| 摘要 |
PROBLEM TO BE SOLVED: To suppress the oscillation of an AC input current, etc. by possessing a limiter which limits the rate of voltage change on the output of a proportional controller, within a proportional-plus-integral controller, in a current type controller which has an LC filter on the side of AC input for pulse width modulation and converts AC into DC. SOLUTION: A proportional-plus-integral (PI) controller 92' is provided with a limiter 924 which limits the rate of change of output voltage of a proportional controller 921'. Now, in the case of constituting a high-speed Dc current control system of a conventional PI controller, it is usual to enlarge a proportional gain Kp as compared with an integral gain Ki, and the rate of change of a DC voltage command Vdc* is decided by the proportional system. Here, by the constitution of the proportional controller 921' where the limiter 924 is inserted and the limiter 924, even in case that the amount ΔIdc of change of the DC current Idc being a great current change is inputted, the rate of change of a DC voltage command Vdc*' can be limited to a certain value or under. |
