METHOD DETERMINING SHARES OF LOAD AND POWER SYSTEM IN CHANGE OF QUALITY OF VOLTAGE Russian patent published in 2002 - IPC

FIELD: electric measurement technology, control over electric energy in power systems. SUBSTANCE: while determining shares of load and power system in change of quality of voltage abnormal component of voltage U_a of unit of power system, abnormal component of resulting emf e_a, of power system, abnormal components of load currents i_1a,i_2a, are isolated at unit of power system. Salient feature of invention lies in that own shares of branch with resulting emf of power system is found by averaging the square of abnormal component of voltage for its duration and of branches with sources of load currents are found by averaging the squares of derivatives of abnormal components of these currents for the same period. Mutual shares in change of quality of voltage caused by interaction of pairs of branches with sources of load currents are determined separately at unit of power system by averaging product of derivatives of abnormal components of load currents for same period, mutual shares in change of quality of voltage caused by interaction of branch with source of emf with resulting current of load branches by averaging product of abnormal component of resulting emf with derivative of abnormal component of resulting load currents for same time period are determined at unit of power system. Then resulting change of quality of voltage is determined at unit of power system in correspondence with given formula. EFFECT: diminished error in determination of shares of load and power system in change of quality of voltage. 1 cl, 2 dwg