52 results for qubit oscillator frequency
POWER OSCILLATION CONTROL IN POWER SYSTEM BY ANFIS BASED UNIFIED POWER FLOW CONTROLLER ALONG WITH STABILIZATION
Contributors: Chitrasen Gabel*, Dr. Dharmendra Kumar Singh
frequency disturbances are mainly; Loss of synchronism which might be ...frequency disturbances which are typically in the frequency range of 0.2...frequency oscillations . The ANFIS based stability enhancement accuracy...frequency disturbance occurred in power system. ...frequency disturbance in the power line operation. Various techniques ... In the present era, the power system has become a vital part to provide stability enhancement. The stability of a power system depends on how low frequency disturbances which are typically in the frequency range of 0.2 to 3.0 Hz, accurately find out and cleared so that quick restoration and maintains a stability enhancement of power is accomplished. Loss of synchronism and stability enhancement are needs to be performed using ANFIS controlled based excitation of power system . The significant factors which affect the operation of power system during the occurrence of low frequency disturbances are mainly; Loss of synchronism which might be excited by the disturbances in the system or, in some cases, might even build up spontaneously. These factors can be analyzed to find out the occurrence of the low frequency disturbance in the power line operation. Various techniques like Power System Stabilizer with algorithm based or logic controlled based, UPFC has been used in past to find out and cleared the different low frequency disturbances occurred in the transmission line. The proper selection of enhanced feedback is a very tedious and time consuming task and also requires brief knowledge of the system configuration. To avoid the drawbacks of conventional power system stabilizer with algorithm or logic controller based techniques, this dissertation proposed, an efficient and robust technique of stability enhancement using ANFIS based power system excitation. The advantage of the proposed technique is that; it improves the overshoot of power and reduced the time for low frequency oscillations . The ANFIS based stability enhancement accuracy of proposed technique has been verified using MATLAB/Simulink 2013(a) software. The obtained results show that the proposed technique is efficient in stability enhancement of all type of loss of synchronism and hence reliable tool for low frequency disturbance occurred in power system.
Contributors: Sergio Pinna, Suzanne Melo, Francesco Laghezza, Filippo Scotti, Emma Lazzeri, Mirco Scaffardi, Paolo Ghelfi, Antonella Bogoni
oscillator assure very low system phase noise and phase coherence among...oscillators. The ultra-wide band and high stability of photonics and the...frequency span up to 7.4GHz. The high coherence among the two frequency...oscillator that replaces the conventional cascades of electrical local...frequency continuous waves simultaneously in the S- and X-band, measuring ... Photonics-based multiband radars have been demonstrated where photonics is exploited for multiple RF signal generation and detection by means of a single optical local oscillator that replaces the conventional cascades of electrical local oscillators. The ultra-wide band and high stability of photonics and the use of a single local oscillator assure very low system phase noise and phase coherence among the RF signals. This phase coherence among multi-band signals is exploited to perform differential phase estimation in enhanced sub-millimeter displacement measures. The system employs stepped frequency continuous waves simultaneously in the S- and X-band, measuring the differential phase over a frequency span up to 7.4GHz. The high coherence among the two frequency bands, provided by the photonic architecture, enables very precise displacements measures, allowing to obtain sub-millimeter precision without using correction algorithms. The presented experimental results demonstrate a precision < 200m in a range up to 3km. Moreover, the sharing of the same hardware to handle a multi-band operation allows a great reduction of size, weight, power and footprint of the overall system.
MEASUREMENT ANALYSIS OF FLUCTUATIONS BETWEEN POWER GRID AND CONSUMERS AT LOW VOLTAGE AND HIGH FREQUENCY RANGE
Contributors: Avinash Raj *, Deepanshu Saini
frequency range with being of voltage dips about magnitude of voltage ...frequency harmonics about of some kilo hertz’s. At high frequency range...Frequency Analysis....oscillations during recurrent. This is the major precision in values to...frequency range. In this dissertation report, implemented the frequency range measurement techniques in time domain and frequency domain ... The quality of energy is a matter to get a many more information from last four decades to industrialize interaction with the power grids and customers to use of instruments supported in its at representation in voltages and currents. The implementation in this field has to relatively slow at low frequency range with being of voltage dips about magnitude of voltage in milliseconds and frequency harmonics about of some kilo hertz’s. At high frequency range the modern energy equipments included in power grid system with grid communication like meter readings and controls at same frequency range. In this dissertation report, implemented the frequency range measurement techniques in time domain and frequency domain both to use of fluctuated waveforms and key of measurement factors will fluorescent light. So due to limit of harmonics will use high switching method and get more frequent use in all other small energy instruments for precision of emission and immunity systems. Reaction mechanism of fluctuations from frequency range will define several methods like narrowband, wideband and oscillations during recurrent. This is the major precision in values to understand the standard of thesis work.
