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Analysis of subsynchronous torsional interaction of HVDC system integrated hydro units with small generator-to-turbine inertia ratios


Choo, YC and Agalgaonkar, AP and Muttaqi, KM and Perera, S and Negnevitsky, M, Analysis of subsynchronous torsional interaction of HVDC system integrated hydro units with small generator-to-turbine inertia ratios, IEEE Transactions on Power Systems, 29, (3) Article 6689351. ISSN 0885-8950 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 IEEE

DOI: doi:10.1109/TPWRS.2013.2292857


The constant current controllers at high voltage direct current (HVDC) rectifier stations and the outer loops which set the reference to the current controller have potential to introduce negative damping on the nearby generating units. It is therefore vital to investigate the torsional interaction behavior between turbine-generator (TG) units and the HVDC systems over a frequency range of interest. In this paper, subsynchronous torsional interaction (SSTI) phenomenon for hydroelectric TG units with small generator-to-turbine inertia (GTI) ratios interconnected to an HVDC system has been investigated. The sensitivity of different system parameters, such as generating capacity and loading, DC power flow, AC network strength and current controller gains, towards electrical damping contribution is also examined. Hydro units with different shaft systems are examined for SSTI proneness by conducting perturbation analysis. The impact of hydroelectric TG units with different GTI ratios has also been examined by applying a three-phase to ground fault at the rectifier station. Simulation studies have been carried out in PSCAD /EMTDC environment. Due to lack of modal damping with relatively low decrement factor and logarithmic decrement, sustained and growing TG torque oscillations are noted for certain operating conditions of hydro units with small GTI ratios interconnected with an HVDC system..

Item Details

Item Type:Refereed Article
Keywords:damping torque analysis, high voltage direct current (HVDC), hydroelectric turbine-generator, perturbation analysis, subsynchronous torsional interaction (SSTI)
Research Division:Engineering
Research Group:Electrical engineering
Research Field:Electrical energy generation (incl. renewables, excl. photovoltaics)
Objective Division:Energy
Objective Group:Energy storage, distribution and supply
Objective Field:Energy transmission and distribution (excl. hydrogen)
UTAS Author:Negnevitsky, M (Professor Michael Negnevitsky)
ID Code:97614
Year Published:2014
Web of Science® Times Cited:12
Deposited By:Engineering
Deposited On:2015-01-05
Last Modified:2017-11-06

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