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SEMINAR: SUBSYNCHRONOUS

RESONANCE, SSRIntroduction

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2016-11-24, Per Lamell, F-0038127

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SAFETY FIRST

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Please note where the nearest emergency exits, fire extinguishers, gathering place and defibrillators are.

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BACKGROUND TO SEMINAR Strategy plan: GINO (Grid interference on nuclear power

plant operations) Expected deliverables

- Describe phenomenon and what technical information is needed to do SSR calculations

Focus area C: Electromechanical resonance phenomena in external grid

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PROGRAM 10.00 Subsynchronous resonance and Torsional interaction - Background and Physical

understanding, Kenneth Walve

10.30 SSR analysis and design of SSR protection in Sweden, Per-Olof Lindström, Svenska Kraftnät

11.15 Experiences from SSTI-studies in HVDC projects, Adil Abdalrahman, ABB Power Grids, HVDC

12.00 Lunch

13.00 TCSC Introduction and its capability on SSR Mitigation, Hector Latorre, ABB

13.45 SSR Introduction and theoretical SSR amplitudes, Stefan Roxenborg, ABB

14.00 SSR field observations, Tord Bengtsson, ABB

14.30 Design of numerical SSR protections and conclusions, Zoran Gajic, ABB

14.55 Coffee

15.10 Experience from the Swedish TSO in running the new protection, Per-Olof Lindström, Svk

15.30 Experience from the Finnish TSO, Tuomas Rauhala, Fingrid Oyj

16.00 Discussion (16.30 End of seminar)4

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SSO AND SSR DEFINITIONS According to IEEE Sub synchronous Resonance WG of the System Dynamics Performance Subcommittee, June 1985.

Turbine-generator electromechanical interaction with series capacitors has historically been known as the phenomena of Sub synchronous Resonance (SSR).

Sub synchronous Oscillations (SSO) are electromechanical interaction, either between a turbine-generator and passive system elements such as series capacitors, or between a turbine-generator and active system elements such as HVDC transmission equipment controls, and static VAR system controls.

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SUBSYNCHRONOUSRESONANCE J.W. Butler and C. Concordia, "Analysis of

Series Capacitor Application Problems," IEEE Transactions, Vol.56, 1937, pp.975-988.

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SHAFT FAILURE Occurs mainly in series capacitor compensated

transmission systems

First experienced in 1970 resulting in shaft failure of units at Mohave Plant in Southern California

Not until the second failure in 1971 was the real cause of failure recognized as SSR

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ORIGINAL F3 SSR PROTECTION AND TME

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F3

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NATURAL TORSIONAL FREQUENCIES

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F12 NTF AND NETWORK DAMPING - LP

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F3 NTF AND NETWORK DAMPING -LP

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THANKS!

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