Integration of Uncertainty into Planning and Operation of Electric Power Grids

The penetration of variable renewable generation is expected to increase further over the years to enable a sustainable energy future. The efficient integration of these resources poses new challenges to the planning and the operation of the electric power system. Particularly the uncertainty that is inherent in the power output of these resources may require changes to how we dispatch other generation and storage resources and how we determine capacity reserves needed to balance unexpected variations in net load. Not accounting for such uncertainties poses the risk of either making the grid less reliable or operating it not in the most efficient manner. Hence, new methods and approaches are needed to integrate these intermittent resources. Some of them will be discussed in the upcoming workshop with inputs from industry and academia.

Date and Time: February 22, 2017 at 13:00

Location: ETH Zentrum, Zürich, Leonhardstrasse 21, LEE E 101 (link to search.ch)

Please register here: https://events.vtools.ieee.org/meeting_registration/register/43291

Fees (including break and apero): CHF 50.- for IEEE members, CHF 60.- for non-members, CHF 30.- for IEEE student members, CHF 40.- for non-students members

Cash payment at the event, no credit or debit cards!

Program as PDF


13:00 – 13:15

by the Chair of the Swiss Chapter of IEEE PES

Gabriela Hug



13:15 – 14:00

Challenges and potential solutions for integrating variable renewable energy sources (V-RES)

Yaman C. Evrenosoglu

Global power balance is tipping irreversibly towards renewables driven by the decreasing technology costs, and governmental subsidies. Renewables are projected to constitute 50% of global power generation in 2040. The main growth is foreseen in variable renewables such as wind and solar PV, which together represented nearly 40% of total added generation capacity in 2015. There are significant potential challenges for transmission and distribution network operators to accommodate these energy sources in such a way that the static (e.g. n-1, steady-state voltage stability) as well as the dynamic (e.g. frequency stability) security of the grid is not jeopardized at very high levels of instantaneous penetration. ABB has been developing various frameworks in order to quantify the challenges and assess required solutions and technologies as enablers. In this talk, some work based on unit commitment analysis along with a vision for the future of power systems will be shared.

Cansin Yaman Evrenosoglu obtained his B.S. and M.S. degrees from Istanbul Technical University, Istanbul, Turkey in 1998 and 2001 respectively and his Ph.D. degree from Department of Electrical and Computer Engineering at Texas A&M University, College Station, Texas in 2006. He worked for Nexant Inc. Software & Information Systems group as a senior consultant before he joined the Electrical and Biomedical Engineering Department at University of Nevada Reno in August 2008. From 2011 until 2014 he was with the Department of Electrical & Computer Engineering at Virginia Tech. Currently he is a Principal Scientist in the Automation Department at ABB Corporate Research Center in Switzerland. His research interests are power system state estimation and forecasting, fault location, application of optimization methods in power systems, wholesale electric energy market analysis and design, asset management and maintenance optimization, and reliable integration of intermittent sources to electrical power grid. He publishes and serves as a reviewer in IEEE journals and conferences, serves as an Editor of IEEE Transactions on Smart Grid, and is a Senior Member of IEEE.


14:00 – 14:45

Expected development of the distribution grid of Zurich until 2050

Raffael La Fauci


Various challenges exist for the planning of the distribution grid of Zurich. The electric grid required in the future depends on the development of the population, technological and regulatory environment. However, decisions for the planning have to be made today because grid elements, e.g. cables, have a life span of over 40 years and are installed continuously. For an efficient integration of new buildings, renewables and electric mobility, studies have been conducted and the assumed scenarios will be revised periodically. This presentation shows the assumptions made by ewz and how all factors are considered.

Raffael La Fauci received his MSc and PhD from ETH Zurich. His research involved planning of an electric distribution grid for emergency power supply. He conducted his PhD at ewz, the DSO of Zurich. During this time, he also worked in various projects with focus on grid integration of renewables. Since 2015, Dr. La Fauci is the head of the department grid development at ewz and responsible for the strategic planning of the electric grid of Zurich. Since 2016, he is member of SEG 6 of IEC (Non-conventional Distribution Networks / Microgrids).


14:45 – 15:15




15:15 – 16:00

Optimal Exploitation of Decentralised Energy Systems

Karl Werlen


Misurio has developed a multistage optimisation routine for preparing tenders for system services (control energy reserve) and spot market. The procedure includes the use of stochastic parameters and factors in trade-offs between system service and spot market price signals. In this presentation, it is shown how optimisation routine applies to decentralised energy systems and demonstrates practical examples.

Karl Werlen, born in 1962, studied electrical engineering at ETH Zurich and received his PhD from the institute of power systems in 1993. He was co-founder and executive of several start-ups. Since 2008 he is partner and director of Misurio AG in Visp VS where he works with a team of currently 12 employees. Karl Werlen has accumulated experience in optimisation studies and tools, with strong competences in the creation of models and simulations. He has implemented several projects with diverse clients in the energy sector, and combines strong technical knowhow with operations management.


16:00 – 16:45

Impact of Renewables on Axpo’s Subtransmission Grid and Tools Deployed for Optimisation

Jörg Kottmann


Axpo's grid operates an interconnected, cross-regional transmission grid that has been undergoing a gradual conversion from 50 to 110 kV since the 1980s. Around 60% of the grid is now operating at 110 kV. Investment planning, and thus also the point at which the entire grid will be able to operate at 110 kV, has been continuously optimised since the voltage conversion began based on the actual increase in load and the need for upgrades. The conversion is due to be completed in 2025. Due to the economic slowdown and anticipated stagnation in peak load from 2025 onwards, optimisations are being made on an ongoing basis, including the decision not to use transformers or individual lengths of cable during the voltage conversion as against the original target grid plan.

The federal government's efforts as regards funding of renewable energies in Switzerland will also have an impact on the requirements placed on the cross-regional transmission network in the medium term. In order to further optimise the grid and define well-balanced upgrade strategies that can systematically reconcile the two opposing objectives of achieving "maximum possible security of supply" and "the lowest possible cost", we have developed our own methodology that takes into account the current and future load flow, the grid topology and the state of the operating resources. This new approach allows for integrated planning of grids and upgrades, which grid operators usually manage separately. This methodology will help Axpo's grid to systematically evaluate potential courses of action according to region and with differentiated development of renewable energies, as well as enabling needs-based investment planning.

Jörg Kottmann received his doctorate in physics from ETH Zurich and completed his postgraduate degree in Industrial Management at the same institution. From 2001-2006, he held multiple positions, including Head of Middle Office, at Atel. Since 2006, he is with Axpo Power AG. From 2006 – 2012, he was CEO of NOK Grid and Overall Project Manager of Axpo Power AG for the transfer of the transmission to Swissgrid and from 2009 – 2012, he was Head of Strategic Asset Management. Since 2012, he is Head of Asset Management.


16:45 – 17:00

Closing Remarks / Discussion



Starting 17:00

Networking Apero





Integration of Uncertainty into Planning and Operation of Electric Power Grids