[논문]Medium Voltage Power Supply with Enhanced Ignition Characteristics for Plasma Torches

Jung, Kyung-Sub; Suh, Yong-Sug

doi:10.6113/jpe.2011.11.4.591

Medium Voltage Power Supply with Enhanced Ignition Characteristics for Plasma Torches 원문보기

Journal of power electronics, v.11 no.4, 2011년, pp.591 - 598

Jung, Kyung-Sub (Dept. of Electrical Eng., Chonbuk National University) , Suh, Yong-Sug (Dept. of Electrical Eng., Chonbuk National University)

Abstract ▼ AI-Helper

This paper investigates a power supply of medium voltage with enhanced ignition characteristics for plasma torches. A series resonant half-bridge topology is presented as a suitable ignition circuitry. The ignition circuitry is integrated into the main power conversion system of a multi-phase staggered three-level dc-dc converter with a diode front-end rectifier. A plasma torch rated at 3MW, 2kA and having a physical size of 1m is selected to be the high enthalpy source for a waste disposal system. The steady-state and transient operations of a plasma torch are simulated. The parameters of a Cassie-Mary arc model are calculated based on 3D magneto-hydrodynamic simulations. The circuit simulation waveform shows that the ripple of the arc current can be maintained within ${\pm}10%$ of its rated value under the presence of a load disturbance. This power conversion configuration provides a high enough ignition voltage, around 5KA, during the ignition phase and high arc stability under the existence of arc disturbance noise resulting in a high-performance plasma torch system.

주제어

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문제 정의

Considering the importance of an effective and simple start-up for plasma torches in industrial practice, the optimal design and operation of ignition circuitry for plasma torch systems have been paid little attention in the literature. This paper investigates a power conversion system of medium voltage for plasma torches under dynamic operating conditions during the arc ignition phase. The physical characteristics of plasma torches under dynamic operating conditions are modeled and simulated based on three-dimensional magneto-hydrodynamic computation.

제안 방법

This paper proposes a power supply of medium voltage with enhanced ignition characteristics for plasma torches. The series resonant half-bridge topology is presented as a suitable ignition circuitry.

이론/모형

The results of this threedimensional simulation are used to formulate the Cassie-Mayr equation for the plasma arc. A relevant circuit model of the plasma arc system is derived from the Cassie-Mayr equation. A series resonant half-bridge topology is presented as a suitable ignition circuitry in this paper.
It can also provide high arc stability due to a relatively high effective carrier frequency. The arc model, based on the Cassie-Mayr equation, including proper physical constants for the ignition phase, is integrated into the circuit simulation of the proposed converter topology. The complete system simulation including a circuit model of a plasma torch confirms the operational characteristics of the proposed converter system.
The physical characteristics of plasma torches under dynamic operating conditions are modeled and simulated based on three-dimensional magneto-hydrodynamic computation. The results of this threedimensional simulation are used to formulate the Cassie-Mayr equation for the plasma arc. A relevant circuit model of the plasma arc system is derived from the Cassie-Mayr equation.

참고문헌 (21)

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