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이종인(Lee Jong-In),유병규(Yu Beyng-Gyu),유권종(Yu Gwen-Jong),김흥근(Kim Heung-Geun) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
The Power Conditioning System is Power Transfer System which make array DC current to the Grid sinusoidal current. These are Low Frequency Transformer Inverter Type, High Frequency Transformer Inverter Type and Transformer-less Type. Low Frequency Transformer Type has a Excellent Isolation property, but doesn't have competitiveness in Size and Cost. Also High Frequency Transformer Type has a good Isolation property but there are many steps in Power transfer Switching. Nowadays, Transformer-less Type inverter change a transformer to DC/DC Converter which is small and cost effective. In this paper shown the DC/DC Converter Transformer-less Type multi-string inverter design and simulation. The Control Algorithm will be introduced and Simulation was accomplished.
이종인(Lee Jong-In),유병규(Yu Beyng-Gyu),유권종(Yu Gwen-Jong),김흥근(Kim Heung-Geun) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Grid-connected systems operating in conjunction with a commercial system because the system protection coordination, power quality, harmonic current generation, control and islanding detection of problems and challenges are raised. Islanding detection among other things, as required by the necessity to guarantee the reliability of detection techniques has been steadily on research. In this paper, the phenomenon itself actively driving the change in frequency from the frequency variation technique and the change in cf using the correlation of the frequency change detection method is proposed and a new single operation through simulation verified the validity and effectiveness.