| 摘要 |
FIELD: electricity. ^ SUBSTANCE: proposed invention relates to electrical engineering, in particular, to electrical distribution equipment, and serves for compensation of reactive power in automatic mode under alternating load conditions. A plant comprises an input three-phase four-wire bus (1) for connection to a source of supply, an output three-phase bus (2) for load connection, three current transformers (3), a reactive power controller (4), K control stages (5), comprising three bidirectional keys (6) and three capacitors (7) each, a charging-discharging device (8) with a function of compensation of capacitor leakage currents. Control signals for connection of appropriate keys are sent at the moments, when linear voltage, to which a specific capacitor (7) connects, reaches an amplitude value, at the same time difference of potentials on the key (6) at the moment of connection is close to zero. Disconnection of the specific capacitor (7) also takes place at the moment when linear voltage, to which a specific capacitor connects, reaches an amplitude value, at the same time current flowing through the key (6) is close to zero. The described logic of switching capacitors (7) with keys (6) makes it possible to minimise switching surges of currents and voltages. ^ EFFECT: increased range of compensated reactive power. ^ 1 dwg |
