مدل سازي سيستم هاي ذخيره ساز جهت مطالعات قابليت اطمينان و تعيين ظرفيت بهبنه اجزاي سيستم هاي انرژي باد جدا از شبكه

چكيده انگليسي :

Storage System Modelling for Reliability Studies and Optimum Size Selection in Standalone Wind Energy Systems Hossein Delavaripour h delavarypour@ec iut ac ir Date of Submission 2011 11 26 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language PersianSupervisor Hamidreza Karshenas karshen@cc iut ac irAbstractThis thesis deals with accurate modelling of energy storage systems in standalone wind energysystems when the reliability and cost optimization are of interest In recent years the use ofrenewable energy resources such as wind and solar has faced a rapid growth due to theenvironment friendly nature of these sources on one hand and increasing cost of fosile fuels on theother In vast countries there are some remote and unreachable areas which are far from the powersystem grid Using renewable energy sources to supply electricity in such areas could have manytechnical and economical advantages For example the cost of expensive transmission lines can besaved Many renewable energy resources are atmosphere dependent and thus have intermittentgeneration nature Therefore in most cases they alone cannot provide an uninterrupted and reliablesource of energy The solution is to use these resources besides other types of energy supplieswhich are readily dispatchable Energy storage systems are good candidate for such applications They can store energy when it exceeds the demand and release that energy when the generationdoes not suffice the load Such hybrid energy systems must be designed in such a way that theyhave a reasonable reliability at justifiable cost The reliability of small standalone networks isevaluated by determinig the ability of supplying the demand In this way the system adequacy isexamined by probablistic techniques based on analytic methods The disadvantage of analyticalmethods in evaluating wind systems is the fact that they do not consider the time variation of windspeed which has a significant effect on reliability of these systems In addition the existence ofstorage systems adds to the complexity of problem In this thesis the reliability indices areobtained based on analytical methods and time series simulation of system behavior In thismethod a time series is used to express the energy and power associated with each component Inperforming such analysis the accurate modelling of system components is very important Specifically it is shown in this thesis that how the accurate modelling of energy storage systemscan affect the reliability indices A reliability index called loss of load expectation or LOLE isobtained for different scenarios and the resultas are compared Generally the initial cost of energysystems with renewable resources is more than the cost of traditional systems such as motor genarator sets What makes renewable systems more attractive are small running costs and theincentives given by the government In this regard the system configutation in terms of the typeand size of different resources plays an important role in designing an economically viable system For example a wind only system will be too expensive to supply the load with reasonablereliability A diesel generator has much lower initial cost but the penalties associated withpollution and the cost of supplying fuel to it may impose high running cost Energy storagesystems also have relatively high initial cost Therefore a comprehensive study is required in orderto determine the optimum size of different components in such systems An optimazation problemis formulated in this thesis based on various constraints and consequently is solved using geneticalgorithms Again the results for different scenarios are presented and compared with Keywords Renewable sources Energy storage systems Reliability Optimum sizeselection

دلاوري پور، حسين

مدل سازي سيستم هاي ذخيره ساز جهت مطالعات قابليت اطمينان و تعيين ظرفيت بهبنه اجزاي سيستم هاي انرژي باد جدا از شبكه

منابع تجديدپذير , كفايت سيستم