Patent ID: 6680602
Filing Date: 2004-01-20
Classification: H02J,Y02E

Abstract:
A reactive power compensator comprising:a computing unit, connected to an output side of a voltage regulator connected to a power system in which every time a voltage to be supplied to a load connected to the output side deviates from a dead zone having boundary voltages above and below a predetermined reference value, the voltage is regulated to be one of a plurality of predetermined discrete values, each value being different by a predetermined amount, and calculating an electric current by multiplying a difference between the voltage to be supplied the load and the reference value by a gain calculated based on the boundary voltages or the predetermined discrete value, wherein the electric current calculated is input to and output from the power system, the gain includes at least two stages of gains comprising a first gain when the voltage of the system is within the dead zone or outside the dead zone and near one of the boundary voltages, and a second gain when the voltage of the system is outside the dead zone and not near the boundary voltages, the second gain being larger than the first gain and smaller than twenty times the first gain.