• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.848-849
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• 2015

This paper presents the structure design for optimizing output power density and efficiency to develop a spoke-type interior permanent magnet synchronous generator (IPMSG). To obtain the optimal structure, the combination of response surface method (RSM) and 2-D finite element analysis can solve the problem effectively for reducing the volume of permanent magnets (PMs) and maximizing the ratio between power density and efficiency. The effectiveness of this proposed structure design is verified by the simulation and experiment according to the comparison of the electromagnetic characteristics between the initial and modified structure.

• Journal of Power Electronics
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• v.11 no.4
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• pp.527-532
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• 2011

Due to the need for improved fuel consumption and the trend towards increasing the electrical content in automobiles, integrated starter generator (ISG) systems are being considered by the automotive industry. In this paper, in order to change the conventional generator of a vehicle, a belt driven integrated starter generator is considered. The overall ISG system, the design considerations for the claw pole type AC electric machine and a low voltage very high current power stage implementation are discussed. Test data on the low voltage claw pole type machine is presented, and a large current voltage source DC/AC inverter suitable for low voltage integrated starter generator operation is also presented. A metal based PCB (Printed Circuit Board) power unit to attach the 4-parallel MOS-FETs is used to achieve extremely high current capability. Furthermore, issues related to the torque assistance during vehicle acceleration and the generation/regeneration characteristics are discussed. A prototype with the capability of up to 1000 A and 27 V is designed and built to validate the kilo-amp inverter.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.5
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• pp.724-729
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• 2016

Nowadays high-cost energy storage system using flywheel or secondary battery is applying to hybrid generation system with WT(Wind Turbine) and diesel generator in island areas for stable operation. This paper proposes an operating algorithm and modeling method of the hybrid generation system that can operate for variable wind speed and load, which is composed of energy storage system, variable-speed PMSG(Permanent Magnet Synchronous Generator) WT and diesel generator applied in island areas. Initially, the operating algorithm was proposed for frequency and voltage to be maintained within the proper ranges for load and wind speed changes. Also, the modeling method is proposed for variable speed PMSG WT, diesel generator and BESS(Battery Energy Storage System). The proposed operating algorithm and modeling method were applied to a typical island area. The frequency and voltage was kept within the permissible ranges and the proposed method was proven to be appropriate through simulations.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.723-725
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• 2002

In this paper, The basic design and the steady-state performances of a high-speed permanent magnet synchronous motor/generator (PMSMG) for gas-turbine are presented. For deveoping a high-speed machine, it must be taken account into the mechanical view as well as the electrical because of high centrifugal force of a rotor. Based on considering those, this paper deals with the characteristics of generating mode and motoring mode from a electrical point of view.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.6
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• pp.951-958
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• 2008

This paper describes development of hardware simulator for the PMSG wind power system, which was designed considering wind characteristic, blade characteristic and blade inertia compensation. The simulator consists of three major parts, such as wind turbine model using induction motor, PMSG generator, converter-inverter set. and control system. The turbine simulator generates torque and speed signals for a specific wind turbine with respect to given wind speed. This torque and speed signals are scaled down to fit the input of 2kW PMSG. The PMSG-side converter operates to track the maximum power point, and the grid-side inverter controls the active and reactive power supplied to the grid. The operational feasibility was verified by computer simulations with PSCAD/EMTDC, and the implementation feasibility was confirmed through experimental works with a hardware set-up.

• Journal of Power Electronics
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• v.13 no.2
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• pp.313-321
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• 2013

This paper describes the operation analysis results of a communication-based DC micro-grid using a hardware simulator developed in the lab. The developed hardware simulator is composed of distributed generation devices such as wind power, photovoltaic power and fuel cells, and energy storage devices such as super-capacitors and batteries. Whole system monitoring and control was implemented using a personal computer. The power management scheme was implemented in a main controller based on a TMS320F28335 chip. The main controller is connected with the local controller in each of the distributed generator and energy storage devices through the communication link based on a CAN or an IEC61850. The operation analysis results using the developed hardware simulator confirm the ability of the DC micro-grid to supply the electric power to end users.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1296-1297
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• 2011

This paper deals with a power-hardware-in-the loop simulation (PHILS) of permanent magnet synchronous generator (PMSG) type wind power generation system (WPGS) using a real hardware which consists of a motor generator set with motor drive, real time digital simulator (RTDS), and back-to-back converter. A digital signal processor (DSP) controls the back-to-back converter connected between the back-to-back converter and the RTDS. The proposed PHILS can effectively be applied to demonstrate the operational characteristics of PMSG type WPGS under grid connection.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1324-1325
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• 2011

본 논문은 영구자석을 사용한 풍력발전기의 특성해석 기법에 관한 기초적인 연구로 시뮬레이션 해석기법을 적용하였다. 해석을 위한 발전기 모델은 SPMSG(Surface-Mounted Permanent Magnet Synchronous Generator; 표면 부착형 영구자석 동기발전기)로 선정하였으며 정격출력은 750[kW], 정격회전속도는 25[rpm]rpm의 사양을 가지는 발전기의 특성에 관하여 해석을 수행하였다. 설계 및 해석 과정에서 영구자석의 형상을 주요 변수로 설정하고 자속밀도의 균일한 분포와 풍력 발전기의 정속운전 상태에서 발생하는 전기자 권선의 역기전력 파형을 확인하여 고조파 성분을 저감하는 것에 중점을 두고 특성해석을 수행하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.427-431
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• 2007

본 논문에서는 750 kW 풍력발전용 인버터를 개발한 결과와 2년 동안의 현장실증을 통하여 얻어진 경험을 바탕으로 2 MW 영구자석형 동기발전기(PMSG, Permanent Magnet Synchronous Generator)의 전력변환을 위한 병렬형 인버터의 시뮬레이션과 이를 통한 설계와 제작 및 기본시험 과정을 소개하고자 한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1058-1059
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• 2015

This paper describes a low-voltage ride-through method for the permanent magnet synchronous generator (PMSG) wind turbine system at a grid fault. The generator side converter regulates the DC link voltage instead of the grid side converter by storing the surplus active power in the rotor inertia during grid fault by the sliding mode controller. The grid side converter controls the grid active power keeping a maximum power point tracking. Simulation results for small scale PMSG wind turbine verify the efficiency of the control method.