An experimental platform of high temperature superconducting (HTS) synchronous motor with HTS flux pump has been designed and under construction. The as an exciter eliminates thermal load from the metal current leads, which will reduce cryogenic volume improve efficiency machine. A finite element model (FEM) using T-A formulation was developed to analyze electromagnetic characteristics a double-pancake (DP) racetrack coil. no-insulation (NI) coil wound by YBCO tapes fabricated winding...

The linear-motor type flux pump is a wireless DC power source for high-temperature superconducting coils, which compact in size, efficient energy use, fast output control, etc. It consists of three major parts: windings, phase windings and iron circuit, generates DC-bias AC travelling wave its airgap. In theory, there are controllable parameters such as field, amplitude the wave, field frequency (travelling speed). By changing those parameters, we change applied fields current into coils....

This paper presents the design process and test results of a high-temperature superconducting pulsed-power transformer (HTSPPT). The primary winding HTSPPT is constructed out several double-pancake-type coils connected in series. Every coil made Bi2223/Ag tapes. secondary single-pancake-type normal conductors. configuration designed such that are arranged interleaving. testing experiments show high-current impulse could be achieved with small current primary, which proves circuit feasible.

This paper presents a novel nonlinear control strategy for superconducting magnetic energy storage (SMES) system during network unbalance. Grid voltage unbalances tend to substantially degrade the operation of SMES system; conventional methods cannot completely address this issue. In paper, three selectable targets are identified according working principle under an unbalanced condition reduce impacts second harmonics in output power, reactive and grid-side current. Next, port-controlled...

A kilo-amp linear-motor type flux pump with the maximum output DC current exceeding 1610 had been designed and manufactured. We optimized large-current based from previous design, shortened travelling wavelength of pump, simulated its magnetic density distribution COMSOL Multiphysics, obtained present design parameters after analysis. placed 12 superconducting single loops side by in air gaps on both sides used to charge them. applied different gap, was measured at 1619 liquid nitrogen 77 K....

Ultrahigh-frequency (UHF) antenna sensors are used extensively for partial discharge (PD) detection to diagnose insulation systems subjected high dV/dt voltage waveforms, e.g., inverter-fed motors. Through frequency spectrum analysis and appropriate high-pass filtering, it is possible remove the source interference reliably detect PD activity; however, still unclear whether content of signals gathered representative or sample under test, acting as a transmitting antenna. In this paper,...

A novel high-efficiency resonant light emitting diode (LED) backlight driver with passive current balancing and dimming is proposed analyzed in this paper. The LED achieves uniform brightness of each string by the charge balance capacitor, which benefits from high efficiency. By controlling output one string, currents other strings can be controlled via capacitors, makes its control simple. uses only active switch, decreases circuit volume simplifies control. Furthermore, a wide load range...

A high-temperature superconducting (HTS) no-insulation (NI) magnet charged by multiple flux pumps has been constructed and tested. The consists of 5 NI double pancake coils (DPCs), whose inner diameter is 50 mm, outer about 92 the axial length mm. To avoid current limitation single DPC on whole fully use capacity each DPC, DPCs were 3 separate to provide different DC currents. rotor speed pump was controlled LABVIEW program microcontroller regulate charging central magnetic field, which...

This paper investigated the method of using multiple linear-motor flux pumps to increase central magnetic field an HTS magnet composed six stacking insulated YBCO double pancake coils. In this work, we compared two different excitation methods based on pumps, i.e., in series and segmented excitations, investigate their exciting performances magnet. Experiments showed that excitation, maximum operation current was limited by coil smallest critical current. On other hand, both each were...

An inverter-fed motor operating above 6 kV driven by the pulse width modulation (PWM) voltage will experience severe electrical and thermal stress. Thus, it is important for insulation designers to study temperature rise potential distribution of conventional stress grading system, which comprises main wall insulation, conductive armor tape (CAT) (SGT) under repetitive square voltage. Here, two types system are designed optimized, several experiments simulations performed. The time found...

