3rd Asia-Korea Conference on Science and Technology 2013

Tutorial 1: Power Grid Technologies for an energy system with electricity generation from renewable energy sources and new solutions for energy storage and integration of electrical vehicles

   Dr. Lina Bertling Tjernberg


Dr. Lina Bertling Tjernberg is Professor in Power Grid Technology at KTH - the Royal Institute of Technology. Her research aims to develop models for electric power solutions for the future sustainable energy system - currently captured in the concept of Smart Grid. Areas of special expertise are in applied reliability theory and maintenance management.

Dr. Bertling Tjernberg is a Senior Member of IEEE and is the Chair of the Swedish PE/PEL Chapter. In 2016 she was appointed as Distinguished Lecturer of IEEE Power & Energy Society (PES). She has served in the Governing Board of IEEE PES 2012-2015, as an Editor for the IEEE Transactions on Smart Grid Technologies (2010-2016) and chaired the first IEEE Innovative Smart Grid Technologies Conference (ISGT) Europe in Sweden in 2010. She is a Member of Cigré, and the National Committee of the IEA International Smart Grid Action Network (ISGAN) and is an expert for the EU commission within Energy, ICT and Security.


Power Grid Technologies for an energy system with electricity generation from renewable energy sources and new solutions for energy storage and integration of electrical vehicles.
The electric power system is being modernized to enable a sustainable energy system. New developments include possibilities and challenges with generation, delivery and usage of electricity as an integrated part of the energy system. This involves new forms of usage of electricity, e.g. for transportation and demand response, and to the updating of existing electricity infrastructures. For electricity generation the trend is toward new large-scale developments, like offshore wind farms, as well as small-scale developments like rooftop solar energy. At the same time, digitalization of society is creating new opportunities for control and automation as well as new business models and energy related services. In Europe an effect of these developments can be seen in huge increase in new capacity, in mainly from wind and solar, during the last years. This development has however resulted in several challenges for the transmission system. The European Network of Transmission System Operators, ENTSO- E, has identified that 80% of the identified 100 bottlenecks in the transmission system in Europe are related to integration of renewable energy sources.

The main challenges for the current developments of the European power system can be summarized as follows (resulting from the EU project ERA-Net):

  • Enabling an increased flexibility of the power system to cope with the growing share of intermittent, variable and decentralized renewable generation and managing the complex interactions.
  • Increase network capacity to support increased generation and transmission resulting from renewables and in support of the internal energy market.
  • Provide information, services, market architectures and privacy guarantees to support open markets for energy products and services, whilst facilitating the active participation of customers.
This presentation will give an introduction to Smart Grid with a European perspective, and shows on challenges and possibilities. Examples will be given on Smart Grid Demonstration projects and from own research work.

Tutorial 2: Power Swing Phenomenon and Out-of-Step Protection Design

   Dr. R. Nagaraja


Dr. R. Nagaraja is the founder and Managing Director of M/s. Power Research & Development Consultants Pvt. Ltd., Bangalore, INDIA. He has vast experience of 27 years in the field of power system simulation and consulting. His specialization includes Power System Analysis, Operations, Power Engineering Education and Power System Protection. He has conducted several power system studies and analyzed several grid disturbances both in India and outside country.

He is the architecture and chief mentor for the design and development of the MiPower - Power system analysis software package widely used by Electric utilities, Industries, Consultants and Educational Institutions for power system analysis and research purposes.

Dr. R. Nagaraja has worked in the smart grid sphere and has guided the development of tools as part of SCADA and EMS in power industry.

Dr. R. Nagaraja is Senior Member of IEEE and currently Chapter Representative for Power Engineering Society (PES) for R-10 West Chapters. He has contributed to IEEE by holding various positions and also as Chair for IEEE PES, Bangalore Chapter.


Protection of the electrical system is one of the important tasks in the power engineering field. Power system protection engineering field deals with precautionary measures to be taken to safeguard the power system during abnormal operating conditions. The practice of protection engineering involves conducting periodic fault studies followed by protective relay setting, checking and co-ordination studies. These studies are necessary to ensure that the wide variety of protective relays function correctly with proper discrimination to provide the requisite reliable, sensitive and selective isolation of faulty power system equipment. Frequently, there is also the need to conduct detailed post mortem analysis to investigate whether the relays and breakers responded correctly to certain system faults. These activities are highly data intensive. In the recent past, it has been noted that most of the grid collapses have been attributed to protection system failure or mal functioning. The reports on major grid disturbances have all emphasized the need for conducting adequate simulation studies to improve the power-swing protection philosophy and to design separate out of step detection and system separation schemes. While the power-swing protection philosophy is simple, it is often difficult toimplement it in a large power system because of the complexity of the system andthe different operating conditions that must be studied. Tutorial covers the basic definitions related to power swing and out of step protection, explains the phenomenon of power swing with illustrative cases, discusses the power swing detection and blocking schemes and focuses the design of out of step protection schemes through illustrative examples.

Reference: IEEE Power System Relaying Committee, "Power-swing and out-of-step considerations on transmission lines," July 19, 2005.

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