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Photovoltaic unit and realization method thereof

A technology of photovoltaic unit and implementation method, applied in photovoltaic power generation, photovoltaic modules, photovoltaic power stations, etc., to achieve the effects of improving system efficiency, reducing cross-section and loss, and reducing output DC current

Inactive Publication Date: 2015-01-28
AIR ENG DESIGN & RES BUREAU P L A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to solve the problems and deficiencies of the existing photovoltaic unit design, improve the method for determining the number of series connection of photovoltaic modules in the photovoltaic unit, and introduce the atmospheric light transmittance coefficient K c and solar radiation resource area coefficient K r , so that the determination of the number of photovoltaic modules is more accurate, the output voltage of the adjusted photovoltaic unit is more suitable, and it can better meet the requirements of engineering design, and then can be vigorously promoted and used, and the power generation efficiency of photovoltaic power plants that the country has vigorously built has been further improved. improve

Method used

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  • Photovoltaic unit and realization method thereof
  • Photovoltaic unit and realization method thereof

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1 The photovoltaic unit and its implementation method

[0061] The photovoltaic unit in the photovoltaic power station includes a photovoltaic module, a controller, and a connection circuit; the controller and the connection circuit are connected to each other, and the connection circuit is connected to a plurality of the photovoltaic modules; the controller is connected to each other through the connection circuit Controlling the series connection of the photovoltaic modules, the controller can also adjust the number of series connection of the photovoltaic modules according to environmental changes; the realization method of the photovoltaic unit is realized according to the following steps:

[0062] Step 1: Determine the type of photovoltaic power station, and distinguish the grid-connected photovoltaic power station, the off-grid photovoltaic power station with the solar maximum power point tracking control function of the photovoltaic charge controller, a...

Embodiment 2

[0077] A photovoltaic power station is a grid-connected photovoltaic power station, which is located in the suburbs of a plain city. The solar radiation resource area is grade IV, and the air pollution is serious. The gas phase observation data is C TSP =380mg / m 3 , first calculate K according to equations (3) and (4) c 、K r :

[0078] K c =(1-10 -(e+1) C TSP )×100% (3)

[0079] Solar radiation resource area level I: K r =1.00

[0080] Solar radiation resource area class II: K r =0.99

[0081] Solar Irradiation Resource Area Class III: K r =0.95

[0082] Solar Irradiation Resource Area Class IV: K r =0.93 (4)

[0083] get K c = 92.73%; K r = 0.93.

[0084] The maximum system voltage V allowed to be carried by the photovoltaic unit of the power station s 880V, the maximum DC input voltage V allowed by the inverter connected to the photovoltaic unit in is 1000V, so min(V s , V in ) take V s , is 880V; the open-circuit voltage V output by a single photovoltai...

Embodiment 3

[0091]A photovoltaic power station is an off-grid photovoltaic power station with a photovoltaic charge controller that has the function of tracking and controlling the maximum power point of solar energy. It is located on the Inner Mongolia Plateau. The solar radiation resource area is grade II, and the air pollution is relatively slight. The gas phase observation data is measured C TSP =120mg / m 3 , first calculate K according to equations (3) and (4) c 、K r :

[0092] K c =(1-10 -(e+1) C TSP )×100% (3)

[0093] Solar radiation resource area level I: K r =1.00

[0094] Solar radiation resource area class II: K r =0.99

[0095] Solar Irradiation Resource Area Class III: K r =0.95

[0096] Solar Irradiation Resource Area Class IV: K r =0.93 (4)

[0097] get K c = 97.70%; K r = 0.99.

[0098] The maximum system voltage V allowed to be carried by the photovoltaic unit of the power station s 960V, the maximum DC input voltage V allowed by the photovoltaic charge ...

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Abstract

Provided is a realization method of a photovoltaic unit. First, the type of a photovoltaic power station is distinguished; for a grid-connected photovoltaic power station or an off-grid photovoltaic power station of which a photovoltaic charging controller has a solar maximum power point tracking control function, the maximum limit value Ns of the number of photovoltaic components connected in series in a photovoltaic unit is calculated according to a formula (as shown in the description), and the value of the number of the photovoltaic components connected in series is Ns; for an off-grid photovoltaic power station of which a photovoltaic charging controller does not have a solar maximum power point tracking control function, the minimum limit value Nm of the number of photovoltaic components connected in series in a photovoltaic unit is calculated according to a formula (as shown in the description), and the value of the number of the photovoltaic components connected in series is Nm; the photovoltaic unit comprises photovoltaic components, a controller and a connecting circuit, the controller and the connecting circuit are connected to each other, and the connecting circuit and the photovoltaic components are connected to each other; and the controller can control series connection of the photovoltaic components according to the change of the environment through the connecting circuit. The method of the invention can avoid the design defects on the number of photovoltaic components connected in series and improve the power generation efficiency of the photovoltaic power station.

Description

technical field [0001] The invention relates to a photovoltaic unit and a realization method thereof, and belongs to the technical field of design of photovoltaic units in photovoltaic power plants. Background technique [0002] Photovoltaic power generation is recognized as the most promising new energy technology. The photovoltaic unit converts the received solar energy into electrical energy, and the photovoltaic unit has the maximum system voltage allowed to carry, the photovoltaic inverter has the maximum DC input voltage allowed to carry, and the off-grid photovoltaic power station has the floating charge voltage of the battery that is constantly changing , whether the photovoltaic charge controller has the function of tracking the maximum power point of solar energy, the voltage drop during the current transmission process, and the atmospheric light transmittance and solar radiation altitude level of the photovoltaic power plant location...how to base on the above fac...

Claims

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Application Information

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IPC IPC(8): H02S10/00H02S50/00
CPCH02S10/00H02S40/00Y02E10/50
Inventor 俞晟罗继杰罗刚
Owner AIR ENG DESIGN & RES BUREAU P L A
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