Method for online detection and assessment of photovoltaic system

A technology for photovoltaic systems and photovoltaic arrays, applied in photovoltaic system monitoring, photovoltaic power generation, photovoltaic modules, etc., can solve problems such as not providing MPPT efficiency indicators

Active Publication Date: 2016-03-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

However, since there is no reliable instrument to measure MPPT efficiency at present, and it is not necessary to measure MPPT efficiency during inverter certification, most manufacturers do not

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  • Method for online detection and assessment of photovoltaic system
  • Method for online detection and assessment of photovoltaic system
  • Method for online detection and assessment of photovoltaic system

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[0082] The present invention will be further described below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for ease of description, the drawings only show a part but not all of the content related to the present invention.

[0083] The method of the present invention for online detection and evaluation of photovoltaic system efficiency is suitable for independent and grid-connected photovoltaic systems with the MPPT maximum power tracking function, wherein the grid-connected photovoltaic system is such as figure 1 with figure 2 Shown, including string-connected photovoltaic system and centralized grid-connected photovoltaic system. Normally, the MPPT function of the photovoltaic system is integrated in the inverter, but some are also set in the smart combiner box or independent device. ...

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Abstract

The invention discloses a method for online detection and assessment of a photovoltaic system, comprising steps of starting up a voltage-current scanning function through an MPPT function in a photovoltaic system, enabling output voltage of a photovoltaic array which is received by the MPPT to be from minimum working voltage state to an open circuit state or from the open circuit state to the minimum working voltage state, detecting the current value and the voltage value of the MPPT of each path in the process, collecting physic quantities of the corresponding moment like the solar radiation, environment temperature, photovoltaic assembly temperature, wind speed, wind direction, etc, utilizing collected data to adopt a fitting method to establish a photovoltaic power calculation model, combining and utilizing leave factory parameters of the photovoltaic assembly or an initial photovoltaic power calculation model which is established by a PVsyst database, and calculating energy efficiency indexes of each link and obtaining an energy efficiency analysis result after the faulted time frame is eliminated. The invention realizes the online detection of various physic parameters of the photovoltaic system, the photovoltaic array modeling and calculation and analysis of the energy efficiency index of each link.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation systems, in particular to a method for online detection and evaluation of the efficiency of photovoltaic systems. Background technique [0002] Solar photovoltaic power generation is currently the main form of renewable energy power generation, and it is also the dominant energy supply body in the future. At present, my country's subsidies for photovoltaic power generation have changed from the original installed capacity subsidies to electricity price subsidies. Therefore, the power generation of the photovoltaic system throughout its life cycle has become the most important factor affecting the economic benefits of photovoltaic power plants. However, some solar photovoltaic power plant projects in my country currently have problems such as low quality and low power generation efficiency. At the same time, there are no clear standards and access thresholds for the comprehensive q...

Claims

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Application Information

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IPC IPC(8): H02S50/00H02J3/38
CPCH02J3/385H02S50/00Y02E10/56Y02P80/20
Inventor 黄磊舒杰张继元王浩吴昌宏吴志锋
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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