• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.147-150
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• 2004

Maximum power point tracking for PV systems traditionally uses either perturbation and observation method or incremental conductance method. Both methods require modulation of the output voltage and this leads to significant power loss. In this paper, a method, which senses output circuit voltage and short circuit current and use the above two parameters for optimum control with a fuzzy controller, is introduced. The short circuit current of PV cell represents illumination, and the output circuit voltage carry on information about the temperature. PCS(power conditioning system) is controlled not only feed to inverter for stability voltage variation despite of variety external environment, but also operate in order to feeding voltage and current at maximum power point by boost type chopper.

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

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.508-509
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• 2011

신재생 에너지원인 풍력과 태양광등 대체에너지의 확대보급과 풍력발전과 에너지 저장장치와 같은 신재생 에너지원 및 스마트그리드 분야에 적용을 위한 대용량 PCS(Power Conditioning System) 개발에 대해 설명한다. 실외 설치환경 및 장소에 따른 많은 제작, 운영조건에서 벗어 나고자 냉각방식을 수냉형으로 설계하였다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1075-1076
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• 2008

이 논문에서는 전류형 MPPT(Maximum Power Point Tracking) 기법을 제안하고 적용하여 태양광 PCS(Power Conditioning System)의 기본적인 제어기를 설계하고 구현하였다. 기본적인 무변압기형 토폴로지에 전류 MPPT를 수행하고 이때에 얻어진 기준전류를 dc/dc 부스트 컨버터를 통해 dc-link에 전압을 충전하여 준다. 이 충전된 파워는 인버터를 통해 계통에 공급되게 된다. 이처럼 크게 MPPT제어, dc/dc컨트롤러, dc-link전류제어, 인버터 전류제어로 나뉘며 본 논문에서는 각 부분의 제어기를 살펴보고 실험을 통해 제어기의 성능을 확인하였다. 실험결과 제안된 전류 MPPT는 원활히 파워를 공급해주었고 dc/dc 부스터 컨버터를 거처 인버터 단까지 파워를 안정적으로 발전하는 것을 확인하였다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.217-218
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• 2014

전력 계통에 연계하는 신재생에너지 분산형 전원의 보급량이 지속적으로 늘어나면서 저압 계통의 공통 연계점에 다수대의 PCS(Power Conditioning System)가 집중적으로 설치되는 사례가 증가하고 있다. 최근 일본전기공업회(JEMA)는 계통 사고나 계획 정전 등으로 변전소 차단기가 개방되었을 때, 복수대 PCS의 능동방식이 서로 간섭을 일으켜 정해진 시간 내에 단독운전 검출기능이 작동하지 않게 되는 상황을 방지하기 위해 표준형 단독운전 능동적 방식을 공표하였다. 본 논문에서는 일본 단독운전 검출방식의 표준으로 지정된 스텝주입이 있는 주파수피드백 방식의 원리와 특징을 살펴보고, 이를 적용하여 연계 보호기능의 안전성 확보와 분산형 전원 보급에 기여하는 효과에 대해 소개하였다.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.55-57
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• 2005

This paper presents the development and performance of a power conditioning system (PCS) for application to a 100kw Molten Carbonate Fuel Cell. (MCFC) generation system. The MCFC generation system is a part of a four year government funded research project that began in 2001. This paper presents the results of operation connected to an actual fuel cell stack at a field demonstration site. and this paper shows various tests and performance verification of the 100kW PCS using a simulated DC source.

• Journal of the Korean Society of Safety
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• v.34 no.1
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• pp.21-26
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• 2019

This paper is purposed to develop hardware for controlling abnormal temperature that can occur environment and component itself in PCS. In order to be purpose, the hardware which is four part(sensing, PLC, monitoring and output) keep detecting temperature for critical components of PCS and can control the abnormal temperature. Apply to the hardware, it is selected to PV power generation facilities of 20 kW in Cheong-ju city and measured the data for one year in 2017. Through the temperature data, it is found critical components of four(discharge resistance, DC capacitor, IGBT, DSP board) and entered the setting value for operating the fan. The setting values for operating the fan are up to $130^{\circ}C$ in discharge resistance, $60^{\circ}C$ in DC capacitor, $55^{\circ}C$ in IGBT and DSP board. The hardware is installed at the same PCS(20 kW in Cheong-ju city) in 2018 and the power generation output is analyzed for the five days with the highest atmospheric temperature(Clear day) in July and August in 2017 and 2018 years. Therefore, the power generation output of the PV system with hardware increased up to 4 kWh.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.299-301
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• 2009

In this paper, a novel anti-islanding method of DC-AC single phase inverter is proposed. The inverter injects a little harmonic current with the output current of a PCS(Power Conditioning System). When the islanding condition is occurred, the voltage harmonic components appear on the output voltage of the PCS due to the injection of a little harmonic current. So, the PCS detects the voltage harmonic components using the Goertzel algorithm, and then the PCS decides that the islanding condition is occurred. When the PCS recognizes the islanding condition, the PCS are stopped. The proposed a novel anti-islanding method is analyzed, and its validity is proven through simulation.

• 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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.8
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• pp.423-429
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• 2006

Recently, the high frequency isolated boost DC/DC converter has been widely used for the PCS (Power Conditioning System) system because of its small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have the problems such as the high conduction losses and the surge voltage due to the high circulating current and the leakage inductance, respectively. To overcome this problems, in this paper the secondary LLC resonant converter is proposed, and the experimental results of the secondary LLC series resonant converter for boost DC/DC converter are verified on the simulation based on the theoretical analysis and the 700W experimental prototype.