• Journal of the Korean Solar Energy Society
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• v.28 no.5
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• pp.72-77
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• 2008

The purpose of this paper is to explain the real characteristics of generation system of large scale power system of high voltage the grid connected PV power system for electricity industry. Main system is made up PCS in the class 150kVA. and we studied commercial operation in Korea-Western Power Company,(Tae-An headquarter) with the capacity of module is 122.5 $kW_p$. On the average, power plant utilities' utilization is 12.71 percent and consumption rate is 6.66 percent. We operated normally since 25th, August 2005 without any other problems.

• Journal of Power Electronics
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• v.8 no.4
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• pp.309-316
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• 2008

In this paper, new topology is proposed that can dramatically reduce the converter power rating and increase the efficiency of total PV system. Since the output voltage of PV module has very wide voltage range, in general, the DC/DC converter is used to get constant high DC voltage. According to analysis of PV characteristics, in proposed topology, only 20% power of total PV system power is needed for DC/DC converter. DC/DC converter used in proposed topology has flat efficiency curve at all load range and very high efficiency characteristics. The total system efficiency is the product of that of converter and that of inverter. In proposed topology, because the converter efficiency curve is flat all load range, the total system efficiency at the low power range is dramatically improved. The proposed topology is implemented for 200kW PCS system. This system has only three DC/DC converters with 20kW power rating each other. It is only one-third of total system power. The experiment results show that the proposed topology has good performance.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.41-44
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• 2009

본 논문에서는 태양광발전이 본격적으로 보급 활성화 되기 전인 1999년 4월에 50 kVA 계통연계형 태양광 발전시스템 개발과제로 구축된 50kWp급 중규모의 계통연계 태양광 발전시스템의 약 10년간의 장기 실증운전을 통하여 취득한 자료를 기반으로 장기운전에 따른 운전특성 변화를 분석하였다. 본 설비는 50kVA급 PCS, 3kVA급 PCS 및 모듈 50kWp의 용량으로 1999년도에 한전 전력연구원 구내에서 실증시험용으로 구축되었으며, 장기운전에 따른 출력감소율은 10년간 전년도 대비 연 2.73% 이며, 발전설비 이용율은 11.04% 로 분석되었다

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.239-240
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• 2013

The increased demand for conventional energy sources, and international oil price rises are driving societies toward research and development of renewable energy. A large number of their installations and penetrations will bring an instability distribution power system. Also, load concentration problem at specific time can cause the shortage of power reserve margin. To deal with these problems, the development of energy storage systems (ESS) is required. This paper proposes the 1MW grid-connected ESS with Li-ion battery and power conditioning system (PCS). The performances of the 1MW grid-connected ESS are evaluated and verified with the PSCAD/EMTDC based simulation test.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.519-520
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• 2006

In this paper, to evaluate the grid-connected 120kW class Photovoltaic(PV) system performance, as a consisted of solar cells, PCS, 150kVA transformer station. The paper address modeling and analysis of a grid-connected 120kW class photovoltaic generation system(PV system) PSCAD/EMTD and Psim. A PWM voltage source inverter(VIS) and its current control scheme have been implemented. A P&O(Perturbation and Observation) MPPT algorithms technique modeling has been simulated and analysed.

• Proceedings of the KIEE Conference
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• summer
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• pp.1471-1473
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• 2004

Maximum power point tracking(MPPT) is used in photovoltaic(PV) systems to maximize the photovoltaic array output power, irrespective of the temperature and irradiation conditions. The object of this paper is to compare and analyze MPPT efficiency for different MPPT techniques by changing irradiance. Also, this paper introduces transformerless grid-connected inverter. Simple flow charts and characteristics of each MPPT algorithm are shown. The implementation of transformerless grid-connected inveter system was based on a digital signal processor(DSP). Simulation was carried out for each MPPT method.

• Journal of the Korean Solar Energy Society
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• v.24 no.2
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• pp.9-15
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• 2004

3kW grid connected PV(photovoltaic) systems have been constructed for evaluating and analyzing performance of PV system at FDTC(field demonstration test center) in Korea, PV systems installed in FDTC have been operating and monitored since November 2002. As climatic and irradiation conditions have been varied through long-term field test, data acquisition system has been constructed for measuring performance of PV system to observe the overall effect of environmental conditions on their operation characteristics. The performance of PV systems has been evaluated and analyzed for component perspective(PV array and power conditioning system) and global perspective(system efficiency, capacity factor, and electrical power energy) by field test. By the results, it is very important to develop optimal design technology of grid connected PV system.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.51.1-51.1
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• 2010

본 논문에서는 wavelet 변환을 이용하여 태양광 발전 시스템의 계통 전원 고조파를 측정하는 방법을 연구하였다. PCS(Power Conditioning System)는 태양전지의 전력을 교류로 변환하여 계통에 연계시키는 장치이다. 직류에서 교류로 변환할 때 스위칭 노이즈가 발생하고, 전력품질이 약화되게 된다. Wavelet 이론은 시간 파형을 주파수 성분으로 분해할 수 있는 기술이다. 이중에서 MLD(Multi-evel Decomposition)기법은, 계산량이 적으면서도 빠른 시간 내에 고조파 성분들을 알아낼 수 있다. 시스템 모델링과 wavelet 이론 소개, 그리고 컴퓨터 모의실험과 DSP 제어기를 이용한 실험 결과로서 본 연구의 타당성을 입증하였다.

• Proceedings of the KIPE Conference
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• 2007.11a
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• pp.94-96
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• 2007

Z-소스 인버터는 기존의 전압원 인버터나 전류원 인버터가 가지고 있는 단점들을 효율적으로 극복하고 있다. 이러한 장점을 가지고 있는 Z-source 인 버터를 10kW급 계통연계형 태양광 발전 시스템용 PCS에 적용시키기 위하여 그에 필요한 제어알고리즘을 구현하고 모의 실험을 통하여 타당성을 검증한다.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.215-218
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• 2009