DEVICE FOR DECREASING CURRENT ERROR OF THYRISTOR REGULATOR OF REACTIVE POWER

摘要

FIELD: electric engineering. SUBSTANCE: device has feedback unit which is inserted between current transformer in circuit of corresponding reactor and sign- inverting input of adder. Output of feedback circuit is connected to second input of second adder through integrator. Second adder is inserted between input terminal of decreasing unit and device for phase-pulse control of corresponding thyristor gate. Single-period rectifier is user as feedback unit. Function generator is inserted between input terminal of decreasing unit and direct input of first adder. Said generator provides correspondence between input signal of decreasing unit and average value of output current for given scale. Device may be used in arc steel furnaces which are controlled by static thyristor compensator using linear reactors which are connected to power supply lines through thyristor gates of alternating current with pulse-phase control devices. EFFECT: simplified design, increased stability when it operates as system with feedback circuit, increased dynamic precision.