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A photovoltaic power generation unit

A photovoltaic power generation and circuit technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of high construction cost and high cost of inverter circuits, reduce the number of use, reduce the amount of high-current cables, and reduce equipment costs. and construction costs

Active Publication Date: 2019-10-15
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a photovoltaic power generation unit that overcomes the defects of high transformer and inverter circuit costs, high equipment costs, and high construction costs in existing photovoltaic power generation units

Method used

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  • A photovoltaic power generation unit
  • A photovoltaic power generation unit
  • A photovoltaic power generation unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as Figure 4 As shown, the photovoltaic power generation unit of the present invention includes a transformer, an inverter, a combiner box and a photovoltaic module connected in sequence. in:

[0041] The combiner box is electrically connected with the photovoltaic module. The combiner box can adopt circuit structures including but not limited to:

[0042] (1) A combiner box composed of multiple diode collection circuits (such as Figure 8a shown);

[0043] (2) A combiner box composed of multiple DC-DC power conversion circuits (such as Figure 8b shown);

[0044] The above two combiner boxes can be mixed in the same photovoltaic power generation system. This embodiment adopts a combiner box composed of multiple diode collecting circuits.

[0045] The inverter includes a controller and an inverter bridge. The inverter bridge can adopt circuit structures including but not limited to the following:

[0046] (1) Two-level three-phase power conversion circuit ...

Embodiment 2

[0058] Such as Figure 5 As shown, the difference between this embodiment and the embodiment is only that: as an example, according to the needs of the photovoltaic power generation unit, the voltage level of the high-voltage side winding of the transformer can be set at 20kV, and the voltage level of various low-voltage side windings can be set at 500V. The inverter bridge adopts a T-type three-level three-phase power conversion circuit. The combiner box is composed of a DC-DC power conversion circuit.

Embodiment 3

[0060] Such as Figure 6 As shown, the difference between the present embodiment and the first embodiment only lies in:

[0061] (1) The voltage sampling circuit set at the signal interface of winding B on the low-voltage side is connected to the controller through the filter circuit.

[0062] (2) The inverter bridge of the inverter adopts an I-type three-level three-phase power conversion circuit, and uses the power interface and leakage inductance to realize AC-DC energy conversion, and utilizes the leakage inductance of low-voltage side winding A and low-voltage side winding B and The filter capacitor connected to the low-voltage side winding B implements grid-side current filtering. At this time, the leakage inductance per unit of the low-voltage side winding A and the low-voltage side winding B can be set to be greater than or equal to 5% respectively. Setting the filter capacitor connected to the low-voltage side winding B can strengthen the grid-side current filtering...

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PUM

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Abstract

The invention discloses a photovoltaic power generation unit. The photovoltaic power generation unit comprises a transformer, an inverter, a convergence box and a photovoltaic module which are sequentially connected, wherein the inverter comprises a controller and an inversion bridge, one end of the inversion bridge is connected with the transformer, the other end of the inversion bridge is connected with the convergence box, a high-voltage side winding of the transformer is connected with an external power grid by a high-voltage side switch, a low-voltage side winding of the transformer comprises a low-voltage side winding A providing a power interface, a leakage inductance per-unit value corresponding to the low-voltage side winding A is greater than or equal to 5%, the low-voltage side winding A is connected with the inversion bridge by the power interface and a low-voltage side switch, the inverter comprises a voltage sampling circuit, the voltage sampling circuit is connected with the controller and is arranged on the high-voltage side winding of the transformer, or the low-voltage side winding of the transformer comprises a low-voltage side winding B providing a signal interface, and the voltage sampling circuit is arranged on the signal interface of the low-voltage side winding B. By the photovoltaic power generation unit, the circuit cost, the device cost and the construction cost of the photovoltaic power generation unit are reduced.

Description

technical field [0001] The invention relates to a photovoltaic power generation unit. Background technique [0002] Such as figure 1 As shown, the existing photovoltaic power generation unit generally includes a transformer, an inverter, a combiner box and a photovoltaic module connected in sequence. The transformer generally includes a high-voltage side switch, a transformer body and a low-voltage side switch; the transformer body is composed of a high-voltage side winding and a low-voltage side winding, the high-voltage side winding is connected to the external power grid through the high-voltage side switch, and the low-voltage side winding is connected to the inverter connected. Inverters generally include controllers, inverter bridges, low-voltage switches, and grid-side filters. The inverter bridge is composed of power semiconductor devices, and the grid-side filter is composed of filter inductors and filter capacitors. One end of the inverter bridge is connected to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 周党生盛小军
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD