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Combined converter and control method thereof

A control method and converter technology, applied in AC network circuits, wind power generation, electrical components, etc., can solve the problems of limited mechanical life and electrical life of frame circuit breakers

Active Publication Date: 2018-11-16
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the inventors found that the mechanical life and electrical life of the frame circuit breaker are limited. In the actual grid-connected operation, it is necessary to reduce the number of disconnection of the converter, that is, reduce the number of times the frame circuit breaker operates

Method used

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  • Combined converter and control method thereof
  • Combined converter and control method thereof

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Embodiment Construction

[0055] see figure 1 , figure 1 A schematic structural diagram of a combined converter provided by an embodiment of the present invention, the combined converter includes a frame circuit breaker 11 and at least two converters 12 . Wherein, each converter 12 includes an AC grid side 121 , a DC side 122 , an AC motor side 123 , a first contactor 124 and a second contactor 125 .

[0056] Specifically, the connection relationship of each device in the combined converter is:

[0057] The grid-side AC output terminal 121 of each converter 12 is connected to one end of the frame circuit breaker 11 through the first contactor 124, and the other end of the frame circuit breaker 11 is connected to the grid;

[0058]The AC motor side 123 of each converter 12 is electrically connected to the generator 13 through the second contactor 125;

[0059] The DC sides 122 of the plurality of converters 12 are all connected in parallel through the third contactor 126 .

[0060] It can be seen fr...

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Abstract

An embodiment of the invention provides a combined converter and a control method thereof. The combined converter comprises a frame circuit breaker and at least two converters, wherein each convertercomprises an AC grid side, a DC side, an AC motor side, a first contactor and a second contactor. According to the combined converter, through controlling the on-off state of the first contactor, thesecond contactor and the third contactor, the accessing state of each converter is individually controlled, and system redundancy is improved. Furthermore the frame circuit breaker can be always in anoff state, thereby reducing the number of on-off times of the frame circuit breaker and furthermore prolonging service life of the frame circuit breaker. Furthermore, because the converters of a plurality of accessing systems are parallelly connected through the third contactor, circulating current among the converters is lowered.

Description

technical field [0001] The invention relates to the technical field of new energy motor control, in particular to a combined converter and a control method. Background technique [0002] The converter is a device commonly used in the power generation system to convert the AC power on the grid side into DC power, and then convert the DC power into AC power on the motor side. It includes a plurality of parallel semiconductor switches. - Conversion of direct current. Specifically, the semiconductor switch may be a device having a switching function such as an IGBT, an IGCT, and an IEGT. [0003] As the power requirements of the power generation system become higher and higher, usually the AC sides of multiple converters are connected in parallel to meet the larger power requirements. However, the AC side of multiple converters is directly connected in parallel, and the DC side is not paralleled. In order to make the system redundant, a frame circuit breaker is installed on th...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/386H02J3/38Y02E10/76
Inventor 汪令祥周俭节
Owner SUNGROW POWER SUPPLY CO LTD
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