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Fault isolation device, DC boosting device and inversion device

A fault isolation and self-locking device technology, applied in the direction of converting DC power input to DC power output, circuit devices, emergency protection circuit devices, etc., can solve short-circuit faults that cannot effectively isolate faults, and the application flexibility of fault isolation methods is low, etc. problems, to achieve the effect of improving application flexibility

Inactive Publication Date: 2019-12-13
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] figure 1 The fault isolation of the DC / DC conversion unit is realized through the diode D and the circuit breaker K on the output positive bus and the output negative bus of each DC / DC conversion unit, or the diode D and the fuse. The method is usually applied to the short-circuit fault caused by the reverse connection of the output of the DC / DC conversion unit. For the short-circuit fault caused by other reasons, the fault isolation cannot be effectively carried out. Therefore, the application flexibility of this fault isolation method is low.

Method used

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  • Fault isolation device, DC boosting device and inversion device
  • Fault isolation device, DC boosting device and inversion device
  • Fault isolation device, DC boosting device and inversion device

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Embodiment Construction

[0057] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0058] Before explaining the fault isolation device provided by the embodiment of the present application, the application scenario involved in the embodiment of the present application is explained first.

[0059] With the development of photovoltaic technology, split string inverters are increasingly applied to power supply systems based on photovoltaic technology. The split type string inverter refers to a system composed of two machines, the DC boost device responsible for boosting and the inverter unit responsible for inverting are designed separately. figure 2 It is a schematic structural diagram of a split-type string inverter provided in the embodiment of the present application. like figure 2 As shown, the split stri...

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Abstract

The invention discloses a fault isolation device, a DC boosting device and an inversion device, which belong to the technical field of power supplies. The fault isolation device comprises a controllerand a circuit breaker. When the circuit breaker is located on a bus connected with a certain DC / DC conversion unit, if the voltage acquired by a first voltage acquisition end is a negative value, input or output of the DC / DC conversion unit is indicated to be reversely connected, and at the moment, a circuit breaker is controlled to be disconnected, so that the DC / DC conversion unit can be prevented from being connected in series with other DC / DC conversion units connected in parallel. If the voltage acquired by the first voltage acquisition end is low and the current acquired by a current acquisition end is large, the DC / DC conversion unit is short-circuited, and at the moment, the circuit breaker is controlled to be disconnected, so that the situation in which other assemblies connectedwith the DC / DC conversion unit in series flow back energy to the DC / DC conversion unit can also be avoided.

Description

technical field [0001] The present application relates to the field of photovoltaic technology, in particular to a fault isolation device, a DC booster device and an inverter device. Background technique [0002] In a power supply system based on photovoltaic technology, the DC power generated by photovoltaic cells is first boosted by a DC booster, and then converted into AC power by an inverter unit, and then the converted AC power is sent to the grid. Among them, the DC booster is usually composed of multiple DC / DC (direct current / direct current, DC / DC) conversion units connected in parallel. If any DC / DC conversion unit fails, it may cause other DC / DC conversion units to malfunction. The energy is poured back into the DC / DC conversion unit, causing cascading failures in other DC / DC conversion units. Therefore, it is necessary to study a fault isolation device to isolate the faulty DC / DC conversion unit. [0003] related technologies, such as figure 1 As shown, a reverse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02H7/12
CPCH02H7/1213H02M1/32H02M3/1584H02H3/087H02H3/18H02M3/158
Inventor 张芳坡王均林天散徐厚建
Owner HUAWEI TECH CO LTD
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