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Photovoltaic rapid detection and accurate diagnosis method based on maximum power point tracking data

A technology of maximum power point and tracking data, applied in photovoltaic power generation, instruments, control/regulation systems, etc., can solve the problems of high diagnosis cost, untimely fault detection and positioning, short detection time, and reduce the possibility of causing fire , the effect of overcoming power loss

Active Publication Date: 2022-03-11
SOUTHEAST UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of untimely fault detection and positioning in the existing photovoltaic system and the high cost of diagnosis, and to provide a fast abnormal detection and accurate diagnosis method based on maximum power point tracking data

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  • Photovoltaic rapid detection and accurate diagnosis method based on maximum power point tracking data

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Embodiment Construction

[0045] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments. Such as figure 1 As shown, the method for rapid detection and accurate diagnosis of photovoltaics based on maximum power point tracking data in this embodiment can be easily embedded in existing commercial inverters, and the method includes the following steps in sequence:

[0046]S1: Establish a relationship model of the influence of common severe faults and partial shading on the output in photovoltaic systems, and consider the relationship characteristics of different mismatch levels in the two systems with or without blocking diodes;

[0047] S2: Realize abnormal situation detection based on the current drop between adjacent sampling intervals in the maximum power point tracking process, and determine an appropriate threshold considering the sampling frequency and disturbance step size;

[0048] S3:...

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Abstract

The invention discloses a photovoltaic rapid detection and accurate diagnosis method based on maximum power point tracking data, comprising the following steps: detecting abnormality based on the maximum power point instantaneous current drop, wherein the threshold value setting considers the sampling interval and the disturbance step size at the same time; The number of key operating points and extreme points on the characteristic curve distinguishes shading and line faults, and further evaluates the fault degree; according to the fault evaluation results, the operating voltage is set to distinguish faulty strings from normal strings, so as to realize fault location. The detection method proposed in the present invention does not need to install additional data acquisition equipment, can be easily embedded in commercial inverters, and is applicable in complex environments such as low irradiance, low mismatch level and installation of blocking diodes, and the extracted inflection point features can be Effectively distinguish partial occlusions and line faults with similar characteristics to avoid unnecessary power-off protection. In addition, the proposed fault location method can quickly isolate faults and ensure the safe operation of the system.

Description

technical field [0001] The invention relates to a photovoltaic rapid detection and accurate diagnosis method based on maximum power point tracking data, which belongs to the technical field of new energy sources. Background technique [0002] Due to its own unique advantages, photovoltaic power generation has become one of the fastest-growing energy sources. In recent years, it has been widely used in countries all over the world. A basic photovoltaic system is mainly composed of photovoltaic arrays, power conditioners, inverters, and cables connecting each unit. The series-parallel structure between components will seriously affect the operating efficiency of the system if any component is abnormal or faulty. Output and system safety and reliability, according to statistics, the annual loss of photovoltaic systems due to various failures can reach 18.9%. Therefore, condition monitoring and fault diagnosis are essential for the safe, reliable and efficient operation of phot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 张侃健李晨曦陈昕怡方仕雄谢利萍张金霞葛健魏海坤
Owner SOUTHEAST UNIV
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