• Title, Summary, Keyword: adjustable speed generation system

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Adjustable Speed Control of Stand-Alone Wind Power Generation System using Squirrel-Cage Induction Generators (농형유도발전기를 이용한 독립형 풍력발전시스템의 가변속 제어)

  • Kim, Hyeung-Kyun;Lee, Kang-Ju;Lee, Dong-Choon;Seok, Jul-Ki
    • Proceedings of the KIEE Conference
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    • pp.338-340
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    • 2003
  • This paper proposes a stand-alone adjustable speed wind Power generation system using a cage-type induction generator. Indirect vector control is used, where the q-axis current controls the generator speed and the d-axis current controls the excitation level. The generator speed is adjusted according to the wind speed so as to produce the maximum output power. The generated power is charged in the battery bank through ac/dc PWM converter. The proposed scheme has been verified by the experimental results.

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Output Power Control of Wind Generation System by Machine Loss Minimization

  • Abo-Khalil Ahmed;Lee Dong-Choon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.51-54
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    • 2005
  • Generator efficiency optimization is important for economic saving and environmental pollution reduction. In general, the machine loss can be reduced by the decreasing the flux level, resulting in the significant reduction of the core loss. This paper proposesan model-based controller is used to decrement the excitation current component on the basis of measured stator current and machine parameters and the q-axis current component controls the generator torque, by which the speed of the induction generator iscontrolled according to the variation of the wind speed in order to produce the maximum output power. The generator reference speed is adjusted according to the optimum tip-speed ratio. The generated power flows into the utility grid through the back-to-back PWM converter. The grid-side converter controls the dc link voltage and the line-side power factor by the q-axis and the d-axis current control, respectively. Experimental results are shown to verify the validity of the proposed scheme.

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Sliding Mode Control of a New Wind-Based Isolated Three-Phase Induction Generator System with Constant Frequency and Adjustable Output Voltage

  • Moradian, Mohammadreza;Soltani, Jafar
    • Journal of Power Electronics
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    • v.16 no.2
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    • pp.675-684
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    • 2016
  • This paper presents a new stand-alone wind-based induction generator system with constant frequency and adjustable output voltage. The proposed generator consists of a six-phase cage-rotor induction machine with two separate three-phase balanced stator windings and a three-phase space vector pulse width modulation inverter that operates as a static synchronous compensator (STATCOM). The first stator winding is fed by the STATCOM and used to excite the machine while the second stator winding is connected to the generator external load. The main frequency of the STATCOM is determined to be constant and equal to the load-requested frequency. The generator output frequency is independent of the load power demand and its prime mover speed because the frequency of the induced emf in the second stator winding is the same as this constant frequency. A sliding mode control (SMC) is developed to regulate the generator output voltage. A second SMC is used to force the zero active power exchanged between the machine and the STATCOM. Some simulation and experimental results are presented to prove the validity and effectiveness of the proposed generator system.

Development of the Automation System for a fish Pump(I) -Adjustable Speed Control of a Fish Pump Using a Simplified PWM Inverter- (피쉬펌프의 자동화 시스템 개발(I) -간이화 PWM 인버터를 이용한 피쉬펌프의 가변속 제어-)

  • 정석권
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.35 no.3
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    • pp.328-334
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    • 1999
  • A fish pump makes very important roles in an automation system of an aquaculture farm, thus it has been used widely in order to transfer fishes from one place to the other place automatically. In spite of its significant roles, the efforts for developing performance and promoting efficiency of the fish pump are not sufficient yet. In this paper, a method which makes the fish pump automation system is suggested. Automation of the fish pump can be accomplished by using variable voltage and variable frequency inverter system including induction motors. Especially, very simple logic to generate Pulse width Modulation(PWM) wave to control induction motor efficiently and three steps speed control method to regulate liquid quantity of the fish pump simply are suggested. Owing to the simplifies speed control and PWM wave generation technique, a cheaper microprocessor, 80C196KC, than a digital signal Processor(DSP) can be used to operate control algorithm in induction motor systems for real time control Also, a new idea of remote control for the simplifies novel inverter system by Programmable logic Controller(PLC) without special output unit, digital to analog converter(D/A), is suggested in this paper. Consequently the function of reliability, availability and serviceability of the fish pump system are developed. It will be expected to contribute expanding of application of the fish pump in aquaculture farms because the system can reduce energy consumption and some difficulties according to manual operation prominently.

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Energy Storage And Power Compensation Based on Flywheel WRIM System (플라이휠 유도전동기 시스템을 이용한 에너지 저장 및 전력보상)

  • 김윤호;이경훈;박경수
    • Journal of the Korean Society for Railway
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    • v.2 no.4
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    • pp.32-39
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    • 1999
  • A flywheel system which can compensate electric power is presented. The designed system has a capability of providing real and imaginary power instantaneously as well as storing energy. In this paper, a control algorithm is designed. The designed algorithm is to control the secondary side current of the wound rotor induction motor using voltage-based PWM inverter. The flywheel system has advantages in converter size and power quality improvement comparing to the conventional system.

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UV/Thermal Hybrid Nanoimprint System for Flexible Substrates (유연기판을 위한 UV/Thermal 하이브리드방식 나노임프린트 시스템)

  • Lim, Hyung-Jun;Lee, Jae-Jong;Choi, Kee-Bong;Kim, Gee-Hong;Ahn, Hyun-Jin;Ryu, Ji-Hyeong
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.3
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    • pp.245-250
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    • 2011
  • An UV/thermal hybrid nanoimprint lithography system was designed and implemented for the pattern transfer to flexible substrates. This system can utilize a plate stamp, roll stamp, and film stamp. For all cases of using those stamps, this system is also switchable an UV or thermal nanoimprint lithography mode. This paper shows how to design the heating and UV curing plates and proposes how to change them easily. Because the pressure condition and the speed of the press roller varies by the characteristics of the stamp and substrate, all the parameters related to the nanoimprint lithography have to adjustable. Some transferred patterns are shown in this paper to verify the performance of the hybrid nanoimprint lithography system. The flexible substrates with nano-scale patterns on them will be key components for next generation technologies such as flexible displays, bendable semi-conductors, and solar cells.