بررسي اينورتر فلاي بك متصل به شبكه در كاربرد ماژول ac فوتوولتائيك و ارائه ي يك راهكار جداسازي توان در اين ساختار

چكيده انگليسي :

Design and Analysis of Single Stage Flyback Inverter with Power Decoupling Capability in ac Module Application Peyman Neshaastegaran p neshaastegaran@ec iut ac ir Date of Submission 2013 04 15 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Hamidreza Karshenas karshen@cc iut ac ir Abstract Ac modules ACM are state of the art method for implementation of grid connected photovoltaic PV systems Compared with other methods of PV module connection ACMs have distinct advantages which make them an optimum option specially in building integrated PV BIPV systems Power Electronic PE interface which is installed on the back of PV ACM plays a key role in processing and transferring of the PV power to the grid PE interfaces based on the number of power processing stages which they have are classified under two categories single stage and multi stage Single stage structures have less power components and are the preferred option to be used in ACM application Flyback Inverter FI due to the low number of components and simple structure is among the popular single stage PE interfaces used in ACMs Despite modifications made by researchers in FI topology and control circuit application of this inverter in ACMs was limited to Discontinuous Conduction Mode DCM type while two other operating modes i e Continuous Conduction Mode CCM and Boundary Conduction Mode BCM were not considered as the alternative options A comparative review of FI is presented in chapter four of the thesis and two operating modes which are applicable in ACM i e DCM and CCM are compared from different viewpoints Almost without any exception PE interface in ACMs includes a single phase inverter Single phase inverters face the problem of power pulsation with double grid frequency in their input level PV panel in ACMs have constant output power and voltage Power pulsation at input of the inverter output of the panel will cause deviation of PV voltage from MPP A conventional method to solve the power pulsation problem is using a bulky electrolytic capacitor at inverter input This capacitor has short life time compared with other ACM parts and from reliability standpoint is problematic for the whole PV system thus to guaranty the maximum system reliability and life time an active circuit or filter called power decoupling circuit including a small film capacitor may be used instead of abovementioned electrolytic capacitor This thesis presents a new power decoupling circuit designed to be used in a DCM FI in ACM application which makes the power decoupling function possible with a small film capacitor In addition to use a small capacitor compared with other power decoupling methods proposed circuit uses only 3 high frequency switches while the two other switches at the second side of the flyback transformer work at grid frequency thus having negligible switching losses This circuit is designed with three different configuration of elements thus making it possible to evaluate the operation of the structure in three different operating points and to investigate the effects of variation in key components in the circuit Results and analysis are verified through the circuit simulation in PSIM software thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis In this thesis Keywords PV ac module power electronic interface flyback inverter power decouplin PDF created with pdfFactory trial version www pdffactory com

نشاسته گران، پيمان

بررسي اينورتر فلاي بك متصل به شبكه در كاربرد ماژول ac فوتوولتائيك و ارائه ي يك راهكار جداسازي توان در اين ساختار

سيستم فوتوولتائيك , ماژول ac , نوسان توان