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Report about lecture given by prof. dr Dragan Jovčić, held on October/26/2018. The lecture entitled „DC TRANSMISSION GRIDS: Components, Modelling, Control and Protection Challenges” was held 10/26/2018. in room 211 at Electrical enginering institute „Nikola Tesla“ at Belgrade. The lecture was directed to young professionals coming from industry and to students of the final year. At the beginning of the lecture presentation the IEEE PES Chapter Outstanding Engineer Award for 2017 is handed to dr Ninel Čukalevski. After award delivery ceremony prof. dr Dragan Jovčić gave very interesting lecture aimed to relate the young attendees and practicing engineers to modern problems in DC transmission grids and applied power electronics. High Voltage DC Transmission has seen rapid technology advances in the last 20 years driven by the implementation of VSI (Voltage Source Converters) at MW and GW powers and in particular introduction of MMC (Modular Multilevel Converters)The primary motivation for DC grid development is the need to interconnect multiple DC lines in close proximity, and to enable power trading between many DC terminals. The presentation addressed some key technical challenges in DC grid development and discussed the current technology status. MMC concept, including halfbridge and full bridge modules, represent building blocks in most DC grid converters today and further improvements are expected in terms of efficiency and fault handling. Very fast DC CB (Circuit Breakers) have becoming commercially available recently, but the cost is still considerably higher than AC CBs. DC grid modelling is facing the challenge of numerous converters dynamically coupled trough lowimpedance DC cables/lines. The averagevalue modelling is used, commonly in rotating DQ frame. The control of DC grids requires new solutions since there is no systemwide common frequency to indicate and correct the power unbalance.

„DC TRANSMISSION GRIDS: and Challenges” · Report about lecture given by prof. dr Dragan Jovčić, held on October/26/2018. The lecture entitled „DC TRANSMISSION GRIDS: Components,

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  •  Report about lecture given by prof. dr Dragan Jovčić, held on October/26/2018. 

    The  lecture entitled „DC TRANSMISSION GRIDS: Components, Modelling, Control and Protection Challenges” was held 10/26/2018.  in  room 211 at Electrical enginering  institute  „Nikola Tesla“ at Belgrade. The lecture was directed to young professionals coming from industry and to students of the  final  year.  At  the  beginning  of  the  lecture  presentation  the  IEEE  PES  Chapter  Outstanding Engineer Award for 2017 is handed to dr Ninel Čukalevski. 

     

    After award delivery ceremony prof. dr Dragan Jovčić gave very  interesting  lecture aimed to relate the  young  attendees  and  practicing  engineers  to modern  problems  in DC  transmission  grids  and applied power electronics.  

    High Voltage DC Transmission has seen rapid technology advances in the last 20 years driven by the implementation  of  VSI  (Voltage  Source  Converters)  at  MW  and  GW  powers  and  in  particular introduction  of  MMC  (Modular  Multilevel  Converters)The  primary  motivation  for  DC  grid development  is the need to interconnect multiple DC lines in close proximity, and to enable power trading between many DC terminals. The presentation addressed some key technical challenges  in DC grid development and discussed the current technology status. 

    MMC concept,  including half‐bridge and  full bridge modules, represent building blocks  in most DC grid  converters  today  and  further  improvements  are  expected  in  terms  of  efficiency  and  fault handling. 

    Very fast DC CB (Circuit Breakers) have becoming commercially available recently, but the cost is still considerably higher than AC CBs. 

    DC grid modelling  is facing the challenge of numerous converters dynamically coupled trough  low‐impedance DC cables/lines. The average‐value modelling  is used, commonly  in  rotating DQ  frame. The control of DC grids requires new solutions since there is no system‐wide common frequency to indicate and correct the power unbalance. 

  • The  protecton  of DC  grids  is  a  significant  technical  challenge,  both  in  terms  of  components  and protection  system  development.  A  reasonably  accurate  and  reliable  DC  grid  protection  can  be developed using local traveling wave measurements. 

     

     

    In the following discussion related to proposed DC grid converter and control  improvements the 6 attendees took part. The lecturer gave professional directions for further research in the DC grid and related components area. The professional importance of IEEE membership is strongly stressed. 

  •  

    There were 23 attendees at  lecture, among  them  the 8 were members of  IEEE S&M PES Chapter. The majority  of  attendees  are  final  year  students  and  staff members  of  the  School  of  Electrical Engineering of University of Belgrade and practicing engineers form Electrical engineering  institute “Nikola Tesla” and Institute “Mihajlo Pupin”. 

     

  • After  lecture  there  was  organised  a  small  celebration  with  Distinguished  lecturer  and  Award recipient together with Chapter board members 

    Report about IEEE PES Chapter Outstanding Engineer Award 2017 delivery to dr Ninel Čukalevski  

     

    Before the  lecture of prof. dr Dragan  Jovčić held on October/26/2018,  in front of the attendees  in room 211 at Electrical enginering institute „Nikola Tesla“ at Belgrade, the Chapter Vice Chair of IEEE Chapter Power & Energy (PE‐31), Belgrade, Republic of Serbia, dr Jasna Dragosavac, handed the IEEE PES Chapter Outstanding Engineer Award for 2017 year to well known power transmission expert, dr Ninel Čukalevski. During that occasion dr Dragosavac highlighted the credit of dr Ninel Čukalevski for achieving the recognizable professional and educational impact at national and international level.     

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