مبدل چند سطحي جهت بكارگيري سيستم ذخيره سازي انرژي باتري براي كاربرد پيك سايي

چكيده انگليسي :

Battery Balancing using Half bridge Multi terminal Converter for Power Peak Shaving Application Afshin Bagheri Vandaei Afshin bagheri@ec iut ac ir Date of Submission 2013 30 09 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Ahmadreza Tabesh a tabesh@cc iut ac ir Mehdi Moallem moallem@cc iut ac irAbstract Batteries are among the promising electrical energy storage technologies for industrial and commercialapplications These energy storages have been used for making intermittent renewable resources dispatchableand controllable They also used in various applications such as uninterruptable power supply and powerpeak shaving The power peak shaving process shifts a power demand from peak time to a low demand timevia using the stored energy in batteries In this process the batteries store energy during off peak times whenthe power demand and generation cost is low The peak shaving process increases the transmission linecapacity at peak time which in turn increases flexibilities in management of transmission line capacities Thus peak shaving can potentially defer the reinforcement of a line and or postpone the establishment of anew line in the power system It also postpones the immediate needs for development of new power plants tomeet ever increasing demand in a power system Economically the main challenge in proliferations ofbattery energy storage systems is the high investment cost which necessitates advance charge dischargecontrol methods to increase the lifetime of the batteries Battery balancing which equalizes the state of charge of the batteries is among the key control methods to increase the lifetime of the batteries Batterybalancing needs dc ac power converters with multi terminal at dc side Thus the main technologicalchallenge in the implementation of high power converter for energy storage system is introducing suitabletopologies for megawatts power exchanges at high voltage level with multiple dc terminals This thesis investigates the battery energy storage systems for power peak shaving applications andpresents a multi terminal power converter topology based on a half bridge switch configuration In the firstpart of the thesis various energy storage systems and their applications in transmission and distributionsystems are investigated Then by focusing on the peak shaving application and its requirements such asenergy density life time cycles and charging discharging capacities the suitable storages including lead acid and sodium sulfide batteries are introduced and investigated in more details The second part of thethesis briefly investigates various power converter topologies for high power and medium voltageapplications Then a multi terminal topology is proposed based on half bridge switch cells as a suitableconverter topology for energy storage applications Compare with conventional cascade full bridgetopologies the proposed half bridge topology provides twice dc terminals with the same number of switcheswhich are used in full bridge topologies Thus the suggested half bridge topology can potentially enhancethe lifetime of the energy storage system via battery balancing among more battery modules Theperformance of the proposed topology and the validity of its control method have been verified via the timedomain simulation of a three phase study system with four cells in each phase Furthermore a grid connectedsingle phase prototype with four 12 V 6 Ah leads acid batteries are implemented to practically test thesuggested power flow and battery balancing control systems Keywords Battery Energy Storage System Multi level converter Power Peak shaving Real Reactive Power Control State Of Charge SOC Balancing Voltage Balancing

باقري وندائي، افشين

مبدل چند سطحي جهت بكارگيري سيستم ذخيره سازي انرژي باتري براي كاربرد پيك سايي

كنترل توان اكتيو , متعادل سازي حالت شارژ , متعادل سازي ولتاژ , مدولاسيون پنهاي پالس