-level frequency converter precharging device, control device and control method
  • Five-level frequency converter precharging device, control device and control method
  • Five-level frequency converter precharging device, control device and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: see figure 1 , figure 1 It is a circuit structure diagram of a general five-level frequency converter including the precharging device circuit of the present invention. Such as figure 1 As shown, the pre-charging device includes a three-phase transformer T, a three-phase switch K, and a three-phase AC power supply AC; one end of the three-phase transformer T can be connected to the input of a five-level inverter terminal and the input filter, or between the high voltage switch S and the input filter, and the other end of the three-phase transformer T is connected to one end of the three-phase switch K. One end of the three-phase switch K is connected to a three-phase transformer, and the other end is connected to a three-phase AC power supply AC.

[0022] The control method of the control device is divided into three steps. Step 1, open the high-voltage switch S, close the three-phase switch K, pass the three-phase A current power supply AC, flow through...

Embodiment 2

[0023] Example 2: figure 2 It is a circuit structure diagram of a diode-clamped five-level frequency converter comprising a pre-charging device circuit according to the present invention, as figure 2 As shown, the circuit structure diagram of the diode-clamped five-level inverter includes the pre-charging device described in the present invention, the power grid, the high-voltage switch S, the input filter, and the three-phase diode-clamped five-level inverter. The position connection relationship of the charging device, the power grid, the high-voltage switch S, and the input filter is the same as that of the first embodiment.

[0024] The control method for the diode-clamped five-level inverter is divided into three steps. Step 1, open the high-voltage switch S, close the switch K, pass the power supply AC, flow through the switch K, and pass through the transformer to the five-level inverter. The capacitor inside is charged; step 2, open the high-voltage switch S and thr...

Embodiment 3

[0025] Example 3: see image 3 , image 3 It is a circuit structure diagram of a flying capacitor type five-level frequency converter comprising a pre-charging device circuit according to the present invention, as image 3 As shown, the circuit structure diagram of the three-phase flying capacitor type five-level inverter includes the pre-charging device described in the present invention, the power grid, the high-voltage switch S, the input filter, the three-phase flying capacitor type five-level inverter, Wherein the pre-charging device, the power grid, the high-voltage switch S, and the position connection relationship of the input filter are the same as those in the first embodiment.

[0026] The control method for the three-phase flying capacitor type five-level inverter is divided into three steps. Step 1, open the high-voltage switch S, close the three-phase switch K, pass the power supply AC, flow through the three-phase switch K, and pass through the transformer C...

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Abstract

The invention relates to a five-level frequency converter pre-charging device which comprises a three-phase transformer T, a three-phase switch K and a three-phase AC power supply. The three-phase switch K is arranged between the three-phase transformer T and the three-phase AC power supply. The invention further relates to a control device of the precharging device. The control device comprises a power grid, a high-voltage switch S, the precharging device and a multiple-level frequency converter. The precharging device is arranged between an input filter and the multiple-level frequency converter; one end of the three-phase transformer T is connected between an input end of the multiple-level frequency converter and the input filter, and the other end of the three-phase transformer is connected to one end of the three-phase switch K; one end of the three-phase switch K is connected with the three-phase transformer, and the other end of the three-phase switch K is connected with the three-phase AC power supply; and the high-voltage switch S is arranged between the power grid and the input filter.

Description

technical field [0001] The invention relates to a pre-charging device, in particular to a multi-level inverter pre-charging device, a control device and a control method, and belongs to the technical field of high-voltage inverters. Background technique [0002] For five-level inverters, the traditional charging circuit is composed of high-voltage relays and power resistors in each power unit. Due to the large size of the high-voltage relays and power resistors, the cost is high, and the inverter contains multiple power units. , which leads to the characteristics of many components, large volume, high cost, and high power consumption of the high-voltage inverter. Therefore, it is difficult to apply and promote this charging method in the actual five-level high-voltage inverter system. The traditional charging circuit contains a diode for rectification, and then charges the capacitor. If the preset value of capacitor charging is higher, the volume of the diode will be larger ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M7/483
Inventor 谭国俊刘战李浩何凤有
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO