ارائه مبدل غير ايزوله DC-DC سه‌درگاهي بسيار افزاينده بر پايه مبدل سپيك

چكيده انگليسي :

Proposing Non isolated High Step up DC DC Three port Converters Based on SEPIC Converter Rasoul Cheraghi r cheraghi@ec iut ac ir September 2019 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Mohammad Sadegh Golsorkhi golsorkhi@cc iut ac ir advisor Dr Ehsan Adib e adib@cc iut ac ir AbstractIn today s world global warming that is due to use of fossil fuels is becoming an important issue and motivatesus to use renewable energy sources such as solar and wind energy Because of safety requirements and the issueof partial shading the parallel configuration of the solar panels is preferable compared to the series scheme inresidential PV systems However since the voltage of each panel is considerably lower than the electrical gridvoltage implementation of the parallel configuration necessitates the use of a high step up DC DC converter to adaptthe PV voltage level to the load voltage level If the energy generation unit is equipped with battery for energy storage another high step up converter might be used to increase the output voltage of the battery to the high voltage levelrequired by the PV inverter The utilization of separate DC DC converters for the PV generation and battery storageunits is inefficient and bulky and it also increases the overall cost of the system Separate DC DC converters can besubstituted with a multi port DC DC converter Recently researches have been focusing on combining all DC DCstages into a single compact and low cost converter which includes inputs for PV modules and a bidirectional pathfor the battery port This kind of converters are known as TPCs In this thesis after reviewing some of the recentlydeveloped TPCs the first TPC is proposed which is based in the SEPIC converter and includes only two switches One of the switches is turned on under ZVS condition intrinsically and the other one is turned on under very lowvoltage low current Therefore the switching losses of the converter is reduced considerably The conduction lossesof the converter are also very low because of using minimum semiconductor elements in the high current paths suchas PV and battery port current paths One of the other key features of the proposed converter is the low currentripple for the PV input which is necessary for better utilization of MPPT without using extra filters Both of theswitches operate under low voltage stress in comparison to the output terminal voltage and this feature leads toutilization of lower drain to source resistance and therefore lower conduction losses The second proposed converteris similar to the first one but with lower switching losses and better voltage gain Actually the turn off switchinglosses of the converter is reduced to zero because of suing two passive lossless snubbers All modes of operation design considerations and experimental results for both of the proposed converters are presented and at last theyare compared to other TPCs Key Words DC DC power converter Hybrid power system High step up Three port con verter

چراغي، رسول

ارائه مبدل غير ايزوله DC-DC سه‌درگاهي بسيار افزاينده بر پايه مبدل سپيك

مبدل دي سي به دي سي , مبدل بسيار افزاينده , انرژي خورشيدي , مبدل سه درگاهي