• Journal of Advanced Marine Engineering and Technology
• /
• 제36권6호
• /
• pp.780-787
• /
• 2012

일반적으로 파력진동발전기는 부양 체, 진동시스템, 선형발전시스템으로 구성된다. 기존의 파력 진동발전기는 진동시스템과 파도에너지가 갖는 주파수를 일치시켜 공진현상을 이용하여 에너지효율을 극대화하였다. 그러나 파도에너지가 갖는 주파수는 시시각각 변하기 때문에 공진을 이용하여 파도에너지를 효율적으로 얻는 것은 어렵다. 본 논문에서는 이러한 단점을 해결하기위해 파력 발전기를 구성하는 부양 체와 진동시스템에 대하여 연구하였다. 먼저 파도에너지가 갖는 중심주파수에서 공진이 발생되도록 바다에 떠있는 부양 체를 설계하였고, 진동시스템과도 공진이 발생되도록 진동시스템을 설계하였다. 그 결과 일정 주파수대역에서 파력진동발전기를 구성하는 부양 체와 영구자석사이의 상대속도는 증가한 반면 부양 체와 바닷물사이의 상대변위는 작아짐을 알 수 있다. 따라서 본 논문에서 제안한 방법은 기존 방법에 비해 부양 체와 바닷물사이의 상대변위가 작기 때문에 극한 바다 주변 환경으로부터 부양 체의 안정성을 확보할 수 있고, 시시각각 변하는 주파수를 갖는 파도에너지로부터도 더 많은 운동에너지를 얻을 수 있는 장점을 가진다.

• Journal of information and communication convergence engineering
• /
• 제5권3호
• /
• pp.223-228
• /
• 2007

This paper deals with the secondary excited induction generator applied to random wave input generation system. As it is preferred to stabilize the output voltage and frequency in the constant level, microcomputer controlled CSI connected to the secondary windings supplies the secondary current with slip frequency. For testing this method, the input torque simulator is constructed, according to the power flow analysis. The experimental and numerical results show the advantage of secondary excited induction generator system for the random input wave generation system.

• 전력전자학회논문지
• /
• 제8권5호
• /
• pp.435-441
• /
• 2003

순시전압강하보상기 (DVR)는 순시전압강하 및 상승을 보상하기 위한 가장 효과적이고 경제적인 수단으로 알려져 있다. 본 논문은 계통의 전압이 사고에 의해서 심하게 왜곡되는 경우에서도 계통과 동기된 정현적인 기준파를 생성하는 방법을 제시한다. 제안된 기준파발생기 (RWG)는 사고로 왜곡된 전압으로부터 원래의 정현적인 파형을 추출하고 정상 성분만의 전압을 합성하여 DVR의 제어에 사용하도록 한다. 전윈 전압의 사고 순간에도 RWG는 과도적인 문제가 없는 안정된 정현 파형을 출력한다.

• 한국산업융합학회 논문집
• /
• 제23권6_2호
• /
• pp.999-1006
• /
• 2020

This study was conducted to develop an efficiency prediction program of a hydraulic secondary energy converter for calculating annual power generation of a Wavestar type wave power generator. Using the period and wave height obtained from the frequency domain analysis, the behavior of the floating body was obtained by assuming the sin function. The piston displacement and speed of the hydraulic cylinder were calculated considering the behavior of the floating body and the shape of the mechanism. The numerical simulation of the hydraulic system was performed by physically modeling the hydraulic cylinders, check valves, hydraulic motors, which are the main devices. In the future, this analysis program will be used to develop a program for estimating annual power generation of a moveable body type wave power generation device.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
• /
• pp.167.1-167.1
• /
• 2011

Sustainable energy generation is becoming extremely imperative due to the expected limitations in current energy resources and to reduce pollution. Especially, because of its considerable energy potential, ocean wave energy has been investigated with regard to power generation. To develop large high power wave generator system, it is important to make a small scale proto type and to test that. Thus the objective of this research is to examine the characteristics of a mechanically excited generator system having small power capacity experimentally. The water reservoir (4 m length, 1.5 m width and 1.8 m depth) having a wave maker to make arbitrary height and period of the water wave was made. The proto type consists of three main parts; a buoy, rack-pinion base one-way mechanism, and a wave generator(Fig.1). The water wave is going up and down and the hexahedron buoy is following the wave. The rack gear attached to the buoy is also going up and down to roll the pinion connected to an electric generator then it produces electricity. The experiments were performed with several conditions of water waves, and the power outputs over 30 W could be measured for some conditions. In future works, to achieve higher performance for the proto type, the effects of primary parameters (buoy shape and mass, etc.) on the system efficiency will be identified.

