• 한국전자통신학회논문지
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• 제19권4호
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• pp.661-668
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• 2024

전력전자 풀파워 컨버터 기반의 직접 구동 영구자석 동기 풍력발전 그리드 연계 시스템의 토폴로지를 기반으로 풍력터빈 모델과 그리드 측 인버터 모델을 연구하고, 기계측 정류기 제어 기반의 전류 및 속도 이중 폐쇄 루프 전략과 전류 및 전압 이중 폐쇄 루프를 기반으로 한 그리드 측 인버터 제어 전략을 설계하여 2레벨 연속 이중 폐쇄 루프 완전 제어 전략을 구현했다. MATLAB/Simulink를 이용하여 시스템 시뮬레이션 모델을 구축하였고, 풍속이 단계별로 변할 때의 장치의 동작을 시뮬레이션하였으며, 그리드 전압의 동일한 위상과 양호한 정현파 특성을 갖는 그리드 연결 전류를 출력하였다. 연결된 시스템이 안정적이고 효율적으로 실행되었다. 시뮬레이션 결과 모델의 타당성과 합리성, 제어 전략의 정확성과 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 전력전자학술대회 논문집
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• pp.215-216
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• 2014

This paper proposes a control algorithm for permanent magnet synchronous generator with a back-to-back three-level neutral-point clamped voltage source converter in a medium-voltage offshore wind power system under unbalanced grid conditions. The proposed control algorithm particularly compensates for the unbalanced grid voltage at the point of common coupling in a collector bus of offshore wind power system. This control algorithm has been formulated based on the symmetrical components in positive and negative rotating synchronous reference frames under generalized unbalanced operating conditions. Instantaneous active and reactive power are described in terms of symmetrical components of measured grid input voltages and currents. Negative sequential component of ac input current is injected to the point of common coupling in the proposed control strategy. The amplitude of negative sequential component is calculated to minimize the negative sequential component of grid voltage under the limitation of current capability in a voltage source converter. The proposed control algorithm makes it possible to provide a balanced voltage at the point of common coupling resulting in the generated power of high quality from offshore wind power system under unbalanced network conditions.

• Journal of Power Electronics
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• 제13권2호
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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.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.257-258
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• 2011

풍력 발전 시스템은 경제성이 비교적 높은 신재생 에너시 시스템으로 전세계적으로 대규모 단지를 조성하여 전력계통과 연계하여 운용되고 있다. 풍력 발전 단지의 계통에 대한 영향력이 커짐에 따라 독일, 덴마크, 캐나다 등 세계 각국의 계통 연계 기준이 강화되어, 기존과 달리 계통에 협조적인 풍력 발전 시스템이 요구되고 있다. 본 논문에서는 국가별 계통 연계 기준을 만족할 수 있는 간단한 LVRT 제어 전략을 제시하며, 10kW급 계통 연계 인버터와 계통 사고 모의 장치를 통하여 다양한 계통 사고 상황에 대한 제어 전략의 타당성을 검증하였다.

• Journal of Power Electronics
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• 제15권4호
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• pp.939-950
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• 2015

A single-stage AC-AC converter has been designed for a wind energy conversion system (WECS) that eliminates multistage operation and DC-link filter elements, thus resolving size, weight, and reliability issues. A simple switching strategy is used to control the switches that changes the variable-frequency AC output of an electrical generator to a constant-frequency supply to feed into a distributed electrical load/grid. In addition, a modified random sinusoidal pulse width modulation (RSPWM) technique has been developed for the designed converter to make the overall system more efficient by increasing generating power capacity and reducing the effects of inter-harmonics and sub-harmonics generated in the WECS. The technique uses carrier and reference waves of variable switching frequency to calculate the firing angles of the switches of the converter so that the three-phase output voltage of the converter is very close to a sine wave with reduced THD. A comparison of the performance of the proposed RSPWM technique with the conventional SPWM demonstrated that the power generated by a turbine in the proposed approximately increased by 5% to 10% and THD reduces by 40% both in voltage and current with respect to conventional SPWM.

• 전기학회논문지
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• 제62권10호
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• pp.1481-1486
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• 2013

The small wind generator with existing mechanical control system has a frequent failure and malfunction, and its maintenance is difficult. In this paper, an electric control method using a boost converter for small wind generator was suggested. The suggested 2-level boost converter control device was manufactured and its experimental operation were conducted on a wind generator with 200 [W] capacity. As a result of experimental device, the control by a boost converter was executed at the point that the output voltage of a wind generator became 36 [V] so it could be identified that the output voltage of a wind generator diminished and then it became 0 [V] after 5 [sec]. Besides, in case of applying the method suggested in this paper to a small wind power generation facility for street lights, it is expected to reduce its maintenance by preventing a frequent failure of a generator and to improve its utilization rate.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.292-294
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• 2008

최근 환경 파괴와 에너지 고갈에 대한 문제들이 사회의 큰 문제로 대두 되면서 풍력발전의 중요성이 증가하고 있다. 본 논문에서는 LabVIEW를 이용하여 이더넷(Ethernet) 환경에서의 풍력발전 원격감시 제어시스템을 구현하였다. 제안된 원격감시 제어시스템은 풍력발전 시스템의 MCU와 W5100의 SPI(Serial Peripheral Interface)를 통한 이더넷 통신용 하드웨어를 구축하였으며, NI사의 LabVIEW를 이용하여 서버상의 HMI(Human Machine Interface) 소프트웨어를 구현하였다. 본 연구의 실험을 위해 영구자석형 동기 발전기(PMSG:Permanent Magnet Synchronous Generator)를 이용하여 풍력발전 시스템 모델을 구현하고 이를 이용하여 원격감시 제어시스템의 성능을 검증하였다.