For speed-sensorless induction motor (IM) drives, the feedback matrix is a significant technique to enhance stability in low-speed regenerating region. However, further analyzes show it has difficulty for existing methods maintaining and robustness with parameter uncertainties. To cope this problem, article, graphical design method of multiple-error (ME-FBM) presented adaptive full-order observer. First, flux error introduced by projection current error. Adopting error, ME-FBM graphically...

The adaptive magnetizing current control (AMCC) has been presented for speed-sensorless induction motor (IM) drives to enhance speed observability around zero stator frequency. However, variations of result in inevitable harmonics speeds and torque. Addressing this problem, article proposes a predictive compensation-based AMCC (PC-AMCC) method compensate the reference torque current, relieve With equivalent model synchronous loop, analysis is carried out clarify origin harmonics. Then, are...

Model predictive current control (MPCC) has become one of the most promising strategies for synchronous reluctance motor (SynRM) drive system. However, parameters sensitivity is still a bottleneck problem MPC, and existing methods are not suitable sensorless control. This paper proposes MPCC strategy based on alternative high-frequency square-wave voltage injection (AHFSVI). The proposed inject an signals dq-axis stator voltage, estimating rotor position, speed inductance simultaneously. By...

To cope with the speed observability for speed-sensorless induction motor drives, low-frequency ride-through methods are presented to ensure at low stator frequencies during steady-state operations. However, current will increase since method is realized by correcting rotor flux reference or magnetizing reference. obtain optimal and higher efficiency, this paper proposes a optimization under different load conditions. Besides observability, minimum adopted as an additional objective derive...

This article deals with speed observation methods for sensorless induction motor drives (SIMDs). The observability of SIMD near zero stator frequency is a well-known concern. Using adaptive magnetizing current, existing are capable crossing the zero-stator-frequency line, but still limited to constant load conditions. To solve these problems, this presents phase compensation factor-based low method changing loads (PCF-LFCCL) realize process decreased overcurrent and spikes. First, influence...

It is well known that the stability of adaptive full-order observer (AFO) critical importance for speed-sensorless induction motors (IMs) at low speeds. The AFO can be improved by feedback gains design in low-speed regenerating mode, but few pieces literature realize observability under zero-stator-frequency operating conditions. To address this issue, proactive low-frequency ride-through (PLFRT) method proposed against changing torque paper. magnetizing current command adaptively with IM...

Pumped Storage Power Stations (PSPS) have gained attention for renewable energy storage. Achieving precise and fast automatic generation control (AGC) variable PSPS is challenging due to nonlinearities time-varying characteristics. Traditional approaches, like PID control, may be insufficient. This study proposes an adaptive fuzzy controller (AFPC) address these challenges. Design of different rules, anti-fuzzy approach, mechanism, comprehensive evaluation are introduced. The AFPC method...

This paper focuses on the feedback gains design methods of induction motor sensorless drive for stability enhancement in low-speed regenerating region. It is quite difficult to select legitimate values since four coefficients are coupling. The existing limited designing artificially, and only one objective considered each paper. To address this issue, a multi-objective optimization based (MOB) adaptive full-order observer developed. Three functions developed robustness analysis. Then MOB...

Many modern control strategies of synchronous reluctance machines (SynRM) require precise output torque, however, torque measurement systems usually introduce additional devices into the system, occupy volume and expend cost. As one solutions, can be estimated, but methods are always sensitive to machine parameters variation. This paper purposes a new useful method for SynRMs parameter identification estimation based on filter-free high frequency (HF) signal injection, which provide accurate...

The adaptive magnetizing current-based low frequency ride-through (LFRT) method has already been presented for speed-sensorless induction motor (IM) drives, ensuring the speed observability at stator frequencies. However, current and torque ripples will generate during active zero crossing (AZFC) with changes LFRT is enabled. To cope this problem, paper proposes a gradient descent-based operating point trajectory optimization AZFC. Firstly, details of are presented. Then, qualitatively...

To keep stable in low-speed regenerating regions, the magnetizing current is modified to limit synchronous speed of induction motor. However, due slow response loop and complicated signal propagation path, there exist phase delays between stator currents. The real-time match electromagnetic torque load cannot be ensured, which will lead unstable situation. address this issue, paper deals with delay for speed-sensorless motor drive reference current. Influences generalized path are discussed...