METHOD FOR DETERMINATION OF SYNCHRONOUS OSCILLATIONS SOURCE Russian patent published in 2014 - IPC H02J3/38 

FIELD: electricity.

SUBSTANCE: scope of application - in systems for estimation of correct functioning for automatic excitation controllers (AEC) and excitation systems (ES) of the power plant generators. A criterion for determination of synchronous oscillations source is a phase shift value of reactive power Q_g and the current value of the generator voltage U_g. When fluctuations of the generator reactive power and voltage are in-phase or the fluctuations of the generator reactive power are in advance of the fluctuations of the generator voltage per a value within the range of the preset value, then the identified generator is the source of synchronous oscillations. The generator being the source of oscillations between generators at the same power plant is identified against the minimum difference in fluctuation phases of reactive power or voltage.

EFFECT: identification of the source of electromechanical oscillations within the range of frequencies in the range from one decimal point up to several hertz, that is determination of the generator with AEC, which incorrect or ineffective tuning of stabilisation channels (in case of the voltage regulator and power system stabiliser) or its failure (in case of AEC of proportional type) is the reason of their occurrence or development.

2 cl, 3 dwg