• Title/Summary/Keyword: Solar Charger

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Hybrid Charger Development for Wind and Photovoltaic Power Generation (풍력 및 태양광 겸용 충전장치 개발)

  • Jong, K.S.;Park, S.J.;Kang, F.S.;Ahn, J.W.;Lee, S.H.;Lee, M.H.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.666-668
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    • 2005
  • Recently the study on the new and renewable energy is being addressed and the application examples about it are also increasing as greatly as possible. In this paper, the battery charge controller of street lamp power using wind and solar energy is made and tested.

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PV MPPT with Battery Charger & Inductive Load Using Single Current Sensor (단일전류센서를 이용한 태양광 최대전력추종 및 배터리 충전과 모터 제어기법)

  • Kim, Seung-Min;Choy, Ick;Choi, Ju-Yeop;Lee, Sang-Cheol;Lee, Dong-Ha
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.417-418
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    • 2013
  • 태양광 발전설비에서 태양광 셀의 출력전력을 최대로 부하에 전달하기 위해 태양광 최대전력추종제어를 한다. 일반적인 태양광 최대전력 추종제어는 태양광 셀의 전압과 전류의 곱인 전력값을 비교하여 최대전력추종제어를 한다. 본 논문에서는 MPPT 컨버터의 출력 파라미터 중 전류만을 센싱하여 태양광 최대전력추종제어를 한다. 또한 태양광 최대 전력추종제어를 통해 최대 출력으로 배터리를 충전하고 허용전류를 초과했을 때에는 전류제어로 충전하도록 설계한다. 이를 통해 Solar Car등과 같은 모터 부하에 적용해 보고자 한다.

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Eco-friendly Smart Outdoor Jacket Production and Usability Evaluation (환경 친화적 스마트 아웃도어 재킷제작 및 사용성 평가)

  • Lee, Jeong Ran
    • Journal of the Korean Society of Clothing and Textiles
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    • v.38 no.6
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    • pp.845-856
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    • 2014
  • This study focused on the production and usability evaluation of smart outdoor jackets that are designed to provide convenience to middle-aged people by embedding devices for lighting and location tracing. The results were as follows. 1. Jacket power supplier was a assembled system composed of battery, charger, controller and switch. A solar cell was attached on the upper arm, and a wire type EL on the center line of a raglan sleeve along with a GPS on the left sleeve with a transparent vinyl pocket. The total weight of the jacket embedded with devices was 385-520g. 2. Operation of function, activity, acceptability, safety, convenience for device use, appearance, practical maintenance were selected based on an analysis of evaluation criteria of previous smart wear research. Criteria were narrowed to three major categories of satisfaction, appearance and maintenance. 3. Use satisfaction criterion consisted of wearable device functionality and physical, psychological use convenience. The evaluation indicated actual functionality. EL functions were especially effective and necessary. Convenience of use showed that a smart jacket was thought to be safe and the size was moderate regardless of age and gender. Outer appearance was satisfactory and respondents praised the color. The practical maintenance evaluation indicated that there was no challenge in doing the laundry since the solar battery and GPS were detachable. The practical use of smart outdoor jackets confirmed by fabric that was washable and dried quickly.

An Economic Evaluation under Thailand Feed in Tariff of Residential Roof Top Photovoltaic Grid Connected System with Energy Storage for Voltage Stability Improving

  • Treephak, Kasem;Saelao, Jerawan;Patcharaprakiti, Nopporn
    • International Journal of Advanced Culture Technology
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    • v.3 no.1
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    • pp.120-128
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    • 2015
  • In this paper, Residential roof top photovoltaic system with 9.9 kW design is proposed. The system composed of 200 Watts solar array 33 panels connecting in series 10 strings and parallels 3 strings which have maximum voltage and current are 350 V and 23.8 A. The 10 kW sinusoidal grid-connected inverter with window voltage about 270-350 is selected to convert and transfer DC Power to AC Power at PCC (Point of Common Coupling) of power system following to utility standard. However the impact of fluctuation and uncertainty of weather condition of PV may decrease the voltage stability and voltage collapse of power system. In order to solve this problem the energy storage such 120 V 1200 Ah battery bank and 30 kVAR capacitor are designed for voltage stability control. The other expensed for installing the system such battery charger, cable, accessories and maintenance cost are concerned. The economic analysis by using investment from money loan with interest about 7% and use own money which loss income of deposit about 3% are calculated as 671,844 and 547,044 for PV system with energy storage and non energy storage respectively. The solar energy from PV is about 101,616 Bath per year which evaluated by using the value of $5kWh/m^2/day$ from average peak sun hour (PSH) of the Thailand and 6.96 Bath/kWh of Feed in Tariff Incentive. The payback periods of four scenarios are proposed follow as i) PV system with energy storage and use loan money is 15 years ii) PV system with no energy storage and use loan money is 10 years iii) PV system with energy storage and use deposit money is 9 years iv) PV system with energy storage and use deposit money is 7 years. In addition, the other scenarios of economic analysis such no FIT support and other type of economic analysis such NPV and IRR are proposed in this paper.

