• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1051_1052
• /
• 2009

This paper deals with operational characteristic analysis of a single-phase PCS (Power Conditioning System) for PV (Photovoltaic) power generation system with AF (Active Filter) function. The theory of dq transformation has been applied to the control strategy of a single-phase PV power generation system to implement the AF function. Application of the virtual two-phase using phase-shift makes it possible to use the dq theory for the single-phase PV power generation system. The authors are sure that the proposed system is a very useful to compensate harmonics caused by nonlinear loads in a single-phase utility system. In this paper, not only a theoretical aspect of the single-phase PV-AF system is discussed, but also the DSP (Digital Signal Processor) based experiment results are presented to demonstrate the effectiveness of the single-phase PV-AF system.

• Proceedings of the KIEE Conference
• /
• 2008.04a
• /
• pp.234-235
• /
• 2008

본 논문은 계통연계형 태양광발전 시스템의 Power Conditioning System의 성능 테스트를 위한 태양광 시뮬레이터의 제어기 최적 설계에 관한 내용이다. 태양광 시뮬레이터 기술의 핵심은 정확한 에너지원의 모델링과 빠르고 안정적인 전력증폭기 제어기술에 있다. 종래의 제어기인 비례 적분제어기를 사용하는 과정에서 비례 적분 제어기 특유의 응답지연 특성으로 시뮬레이터의 동적 특성을 완벽하게 구현할 수 없기에, 응답속도가 빠르고 안정적인 제어기법인 $H_{\infty}$제어 이론을 적용하였다. 태양광 시뮬레이터의 제어기 성능평가를 위해서 태양광 시뮬레이터의 출력을 결정 하는 DC Power Amplifier의 성능실험을 하였다. DC Power Amplifier를 정전압에서 부하의 투입/제거시 비례-적분 제어기와 $H_{\infty}$제어기의 응답속도와 변동전압의 크기를 비교하여 제어기의 성능을 비교하였다.

• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.346-347
• /
• 2018

본 논문은 Grid, PV(Photovoltaic), BESS(Battery Energy Stroage System), DC Load로 구성된 DC 마이크로그리드를 국내 사이트에 적용한 사례 및 실증 결과에 대해 기술하고 있다. 또한 DC 마이크로그리드 시스템의 구성과 함께 Destin Power사가 개발하여 적용한 125kW급 PCS(Power Conditioning System)의 기술을 소개하였다. 마지막으로 시스템의 운영 타당성을 체계적으로 검증하기 위해 진행했던 시험 항목과 결과를 서술하였으며 그 결과를 바탕으로 DC 마이크로 그리드 시스템 실증을 검증하였다.

• 한국신재생에너지학회:학술대회논문집
• /
• 2008.10a
• /
• pp.134-137
• /
• 2008

현재 에너지 시장은 신흥 개발 도상국의 화석 에너지 사용량 급등 등의 요인으로 인해 고유가 시대가 지속될 것으로 전망되고 있다. 또한 화석 에너지 사용으로 지구 온난화가 지속되고 있으며, 이에 온실가스 배출을 규제하기 위한 유엔기후변화협약 및 환경변화 문제 해결을 위한 사회적인 합의가 이뤄지고 있다. 그러므로 다양한 신재생 에너지원의 연구 개발 및 사용이 가속화되고 있으며, 그중 기술적으로 가장 근접한 것이 태양광 발전이다. 본 논문은 당사에서 개발하는 50kW 태양광 PCS의 운전 상태를 감시하고, 필요 요소를 제어하며, 취득된 데이터를 eRTU 등의 상위 시스템에 개방된 프로토콜로 통신을 통해 올려주는 태양광 PCS HMI Unit에 대해 논하였다.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.20 no.6
• /
• pp.498-508
• /
• 2015

