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This paper proposes a novel rotor position estimation algorithm used for reference frame transformation in the direct power control (DPC) of a doubly-fed induction generator (DFIG) in wind power applications. The proposed algorithm can be used as a primary rotor position information provider to replace the rotor position sensor or a backup rotor position information provider during the malfunction...
This paper studies stability issues of sensorless torque control of high power interior permanent magnet synchronous machines (IPMSMs) under large load transients, e.g., complete torque reversals with the highest slew rate allowed. To perform a sensorless vector control, a current model-based sliding-mode observer is utilized to estimate the rotor position. The correlation between current regulation...
This paper presents an extended back electromotive force (EMF)-based discrete sliding-mode observer (SMO) for rotor position/speed sensorless control of interior permanent magnet synchronous machines (IPMSMs). Normally, the dead-time effects in voltage source inverters are often ignored or assumed to be fully compensated when designing a position observer. However, for high-voltage and high-power...
Because of the high robustness to system structure and parameter uncertainties, discrete-time sliding-mode observer (DSMO) has become a promising candidate for sensorless digital control of interior permanent magnet synchronous machines (IPMSMs). However, it is challenging to achieve fully sliding mode under a low sampling frequency, especially for high speed and heavy load applications. In order...
Robust rotor position observer is one of the key issues in the position sensorless interior permanent magnet synchronous machine (IPMSM) drive system design. Several model-based observers have been proposed to estimate rotor position and speed without mechanical sensors. However, because of unmodeled nonlinearities, e.g., inverter dead-time effect, inductance cross saturation, as well as other machine...
Back electromagnetic force (EMF)-based methods are commonly used for sensorless control of interior permanent magnet synchronous machines (IPMSMs) in medium and high speed range. The feature of high robustness to system structure and parameter uncertainties makes the sliding-mode observer (SMO) a promising candidate for rotor position estimation. In a practical drive system, because of physical limitations,...
Sliding-mode observers (SMOs) offer a promising solution for sensorless control of interior permanent magnet synchronous machines (IPMSMs) due to their excellent robustness to system structure and parameter uncertainty. However, in practical applications, it is challenging for an SMO to achieve a perfect estimation for the back electromagnetic force (EMF) using a finite or relatively lower sampling...
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