Photovoltaic-power-station low-voltage penetrating performance evaluation method based on inverter model test

Abstract

The invention provides a photovoltaic-power-station low-voltage penetrating performance evaluation method based on an inverter model test. The method includes the following steps: step1: carrying out a low-voltage penetrating model test on a photovoltaic inverter single-machine model; performing fault simulation on a grid-connection photovoltaic inverter model according to test parameters of the model test and verifying the low-voltage penetrating performance of the photovoltaic inverter single-machine model; step2: constructing a photovoltaic power station model; step3: performing steady-state power flow calculation on the photovoltaic power station model and analyzing the steady-state performance of the photovoltaic power station model; step4: according to a low-voltage penetrating performance standard of the photovoltaic power station, verifying the low-voltage penetrating performance of the photovoltaic power station model. Compared with the prior art, the photovoltaic-power-station low-voltage penetrating performance evaluation method based on the inverter model test is capable of meeting evaluation demands of power grids on low-voltage penetrating technical requirements of a large-size photovoltaic power station under conditions that a low-voltage penetrating test on the whole of a photovoltaic power station cannot be carried out and a test on a photovoltaic power generation unit cannot be carried out effectively.

Description

technical field [0001] The invention relates to a method for evaluating the performance of a photovoltaic power station, in particular to a method for evaluating the performance of a low-voltage ride-through of a photovoltaic power station. Background technique [0002] Photovoltaic power generation has become an important form of solar resource development and utilization, among which the access of large-scale photovoltaic power plants will have a profound impact on the safe and stable operation of the power grid, especially when the power grid fails, the sudden disconnection of photovoltaic power plants will further deteriorate the operation of the power grid. lead to more serious consequences. When the penetration rate of the photovoltaic power station is high or the power output is high, the fault of the power grid will cause the trip of the photovoltaic power station. Since the photovoltaic power station will take time to reconnect to the grid after the fault is restore...

AI Technical Summary

Problems solved by technology

However, the maximum capacity of the low-voltage ride-through detection device in the existing technology is about 8MW, and it is impossible to carry out the low-voltage ride-through test at the grid-connected point of the photovoltaic power station; The capacity generally exceeds 10MW, and even reaches more than 100MW; conventional low-voltage ride-through detection devices can only complete the test for photovoltaic power generation units, and cannot directly test the low-voltage ride-through performance of photovoltaic power plants at the grid-connected point. In addition, due to the number of low-voltage ride-through detection devices on site, Geographical environment constraints, test data is not easy to obtain Low voltage ride-through performance test of photovoltaic power generation unit cannot be effectively carried out, unable to meet the needs of large-scale photovoltaic power plants

In summary, it is difficult to carry out the low voltage ride through performance evaluation of photovoltaic power plants directly through field tests, and it is impossible to evaluate the low voltage ride through performance of photovoltaic power plant modeling through photovoltaic power generation units

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