Control manner and reactive power generator null of reactive power

摘要

PURPOSE:To reduce the DC voltage fluctuation by detecting the active current actual value of a power system and correcting a control signal in accordance with this detected active current actual value to quickly and stably attain a reactive current target value. CONSTITUTION:In the transient state, the active current flows between a power system 1 and self-excited voltage type inverter 2 when the output voltage is quickly changed. This active current actual value is calculated by an active current computing element 9 and is multiplied by a prescribed constant K, and the value of this product is applied to the control signal obtained from a reactive current controller 7 to correct this control signal. Since charging/ discharging of a DC smoothing capacitor 3 is suppressed by the value of the product applied to the control signal as the result, the voltage between both ends of the capacitor 3 is not very variable, and the variation of the output voltage of the inverter 2 is reduced. That is, such control is possible that a desired reactive current can be quickly obtained through the reactive current target value is quickly changed.