مديريت شارژ خودروهاي الكتريكي براي جبران سازي عدم تعادل در شبكه توزيع ثانويه با در نظرگرفتن آلودگي هاي هارمونيكي

چكيده انگليسي :

Electric Vehicles Charging Management for Imbalance Compensation of Secondary Distribution Networks in the Presence of Harmonic Pollutions Sayed Vahid Saleh v saleh@ec iut ac ir Date of Submission 2019 1 19 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Amin Latify latify@cc iut ac irAdvisor Mohammad Esmaeel Hamedani Golshan hgolshan@cc iut ac irAbstract Preventing more environmental issues and relieving reliance on fossil fuels motivate the governments andpolicy makers to encourage people to use more efficient and qualified electric vehicles EVs in comparisonwith conventional vehicles As all or portion of EVs energy is supplied from secondary distribution system uncontrolled and simultaneous charging of them would cause serious operational issues for secondary distribu tion systems Some of the common issues in the secondary distribution system operation are the power currentand voltage imbalances Increased losses increased current in neutral wires and shift in neutral point are theresults of the imbalance issue This issue can be exacerbated by uncontrolled EVs charging This challengecould change to a bottleneck in penetrating EVs into the distribution system and should be resolved Therefore an EVs charging coordination framework is required Another common issue in secondary distribution system operation is the harmonic pollution Although fromthe power quality point of view the two mentioned issues are treated differently resolving imbalance challengecannot be achieved without considering harmonic pollution since these two issues have the same impacts onlosses current in neutral wires and shift in neutral point Therefore the EVs charging coordination frameworkshould be designed in such a way that the imbalance and harmonic issues are jointly addressed in Interface between EV battery and secondary distribution system is battery charger that is a power electronic based device These devices can easily control active and reactive power flow of the charger as well as harmon ics of injected current In this research we consider single phase and three phase charging systems simultane ously equipped with mentioned control capabilities Moreover we assume that power transfer between phasesin the three phase charging systems are possible To communicate with EV charging systems we consider that asmart communication infrastructure is provided by the distribution system operator Based on this assumptions EVs charging coordination problem is modeled as an optimization problem with voltage imbalances and har monic pollution minimization as the joint objective function The model constraints consist of harmonic powerflow equations EVs constraints and distribution system operational constraints In order to reduce solving timeand achieve global optimum nonlinear terms are linearized using some linearization techniques Therefore theoptimization model is recast as a linear optimization problem The proposed model is implemented in a 39 bustest system and the numerical results are provided and analyzed As in practice some of the input parametersare stochastic the proposed deterministic optimization model is developed to a stochastic optimization model Residential load profile arrival and departure time of EVs and the battery state of charge when the EVs areplugged into the distribution system are stochastic parameters that are considered The proposed stochastic op timization model is implemented in the 39 bus test system and the numerical results are provided and analyzed The numerical results show the efficiency and efficacy of the proposed models in improving the operationalconditions of secondary distribution networks Keywords Electric vehicles Charging coordination Secondry distribution system Imbalance Harmonicpollution

صالح، وحيد

مديريت شارژ خودروهاي الكتريكي براي جبران سازي عدم تعادل در شبكه توزيع ثانويه با در نظرگرفتن آلودگي هاي هارمونيكي

خودروهاي الكتريكي , مديريت شارژ , شبكه توزيع ثانويه , عدم تعادل , آلودگي هارمونيكي