Series-parallel mismatch loss on-line test method

Abstract

The present invention provides a series-parallel mismatch loss on-line test method. The method includes the following steps that: step 1, an on-line test device for series-parallel photovoltaic assembly mismatch testing is established; step 2, the effective data of the photovoltaic mismatch testing are acquired; step 3, the effective data of the photovoltaic mismatch testing are verified, if the effective data of the photovoltaic mismatch testing pass the verification, the series-parallel mismatch loss rate of a photovoltaic assembly is calculated; step 4, if the effective data of the photovoltaic mismatch testing does not pass the verification, the method returns to step 2, the effective data of the photovoltaic mismatch testing are acquired again; and step 5, the calculation result of the series-parallel mismatch loss rate of the photovoltaic assembly is obtained, after a test period is terminated, the on-line test device is dismantled, and the normal power generation of a photovoltaic array is restored. With the series-parallel mismatch loss on-line test method of the invention adopted, complete synchronization of the electrical performance parameters of a tested photovoltaic assembly and photovoltaic meteorological data is completed, transformation error of the transformation of measured data to an STC condition for series-parallel loss calculation in traditional series-parallel mismatch loss offline testing can be avoided, and the efficient and reliable operation of a photovoltaic power plant can be ensured.

Description

technical field [0001] The invention relates to the field of new energy and power systems, in particular to an online testing method for series-parallel mismatch loss. Background technique [0002] In recent years, the installed capacity of photovoltaic power generation in my country has developed rapidly. The construction quality and power generation efficiency of photovoltaic power plants have been paid more and more attention by power plant investors, purchasers and operators. Among them, the mismatch loss of series and parallel modules is one of the factors that lead to the decline in power generation efficiency of photovoltaic power plants. one. The series-parallel mismatch loss of photovoltaic modules is due to rushing to purchase modules during power station construction and rushing to install construction schedules. During the installation process, the consistency of module parameters was not screened. Some parameters are very different, and even different types of mo...

AI Technical Summary

Problems solved by technology

When this method is tested, the combiner boxes, strings and components need to be cut out of the system separately, which not only affects the normal power generation of the power station, but also requires a large amount of wiring and disconnection during the test process, and the test efficiency is low. When the test data is converted to STC conditions, there are more or less inevitable conversion errors in the process, which increases the uncertainty of the test results

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