• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2012년도 전력전자학술대회 논문집
• /
• pp.313-314
• /
• 2012

In this paper presents study of T-Type multi level inverter for utility interactive photo voltaic inverter. In order to increase efficiency and performance of utility interactive photo voltaic (UIPV) system, we propose multi level PCS topology, such as T-type inverter. The control algorithm for utility interactive inverter is implemented by simulation and experimentation, which includes dc-bus and midpoint voltage controller, ac-grid current controller and PLL algorithm.

• 전기학회논문지
• /
• 제58권11호
• /
• pp.2175-2184
• /
• 2009

This paper describes operational analysis results of the DC micro-grid using detailed model of distributed generation. Detailed model of wind power generation, photo-voltaic generation, fuel-cell generation was implemented with the user-defined model of PSCAD/EMTDC software that is coded with C-language. The operation analysis was carried out using PSCAD/EMTDC software, in which the power circuit is implemented by built-in model and the controller is modelled by user-defined model that is also coded with C-language. Various simulation results confirm that the DC micro-grid can operate without any problem in both the interconnected mode and the islanded mode. The operation analysis result confirms that the DC micro-grid make it feasible to provide power to the load stably. And it can be utilize to develop the actual system design and building.

• Journal of Power Electronics
• /
• 제10권1호
• /
• pp.79-84
• /
• 2010

This paper presents a grid connected photo-voltaic system using a quasi-Z-source inverter (QZSI) for power stage reduction. The power stage can be reduced because of an additional shoot-through stage which is a characteristic of QZSI. Therefore, by utilizing a QZSI the system's efficiency can be increased. In this paper, for applying a QZSI to a PV system, control methods such as maximum power point tracking (MPPT), point of common coupling (PCC) current control and PWM are studied and verified through simulation and experiment. In order to explain the above controllers, the characteristics of a QZSI are first analyzed. Then the MPPT control technique with a modified P&O method, the PCC current control for the regulation of the dc-link capacitor voltage and the PWM methods for the proposed system are explained. The feasibility of the proposed algorithm is verified through simulation and experiment with a 3kW system.

• 해양환경안전학회지
• /
• 제17권2호
• /
• pp.161-166
• /
• 2011

본 연구에서는 태양전지로 구동되는 전기추진 소형선박을 제안하여 선체의 설계 및 모형선 시험을 행하였다. 선체 모양은 배의 안정성 및 태양과의 수광면적을 고려하여 차타마란형으로 제작하였다. 계산에 의하면 설계 선박의 선속을 5 knots로 할 때 1.1마력으로 충분한 추력이 산출되었으나 실제의 선속은 태양에너지 등 기후조건에 의해 산출된 값보다 약간 낮았다.

• 전기학회논문지
• /
• 제64권3호
• /
• pp.393-398
• /
• 2015

City or Community-scale Energy Management System(CEMS) is used to reduce the total energy consumed in the city by arranging the energy resources efficiently at the planning stage and controlling them economically at the operating stage. Of the operational functions of the CEMS, generation forecasting of renewable energy resources is an essential feature for the effective supply scheduling. This is because it can develop daily operating schedules of controllable generators in the city (e.g. diesel turbine, micro-gas turbine, ESS, CHP and so on) in order to minimize the inflow of the external power supply system, considering the amount of power generated by the uncontrollable renewable energy resources. This paper is written to introduce numerical models for photo-voltaic power generation prediction based on the weather forecasting information. Unlike the conventional methods using the average radiation or average utilization rate, the proposed models are developed for CEMS applications using the realtime weather forecast information provided by the National Weather Service.

• 전기학회논문지
• /
• 제65권7호
• /
• pp.1176-1185
• /
• 2016

This paper proposes a new output voltage control scheme based on the SoC variation of the battery energy storage system (BESS) applicable for the stand-alone DC microgrid. The proposed control scheme provides relatively lower variation of the DC grid voltage than the conventional droop method. The performance of proposed control scheme was verified through computer simulations for a typical stand-alone DC microgrid which consists of BESS, photo-voltaic (PV) panel, engine generator (EG), and DC load. A scaled hardware prototype for the stand-alone DC microgrid with DSP controller was set up in the lab, and the proposed control algorithm was installed in the DSP controller. The test results were compared with the simulation results for performance verification and actual system implementation.

