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Photovoltaic array serial-parallel mismatch loss analysis method

A photovoltaic square array and analysis method technology, applied in photovoltaic power generation, photovoltaic module, photovoltaic system monitoring and other directions, can solve problems such as insufficient accuracy, mismatch result analysis error, lack of test equipment, etc., to improve the level of operation management, The effect of avoiding measurement errors

Active Publication Date: 2017-08-01
HUADIAN ELECTRIC POWER SCI INST CO LTD
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AI Technical Summary

Problems solved by technology

[0005] 1) Due to the limitations of on-site light intensity, light fluctuation, temperature, equipment accuracy, and correction formula accuracy, the power measurement error can reach 1% to 2%; while the current national standard stipulates that the series / parallel mismatch loss generally does not exceed 2 %, that is to say, the error is of the same order of magnitude or even greater than the measured value. Using this method to analyze the mismatch loss will lead to a huge error and even a wrong result
[0006] 2) Due to the fact that in the process of testing objects with different capacities, the corresponding accuracy of different ranges may be different, and there are also certain differences in the positive and negative characteristics of the error, which leads to inevitable errors in the analysis of mismatch results
[0007] 3) For the measurement of parallel mismatch loss, due to the large power of the square array, there is a lack of test equipment that can directly measure its power. The field often directly measures its operating voltage and operating current to obtain the corrected power
The method is not accurate enough

Method used

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Embodiment 1

[0039] see figure 1 .

[0040] This embodiment is a method for analyzing the mismatch loss of parallel photovoltaic arrays. Select the first string of component voltage sampling points of the square matrix as the reference point set [U 11 ,U 12 ,...,U 1x ,...,U 1n ]; the sampling current point of the ith component on the string is [Ui1 , U i,2 ,...,U iy ,...,U im ], if U iy 1x i(y+1) , the linear interpolation method is used, and the supplement corresponds to U 1x Position the component voltage value I ix ,in

[0041]

[0042] Using [(I 11 , U i1 ),..., (I 1x , U ix ),..., (I 1n , U in )] to replace the original I-V characteristic curve of the i-th block of the string;

[0043] Superimpose the I-V characteristic curves of all components on the string, for any reference point U i1 , the superimposed string voltage I Σx for:

[0044]

[0045] [(I Σ1 , U 11 ),..., (I Σx , U 1x ),..., (I Σn , U 1n )] constitute the I-V characteristics of the string,...

Embodiment 2

[0057] This embodiment is a photovoltaic series mismatch loss analysis method. The maximum power of the string is calculated by superimposing the I-V characteristic curve of the components, and the current sampling point of one component is selected as the reference point, and the other components are linearly interpolated in the corresponding Interpolate at the reference point, and then superimpose the I-V characteristic curves of all components point by point to obtain the I-V characteristic curve of the string.

[0058] The components are connected in series to form a string, and the current sampling point of the first component of the string is selected as the reference point set [I 11 , I 12 ,..., I 1x ,…, I 1n ]; the sampling current point of the ith component on the string is [I i1 , I i2 ,..., I iy ,..., I im ], if I iy 1x i(y+1) , the linear interpolation method is used, and the supplement corresponds to I 1x Position the component voltage value U ix ,in

[...

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Abstract

The invention relates to a photovoltaic array serial-parallel mismatch loss analysis method. The method is characterized by comprising the following steps: carrying out superimposed calculation on the maximum power of strings through an I-V characteristic curve for modules, and carrying out superimposed calculation on the maximum power of an array through an I-V characteristic curve for the strings. According to the method, the I-V characteristics of each string are superimposed, the power of a combiner box is given through theoretical calculation but not actual measurement, an analysis result can be linked with string measurement error, the problem that the parallel mismatch analysis result is too large in deviation caused by two-stage measurement error of the strings and the combiner box in an existing analysis method is avoided, and the accuracy of analysis is guaranteed.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and in particular relates to a method for analyzing mismatch loss between series and parallel connections of photovoltaic square arrays. Background technique [0002] In recent years, my country's photovoltaic power generation has developed rapidly. Carrying out photovoltaic on-site inspections can enable owners to understand the operating conditions of power plants and take effective optimization measures to avoid losses, which is of great significance to the quality control of photovoltaic power plants. [0003] Series / parallel mismatch loss is an important test item to understand the operating efficiency of power plants. It refers to the phenomenon of power loss of strings (square array) caused by inconsistent parameters when components (strings) are connected in series (parallel). The analysis of series / parallel mismatch is based on the power test. [0004] The current method of ...

Claims

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Application Information

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IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 李雪玉杨雨范炜刘庆超
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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