• 한국산학기술학회논문지
• /
• 제21권2호
• /
• pp.19-24
• /
• 2020

화석 연료의 고갈로 인해 신재생 에너지에 관한 관심이 증가하고 있다. 특히, 예측가능성이 높고 이용 가능한 양이 풍부한 파력에너지 (Wave Power Energy)에 관한 연구가 활발히 진행되고 있다. 본 연구에 사용된 동축 가속형 파력 발전장치 (Coaxial Accelerator Type Wave Power Generator)는 양방향 선형 운동을 회전력으로 변환함으로써 발전 효율을 향상시킬 수 있도록 설계되었다. 본 연구에서는 해양공학수조에서 파를 생성 한 후, 파주기 및 파고에 따른 케이스 실험을 수행하였다. 실험 연구의 결과는 주파수 응답과 관련된 이론적인 방법을 통해 검증하였으며, 전반적인 경향이 일치하는 것을 확인하였다. 본 연구의 결과는 제작 전 설계 단계에서 파력 발전기의 전력을 예측하고 파력에너지의 효율을 개선하기 위한 매개 변수를 연구하는데 유용할 것으로 예상된다. 또한 제조업체는 본 연구의 결과를 통해 파력 발전기의 파력 에너지 효율을 예측하여 시행착오방지를 통해 개발 시간과 비용을 절감할 수 있을 것으로 기대할 수 있다.

• 조명전기설비학회논문지
• /
• 제28권5호
• /
• pp.82-91
• /
• 2014

The combined generator system by integrating several renewable energy sources can share the electrical infrastructure and therefore have the advantage of constructing not only the transmission system but also the power conversion system. Among the various combined renewable system, the wind power and wave power has a high possibility of future growth due to the economic feasibility in offshore environment. This kind of large-scale combined systems might be follow the determination by the transmission system operator's directions and control the output profile by focusing at PCC. However, both renewable energies are depend on the unpredictable environmental variation; it is needed to do the compensation devices. In this paper, the ESS compensation plan is proposed to do output determination of the combined generator system by paying attention to active power of utility grid with the analysis of the controllable elements of the wind and wave power generator. The improvement of the new application technique of the combined system is confirmed through using the PSCAD/EMTDC. The entire simulation process was designed by adopting the active power control according to the reference signal of TSO.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 기술교육전문연구회
• /
• pp.169-173
• /
• 2003

In this paper, we present a design and experiment study of high power large diameter backward wave oscillator. Analysis is made within the scope of linear theory of absolute instibility. The Electron beam generator may be atteractive source of high power millimeter microwaves which has simpler structure.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 추계학술대회 초록집
• /
• pp.171-171
• /
• 2010

An innovative design of a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), named HSTWEC, is presented in this paper. The system is designed to convert ocean wave fluctuation into electricity by using the HST circuit and an electric generator. Based on the floating-buoy concept, the wave forces the sub-buoy to move up and down. Consequently, the electric power can be obtained from the generator in both the moving directions of the sub-buoy through the HST circuit as shown in Fig. 1. In order to investigate the HSTWEC operations, a mathematical model of the system is indispensible. In addition, the method to control the HSTWEC, including: pump displacement control, tension adjustment control and ballast weight control, is also discussed in this paper. Finally, the design concept as well as simulation results indicated that this HSTWEC design is an effective solution and possible to fabricate for wave energy generation.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.856-857
• /
• 2008

Wave power generation as an environmentally -friendly energy has received the attention. In this paper, therefore, the tubular type Permanent Magnet Linear Synchronous Generator (PMLSG) is proposed for wave power generation. The characteristics of tubular type PMLSG are investigated by analysis using a Finite Element Analysis (FEA). Moreover, the operating performance of generator under no-load and load with variable resistance is examined. And Taguchi method is applied for considering tolerance in manufacture. The results of FEA show that proposed tubular type PMLSG is a useful solution for small-scale wave power generation.