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Anti-disaster photovoltaic power generation system

A photovoltaic power generation system, photovoltaic array technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve problems such as increasing costs, and achieve the effects of single load, high stability, and cost reduction

Inactive Publication Date: 2012-10-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) A dual system of grid-connected inverter and independent inverter is required, which increases the cost;
[0006] 4) When the dual-mode grid-connected inverter is manually switched in the working mode, it will cause a short-term power outage;

Method used

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  • Anti-disaster photovoltaic power generation system
  • Anti-disaster photovoltaic power generation system
  • Anti-disaster photovoltaic power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as image 3 As shown, a disaster-proof photovoltaic power generation system is connected to the grid 5 and the load R o , the system includes a photovoltaic array, a step-up DC converter 1, a charging and discharging device 2, a storage battery 4, a grid-connected inverter 3, a controller 7, and two independent switches S a , S b and two grid-connected switches S 1 , S 2 , the photovoltaic array is connected to the step-up DC converter 1, the step-up DC converter 1 is respectively connected to the charging and discharging device 2 and the grid-connected inverter 3, and the described battery 4 is connected to the charging and discharging device 2, One output terminal of the grid-connected inverter 3 is sequentially connected to the independent switch S a and grid switch S 1 , and the other output terminal is connected to the independent switch S in turn b and grid switch S 2 , independent switch S a , S b respectively connected to the load R o both ends of...

Embodiment 2

[0045] Such as Figure 4 As shown, similar to Embodiment 1, the difference is that the disaster-proof photovoltaic power generation system of this embodiment is provided with an independent switch S a and a grid switch S 1 , one output end of the grid-connected inverter 3 is sequentially connected to the independent switch S a and grid switch S 1 , and the other output terminal is respectively connected to grid 5 and load R o .

[0046] The working principle of the above-mentioned disaster-proof photovoltaic power generation system is as follows:

[0047] (1) Normal state

[0048] Firstly, detect the grid-side voltage signal of the public connection point, implement synchronous grid-connection action, send grid-connection signals relay_1 and relay_2 through the control circuit, and drive the grid-connection switch and the independent switch to close. (If the independent switch is in the closed state, just use the controller to generate the control signal of relay_1)

[...

Embodiment 3

[0061] Such as Figure 5 As shown, similar to Embodiment 1, the difference is that the disaster-proof photovoltaic power generation system of this embodiment is provided with an independent switch S a and a grid switch S 1 , one output terminal of the grid-connected inverter 3 is respectively connected to an independent switch S a and grid switch S 1 , and the other output terminal is respectively connected to grid 5 and load R o .

[0062] The working principle of the above-mentioned disaster-proof photovoltaic power generation system is as follows:

[0063] (1) Normal state

[0064] Firstly, detect the grid-side voltage signal of the public connection point, implement synchronous grid-connection action, send grid-connection signals relay_1 and relay_2 through the control circuit, and drive the grid-connection switch and the independent switch to close. (If the independent switch is in the closed state, just use the controller to generate the control signal of relay_1) ...

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Abstract

The invention relates to an anti-disaster photovoltaic power generation system which is respectively connected with a power grid and a load; the system comprises a photovoltaic array, a booster direct current converter, a charge and discharge device, a storage battery, a grid-connected inverter, an independent switch and a grid-connected switch; the photovoltaic array is connected with the booster direct current converter; the booster direct current converter is respectively connected with the charge and discharge device and the grid-connected inverter; the storage battery is connected with the charge and discharge device; the grid-connected inverter is sequentially connected with the independent switch and the grid-connected switch; the independent switch is connected with the load; the grid-connected switch is connected with the power grid; the system also comprises a controller; the controller is respectively connected with the independent switch and the grid-connected switch; and the controller respectively sends control signals to control the disconnection and the connection of the independent switch and the grid-connected switch. Compared with the prior art, the anti-disaster photovoltaic power generation system has the advantages of no need of switching unit or interface, low cost, high stability, simple structure and the like.

Description

technical field [0001] The invention relates to a power generation system, in particular to a disaster prevention type photovoltaic power generation system. Background technique [0002] Such as Figure 1-Figure 2 As shown, the disaster-proof photovoltaic power generation system usually consists of a photovoltaic array, a step-up DC converter 1, a charging and discharging device 2, a storage battery 4, a grid-connected inverter 3, and a switching unit (automatic and manual), or a grid-connected inverter The parallel system of inverter 3 and independent inverter 6 constitutes. Usually, the power generated by the photovoltaic array is provided to the load or fed into the grid through the grid-connected inverter, and at the same time, the battery works in the charging mode. Once there is a power outage or a disaster occurs, for the disaster-proof photovoltaic power generation system, it is necessary to switch the unit or change the inverter type from the grid-connected mode to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 赵晋斌
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER