| 摘要 |
PURPOSE: To enhance a transient characteristic by inputting the d.c. component of cos and sin components of a compensation object current, adding the compensating cos and sin components by multiplication of two-phase sine wave voltages, doubling it and inverting its sign. CONSTITUTION: A compensating frequency voltage generator 31 outputs two- phase sine wave voltages (SV) ea, eb which have 90 deg. different phases to each other. A multiplier 411 in which the compensating object current IL and two- phase sine wave voltages ea, eb are inputted and computed outputs a cos component (p) and a sin component (q). A low-pass filter 51 removes a fluctuating value in which the COS component (p) and the sin component (q) are inputted to output the d.c. component p*, q* of the sin component (q). A multiplier 421 in which two-phase sine wave voltages ea, eb and the d.c. components p*, q* are inputted, outputs a compensating cos component ip* and a compensating sin component iq by computation. An adder 6 in which the compensating cos component ip* and the compensating component iq* are inputted, added and doubled, determines a compensating object harmonic current in and inserts a sign, thereby outputting a compensating command ic*. |
