An Improved Third-Order Generalized Integral Flux Observer for Sensorless Drive of PMSMs

A novel resonant frequency tracking control for linear compressor based on MRAS method

“…According to Popov's hyperstability theory, if the input and output of the nonlinear feedback path satisfy Popov's integral inequality (18), the necessary and sufficient condition for the gradual stability of the entire system is that the transfer function of the linear forward path is strictly positive real (SPR).…”

“…According to the error system constructed in the previous section, we substitute W and y into Popov's inequality (18)…”

Multi‐objective control and operation of grid‐connected small hydro‐solar PV‐battery energy storage‐based distributed generation

“…During DC offset, many control algorithms like Kalman filter [21], intelligent adaptive neuro‐fuzzy inference, least mean square (LMS) and least mean forth [22] are not able to eliminate harmonics and their effect is reflected during FC extraction. During harmonic distortions or unbalancing conditions, many researchers have proposed second‐order generalised integrator (SOGI) [23]‐based bandpass filters or their modified versions like improved dual‐SOGI [24], dual‐SOGI [25], improved‐SOGI [26] and fourth‐order‐based FOGI [27] for extracting FC and to inject pure sinusoidal current into PCC. Moreover, the FOGI‐based BPF algorithm has the capability of removing the DC offset.…”

Restart strategy for sensorless PMSM drive system based on zero‐voltage vector

“…In order to increase reliability and reduce cost, various advanced sensorless control structures have been proposed to remove the encoder in the drive system [1][2][3]. In general, the rotor position is obtained based on current measurements in these schemes [4][5][6][7][8][9][10][11][12].…”