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Photovoltaic power generation method and system

A photovoltaic power generation system and photovoltaic power generation technology, applied in the field of electric power, can solve the problems of inability to realize photovoltaic power generation and low sunlight luminous flux, and achieve the effects of increasing power generation and prolonging power generation time.

Inactive Publication Date: 2014-11-12
三河市祥天电力工程有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, since the working voltage of the inverter is DC500V-DC820V, when the luminous flux of the sun is low, the voltage input to the inverter may be lower than DC500V, so that the inverter stops working, which in turn causes the luminous flux of the sun to be low. Realize photovoltaic power generation

Method used

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  • Photovoltaic power generation method and system

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Embodiment 1

[0032] like figure 1 As shown, this embodiment provides a photovoltaic power generation method, including:

[0033] Step 101, the detection device acquires the current luminous flux index of sunlight.

[0034] In this embodiment, the luminous flux index in step 101 may be a DC photovoltaic component voltage or a DC photovoltaic component current. Wherein, during the daytime, the detection device can obtain the voltage of the DC photovoltaic module; in the state of weak light such as morning or evening, the detection device can obtain the current of the DC photovoltaic module.

[0035] Step 102, the detection device sends a control signal to the pre-connected photovoltaic combiner box according to the relationship between the luminous flux index and the preset index.

[0036] In this embodiment, step 102 may include: judging whether the luminous flux index is greater than a preset index; if greater, sending a shutdown control signal to the photovoltaic combiner box; if equal,...

Embodiment 2

[0045] like Figure 5 As shown, this embodiment provides a photovoltaic power generation system, including: multiple sets of photovoltaic modules 501 , a detection device 502 , a photovoltaic combiner box 503 , a DC cabinet 504 and an inverter 505 . Among them, the input terminals of the photovoltaic combiner box are respectively connected with multiple sets of photovoltaic modules, and the DC cabinet is connected with the photovoltaic combiner box and the inverter respectively, and the detection device is arranged between the photovoltaic combiner box and the DC cabinet; the detection device is used to obtain the current sunlight The luminous flux index, and according to the relationship between the luminous flux index and the preset index, send a control signal to the photovoltaic combiner box; the photovoltaic combiner box is used to receive the control signal sent by the detection device, and control multiple switches inside it according to the control signal. The connecti...

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Abstract

The invention discloses a photovoltaic power generation method and system and relates to the technical field of electric power. The photovoltaic power generation method and system solve the problem that when light flux of sunlight is low in the prior art, photovoltaic power generation can not be achieved. According to the technical scheme, the photovoltaic power generation method comprises the steps that S10, a detection device obtains a light flux index of current sunlight; S20, the detection device sends a control signal to a photovoltaic combiner box connected with the detection device in advance according to the relation between the light flux index and a preset index; S30, the photovoltaic combiner box controls multiple switches inside the photovoltaic combiner box according to the control signal and adjusts the connection mode between multiple photovoltaic assemblies after receiving the control signal sent by the detection device, and the input end of the photovoltaic combiner box is connected with the photovoltaic assemblies; S40, the output end of the photovoltaic combiner box outputs direct current to an inverter connected in advance through a direct current cabinet, so that the inverter adjusts the direct current and outputs the direct current. Through the scheme, the photovoltaic power generation method and system can be applied to solar power generation systems.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a photovoltaic power generation method and system. Background technique [0002] With the shortage of conventional energy sources, the utilization of solar energy has gradually been paid attention to. The existing photovoltaic power generation system is mainly composed of solar photovoltaic modules, DC cabinets and inverters. The photovoltaic power generation system converts solar energy into direct current through solar photovoltaic modules, and then transfers it to the inverter through the DC cabinet. The inverter The combined DC power is adjusted and provided to users. [0003] However, since the working voltage of the inverter is DC500V-DC820V, when the luminous flux of the sun is low, the voltage input to the inverter may be lower than DC500V, so that the inverter stops working, which in turn causes the luminous flux of the sun to be low. Realize photovoltaic power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S10/00H02S40/36G01R19/257
CPCY02E10/50
Inventor 周荣登周剑
Owner 三河市祥天电力工程有限公司
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