Pre-charging circuit, control method thereof and converter

A pre-charging circuit and pre-charging voltage technology, applied in electrical components, output power conversion devices, etc., can solve the problems of large loss of pre-charging resistance, and the charging voltage of the DC bus cannot reach the rated voltage, so as to avoid current impact and realize The effect of automatic inspection and smooth pre-charge voltage

Active Publication Date: 2018-09-07
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing pre-charging method has problems such as large pre-charging resistance loss, DC bus charging voltage cannot reach the rated voltage, and current impact cannot be avoided when the AC switch on the grid side is closed.

Method used

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  • Pre-charging circuit, control method thereof and converter
  • Pre-charging circuit, control method thereof and converter
  • Pre-charging circuit, control method thereof and converter

Examples

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Embodiment Construction

[0020] The present invention may have various modifications and various embodiments, and it should be understood that the present invention is not limited to these embodiments, but includes all modifications, equivalents and replacements within the spirit and scope of the present invention. For example, the order of operations described herein are examples only, and are not limited to those orders set forth herein, but, except for operations that must occur in a particular order, may be as would be after understanding the disclosure of the present application. Clearly changed that way. Also, descriptions of features that are known in the art may be omitted for increased clarity and conciseness. The terms used in the example embodiments of the present invention are for describing specific embodiments only, and are not intended to limit the example embodiments. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly dictat...

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PUM

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Abstract

The invention provides a pre-charging circuit, a control method thereof and a converter. The pre-charging circuit includes a first capacitor bank, a second capacitor bank, at least one pair of path switching circuits including a first path switching circuit and a second path switching circuit, and a charging power supply circuit. When the pre-charging voltages of the first capacitor bank and the second capacitor bank do not reach a predetermined value, each pair of path switching circuits are operated sequentially in each pre-charging cycle. The operations include the following steps that: within the first conduction time, a first path of the first path switching circuit and a second path of the second path switching circuit are conducted to charge the first capacitor bank through the charging power supply circuit; after the first conduction time, the first path and the second path are disconnected; and moreover, within the second conduction time, a third path of the first path switching circuit and a fourth path of the second path switching circuit are conducted to charge the second capacitor bank through the charging power supply circuit.

Description

technical field [0001] The following description relates to the technical field of wind power converters, and more specifically, relates to a pre-charging circuit, a control method thereof, and a converter. Background technique [0002] In wind power converters, the DC bus generally adopts a large-capacity capacitor bank for DC support, and provides part of the reactive capacity and output current ripple. Due to the large capacity of the DC capacitor (capacitor bank) and in order to ensure safety, it is necessary to discharge all the charges on the DC capacitor when the wind power converter is shut down. If the DC capacitor is not pre-charged before the converter is started, the DC capacitor will be in a short-circuit state when the AC switch on the grid side is directly closed, and a large short-circuit current impact will be generated at this time, which will affect the inverter. Insulated gate bipolar transistors (IGBTs), DC capacitors and other power semiconductor devic...

Claims

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Application Information

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IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 符松格
Owner BEIJING ETECHWIN ELECTRIC
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