AC-DC interconnected mine power grid power supply system and power supply recovery control method

Abstract

An AC-DC interconnected mine power grid power supply system and a power supply recovery control method are suitable for the field of mine power grid structure design. When a power grid is arranged ina mine, a direct-current and alternating-current double-bus incoming line is adopted, and an alternating-current bus A is connected with a mine alternating-current load by entering a line from a firstmain transformer; a direct-current bus B enters from a second main transformer, is converted into a direct current through a bidirectional converter VSC1 and then is connected with a mine direct-current load through a DC / DC converter, and the direct-current bus A and the direct-current bus B are interconnected through a bidirectional converter VSC2 and a bidirectional converter VSC3; specifically, the alternating-current bus A is a main power supply circuit of a mine power grid and is connected with alternating-current loads such as a main elevator, an auxiliary elevator, a ventilator and anair compressor; and the direct-current bus is connected with the photovoltaic power generation equipment, the wind power generation equipment and the energy storage battery device through the bidirectional DC / DC converter. The power supply mode not only can reduce the energy loss and improve the electric energy quality, but also has the characteristics of strong adaptability, high redundancy and high reliability.

Description

technical field [0001] The invention relates to a mine grid power supply system and a power supply recovery control method, in particular to an AC-DC interconnected mine grid power supply system and a power supply recovery control method in the field of mine grid structure design. Background technique [0002] The working environment of the mine is complicated, and there are many high-power equipments. The safety and reliability of the power supply system directly affect the production operation of the coal mine and the personal safety of the staff. [0003] If the power supply of the mine is interrupted, the water pump will stop, which will easily cause floods, and the ventilator will also stop running, and the accumulation of gas will easily cause a gas explosion. In order to ensure the continuity of power supply in mines, Article 441 of the "Coal Mine Safety Regulations" stipulates that "the mine should have two power lines. When one circuit breaks down and stops power su...

AI Technical Summary

Problems solved by technology

[0004] However, with the gradual increase of coal output in coal mines, the continuous application of high-power transportation equipment and coal mining units has led to a significant increase in the load of the underground power supply system of coal mines.

In order to achieve the purpose of increasing production, reducing consumption and improving efficiency, frequency converters in coal mines are widely used, and the harmonic pollution caused by them cannot be ignored, and the addition of filters will increase the complexity of the system

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