Solid-state transformer fault processing system
A solid-state transformer and processing system technology, applied in the field of power electronics, can solve problems such as damage to bus capacitors, and achieve the effects of improving reliability, reducing size and cost, and avoiding further spread of faults
Pending Publication Date: 2022-01-25
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
If the auxiliary source is damaged, the charge consumption of the damaged cascade unit bus capacitor is very small when the medium voltage is powered on, so that the bus voltage of the cascade unit increases and the bus capacitor is damaged
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[0047] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intervening element at the same time. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present.
[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0049] Please refer to figure 1 , figure 1 It is a schematic diagram of the cascaded system architecture of the solid-st...
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The invention provides a solid-state transformer fault processing system, and the system comprises a first power unit and a second power unit which are in cascade connection; the first power unit comprises a first auxiliary source, a first control module and a first communication module, and the first auxiliary source and the first control module are electrically connected with the two ends of a first bus capacitor; the first control module detects the voltage of the first bus capacitor; the second power unit comprises a second auxiliary source and a second control module, the second auxiliary source and the second control module are electrically connected with the two ends of the second bus capacitor, and the first communication module outputs fault information to the second control module when the first control module detects that the voltage of the first bus capacitor is larger than a threshold value, so that the second auxiliary source is closed when the fault information is received. According to the embodiment of the invention, when any cascaded power unit has a fault, the normal power unit can close the self auxiliary source, the bus capacitor voltage of the fault power unit is reduced, and the bus capacitor voltage of the fault unit is ensured to be within a safe range.
Description
technical field [0001] The present application relates to the technical field of power electronics, in particular to a solid-state transformer fault processing system. Background technique [0002] As the basic equipment of the power system, the traditional power transformer cannot realize DC voltage conversion. In recent years, with the rapid development of power electronics technology, solid-state transformers have received extensive attention as a new type of transformer. In addition to the advantages of small size, solid-state transformers can also complete tasks such as power quality management and new energy access, and can be used as key equipment for voltage conversion and energy management in DC power grids, so they have become a current research hotspot. [0003] The medium-voltage auxiliary source of the solid-state transformer can adopt a distributed structure, and the auxiliary source is powered by the bus bar of each cascaded unit. If the auxiliary source is ...
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IPC IPC(8): H02M1/32H02M7/04
CPCH02M1/32H02M7/04H02M1/0074H02M1/007H02M1/0006H02M3/04H02M7/4833H02M7/49H02H1/0007H02H7/04
Inventor 任标刘鑫
Owner HUAWEI DIGITAL POWER TECH CO LTD