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

一种电网供电、供电恢复的技术，应用在交流网络电路、交流网络负载均衡、具有不同频率的单个交流网络等方向，能够解决煤矿井下供电系统负荷增加、增大系统复杂度等问题，达到传输容量提升、提升冗余度和安全性、保证可靠性的效果

Inactive Publication Date: 2020-09-01
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

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

Method used

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specific Embodiment

[0030] The control method of the AC-DC interconnected mine grid power supply system is as follows: when the system is in normal operation, for the ground substation part of the AC bus A, the main and auxiliary shaft hoists, air compressors and ventilators and other loads work normally; the underground central substation In the power substation, the 10kV voltage received is reduced to 660V and 380V through mine transformers, which are supplied to the low-voltage power equipment near the underground parking lot, including cart machines and small water pumps, and are supplied to high-voltage equipment, rectifier equipment and mining equipment. The mining area substation is located in the center of the mining area's electrical load, which converts high voltage into low voltage and distributes this voltage to all mining working faces and other electrical equipment in the mining area. For the DC bus B, connect the photovoltaic power generation system through a bidirectional DC / DC con...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02J3/00H02J3/38H02J3/32
CPCH02J3/02H02J3/0073H02J3/381H02J3/32H02J2203/10H02J2300/22H02J2300/28Y02E10/56Y02E10/76Y02E70/30
Inventor 梁睿许晴郭振华胡义华
Owner CHINA UNIV OF MINING & TECH
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