• Proceedings of the KIPE Conference
• /
• 2012.07a
• /
• pp.295-296
• /
• 2012

세계적으로 화석연료에 의한 환경 문제로 인하여 연비가 개선된 전기자동차에 대한 관심이 날로 증가하고 있다. 본 논문에서는 친환경이면서 대용량 수송이 가능한 직렬형 CNG-하이브리드 바이모달 굴절차량에 적용되는 추진용 전장품을 개발하였다. 또한 전장품을 차량에 장착하여 운전 모드에 따른 차량의 주행시험을 통해 차량의 구동 성능 및 전장품의 제어성능을 확인하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.25 no.11
• /
• pp.930-937
• /
• 2012

Newly developed Series hybrid low-floor articulated vehicle which can meet both road and railway running conditions. It has the rated driving speed of 80 km/h and three driving modes with hybrid(engine+battery) driving mode, engine driving mode, battery driving mode. The battery driving mode requires the several 10 km running without additional charging operation. The vehicle has been equipped with LPB (lithium polymer battery) pack for the series hybrid propulsion system. LPB pack consists of 168 cells (3.7 V in a cell, 80 Ah) in series, DC Circuit breaker, mechanical rack, BMS (battery management system). This paper has shown the design process of LPB pack and application to the vehicle. Driving results in the road was successful to be satisfied with the requirement of the series hybrid vehicle.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.5
• /
• pp.484-492
• /
• 2000

In this paper, a voltage compensator with harmonic current compensating capability is studied and its compensating characteristics are analyzed. Like the hybrid active power filter, the proposed system is composed of parallel LC passive filter and series PWM converter connected to power line through series transformer. It is shown that the compensation of harmonic current generated due to nonlinear loads such as diode rectifier and instantaneous voltage compensation of the source are performed through the proposed compensating system. The operating principle of the proposed system is described through a single-phase equivalent circuit and the control strategy is suggested on the d-q rotating reference frame of the 3-phase system. Also, experiment is carried out to verify compensating characteristics of the proposed system.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.43 no.12
• /
• pp.1097-1107
• /
• 2015

General VTOL aircraft uses gas turbine engine which has high power to weight ratio. However, in the VTOL UAV in small sector, the gas turbine as a prime mover is not adequate because of the limitation of the high fuel consumption ratio of the gas turbine. In this research, The Series Hybrid-Electric Propulsion System(SHEPS) has been proposed and technology survey & comparison analysis has conducted to constitute propulsion system for engine, electric motor and battery. To achieve this object a 65kg-class P-UAV from "Company I" was used. And to estimate the validity of power control algorithm and developed power management control, Matlab/simulink$^{(R)}$ has been used for the simulation. As a result, the developed algorithm worked comparatively well and the research has predicted that SHEPS was satisfied enough for 7 hour of endurance for mission profile.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.6
• /
• pp.74-79
• /
• 2019

The military vehicle produces electric power through an engine-integrated serial hybrid generator that is connected to the engine and does not have a separate generator installation space. However, depending on the mechanical characteristics of the connection between the generator and the engine, iron oxide for internal rusting and lubrication grew scattered. The iron oxide is adhered to the starter to deteriorate the starting performance, and there is a problem that the noise of the leg due to wear of the gear is increased. To solve this problem, the connection spline material and the surface treatment of the engine were improved and the shape was changed to a grease sealing type to prevent the generation of iron oxide inside. As the shape of the generator connector composing the shafting system was changed, the integrity of the structure was confirmed through the torsional endurance test. In addition, through the actual vehicle load test, it was verified that no corrosion occurred during the target life span without internal corrosion. It was confirmed that the anti-scattering structure of the grease effectively suppresses the generation of iron oxide, thereby reducing the noise generated from the generator. In this paper, we propose a fundamental solution to the degradation of the starter and the noise generation by preventing the back corrosion caused by the serial hybrid generator installed between the engine and the transmission.

