Electric Power Systems
The section Electric Power Systems offers research expertise within three main areas, namely in the fields of Electric Power Systems, High Voltage Technology and in Electromagnetic Compatibility (EMC).
Electric Power Systems
This topic covers the main part of the research and educational work in the section. The research focus in this area is the future energy system, with an intelligent control of renewable dispersed fluctuating power sources and energy storages together with demand side response;
- integration of large offshore wind farms to the network grid
- islanding of small distribution networks
- stability and reliability of the power system and power quality issues including harmonic transmission of currents and voltages and interruptions due to faults
- relay protection and compensating units, network planning
- replacement of transmission overhead lines to underground cables
High Voltage Technology
Concerning High Voltage Technology, the section is working with modeling of discharge phenomena, modeling of electrical breakdowns in gasses, models for corona and flashover, high voltage components and diagnostic methods for transformers and generators. Furthermore, the section focuses on insulation and partial discharge problems, including lightning protection.
In the field of Electromagnetic Compatibility, the work is concentrated on conducted interference and over voltage protection. The section has well-equipped laboratories at its disposal.
The research mission for all the section’s topics is to secure and optimise the power system reliability and to ensure that the power quality follows the current standards and demands at all times. Due to this mission the section currently participates in the following research programmes:
Examples of research projects within the field of Electric Power Systems are:
- Harmonics and Interharmonics in a Transmission Power System
- Transmission Overhead Line Audible Noise
- Stability and Control of Wind Farms in Power Systems
The section is in charge of four well-equipped laboratories. The power system laboratory includes models of distributions systems including renewable energy supply units and storage facilities. Furthermore, the laboratory has testing facilities for relay protection units and a lot of simulation software available for analyzing the power systems.
A new RTDS (real time digital simulator) laboratory is just established, where power system electromagnetic simulations in real time can be performed. So far only 1 cubicle of RTDS is installed with 1 rack and 1 set of Giga Transceiver I/O cards (GTIO) inside, but more are to be established in 2010 in order to be able to simulate larger power systems.
The high voltage laboratory contains HV test equipment for student use, possibilities for partial discharge, tan δ and dielectric response measurements and an 800 kV Haefely impulse voltage generator.
Finally, the EMC laboratory has a maximum test voltage of 6kV, a pulse generator and a burst generator with belonging coupling filters used for examinations of the protection level of different equipment. For the testing of interference a radio frequency shielded enclosure can be used.
A more detailed description of the laboratory facilities may be found here: Power System Laboratory, High Voltage Laboratory, RTDS Laboratory and EMC Laboratory.