Multi-layer control method for electromagnetic induction heating system of tundish
A technology of electromagnetic induction heating and multi-layer control, which is applied in the direction of induction heating control, induction heating, ohmic resistance heating, etc., can solve the problems of complex winding structure and bulky volume, and achieve the effect of reducing the amount of calculation and fast dynamic response characteristics
Active Publication Date: 2021-07-23
HUNAN UNIV
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Problems solved by technology
Multi-winding transformers and diode rectifiers obtain uncontrollable direct current, which is used as the input voltage of the subsequent H-bridge module, and multiple H-bridge outputs in the latter stage are cascaded to achieve high-voltage AC output; it has the advantages of simple control and reliable structure, but the winding structure complex, bulky
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[0037] figure 1 Shown is the topological structure diagram of the tundish electromagnetic heating system used in the modular multi-level AC-AC conversion of the present invention, the input end is a three-phase AC power supply, u ga , u gb , u gc Respectively A, B, C three-phase AC phase voltage, i sa , i sb , i sc They are the three-phase input current respectively, and the output terminal is medium frequency AC, which is connected with the electromagnetic heating device of the tundish, u o is the output voltage. The modular multilevel AC-AC converter is composed of three-phase bridge arms, each phase bridge arm is cascaded with N H-bridge sub-modules, and each bridge arm is connected through two bridge arm inductors L. i ux , i lx (x=a,b,c) respectively represent the current flowing through the upper and lower bridge arms of each phase, u ux , u lx (x=a, b, c) represent the equivalent voltage values of the upper and lower bridge arms of each phase respectively. ...
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The invention discloses a multi-layer control method for an electromagnetic induction heating system of a tundish. The temperature control of the top layer is used for precise adjustment of the temperature of the tundish body, the voltage balance control maintains the capacitance voltage stability of the induction heating power supply, and the middle layer current prediction control realizes induction heating. Collaborative optimization tracking of AC input current, circulating current and output current of the heating power supply; the bottom layer includes switching action distribution and voltage equalization control, which distributes the switching action to the power sub-module of the induction heating power supply and maintains the balance of the capacitor voltage of the sub-module. The top-layer temperature control and voltage balance control obtain the output current command, input current command and circulating current command. The invention realizes the multi-objective control of the temperature, input current, output current and module voltage of the electromagnetic induction heating system of the tundish.
Description
technical field [0001] The invention relates to a multi-layer control method of a tundish electromagnetic induction heating system based on modularized multi-level AC-AC transformation, which is suitable for the occasion of medium-frequency, high-voltage, high-power tundish electromagnetic heating. Background technique [0002] With the advancement of power electronics and semiconductor technology, the emergence of high-power and high-efficiency variable frequency power supplies has greatly promoted the development of induction heating technology for steel heat treatment. The electric current induces an electromotive force in molten steel, and then generates an induced current. The induced current flows in the molten steel to generate Joule heat to complete the heating of the molten steel and complete the conversion of electrical energy to thermal energy. The electromagnetic induction heating system of the tundish reduces the superheat of molten steel and maintains constant...
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IPC IPC(8): H05B6/08H02M5/293
CPCH02M5/293H05B6/08H05B2206/02H02M5/2932
Inventor 罗安何志兴易伟浪陈燕东徐千鸣岳雨霏郭鹏黄旭程洪乐荣王锋
Owner HUNAN UNIV