In order to enhance the speed control performance of permanent magnet synchronous motor (PMSM) with internal and external disturbances, a new adaptive terminal sliding mode reaching law (ATSMRL) is proposed continuous fast (CFTSMC). Firstly, ATSMRL presented aim reducing input efforts, which can dynamically adopt all positive aspects in terms finite time convergence, high tracking precision, reduction chattering system. Secondly, an extended disturbance observer (ESMDO) designed estimate...

To promote the drive performance of permanent magnet synchronous machine (PMSM), such as tracking accuracy both speed and current, one improved deadbeat-based predictive current control (DPCC) scheme based sliding mode is proposed in this paper. First, novel PMSM model derived by considering uncertainties parameters external disturbances. Second, order to improve dynamic response system, (SMC) DPCC are employed respectively. Third, a unified high-order observer designed for estimation...

The new continuous fast terminal sliding mode control (CFTSMC) is adopted in this paper for the speed regulation of permanent magnet synchronous motor drive applications. CFTSMC method has a capability to converge error faster, provide higher tracking accuracy and robust against load disturbances. However, needs high switching gain during strong disturbances, which introduces chattering steady state variation system. To address these issues, composite technique based on extended observer...

In this study, a control scheme for the stand‐alone generation system based on brushless doubly‐fed machine (BDFM) is presented. The output voltage amplitude and frequency are kept constant under variable rotor speed load by regulating of winding (CW) current BDFM appropriately. utilises CW vector controller as inner loop, power outer loop. proposed has been implemented prototype designed variable‐speed ship shaft application. Moreover, satisfactory dynamic performance low total harmonic...

A novel sliding-mode-based extended state observer (SMESO) is proposed to improve the disturbance rejection ability and enhance dynamic performance of permanent magnet synchronous motor drive systems. First, an based on fast terminal sliding-mode control (FTSMC) method developed for better comparison, which can robustness against load disturbances, finite time convergence, get effective reduction chattering phenomenon. The SMESO-based FTSMC then by using SMESO estimate system total...

Abstract Background Bone defects in the maxillofacial region restrict integrity of dental function, posing challenges clinical treatment. tissue engineering (BTE) with stem cell implants is an effective method. Nanobiomaterials can effectively enhance resistance implanted cells to harsh microenvironment bone defect areas by promoting differentiation. Graphene oxide quantum dots (GOQDs) are zero-dimensional nanoscale derivatives graphene excellent biological activity. In present study, we...

The standalone brushless doubly fed induction generator (BDFIG) has demonstrated excellent energy-saving performance in ship shaft power generation applications. As a system, it exhibits unbalanced terminal voltages and poor under loads. However, the existing control scheme of grid-connected BDFIGs cannot be directly applied to stabilize amplitude frequency voltage when rotor speed electrical load vary. This paper presents new sensorless for BDFIG conditions system. A second-order...

Operating in the high-speed range is necessary for high-performance permanent-magnet synchronous motor (PMSM) drives. However, due to back electromotive force effect, PMSM approaching voltage limit at field decreasing scope. This paper presents a new flux-weakening scheme along with an improved vector control strategy alleviate influence of this problem. Control parameters anti-windup proportional and integral (AWPI) controller are optimized off-line relying on adaptive velocity particle...

The linear induction motor (LIM) drive in metros suffers heavily from low efficiency due to its large air-gap length and the partial load conditions, where high loss appears both LIM inverter when a constant excitation current is generally required. Worse still, end-effects, including transversal edge-effect longitudinal end-effect, would lead decrease of magnetizing inductance increase secondary resistance, resulting extra further deterioration efficiency. To reduce drive, this paper...

Bearing failure often occurs in doubly fed induction generator (DFIG)-based wind turbines which are usually subject to electrical corrosion effects. Fault diagnosis method based on signals has been paid much attention as the is noninvasive and cost-effective. This paper describes use of modulation signal bispectrum (MSB) detector for diagnosing bearing faults DFIGs turbines. The major theoretical principles involved with MSB presented it shown how amplitude phase relationships stator current...

In order to limit the armature current within a safe region, this paper proposes finite control set model predictive (FCS-MPC) method for linear induction machines (LIMs) by adding penalty overcurrent term in cost function. The modulation strategies based on two and three voltage vectors are combined with FCS-MPC so as reduce ripples steady-state tracking errors. Three different search methods have been developed help computational burden excluding many unsuitable participating combinations...

