• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.146-148
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• 2006

This paper deals with a simple structured power quality disturbance generator for nonlinear load devices. The proposed generator can be applied to the performance test of custom power devices. Voltage sag, swell, outage, unbalance and phase jump after outage are provided by the generator. The improving phase jump operating principle of the generator is described and analysed. The usefulness of the generator is verified through simulation.

• 전기학회논문지P
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• 제65권4호
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• pp.268-272
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• 2016

A brush-less type synchronous generator is driven by an internal-combustion engine that is used for emergency source. This kind of generator has to maintain output voltage in a range of some degree under the abrupt load irregular conditions such as a full load trip. This paper suggests a suppression method of increasing the output voltage over the rating. Automatic voltage regulator detects excessive rising of output voltage of the generator and supplies the signals to a switch installed in the rotating exciter through the photo-coupler. The current of main field rapidly decreases by additional resistor of the main filed circuit. Therefore, the output voltage of the generator is maintained effectively. The experimental results verified that the excessive value of the output voltage is limited in the range of 7% of the rated voltage.

• Journal of Advanced Marine Engineering and Technology
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• 제15권2호
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• pp.53-63
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• 1991

This study suggests a new type shaft generator driven by hydraulic power suitable for small size vessels. Since the shaft generator system is very easy to be affected by disturbances such as speed variation of main engine and load variation of the generator, a robust servo control must be implemented to obtain stable electric power with constant frequency. Thus, in this study two types of controller design method-the reference following optimal control method and robust servo control method-are adopted to the controller design. In the experiment, static and dynamic characteristics of the shaft generator system according to the variation of input frequency setting, the speed variation of the pump and the load variation of the generator are investigated. From the considerations on the computer simulation results and experimental results, it is ascertained that the shaft generator system proposed in this study has good control performances.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1469-1470
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• 2015

Recently induction generator has been applied to many small hydro power plants. Induction generator needs a reactive power for magnetization. The reactive power of induction generator is being supplied from the supply side mostly. The use of induction generators in the power distribution grid can affect the power factor. The power factor of induction generator is fixed already during production. The power factor in the distribution system is due to the increase or decrease of the load rather than due to the induction generator. In this study, we analyzed how the power factor is changed according to the load increase or decrease in the distribution lines.

• Journal of international Conference on Electrical Machines and Systems
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• 제3권1호
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• pp.15-19
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• 2014

As the space of the wind power generator stator end is limited, it is difficult for us to place the inner evaporative cooling system in it. We use the non-overlapping concentrated windings scheme to solve the placing and cooling problem. The characteristic of a 5MW direct-driven permanent magnet generator with non-overlapping concentrated windings were analyzed under no-load, rating-load and short-circuit by (Finite Element Method) FEM for verification of design. We studied the connection methods of the stator windings and designed the end connection member. The heat dissipation of the stator end was simulated by FEM, the result showed that the end cooling could satisfy the wind generator operation needs. These results show that the direct-driven permanent magnet wind power generators with non-overlapping concentrated windings and inner evaporative cooling system can solve the cooling problem of wind power generator, and obtain good performance at the same time.

• 전력전자학회논문지
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• 제12권3호
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• pp.213-220
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• 2007

고속 부하특성을 갖는 장비들이 일반화되면서 탑재형 발전기는 빠른 응답특성을 만족시켜야 한다. 본 논문은 고속 부하용으로 개발된 단극 발전기의 모델링, 시뮬레이션 및 실험 등을 기술한다. 입력 제한기가 있는 단극 발전기의 시뮬레이션 모델이 만들어졌고, 응답특성을 개선하는 최적 이득이 시뮬레이션 및 분석을 통해 결정된다. 최적 이득값을 적용하여 개발된 발전기의 향상된 대역폭 및 안정성이 시뮬레이션과 실험으로 입증되어졌다.

• 한국정보통신학회논문지
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• 제21권3호
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• pp.613-619
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• 2017

본 논문에서는 PMS(Power Management System) HILS(Hardware In the Loop Simulaition) 가상 제어기 환경 구축을 위하여 디젤과 LNG를 연료로 사용가능한 DF(Dual Fuel) Generator를 MATLAB/SIMULINK 기반으로 모델링을 수행하고 시뮬레이션 결과 모니터링이 가능한 인터페이스를 구현하였다. DF Generator의 주요 구성은 기계적 동력을 공급하는 DF 엔진과 기계적 동력을 받아 전력을 생산 및 공급을 하는 동기발전기가 있다. DF 엔진의 서브모델은 throttle body, intake manifold, torque generation 그리고 mass of LNG and diesel quantity 가 있다. 또한, 단일 용량을 초과하는 전체 부하를 공유하기 위하여 병렬 연결된 DF Generator 와 governor 모델을 이용하여 부하 분담 시스템을 구현하였다. 시뮬레이션 결과와 가상 부하에 따른 예상 결과의 비교를 통해 DF Generator 모델의 신뢰성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.193-196
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• 1999

The current boost type atatic excitation system for synchronous generator that can sustain prope output voltage level even at fault condition is proposed. The proposed excitation system is capabl of supplying level 60% of the rated voltage. The proposed system is verified and tested using computer simulations as well as load tests. The load tests are performed with a 5KVA synchronous generator driven by a ac motor. The actual tests results indicated a good performance.

• 대한기계학회논문집
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• 제18권8호
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• pp.2167-2176
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• 1994

This paper presents some useful design criteria for the turbine cogeneration system through both the design and off-design analysis. Comparative analysis of the part load performance is carried out for several gas turbines which have different design parameters represented by the turbine inlet temperature and pressure ratio. It is shown that the variation in part load efficiency considerably depends on the design parameter. The off-design operation of the heat recovery steam generator is simulated by introducing adequate assumptions for the heat transfer process. It is turned out that the design parameters of heat recovery steam generator should be determined by considering the favorable operation at the off-design conditions.

• 조명전기설비학회논문지
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• 제27권6호
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• pp.9-16
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• 2013

This paper presents an operating characteristics of the 5-phase 5kW with developed the surface permanent magnetic synchronous generato (SPMSG) in order to make a study of a polyphase ac motors keeping hold of more advantages. There are shown a amplitude and waveform of the generated electromotive force, in FFT analysis of harmonics, within output voltages, and reviewing a experiment results in no-load test, resistive load, and inductive load using 5-phase induction motor by variable output frequency. The operating characteristics of the developed manufacturing generator include voltage regulation, efficiency, power factor, THD, and so on at rated load.