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Method for judging efficiency anomaly alarms of photovoltaic system

A photovoltaic system and efficiency technology, applied in the field of photovoltaic systems, can solve the problems of abnormal photovoltaic system components, unsuitable monitoring and alarm instantaneous efficiency calculation, failure and so on

Active Publication Date: 2014-11-26
HOHAI UNIV CHANGZHOU
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Problems solved by technology

From the perspective of the overall trend throughout the year, taking the Yangtze River Delta region as an example, in the rainy season in June, due to the impact of low radiation, the system efficiency value is greatly reduced compared with other months
At present, from the process of data collection and calculation, it is found that the calculation of PR value is greatly affected by light intensity and ambient temperature, and the general calculation period of PR is 1 year, which is not suitable for the calculation of instantaneous efficiency used in monitoring and alarming.
[0003] During the operation of the photovoltaic system, there will be problems such as abnormal components, performance attenuation, and failure.

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  • Method for judging efficiency anomaly alarms of photovoltaic system
  • Method for judging efficiency anomaly alarms of photovoltaic system
  • Method for judging efficiency anomaly alarms of photovoltaic system

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Embodiment Construction

[0051] The present invention will now be described in detail in conjunction with the accompanying drawings and specific embodiments.

[0052] Such as figure 2As shown, the photovoltaic system efficiency abnormal alarm judging method of the present invention is shown in the flow chart, including the following steps:

[0053] 1) Divide the efficiency of the photovoltaic power station system into three sections: the efficiency of the DC section, the efficiency of the low-voltage AC section, and the efficiency of the high-voltage AC section. Among them, the efficiency loss of the DC section includes component spectral mismatch, high temperature loss, shadow, dust loss, DC line loss, current and voltage mismatch loss, etc. Efficiency loss in the low-voltage AC section includes MPPT loss, DC / AC inverter loss, AC line loss, and so on. High-voltage AC loss includes AC boost loss, high-voltage AC line loss, etc.

[0054] 2) Considering the loss of photovoltaic efficiency, set the t...

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Abstract

The invention discloses a method for judging efficiency anomaly alarms of a photovoltaic system. According to the method, the problems of a PR value computational formula at present are analyzed, correction is conducted according to the environment temperature and the radiation strength at different periods, then the corrected practical efficiency of a direct-current section of the photovoltaic power station system is compared with the set theoretical efficiency of a photovoltaic power station installation area, an alarm grading standard is set according to the efficiency difference, alarm grades are determined, and the early warning is conducted. By means of the method, the accurate basis is provided for monitoring of the performance and daily operation maintenance of the photovoltaic system.

Description

technical field [0001] The invention relates to a method for judging the abnormal efficiency alarm of a photovoltaic system, which belongs to the technical field of photovoltaic systems. Background technique [0002] The efficiency of a photovoltaic system is a standard to measure the performance of a photovoltaic system. The total efficiency of a photovoltaic system consists of the efficiency of the solar array (the ratio of DC output power to the total installed capacity), the efficiency of the inverter (the ratio of AC output power to DC input It consists of three parts: the ratio of electric power), and the efficiency of the grid-connected terminal. In order to measure the efficiency of a photovoltaic system more directly, Performance Ratio (PR for short) is generally used internationally as a standard for measuring the efficiency of a photovoltaic system. PR usually represents the efficiency of the photovoltaic system, which is a measure of the utilization degree of th...

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Application Information

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IPC IPC(8): H02S50/00
CPCY02E10/50
Inventor 张臻王磊马骜骐赵凤阁
Owner HOHAI UNIV CHANGZHOU
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