Remotely controlled rotating exciters for faster voltage response and rotor motion control

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Project abstract

In some applications, rotating exciters are preferred since they require less maintenance and offer high reliability. However, the controllability they offer is limited due to the nature of the type of power electronics utilized. In this project, the aim is to utilize remotely controlled, rotating voltage source converters with on board real time controllers to overcome the impediments of current systems. Summary of Work:

A MOSFET based rotating voltage sourced converter with an on-board FPGA based rotating controller has been designed, constructed, installed and tested,

all components where able to withstand the rotation under normal operation. The communication to the rotating system was achieved via Bluetooth.

With this setup, very high controllability of the rotor field current is achieved. Therefore fast voltage response and motion control of the rotor are possible.

A thyristor controlled rotating box has been tested and put into operation. It performs well with the rotating exciter system and has capability to increase independence on the grid for providing energy to magnetize large synchronous machines. It is also more fault redundant than conventional three phase systems.

With the segmented rotor technology, by controlling the radial forces in the machine, magnetic balance is achieved. Further, radial forces can be created to positively affect the rotordynamic behaviour of the machines. These improvements translate in a reduction of the mechanical loads the machine and structure have to endure, resulting in increased robustness towards structural strength and fatigue, leading to reduced maintenance and increased machine lifetime.

With the current controlled field current, it has been demonstrated that by magnetizing the rotor in innovative ways, tangential forces can be influenced. The implication is that braking and accelerating torques can be created. Therefore, it is possible to start a synchronous machine and operate it asynchronously, utilizing power electronics on the rotor side, rather than using auxiliary motors, damper cages, or power electronics in the stator, which are usually considerably larger. In hydropower units, this can be utilized during start operations to accelerate the machine electrically rather than with water in order to spare the turbine from wear. With the elimination of damper bars, this technology increases the competitiveness of small and medium size synchronous machines in the high efficiency motor segment.

Summary of work

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Event log

MOSFET based, rotating voltage sourced converter prototype achieved.

Testing of the rotating voltage source converter, positive results from the testing.

Components for a larger IGBT based system identified.

2017 the thyristor controlled rotating box was fully tested

During spring 2017 a number of companies utilizing and producing large synchronous machines were visited to show our technologies.

Project reference-group

Johan Bladh,  Vattenfall
Mattias Nässelqvist,  Vattenfall

Publications by this researcher

See alternatively the researcher's full DiVA list of publications, with options for sorting.
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Simulation of Rapid Voltage Edge Related Voltage Surges in Highly Inductive Windings with Frequency Dependent Parameters
Roberto Felicetti,   Jesús J. Pérez-Loya,   Claes U. Lundin.
2023,   Progress in Electromagnetics Research B, vol. 99

Mitigation of Unbalanced Magnetic Pull in Synchronous Machines With Rotating Exciters
Fredrik Evestedt,   Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2021,   IEEE transactions on energy conversion, vol. 36(2)

Controlling airgap magnetic flux density harmonics in synchronous machines using field current injection
Fredrik Evestedt,   Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2021,   Electrical engineering (Berlin. Print), vol. 103

Start of a synchronous motor using rotor field polarity inversion and rotor back-emf sensing
Urban Lundin,   Fredrik Evestedt,   Johan Abrahamsson,   José Pérez,   Martin Fregelius,   Jonas Kristiansen Nøland.
2020,   International Conference on Electrical Machines, ICEM 2020, Online, Aug 23-26, 2020

Electromagnetic losses in synchronous machines during active compensation of unbalanced magnetic pull
Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2018,   IEEE transactions on industrial electronics (1982. Print), vol. 66(1)

Testing of Active Rectification Topologies on a Six-Phase Rotating Brushless Outer Pole PM Exciter
Jonas Kristiansen Nøland,   Fredrik Evestedt,   Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2018,   IEEE transactions on energy conversion, vol. 33(1)

Damper Winding Fault Analysis in Synchronous Machines
Subrat Sahoo,   Fredrik Holmgren,   Pedro Rodriguez,   José Pérez,   Urban Lundin.
2018,   13th International Conference on Electrical Machines (ICEM), Alexandroupoli, Greece, Sep 03-06, 2018

Magnetic thrust bearing for a 10 MW hydropower generator with a Kaplan turbine
Curt Johan David Abrahamsson,   Jesús José Pérez-Loya,   Martin Fregelius,   Fredrik Evestedt,   Johan Bladh,   Urban Lundin.
2018,   Hydro 2018, Oct 15 - Oct 17, Gdansk, Poland 2018

Comparison of Thyristor Rectifier Configurations for a Six-Phase Rotating Brushless Outer Pole PM Exciter
Jonas Kristiansen Nøland,   Fredrik Evestedt,   Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2018,   IEEE transactions on industrial electronics (1982. Print), vol. 65(2)

Demonstration of Synchronous Motor Start by Rotor Polarity Inversion
J. José Pérez-Loya,   C. Johan D. Abrahamsson,   Fredrik Evestedt,   Urban Lundin.
2018,   IEEE transactions on industrial electronics (1982. Print), vol. 65(10)

Demonstration of active compensation of unbalanced magnetic pull in synchronous machines
J. Jose Pérez-Loya,   C. Johan. D. Abrahamsson,   Urban Lundin.
2017,   CIGRE Science & Engineering, vol. 8

Synchronous machine and method for operating a synchronous machine
J. Jose Pérez-Loya,   C. Johan. D. Abrahamsson,   Urban Lundin.

