Abstract—A refined space vector modulation scheme for an eleven-level inverter system for dual-fed induction motor drive, using only the instantaneous sampled reference signals is presented in this paper. The dual-fed structure is realized by opening the neutral-point of the conventional squirrel cage induction motor. The eleven-level inversion is obtained by feeding the dual-fed induction motor with asymmetrical four-level inverter from one end and symmetrical three-level inverter from other end. The proposed space vector pulse width modulation technique does not require the sector information and look-up tables to select the appropriate switching vectors. The inverter leg switching times are directly obtained from the instantaneous sampled reference signal amplitudes and centers the switching times for the middle space vectors in a sampling time interval, as in the case of conventional space vector pulse width modulation.

Index Terms—Dual-fed induction motor, eleven-level inverter, middle space vectors, sinusoidal reference signals, space vector PWM.

The authors with the Dept. of Electrical Engineering, R.V.R and J.C. College of Engineering, Guntur-522 019,INDIA(e-mail: sambasiva.gudapati@gmail.com; e-mail: cskoritala@gmail.com).

Cite: G.Sambasiva Rao and K.Chandra Sekhar, "A Refined Space Vector PWM Signal Generation for Eleven-level Inverter," International Journal of Computer and Electrical Engineering vol. 3, no. 6, pp. 830-839, 2011.