Modular multilevel converters (MMCs) have the advantages of high‐power density and small‐harmonic distortion because their modularity flexibility, thus providing a new avenue for research into scalable superconducting magnetic energy storage (SMES) in renewable generation. This study presents coordinated control three‐phase four‐wire (3P4W) MMC‐based SMES system under unbalanced voltage applications. First, positive‐ negative‐sequence mathematical models port‐controlled Hamiltonian with...

In this paper, a superconducting magnetic energy storage (SMES) device based on sliding mode control (SMC) is proposed for grid-connected photovoltaic (PV) systems that can effectively improve the ability of PV system to withstand low-voltage ride-through (LVRT) during faults. SMC theory selected as nonlinear technique, since SMES has characteristics being multivariable and having strong coupling in running process. Both voltage outer loop current inner adopt strategy an exponential reaching...

High-impedance transformers can reduce short-circuit currents, but they also cause system stability problem. This paper establishes a BPA simulation model to study the influence of transformer impedance on stability. Through three-phase sudden short circuit fault system, different impedances high resistance dynamic process is studied. It concluded that high-impedance has great current, bus voltage and power angle revealing law with impedance. these three criteria, general method for...

Abstract End turn grading with resistive–capacitive coupling experiences severe electrothermal stress when subjected to pulse width modulation (PWM) voltage. In this paper, several experiments and simulations were carried conducted for four types of end grading. First all, the temperature rise in increased a decrease time. When time was less than 500 ns, at terminal higher owing capacitive current coupled from main wall insulation. Further, linear region exhibited minimal variation different...

Abstract Stress grading systems using non‐linear resistive coatings are a key component to suppress surface corona in the end‐windings of rotating machine. Compared sinusoidal‐fed motor, high slew rate voltage at flanks repetitive square voltages from inverter cause large capacitive currents flow main wall insulation. These currents, if not properly considered design phase, lead severe electrothermal stress system. Experiments and simulations were conducted on system whose structure arises...

Silicon carbide (SiC) devices have great potentials in inverter-fed motor. But their high switching dv/dt can increase the voltage stress on motor windings and cause partial discharges (PD). PD detection is routinely used to factory quality assurance test of equipment, Ultra-highfrequency (UHF) antenna are commonly for PD. This paper proposes a novel method based radiation characteristics theory shell slot antenna: The (Shell Slot Antenna) as UHF detection. In this paper, working frequency...

With the development of renewable energy sources (RES), safe and stable operation power system is facing a new challenge. Because intermittency fluctuation RES, more regulation resources are needed to alleviate threat system. Compared with traditional generation units, large-scale flexible loads at demand side can provide huge potential for accommodating RES by response (DR), such as air conditioners (ACs), electric vehicles (EVs), storage systems (ESSs). The models developed firstly, based...

Aiming at the prevention of information security risk in protection and control smart substation, a multi-level defense method substation based on data aggregation convolution neural network (CNN) is proposed. Firstly, intelligent electronic device(IED) uses "digital certificate + digital signature" for first level identity authentication, UKey identification code second physical authentication; Secondly, device group monitoring layer judges whether report tampered during transmission...

In order to solve the problems of low real-time and insufficient accuracy current substation equipment state analysis methods, this paper proposes an independent controllable security container monitoring method based on cloud edge cooperation mode. This combines computing technology with build a collaborative architecture for power analysis; On side, ordered processing data is realized correlation provide reliable complete support; side master station, dynamic C4.5 decision tree algorithm....

With the continuous acceleration of meteorological industry process and improvement measurement accuracy, combined with accumulation data throughout year, finding valuable information from massive is most serious problem facing meteorology. This article analyzes intelligent analysis method weather based on artificial intelligence algorithm. In data, algorithm introduced to analyze solve some problems. Experiments establishment prediction models predict precipitation. The experimental results...