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Energy storage-containing arc furnace energy-supply power system and control method thereof

A power control and power system technology, applied in the direction of eliminating/reducing asymmetry in polyphase networks, reducing asymmetry in polyphase networks, and load balancing in AC networks, etc. Point power factor is low and other problems, to reduce the impact and solve the effect of low power factor

Pending Publication Date: 2017-06-13
SHENYANG POLYTECHNIC UNIV
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AI Technical Summary

Problems solved by technology

[0003] (1) Large impact changes in electric arc furnace power lead to local fluctuations and flicker in the power grid;
[0004] (2) Load asymmetry causes three-phase unbalance;
[0005] (3) The strong inductive characteristics of the electric arc furnace lead to low power factor of the grid access point

Method used

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  • Energy storage-containing arc furnace energy-supply power system and control method thereof
  • Energy storage-containing arc furnace energy-supply power system and control method thereof
  • Energy storage-containing arc furnace energy-supply power system and control method thereof

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention will be further described:

[0038] (1) The structure of the system:

[0039] The electric arc furnace power supply with energy storage is mainly composed of grid access and measurement unit, grid-side converter unit, DC bus, bidirectional DC / DC conversion unit, high-power energy storage device, inverter unit and main controller. as attached figure 1 As shown, the electric arc furnace is isolated from the grid through the grid-side converter unit, DC bus and inverter unit, and the high-power energy storage device is connected to the DC bus through the DC / DC unit.

[0040] The power grid is rectified to obtain a DC voltage, and the energy storage device system is connected to the DC bus bar through a bidirectional DC / DC conversion unit for regulation, and the DC bus bar supplies power to the AC arc furnace load through the inverter unit. When the power grid voltage fluctuates, the stored energy of th...

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Abstract

The invention relates to an energy storage-containing arc furnace energy-supply power system and a control method thereof. The system comprises a power grid access and measuring unit, a network-side variable flow unit, a direct current bus, an energy storage power control unit, a high power energy storage device, an inverter unit and a main controller. According to the method, the power supply of an arc furnace is kept stable when a power grid is abnormal, the impact on the power grid is reduced, and the problems that the power factor of power grid access points is low and three phases are imbalanced caused by the arc furnace are solved. When the power grid voltage flickers and power fails in a short time, the power can be uninterruptedly and stably supplied to the arc furnace, so that the furnace temperature is stabilized and the quality of metallurgical products is ensured; meanwhile, the adverse effects on the power grid caused by factors of power fluctuation and low power factor of the arc furnace can be reduced.

Description

Technical field: [0001] The invention relates to an electric arc furnace energy supply power supply with energy storage and a control method thereof. Background technique [0002] my country's AC electric arc furnaces developed rapidly in the 1990s of the last century. The quality of smelted products depends on the control of furnace temperature, so the stability of power supply is very important to electric arc furnaces. At the same time, it is a kind of high-power electrical equipment. The AC electric arc furnace still has a great influence on the power factor and voltage stability of the power grid when it is working normally, and many problems need to be solved. It mainly includes the following aspects: [0003] (1) Large impact changes in electric arc furnace power lead to local fluctuations and flicker in the power grid; [0004] (2) Load asymmetry causes three-phase unbalance; [0005] (3) The strong inductive characteristics of the electric arc furnace lead to low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/26
CPCH02J3/26H02J3/32Y02E40/50
Inventor 王晓东刘颖明李凯凯
Owner SHENYANG POLYTECHNIC UNIV
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