| 摘要 |
PURPOSE:To suppress distortion of voltage due to disturbance component by detecting control error of output current for each phase of a power converter such as a voltage type inverter and correcting voltage command value for each phase. CONSTITUTION:A current regulator 401 outputs voltage command values vd*, vq* so that d-axis current id and q-axis current iq will be equal for two axes current component commands id*, iq*. These command values are then converted through a vector rotary unit 402 into voltage command values on a rotary coordinates. On the other hand, LPFs 101, 102 constituting a theoretical current value calculation model 110 and the circuitry connected therewith constitutes a current control system model for calculating the estimated value of phase current. Upon occurrence of voltage distortion, an error occurs between the estimated value and an actual value of phase current, the error is then amplified through amplifiers 1061-106m and added to the voltage command value for the purpose of compensation. |
