Parameter identification based photovoltaic array fault diagnosis method

A photovoltaic array and parameter identification technology, which is applied in photovoltaic power generation, photovoltaic modules, photovoltaic system monitoring, etc., can solve the problems of complex and cumbersome diagnosis process, poor practicability, and low reliability of diagnosis results, so as to reduce the number of sensors and shorten the The effect of cycle time, high confidence and precision

Inactive Publication Date: 2018-01-12
JIANGSU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing diagnostic methods, such as complex and cumbersome diagnostic process, low reliability of diagnostic results, poor pra...

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  • Parameter identification based photovoltaic array fault diagnosis method
  • Parameter identification based photovoltaic array fault diagnosis method
  • Parameter identification based photovoltaic array fault diagnosis method

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] This fault diagnosis system is suitable for such as figure 1 In the photovoltaic array shown, the photovoltaic modules 1 are connected in series to form a string branch, and each string branch is connected in parallel to form a photovoltaic array 6, the array is connected to the combiner box 2, and many combiner boxes 2 are connected to the DC side of the grid-connected inverter 3 The direct current is converted into alternating current by the inverter 3 and input to the grid; each photovoltaic module is connected in parallel with a bypass diode 4 , and each string branch is connected in series with a blocking diode 5 .

[0043] Such as figure 2 As shown, M adjacent photovoltaic modules 1 form a photovoltaic group 7, and the remaining photovoltaic modules 1 that are less than M also form a photovoltaic group 7, and each string branch is divided into several ...

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Abstract

The invention discloses a parameter identification based photovoltaic array fault diagnosis method. The method includes: identifying relevant parameters of a photovoltaic module according to a parameter identification algorithm; acquiring an output characteristic model of the photovoltaic module under different operating conditions; adopting a fault detection algorithm for fault judgment of a photovoltaic group; acquiring an optimal irradiance So and an optimal module temperature To from data acquired by information acquisition equipment, and inputting into the output characteristic model to obtain an optimal output characteristic equation of the current photovoltaic module, inputting branch current acquired by the information acquisition equipment into the optimal output characteristic equation to obtain an optimal output voltage of a current group, comparing with an actual voltage value of the group, and determining that the group has a hard shadow fault if a difference value exceedsa threshold for consecutive F times; judging a fault type according to a fault judging algorithm; displaying three-section positioning data and operating data of the faulted group on a user interfaceof an upper computer to instruct workers to timely check and maintain the photovoltaic module in fault.

Description

technical field [0001] The invention relates to the field of photovoltaic array fault diagnosis, in particular to a parameter identification-based photovoltaic array fault diagnosis method. Background technique [0002] The increasingly prominent energy crisis and environmental pollution have made countries increase the implementation and promotion of renewable energy. Among them, photovoltaic power generation technology has been widely developed and applied due to its unique power generation characteristics. However, due to the large number of photovoltaic array components, the probability of various failures is high. If not handled in time, it may cause serious accidents and hazards, affect the efficiency of the entire power station, and cause huge economic losses. Therefore, effective measures must be taken to detect faults in time to ensure reliable and stable operation of the system. [0003] The impact of various faults on the output characteristics of photovoltaic mo...

Claims

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Application Information

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IPC IPC(8): H02S50/10
CPCY02E10/50
Inventor 汪洋闫天一潘天红高赵亮丁世宏李正明
Owner JIANGSU UNIV
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