Method for detecting reliability of photovoltaic power generation system

Abstract

The invention provides a method for detecting the reliability of a photovoltaic power generation system, and belongs to the technical field of photovoltaic power station detection. The method comprises the following steps: acquiring a reliability detection parameter of each photovoltaic power generation unit in a photovoltaic power generation system to be detected in a predetermined statistical period, wherein the reliability detection parameter include any one of actual utilization rate, average fault-free operation time or average fault repair time; and detecting the reliability of the photovoltaic power generation system to be detected according to the discrete rate of the reliability detection parameter in the predetermined statistical period. By adopting the method of the invention, the reliability of photovoltaic power generation systems and power generation equipment thereof can be detected accurately and quickly, operation and maintenance of photovoltaic power generation systems can be guided in a graded, hierarchical and normalized way, stable, efficient and safe operation of photovoltaic power generation systems is ensured, and a solid foundation is laid for large ground photovoltaic power generation systems and distributed photovoltaic operators to improve economic benefits and establish a grid-friendly photovoltaic power generation system.

Description

technical field [0001] The invention relates to a method for detecting the reliability of a photovoltaic power generation system, and belongs to the technical field of photovoltaic power station detection. Background technique [0002] Existing photovoltaic power generation systems are usually composed of photovoltaic power generation units, DC collection circuits, combiner boxes, DC power distribution cabinets, inverters, and photovoltaic online monitoring systems. figure 1 What is shown is the typical electrical structure of the photovoltaic power generation system. The electric energy output by the photovoltaic power generation unit is first converged to the combiner box, then converged to the DC power distribution cabinet, and finally output after AC / DC conversion. [0003] The components that cause the shutdown of the photovoltaic power generation unit are mainly the electrical faults of the inverter, the combiner box and the DC collection circuit. figure 2 What is sh...

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Problems solved by technology

[0004] Since the existing photovoltaic power generation system relies on the photovoltaic online monitoring system to obtain operating data, it can only compare the operating status of different photovoltaic power generation units horizontally. By identifying the output status of different photovoltaic power generation units under the same external meteorological environment, the inconsistency is found. In order to judge the photovoltaic power generation unit that is faulty or has hidden dangers

This method is based on the fact that most of the photovoltaic power generation units in the photovoltaic power generation system are in the normal power generation state. When the photovoltaic power generation units in the photovoltaic power generation system have family defects, the faulty equipment cannot be well identified.

At the same time, although the existing relevant standards provide relevant experimental methods and means for the reliability testing of photovoltaic power generation systems, due to the inherent characteristics of scattered equipment, large quantities, and many types of photovoltaic power generation systems, the existing daily maintenance and troubleshooting methods easily lead to waste of maintenance time and effort

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