CONTROL METHOD OF THREE-PHASE PWM INVERTER EQUIPPED WITH LC FILTER, AND INVERTER DEVICE OPERATING ACCORDING TO THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a control method of a three-phase PWM inverter equipped with an LC film that can be adapted even to an unbalanced load while being simple in structure, and can expand the range of an output voltage, and an inverter device that operates according to the method.;SOLUTION: The control method controls the three-phase PWM inverter composed of a DC power supply, a three-phase voltage type inverter, an AC LC filter and a driven load, independently controls inverter output voltages of two phases among the three phases following a preset arbitrary control side, and controls a remaining one-phase inverter output voltage by depending on and using the two-phase inverter outputs. Furthermore, an adjustment value d is imparted and adjusted so that standardization inputs, u_u, u_v and u_w to u, v and w phases of the three-phase voltage type inverter satisfy an expression of -1≤u_j'=u_j-d≤1(j=u, v, w), a command value to each phase u, v, and w is appropriately shifted to the same levels, and the range of the output voltage is expanded, thus enabling the control to be performed.;COPYRIGHT: (C)2007,JPO&INPIT