In the simulation of photovoltaic (PV) power conditioning systems, PSIM is a widely accepted circuit simulation platform because of its fast speed and C-code support. PSIM provides two kinds of generic PV panel models: functional model and physical model. Whereas the functional model simulates PV in the standard test condition (STC) only, the physical model can emulate changing PV characteristics under varying temperatures and irradiation conditions and is thus more suitable for system simulation. However, the physical model requires complicated parameters from users, and thus it is prone to errors and is difficult to use. In this study, a new PSIM model for PV is presented to solve these problems. The proposed model utilizes manufacturers' datasheet values specified under STC only and excludes user-defined information from input parameters. To achieve good accuracy even in varying environmental conditions, single-diode model parameters are successively tuned to a time-varying virtual datasheet. Comparison with a conventional physical model shows that the proposed model provides more accurate simulation according to error analysis based on the EN50530 standard.

• 한국태양에너지학회:학술대회논문집
• /
• 2012.03a
• /
• pp.427-432
• /
• 2012

This paper proposes efficient operation method of PV system consisted of multi-central which is suitable for large scale system. The multi-central system used switch at a DC-link and applied proposed algorithm can improve the efficiency and the reliability on the existing system. This algorithm, with advantage of Multi-Central system can minimize the effect of different characteristic of each PV array due to a shadow or damaged PV cell. Each system is analysed and maximum power point tracking control, DC-link voltage control and output current control is used commonly. The validity is verified after comparing of the existing system and proposed system by simulation.

• Proceedings of the KIPE Conference
• /
• 2001.10a
• /
• pp.668-672
• /
• 2001

The utility interactive sinewave modulated inverter for the solar photovoltaic (PV) power conversion and conditioning with a new high frequency pulse modulated link is presented for domestic residential applications. As compared with the conventional full-bridge hard switching PWM inverter with a high frequency AC link, the simplest single-ended quasi-resonant soft switching sinewave modulated inverter with a duty cycle pulse control is implemented, resulting in size and weight reduction and low-cost. This paper presents a prototype circuit of the single-ended zero voltage soft switching sinewave inverter for solar power conditioner and its operating principle. In addition, this paper proposes a control system to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed from an experimental point of view. A newly developed interactive sinewave power processor which has $92.5\%$ efficiencty at 4kW output is demonstrated. It is designed 540mm-300mm-125mm in size, and 20kg in weight.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1053_1054
• /
• 2009

A significant number of renewable energy systems have been connected to the grids as supplement power source. The renewable energy systems require control algorithm to maintain the power-supply reliability and quality. This paper proposes a novel control algorithm for smart Power Conditioning System (PCS) with harmonics and reactive power compensation. The smart PCS is used to feed Photovoltaic (PV) power to utility and compensate harmonics and reactive power at the same time. The experimentation is carried out on the proposed grid-connected PV generation system, and controlled by digital signal processor. The grid-connected PV generation system injects PV energy into the grid and performs as Active Filter (AF) and Static Synchronous Compensator (STATCOM) without additional devices. The experiment results show that the proposed control algorithm is effective for smart PCS with harmonics and reactive power compensation.

• Journal of the Korean Solar Energy Society
• /
• v.29 no.6
• /
• pp.75-80
• /
• 2009

Recently, as the grid-connected photovoltaic power conditioning systems (PVPCS) are installed in many residential areas, these have raised potential problems of network protection on electrical power system. One of the numerous problems is an Islanding phenomenon. In this paper, active frequency drift (AFD) method, one of the anti-islanding methods which is analyzed by current magnitude compensation and calculation of RMS value of the output power is proposed and verified by simulation.

• 한국태양에너지학회:학술대회논문집
• /
• 2009.11a
• /
• pp.297-302
• /
• 2009

As the grid-connected photovoltaic power conditioning systems (PVPCS) are installed in many residential areas, these have raised potential problems of network protection on electrical power system. One of the numerous problems is an Islanding phenomenon. In this paper, active frequency drift (AFD) method, one of the anti-islanding analyzed by current magnitude compensation and calculation of RMS value of the output power.