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Multimodal biometric could overcome the drawbacks of single biometric by combining two or more biometric traits for personal identity verification. The theory and experiments of multimodal biometric were studied based on hand vein, iris and fingerprint. Simple Average and Weighting Average fusion algorithm, the classical information fusion methods, were analyzed and the constraint conditions for improving...
Harmonic detection based on wavelet transform was studied. The single wavelet, multi-wavelet and wavelet packet transform and their fine kernel functions in fields of signal processing were adopted and selected. Detecting effect with different transform methods was compared. A kind of virtual harmonic detector based on LABVIEW was built. Time domain waveform of first and each harmonic was decomposed...
Current-feedback BUCK Converter, namely CCBUCK, which is the dominant component of SMPS system, have rich dynamical characteristic. For revealing internal relation between stability and system circuit parameters, Dynamical Characteristic for Current-feedback BUCK Converter was studied. Two closed loop circuit model based on PI regulator was built. The simulation model for CCBUCK, controlled by peak...
EMI problems in power electronics equipment keeps on increasing when power electronics device widely used. As the important component of power electronics equipment, EMI caused by phase switching in three-phase rectifier not only affected normal operation of its connected equipment but also polluted public grid system. EMI in AC and DC of three-phase rectifier were analyzed in detail. The equivalent...
System with mechanical speed sensor has lower reliability and higher cost. Traditional direct torque control method has disadvantages of big ripples on current and flux linkage and torque. To solve these problems, the Extended Kalman Filter is established to estimate both stator flux linkage and rotor speed. Therefore, speed sensorless direct torque control for surface permanent magnet synchronous...
Integrating the character of parallel power quality compensator and series power quality compensator, unified power quality conditioner (UPQC) has generally been accepted as a new electric power quality conditioner which has a good development prospect. But its widely adopted harmonic voltage measurements and harmonic current measurements based on instantaneous reactive power theory still have flaws...
To solve the problem that traditional PI controller is affected by the change of motor parameters and thus can't meet the high accuracy requirement, fuzzy PI speed controller is proposed. Current model of permanent magnet synchronous motor is built and motor speed is identified based on model reference adaptive theory. Speed adaptive law is derived according to Popov theory. Fuzzy PI controlled PMSM...
The growing interest in power quality has led to a variety of devices of mitigating power quality problems. Integrating the character of parallel power quality compensator and series power quality compensator, unified power quality conditioner (UPQC) has generally been accepted as a new electric power quality conditioner which has a good development prospect. A new harmonic signal detection algorithm...
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