| 摘要 |
PURPOSE: A current control device of an inverter is provided to reduce harmonic generation of inverter output current by extracting leading harmonic voltage as much as a digital delay with D-Q conversion, a low pass filter, and rotation conversion and utilizing as system voltage. CONSTITUTION: A first detection part(110) detects D-axis voltage and Q-axis voltage of DC components. A first rotary converter of a second detection part(120) converts the three phase voltage of a system into the D-axis voltage and the Q-axis voltage. The first rotary converter rotates and converts the converted D-axis voltage and Q-axis voltage according to the frequency of the system voltage and outputs a first D-axis voltage and a first Q-axis voltage. A low pass filter removes a harmonic signal from the first D-axis voltage and the first Q-axis voltage and outputs a second D-axis voltage and a second Q-axis voltage. An adder adds output signals of D-Q conversion, the rotary converter, and the low pass filter. The second rotary converter detects third D-axis voltage and third Q-axis voltage. A D-axis current controller detects D-axis system voltage. The D-axis current controller generates D-axis driving voltage. A Q-axis current controller detects q-axis driving voltage. The Q-axis current controller generates the q-axis driving voltage supplied to a load. [Reference numerals] (AA) d-q transformation & rotation transformation; (BB,EE,GG) Rotation transformation (e^(&thgr;wt)i ); (CC) Rotation transformation (e^(-&thgr;)i ); (DD) Rotation transformation (e^(-&thgr;wt)i ); (FF) Rotation transformation (e^(-&thgr;)i ) |
