Research concerns the analysis of the influence of chosen pulse-width modulation (PWM) technique on the performance of the current estimator in vector-controlled induction motor drive under current sensor fault. The study was conducted based on the real measuremets from the laboratory test bench.
The results confirm that the selection of an appropriate PWM modulation strategy can improve the quality of estimation by up to 36.7% over the commonly used space-vector PWM (SVPWM). The results of the study can be the basis for the development of algorithms to improve the quality of stator current estimation over a wide range of drive operating points.
The data contains the results of research on the effect of the type of PWM modulation on the estimation of the phase currents of the stator winding. The measured (mea) and estimated (est) current waveforms in phase A and B in an electric drive with a 1.1 kW induction motor were taken into account. Each of the files is located in a folder whose name indicates the type of PWM modulation used, as well as the speed in percent of the rated speed (rated speed = 1500 rpm). Negative speed values refer to generator operation, while positive ones to motor operation. The research was conducted for a constant load of 50% of the rated torque.
File description:
isA_mea.xlsx, isB_mea.xlsx: currents measured in phase A and B respectively [p.u.]
isA_est.xlsx, isB_est.xlsx: currents estimated in phase A and B respectively [p.u.]
RMSE_A.xlsx, RMSE_B.xlsx: estimation error in phase A and B respectively [p.u.]
RMSE.xlsx: estimation error for both phases [p.u.]
time.xlsx: time vector [s]
The abbreviation in files’ names concern the analyzed pulse-with modulation techniques (PWM):
Continuous Pulse-Width Modulation techniques:
1/4 THIPWM, 1/6 THIPWM – third harmonic injection PWM techniques with amplitude 1/4 and 1/6 of fundamental component
SPWM – sinusoidal PWM technique
SVM – space-vector PWM technique
Discontinuous Pulse-Width Modulation (DPWM) techniques:
p120DPWM – (in literature: +120° DPWM) where for 120 degrees of the largest region of voltage of fundamental component there is no modulation
m120DPWM – (in literature: −120° DPWM) where for 120 degrees of the lowest region of voltage of fundamental component there is no modulation
p60 – (in literature: 60° DPWM) where for 60 degrees of the largest and lowest region of voltage of fundamental component there is no modulation
p60m30 – (in literature: 60° (−30°) DPWM) where for 60 degrees shifted by minus 30 degrees of the largest and lowest region of voltage of fundamental component there is no modulation
p60p30 – (in literature: 60° (+30°) DPWM) where for 60 degrees shifted by 30 degrees of the largest and lowest region of voltage of fundamental component there is no modulation
p30 – (in literature: 30° DPWM) where there are four regions of 30 degrees each where modulation does not occur
