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Protective device for photovoltaic power generation system

A photovoltaic power generation system and protection device technology, applied in the direction of protection against overcurrent, etc., can solve the problems of inability to play a protective role, potential safety hazards, and high cost, achieve reliable protection, improve working life, and suppress surge impact. the effect of the ability

Inactive Publication Date: 2014-02-19
SINENG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the same way, the use of fuses at the input of the inverter can be analyzed. Due to the "current-limiting" characteristics of the battery module input, this use will not be able to play a protective role in most working conditions.
To sum up, due to the current source characteristics of the solar panel, the traditional power supply using a fuse or an air switch for protection is almost ineffective, thus causing a great safety hazard to the normal application of the system
It is necessary to take special protection measures, such as using an air switch with shunt tripping function, etc., to achieve the purpose of system protection through the auxiliary judgment of the control circuit, and the cost is high

Method used

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  • Protective device for photovoltaic power generation system
  • Protective device for photovoltaic power generation system
  • Protective device for photovoltaic power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.

[0022] In practical applications, the overcurrent protection device includes a fuse and an air switch, and the energy storage element includes a capacitor element and an energy storage battery. like Figure 4 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1 is a simplified photovoltaic module array, 401 is a combiner box, 402 is a photovoltaic inverter, fuse F1+, fuse F1-, and capacitor C1 are installed in the combiner box 401, and fuse F and capacitor C2 are...

Embodiment 2

[0025] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.

[0026] like Figure 5 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1-PVArayn are all photovoltaic module arrays, 501 is a combiner box, at the output end of each group of photovoltaic modules, that is, the input end of combiner box 501, fuses are connected in series, and capacitors are connected in parallel between positive and negative electrodes.

[0027] Because the internal resistance of the capacitor is very small, it can be regarded as a voltage sourc...

Embodiment 3

[0029] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.

[0030] like Figure 6 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1-PVArayn are all photovoltaic components, 601 is a combiner box, only the output terminal of combiner box 601 has added capacitance.

[0031] It can be analyzed that when there is a short circuit at the CD end, it can still play an effective protective role. In addition, when a short-circuit fault occurs on the input side of the photovoltaic inverter in the subsequent stage, due to the exi...

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Abstract

The invention discloses a protective device for a photovoltaic power generation system. The protective device comprises an overcurrent protection unit and an energy storing component, wherein the overcurrent protection unit is connected in series between a photovoltaic assembly and the dc side of a photovoltaic inverter, and the energy storing component is connected in parallel between the photovoltaic assembly and the dc side of the photovoltaic inverter. According to the protective device, the energy storing component is connected in parallel between the photovoltaic assembly and the dc side of the photovoltaic inverter, so that a current source characteristic of a solar cell panel is converted into a voltage source characteristic; when a short-circuit fault occurs in the photovoltaic power generation system, energy stored in the energy storing component can be used to reliably fuse the overcurrent protection unit; such protection is almost not limited by the energy input into the solar cell panel, and can be reliably realized even light is very weak; and the scheme is simple, and protection is reliable.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a protection device for a photovoltaic power generation system. Background technique [0002] A photovoltaic inverter is a device that converts the DC power of a solar panel into AC power. Today, when energy is increasingly scarce, demand is increasing, and the concept of environmental protection is deeply rooted in the hearts of the people, solar energy has attracted widespread attention due to its advantages of simple acquisition, cleanness, pollution-free, and inexhaustibility, and has also been widely used in countries all over the world. Solar photovoltaic power generation is a process in which the DC power generated by solar panels is converted into AC power through inverters and other conversion devices and sent to the grid. like figure 1 As shown, from the characteristics of the volt-ampere curve of the solar panel, there are four main characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
Inventor 刘洋
Owner SINENG ELECTRIC CO LTD
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