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Step time response evaluation of different synchronous generator excitation systems
Univ Coll Southeast Norway, Dept Engn, Fac Technol & Maritime Sci, Bone, Norway. (Hydro Power)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Hydro Power)
2016 (English)In: Step time response evaluation of different synchronous generator excitation systems, IEEE Xplore, 2016Conference paper, Published paper (Refereed)
Abstract [en]

A fast step response of an excitation system is critical for a synchronous generator in order to maintain stability under disturbances in the interconnected power grid. This is the main reason that the static excitation system has been preferred for large synchronous generators. Some transmission system operators even have requirements that the excitation system should be static for synchronous generators above a certain size. The requirement is set in order to fulfill a certain goal for the step time response. As technology progresses forward, the static excitation system will not any longer be the only option for a fast controllable excitation system. New brushless rotating excitation systems, with wireless control interfaces, can be even faster than the static excitation system. They also reduce the need of maintenance of the synchronous generator. With permanent magnet exciters, the excitation system can be independent from the grid, maintaining the excitation response under voltage dips in the power grid. This paper evaluates the dynamic performance of the static excitation system compared with different types of brushless rotating excitation systems.

Place, publisher, year, edition, pages
IEEE Xplore, 2016.
Keyword [en]
synchronous generator modelling
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-292792DOI: 10.1109/ENERGYCON.2016.7513956ISI: 000390822900086ISBN: 9781467384636 (print)OAI: oai:DiVA.org:uu-292792DiVA: diva2:926651
Conference
IEEE International Energy Conference 2016 (ENERGYCON'16)
Available from: 2016-05-09 Created: 2016-05-09 Last updated: 2017-03-17Bibliographically approved
In thesis
1. Fast-response rotating brushless exciters for improved stability of synchronous generators
Open this publication in new window or tab >>Fast-response rotating brushless exciters for improved stability of synchronous generators
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The Norwegian Network Code FIKS from the Norwegian Transmission System Operator (TSO) Statnett, states that synchronous generators ≥ 25 MVA must have a static excitation system. It also includes requirements on the step time response and the available field winding ceiling voltage of the excitation system. An improved brushless excitation system is in operation in some pilot power plants. A rotating thyristor bridge is controlled via Bluetooth. The step time response is as fast as conventional static excitation systems. However, a ceiling voltage factor of 2 requires the thyristor bridge to operate at firing angles about 60 degrees. High torque pulsations, low power factor and low utilization of the exciter is the end result. New power electronic interfaces on the shaft results in a betterutilization of the designed exciter and improves the mechanical performance as well as the controllability of the generator field winding. Permanent magnet rotating exciters increase the field forcing strength of the synchronous generator, yielding improved transient stability (Fault Ride-Through req.). Brushless exciters also reduces regular maintenance of the generator. The thesis includes experiments on a state of the art synchronous generator test setup including constructed PM exciter and different power electronic solutions. Some investigations has been done on industrial power plants as well.

Place, publisher, year, edition, pages
Uppsala: Institutionen för teknikvetenskaper, 2016
Series
UURIE / Uppsala University, Department of Engineering Sciences, ISSN 0349-8352 ; 347-16L
Keyword
synchronous generators, permanent magnet machines, excitation systems, power electronic interfaces
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-292835 (URN)
Presentation
2016-06-13, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2016-07-07 Created: 2016-05-09 Last updated: 2016-07-07Bibliographically approved
2. A New Paradigm for Large Brushless Hydrogenerators: Advantages Beyond the Static System
Open this publication in new window or tab >>A New Paradigm for Large Brushless Hydrogenerators: Advantages Beyond the Static System
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The grid code, FIKS, from the Norwegian transmission system operator (TSO), Statnett, states that synchronous generators > 25MVA, must have a static excitation system. However, an improved brushless excitation system is in operation on some commercial power plants (36MVA, 93.75rpm & 52MVA, 166.67rpm) with grid-assisting performance beyond the conventional static system. The convenional diode bridge is replaced with a remote-controlled thyristor bridge on the shaft. If wireless communication is not allowed, a control signal through brushes should be employed instead. The thesis explores the expected new era for large brushless hydrogenerators. The proposed brushless system have benefits of reduced regular maintenance due to elimination of brushes and reduced unscheduled maintenance due to redundancy; causing a redused cost-of-energy. A six-phase exciter design with a hybrid-mode thyristor bridge interface leads to improved fault-tolerance, better controllability, minimized torque pulsations and reduced armature currents of the exciter. Excitation boosting (EB) capability is included in the brushless system without additional components or circuitry, contrary to the static excitation system. The brushless excitation system is made insensitive to voltage dips in the interconnected grid, causing improved fault ride-through (FRT) capability and power system stabilizer (PSS) actions. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. 93 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1491
Keyword
Brushless exciters, Rotating exciters, Permanent Magnet Machines, Synchronous Generator Excitation, Thyristor Rectifiers, Chopper Rectifiers
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-317780 (URN)978-91-554-9859-7 (ISBN)
Public defence
2017-05-10, Häggsalen, Ångströmlaboratoriet, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2017-04-19 Created: 2017-03-17 Last updated: 2017-04-19

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