METHOD FOR CONTROLLING SINUSOIDAL VOLTAGE OF INVERTER OUTPUT

摘要

PURPOSE: A method for controlling sinusoidal voltage of inverter output is provided to maintain a clear sinusoidal wave output even when a fluctuating load or distortion of voltage occurs in non-linear load. CONSTITUTION: Both ends of LC filter capacitor are set as an output controlling variable(S21). An inverter output current and a discrete state equation of a capacitor are produced(S22). The inverter output current making both ends of voltage of a capacitor zero is set as an imaginary controlling variable(S23). An error term showing an error between the imaginary controlling variable and actual inverter output current is defined(S24). An input controlling variable making the error term zero in the next sample is produced(S25). A corrected input controlling variable is produced by correcting an input controlling variable which makes the error term zero(S26).