• Proceedings of the KIEE Conference
• /
• 2005.07a
• /
• pp.498-500
• /
• 2005

Photovoltaic System is clearness source of energy that don't flow out environmental pollution. For effective management of photo- voltaic systems, PVCMS (Photovoltaic Central Monitoring System) is operated in 24 site throughout the country. This paper verifies reliability of the data of CMS by measuring voltage, current, power of PV system and presents coefficient of output. Also, calculated efficiency of PV system is compared with real efficiency.

• Advances in Energy Research
• /
• v.4 no.1
• /
• pp.47-68
• /
• 2016

A well designed hybrid power system (HPS) can deliver electrical energy in a cost effective way. In this paper, model for HPS consisting of photo voltaic (PV) module and wind mill as renewable energy sources (RES) and solar lead acid battery as storage device connected to unidirectional grid is developed for peak demand reduction. Life time energy cost of the system is evaluated. One year hourly site condition and load pattern are taken into account for analysing the HPS. The optimal HPS is determined for least life time energy cost subject to the constraints like state of charge of the battery bank, dump load, renewable energy (RE) generation etc. Optimal solutions are also found out individually for PV module and wind mill. These three systems are compared to find out the most feasible combination. The results show that the HPS can deliver energy in an acceptable cost with reduced peak consumption from the grid. The proposed optimization algorithm is suitable for determining optimal HPS for desired location and load with least energy cost.

• Progress in Superconductivity and Cryogenics
• /
• v.17 no.3
• /
• pp.18-22
• /
• 2015

This paper deals with high-Tc superconducting (HTS) power charging system with GdBCO magnet, photo-voltaic (PV) controller, and solar panels to charge solar energy. When combining the HTS magnet and the solar energy charging system, additional power source is not required therefore it is possible to obtain high power efficiency. Since there is no resistance in superconducting magnet carrying DC transport current the energy losses caused by joule heating can be reduced. In this paper, the charging characteristics of HTS power charging system was simulated by using PSIM. The charging current of HTS superconducting power charging system is measured and compared with the simulation results. Using the simulation of HTS power charging system, it can be applied to the solar energy applications.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.29 no.9
• /
• pp.56-62
• /
• 2000

1997년 12월 일본 교토에서 개최된 COP3를 계기로 1999년 3월 에너지보존법이 대폭적으로 개정 및 강화되어졌다. 지구온난화의 주된 원인이 되는 이산화탄소는 에너지와 밀접한 관계를 가지고 있으므로, 에너지보존·자원보존의 추진은 지구온난화 대책의 추진과 동등한 의미를 가지고 있다고 하여도 과언이 아니다. 여기서는 건축설비계획의 관점에서 에너지보존법 개정의 요점과 그 대응책에 관해서 개요를 소개하였다.

• Proceedings of the KIEE Conference
• /
• 2008.10c
• /
• pp.185-187
• /
• 2008

This paper proposed design and development of a photo voltaic (PV) array fed induction motor drive. A drive system using a chopper circuit to track maximum power from the PV for different solar insolation and a current controlled voltage source inverter (CC-VSI) to optimally match the motor to PV characteristics is presented. The model equations governing interaction of torque and flux producing components of motor current with available solar power is developed for the operation of the system at optimum efficiency. Performance of the system is presented for different realistic operating conditions, which demonstrates its special features for applications such as solar water pumping system, solar vehicles and floor mills located in hilly and isolated areas.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.539-540
• /
• 2012

지구 온난화를 대비하여 PV(Photovoltaic)를 활용하여 생산된 전기를 산업현장이나 기타 다양한 분야에 활용되고 있다. 이러한 PV 시스템은 PV 어레이를 통하여 생산된 직류 전기를 인버터(inverter) 통하여 교류 전기로 전환하여 활용하고 있다. 더욱 현재에는 PV의 가격 하락으로 그 활용도가 높아 졌고 CO2 절감을 위해 정부차원에서 적극 장려하고 있다. 본 논문에서는 이러한 PV 기반의 발전 시스템을 모니터링하기 위하여 블루투스 모듈을 이용하여 데이터 브릿지를 설계하였다. 설계된 브릿지 모듈을 통하여 태양광 인버터에 대한 정보를 모니터링 할 수 있도록 하였으며, 주변 환경에 대한 환경 정보를 안드로이드 기반의 스마트폰에서 모니터링 하도록 하였다. 이러한 스마트폰 기반으로 스마트 그리드(smart grid) 시스템을 모니터링 할 수 있는 스마트한 모니터링 시스템을 제시하고자 한다.

• Proceedings of the KIPE Conference
• /
• 2003.07b
• /
• pp.511-515
• /
• 2003

This paper presents a novel prototype of the utility-interfaced sinusoidal pulse width modulated (SPWM) inverter using the high-frequency flyback transformer fur the small-scale solar photo-voltaic power conditioner (1kW - 4kW). The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital fur solar photovoltaic power conditioner systems with the viewpoint of safety and convenience. The discontinuous conduction mode (DCM) operation of the flyback transformer is also maintained to simplify the topology of the inverter circuit and control scheme. First, the operating principle of the proposed circuit is described far the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented. The proposed circuit is verified by the computer simulation and the prototype experiment.

• Proceedings of the KIPE Conference
• /
• 2010.07a
• /
• pp.565-567
• /
• 2010

This paper proposes a new Maximum Power Point Tracking (MPPT) control algorithm for PV-Cell (Photo voltaic) based on Incremental Conductance MPPT algorithm. The ICN (Incremental Conductance method) algorithm is widely used due to the high tracking accuracy and adaptability to the rapidly changing isolation condition. In this paper, a modified ICN MPPT algorithm is proposed. This method adjusts automatically the step-size of reference to track the PV-Cell maximum power point, thus it improves the maximum power point tracking speed and accuracy.

• Proceedings of the KIEE Conference
• /
• 2002.11b
• /
• pp.280-282
• /
• 2002

As EG(Embedded Generation : photo-voltaic, wind, combined heat and power, fuel cell, small hydro etc.) grows fast in adopting to peak load reducing at the middle or the end of distribution system, there much has been interested in interconnection of EG. This paper discusses the various issue of a embedded generator to power system and shows the simulation of its various situation that could happen (focusing on load-flow by EG) by using a commercial software CYME(PSAF) for load-flow. With a result of above simulation, this paper shows a way of possible solution briefly.

• 한국태양에너지학회:학술대회논문집
• /
• 2011.04a
• /
• pp.15-16
• /
• 2011

In this paper, I suggested the energy flexibility for photovoltaic energy. The cost for PV is surely high. But renewable energy is an one of the key solution for next energy resource. The latest technology needs more electricity. So many people are carrying more mobile charge in their batteries. Looking at the poor country people and nation, it is necessary to supply and share the advanced energy resources like photo voltaic. So in this open seminary I want to share the idea for this theme. The detail discussion will be shown in the following paper.