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This paper describes the influence of the graded air gap on the performance of a salient pole synchronous generator in terms of total harmonic distortion and air gap flux density waveform. Feasibility of redesigning an existing product to include the feature is also briefly discussed. The main focus of this investigation is the THD improvement for a skewless machine and the required increase in the...
The ACOPF is at the core of competitive electricity market design. It is the only ac-based algorithm that simultaneously co-optimizes real and reactive power dispatch for steady-state operations on ac power systems. In practice, independent system operators (ISOs) oversimplify the physical problem and settle the markets on locational marginal price (LMPs) based on real power but do not price reactive...
Background/Objectives: Domino logic designs are widely used owing to its high speed and less area. However, the on chip variation of the design becomes more severe on scaling down the technology nodes. Methods/Statistical analysis: This paper details the design of variation tolerant domino logic with novel keeper architecture which comprises of a stacked grounded keeper with a body-bias generator...
Background/Objective: Energy recovery is one of the most promising methods for low power design methodologies. The main idea behind the energy recovery circuits is the use of a slowly rising and slowly falling AC power supply i.e., sinusoidal or trapezoidal clock signal. Hence, it is essential to design low power clocking schemes for such energy recovery circuits. This paper presents an efficient...
A single phase seven level inverter topology with fewer components using proportional integration controller is presented in this paper. The pulse width modulation is employed to generate gating signals for power switches. The proposed topology can be implemented for three phase application. The Separate dc sources can be replaced by solar PV arrays. The complete system is simulated using MATLAB/SIMULINK...
In recent years, the electronic systems become more complex due to high integration of multi-system functionalities with deep submicron technologies. Also, the insistent requirements of analog and mixed-signal circuits like precision output and observability of logic functions are limited due to the high integration density and limited availability of input-output pins. And it makes the testing of...
An increase in the decentralization of power generation, it has become necessary to study the effects of distributed generation and propose a suitable modification to the protection system to increase the reliability. The paper focuses on the effect of distributed generation on the quality of power at any location concerned due to faults occurring on the power system. The waveforms of the currents...
Accurate and realistic Economic Load Dispatch (ELD) is one of the most important issues in power systems. In real conditions, ELD is limited to the different non-equal constraints that make ELD a non-convex and non-smooth problem. This makes it difficult to find a global optimized solution, even with the aid of classic mathematical methods. In this paper, a novel procedure is presented for solving...
This paper presents the Perturbation and Observation (P&O) algorithm as Maximum Power Point Tracking (MPPT) method for the transient and steady-state analysis of DC series motor fed from Photovoltaic (PV) generator at different solar irradiance levels and various motor loading conditions. At each solar intensity, the maximum power point of Voltage/Current (V/I) characteristic of the PV generator...
This paper proposes a coding scheme that derives a multiple-rate code from existing channel codes defined over the composite field and the ground field, where code length is fixed. Formally, from codes C1(k, 1), C2 (k, 2),…, Ck(k, k) defined over GF(q) together with the code C(n,k) over GF(qn), the proposed scheme derives a multiple-rate code with fixed code length. The primary benefit of the proposed...
In this paper a novel CMOS temperature and supply voltage independent current reference has been proposed. This design is based on subtraction of two scaled version PTAT (proportional to temperature) currents to get temperature independent current reference. Implemented in 45nm CMOS technology and simulated with Spectre. Simulation results shows that the proposed current reference achieves temperature...
A novel, efficient multilevel inverter topology has been proposed which generates the seven level output voltage using seven power switches only along with simple and modern pulse width modulation technique. This inverter has offered the advantages of, less component count, reduced switching loss, high efficiency and low cost. Due to the less number of switch components the complexity in generation...
In most developing countries, for the proper utilization of solar energy the system designed should be optimized. This paper presents the design and analysis of photovoltaic (PV) system to supply electricity. A stand-alone optimization simulation model is developed using the HOMER software. The radiation data for Baru Sahib, H.P. is collected for the every month of the year. Simulation model is used...
Energy is very important for a country for both its economic growth and socio-economic development. The main source of energy is fossil fuels. However, the use of fossil fuels has severe effects on environment like emission of greenhouse gasses. These diverse effects have leads to the demand of renewable energy resources. Renewable energy sources like wind, solar, hydro based energies, etc. are environment...
With the increasing demand of electricity, many countries have been moving towards interconnecting the renewable energy to the existing power grid. In this framework, photovoltaic energy has been most popular. In this work, the impact of grid connected photovoltaic (PV) on the system transient stability is assessed by numerical simulation using matlab/simulink. The effect of under voltage ride through...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
In this paper an UWB impulse radio transmitter for a low-power wearable respiration monitoring sensor is proposed. The transmitter operates in the 3.1 to 5 GHz oscillation frequency range with a tunable channel bandwidth of 0.8 – 1.3 GHz. Implemented in a standard 130-nm CMOS process the proposed transmitter follows on-off keying (OOK) modulation scheme and consumes an average power of 8.2 µW with...
In this paper, a three phase delta connected self-excited induction generator (SEIG) excited by two capacitors and feeding a single phase load is investigated in both transient and steady state cases. Using symmetrical components analysis, two simple formulas are derived to calculate the required values of the two capacitors that result in balanced stator phase currents under rated conditions, which...
The paper considers various methods of hardware fixed-point chaos generators construction. Some techniques of scaling of several difference schemes for ordinary differential equations (ODE) solving to the fixed-point data types are described. The experimental results for the set of generators based on the Rössler system in the time and phase domain are provided. On the basis of the obtained experimental...
The underwater pulsed arc discharge is one of the effective methods in water treatment applications. In pulsed arc discharge, a pulsed output in the range of 1–10 kV is typically applied across the water treatment chamber electrodes with a gap of several millimeters range between these electrodes, while the pulsed load current is above 1kA. The employed pulse generator should not only be capable of...
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