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Direct Torque Control (DTC) is a method to control the torque in variable frequency drives. This paper describes sensorless DTC of brushless dc (BLDC) motor drive operating in constant torque region under two phase conduction mode to get instantaneous torque control. Sliding Mode Observer (SMO) which is low sensitive to parameter variation is proposed to estimate the phase-to-phase trapezoidal back-EMF...
This paper presents the development and performance analysis of model reference adaptive controller using Artificial Neural Network (ANN) for Brushless DC motor (BLDC) drives. The model reference adaptive systems (MRAS) have a parameter adjustment mechanism along with the normal feedback loop and hence give better solutions when there are variations in process parameters. Neural networks (NNs) with...
This paper proposes a simple technique for open phase fault detection, and identification of BLDC motor. Also it explains a fault tolerant strategy which can be used to continue the normal operation of a BLDC motor in spite of the open phase fault. As BLDC motors are used in critical and dangerous control areas like military services, space vehicles a fault tolerant drive is essential to maintain...
In recent years, power demand has increased day by day while the expansion of power generation and transmission has been limited due to limited resources and environmental restrictions. Flexible Alternating Current Transmission Systems (FACTS) devices play an important role in improving the power system performance. Flexible AC transmission systems devices have been mainly used for solving various...
This paper presents a novel and low cost strategy to enhance the life of output electrolytic capacitor in a battery charger used for domestic applications for example LED emergency lamp. A simulation study using MATLAB/SIMULINK is carried out to ascertain the credibility of the proposed strategy and results are furnished to support the same. Result analysis is done and a comparison is provided between...
We are motivated by the fact the noise can enhance the performance of the system. And one such counter-intuitive phenomenon was Stochastic Resonance, which is provided as a plausible explanation to earth ice-age recurrence. Further it is observed in many engineering systems. The idea of the paper is two fold: (i) To show noise when used in controlled fashion can be beneficial, and (ii) To generalize...
Intentional islanding describes the condition in which a micro grid or a portion of the power grid, which consists of a local load and a distributed generation(DG) system, is isolated from the remainder of the utility system. In this situation, it is important for the micro grid to continue to provide adequate power to the load. The DG unit utilizes a voltage sourced converter (VSC) as the coupling...
The price of fossil fuels is constantly escalating. Fossil fuels are also the major cause of air pollution and global warming. Renewable energy sources appear to be a suitable alternative as they are abundant and pollution free. However, the major drawback of replacing fossil fuels completely with renewable energy sources, especially solar energy, is that the renewable energy sources tend to be inadequate...
Bicycle is a high efficiency transportation tool without any environmental burden. However, it has the inherent disadvantage that, it is unstable by itself and human assisted control is necessary for its stable running. In this paper optimal control methods are proposed for the stabilization and tracking of an electric bicycle. In the proposed method a self sustaining control of electric bicycle using...
Moving target tracking is extremely relevant in applications like surveillance or chasing an enemy target. In this paper we propose a modified PN guidance law based moving target tracking system. The moving target tracking algorithm has been initially tested in simulation and then implemented using a differentially driven mobile robot. The kinematic model of the robot is taken in to account while...
This paper presents a method for sensorless rotor position detection of BLDC drive based on Back EMF which is indirectly obtained from motor terminal voltages along with PWM switching noise. Low pass filter is used to eliminate high frequency noise. The low pass filter used in position detection circuit also produces phase lag on back EMF signal which deteriorates the accuracy. This phase lag problem...
Single phase matrix converter has been developed to perform the functions of all operations in one converter that is a single circuit is developed that can perform cycloconverter, cycloinverter, ac voltage regulator, rectifier, inverter, chopper operations. The well-known sinusoidal pulse width modulation is used to synthesize the output. IGBT with antiparallel diode is used as a switching device...
In the recent years, with increase in the nonlinear power electronic devices in every sphere, it has given rise to two important limitations; harmonics generation and lagging current from the utility. In addition to these, the other power quality problems have appeared in the system that reduces the overall efficiency of the system. In this paper, unified power quality conditioner (UPQC) has been...
Speaker Recognition is an active area of research for the last few decades for its applications in several national security, and other forensic applications. In this work, we present the details of a speaker recognition system developed using universal background model and support vector machines(UBM-SVM). We explored several techniques to improve the performance of the baseline system developed...
Ac rail traction has become an important part of the power scenario. Negative sequence and harmonic current have become the main issues in high speed ac train traction system. AV/V traction transformer has been adopted for power supply to the traction. Railway static power conditioner (RPC) has been developed to mitigate the power quality issues. A comprehensive technique for compensation of negative...
A Flywheel Energy Storage (FES) system consists of a rectifier, dc link, a bi-directional converter (BDC) connecting the dc link to a Brush-less DC (BLDC) machine coupled to a flywheel. The BLDC machine which is used in an FES system is one of the critical sub systems. This machine acts as a motor when energy is being stored in the flywheel and as a generator when the same energy is being harvested...
Distance relays are sensitive to the power swings. So these are blocked during power swing to ensure reliability of the power system. However, if a fault occurs during a power swing, distance relay must operate to clear the fault with a high degree of selectivity and sensitivity. This paper presents a new symmetrical fault detection techniques during power swing based on differential three-phase instantaneous...
With the advent of real time Phasor Measurement Units (PMUs), synchronised phasor measurements are possible which allows monitoring of dynamic phenomena. PMU terminals installed in proper nodes of power systems enable increasing the transmission capacity. Also it improves the operational safety of the power system. The better measurement performance and system wide data for monitoring and presentation...
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