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Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method

A low-voltage ride-through and auxiliary power supply technology, applied in photovoltaic power generation, circuit devices, electrical components, etc., can solve the problems of lack of reliable shutdown function and high cost, and achieve the effect of simple structure, accurate timing and cost reduction.

Active Publication Date: 2015-04-01
SHENZHEN ACAD OF AEROSPACE TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem solved by the present invention is to provide a photovoltaic grid-connected inverter low-voltage ride-through auxiliary power supply device and method, which overcomes the technical problem of high cost due to lack of reliable shutdown function in the prior art

Method used

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  • Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method
  • Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method
  • Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0022] Such as figure 1 As shown, the specific implementation mode of the present invention is: when the power grid side is normal, the auxiliary source of the present invention takes power from 220VAC on the AC side; Provided to other DC / DC modules and electrical equipment. When the grid fault is of the type specified by low voltage ride through, the auxiliary source will take power from the AC grid again after the grid is restored, and when the grid fault exceeds the recovery time specified by low voltage ride through, the auxiliary source will complete off-grid in the inverter control system Actively shut down the power supply after the action, and restart work after the power grid is restored.

[0023] Such as figure 1 , figure 2 As shown, the specific embodiment of the present invention is to construct a photovoltaic grid-connected inver...

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Abstract

The invention relates to a photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device and a method, and the device includes an alternative current electricity-taking circuit, a direct current electricity-taking circuit and a delay deenergizing circuit. Aiming at the defect that the electricity-taking time of the direct current bus is very short, the part of the circuit is in a way of simulating power supply, the circuit structure is simple, and the cost is reduced. Meanwhile, the active close of an auxiliary source is in a way of delay closing, and a comparator and a digital controller are unnecessary to participate in the process, so that no extra low-voltage auxiliary power supply is necessary; the photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device is simple in structure, precision in timing and high in reliability, guarantees reliable work of the ride-through function of the low-voltage inverter, and further reduces the product cost.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected inverter, in particular to a device and method for providing auxiliary power supply during low-voltage ride-through of a photovoltaic grid-connected inverter. Background technique [0002] In the process of photovoltaic grid-connected power generation, especially in large-scale photovoltaic power plants, photovoltaic inverters should have low-voltage ride-through capabilities to avoid detachment when the grid voltage is abnormal, causing instability of the grid power supply, that is, when the grid failure or disturbance causes grid-connected point When the voltage drops, within the range of the voltage drop, the photovoltaic generator set can run uninterruptedly connected to the grid. When the voltage on the AC side of the inverter drops to 20% of the nominal voltage, the inverter can guarantee uninterrupted grid-connected operation for 1 second; when the voltage on the AC side of the inverter can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06
CPCY02B10/72Y02E10/566Y02B10/70Y02E10/56
Inventor 张斌张博温张东来张华
Owner SHENZHEN ACAD OF AEROSPACE TECH
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