Publication information IEEE Transactions on Power Systems, 32 (3) : [1927][1928][1929][1930][1931][1932][1933][1934][1935] Publisher IEEE Item record/more information http://hdl.handle.net/10197/7987 Publisher's statement Abstract-Renewables are increasingly replacing power from conventional generators. Renewable power injected through power electronic converters lacks the fundamental electric torque components. Electric torque components have an important role in determining the behavior of

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... nventional machines in the network. The influence of this factor becomes more notable in power systems with reduced inertia. Hence, questions arise on, how can synchronizing torque basically contribute to the rotor speed deviation and eventually the system frequency and if there is a potential for using the steady state synchronizing torque coefficient (STC) to achieve acceptable frequency operating points. This paper calculates the steady state STC matrix by using the multi-machine Heffron-Philips model in conjunction with the network admitance matrix. Accordingly, it investigates the impact of the generator location and reactive power output on the STC matrix. It demonstrates how this impact manifests in the generator rotor speed deviation. Eventually, the significance of the STC from the system frequency perspective is assessed. Index Terms-operation, frequency, reactive power, synchronizing torque, wind generation, rate of change of frequency Mostafa Bakhtvar (S'12) received his Ph.D. in electrical engineering and M.E. in energy systems engineering from University College Dublin, Ireland, in 2016 and 2012, respectively; he completed the B.Sc. degree in electric-power engineering at IAU-Saveh, Iran, in 2010. He is currently a senior researcher with the School of Electrical and Electronic Engineering, University College Dublin. His research interests include, distribution and transmission system planning, operation, optimization and stability.