In this study, a robust fault-tolerant predictive current control (RFT-PCC) algorithm based on composite observer is proposed for permanent magnet synchronous motors (PMSMs), which can eliminate the influence of motor parameter perturbation and demagnetization. First, effects demagnetization vector are analyzed conventional control. The sliding mode Luenberger then designed to observe compensation voltage prediction value next time simultaneously. Finally, an RFT-PCC method developed. able...

An adaptive droop-based hierarchical optimal voltage control (DHOVC) scheme is proposed for voltage-source converter high-voltage-direct-current (VSC-HVdc) connected offshore wind farms (WFs). The turbines (WTs) and WF side VSC (WFVSC) are coordinated to minimize the deviations of buses inside from nominal mitigate reactive power (Var) fluctuations WTs. model predictive used improve performance DHOVC during a certain horizon. A solution method based on alternating direction multipliers...

In this study, the multi-objective optimization considering renewable energy uncertainty and electric vehicles (EVs) is proposed for regional integrated systems (RIES), which can balance economy environmental friendliness of system. Firstly, influence factors such as disordered access charging/discharging EVs on system operation considered, an orderly charging discharging model established according to driving laws. Then, a robust with polyhedral set constructed handle output. Moreover,...

Grid-forming converters (GFMs) can enable power electronics to mimic the inertia response of synchronous generators (SGs), which enhance frequency stability ac grids with high penetration renewable energy sources (RESs). However, GFMs potentially induce oscillations during support because similar external dynamics SGs. In this paper, a disturbance observer-based sliding mode controller (PDOSMFC) is proposed facilitate flexible and system damping through GFMs. By leveraging intrinsic ability...

The permanent magnet synchronous motor (PMSM) has become a core component of electromechanical energy conversion in the modern industrial field. In order to expand application PMSM field high-power traction, robust predictive torque control (R-PTC) strategy for N-segment three-phase (N*3-phase PMSM) is proposed this article. First, output characteristics N*3-phase are illustrated with finite-element analysis method, and mathematical model established. Then, six-segment system driven by six...

Traditional fault diagnosis methods are easy to be affected by different working conditions. This article proposed a motor method based on visual knowledge, reduce the impact of changes in conditions and improve feature extraction ability. The mapping relationship between actual faults image intuitive features symmetrized dot pattern scale-invariant transform is established this article. state obtained statistics matching point with dictionary templates generated from signals normal unnormal...

This paper proposes a novel topology of voltage balance circuit for ALL-DC offshore wind farm with series-connected turbine. In the proposed topology, adjacent turbines are connected by in parallel, and these can achieve both maximum power point tracking terminal voltages when speeds unequal. With current compensation circuit, this ensure normal operation even if some outage. Furthermore, double loop controller is designed, which does not require communication among turbines, stability...

In this paper, a predictive stator flux control (PSFC) algorithm for permanent magnet synchronous motor (PMSM) drives is proposed, which can eliminate the influence of linkage parameter perturbation and rotor position error. First, sensitivity conventional current (PCC) to analyzed. Then, novel composite discrete time sliding mode observer (SMO) based on state designed, estimate perturbation, error, load torque simultaneously. Finally, PSFC method developed, enhance robustness PCC against...

Fault prediction of electromechanical equipment can greatly reduce its maintenance cost and prevent catastrophic damage. In order to realize the accurate fault equipment, a method based on spatial-temporal graph information is proposed in this article. method, signal data each intermittent monitoring period are expressed by Markov field information, correlation features extracted studied multivariate neural networks. The effectiveness for different state expressions demonstrated motor from...

In this study, a novel robust deadbeat predictive current control algorithm using voltage coefficient matrix update (DPCC-VCMU) is proposed for permanent magnet synchronous motor (PMSM), which can eliminate the influence of model parameter mismatch. First, sensitivity conventional (DPCC) discussed, and multiple error online identifiers are designed based on an improved Adaline neural network (ANN) weight adjustment algorithm. The identification structure with mismatch as then to enhance...

