Cascaded multi-level tundish electromagnetic heating power supply comprehensive control method

A technology of cascading multi-level heating power supplies, which is applied in the direction of electrical components, output power conversion devices, irreversible AC power input conversion to DC power output, etc., to achieve the effect of energy conversion

Active Publication Date: 2016-08-10
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 pow

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  • Cascaded multi-level tundish electromagnetic heating power supply comprehensive control method

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[0038] figure 1 Shown is the cascaded multi-level structure diagram for the tundish electromagnetic heating power supply of the present invention, each phase of the cascaded multi-level structure is composed of upper and lower bridge arms, which can be regarded as two star-shaped cascaded The SVG input terminals are connected in parallel, the output terminals are connected in series, the DC output terminal is connected to the load of the electromagnetic heating power supply, and the three-phase AC grid system level is 10kV / 50Hz. In the figure, u sx (x=a, b, c, the same below) and i sx are the voltage and current of the three-phase AC grid, respectively, u upx , u dnx , i upx and i dnx are the output voltage and current of the upper and lower bridge arms of each phase respectively, SM is the cascaded H-type full-bridge sub-module of 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-...

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Abstract

The invention discloses a cascaded multi-level tundish electromagnetic heating power supply comprehensive control method. A cascaded multi-level tundish electromagnetic heating power supply is a cascaded full bridge multi-level modularized structure for which the comprehensive control method comprises the following steps: voltage, an input current and a ring current of a three phase power grid are respectively converted to be in a two-phase stationary coordinate system and a three-phase stationary coordinate system; the input current and the ring current are controlled in a dead beat manner, and a balance control strategy is adopted for capacitor voltage in a bridge arm; a quadratic sum and a quadratic difference of upper and lower bridge arm module capacitor voltage in a horizontal direction and a voltage error square of the upper and lower bridge arm module capacitor voltage in a vertical direction are used as voltage control quantity; unbalanced power in a three phase alpha beta 0 stationary coordinate system can be obtained via the voltage control quantity; thus module voltage balance is achieved via control over bridge arm energy. Via use of the cascaded multi-level tundish electromagnetic heating power supply comprehensive control method, rapid tracking control of input and output currents can be realized, control efficiency is improved, and requirements for induction heating power supply energy balance and heavy current rapid transformation are satisfied.

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 steel heat treatment. The tundish induction heating power supply is used as the medium for its electric energy conversion, and its input current affects the public grid. power quality, 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, and the tundish induction heating system has a great influence on the stability and stability of the power supply energy transmission. High current and fast switching ...

Claims

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Application Information

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IPC IPC(8): H02M7/04H02M1/00
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
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