| 摘要 |
PURPOSE:To accurately set and control the received voltage at a set reference voltage level by using a reactive power adjusting device to increase or decrease smoothly the lagging reactive power. CONSTITUTION:A comparison arithmetic unit 10 compares the voltage V1 given from a transformer PT of a lagging reactive power adjusting device 6 with the reference voltage V0 to be set and outputs an error V=V1-V0. While a controller 11 receives the input of the output error voltage V from the unit 10 and gives the ON/OFF control to those switches Sw1-Swn, Sw1'-Swn', S1-Sn, S1'-Sn' and S0 so that the electric signal V is equal to 0. At the same time, the controller 11 drives the rotor of the controller 6 via a driver 12 to control it. Then the control is carried out to apply the reactive power when the error voltage V given from the unit 10 is plus. While the leading reactive power is applied when the voltage V is minus. Thus the error voltage become zero.
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