A method for analyzing the health status of photovoltaic power station systems
A photovoltaic power station and health status technology, applied in information technology support systems, data processing applications, instruments, etc., can solve the problems of reducing system energy output, system energy loss, and difficult to identify slight loss of photovoltaic power station system, so as to improve power generation Efficiency, the effect of scientific and reasonable analysis
Active Publication Date: 2021-08-24
HOHAI UNIV CHANGZHOU
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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
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Embodiment 1
[0147] 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.
[0148] The open-circuit and occlusion experiments were carried out respectively, and two levels of occlusion conditions were set, as follows:
[0149] 8:00 to 8:50 are normal conditions;
[0150] 8:50 to 10:00 is the open circuit condition;
[0151] From 10:00 to 11:00, one module in the second string of the array is blocked by PVC light adhesive film;
[0152] From 11:00 to 12:00, the 2 modules in the second string of the array are covered by PVC photoresist film.
[0153] 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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The invention discloses a method for analyzing the health state of a photovoltaic power station system. The test state parameters and meteorological data are obtained through the acquisition system of the performance test hardware platform of the photovoltaic power station system, and the reference state parameters under the current irradiation and temperature are calculated, and then the test conditions are respectively analyzed. The state and reference state data are preprocessed and feature extracted, and the two sample parameters obtained are further trained by the Gaussian mixture model to establish their respective GMM models. Then, by comparing the deviation degree of the reference state model and the test state model, the photovoltaic power plant system is obtained. The health index of the current state; finally, through the analysis of the health index, make a diagnosis of whether the state of the photovoltaic power station system is abnormal, and determine the health level of the system and judge the abnormal health state. The implementation process of the invention is simple and easy to realize, avoids the defects of the traditional evaluation method, and can analyze the health status of the photovoltaic power station system more scientifically and rationally.
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...
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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