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Analysis method of health status of photovoltaic power station system

A photovoltaic power station and health status technology, applied in information technology support systems, instruments, data processing applications, etc., can solve problems such as untimely discovery, system energy loss, and difficulty in identifying slight loss of photovoltaic power station systems

Active Publication Date: 2018-05-08
HOHAI UNIV CHANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, another shortcoming of PR is that it is not easy to identify the slight loss of the photovoltaic power station system
When a small part or a component in a string of the array is bypassed, when the performance of the entire system is still within the normal range of PR evaluation, it will be mistaken for the system to be normal, and the evaluation result does not match the actual state of the system. A problem in the system that causes a continuous loss of energy from the system, which in turn reduces the energy output of the system

Method used

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  • Analysis method of health status of photovoltaic power station system
  • Analysis method of health status of photovoltaic power station system
  • Analysis method of health status of photovoltaic power station system

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Embodiment 1

[0141] Based on a single simulation model, a 4×10 10KW photovoltaic array simulation model is established to obtain the GMM model of the reference state. Select appropriate conditions to conduct experimental analysis of photovoltaic power plants under complex conditions. The measured average irradiance is 426.4W / m2 and the average temperature is 21.9°C.

[0142] The open-circuit and occlusion experiments were carried out respectively, and two levels of occlusion conditions were set, as follows:

[0143] 8:00 to 8:50 are normal conditions;

[0144] 8:50 to 10:00 is the open circuit condition;

[0145] From 10:00 to 11:00, one module in the second string of the array is blocked by PVC light adhesive film;

[0146] From 11:00 to 12:00, the 2 modules in the second string of the array are covered by PVC photoresist film.

[0147] The irradiance of the PVC photoresist film is at least 200W / m2, and the data volume of each group is 100, a total of 24 groups, with a total of 2400 da...

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Abstract

The invention discloses an analysis method of health status of a photovoltaic power station system. Test status parameters and meteorological data are acquired through system collection of a performance test hardware platform of the photovoltaic power station system, and reference status parameters under current irradiation and temperature are calculated and obtained; then preprocessing and feature extraction are respectively carried out on test status and reference status data; two obtained sample parameters are further used to carry out training of Gaussian mixture models (GMMs) to establishthe respective GMMs; then a health index of current status of the photovoltaic power station system is obtained through deviation degree comparison of a reference status model and a test status model; and finally, whether the status of the photovoltaic power station system is abnormal is diagnosed through analysis on the health index, a health level of the system is determined, and abnormal health status is determined. An implementation process of the method is concise and easy to realize, defects existing in traditional evaluation methods are avoided, and the health status of photovoltaic power station system can be more scientifically and reasonably analyzed.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation and operation and maintenance, and in particular relates to a method for analyzing the health state of a photovoltaic power station system. Background technique [0002] During the operation of the photovoltaic power generation system, the output characteristics and operating efficiency of the photovoltaic power plant system will be affected by factors such as photovoltaic module slivers, aging attenuation, shadow occlusion, and dust. performance of the power generation system. In view of these problems, scholars at home and abroad generally attribute these problems to the faults of photovoltaic power generation systems, and have conducted in-depth research on the fault diagnosis of photovoltaic power plant systems. However, some impacts on photovoltaic power generation systems are temporary and recoverable, such as shadows, dust occlusion, etc., and some impacts are caused by the nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q10/00G06Q50/06
CPCG06Q10/0639G06Q10/20G06Q50/06Y04S10/50
Inventor 丁坤陈富东李元良冯莉丁汉祥王越吴佳兵陈翔
Owner HOHAI UNIV CHANGZHOU
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