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Joint operation of the superconducting fault current limiter and magnetic energy storage system in an electric power network Abstract. An opportunity of using superconductors as active elements of electric power systems designed to control the electric power distribution, to enhance the systems operating modes and to limit fault currents, was very attractive for investigators for a long time. In this paper, is considered an opportunity to enhance the electric power systems with the aid of superconducting magnetic energy storage systems (SMES) and superconducting fault current limiters (SFCL) operating together. It has been shown that the joint operation of both these superconducting devices allows additional varying of their parameters, what in turn gives a further opportunity to reduce their mass and dimensions and consequently the costs. There had been also shown an additional advantage of the SMES and SFCL joint operation consisting in that they ensure a more effective protection for a power system, preventing its uncontrolled load-off and subsequent acceleration up to the inaccessible rotation speed. IntroductionAs it is known, the general enhancement of the electric power systems reliability means the increasing of their static and dynamic stability.The static stability is the system's ability to restore its initial operative mode after a low disturbance and/or to ensure a mode close to the initial one if the disturbance has not been eliminated.The dynamic stability of the electric power system is an ability to restore its initial (or close to the initial one) state after large scale disturbances. The latter are understood as short-circuits (shortenings), disconnection or, on the contrary, connection of any power system elements -loads, transformers, generators, electric power transmissions lines, etc. At the steady-state mode there is a balance between the generator electromagnetic torque and mechanical torque on its shaft. Rapid changes of the power system operating mode cause the change of the equivalent generator electromagnetic torque. The disbalance between the latter and turbine accelerating torque leads to undesirable acceleration of the generator rotor.Therefore, the main condition of the reliable power system operation consists in ensuring its stability. This paper considers a joint operation of the SFCL and SMES in order to ensure the power system dynamic stability.

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