• Journal of Power Electronics
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• 제17권1호
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• pp.232-241
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• 2017

Advanced control algorithms must be used to make wind power generation truly cost effective and reliable. In this study, we develop a new and simple control scheme that employs model predictive control (MPC), which is used in permanent magnet synchronous generators and grid-connected inverters. The proposed control law is based on two points, namely, MPC-based torque-current control loop is used for the generator-side converter to reach the maximum power point of the wind turbine, and MPC-based direct power control loop is used for the grid-side converter to satisfy the grid code and help improve system stability. Moreover, a simple prediction scheme is developed for the direct-drive wind energy conversion system (WECS) to reduce the computation burden for real-time applications. A small-scale WECS laboratory prototype is built and evaluated to verify the validity of the developed control methods. Acceptable results are obtained from the real-time implementation of the proposed MPC methods for WECS.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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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.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.286-289
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• 2006

To get the better efficiency in Korean type wind characteristics, a new wind turbine blade was developed with some structural, vibrational, and aero-elastic analysis for the design of the full-scale blade. A series of full domestic technology from design to manufacturing was created and used in the middle of the development of nelv wind blade. And it was equipped and measured at the wind test side in the Jeju island. After test, it is verified that the blade has the regular capacity of 10kW at the air velocity of 10m/s. And it shows better capacity in the low air-velocity compared to the imported blade. therefore it can be made by only domestic technology, and used for the domestic wind distribution with the better power generation.

• 전력전자학회논문지
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• 제14권1호
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• pp.15-22
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• 2009

본 논문은 소형 풍력발전용 영구자석형 동기발전기에서 고정자 자속과 역기전력을 이용한 센서리스 제어방법을 제안한다. 기존의 다이오드와 DC-부스트 컨버터를 사용한 소형 풍력발전용 컨버터와는 달리 2-Leg 3상 PWM 컨버터를 사용하여 발전기를 구동한다. 이는 기존의 컨버터와 비교하여 가격적으로 뒤지지 않으며, 발전기의 벡터제어가 가능하여 최대출력 제어시 발전 효율향상을 확인할 수 있다. 그리고 센서리스 제어 알고리즘을 적용하여 속도 측정을 위해 사용되는 엔코더를 제거하므로 시스템의 가격을 저감시킨다. 제안된 알고리즘은 PSIM 시뮬레이션을 사용하여 컨버터 제어 성능과 발전기의 최대 출력 제어의 타당성을 검증한다.

• Journal of Power Electronics
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• 제17권6호
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• pp.1587-1599
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• 2017

This paper proposes a real-time implementation of an optimal operation of a double stage grid connected wind power system incorporating an active power filter (APF). The system is used to supply the nonlinear loads with harmonics and reactive power compensation. On the generator side, a new adaptive neuro fuzzy inference system (ANFIS) based maximum power point tracking (MPPT) control is proposed to track the maximum wind power point regardless of wind speed fluctuations. Whereas on the grid side, a modified predictive current control (PCC) algorithm is used to control the APF, and allow to ensure both compensating harmonic currents and injecting the generated power into the grid. Also a type 2 fuzzy logic controller is used to control the DC-link capacitor in order to improve the dynamic response of the APF, and to ensure a well-smoothed DC-Link capacitor voltage. The gained benefits from these proposed control algorithms are the main contribution in this work. The proposed control scheme is implemented on a small-scale wind energy conversion system (WECS) controlled by a dSPACE 1104 card. Experimental results show that the proposed T2FLC maintains the DC-Link capacitor voltage within the limit for injecting the power into the grid. In addition, the PCC of the APF guarantees a flexible settlement of real power exchanges from the WECS to the grid with a high power factor operation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.949-951
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• 2002

Permanent-magnet (PM) synchronous generator is feasible for use with a wind turbine, because the generator for wind power requires variable-speed generation, light weight, and high torque. In this paper, basic design and construction of an axial-flux permanentmagnet generator with power output at 60 [Hz], 300 [r/min] for wind energy system is introduced. Finite-element method (FEM) is applied to analyze generator performance. In order to save time, equivalent analysis model is developed. The performance of the proposed generator at no-load and resistive load are compared, and power output and voltage at various speed and loads are compared as well. The results of FE analysis show that this PM generator is a useful solution for small-scale wind-turbine applications.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.1112-1118
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• 2014

