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There is a disadvantage of the traditional SVPWM techniques of six-phase motors, it does not consider the synthesizing vector in harmonic subspace. This thesis proposes modified SVPWM techniques based on twelve vectors. The novel techniques are simulated in Matlab/Simulink system and simulation results are given. Finally the SVPWM techniques are realized in the practical platform.
In this paper the mathematical model of six-phase induction motor is established. Then the phase-fault SVPWM algorithm is put forward, and the simulation model is built in MATLAB to verify the feasibility of the algorithm. The system simulation and experiment of phase-fault of the six-phase induction machine are performed.
A new controlled fault current limiting (CFL) technology based on series vacuum switch was proposed to decrease the overvoltage and arc energy in current converting process. Compared with the directly fault current limiting (DFL), the response time of the CFL limiter, which is based on an optimum fault current zero-crossing prediction algorithm, was defined and analyzed. The arcing time, arcing current...
With the development of 500 kV power system, the fault current capacity has been increased rapidly. A 500 kV fault current limiter model was founded based on fault current capture technology and vacuum switch technology. The fault current limiter had two operation modes. One was named FFCL (Forced zero-crossing Fault Current Limiter) in which the current was directly converted to the limiting reactor...
A new intelligent controlled reactor (ICR) was proposed. The reactance of ICR can be changed by a moveable magnetic-wedge, and be a large reactance when fault and lower in normal. The electromagnetic model was founded and the magnetic circuit was analyzed, then the design formula of ICR's reactance was deduced. The structure of ICR was primary designed and modeled by using ANSYS. The equivalent reactance...
A novel SOI trench LDMOS with vertical double-RESURF is studied in this paper. A p-type silicon pillar is inserted beside the oxide trench as a vertical double RESURF layer, which can effectively modulate the electronic field and enhance the doping concentration in the drift region. The drain n+ region extends to the surface of buried oxide layer, shortening the motion-path in the high-resistance...
In this paper, we study the problem of Cross-View Person Identification (CVPI), which aims at identifying the same person from temporally synchronized videos taken by different wearable cameras. Our basic idea is to utilize the human motion consistency for CVPI, where human motion can be computed by optical flow. However, optical flow is view-variant - the same person's optical flow in different videos...
How to effectively learn temporal variation of target appearance, to exclude the interference of cluttered background, while maintaining real-time response, is an essential problem of visual object tracking. Recently, Siamese networks have shown great potentials of matching based trackers in achieving balanced accuracy and beyond realtime speed. However, they still have a big gap to classification...
Mechanical characteristics analysis of normal and defective transformer windings with eccentric distance under short-circuit (SC) fault are conducted using three-dimensional finite element method (3-D FEM). The change characteristics of maximum stress and displacement of defective windings with different eccentric distances of high voltage winding are obtained. It is found that the increase of the...
Phase-shifting reactor (PSR) can be used to solve the harmonic problems caused by rectifiers. In this paper, according to the active power balance principle, the relationships among DC current of load, currents of power supply side, as well as capacity of core limb are built, and the design specifications of winding and core are obtained. simulation of 6-phase rectifier system with PSR by the equivalent...
Non-destructive testing (NDT) has preoccupied a growing number of scientists in recent years. In the field of NDT, the eddy current testing is widely used in industry occasions. It is important to optimize the parameters of the planar eddy current coil to improve the sensitivity of non-destructive testing. In this paper, a planar eddy current excitation coil with the multi-frequency signal on a printed...
With the development of computer control technology and power electronics, six-phase induction motor control system has been widely used in industrial area due to its advantages. Through the study of single-phase induction motor SVPWM control technology, combined with the six-phase induction motor winding structure, a novel six-phase induction motor SVPWM control strategy is proposed and the third...
Software Defined Network (SDN) brings additional flexibility to the traditional network allowing the implementation of intelligent information processing. SDN introduces a new architecture, where the controller acts as the brain of the network controlling several tasks such as routing, load balancing and providing the required quality of service (QoS). However, having a centralized controller makes...
In crowdsourced testing, it is beneficial to automatically classify the test reports that actually reveal a fault – a true fault, from the large number of test reports submitted by crowd workers. Most of the existing approaches toward this task simply leverage historical data to train a machine learning classifier and classify the new incoming reports. However, our observation on real industrial data...
FBG inscribed on splice joint is proposed to be used as a sensor. It could realize temperature and strain measurement simultaneously because of the different strain responses of the different parts of the FBG inscribed on splice joint, while the temperature responses are same. The strain responses of four overlap values are discussed, which is used to optimize the discrimination capability of the...
Fiber Bragg grating(FBG) written in rotated fused polarization maintaining(RF-PM) fiber is proposed. The fiber structure constructs two Fabry-Perot interferometers. The spectral characteristics is analyzed and simulated. The Bragg reflection spectrum of fiber subjected to different loading angles are measured as the rotated fused angle is 22.5°. The experimental results show that the asymmetrical...
Software defect prediction, which predicts defective code regions, can help developers find bugs and prioritize their testing efforts. To build accurate prediction models, previous studies focus on manually designing features that encode the characteristics of programs and exploring different machine learning algorithms. Existing traditional features often fail to capture the semantic differences...
Polarimetrie measurement is the base of obtain of radar polarimetrie information, and the pattern of polarimetrie measurement and the selected waveform have an important influence on it. In this paper, a briefly introduction about the commonly interleaved-pulsed polarimetric measurement technique and the simultaneous-pulsed polarimetric measurement technique is presented. The ambiguity function and...
NHK has proposed a famous 3D audio system: 22.2 multi-channel system, but its loudspeakers are too many and are troublesome to put in home. Ando and Wang has proposed two simplification methods to reduce its channel number, but only 3D sound field at the central listening point can be recovered well by NHK 22.2 system and its simplified systems, the listening experience at a non central listening...
Advanced remote gaze estimation systems use automatic calibration procedure without requiring active user involving into the estimation of subject-specific eye parameters. Though automatic calibration process can simplify the difficulty of calibration task, it still needs time to collect information for completing the eye parameters of users before the gaze tracking system is used. This paper proposes...
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