Lithium-ion battery refers to a complex nonlinear system. Real-time diagnosis and accurate prediction of state charge(SOC) parameters are hotspots critical issues in research. To reduce the dependence charge on model accuracy speed, achieve real-time online estimation, SOC lithium-ion system is developed based support vector machine (SVM). SVM parameter optimized using an algorithm particle swarm optimization, performance assessed cross-validation. The obtained experimental data simulated,...

With the rapid development of electric vehicle (EV) industry, charging facilities for vehicles are gradually improving, thus meeting demand fast and safe charging. This paper comprehensively describes current status future trend EVs their infrastructure analyzes in detail EV fast-charging system architecture according to AC/DC coupling configuration. The topologies control techniques front converter rear DC/DC discussed, providing a reference design hundred-kilowatt level above systems EVs....

To improve the performance of a current loop, this paper presents novel control scheme for an interior permanent magnet synchronous motor (IPMSM) based on model predictive (MPC) algorithm in rotating frame (dq-frame). The recently developed explicit MPC (EMPC) is introduced to ensure feasibility real-time implementation hardware. achieve feasible reformulation problem using EMPC, coupled nonlinear IPMSM mathematical linearized augmented with disturbance. Furthermore, approximate related...

ABSTRACT The onboard charging system of electric vehicles operates with high voltage, current, and high‐frequency switching components, which generates electromagnetic interference that not only affects the operating characteristics other electronic devices in vehicle but also directly driving safety serious cases. To address compatibility system, considering influence oscillations wide‐bandwidth semiconductor devices, analyzing rules for layout wiring three‐phase EMI filter utilizing finite...

Based on current research into the mathematical model of permanent magnet synchronous motor (PMSM) and feedback linearization theory, a control strategy established upon is proposed. The Lie differential operation performed output variable to obtain state nonlinear system, dynamic characteristics original system are transformed linear characteristics. A controller based input–output algorithm designed realize PMSM. decouples d–q axis from flux linkage information outputs voltage. When speed...

Abstract Aiming at the electrical safety problems of lithium‐ion battery system due to series arc fault, a finite element simulation model square under fault is established based on magnetohydro‐dynamic equations. The voltages different electrode spacings are analysed, and electric field distribution, magnetic temperature flow velocity around investigated determine maximum values locations strength, density, time fault. Then, basis experimental platform, value starting voltage critical power...

With the widespread application of electrochemical energy storage technology, safety issues lithium-ion batteries have garnered significant attention. The issue arc faults resulting from electrical failures is especially critical, as it can lead to catastrophic battery disasters. Therefore, this paper first established an testing platform and conducted experiments on top cover body prismatic analyze thermoelectric characteristics between battery. Under experimental conditions 300 V 15 A, was...

In order to overcome the deficiency of sentiment analysis based on traditional machine learning, which difficulty effective feature selection and inadequacy marked training corpus will affect performance classification system, we address emotions problem Chinese product reviews text by combining convolutional neural network (CNN) with bidirectional long-short term memory (BiLSTM) in this paper. The CNN can extract sequence features from global information, it is able consider relationship...

Because of the abundance news on web, recommendation is an important problem. We compare three approaches for personalized recommendation: collaborative filtering at level items, content-based system recommending items with similar topics, and a hybrid technique. observe that according to topic profile current browsing session seems give poor results. Although articles change frequently thus data about their popularity sparse, applied individual provides best

Based on current research into the vector control principles of permanent magnet synchronous motor (PMSM), a strategy founded upon an Active Disturbances Rejection Controller (ADRC) is proposed. This consists ADRC speed loop and controller. By studying factors affecting running state PMSM, mathematical model established, design principle active disturbances rejection controller analyzed in order to loop. The considers errors caused by uncertain factors, such as external disturbances, be...

During the power transmission of doubly-fed induction generator (DFIG), due to influence series compensating capacitance and long-distance transmission, DFIG is prone sub-synchronous oscillation, which damages stability system. By establishing mathematical model system, cause oscillation its on control strategy system are discussed. In order solve problem performance degradation traditional phase-locked loop (PLL) under an improved PLL proposed replace PLL. Aiming at that rotor side...

The traditional on-board charging system can only realize the one-way transmission of electric energy from grid to power battery. To address this issue, paper proposes a bidirectional based on three-phase wye-wye connected CLLLC resonant converter. It adopts two-stage structure, front-stage is totem pole converter and rear-stage Based characteristics, working principle analyzed, equivalent circuit model derived using fundamental wave analysis, voltage gain, impedance characteristics zero...

This paper focuses on the power grid oscillation of grid-side converter (GSC) in doubly-fed induction generator (DFIG) caused by sub-synchronous (SSO), and designs a measure to improve output quality GSC. Firstly, influence mechanism multipath disturbance GSC under SSO is sorted out, factors action modes are clarified. Secondly, estimation phase-locked loop (PLL) control strategy calculation process analyzed. Furthermore, mathematical model considering PLL established. At same time, key for...

In order to evaluate the risk of transmission line tripping due wildfires, it is necessary predict breakdown voltage insulation gap under flame. Firstly, this paper studies prediction rod–plane gaps full-flame bridging wooden cribs; then obtains and leakage current values considering different sizes cribs distances. Then, a multi-physical field simulation carried out obtain flame characteristic parameters, such as spatial temperature. The feature quantity normalized reduced in dimension,...

This paper presents a wide input voltage vehicle DC/DC converter based on an LLC resonant for 48 V light hybrid power system. According to the design requirements of on-board converters and analysis their system characteristics, full-bridge is employed with zero-voltage activation switching transistors through elements. In terms control strategy, unsatisfactory high-frequency regulation gain analyzed under frequency modulation (FM) strategy. addition, accommodate operating conditions,...

The doubly fed induction generator with super capacitor is helpful to enhance the system inertia. At same time, its structural characteristics are more suitable for power grid topology without communication lines. However, change of also brings some problems. In this article, when SCESS-DFIG participating in frequency regulation, DC bus voltage fluctuation caused by imbalance multiple converters studied. dynamic response DC-DC converter a step load side converter. nonlinear and random, so...

The poor dynamic performance problem of a Full-Bridge converter under traditional control strategy is investigated in this study. A new parameter adaptive terminal sliding mode policy developed for DC-DC converter, by combining the integral part with power function and differential design surface. In theory, steady-state error system can approach zero within short time. To manage un-ideal situation after using fixed value γ, an improved γ algorithm proposed. output tracked adjusted real...

This paper presents a single-phase and three-phase compatible isolated on-board charger for electric vehicles. The is with the AC voltage input composed of two-stage circuits. Based on six-switch power factor correction (PFC) circuit, by switching off, front stage transformed into cascade topology totem-pole PFC circuit boost circuit. rear full-bridge LLC resonant converter. In or working mode, front-stage control strategy double closed-loop control. current inner loop controller improved PI...

Anti-Lock Braking System (ABS) has become a standard configuration for vehicles. We created virtual environment to approximate the external conditions by using ABS dynamic simulation test stand performance of ABS. Measurement and analysis are two important issues ensuring high quality In this paper, an automatic measurement examination platform based on powerful software LabVIEW is designed implemented. easy monitoring data acquisition. Parameters recorded analyzed simultaneously applying...