| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a harmonic component generated when a DC load having a rectifier is connected.SOLUTION: An inverter controller 1 comprises: means 101, 102 for detecting an input current value, an output current value, and an output voltage value of an AC filter 20; means 103 for applying three phase-to-two phase conversion and rotation coordinate conversion to the input current value, the output current value, and the output voltage value; means 107 for calculating a first value derived by multiplying a difference between the rotation coordinate-converted input current value and an input current reference value by a gain, and a second value derived by multiplying a differential value of the rotation coordinate-converted output current value by a gain; and means 109 for calculating a third value and a fourth value derived by delaying the first value and the second value so that these values lag in phase by 60° relative to the output voltage waveform. A value derived by adding the third value and the fourth value to the sum of a value which is feedback-controlled so that an error between the rotation coordinate-converted output current value and the output voltage reference value is converted to three-phase AC, which is then made to be an output voltage command value for an inverter 10.</p> |