Power system Design of KITSAT-4 Satellite (과학위성 1호 전력계 설계)

  • 김일송;이준영;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.5 no.5
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    • pp.475-483
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    • 2000
  • This paper describes designs about the power system of KITSAT-4 satellite. The KITSAT-4 power system is mainly composed of power stage and control stage. The power stage is a 200〔W〕 buck converter and control stages are hardware controller and software controller The hardware controller is PPT(Peak Power Tracker), battery voltage controller and software controller is battery current controller and direct duty controller. So the operation of power system has many advantages in that it can select controller according to reliable control and precise control. The controller design methods are presented and the small signal analyses are performed to verify system stability.

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The Study on the Controller for Supplying Stably Power with a Stand-Alone Photovoltaic/Wind/Small Generator Hybrid Power Generation System (독립형 태양광, 풍력, 소형발전기 복합시스템에서 안정적인 전력공급을 위한 컨트롤러에 관한 연구)

  • Choi, Byoung-Soo;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.4
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    • pp.48-56
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    • 2012
  • The object of this paper is the controller for supplying stably power in a separate house in which a hybrid electrical storage system with a stand-alone photovoltaic/wind power generation system and a small generator is applied. In the photovoltaic/wind hybrid power system used in the separate house, when only the battery is used in sunless days, the capacity of the battery is become larger. In particular, as in recent days, if cloudy days are frequent due to anomaly climate, it is difficult to estimate the number of sunless days. Accordingly, it is preferable to build the electrical storage system that numbers of sunshineless days are to be controlled and a shortage amount of the power generation capacity is to be handled by a small generator system. In order to supply stably power of new renewable energy such as solar to any separate houses, it is preferable to reduce the capacity of battery by decreasing the number of sunless days when estimating the capacity of battery and to drive the small generator for compensation of the power shortage. Such system needs components including inverters for photovoltaic and wind power generation system, batteries and controllers for automatically driving the small generator, based upon the nature of the stand-alone house, and it is preferable to use the controller having a simpler and higher stability by adopting the all-in-one scheme to facilitate its maintenance.

Railway Access Alarm System Using Infrared Distance Sensor and Wireless Communication (적외선 센서와 무선통신을 이용한 열차접근경보시스템 개발)

  • Hwang, Yun-Tae;Hwang, Sung-Tae;Lee, Yun-Sung;Kim, Do-Keun;Lee, Tae-Gyu
    • The Journal of the Korea Contents Association
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    • v.17 no.11
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    • pp.303-311
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    • 2017
  • Safety accidents in railway work continue to increase every year; Engineer's negligence, trackside worker's sensory deprivation and signalman's mistake are the main reasons of such incidents. We consider this problem by far the most urgent matter in railway work because of its steady increase and risk of taking a person's life. Based on that account, a new alarm system has developed, that is called Railway Access Alarm System, to allow railway workers to sense the access of trains with not only vision, but also hearing. The detector device of this system is installed on both sides of the track locating 1.5km from the workplace. When the train enters the place, the detector device can sense the entering, sending the detect sign of train to the alarm unit, then the alarm unit warns the workers by the LED lighting and sirens. This system has several advantages compared to previous systems. First, it recognizes the train at a long distance. Secondly, there is no need for wiring work since it is a wireless system. At last, the system works by rechargeable batteries and solar charger so that it is installed in the work places where there is no external power supply. Moreover, it is proven that the system is 100% reliable by the successful on-the spot inspection evaluating the capability.