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Space vector pulse width modulation (SVPWM) technique has emerged as a most used modulation strategy for the voltage source inverter (VSI) fed AC motor drives. SVPWM is a method of pre-calculation of switching timing instants for various sections of target output which has options in terms of positioning vectors inside every sampling interval and has six possible patterns (variants) ofthe voltage...
This paper introduces a new switching technique for non-inverting synchronous buck-boost converter. It is operated at high efficiency during buck, boost and buck-boost mode. The design of the system was implemented using PSIM. Performance of the proposed system for various load current and input voltage condition was investigated during all modes. Simulation results prove that the new switching method...
The power quality problem occurs due to the nonlinear load connected in the system. There are different methods have been used for reducing harmonic contents in the system. Among them optimization technique and shunt active power filters are commonly used method. But, the optimization technique is only suited for eliminating the higher order harmonics, whereas in shunt active power filters, solving...
The inverter in conventional BLDC motors use hard switching technique, due to which it has low switching frequency and high losses. Active Clamp resonant DC link is proposed to use with BLDC motor. In this paper the performance of BLDC motor using ACRDCL inverter and conventional RDCL is analyzed. The simulation results are found to be in agreement with the expected outcome
Selective harmonic elimination (SHE) low switching frequency pulse width modulation (PWM) is the viable option to voltage source inverter (VSI). This paper presents an adaptive filtering algorithm for the selective current harmonic elimination in voltage source inverter (VSI) fed drive system. The algorithm used for the proposed adaptive selective harmonic elimination (ASHE) is based on Recursive...
Multilevel Inverter (MLI) is the advanced power electronic inverter circuit which is most commonly used for producing higher output voltage levels for the drive system applications. Different topologies of multilevel inverter have been reported in the literature, but this paper mainly focuses on the asymmetrical cascaded multilevel inverter circuit with reduced number of input DC sources. This paper...
This paper presents the modeling and simulation of a dynamic voltage restorer as a voltage sag/swell mitigation device in electrical power distribution networks. The dynamic voltage restorer, with its excellent dynamic capabilities, when installed between the supply and a critical load feeder, can compensate for voltage sags/swell, restoring line voltage to its nominal value within few milliseconds...
Hysteresis pulse width modulation has different application because of its unmatched dynamic response and wide command tracking bandwidth. The various hysteresis modulation schemes are available in literature for multilevel inverter. The techniques are desired and compare the reference signal to obtain the adequate switching frequency, excellent dynamic response and high accuracy in steady state operation...
The differentiated services (DiffServ) framework provides a simple and scalable methodology for addressing quality of service issues in IP networks. Service differentiation can be achieved through the assured forwarding (AF) per hop behavior packet handling scheme. One of the more challenging research issues in DiffServ networks is the fair distribution of bandwidth among aggregates sharing the same...
The paper presents method for the sensorless control of the Switched Reluctance Motor (SRM). Method development is motivated by the requirement of accurate rotor position to support optimize control and excitation for the SRM. Proposed method connects the magnetic characteristics of the motor to an analytical expression to estimate the rotor position. A step-wise procedure is present to maps the magnetic...
This paper presents a direct flux and torque control (DTC) of induction motor drive (IMD) for speed regulator (SR) using fuzzy logic controller (FLC). This control method is based on DTC operating principles. The DTC is one of the most excellent strategies of torque and flux ripples control of IMD. The DTC control method has been optimized by using conventional PI controller in the SR loop of IMD...
A buck converter is a step-down AC to DC converter. By eliminating input bridge diodes, the rectifier's efficiency is further improved. More over the rectifier doubles its output voltage which extends usable energy of the buck capacitor after a drop out of the line voltage. In conventional method a bridgeless buck rectifier also works as a voltage doubler, it can be designed to meet harmonic limit...
The work presented in this paper performs a comparison between three types of controllers, namely fuzzy logic controller, fuzzy PI controller and Particle Swarm Optimization (PSO) based tuning of Fuzzy PI controller to control the speed of three phase Switched Reluctance Motor. The main objective is to obtain better performance of the system in stability, without overshoot and minimum settling time...
During the last few years, emission control has become a problem of global concern due to the constantly increasing pollution of earth's atmosphere. The generator company objectives are to maximize their profit. The traditional generation scheduling problem aims at minimizing the cost of operation subject to fulfillment of demand. Under new structure, generation companies (GENCOs) schedule their generators...
Static Synchronous Compensator (STATCOM) is one of the typical FACTS device which is used to improve the voltage profile and transient stability in power system by damping the low frequency oscillation in it. This paper presents a self tuning PI controller for STATCOM in which the PI controller gains are adopted with the system load impedance by Back Propagation Algorithm. In order to overcome the...
The dc link voltage of the unified power quality conditioner (UPQC) is maintained at certain preset value during the steady state. However the dc link voltage can significantly deviate from its reference during a transient event, caused by load connection/disconnection or/and supply side voltage sag/swell. During such transients, due to significant deviation in the dc link voltage, the series injected...
This paper presents a low peak power consumption BIST based on genetic algorithm (GA) is applied for viterbi decoder error detection and correction, denoted by GAITPGEDC. This method aims at reducing the changes between successive test pattern. Here m-1 test vectors are inserted between two successive n-bit generated by linear feedback shift registers (LFSR), where m and elements of group were optimized...
A space-vector pulse width modulation (SVPWM) switching strategy is described in this paper. A four-level voltage waveform using open-end winding configuration of an induction motor is obtained by using this strategy. Two unequal DC-link voltages, which are in the ratio of 2∶1 are used to generate the SVPWM based four level voltage wave forms. The proposed algorithm does not employ any look-up tables...
Multilevel inverters have gained interest in recent years in high-power medium-voltage industry. This paper considered the most popular structure among the transformer-less voltage source multilevel inverters, the diode-clamped inverter based on the neutral point converter. This paper use conventional switching sequence and optimum switching sequence of SVPWM technique. Simulation results presents...
This paper, deals with an Adaptive based Switching Bilateral Filter for removing universal noise in highly corrupted image. In contrast with the previous approach where blurring occurs while filtering the entire image without considering the uncorrupted pixels, which is reduced here by using Adaptive Median Filter with binary vector (BV). Operation carries in three stages. At first an Adaptive Median...
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