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This paper covers the modelling of the standard IEEE 14 bus system using the MATLAB package. The basic system is tested under large and small disturbances to study the dynamic behaviour of the system and the stability margins associated with the different configurations of the system. As a suggested solution to increase stability margins of the system, Sen transformer is added, modelled and tested...
Increasing demand of portable devices creating larger scope in the field of Low power device design. VLSI designing of the efficient circuits is aiming towards the devices consuming less power and produces less delay with capability to operate in wider range of frequencies. This research paper proposes the modified Single Edge Triggered (SET) D-flip flop design for the low power applications. The...
NMR Research Centre of INMAS has developed an in-house Helmholtz coil. It will be used as a component of the system for hyperpolarizing Xenon gas for MRI application. The system will be helpful in imaging low proton density area of the body such as lungs efficiently. This paper describes the mathematical approach for designing the Helmholtz coil. Structure geometry, number of turns in winding and...
The speed and position estimation from Back EMF has been a problem under speed reversal response due to change of sign of speed. In this paper, an algorithm using fuzzy logic is proposed to estimate the speed and position of BLDC motor from back EMF for sensorless brushless DC (BLDC) motor drives to improve the performance of conventional sensorless drives. Most existing sensorless methods of the...
In this paper, we present an embedded platform for real-time emulation of nonlinear electrical circuits in an embedded processor. Electrical systems, if complex, are better implemented if split into number of tasks. These tasks will have different priorities and timing deadlines and hence must be managed by an Operating System. We present and evaluate an iteration time based adaptive time step scheduling...
In this paper a digital voltage-mode controller design methodology is proposed for the fourth order split inductor converter load voltage regulation. The salient features of the split-inductor converter are compared with the conventional SEPIC converter and then discrete-time mathematical models are established. Digital single-loop voltage-mode controller is designed using direct digital design approach...
Different control strategies for shunt active power filter (APF) are reported in literature several of them have satisfactory response under normal operating conditions, but there is still some confusion regarding the preferable controller for the shunt APF under normal and fault conditions. This paper evaluates the performance of shunt active filter for two different control strategies namely Hysteresis...
DC-DC converters are the heart of any switched mode power supply (SMPS) system. Rather than using multiple number of DC-DC converters for regulating voltage of each of the outputs in a multi-output SMPS, the reliability and cost-effectiveness can be improved if a single DC-DC converter is used and viable control technique is employed to regulate the voltages effectively. This paper deals with such...
Almost as long as rechargeable batteries have existed, systems able to give an indication about the state-of-charge (SoC) of a battery have been around. Several methods, including those of direct measurements, bookkeeping and adaptive systems are known in the art for determining the SoC of a cell or battery of cells. An accurate SoC determination method and an understandable and reliable SoC display...
Interharmonics are spectra components whose frequencies are not integral number of the supply fundamental frequency. When a voltage waveform contains interharmonics, the root mean square (rms) and peak magnitude of the waveform will fluctuate. This is because the periods of the interharmonic components are not synchronous with the fundamental frequency cycle. This fluctuating magnitude is essentially...
The Wind Industry has been focusing more on offshore wind farms for the last 10 years. Since from the commercialization, the wind industry has been changing towards market trends and become market driven too. Current research is focusing on, how to reduce the downtime due to the system components like gearbox and environment conditions like harsh weather and inaccessibility factor. A suitable means...
This paper presents brief investigations on performance of Installed Thyristor Controlled Series Compensator (TCSC) projects world around. The main and basic objective of TCSC's in power system is to enhance power flow and improve system stability. The deployment of TCSC in transmission line also improves SSR mitigation, Power Oscillation Damping (POD) and Transient Stability (TS). The paper intends...
This paper presents the speed control scheme of indirect vector controlled induction motor (EVI) drive. Voltage source inverter type space vector pulse width modulation (SVPWM) is used for PWM controlling scheme. An intelligent based on Fuzzy PI controller is developed for controlling the torque component Iq current of an EVI. The complete vector control scheme of the IM drive incorporating the FLC...
This paper highlights the voltage sag and swell of the power quality issue and Unified power flow controller (UPFC) is used for mitigation. The switching level model is constructed using three phase six pulse shunt and series converters. Both the converters are modeled as back to back voltage source inverters connected with the D.C link are controlled by sinusoidal pulse width modulation scheme. This...
It has been observed that adoption of different possible switching patterns/schemes affects the transient behaviours such as phase current and torque of a PMBLDC motor. Four possible switching patterns are achieved by modulating only upper/lower switches and incoming/outgoing phase switches. For the purpose of control of PMBLDC motor low cost ATMEGA 32 micro-controller is used to generate all the...
Thyristor controlled series compensator (TCSC) device is a series compensator to govern the power flow by compensating the reactance of the transmission line. Both capacitive and inductive reactance compensations are possible by proper selection of capacitor and inductor values of the TCSC device which can be realized through reactance equation. This paper presents a conceptual study to adopt an apt...
PMSM drives are the upcoming drives nowadays as these have many advantages such as high efficiency, high speed, high torque to inertia ratio, high torque to current ratio etc., The estimation of PMSM drive parameters is an important consideration in their field. Many methods are available for this. However the optimal way to estimate the parameters is normally preferred making use of neural networks...
This paper presents the concept of utilizing photovoltaic (PV) solar farm (SF) as flexible ac transmission system controller-static synchronous compensator, to regulate the point of common coupling voltage during night time when the SF is not producing any active power. The proposed control will enable increased connections of WECS to the grid. MATLAB/Simulink based simulation results are presented...
A couple of decade ago when auto engineers decided to increase the voltage level of electrical power system drive, it was the advancement of silicon technology supporting their dream. Today the power electronics circuits play an important role in the success of electric, hybrid and fuel cell vehicles. Typical power electronics circuits in hybrid vehicles include electric motor drive circuits and DC/DC...
The Static Synchronous Compensator (STATCOM) is increasingly popular in power quality application. The Voltage Source Inverter (VSI) based STATCOM is used for eliminating current harmonics and compensating reactive power. This VSI draw or supply a compensating current from the utility such that it cancels current harmonics on the AC side. STATCOM generates a current wave such that it compensate by...
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