• Proceedings of the KIPE Conference
• /
• 2010.07a
• /
• pp.190-191
• /
• 2010

본 논문은 전기자동차 (Electric Vehicles, EVs) 및 플러그인 하이브리드 자동차 (Plug-In Hybrid Electric Vehicles, PHEVs)용 리튬 이온 (Li-Ion) 배터리 충전을 위한 3.3 kW급 차량 탑재형 (On-Board) 충전기 하드웨어의 설계 및 제작에 대하여 기술한다. 차량 실장 특성을 고려하여 부하직렬공진형 dc-dc 컨버터를 적용하고, 80-130kHz의 고주파 스위칭 및 ZVS (Sero-Voltage Switching) 기법을 통해 수동소자의 크기를 최적화하여 5.84L, 5.8kg의 저부피, 경량을 달성한다. 전자부하를 대상으로 정전류 (Continuous Current, CC) 및 정전압 (Continuous Voltage, CV) 제어를 수행하여 93%의 고효율 획득 및 성능을 검증한다.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.16 no.2
• /
• pp.225-232
• /
• 2013

In this paper, the study was conducted on the subject of the hybrid electric vehicles used by the military, and optimized the propulsion system for fuel economy considering energy supply to the mission equipments. For the analysis of the vehicles, a method based on the geometry and some assumptions was applied with basic vehicle dynamics. The sources of energy supply in the military hybrid electric vehicles are an engine, a battery and an ultra-capacitor. The optimal operation point among an engine, a battery and an ultra-capacitor can be found by minimizing energy consumption of driving power train and mission equipments. In the study, it was possible to find the optimal propulsion system by comparing fuel efficiency of the vehicles during the driving cycle.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.11 no.5
• /
• pp.163-169
• /
• 2003

Modeling of engine-generator system and its control responses are investigated using high performance generator controller. The nonlinear engine is modeled using mean torque production model based on experimental engine map. In case of diesel engine. the amount of injected fief is decided by engine controller depending on the APS(Acceleration Position Sensor) value. An electromechanical generator model contains electrical circuits and moment of inertia. The generator controller maximizes the performance of generator using decoupling and linearized current feedback control. The generator control system consists of 3-phase IGBT inverter and controller board based on 32 bit floating point DSP. Field oriented control algorithm with digital current feedback control at 10kHz sampling enabled high performance torque and speed control of induction machine. Not only the steady state but also the transient state responses can be evaluated through a batch test of the engine generator system. Developed engine and generator modeling and control can be utilized in various applications such as Series Hybrid Electric Vehicle(SHEV), engine-generator for emergency, and other hybrid generation systems.

• Proceedings of the KIPE Conference
• /
• 2000.07a
• /
• pp.739-743
• /
• 2000

With significant development of power electronics technology the proliferation of nonlinear loads such as such as static power converters has deteriorated power quality in power transmission distribution systems. Notably voltage harmonics resulting from current harmonies produced by the nonlinear loads have become a serious problem in many systems Moreover momentary interruptions and voltage sags are responsible for many of the power quality problems found in typical industrial plants. Int his paper proposed 3 phase hybrid series active power filter is not only for harmonic compensation but also for harmonic isolation between supply and load and for voltage regulation and imbalance compensation Through computer simulations we have verified the effectiveness of the proposed system.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.393_394
• /
• 2009

초전도한류기(SFCL)는 고장전류에 대한 초고속 감지, 고장전류 제한이 가능하고, 정상계통에서는 무손실 운영이 가능한 신개념의 기기이다. 공급신뢰도 측면에서 SFCL은, 고장전류 저감으로 송전을 지속할 수 있는 장점이 있는 반면, 기존 계통에 직렬연결되므로 자체 고장으로 인해 공급신뢰도를 악화시킬 수도 있다. 특히, 고속스위치를 필요로 하는 하이브리드형 SFCL의 경우 계통연계 이전에 SFCL 자체의 신뢰성이나 주위 계통에 미치는 영향을 미리 검토해야 한다. 본 논문에서는 SFCL의 신뢰도 데이터를 계산하는 기법과 SFCL 인근 설비의 신뢰도 데이터를 갱신하는 방법에 대해 제시하였으며, 이는 SFCL가 연계된 배전계통의 수용가 공급신뢰도를 산출하기 위해 필요한 사전단계에 해당한다.