Grid-connected monitoring and evaluation method and system for photovoltaic power station

Abstract

The invention discloses a grid-connected monitoring and evaluation method and system of a photovoltaic power station. The method comprises the following steps: a photovoltaic power station model is formed in an RTDS real-time simulation platform; performance tests are performed on the photovoltaic power station model; Testing the low voltage ride-through capability of the photovoltaic power station, testing the voltage / frequency response characteristics of the photovoltaic power station, testing the active power output characteristic of the photovoltaic power station, testing the active power / reactive power control ability of the photovoltaic power station, testing the islanding prevention protection characteristic of the photovoltaic power station, and characterizing the test result of the power quality test of the photovoltaic power station to obtain corresponding test eigenvalues; Each test eigenvalue is inputted into a pre-trained machine learning prediction model to predict and obtain a grid-connected monitoring evaluation score result of the photovoltaic power station. The implementation of the invention can score the advantages and disadvantages of the designed photovoltaicpower station model, thereby realizing the overall evaluation of the photovoltaic power station model.

Description

technical field [0001] The invention relates to the field of wind power generators, in particular to a grid-connected monitoring and evaluation method and system for a photovoltaic power station. Background technique [0002] With the continuous deepening of the world's energy crisis and the continuous adjustment of my country's social and economic structure, the status of clean energy in the national energy structure has become increasingly prominent. In order to promote the rapid development of photovoltaic power generation, the state has successively issued relevant incentives and preferential policies for the development of photovoltaic industry. Inner Mongolia Autonomous Region is rich in solar energy resources, with annual sunshine hours of 2600-3400 hours, and annual total solar radiation in most parts of the region. J / m2 or more, the potential of photovoltaic power generation is huge. Most of the photovoltaic power stations under construction or planned in western M...

AI Technical Summary

Problems solved by technology

Photovoltaic power generation is connected to the grid through power electronic inverters, which are prone to harmonics and unbalanced three-phase currents; the randomness of output power can easily cause grid voltage fluctuations and flicker

Other distributed photovoltaic power sources are directly connected to the grid on the user side, and power quality problems directly affect the safety of users' electrical equipment

[0007] (2) Security problems caused by unplanned island effect

[0009] a) It may cause electric shock to the grid maintenance personnel when touching the island power supply line;

[0010] b) Make the power supply voltage and frequency in the isolated island area unstable, affecting the protection switch action procedure of the power distribution system;

[0011] c) If the load capacity is greater than the capacity of the photovoltaic power generation system, the photovoltaic power generation system will be overloaded and easily burned;

[0012] d) When the power grid is restored, the inrush current will damage the grid-connected inverter and other equipment due to phase asynchrony;

[0013] e) The single-phase power supply of the photovoltaic grid-connected system in the island state causes the problem of under-phase power supply of the local three-phase load

[0014] (3) The problem of low voltage ride through capability;

For the photovoltaic power station model in the design stage, there is no overall evaluation of the designed photovoltaic power station model, so it is impossible to conduct an overall evaluation of the photovoltaic power station model

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