مباني طراحي ريز شبكه ي DC شامل نيروگاه هاي فتوولتايي

چكيده انگليسي :

esign Considerations of DC Micro grids Including D Photovoltaic Power Plants Sayed Amir Sayed Fattahi amir fatahi@ec iut ac ir Data of Submission 2015 01 04 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran 84156 83111Degree Master of Science Language PersianSupervisor Dr Ahmadreza Tabesh a tabesh@cc iut ac irAbstract This thesis deals with the design consideration of dc microgrids with emphasis on theselection of medium voltage level based on a techno economical analysis Conventional acmicrogrids use electronically interfaced distributed generation units which often includerenewable energy resources such wind and photovoltaic power plants Many renewable resourcesand energy storages primarily use dc links in their power converter units On the other hand theend user consumers of the energy often need to receive electric power in dc form Hence in amicrogrid with renewable resources the generated power can be more effectively transferred tothe loads if a dc transmission system is used instead of an ac one The idea of using dc microgridis now among the promising solutions for the expansion of future microgrids due to the vastamount of incentives in proliferations of renewable resources The main challenges in developingdc power systems are dc dc high power conversion and dc circuit breakers Recent advances inhigh power converter topologies and especially developing topologies for dc circuit breakersenable realization of dc power systems as an emerging solution for more efficient microgrids innear future The thesis mainly investigates the design considerations and control issues of dcmicrogrids specifically with focus on the design of medium voltage levels for an optimaloperation based on a trade off between initial cost and power losses The suggested designalgorithm is then used for the design of a virtual dc microgrid for Isfahan University ofTechnology IUT as a case study In this case study the loads estimated based on status of thecampuses and residential areas at IUT Two photovoltaic power plants in kW and MW scales arealso considered in the suggested dc microgrids The thesis also presents a power flow method fordc power systems including high power dc dc converters Such an algorithm for power flowanalysis has not been systematically discussed in existing literatures for the dc power systems Inthe last part of the thesis the controller design issue for a dc microgrid is investigated which ismainly established based on extension of the concepts of primary secondary and tertiary controlloops in conventional ac microgrids Finally the performance of the designed controllers isinvestigated based on time domain simulation of a study system in PSCAD EMTDC simulationsoftware tool The simulation results show that the suggested control provision for the dcmicrogrid can maintain the stability of the voltages at dc buses following various disturbances andfault scenarios within the system Keywords DC power systems dc microgrids renewable energy resources photovoltaicpower plants distributed generations dc power system design

فتاحي، امير

مباني طراحي ريز شبكه ي DC شامل نيروگاه هاي فتوولتايي

منابع انرژي تجديد پذير , كلكتورهاي dc فتوولتايي , منابع توليد پراكنده , سيستم توزيع dc , طراحي ريز شبكه dc