METHOD OF FINDING AND LIQUIDATION OF ASYNC MODE IN ELECTRIC POWER BY AUTOMATIC CONTROL SYSTEM Russian patent published in 2008 - IPC H02H3/48 H02J3/24 

FIELD: electric engineering.

SUBSTANCE: method can be used in aids of anti-alarm automatics of electric-power system. According to method, full resistance Z , calculated from local information (current and voltage in unit to be controlled) due to reduction its angle for correcting angle. Correcting angle is found during process through relation of increased reactive and active components of full resistance. Resistance is fixed till electric center of oscillations by using reactive component of transformed resistance Z. Active component of transformed resistance, which component is multiplied by electric transmission current, allows finding voltage Um in center. On base of voltage Um, angle δ_m of electric transmission is calculated on base trigonometric transform. From specified range of modeled voltage, range of angles of electric transmission is fixed beyond limits of working mode, in which mode the calculated angle more precisely corresponds to real one and async mode is revealed. By using angle of electric transmission and its derivatives and by defining location of center of oscillations in relation to unit to be controlled, threat, moment and fact of arise of async mode is fixed to form optimal action of automatic system.

EFFECT: improved adaptation; higher stability.

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