Five-level H-bridge converter and pre-charging method thereof

A converter, five-level technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as large stray inductance and damage to switching devices, and achieve high power Effect of density, voltage spike and oscillation reduction, high reliability

Inactive Publication Date: 2019-12-20
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of converter is used in high-voltage occasions, often due to the long line, the stray inductance on the line is very large, which will cause specific switching devices (switching dev

Method used

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  • Five-level H-bridge converter and pre-charging method thereof
  • Five-level H-bridge converter and pre-charging method thereof
  • Five-level H-bridge converter and pre-charging method thereof

Examples

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Example Embodiment

[0028] Such as image 3 with Figure 4 As shown, the five-level H-bridge converter of the embodiment of the present invention consists of a control unit (not shown in the figure), controlled switching devices S1 to S12 and their anti-parallel diodes D1 to D12, and supporting capacitor banks Cd1 and Cd2 , Flying capacitor Cf, absorption circuit and load (Open-Winding Load), the controlled switching device is driven by the control unit.

[0029] The five-level H-bridge converter of the present invention includes three single-phase H-bridge inverters. Each single-phase H-bridge inverter is composed of a left bridge arm and a right bridge arm with the same structure. The input of all bridge arms The terminal is connected to the DC bus, the output terminal is connected to a single-phase resistive load, and the first supporting capacitor Cd1 and the second supporting capacitor Cd2 are connected in series.

[0030] The bridge arm includes a first branch formed by the switching device S1 a...

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Abstract

The invention discloses a five-level H-bridge converter, which is topologically of a five-level H-bridge single-phase output structure, adopts modular design, can form a multi-phase output system, andadopts an absorption loop to effectively reduce voltage spikes and oscillation on a specific switching device. By controlling the switching sequence of the switching devices, in the power-on processof the converter module, a load is connected to a DC bus to carry out segmented pre-charging on a capacitor bank in a circuit, and the current passing through the capacitor bank is prevented from being too large; and when the voltage of each segment of the capacitor bank is detected to reach a preset value, the pre-charging process is ended, the switching tube is controlled to cut off the connection between the load and the DC bus, and the converter enters a normal working mode. In comparison with a circuit topology used by the existing high-voltage five-level converter, the voltage spikes andthe oscillation caused by stray inductance existing in a high-voltage line on a specific switching device can be effectively reduced, capacitor banks in a circuit are effectively pre-charged in a segmented mode, and the voltage of each capacitor bank is controlled.

Description

technical field [0001] The invention belongs to the field of high-voltage and large-capacity power electronic converters such as electric drives and power systems, and specifically relates to a five-level H-bridge converter and a precharging method thereof. Background technique [0002] At present, with the development of high-voltage and large-capacity power electronics technology in the fields of high-voltage power systems and high-power motor control, the topology and control technology of five-level inverters have been widely used. Due to the limited withstand voltage capability of current power electronic devices, in order to realize the function of using low withstand voltage switches to output high voltage, the capacity of the system is usually increased by means of series and parallel connection of power electronic devices or power electronic bridge arm modules. Moreover, compared with the traditional two-level converter, the five-level converter has the characterist...

Claims

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Application Information

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IPC IPC(8): H02M7/487H02M7/5387
CPCH02M7/487H02M7/53871
Inventor 陈雪亮肖霆柳思奇姜钰梁肖烨然
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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