Analysis and control of magnetic forces in synchronous machines
J. J. Pérez-Loya.
2017,   Thesis (PhD), Acta Universitatis Upsaliensis, Digital 1542

Eddy Currents in a Passive Magnetic Axial Thrust Bearing for a Flywheel Energy Storage System
Magnus Hedlund,   Johan Abrahamsson,   Jesús José Pérez-Loya,   Johan Lundin,   Hans Bernhoff.
2017,   International journal of applied electromagnetics and mechanics, vol. 54(3)

Magnetic thrust bearing for a hydropower unit with a Kaplan turbine
J. Jose Pérez-Loya,   Fredrik Evestedt,   Urban Lundin.

Performance tests of a permanent magnet thrust bearing for a hydropower synchronous generator test-rig
Jesús José Pérez-Loya,   Johan Abrahamsson,   Fredrik Evestedt,   Urban Lundin.
2017,   ACES Journal, vol. 32(8)

Design and Characterization of a Rotating Brushless Outer Pole PM Exciter for a Synchronous Generator
Jonas Kristiansen Nøland,   Fredrik Evestedt,   J. José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2017,   IEEE transactions on industry applications, vol. 53(3)

Arrangement and method for force compensation in electrical machines
J. J. Pérez-Loya,   C. J. D. Abrahamsson,   U. Lundin.

Fail-safe system for discharging a magnetic thrust bearing
J. J. Pérez-Loya,   C. J. D. Abrahamsson,   U. Lundin.

Arrangement for supporting a rotatable body
J. J. Pérez-Loya,   C. J. D. Abrahamsson,   U. Lundin.

Design and characterization of a rotating brushless PM exciter for a synchronous generator test setup
Jonas Kristiansen Nøland,   Fredrik Evestedt,   Jesus José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2016,   International Conference on Electrical Machines 2016 (ICEM'16), Lausanne, SWITZERLAND, SEP 04-07, 2016

Initial Performance Tests of a Permanent Magnet Thrust Bearing for a Hydropower Synchronous Generator Test-Rig
J. Jose Perez-Loya,   Johan Abrahamsson,   Fredrik Evestedt,   Urban Lundin.
2016,   AIM 2016

Simple Method to Calculate the Force between Thin Walled Solenoids
J. José Pérez-Loya,   Urban Lundin.
2016,   Progress In Electromagnetics Research M, vol. 51

Evaluation of different power electronic interfaces for control of a rotating brushless PM exciter
Jonas Kristiansen Nøland,   Fredrik Evestedt,   Jesús José Pérez-Loya,   Johan Abrahamsson,   Urban Lundin.
2016,   42nd annual conference of the IEEE Industrial Electronics Society, Florence, October 27-27, 2016

Analysis of passive magnetic bearings for kinetic energy storage systems
Elkin Rodriguez,   Juan de Santiago,   Jesus José Pérez-Loya,   Felipe S Costa,   Guilherme G Sotelo,   Janaina Goncalves de Oliveira,   Richard M Stephan.
2014,   14th International Symposium on Magnetic Bearings

Passive Magnetic Bearing System
Elkin Rodriguez,   Jesus José Pérez-Loya,   Juan de Santiago,   Felipe S Costa,   Guilherme G Sotelo,   Janaina Goncalves de Oliveira,   R. M. Stephan.
2014,   22nd International Conference on Magnetically Levitaded Systems and Linear Drives

Optimization of Force Between Cylindrical Permanent Magnets
J. Jose Perez-Loya,   Urban Lundin.
2014,   IEEE Magnetics Letters, vol. 5

Magnetic Modeling and Measurement of Forces Between Permanent Magnet Rings used as Passive Magnetic Bearings
Jesus José Pérez-Loya,   E. Rodriguez,   Magnus Hedlund,   R. M. Stephan,   Urban Lundin.
2013,   1st Brazilian Workshop on Magnetic Bearings, BWMB 2013

Construction of a Permanent Magnet Thrust Bearing for a Hydropower Generator Test Setup
Jesus José Pérez-Loya,   Juan de Santiago,   Urban Lundin.
2013,   1st Brazilian Workshop on Magnetic Bearings, BWMB 2013

Passive Axial Thrust Bearing for a Flywheel Energy Storage System
Magnus Hedlund,   Johan Abrahamsson,   Jesús José Pérez-Loya,   Johan Lundin,   Hans Bernhoff.
2013,   The 1st Brazilian Workshop on Magnetic Bearings

Publication list last updated from DiVA on 2024-01-10 15:23.

Page started: 2016-09-12
Last generated: 2024-01-10