PHASE VOLTAGE IMBALANCE CORRECTOR Russian patent published in 2016 - IPC H02P9/00 H02P9/14 H02P9/30 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for control of voltage of three-phase AC generators of stand-alone sources of electric energy. Technical result is reduction of imbalance of phase voltages during operation at variable non-homogeneous asymmetrical load. Phase voltage imbalance corrector comprises three-phase alternating current generator (1) with system of automatic excitation control (2), load (3), variators (4-1, 4-2 and 4-3), voltage amplitude measuring devices (5-1, 5-2 and 5-3), master register (6), numeric comparator (7, 8 and 9), and logical elements (10…18), logic or elements (19, 20 and 21), START bus (22). Each variator (4-1, 4-2 and 4-3) comprises from first (23-1 at 23-N) electronic switches, first (24-1 at 24-N) resistors, resistance of resistor in i-th branch is determined by ratio R_i= R₁·2^1-i, where R₁ - resistance of resistor of first branch, logical elements (and 25 and 26) and reversible counter (27). Amplitude measuring devices (5-1, 5-2 and 5-3) have same structure, which includes instrument transformer (28), diode (29), analogue-to-digital converter (30), memory register (31), output register (32), numeric comparator (33), short pulse generators (34 and 35) and delay element (36), electronic switch (37). Circuit includes NAND logic element (38) and diodes (39, 40 and 41).

EFFECT: device with high accuracy ensures balance of load phase voltages.

1 cl, 2 dwg