FIELD: reactive-power correction for three-phase, abruptly varying industrial loads, such as steel-smelting arc furnaces. SUBSTANCE: static thyristor compensators have three independent line reactors star-connected to three-phase mains, each through pair of thyristors connected in parallel opposition to respective pulse-phase control system. Phase position of thyristor control, pulse for respective delta-connection phase of thyristor-reactor group depends not only on reactive power desired at the moment from particular phase of reactive power but also on delta-connection phase power leading this phase by 60 el.deg. Leading phase power can be schematically and physically included by inserting adders of desired power of particular phase of reactor delta connection and leading phase power increment within period from its connection to moment of shaping control pulse of particular phase between independent calculators of current values of desired reactive power and pulse-phase control system. EFFECT: improved accuracy and response to changes in reactive power of load in line conductors of supply mains. 3 dwg
