• 에너지공학
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• 제28권1호
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• pp.65-72
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• 2019

한국정부는 재생에너지를 이용한 발전량 비중을 2030년까지 총 발전량의 20%까지 높이겠다는 목표를 제시하였다. 풍부한 해양 신재생에너지 자원은 한국정부가 이 목표를 달성하는데 중요한 역할을 할 수 있을 것이다. 이 논문은 1.0 m/s의 낮은 유속에서도 높은 효율을 달성할 수 있는 유동유발진동 현상을 이용한 조류에너지 발전기술을 소개하고 한국 7개 해안의 평균유속을 바탕으로 높은 효율을 달성할 수 있는 유동유발진동 발전기의 최적 설계를 제안하고자 한다. 또한, 이를 바탕으로 각 해안에서 발전할 수 있는 이론적 잠재량을 산정하고자 한다. 유동유발 발전기술을 이용한 연간 이론적 최대발전량은 221.77 TWh로 예측되었고 이는 2013년 한국의 총 전력소비량의 42.3%에 해당한다. 본 연구결과는 유동유발진동을 이용한 발전기술을 이용한 조류발전기술이 한국 정부가 제시한 목표를 달성하는데 중요한 역할을 할 수 있음을 보여준다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.159.2-159.2
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• 2011

Hyundai Heavy Industries has developed a tidal current energy converter utilizing the accumulated technology as the world largest constructor for ship and offshore structures. The model has two sets of turbines in both ends in order to utilize the bi-directional current flows in flood and ebb tide. The torque produced by turbine in tidal current is directly delivered to generator along the horizontal axis, in which the turbine, gear, generator, gear and turbine are connected successively. The manufactured model for field test has the turbine diameter of 5 meters to produce the maximum power of 500kW at maximum current speed of 5m/s. The technical verification of tidal power converter was performed by means of small scale model test in towing tank as well as field test at the Strait of Uldolmok located in Jindo of Jeollanamdo province. Field test was performed by mounting the tidal current converter on the SEP(Self Elevating Platform) which could lower the 4 vertical legs on the seabed and could elevate platform over the water surface using the hydraulic power for itself. The field test performed for a month shows that power output is similar or larger compared with the expected one in design stage. This paper presents the development of tidal current energy converter and real sea field test by Hyundai Heavy Industries. This project has finished successfully and provided the technical advance toward commercial services for tidal current power generation in the south-west region in Korea.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.644-647
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• 2007

We have developed electrical power train for 1MW tidal current plant which is composed of both 500kW tidal current plant with doubly-fed induction generator and 500kW tidal current plant with synchronous generator. To check performances of the protype, 2MW dynamometer is used to simulate a helical turbine, and then protype generator and converter are coupled with the dynamometer separately. From the suggested experimental results it is reconfirmed that two kinds of the power train to be installed at the Uldolmok located at southwestern shore in Korea are able to operate under all kinds of the condition about speed and power.

• 신재생에너지
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• 제9권4호
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• pp.19-24
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• 2013

In order to analyze the characteristics of tidal current power generation system, we measured output power in M-G Set (Motor-Generator Set) and MATLAB/Simulink. We installed M-G Set (Motor-Generator Set) and did a simulation using MATLAB/Smulink. The simulation consisted of the tidal current turbine, PMSG, converter, and three-phase PWM inverter. Also, the speed control of the generator was performed using machine side converter. And we measured output voltage, current, power of the generator and the output power of three-phase PWM inverter.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.507_508
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• 2009

As a result of environmental concerns, renewable energy systems are rapidly increasing and particularly tidal current is a potential source of energy. In accordance with a large-capacity trend, doubly-fed induction generator is applied such as wind farms and tidal systems. In this paper, Optimal hysteresis band amplitude of CRPWM Converter is determined for improving rotor current waveform and electrical quality.

• 신재생에너지
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• 제9권1호
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• pp.44-50
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• 2013

In order to analyze the characteristics of tidal current power generation system, we measured the output power according to the stream velocity by a water tunnel system and a simulation in MATLAB/Simulink. The water tunnel system consisted of impeller tidal flow transducer and PMSG with rotor in the water. The simulation consisted of PMSG, the tidal current turbine, and back-to-back converter. Also, we simulated the characteristics of output power according to the change of blade length and angular velocity.

• 신재생에너지
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• 제16권1호
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• pp.31-40
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• 2020

Most countries in the world are trying to reduce the use of fossil fuels in the production of electricity and replace them with renewable energy technologies. In Korea, there are abundant ocean renewable energy sources that will play an important role in power generation in the future. This paper introduces a new tidal energy converter utilizing flow induced vibration (FIV), which can work efficiently, even in the currents slower than 1.0m/s. All tests were conducted at the Marine Renewable Energy Laboratory at the University of Michigan to examine the effects of the damping ratio of the electric generators on the power outputs and power efficiencies. In these tests, two identical circular cylinders were used, and passive turbulence controllers were applied to the surface of the cylinders to enhance the FIV. The experimental results showed that by using the two cylinders in the FIV, the power output and efficiency reached up to 31 W and 36%, respectively. In particular, the results showed that the power efficiency was higher at the relatively low flow speed (4

• 한국유체기계학회 논문집
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• 제13권2호
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• pp.36-40
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• 2010

Tidal current power system is the energy converter which converts the kinetic energy of tidal stream into electric energy. The performance of the rotor which initially converts the energy is determined by various design factors and it should be optimized by the ocean environment of the field. Flow direction changes due to rise and fall of the tides, but horizontal axis turbine is very sensitive to direction of flow. To investigate the rotor performance considering the interaction problems with incidence angle of flow, series of experiments have been conducted. The results and findings are summarized in the paper.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.125-129
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• 2006

In order to transmit energy generated through the stator winding of a doubly-fed Induct ion generator (DFIG), we need to synchronize the generated voltage vector with the grid voltage vector. However, the existing synchronization method works only when the encoder is installed at a specific Position and equivalent constant is precise. In order to solve this Problem, a new synchronization method has been proposed and a way of applying the method to existing doubly-fed induction generator control algorithm has been also proposed. The validity of the proposed methods have been verified using a prototype converter for the control of a 1.5MW-class doubly-fed induction generator

• 한국해안·해양공학회논문집
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• 제34권1호
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• pp.1-10
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• 2022

본 연구에서는 저유속 조건에서도 발전이 가능한 수평 2열 쉬라우드 조류에너지 변환장치를 개발하였다. 쉬라우드 시스템의 형상을 결정하기 위해 3차원 수치모의 실험을 수행하였으며, 1/6 축소모형을 제작하여 수리모형 실험을 수행하였다. 수리모형 실험은 4가지 유속 조건하에서 수행하였으며, 각각의 실험 케이스별로 유속, 토크 및 RPM을 계측하였다. 수치모의 실험 결과, 노즐을 통과한 유속은 실린더에서 약 2~3배 유속이 증폭되는 것을 확인하였으며, 연장비가 2:1일 때, 가장 높은 유속 증폭율을 보였다. 또한 노즐과 실린더의 직경비는 1.5:1일 때 유속이 2.8배 증가하는 것으로 나타났다. 한편 수리모형 실험 결과, TSR이 1.75~2 일 때, 0.32~0.34의 출력 성능을 보이는 것으로 나타났다.