Flux estimation is of great importance for high-performance linear induction motor (LIM) drives. However, due to the end effects LIMs, range variation in mutual inductance and secondary resistance quite high with change operating condition, flux suffers from these LIM parameter variations. To alleviate influence variations, this paper proposes a new algorithm based on two improved extended state observers (ESOs) expanded bandwidth observing disturbances. One them especially designed observe...

This paper proposes a finite set model predictive control (FS-MPC) based thrust maximization technique for linear induction machines used in metros. For modeling of the proposed method, end effect is taken into consideration. The method to achieve maximum per ampere and reduce ripples. It differs from FS-MPC methods, where cost function consists angle errors. error calculated difference between reference predicted thrust, primary current secondary flux one side π/4 on other side. A...

In order to improve the working performance of linear metro, multistep model predictive control (MMPC) is applied induction machine (LIM) in this paper. However, due maximum current and voltage limitations, optimal problem becomes difficult handle practice. For simplifying an MMPC with constraints, first, solved off-line, assumption that input LIM continuous without limitations. And, expression constraint expressed by variables through mathematical simultaneously consider both Then,...

Doubly-fed variable speed pumped storage (VSPS) unit is an advanced hydropower system. In pumping mode, its input power can continuously be adjusted within a certain range via changing speed. Thus, it overcomes the major defect that cannot provide frequency regulation services to grid in mode. However, for mode VSPS, how establish model still problem. this article, electromagnetic-electromechanical transient multi-time scale of VSPS presented. This depicts intrinsic speed-power...

Microrobots are effective for monitoring infrastructure in narrow spaces. However, they have limited computing power, and most of them not wireless stable enough accessing difficult-to-reach areas. In this paper, we describe the fabrication a microrobot with bristle-bot locomotion using novel centrifugal yaw-steering control scheme. The operates network consisting an augmented reality headset access point to monitor infrastructures (AR) haptic controllers human–robot collaboration. For...

Rolling bearing vibration signals induced by local faults are highly correlated with structural dynamics. This leads to a great deal of research about signal processing for rolling condition monitoring and fault detection. However, the common diagnostic approaches, which were proposed manage constant speeds, unavailable variable speed cases. Tacholess order tracking is powerful method break limitations conventional methods while avoiding trouble tachometer installation reducing measurement...

The conventional control methods for brushless doubly-fed induction generator (BDFIG) normally employ mechanical sensors to acquire the information of rotor speed, which brings many disadvantages in cost, complexity, reliability, etc. This paper presents an improved speed observer (RSO) sensorless operation standalone BDFIGs, is based on power winding (PW) voltage and (CW) current. In order eliminate impact unbalanced nonlinear loads RSO, second-order generalized integrators (SOGIs) low-pass...

One of the methods that is used to increase efficiency linear induction machine (LIM) maximum thrust per ampere (MTPA), where same can be achieved with a lower value primary current. Consequently, power loss decreased and increased. However, so far, no quantitative focus exists LIM. This article proposes MTPA-based finite-set model predictive control. The concept field-oriented control achieve condition MTPA. Based on this condition, proposed method developed by adjusting flux linkage....

The aim of this paper is to investigate the sensorless voltage control schemes for promising wound-rotor brushless doubly-fed induction generator (BDFIG) in both stand-alone and grid-connected systems. For target, a new rotor position observer using space vector flux relations BDFIG suggested. proposed algorithm does not require any additional observers obtaining speed by directly detecting position, which may reduce cost overall system. purpose, direct (DVC) scheme applied However, strategy...

The traditional system frequency response (SFR) model is not applicable to the study of contemporary power grid due large capacity (single unit up 500 MW) type-II doubly-fed variable speed pumped storage (VSPS) considered. This article proposes an improved reduced-order SFR for integrated with large-scale VSPS. proposed models Compared model, this takes into account active coupling effect type VSPS, and computational burden increase small VSPS has been reduced greatest extent. Therefore, can...

Sensing and cognition by homeowners technicians for home maintenance are prime examples of human–building interaction. Damage, decay, pest infestation present signals that humans interpret then act upon to remedy mitigate. The process has direct effects on sustainability economic vitality, as well the health well-being building occupants. While practices date back antiquity, they readily submit augmentation improvement with modern technologies. This paper describes use networked smart...