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Comparative experiments for Concentration and Tracking in Photovoltaic Power Generation

Comparative experiments for Concentration and Tracking in Photovoltaic Power Generation

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Comparative experiments for Concentration and Tracking in Photovoltaic Power Generation

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  1. Comparative experiments for Concentration and Tracking in Photovoltaic Power Generation 2005. 10. 7 Hyun-Kyung Oh Korea Maritime University

  2. Contents Ⅰ. Background & Objectives Ⅱ. Configuration of experimentalSystem Ⅲ. Analysis of experimental results Ⅳ. Conclusion and Future Study

  3. Background & Objective The Kyoto protocol & it’s effects • Environmental agreement more than 150 countries helps to reduce gas emission that are suspected to be the cause of global warming. • The Kyoto Protocol entered into force on 16th Feb. 2005. • Joint implementation of Korea was postponed up to 2012 year, but amount of CO2 emission as of 2002 is 1.87% of world • A plan to diffuse 10 thousands of sun roofs which is 3kW grid connected PV power generation until 2006 year • Substitute 5% of total nation’s energy with alternative energy until 2011 year Korean government :

  4. Background & Objective • Supports 250 billion Won during 5 years from May of 2004 in the fields of alternative energy resource like fuel cell, wind force and PV and to develop technology of 5 million Won per kW of PV until 2012 year Market of PV

  5. Month Power generated[ WH] Total Power generated Background & Objective PV-1(230,30) PV-2(180,30) PV-3(180,50) 1 92,341 96,211 83,576 272,128 azimuth angle tilting angle 2 98,248 105,841 84,987 289,076 Spring time is clear and sunny 3 100,511 109,103 92,629 302,243 4 106,156 114,157 94,461 314,774 5 104,704 109,051 90,968 304,723 6 116,540 123,242 91,622 331,404 7 89,152 98,813 74,743 262,708 8 74,061 83,458 61,850 219,369 9 98,357 119,977 78,039 296,373 10 111,286 127,062 88,195 326,543 11 94,516 111,677 76,294 282,487 12 82,124 91,201 72,891 246,216 Total 1,167,995 1,289,791 965,255 3,448,044 Operating results of Chosun University system Tilting angle is more important than azimuth angle and spring time is better season for PV power generation. In Chosun University from 2001 during 2 years, 3 kW grid connected PV system. Solar modules into three groups with each 1 kW, 20 sheets of solar modules.

  6. Background & Objective • Cost of PV module is over 70% of total solar generation plant cost. • To reduce cost per kW • Increasing the efficiency of PV (Now 15 to 18% efficiency) and reduce PV cost with mass production • System optimization including grid connected inverter • Efficient methodology like concentration, tracking of sun and system

  7. Background & Objective Efficiency changes by concentration Current changes by concentration Spectrolab Inc. USA

  8. Configuration of System Specification of PV Module

  9. Configuration of System • System II • Concentration and trackable solar module • With Cooling system Fixed solar module and concentrating solar module • System I • Fixed to south direction and 35 degree tilting angle • No Cooling system

  10. Configuration of System Schematic diagram of experiment Data Aqusition system Collect voltage, current and temperature in every 5 sec. of system I and II Remote Monitoring system Display data on monitor and save to database and file in every 1 min.

  11. Configuration of System Monitor display of PV system System I System II

  12. Analysis of experimental results System II generate about 90% of rating power and steady right after sunrise System II generate steady good quality of power even though thin cloudy day . System I depend on light and kaleidoscopic change Generated power of System I and System II during a day Date : 29th Aug. 2005 Weather : In the morning(Clean sky),Afternoon(Clound 30%) System I no cooling, System II cooling

  13. Analysis of experimental results Temperature changes of system I and System II during a day Temperature of System II is Similar with System I due to Expended tube fin type cooling system, efficiency of cooling is not good

  14. Analysis of experimental results Comparison of practical usage of solar radiation System II use over 30% of solar radiation in the morning Mid day two systems are similar but System II shows better result until sunset

  15. Analysis of experimental results 3 times Concentration Date : 29th Sep. 2005 Weather : In the morning(Cloud 70%),Afternoon(Clean sky) System I no cooling, System II cooling

  16. Analysis of experimental results 3 times Concentration

  17. Analysis of experimental results 3 times Concentration

  18. Conclusion & Future Study • According to coming force of Kyoto protocol there are too much concerning about clean energy. • Concentration and tracking system can reduce cost per kW effectively in PV generation. • 3 times concentration system can be applied without additional cooling system. • If cooling heat can be recycled , combination system of solar heat and power is more effective. • Tracking system is available because tilting angle affect to the efficiency of PV . • Practical studies of grid connected concentration and tracking PV generation system are needed in near future.