A comprehensive control method for cascaded multi-level tundish electromagnetic heating power supply
A technology of cascading multi-level and heating power supplies, which is applied in the direction of induction heating control, induction heating, electrical components, etc.
Active Publication Date: 2018-05-11
HUNAN UNIV
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a cascaded multi-level tundish for realizing the two-way flow of energy between the tundish induction electromagnetic heating power supply and the power grid, solving the problems of the cost and volume of the power supply and the deficiencies of the prior art Including the comprehensive control method of the electromagnetic heating power supply, the cascaded multi-level electromagnetic heating power supply adopts the F-MMC structure, and based on this structure, the problem of fast tracking of the input and output current of the device is solved, and the cascaded multi-level power supply is guaranteed under the premise of a stable control system. The balance of the capacitor voltage of each cascaded module in the electromagnetic heating power supply structure of the level middle package realizes the efficient utilization of the electromagnetic heating power supply energy
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[0038] figure 1 Shown is a cascaded multilevel structure diagram for the electromagnetic heating power supply for the tundish of the present invention. Each phase of the cascaded multilevel structure is composed of upper and lower bridge arms, which can be regarded as two star cascades. The input terminals of the SVG are connected in parallel, the output terminals are connected in series, and the DC output terminal is connected to the electromagnetic heating power load. The three-phase AC power grid system level is 10kV / 50Hz. In the figure, u sx (x=a,b,c, the same below) and i sx are the three-phase AC grid voltage and current, respectively, u upx , u dnx , i upx and i dnx are the output voltage and bridge arm current of the upper and lower bridge arms of each phase, respectively, SM is the H-type full-bridge sub-module cascaded on the upper and lower bridge arms of each phase, u cix (x=a,b,c,i=1,..n, the same below) is the DC side capacitor voltage of the cascaded sub-m...
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The invention discloses a cascaded multi-level tundish electromagnetic heating power supply and a comprehensive control method thereof. The cascaded multi-level tundish electromagnetic heating power supply is a cascaded full-bridge multi-level modular structure, and its comprehensive control The implementation of the method includes the following steps: transform the three-phase grid voltage, input current and circulating current into the two-phase static coordinate system and the three-phase static coordinate system respectively, and adopt deadbeat control of the input current and circulating current; the capacitor voltage inside the bridge arm adopts Balance control strategy, select the sum of the squares of the capacitor voltage of the upper and lower bridge arm modules in the horizontal direction, the square difference and the square of the voltage deviation in the vertical direction as the voltage control quantity to obtain the unbalanced power in the three-phase αβ0 static coordinate system, and then through the control bridge arm energy to balance the module voltage. The invention realizes the fast tracking control of the input and output currents, improves the control efficiency, and satisfies the requirements of the energy balance of the induction heating power supply and the fast conversion of the large current.
Description
technical field [0001] The invention relates to a comprehensive control method for a cascaded multi-level tundish electromagnetic heating power supply. 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 heat treatment of steel. The tundish induction heating power supply is used as the medium for its power conversion, and its input current affects the public power grid. and its output current is directly related to the temperature control effect of the tundish, so the research on the control method of the tundish induction heating power supply has good theoretical and engineering significance. The requirements for rapid transformation of large currents are relatively high. [0003] The existing high-frequency resonance induction heating power supply is mostly used in low-p...
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IPC IPC(8): H02M7/12H05B6/06
CPCH02M1/00H02M7/04H02M1/0003
Inventor 罗安岳雨霏徐千鸣马伏军何志兴周奔丁红旗郭鹏
Owner HUNAN UNIV