METHOD TO MONITOR STABILITY MARGINS OF MODE OF SYNCHRONOUS ELECTRIC MACHINES CONNECTED TO ELECTRIC NETWORK Russian patent published in 2013 - IPC H02H7/00 H02H7/06 H02H9/00 H02H11/00 

FIELD: electricity.

SUBSTANCE: in the method to monitor stability margins, modules and phases of voltages are measured in a synchronised manner on buses of synchronous machines, active or reactive powers released or consumed by synchronous machines under naturally or artificially created variances of their mode of operation. Using values of voltages on buses of power plants and released active and reactive powers, available internal resistances of synchronous machines, they calculate EMF values and angles of synchronous machine rotors, a system of equations is made for stabilised modes of operation of synchronous machines, which connect internal and mutual conductivities of EMF of synchronous machines with measured released powers, a system of equations is made for the stabilised mode of synchronous machines, modes are calculated for the stabilised mode of synchronous machines, a limit is fixed on stability, and the produced limits are used to calculate margins and limit capacity of synchronous machines.

EFFECT: increased reliability and validity of detection of synchronous machine mode stability margins.

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