COMSOL Day: Electrical Power Systems
See what is possible with multiphysics simulation
Power distribution infrastructure and the grid have been brought into focus lately due to recent catastrophic climate events. COMSOL Day: Electrical Power Systems is an online event focused on these issues, where invited speakers and COMSOL staff will introduce you to and delve into the aspects of simulating such.
Apart from looking at the challenges facing us as we deal with a world with increasingly hostile environmental conditions, the sessions will focus on modeling techniques for applications and components such as coils, inductive heating, electric motors and generators, transformers, and cables.
The production and use of electrical power energy from renewable sources, whether replacing existing or through new, decentralized networks and infrastructures, pose major challenges for the electrical power industry. New concepts and designs have been identified and are being developed.
Helping in this highly charged and competitive race is the application of multiphysics simulations, which provide cost-effective development of new networks and component designs as well as insight into the retrofitting and optimizing of existing ones. Further, simulation is being applied on an increasing scale.
Despite faster, more powerful, and highly accurate computers and simulation software, there is a development bottleneck — typically not in the modeling capabilities of the engineers applying such but in outdated staffing structure and role deployment of the remaining engineers in this industry. Simulation could help much more if model development and use did not have to be managed and run entirely by a small group of simulation experts in an organization participating in this industry.
Therefore, the trend is increasing to actively involve colleagues and customers in the simulation process by providing them with specialized, ready-made simulation apps specific to a certain development task or application area. Learn more about this new trend in this session.
The quality of transformers is characterized by effects covering a wide range of physics: electromagnetic efficiency, electric and magnetic losses, stray fields, heating, and even noise emission. Discover how multiphysics simulation can help you predict the performance of transformers.
Generating a mesh that is both fine enough to capture the physical phenomenon and give accurate results and computationally efficient is a compromise and requires different meshing techniques. During this Tech Café, we will discuss how best to generate meshes for typical situations encountered in low-frequency EM models, including boundary layer meshes, infinite elements, rotating domains, and thin layers.
Cristina Pais, Siemens Energy, Germany
With the increase in the complexity of distributions transformers, FEM simulations became a requirement in the prototyping phase. During this talk, we will show how the design of distribution transformers can be improved to meet customer needs and avoid design failures. Magnetic and thermal simulations are very important to evaluate the temperature distribution in the windings, as well as to calculate the increase of losses and short-circuit impedance due to the external busbars connected to the transformer.
Learn the fundamental workflow of COMSOL Multiphysics®. This introductory demonstration will show you all of the key modeling steps, including geometry creation, setting up physics, meshing, solving, and postprocessing.
In this session, we will discuss the details of modeling electrical machines and different multiphysics aspects using COMSOL Multiphysics®. We will show you how to model different types of electric motors, such as induction motors, permanent magnet motors, LVDT, generators, electromagnetic switches, magnetic pumps, and magnetic valves. We will discuss how to compute winding and core losses for thermal analysis in order to address the multiphysics aspects of these machines. You will also see how electromagnetic forces can be coupled with different physics, such as structural mechanics and acoustics.
Power lines form a major part of the power grid. Modeling these assets and associated components can be used for corona discharge prevention, optimization, and more. In this Tech Café, we will discuss simulation techniques, such as the hybrid FEM–BEM approach, to make the electrical analysis of power transmission lines more efficient.
Dr. Ahmed Akram Mirza, Hitachi Energy
Air core magnetic reactors play a crucial role in the performance of high-voltage direct current (HVDC) systems. These reactors are used at both distribution and transmission voltages for a variety of applications, such as fault current limiting, power flow control, reactive compensation, and as the inductive part of the tuned harmonic filters. Air core reactors produce a high degree of stray magnetic fields due to the fact that they do not contain any core to constrain them (the magnetic fields). These stray magnetic fields can induce large eddy currents in any metallic equipment around, and closed loop currents can be formed in concrete reinforcement, fences, and earthing systems. The eddy currents can give rise to severe heating problems. Hence, it is important to position the air core reactors and surrounding metallic infrastructures to avoid heating. In this talk, we will show how COMSOL Multiphysics® is used to calculate magnetic fields and resulting temperature distribution. The benefit of taking a multiphysics approach will also be discussed.
As the future moves toward sustainable energy, the need for transferring electric power over long distances from areas of energy production, such as wind farms, is becoming more prevalent. High-voltage, direct current (HVDC) electric power transmission systems are becoming the solution for such within Europe and, increasingly so, in the U.S. Further, security and cost-saving requirements are also leading power grid companies and regulators to insist on HVDC investment, as opposed to overhead power lines.
HVDC uses direct current (DC) for the transmission of electrical power, which leads to about 50% of the losses per distance unit as the more common alternating current (AC) systems, but they still incur losses. Yet, due to the scales and the environments cables are run through, such as underground and oceans, losses can only be experimentally determined at great expense, which leads to huge potential for savings in virtual cable development.
This session will include an introduction to modeling capacitive, inductive, and thermal effects in industrial-scale cables, particularly HVDC. This will include techniques for efficiently analyzing 3D twisted cables and magnetic losses in the armor through examples and demonstrations.
Ferromagnetic materials are at the heart of motors, transformers, inductors, and many other electromagnetic devices. A challenge with simulating these applications and devices is to consider the variable and nonlinear properties of ferromagnetic materials, such as magnetic saturation, hysteresis, and anisotropy. Join us in this Tech Café to discuss and ask questions to COMSOL technical staff about techniques for modeling magnetic materials and phenomena, such as iron loss estimation, using Steinmetz or Bertotti loss models for fundamental frequency and harmonics, and explicit hysteresis modeling.
Robert Courant, Mechatronic Systems Lab
Magnetic problems almost always incorporate some material nonlinearities. While linear orthotropic or isotropic nonlinear material models are rather straightforward in COMSOL Multiphysics®, the combination of both phenomena is especially challenging. The most common application with both effects is grain-oriented electrical steel that shows a magnetic easy axis in the rolling direction and transverse magnetic hard axes. Based on the coenergy density, an elliptic model for the interpolation between the principal directions is derived. The extension of the model to laminated materials allows for the accurate depiction of typical core configurations in power systems without the need to geometrically model the thin sheets. The approach is numerically validated by comparing the homogenized laminated material with the geometrically modeled laminate.
COMSOL Multiphysics® version 6.0 is coming soon! This session will touch upon the highlights of the new release:
- Model Manager: Major new functionality that allows colleagues to collaborate and centrally organize models and apps, including access and version control as well as advanced search
- Uncertainty Quantification Module: A new product that includes tools for uncertainty quantification, including design of experiments
- Improved printed circuit board (PCB) import and computation of parasitic inductances of PCBs in the frequency domain
- Frequency domain support for the Magnetic Fields, Currents Only interface
- New Magnetomechanics interface
Managing Director, Germany
Technical Marketing Manager
Technical Product Manager, AC/DC Module
Technical Support Manager
Technology Director, Electromagnetics
Senior Applications Engineer
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