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Estimation method of sub-array parallel mismatch in photovoltaic power station

A photovoltaic power station and sub-array technology, applied in the field of estimation, can solve problems such as inaccurate estimation and large differences in test conditions, and achieve accurate results

Active Publication Date: 2019-09-13
CHINA HUADIAN ENG +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the lack of an effective test method for evaluating parallel mismatch in photovoltaic power plants in the prior art and the large difference in parallel mismatch test conditions between different groups of strings leads to inaccurate estimation defects. Provide a more accurate estimation method for sub-array parallel mismatch of photovoltaic power plants

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  • Estimation method of sub-array parallel mismatch in photovoltaic power station

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[0026] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples. For the experimental methods that do not specify specific conditions in the following examples, select according to conventional methods and conditions, or according to the product instructions.

[0027] refer to figure 1 The method for estimating the parallel mismatch of the sub-arrays of the photovoltaic power plant in this embodiment includes evaluating the parallel mismatch of the sub-arrays of the string inverter and the parallel mismatch of the sub-arrays of the centralized inverter. The estimation method includes the following steps :

[0028] S1: Perform IV scan on the sub-array to obtain the IV curves of n strings in the sub-array, and measure the irradiance and component temperature of the sub-array during IV scanning;

[0029] S2: Calculate the maximum output power of each string according to the IV curve of each st...

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Abstract

The invention discloses an estimation method for parallel mismatch of subarrays of a photovoltaic power station. The estimation method comprises the following steps of: carrying out IV scanning on thesubarrays to obtain IV curves; obtaining theoretical maximum output power P1 of the subarrays according to the IV curve of each string, calculating theoretical maximum output power P2 of string typeinverter subarrays; calculating theoretical maximum output power P3 of centralized type inverter subarrays; obtaining parallel mismatch loss of the string type inverter subarrays deltas and the centralized type inverter subarrays deltac. The estimation method disclosed by the invention has the advantages that IV curves of all strings of the subarrays can be measured and calculated simultaneously,the voltage differences of maximum power points of each string are obtained by testing under same conditions at the moment, so that the mismatch of working voltages among all the strings in the subarrays can be accurately evaluated.

Description

technical field [0001] The invention relates to an estimation method, in particular to an estimation method for sub-array parallel mismatch of a photovoltaic power station. Background technique [0002] The parallel mismatch of strings and parallels in a photovoltaic power station is a factor that leads to the loss of power generation of the power station, which affects the power value of the power station. However, there is currently no good solution for estimating the mismatch between the series and parallel connections of the power station. The variability makes the estimates less accurate. The quantitative estimation of parallel mismatch is the main factor that can help the power station to evaluate the low power generation of the power station. Therefore, a more accurate parallel mismatch estimation method is needed. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the lack of an effective test method for e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/10
CPCH02S50/10Y02E10/50
Inventor 张廷军张浩禹超
Owner CHINA HUADIAN ENG
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