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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.