Grid-forming converters (GFC) are promising technology for improving the grid inertia and frequency stability via voltage source (VSC). However, GFCs could make ac-side oscillations more complicated since it mimics dynamics of synchronous generators (SG), spread to dc systems. This paper investigates mechanism interactions between ac grids, proposes an enhanced GFC improve damping performance on oscillations. By separating system model into GFC-related transfer functions (TF) grid-related...

Considering the complex flight conditions of aircraft and difficulty oil-electric hybrid system to rationally allocate energy power give full play various advantages under different conditions, an management strategy based on multi-objective model prediction is proposed optimize engine working area, minimize dynamic characteristics, optimally manage charge state storage battery. First, fuel consumption efficiency curve identification maximum likelihood method obtain optimal area engine. The...

This paper proposes a robust nonlinear predictive current control (RNPCC) method for permanent magnet synchronous motor (PMSM) drives, which can optimize the loop performance of PMSM system with model parameter perturbation. First, disturbance caused by perturbation was considered in modeling PMSM. Based on this model, influence conventional (PCC) analyzed. The composite integral terminal sliding mode observer (SMO) then designed to estimate real time. Finally, RNPCC is developed without...

This paper presents a cascaded robust fault-tolerant predictive control (CRFTPC) strategy with integral terminal sliding mode observer (IT-SMO) to achieve high performance speed loop and current for permanent magnet synchronous motor (PMSM) drives. The modeling of PMSM considers the disturbance caused by parameter perturbation demagnetization. With this model, we can derive optimal law proposed scheme, which avoids tuning work weight factor effectively. new CRFTPC has structure, external...

In this article, a novel predictive torque and stator flux control (PTSF) method is proposed for N-segment three-phase permanent magnet synchronous motor (N*3-phase PMSM), which can effectively eliminate the influence of parameter mismatch on torque. The PTSF has two loops, loop loop, both implemented with robust algorithm. First, controller robustness designed, sensitivity its parameters analyzed. dq space, one-step delay compensation then proposed, enhance against mismatch. Moreover, based...

This study proposes a fault-tolerant control method for permanent magnet synchronous motors (PMSMs) based on the active flux linkage concept, which addresses (PM) demagnetisation faults in PMSMs. First, mathematical model PMSM is established linkage, and then effect of PM analysed. Second, stator current static coordinate set as state variable, an observer designed sliding-mode variable structure, equation dynamic estimation equivalent principle structure. Finally, next moment predicted...

In order to reduce the influence of environmental noise and different operating conditions on accuracy motor fault diagnosis, this paper proposes a capsule network method combining multi-channel signals efficient channel attention (ECA) mechanism, sampling data from multiple sensors visualizing one-dimensional time-frequency domain as two-dimensional symmetric dot pattern (SDP) image, then fusing image extracting using ECA mechanism features match eight types for classification. guarantee...

In inverters based on a single proportional-integral (PI) or deadbeat (DB) controller, an inherent resonance peak may emerge near their current loop cut-off frequency, which results in harmonic amplification even resonance. Additionally, inappropriate filter circuits implemented sampling result the expansion of peak. Thus, this paper further investigates influence PI- DB-based control loop. Then, RC circuit is designed to reduce Moreover, compound strategy improved repetitive controller...

The permanent magnet synchronous generator (PMSG) is widely used in high voltage DC transmission technology of wind power systems due to its high-power density, reliability and simple maintenance. To meet the increasing rated (≥10 MW), multi-converter parallel connection usually used, which significantly increases complexity cost system. Therefore, a new modular N* three-phase PMSG proposed this paper. Based on structure working principle generator, finite element model established,...

The ESS is considered as an effective tool for enhancing the flexibility and controllability of a wind farm, optimal control scheme farm with distributed ESSs vital to stable operation power generation. In this paper, coordinated active reactive strategy based on model predictive (MPC) proposed doubly fed induction generator (DFIG)-based (WF) energy storage systems (ESSs). coordinates output among DFIG turbines (WTs), grid-side converters (GSCs), inside WF, aim decrease fatigue loads WTs,...