A Method for Evaluation of Low Voltage Ride Through Capability of Photovoltaic Power Plant

Abstract

The invention relates to a photovoltaic power station low voltage ride through capability evaluation method. The method comprises steps: according to a photovoltaic power station topology structure and models of inverters accessed to the power station, the inverters are classified; according to a classification result, a main circuit model is built for the inverters; a photovoltaic power station digital-analog hybrid simulation model and a power grid model are built to form a simulated photovoltaic power station digital-analog hybrid simulation platform; and according to the simulation platform, the low voltage ride through capability of the photovoltaic power station is simulated, tested and evaluated. The technical scheme of the invention solves the difficult problem that the existing test condition can not meet the photovoltaic power station low voltage ride through test, and compared with the existing digital simulation evaluation, the power station low voltage ride through capability can be reflected more accurately.

Description

technical field [0001] The invention relates to the field of photovoltaic detection, and more specifically to a method for evaluating the low-voltage ride-through capability of a photovoltaic power station. Background technique [0002] In the actual testing of photovoltaic power plants, since the capacity of photovoltaic power plants far exceeds the capacity of the test device, it is generally difficult to directly test the grid-connected characteristics of the entire photovoltaic power plant. Especially for tests such as low voltage ride through, sampling tests are carried out on power station units at present, and the evaluation method of the whole station performance is replaced by the sampling test results. However, there are many factors affecting the overall grid-connected performance in the overall structure of photovoltaic power plants, such as unit collection lines, collector lines, main transformers, etc. The sampling test results meet the standard requirements, ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low voltage ride-through capability evaluation method for photovoltaic power plants. Based on the digital-analog hybrid simulation method, a detailed topology model of photovoltaic power plants is established, and based on the typical power electronic controller in the station and the detailed test model of the power plant, the fault ride-through evaluation of photovoltaic power plants is established. The platform realizes the evaluation of the fault ride-through capability of the photovoltaic power station, and solves the problem that the existing test conditions cannot meet the low-voltage ride-through test of the photovoltaic power station. Compared with the existing digital simulation evaluation, it can more accurately reflect the low-voltage ride-through capability of the photovoltaic power station

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