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Inverters designed using reduced number of semiconductor switches are of great importance to the industry because of their lower cost and enhanced reliability linked to their less complex gating and control circuitries [1]. In this paper a four switch three phase (b-4) topology for the grid connected application in an effort to reduce the cost of the inverter is investigated. This topology warrants...
Here, a single-stage single-switch AC/DC converter is analyzed. It integrates a buck converter for power factor correction and buck-boost converter for voltage regulation. Because of buck converter, intermediate bus voltage is less and it leads to less component stress. Absence of transformer leads to less component count and cost. Due to direct power transfer feature, high conversion efficiency is...
Multifunctional Grid Connected Inverters (MFGCIs) are playing a crucial role in improving the power quality in Micro grids. This paper focuses on the transient and steady state performance of a current controlled Multifunctional grid connected inverter to improve the grid current quality when connected to nonlinear loads. The multifunctional grid connected inverter incorporates active filter functionality...
In this paper, a two machine three bus power system network is considered initially. This is simulated in Phasor simulation method. Power and voltage outputs are initially considered. The system is then subjected to 3 phase and single phase to ground fault. The system shows unstable operation, after the application of faults A STATCOM is then connected and improvement in system performance is noted...
The increase in population results the scarcity of land and electricity. The development of lands in rural areas affects the installation of new generating stations. The effective usage of solar energy helps to reduce the demand of electricity in rural areas. The rooftops are used for the generation of solar energy and it is of limited area. In such cases a three layer solar panel arrangement is proposed...
Blackouts in large interconnected power system can cause damage to equipment of power plants, interruption of production cycles, and great economic losses. In order to avoid these blackouts from occurring in the power system, an effective forced islanding scheme with a suitable load shedding scheme can be used. This paper proposes an algorithm that identifies the risk during an outage and forcefully...
Power systems are getting complicated as load centers get connected through network thus forming power grids. Since then black outs of power systems have become common. In an interconnected system, the loss of generation in one area can be replaced by generation from other areas. Thus, several systems interconnected can survive contingencies that the individual systems could not. Thus one benefit...
Wind energy is the fastest growing renewable energy source. In wind power market Double Fed Induction Generator, is popular wind turbine system due to its reduced mechanical stress and high efficiency compared to others. But it is very sensitive to grid disturbances and can damage the power electronic converters connected to the machine due to over voltage and over current due to fault ride through...
Vibration damping on a protected mechanism resonance frequencies is best carried out by hydromounts with managed damping ratio. Such hydromounts have a magnetorheological transformer. The magnetorheological transformer working pattern is controlled by semiconductor converter.
HVDC transmission technology is an efficient alternative for bulk power transmission over long distances and is used for subsea electrical transmission and interconnection of asynchronous ac grids. Converters play an important role in HVDC transmission systems. Here a Bidirectional Buck Boost Inverter based HVDC (BBI-HVDC) transmission system is presented. The output voltage and current of the new...
Power quality deterioration due to the increased use of power electronic switching devices has become a major problem faced by electrical engineers. Various power conditioning devices such as FACTS devices are developed for power quality improvement. Among them Shunt Active Power Filter (SAPF) is used for harmonic current compensation. SAPF supplies the reactive power required by the nonlinear load...
Microgrid constitutes distributed energy resources (DERs), storage devices and controllable loads. In microgrid applications challenge mainly lies in the integration of Distributed Energy Resources (DERs) through power electronic interfaces. With proper control of inverter switching, seamless transfer from power control mode to voltage and frequency control mode is possible. The paper proposes a novel...
In this paper a new control algorithm for self-supported Dynamic Voltage Restorer (DVR) is analysed. DVR is used to mitigate the power quality problems in terminal voltage like voltage sag, swell, harmonics etc. Here two PI (Proportional Integrator) controllers are used for regulating the DC bus voltage and the load voltage. The focus of this paper is to reduce the active power injected by DVR. Synchronous...
This paper is focused on the design of the Fuzzy Sliding Mode Controller (Fuzzy SMC) for the Speed control of Permanent Magnet Synchronous Motors (PMSM) with Triangular and Gaussian fuzzy membership functions. PMSM are widely used in industrial applications such as robotic manipulators and machine tools due to its high efficiency, high torque to weight ratio and smaller size. One of the efficient...
This paper presents an image denoising algorithm that uses non local means algorithm together with Weiner filter. The presence of noise halo or rare patch effect in non local means denoised image occurs as a result of large variance between pixel values near the edges. This large variance is reduced by deliberately adding a small amount of blur near the edges before applying non-local means denoising...
The following paper proposes two overcurrent protection schemes that are applicable for limiting the current through the main switching devices in Bridge type Inverters under shoot-through conditions. Under normal mode of operation, the high side and low side switches of the bridge converters conduct on alternate half cycles. During the commutation if the conduction states overlap the source will...
This paper presents a novel method for brain tumour segmentation which unifies two different models. The segmentation procedure goes through three stages. First stage employs an Extended Hyperbolic Tangent (EHT) model to separate natural cells from deceased ones. Second stage makes use of fuzzy clustering technique to sharpen the separation done in the previous stage. The final stage isolates tumour...
This paper presents direct torque control (DTC) scheme for an induction motor (IM) fed from four switch three phase inverter (FSTPI) using simple structured artificial neural network for switching vector selection and is conceived to be a commercially viable solution having low cost, high efficiency and robustness. By comparing the proposed scheme with conventional DTC for IM fed from six switch and...
Miniature and bio mimicking robots cannot be equipped with conventional electromechanical actuators due to larger size and weight. Shape Memory Alloys (SMA) are a potential choice in such systems. Large deflection systems are designed using SMA helical springs. Temperature induced phase transformation causes the strain in such systems. In bio mimicking and bio inspired designs, SMA's are often considered...
This paper deals with the simulation of a vector controlled three phase rectifier designed to give UPF operation. A brief review of different control strategies are also given. The main issue with the use of conventional bridge rectifiers/controlled rectifiers is the injection of unwanted harmonics into the gird. The input current will be highly distorted and out of phase. Due to various harmonic...
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