• Journal of Drive and Control
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• v.13 no.1
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• pp.10-17
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• 2016

e-4WD(Electric-4WD) system is a 4WD(4-Wheel Drive) System that can transform a car into a Hybrid System. e-4WD consists of a Motor, Inverter, Speed reducer and Clutch. The Motor, Speed reducer and Clutch are installed on the rear sub-frame as a chassis module type. The inverter is installed separately. Compared to a mechanical 4WD, the e-4WD system has many advantages. For example, the reduced number of drivetrain components makes better use of the space. Driving with a motor only at low speed improves fuel economy and reduces exhaust gas. Engine downsizing is available because the motor assists the engine. The performance of a conventional HEV(Hybrid Electric Vehicle) system can also be maintained. This paper proposes the specifications of components and the control logic for an e-4WD System. And the effect of the e-4WD system is proven using a test vehicle equipped with components under various test conditions.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.2
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• pp.179-184
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• 2016

The electrical load testing system developed from this study was designed to control rated-capacity-testing or variable-load-testing in an active and precise manner and save electric energy during testing, and also to convert the saved electric energy through the electrical load testing system to grid line. As for the device under testing, it was designed to be applied to not only transformer, rectifier, voltage regulator, inverter which require grid voltage source but, also applied to electric power, aerogenerator, photovoltaic, hybrid generator, battery, etc. which do not require grid voltage source. The system was designed to return the power consumed during the testing to the grid line by connecting the synchronizing pwm inverter circuit to the grid voltage source, and was also made to enable the being-tested system from disuse of approximately 93.4% energy when compared to the conventional load testing system which has used the passive resistor.

• Proceedings of the KIPE Conference
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• 1996.06a
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• pp.121-123
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• 1996

교류전원은 직류전원과는 다르게 전력 이용 및 전달에 있어서 유효역률과 고조파의 영향을 분리하여 생각할 수 없다. 특히, 고조파의 영향과 전력전자의 발달과 더불어 그 문제점이 크게 부각되고 있다. 유럽을 중심으로 세계 각국에서는 규격제정(EN61000, IEC 519, IEEE 555 등) 과 규제 강화에 나서고 있다. 국내에서는 아직까지 크게 주목받지 않고 있으나, 전력의 효율개선, 양질의 전력공급 등의 측면에서 기술 향상에 필수적으로 고려되어야 할 분야이다. 이에 본 연구에서는 간단한 제어기 구성을 통해 병렬 인버터와 하이브리드 능동필터 개념을 도입하여 역률 개선, 고조파 저감 등을 통해 교류전력 품질 개선 장치을 구성하였다. 본 연구결과로 고압 대전력 전력변환장치의 무효 전력을 감소시켜 발전 전력의 효율적 이용과 부하측의 고주파 문제를 최소화 하는데 기여할 수 있을것으로 기대된다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.10
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• pp.1682-1687
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• 2016

Approximately 520thousand elevators are operating now in Korea, about 40% ~ 60% of the elevator power is generated. In this paper, by using the method of adding regeneration power of the elevator to the grid-tied photo voltaic inverter, PV generation that was dependant on the solar radiation was significantly improved. In order to confirm this, the regeneration power of the elevator has been simulated in 12% of the rating load, and measured the regeneration power of the elevator in the actual condition to assess the differences of it. The 5[kW] hybrid grid-tied photo voltaic invertor has been fabricated to conduct an experiment for the confirmation of the proposing method. The effectiveness of the proposing method has been reassured with the result of experiment that include the transfer interface part of the regeneration power of the elevator.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.428-430
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• 2008

연료전지차 및 하이브리드차용 전기구동시스템의 냉각성능은 차량의 동력성능을 보장하기 위한 중요한 요소이다. 각 단품의 성능 확보를 위해 냉각수를 허용 온도 이하로 관리해야 하며 이때 라디에이터 방열량과 냉각수 유량이 중요 변수가 된다. 본 논문에서는 현대자동차 연료전지차량의 모터, 인버터를 포함한 100kW 전기구동시스템의 최적 냉각 설계를 위하여 차량주행모드에 따른 전기동력부품의 발열량을 이론적으로 산출하고, 시험을 통하여 냉각시스템의 성능을 검증하였다.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1334-1339
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• 2004

This paper proposes transformerless power conversion system consisting of a single-phase diode rectifier and a shunt hybrid filter for the electric-railway system. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multi-level inverter. Compared with conventional active filters. Transformers are not used. Also, LC filter works as not only a harmonic filter tuned at the 5th harmonic frequency but also a switching-ripple filter. The rating of the active filter can be decreased by using a NPC type multi-level inverter. The simulation results confirm the validity of the system.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1427-1432
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• 2004

This paper proposes transformerless power conversion system consisting of a single-phase diode rectifier and a shunt hybrid filter for the electric-railway system. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multi-level inverter. Compared with conventional active filters. Transformers are not used. Also, LC filter works as not only a harmonic filter tuned at the 5th harmonic frequency but also a switching-ripple filter. The rating of the active filter can be decreased by using a NPC type multi-level inverter. The simulation results confirm the validity of the system

• Journal of Advanced Marine Engineering and Technology
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• v.11 no.2
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• pp.37-50
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• 1987

In an effort to conserve electric power, variable voltage variable frequency pulse width modulated (PWM) inverters are being applied increasingly to the variable speed control of the induction motors. The use of the PWM technique in motor drive applications is considered advantageous in many ways. For industrial applications, the PWM drive obtains its DC input through simple uncontrolled rectification of the commercial AC line and is favored for its good power factor, good efficiency, its relative freedom regulation problem, and mainly for its ability to operate the motor with nearly sinusoidal current waveforms. The purpose of this paper is to design a three phase natural sampled PWM inverter using microprocessor with simple control algorithm and hybrid control circuit has been built to implement this PWM scheme. In this system, the microprocessor can be used only for calculations directly related to motor control tasks by the design of hybrid circuit which sends PWM signals to the motor.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.102-103
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• 2019

본 논문에서는 3상 다이오드정류회로로 구성된 AC-DC 컨버터, 그리고 인버터로 구성된 고용량 교류전동기의 구동시스템에 있어서 돌입전류제한용 저항과 직류링크 과전압방지용 회생저항의 2가지 기능을 하나로 묶은 하이브리드 저항을 이용한 직류링크회로와 이에 대한 시퀀스제어를 제안한다. 이를 통해 기존 직류링크회로에 비하여 가격경쟁력을 갖추고 돌입전류 및 과전압을 효율적으로 제어할 수 있도록 하고, 시뮬레이션해석을 통하여 이에 대한 유효성을 검증한다.

• Journal of the Korean Society for Railway
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• v.7 no.4
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• pp.339-344
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• 2004

This paper proposes transformerless power conversion system consisting of a single-phase diode rectifier and a shunt hybrid filter for the electric-railway system. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multi-level inverter. Compared with conventional active filters. transformers are not used. Also, LC filter works as not only a harmonic filter tuned at the 3rd harmonic frequency but also a switching-ripple filter. The rating of the active filter can be decreased by using a NPC type multi-level inverter. The simulation results confirm the validity of the system.