Dynamic adaptive space vector PWM for four switch three phase inverter fed induction motor with compensation of DC - link voltage ripple

Abstract

This paper presents and analyses a new dynamic adaptive space vector PWM algorithm for four-switch three-phase inverters (FSTPI) fed induction motor under DC-link voltage ripple. By using reasonable mathematical transform, Space Vector PWM technique for FSTPI under DC-link voltage imbalance or ripples has been proposed, which is based on the establishment of basic space vectors and modulation technique in similarity with sixswitch three-phase inverters. This approach has a very important sense to solve hard problems for FSTPI under DC-link voltage imbalance, for example ensuring the required voltage for under modulation mode and over modulation mode 1 and 2, extended to six-step mode. The compensated technique also allows reduce the size of DC-link capacitors and the cost of the inverter. Matlab/Simulink is used for the simulation of the proposed SVPWM algorithm under DC-link voltage ripple. This SVPWM approach is also validated experimentally using DSP TMS320LF2407a in FSTPI-IM system. The effectiveness of this adaptive SVPWM method and the output quality of the inverter are verified.

Field-Weakening Control for Torque and Efficiency Optimization of a Four-Switch Three-Phase Inverter-Fed Induction Motor Drive

“…In the conventional fieldweakening control strategy of the 3-phase inverter drive, the d-axis current reference I d * is kept constant below the base speed ω base and above is reduced inversely to the motor speed ω r as shown in equation (6).…”