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A method for calculating the group string parallel mismatch loss of a photovoltaic power station

A mismatch loss and photovoltaic power station technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., to achieve low parallel mismatch and reduce barrel effect

Inactive Publication Date: 2018-12-18
苏州协鑫新能源运营科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the lack of calculation of the string-parallel mismatch loss in the prior art, and a new calculation method for the string-parallel mismatch loss of a photovoltaic power station is proposed, which has the ability to accurately calculate Characteristics of string-parallel mismatch loss in photovoltaic power plants

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] A calculation method for string-parallel mismatch loss of a photovoltaic power station, comprising the following steps:

[0019] Step ①: select an inverter as the collection object, and monitor and collect the operation data of the inverter;

[0020] Step ②: Select sampling points on different strings connected to the inverter, measure the current value and voltage value of different strings at different times through each sampling point, select x+1 strings, and select each A set of current values ​​and voltage values ​​are measured at two times for each group string, so that a total of two sets of measured values ​​are marked as [I11, I12, I21, I22, ..., Ixx, Ix, x+1], [U11 ,U12,U22,...,Uxx,Ux,x+1];

[0021] Step ③: collect the current output value and the voltage output value of the DC side of the inverter as comparison values, the current output value is marked as Ic, and the voltage output value is marked as Uc;

[0022] Step ④: Accumulate the power of each string...

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PUM

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Abstract

The invention discloses a method for calculating the group string -parallel mismatch loss of photovoltaic power stations, the main technical problem to be solved is the lack of calculation of group string parallel mismatch loss in the prior art, The invention adopts a method for calculating the group string parallel mismatch loss of a group of photovoltaic power stations to detect the health valueof the group string and the health value of the component. Step 2: Select sampling points on different groups of strings connected with the inverter, and measure the current value and voltage value at different times of different groups of strings through each sampling point, thus solving the problem, and can be used for calculating the group string parallel mismatch loss of the photovoltaic power station.

Description

technical field [0001] The invention relates to a method for calculating the string-parallel mismatch loss of a photovoltaic power station. Background technique [0002] In recent years, the installed capacity of photovoltaic power generation in my country has developed rapidly, and the problem of unrestricted power loss in power stations has become increasingly prominent. The root of the problem is also multi-faceted, such as from design, construction, loss of key equipment (battery components, combiner boxes, inverters, etc.), monitoring and maintenance, system operation and maintenance, etc. Such problems are expensive to deal with and difficult to solve. However, the failure and loss of key equipment have a significant impact on the power generation of the power station, and human intervention is strong. Timely detection and treatment can reduce the loss of power generation. [0003] From the perspective of photovoltaic power station system networking, the power genera...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/383Y02E10/56
Inventor 刘海若徐凯吴玉川陈晓东
Owner 苏州协鑫新能源运营科技有限公司
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