Authors: U.A. Dementiev, Research and development center at Federal Grid Company of Unified Energy System, JSC, P.V. Sokur, Research and development center at Federal Grid Company of Unified Energy System, JSC, U.G. Shakarian, Research and development center at Federal Grid Company of Unified Energy System, JSC, A.V. Maiorov, Energokomplex, JSC, A.M. Shabash, Energokomplex, JSC, D.N. JAROSH,  Research and development center at Federal Grid Company of Unified Energy System, JSC, N.D. Pinchuk, Power Machines, PJSC, V.S. Tretiak, Power Machines, PJSC

Keywords: electromechanical AC link; short-circuit current; electrical machine.

Abstract: The dense energy system of any metropolitan city is characterized by a considerable energy consumption, high generating capacities and relatively short power transmission lines of 110–500 kV voltage ratings. Both international and Russian practices confi rm that the energy consumption in metropolitan cities tends to a sustainable growth. As a result, short-circuit current (SCC) levels in 110/220 kV metropolitan grids exceed 63 kA which is more than the maximum breaking current of industry-standard circuit breakers.

The features of metropolises power grid are high short-circuit currents, which are also a deterrent to the development of the power grid. Complex grid confi guration imposes restrictions on the flexibility of the operating mode of the power system. The application of an electromechanical AC link allows to limit the growth of the short-circuit current when combining the open sections of the grid, to regulate the reactive power (voltage) within wide limits, to control the active power fl ows through a link.

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