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Method and device for detecting power generation efficiency of photovoltaic power generation system

A photovoltaic power generation system and power generation efficiency technology, applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., can solve the problem of not being able to know the operating status of the photovoltaic power generation system power generation equipment in time, and the power generation efficiency of the photovoltaic power generation system without real-time acquisition and calculation way and other issues

Inactive Publication Date: 2016-06-29
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] Embodiments of the present invention provide a method and device for detecting power generation efficiency of a photovoltaic power generation system to solve the problem that there is no real-time acquisition and calculation method for the power generation efficiency of a photovoltaic power generation system in the prior art, resulting in the inability to know the power generation in the photovoltaic power generation system in time Problems with the health of the device

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  • Method and device for detecting power generation efficiency of photovoltaic power generation system

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[0202] The monitoring in step 101 may be to deploy the photovoltaic power generation online monitoring and efficiency evaluation system in a large-scale ground photovoltaic power plant, such as the G026 photovoltaic power generation unit, which can monitor and distribute 5 photovoltaic strings in real time, with a total of 80 photovoltaic modules. And HL030701-HL030716 a total of 16 operating data of photovoltaic strings. At the same time, it can monitor the operation data of the G026-N01 inverter, DC power distribution cabinet and the 7 combiner boxes connected to it. The specific monitoring conditions can be as follows figure 2 shown.

[0203] image 3 It is the efficiency evaluation result of 5 photovoltaic strings monitored in real time by the photovoltaic power plant at a certain time, through image 3 It can be obtained that the power generation efficiency of the group string HL370708 suddenly changes from about 90% to 0% before 11:30. At the same time, the operating...

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Abstract

The invention provides a method and a device for detecting the power generation efficiency of a photovoltaic power generation system, and relates to the technical field of photovoltaic power generation. The method comprises: monitoring operating parameters of an inverter, a direct current distribution cabinet, a combiner box and a photovoltaic string; determining the power generation efficiency of the photovoltaic string, the transmission efficiency of the combiner box, the transmission efficiency of the distribution cabinet and the conversion efficiency of the grid-connected inverter; and determining the power generation efficiency of the photovoltaic power generation system according to the power generation efficiency of the photovoltaic string, the transmission efficiency of the combiner box, the transmission efficiency of the distribution cabinet and the conversion efficiency of the grid-connected inverter. The method and the device solve the problem that when the photovoltaic power generation system runs, only some basic parameters of the photovoltaic power generation system are monitored and measured currently, whereas the power generation efficiency of the photovoltaic power generation system is not acquired or calculated in real time, so that the operating state of power generation equipment in the photovoltaic power generation system cannot be learnt in time.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method and device for detecting power generation efficiency of a photovoltaic power generation system. Background technique [0002] At present, as the global climate problem is getting worse and the contradiction between energy supply and demand is intensifying, countries around the world are adjusting energy policies from the perspective of sustainable development and ensuring energy supply security, and incorporating new energy development into national development strategies. Solar energy has become a renewable energy power generation method because of its abundant resources, inexhaustibility, cleanness and safety. At present, large-scale and distributed grid-connected photovoltaic power plants have been widely used. At present, the power generation of photovoltaic power generation system directly affects the economic benefits of photovoltaic power pl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00
CPCY02E10/50
Inventor 李智白恺宗瑾李娜宋鹏陈豪
Owner STATE GRID CORP OF CHINA
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