Space vector PWM ‐based current error boundary investigations for three‐level VSI fed induction motor drive

Abstract

Field oriented control (FOC) of induction motor (IM) powered by a threelevel voltage source inverter (3L -VSI) with space vector (SV) based continuous and dis -continuous pulse width modulation (PWM) is presented in this paper. The current error variations in each sector with above-mentioned PWM techniques are monitored and analyzed mathematically. These boundary investigations play a great role in the implementation of Current Error Space Phasor (CESP) based hysteresis current controller (HCC) which incorporates the advantages of a constant switching frequency PWM fed three-level inverter (3LI) into highly dynamic current controlledvoltage source inverter. As a preliminary step, FOC of IM with the conventional space vector PWM and bus clamping PWM (BC30 and BC60) fed 3LI have been simulated using SIMULINK toolbox of MATLAB. Transient analysis of the drive with acceleration, deceleration, and load change studies with different switching schemes are analyzed with d SPACE RTI1103 experimentation on a 2.2 kW three-phase IM drive in detail. K E Y W O R D Sbus clamping PWM, current error space Phasor, current ripple, field-oriented control, three-level inverter | INTRODUCTIONMotor drives are the backbone of global industry. Rapid industrialization all around and demand for the control of electric power for electric motor drives are at an increase rate every day. Inverters are introduced, which have the ability of generating voltage with variable magnitude and frequency, and thus AC motor drives are on the rise in current market. Inverter fed drives are nowadays being called adjustable speed drives. As in the case of the AC motor being used, it is the induction motor that is on high demand due to its sturdy construction, absence of brushes, etc. 1 Inverters can be classified into voltage source inverter (VSI) and current source inverter (CSI). VSI's are preferred to CSI's for the recent past especially in the low and medium voltage drives. [2][3][4][5] Current controlled VSI's are more promising for high-performance drives which offer better dynamic behavior.