Sampling methods for discontinuous voltage and current signals and their influence on bandwidth of control loops of electrical drives

Two new methods for sampling the discontinuous voltage and current signals in a PWM invertor-fed AC motor drive are proposed. The methods are based on sampling the instantaneous values and locally averaged values (over one carrier period) of signals. The analytical expressions for adjustment of digital current regulators and achievable bandwidths with the different sampling methods are derived. The results are experimentally verified.

[1]  V. Blasko,et al.  A novel control to actively damp resonance in input LC filter of a three phase voltage source converter , 1996, Proceedings of Applied Power Electronics Conference. APEC '96.

[2]  Takashi Sukegawa,et al.  A high accuracy current component detection method for fully digital, vector-controlled PWM VSI-fed AC drives , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.

[3]  V. Blasko.  A hybrid PWM strategy combining modified space vector and triangle comparison methods , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.