Patent RU-2306661-C1 (RU)
Title: Voltage stabilizer
Inventor: ROZANOV JURIJ KONSTANTINOVICH
IPC: H02M5/44
Filed: 2006-03-21
Granted: 2007-09-20
Abstract: FIELD: electric engineering. 
     SUBSTANCE: stabilizer contains parallel active filter (1), from controlled bridge transformer of constant current to alternating current (2), on the constant current side of which in parallel to first and second inputs, accumulating capacitor (3) and voltage sensor (4) are coupled. To the output of transformer (2) an LC-filter is serially connected in form of throttle (5) and capacitor (6), to common connection point of which the first input of current sensor (7) of filter (1) is connected. First output of additional transformer (8) is connected to one of the outputs of throttle (9), another clamp of which is connected to one of the clamps of primary winding of transformer 10, another clamp of which is connected to second output of transformer (8). Additional capacitor (11) is coupled in parallel to primary winding of transformer (10), while one of its armatures is connected to second output of transformer (8), and another one is connected to common connection point of throttle (9) and secondary transformer winding (10). First and second inputs of transformer (8) and transformer (2) are serially connected. One of force clamps of first contactor (12) is connected to connection point of one of clamps of secondary winding of transformer (10) and first input of network current sensor (13), and another force clamp of contactor (12) is connected to connection point of another clamp of secondary winding of transformer (10) and one of force clamps of second contactor (14), another clamp of which is connected to third input of input voltage sensor (15), connected in parallel to input clamps of voltage stabilizer. One of force clamps of third contactor (16) is connected to phase clamp of voltage stabilizer, and another one is connected to connection point of first input of output current sensor (17) and third input of output voltage sensor (18), second input of which, in combination with second output of transformer (2), is connected to zero clamp of stabilizer. One of force clamps of fourth contactor (19) is connected to connection point of one of clamps of charge resistor (20) and second input of current sensor (7) of filter (1), while another force clamp of fourth contactor (19) is connected to connection point of another clamp of charge resistor (20), second output of sensor (13) and third output of sensor (17). First inputs of sensors (15) and (18), second input of output sensor (17), third inputs of sensors (7) of filter (1), of sensors (13) and (4) are combined are connected to input of block (21). Control clamps of all four contactors are combined and connected to third output of block (21), first and second outputs of which are connected to third inputs of transformers (2) and (8) respectively. At the initial time moment, block (21) sends a signal to control input of first (12) and second (14) contactors, as a result of which their closure occurs (third (16) and fourth (19) contactors are open), while current flows from the network through second (14), first (12) contactors, resistor (20), throttle (5), transformer (2) and capacitor (3). Capacitor (3) is charged up to voltage, value of which equals the amplitude of network voltage. 
     EFFECT: decreased power of stabilizer, ensured filtration of high network voltage harmonics, with simultaneous filtration of high harmonic currents and with compensation of reactive power of the ones entering the network. 
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