| 摘要 |
PURPOSE: A thyristor controlled reactor (TCR) control apparatus for a static Var compensator is provided to improve power factor and stability of a system voltage by compensating reactive power which varies rapidly like an electric furnace. CONSTITUTION: A positive phase sequence current calculation unit (111) calculates a positive phase sequence reactive current by converting a load current of each phase into a value of DQ synchronous rotation coordinate system. A compensation current calculation unit (113) calculates a compensation current of each phase by using the positive phase sequence reactive current, a negative phase sequence active current and a negative phase sequence reactive current. A reactive current control unit (122) calculates a compensation value for reactive power of each phase by performing PI control of error of the line reactive power of each phase and a pre-established reference reactive power. A firing angle calculation unit (13) determines a firing angle of a TCR by using the compensation current of each phase calculated in an open loop control unit and the reactive power compensation value calculated in a closed loop control unit. [Reference numerals] (111) Positive phase sequence current calculation unit; (112) Negative phase sequence current calculation unit; (113) Compensation current calculation unit; (114) Phase detection unit; (115) Susceptance conduction angle calculation unit; (121) Reactive power calculation unit; (122) Reactive power control unit; (13) Firing angle calculation unit |
