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Bypass system and method for cascaded multilevel converters

A technology of cascading multi-level and bypass systems, which is applied in the direction of converting irreversible DC power input into AC power output, and can solve problems such as system cost increase

Active Publication Date: 2019-05-31
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is completed in order to solve the above-mentioned deficiencies in the prior art. The purpose of the present invention is to propose a bypass system and method for cascaded multilevel converters. The switching device prevents the cascaded multilevel converter from blocking the output AC current, which leads to the problem of increasing system cost

Method used

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  • Bypass system and method for cascaded multilevel converters
  • Bypass system and method for cascaded multilevel converters
  • Bypass system and method for cascaded multilevel converters

Examples

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Embodiment 1

[0041] image 3 It is a schematic structural diagram of the bypass system of the cascaded multilevel converter provided by Embodiment 1 of the present invention.

[0042] like image 3 As shown, a cascaded multilevel converter bypass system provided by Embodiment 1 of the present invention includes a cascaded multilevel converter 100 and a control unit 200;

[0043] Wherein, the cascaded multilevel converter 100 includes at least two cascaded conversion circuits 110, among the at least two conversion circuits 110, the first output terminals and the second output terminals of adjacent conversion circuits 110 are electrically connected in sequence, Each conversion circuit 110 includes a plurality of switch tubes.

[0044] In addition, the conversion circuit 200 is provided in a one-to-one correspondence with the external DC source 300 and electrically connected, and the DC source 300 is used to provide DC power to the corresponding conversion circuit 110 .

[0045]The control...

Embodiment 2

[0048] Figure 4 It is a schematic structural diagram of the conversion circuit in the bypass system of the cascaded multilevel converter provided by Embodiment 2 of the present invention. like Figure 4 As shown, the above at least two conversion circuits 110 each include: a first capacitor 1121 , a first switch tube 1122 , a second switch tube 1123 , a third switch tube 1124 and a fourth switch tube 1125 .

[0049] Wherein, the first end of the first switch tube 1122 is electrically connected to the first end of the second switch tube 1123, the first end of the first capacitor 1121 and the positive pole of the DC source 300 respectively;

[0050] The second end of the first switch tube 1122 is electrically connected to the first end of the third switch tube 1124 and the first output end of the conversion circuit 110 respectively;

[0051] The second end of the second switch tube 1123 is electrically connected to the first end of the fourth switch tube 1125 and the second o...

Embodiment 3

[0063] Different from the first embodiment above, in the bypass system of the cascaded multilevel converter provided by the third embodiment of the present invention, the control unit therein may include a plurality of control sub-modules corresponding to the conversion circuits one-to-one. Image 6 A schematic structural diagram of a bypass system of a cascaded multilevel converter provided in Embodiment 3 of the present invention. like Image 6 As shown, the control unit 200 may include a processor 220 and at least two control sub-modules 210, each control sub-module 210 corresponds to the conversion circuit 110 one by one, and is electrically connected to the corresponding conversion circuit 110 and the DC source 300 respectively, The control sub-module 210 is used to collect the status information of the corresponding conversion circuit 110 and the DC source 300 and send it to the processor 220. The processor 220 confirms the working status of the corresponding conversion ...

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Abstract

The invention discloses a bypass system for a cascade multilevel converter. The bypass system comprises the cascade multilevel converter and a control unit, wherein the cascade multilevel converter comprises at least two conversion circuits which are cascaded; first output ends and second output ends of the adjacent conversion circuits are electrically connected in sequence; the conversion circuits are in one-to-one correspondence and electrically connected with external DC sources; and the control unit is respectively and electrically connected with the at least two conversion circuits, and is used for acquiring state information of the at least two conversion circuits and the corresponding DC sources, confirming operating states of the at least two conversion circuits and the corresponding DC sources according to the state information, and controlling at least one switching tube in the conversion circuits to be switched on or off so as to bypass the conversion circuits and the corresponding DC sources. The bypass system and the bypass method for the cascade multilevel converter disclosed by the invention utilize the control unit to control the switching on / off state of the switching tube in the conversion circuits, can guarantee normal operation of the cascade multilevel converter when abnormal situation of the conversion circuits or the DC sources occurs, and save the cost.

Description

technical field [0001] The invention relates to the field of cascaded multilevel converters, in particular to a bypass system and method for cascaded multilevel converters. Background technique [0002] Cascaded multilevel converters are widely used in applications such as power conversion, high-voltage variable frequency drive, high-voltage direct current transmission, and reactive power compensation. They are generally composed of single-phase switching bridges or half-bridge inverter systems connected in series. [0003] figure 1 is a schematic structural diagram of a cascaded multilevel converter in the prior art. like figure 1 As shown, the cascaded multilevel converter 10 includes several conversion circuits 11, and the several conversion circuits 11 are connected in cascaded form. However, this structure has certain shortcomings. When a conversion circuit or its electrically connected DC source 20 is abnormal, the output AC current of the entire cascaded multilevel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/49
Inventor 刘宝其肖永利薛丽英曾志槐
Owner SUNGROW POWER SUPPLY CO LTD
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