• 전기의세계
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• v.23 no.4
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• pp.32-35
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• 1974

Thyristor inverter의 유형은 Switching기능에 따라 분류하고 있는데, 크게 나누어 Bridge형 converter와 Cycloconverter로 나누는데, 여기서는 이중 3상 Bridge형 Thyristor Inverter에 대한 전력변환과정을 Vector해석법에 의하여 그 개요를 설명하고, 여기에 현재 가장 효율적 switching방식이라 보고 있는 펼스폭변조환류게이트방식(Pulsewidth modulation commutation gating system)을 적용하였을 때의 효과를 첨가 설명코자 한다.

• 전기의세계
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• v.17 no.2
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• pp.6-10
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• 1968

The conversive limitation of electric energy for the thyristor inverter is analysed under the boundary conditions which the term of a negative inverse voltage is longer than that of the turn off time of the thyristor under commutation. It is clear that the maximum electric energy conversion is affected by the turn off time of the thyristor, the reactance of a commutation reactor, the capacity of a commutation condenser and the voltage of Direct current source. It is useful for design the thyrister invertor and the motor speed control to apply the above conclusion.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.269-274
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• 1998

This paper describes a scaled model for PWM thyristor current-source inverter with a commutation circuit. The system consists of a 6-pulse thyristor bridge and an LC resonant circuit with thyristor switches, which offers thyristors to have turn-off capability for PWM operation with minimal switching losses. The proposed system can be used as a reactive power compensator with PWM operation for the utilitity application. There would be two advantages in the proposed system over the existing voltage source inverter. One is the low system cost due to using the conventional thyristors. Another is easy expansion of system operation voltage because th series operation of thyristor devices is already proven in HVDC system.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.5
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• pp.391-395
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• 2008

KEPCO 80MVA UPFC has been operated in Gangjin Substation since May 2003. This UPFC is composed of 40MVA shunt inverter and 40MVA series inverter, and developed in technical cooperation between Hyosung and Siemens. KEPCO has tried to localize UPFC control technique after its installation and developed GTO Thyristor Valve Test Equipment for annual maintenance test. The development of this equipment make it possible to process GTO Thyristor module test automatically and manage historic data systematically, which could improve UPFC reliability.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.387-392
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• 1986

DC motor is excellent in controllability and efficiency, but vulnerable in maintenance with respect to AC motor owing to the development of power devices and microelectronics, excellent AC motor drives which have characteristics as similar as DC motor's have been developed. Thyristor motor equipment that has an important role with Inverter in the field of AC motor drives was developed in the late 1960. There was no research about thyristor motor in Korea, then thyristor motor equipment was all imported. By this we started to develop in 1983, was tested in 1984, 1985. Now we express ourselves about thyristor motor equipment development procedure and characteristics.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.48 no.4
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• pp.219-225
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• 1999

This paper proposes a new reactive-power compensator composed of a thyristor current-source inverter. The compensator consists of a 6-pulse thyristor bridge, dc reactor, and a commutation circuit. The commutation circuit offers the thyristor bridge to have PWM operation with minimal switching losses. The operation of proposed system was analyzed by computer simulations with EMTP and experimental works with hardware scaled-model. The proposed system would have low cost and easy expansion of operation voltage due to using the conventional thyristors.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.45-53
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• 2003

For the improvement of welding performance, high-efficiency inverter system was designed and applied that system to the conventional large scale Flashbutt welder. The inverter systems are consists of full bridge PWM power control system and DSP controller. This inverter system has increased switching frequency of power control system of Flashbutt welder. For the test of application effects, we compared an our inverter control system with a conventional thyristor control system. In the results, we confirmed that our system has decreased the welding spatter amouts and improved welding performance.

• 전기의세계
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• v.25 no.4
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• pp.28-31
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• 1976

Thyristor는 많은 전력기기와 결합되어 전기기기 전반의 양상을 크게 변화시키고 있다. 예를 들면 변압기의 불꽃없는 탭이나 회전기의 정류자에 대치되는 무정류자전동기와 그리고 개폐기, 차단기의 대용등을 생각할 수 있다. 전력변환장치로서는 (1)직류전력을 조정하는 목적으로 Thyristor를 일종의 스위치로써 직류전압을 단속시켜 직류평균전력을 제어하는 DC Chopper (2)교류전원에 두개의 Thyristor를 역병렬접속하여 교류전류의 통전기간을 위상제어에 의하여 교류를 제어하는 AC Chopper (3)직류를 교류로 변환하는 자여식 inverter등이 있다. 본 해설에서는 지면관계상 D.C Chopper방식에 대한 기본회로와 그의 이용만을 취급한다.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.121-123
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• 1988

For the high speed drive of induction machine, Thyristor inverter utilizing line and device commutation is proposed. By investigating the load commutation conditions, the possible area of commutation is clearly shown. And from the above results, starting method under the constant slip frequency, is suggested.

• 전기의세계
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• v.23 no.6
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• pp.12-15
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• 1974