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Failure detection method for photovoltaic power generation units with multiple same mounting dip angles

A photovoltaic power generation and power generation unit technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules, etc., can solve problems such as time-consuming and laborious, long fault diagnosis time, missed detection and misjudgment

Active Publication Date: 2015-04-01
JIANGSU BLUE SKY PHOTOVOLTAIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fault diagnosis takes a long time, time-consuming and labor-intensive, because manual detection may cause missed detection and misjudgment

Method used

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  • Failure detection method for photovoltaic power generation units with multiple same mounting dip angles
  • Failure detection method for photovoltaic power generation units with multiple same mounting dip angles
  • Failure detection method for photovoltaic power generation units with multiple same mounting dip angles

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Experimental program
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Embodiment 1

[0034]This embodiment 1 is a fault diagnosis of a solar module string of a 500kWp photovoltaic power generation unit in a photovoltaic power station. 16 pieces of 230Wp modules form a string, and a total of 135 module strings are connected to a 500kW centralized grid-connected inverter through a combiner box. The combiner box is equipped with a current sensor to detect the working current of the solar module string. The photovoltaic power station monitoring system integrates the signal acquisition unit and the fault diagnosis unit functional modules, and the signal acquisition unit is responsible for collecting the current sensor signal of the solar module string under test. The fault diagnosis unit completes the fault diagnosis function. Specifically, the module string current is used as the performance parameter, and the maximum power point current under the standard working condition of the module is used as the benchmark for normalization processing. The cycle is 5 minutes...

Embodiment 2

[0050] This embodiment is an 11MW photovoltaic power station, which is divided into 20 photovoltaic power generation units. Among them, 10 photovoltaic power generation units form a string according to 16 230Wp modules, a total of 135 module strings, forming a 496.8kWp photovoltaic module square array, which are connected to a 500kW centralized grid-connected inverter configuration through a combiner box. The other 10 photovoltaic power generation units form a string according to 16 230Wp modules, a total of 172 module strings, forming a 632.96kWp photovoltaic module square array, which are connected to a 630kW centralized grid-connected inverter configuration through a combiner box. The grid-connected inverter is equipped with voltage and current sensors to measure and calculate the output DC power of solar modules, that is, the power of the square array of photovoltaic modules. The photovoltaic power plant monitoring system integrates functional modules such as a signal acqu...

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Abstract

The invention discloses a failure detection method for photovoltaic power generation units with multiple same mounting dip angles. The method comprises the following steps: S1, electric parameters of the photovoltaic power generation units are selected as performance parameters; S2, average performance parameters of the photovoltaic power generation units in the sampling period are calculated; S3, normalization processing of data is carried out; S4, performance vectors of the power generation units are calculated; S5, correlation coefficients of the performance vectors and average performance vectors are calculated; S6, in the new sampling period, correlation coefficients of the performance vectors and the average performance vectors of all power generation units of the new sampling period are calculated; S7, a time sequence vector formed by the correlation coefficients is calculated; S8, a threshold value of the time sequence vector is set, and failures or abnormalities of the power generation units are judged. Automatic failure diagnosis is achieved, the failures can be accurately and rapidly found, the failure eliminating time is shortened, the power generation amount is improved, and meanwhile the labor intensity is reduced.

Description

technical field [0001] The invention relates to the field of fault detection of photovoltaic power generation units, in particular to a fault detection method for multiple photovoltaic power generation units with the same installation inclination. Background technique [0002] In order to efficiently use the energy of the sun, a solar power generation system in which a large number of solar panels are arranged has been widely used. Current solar power generation systems range from small-scale systems installed on rooftops to large-scale systems capable of supplying regional power with a generating capacity of several megawatts or more. [0003] In any solar power generation system, due to errors in the work of establishing the system, defects in its parts, degradation over time based on years of use, failures caused by lightning and the like, weather, maintenance or shading and other external factors, its power generation volume may decrease. When the drop in power generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/10
CPCH02S50/00Y02E10/50
Inventor 史君海瞿建国冷吉果缪卫龙唐沁雪张勇成
Owner JIANGSU BLUE SKY PHOTOVOLTAIC TECH