Modeling of AC voltage source inverter with dead-time and voltage drop compensation for DPWM with switching losses minimization

Modified Technique of Parameter Identification of a Permanent Magnet Synchronous Motor with PWM Inverter in the Presence of Dead-Time Effect and Measurement Noise

“…The presence of noise or distortion in the experimental data leads to distortion of the estimation results: the estimation variance is determined by the signalto-noise ratio and does not decrease with an increase in the number of samples or decreasing the sampling period. The described features make the empirical estimation of the FRF by Equation (15) rather inaccurate. This is explained by the fact that no specific features of experimental data are used in the estimation and there is no data compression [31,33,39].…”

“…• change of the PWM inverter design or switch control algorithms [15,16]; • application of modified control algorithms to reduce torque ripples, including repetitive, iterative-learning or self-tuning controllers [17][18][19]; • compensation of the dead-time effect using its mathematical models [14,[20][21][22].…”

Dead-Time Inverter Voltage Drop in Low-End Sensorless FOC Motor Drives

“…The constraints posed by low bandwidth, along with nonlinear voltage drops introduced by the driving system, as highlighted later in this study, and dead-time inverter voltage drops contribute to suboptimal controllability at low motor speeds. To address this problem, voltage drops are typically modeled as an average voltage loss over the switching period and compensated directly within the abc-reference frame [10][11][12][13]. This compensation involves integrating them into the reference voltages generated by the FOC scheme, before entering the Pulse Width Modulation (PWM) stage.…”

“…In summary, by applying Equation ( 14) to Equations ( 9) and ( 13), we derive the normalized values of the inverter and motor winding voltage drop, vao,drop(t)* and vam,drop(t)*, respectively. The values for phase a are plo ed against time in Figure 6 using Vdrop in Equation (10) as the base value, assuming that the motor is fed with the arbitrarily selected symmetrical sinusoidal three-phase currents in the top graph. Similar values can be obtained for the remaining b and c phases.…”

Dead-Time Inverter Voltage Drop in Low-End Sensorless FOC Motor Drives

“…The constraints posed by the low bandwidth, along with the nonlinear voltage drops introduced by the driving system, particularly as highlighted later in this study the dead-time inverter voltage drop, can contribute to suboptimal controllability at low motor speeds. To tackle this problem, the voltage drops are typically modelled as an average voltage loss over the switching period and are then compensated directly within the abc-reference frame [10][11][12][13]. This compensation involves integrating them into the reference voltages generated by the FOC scheme, right before entering the Pulse Width Modulation (PWM) stage.…”