Large-scale photovoltaic wind power information accessing system

Abstract

The invention discloses a large-scale photovoltaic wind power information accessing system, which comprises a main station, wherein the main station is connected with a plurality of substations, and the substations are connected with a plurality of photovoltaic wind power generation stations. The large-scale photovoltaic wind power information accessing system is characterized in that the main station is internally provided with a province-scheduled main station system, the province-scheduled main station system takes charge of AGC (Automatic Gain Control) policies, AVC (Automatic Voltage Control) policies and wind-photovoltaic power prediction of all photovoltaic wind power generation stations; the substations are internally provided with photovoltaic / wind power generation substation systems; and the photovoltaic wind power generation stations are provided with photovoltaic / wind power generation station monitoring system. According to the large-scale photovoltaic wind power information accessing system disclosed by the invention, wind power and photovoltaic multi-source and multi-time scale prediction can be realized, and active closed-loop control and reactive closed-loop control over wind power and photovoltaic can be realized; the large-scale photovoltaic wind power information accessing system disclosed by the invention has the advantages of standardizing the development of wind power photovoltaic generation and also promoting the receiving capability of a power grid to the wind power photovoltaic generation, has very important practical significance in promoting the coordinated development of the wind power photovoltaic generation and the power grid, and has typical demonstration significance on a nation wide scale.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a processing system for grid-connected photovoltaic power plants of electric power systems. Background technique [0002] Green energy power generation technology refers to the technology of using renewable energy such as solar energy and wind energy to generate electricity. Among them, solar photovoltaic power generation is a form of power generation that uses the photovoltaic effect principle of solar cells to directly convert solar radiation energy into electrical energy. Wind power generation is the use of wind turbines to convert wind energy into electricity. Under the pressure of global energy shortage and environmental degradation, green energy power generation technology has been valued by countries all over the world, and the photovoltaic power generation industry and wind power generation industry have both developed rapidly. However, as of the...

AI Technical Summary

Problems solved by technology

[0004] 1) Peak shaving problem. After large-scale photovoltaic power generation and wind power generation are connected to the grid, in good weather, if photovoltaic and wind power generation at noon at the same time, it will lead to a severe test for the peak shaving of the grid;

[0005] 2) The stability of the power grid. When a large disturbance occurs in the power grid, the photovoltaic power station and wind farm in the power grid are easy to quit operation because they do not have low-voltage ride-through capabilities, which will bring a secondary impact on the power grid and affect the transient stability of the power grid;

[0006] 3) The economical issue of operation. In order to ensure the safe and stable operation of the power grid, the power grid usually has some rotating reserve capacity. Due to the random fluctuation of photovoltaic power generation output, in order to ensure normal power supply to users, the power grid needs to be constantly adjusted according to the grid power of the photovoltaic power station. Rotating reserve capacity, the more photovoltaic power generation is connected to the grid, the more reserve capacity is prepared for it. If the power grid is dominated by thermal power, with the reduction of thermal power output, the operating economy of thermal power units is also decreasing. In addition, there are also Auxiliary costs for power grid operations such as frequency and tie line power flow control, voltage control and reactive power support, system active and reactive power backup, and other safety control measures need to be increased

[0007] Combining the characteristics of photovoltaic power generation and wind power generation, it can be found that one of the reasons for the above problems is the poor predictability and controllability of new energy sources such as photovoltaic power generation and wind power generation.

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