• Journal of Power Electronics
• /
• 제11권3호
• /
• pp.350-359
• /
• 2011

This paper describes the operational analysis results of a DC micro-grid using a detailed model of distributed generation. A detailed model of wind power generation, photo-voltaic generation and fuel cell generation was implemented with an userdefined model created with PSCAD/EMTDC software and coded in C-language. The operational analysis was carried out using PSCAD/EMTDC software, in which the power circuit is implemented by a built-in model and the controller is modeled by an user-defined model that is also coded in C-language. Various simulation results confirm that a DC micro-grid can operate without any problems in both the grid-tied mode and in the islanded mode. The operational analysis results confirm that the DC micro-grid makes it feasible to provide power to the load stably. It can also be utilized to develop an actual system design.

• 한국가시화정보학회지
• /
• 제19권1호
• /
• pp.18-27
• /
• 2021

As the photo-voltaic (PV) industry grows, the floating PV has been suggested to resolve current environmental destruction and a lack of installation area. Currently, various floating PV systems have been developed, but there is a lack of studies on how the shape of the floating body and other compositions are affecting structural behavior. In this study, the behavior of the floating PV was investigated at the various length of mooring lines, stiffness of connecting hinges, and size of floating bodies. The shortest mooring lines with the distributed type floating PV showed the least force on the floating body and corresponding motion. A frictionless hinge is safer at the regular and low-height wave, while a stiff hinge is safer at irregular and high-height wave. In addition, due to the bi-axial distribution of the connecting hinge, 45° direction wave was found to be the most dangerous.

• Korean Chemical Engineering Research
• /
• 제58권3호
• /
• pp.416-423
• /
• 2020

대부분의 태양광 발전시설물은 평지에 설치가 되는 것이 일반적이지만 소형 발전시설의 경우는 경사진 임야 등에 설치되는 경우도 많다. 그 외에는 드물게 건물의 옥상이나 콘크리트 위에 설치되는 경우가 있으나 이는 대부분 25 kW 미만의 소규모 설치이다. 일반 평지나 임야 등에 설치가 될 경우 관리를 지속적으로 하지 않으면 잡초가 자라고 일정 높이 이상 자라게 된 잡초는 태양광 모듈에 그림자의 영향을 줄 수 있게 된다. 그러나 잡초가 조금 자란 것이 영향을 주는지 주지 않는지 판단하기 힘들고 지속적인 관리를 위해서는 관리 비용이 발생하기 때문에 잡초가 태양광 발전에 영향을 주는 시점에서 정확하게 관리를 해준다면 가장 최소한의 관리비용으로 최대한의 태양광 발전량을 가져 올 수 있을 것으로 판단된다. 본 연구에서는 잡초가 의한 태양광 모듈의 발전에 영향을 미치는 형태를 모니터링을 통한 발전량 데이터를 분석하여 그 유형을 파악을 하고 모듈에서 잡초의 그림자 영향이 출력의 감소에 어떠한 영향을 주는지 실험을 통해 분석하였다. 이를 바탕으로 잡초의 영향을 모니터링 데이터 상의 수치로 기준을 정하였다. 또한 잡초의 영향을 장기적으로 방치를 하였을 경우 나타나게 되는 현상인 핫스팟(Hot spot) 발생의 기준을 수치적으로 표준화 하였다.

• 조명전기설비학회논문지
• /
• 제27권5호
• /
• pp.67-73
• /
• 2013

The conversion of solar radiation into electrical energy by Photo-Voltaic (PV) effect is a very promising technology, being clean, silent and reliable, with very small maintenance costs and small ecological impact. The output power produced by the PV panels depends strongly on the incident light radiation. The continuous modification of the sun-earth relative position determines a continuously changing of incident radiation on a fixed PV panel. The point of maximum received energy is reached when the direction of solar radiation is perpendicular on the panel surface. Thus an increase of the output energy of a given PV panel can be obtained by mounting the panel on a solar tracking device that follows the sun trajectory. Tracking systems that have two axes and follow the sun closely at all times during the day are currently the most popular. This paper presents research conducted into the performance of Solar tracking system with photosensors. The results show that an optimized dual-axis tracking system with photosensor performance and analysis. From the obtained results, it is seen that the sun tracking system improves the energy and energy efficiency of the PV panel.ti-junction CPV module promises to accelerate growth in photovoltaic power generation.