In island and backcountry areas, electrical power is usually supplied by diesel generators. It is difficult for small scale diesel generators to have an economy of scale owing to the usage of fossil fuels to produce electricity. Also, there is a problem of carbon dioxide emissions that brings some environmental pollution to the entire region of the area. For solving those, this paper proposes a design method of autonomous micro-grid to minimize the fossil fuels of diesel generator, which is composed of diesel generator, wind turbine, battery energy storage system and photovoltaic generation system. The proposed method was verified through computer simulation and micro-grid operation system.

• Journal of Power Electronics
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• 제5권4호
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• pp.289-304
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• 2005

This paper describes a simple control structure and power conditioning system for an indirect vector controlled stand-alone induction generator (IG) used to operate under variable speed. The required reactive power for the IG system is supplied by means of a capacitor bank and a voltage-source PWM converter. Using a capacitor bank to transfer the reactive power to the IG under the rated speed and no-load conditions starts the IG operation and reduces the PWM converter size. The vector control structure for the variable speed IG power conditioning system compensates for changes in the electrical three-phase and DC loads while considering the magnetizing curve of the IG. The vector control structure is developed to regulate the DC link voltage of the PWM converter and the IG output voltage. The experimental and simulated performance results of the IG power conditioning system at various speeds and loads are given and show that this proposed scheme can be used efficiently for a variable speed, wind energy conversion system.

• 에너지공학
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• 제21권3호
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• pp.281-291
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• 2012

최근 세계경기가 회복되고 미국 및 중국 등 주요 국가들의 신성장동력산업 육성정책이 강화됨에 따라 신재생에너지의 글로벌 경쟁이 더욱 치열한 양상으로 전개되고 있다. 신재생에너지 개발의 일환으로 주요 선진국 및 우리나라도 풍력발전에 많은 자금을 투입하여 개발 및 풍력발전소 건설을 추진하고 있다. 세계 풍력발전 시장은 약 700억 달러 규모로 더욱 증가할 것으로 예상되며, 이에 우리나라도 풍력발전의 국내 설치뿐만 아니라 해외진출도 적극 고려하고 있다. 이러한 배경 하에서 본 연구는 산업연관분석을 이용하여 풍력발전의 해외수출이 국내 경제에 미치는 파급효과를 분석하고자 한다. 특히 경제적 파급효과로 생산유발효과, 부가가치 유발효과, 취업유발효과의 3가지를 분석하되, 수요유도형 모형을 적용한 분석 결과를 제시한다. 한국은행 산업연관표 통합소분류 기준 168부문 중에서 11개 부문을 풍력발전 관련 부문이라 정의한 후, 풍력발전 관련산업을 중심에 놓고 이를 외생화하여 분석한다. 1,000억원 규모의 풍력발전을 해외로 수출하였을 경우, 생산유발효과, 부가가치 유발효과, 취업유발효과는 각각 2,050억원, 678억원, 1,054명으로 분석되었다.

• 한국가시화정보학회지
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• 제10권1호
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• pp.27-33
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• 2012

This paper describes a new design of small-scale horizontal wind blade, called spiral wind turbine blade. Theoretical and numerical approaches on the prediction of aerodynamic performance of the blade have been conducted. A theoretical equation is successfully derived using the angular momentum equation to predict aerodynamic characteristics according to the design shape parameters of spiral blade. To be compared with the theoretical value, a numerical simulation using ANSYS CFX v12.1 is performed on the same design with the theoretical one. Large scale tip vortex is captured and graphically presented in this paper. The TSR-$C_p$ diagram shows a typical parabolic relation in which the maximum efficiency of the blade approximately 25% exists at TSR=2.5. The numerical simulation agrees well with that of the theoretical result except at the low rotational speed region of 0~20 rad/s.