frequency clearly indicates the impacting nature of the process and captures...oscillations. (For interpretation of the references to color in this figure...high-frequency repeating impacts in robotic grinding (detailed views)....frequency in single-pass grinding (overview). (For interpretation of the...frequency...frequency in Test (3) at 4500rpm. (For interpretation of the references...high-frequency impacts that mainly last for only a small fraction of the ... In a robotic machining process, a light-weight cutter or grinder is usually held by an articulated robot arm. Material removal is achieved by the rotating cutting tool while the robot end effector ensures that the tool follows a programmed trajectory in order to work on complex curved surfaces or to access hard-to-reach areas. One typical application of such process is maintenance and repair work on hydropower equipment. This paper presents an experimental study of the dynamic characteristics of material removal in robotic grinding, which is unlike conventional grinding due to the lower structural stiffness of the tool-holder robot. The objective of the study is to explore the cyclic nature of this mechanical operation to provide the basis for future development of better process control strategies. Grinding tasks that minimize the number of iterations to converge to the target surface can be better planned based on a good understanding and modeling of the cyclic material removal mechanism. A single degree of freedom dynamic analysis of the process suggests that material removal is performed through high-frequency impacts that mainly last for only a small fraction of the grinding disk rotation period. To detect these discrete cutting events in practice, a grinder is equipped with a rotary encoder. The encoder's signal is acquired through the angular sampling technique. A running cyclic synchronous average is applied to the speed signal to remove its non-cyclic events. The measured instantaneous rotational frequency clearly indicates the impacting nature of the process and captures the transient response excited by these cyclic impacts. The technique also locates the angular positions of cutting impacts in revolution cycles. It is thus possible to draw conclusions about the cyclic nature of dynamic changes in impact-cutting behavior when grinding with a flexible robot. The dynamics of the impacting regime and transient responses to impact-cutting excitations captured synchronously using the angular sampling technique provide feedback that can be used to regulate the material removal process. The experimental results also make it possible to correlate the energy required to remove a chip of metal through impacting with the measured drop in angular speed during grinding.
Contributors: V Sanjeeva Rao*, Dr B V Sanker Ram
frequency oscillations. This paper addresses an intensive literature review...oscillation damping controller in grid that area unit grid stabilizer ... There are a unit 2 forms of oscillation damping controller in grid that area unit grid stabilizer (PSS) and versatile ac transmission systems (FACTS). Numerous works are administered on the damping of grid low frequency oscillations. This paper addresses an intensive literature review on coordination drawback in single-machine and multi-machine grid. It conjointly reviews numerous forms of FACTS controllers. Numerous ways area unit projected so as to enhance the dynamic performance of an influence system for coordinated management between FACTS and PSS controller in power system models.
Contributors: Calero, David, Fernández, Enric, Parés, M. Eulàlia
oscillator, such as TCXO (Temperature Compensated Crystal Oscillator) ...frequency stability and a poor accuracy, being one of the main sources...frequency stability in the positioning estimation process. The procedure...frequency stability clock such a CSAC (Chip Scale Atomic Clock) can improve ... Current GNSS (Global Navigation Satellite System) receivers include an internal quartz oscillator, such as TCXO (Temperature Compensated Crystal Oscillator) or similar, limited by its frequency stability and a poor accuracy, being one of the main sources of uncertainty in the navigation solution (also multipath and ionosphere effects are an important error sources.) Replacing the internal TCXO clock of GNSS receivers by a higher frequency stability clock such a CSAC (Chip Scale Atomic Clock) can improve the navigation solution in terms of availability, positioning accuracy, tracking recovery, multipath and jamming mitigation and spoofing attacks detection. For achieving these benefits, the deterministic errors from the CSAC need to be modelled, by determining and predicting the clock frequency stability in the positioning estimation process. The procedure of calculating a position without the need of estimating continually the clock error parameter is also known as clock coasting. The presented research shows the potential of the clock coasting method in order to be able to obtain position with only three satellites, improve the vertical positioning accuracy and increase the navigation solution availability.
Contributors: Rego Costa, Artur, Débarre, Florence, Chevin, Luis-Miguel
frequency-dependent selection caused by competitive interactions mediated...frequency of chaos at each simulation time point for different values ...oscillating optimum for d = 70....oscillations of an optimal phenotype interacts with the internal dynamics...oscillations. In contrast, weak forcing can increase the probability of...oscillating optimum for d = 40. ... Among the factors that may reduce the predictability of evolution, chaos, characterized by a strong dependence on initial conditions, has received much less attention than randomness due to genetic drift or environmental stochasticity. It was recently shown that chaos in phenotypic evolution arises commonly under frequency-dependent selection caused by competitive interactions mediated by many traits. This result has been used to argue that chaos should often make evolutionary dynamics unpredictable. However, populations also evolve largely in response to external changing environments, and such environmental forcing is likely to influence the outcome of evolution in systems prone to chaos. We investigate how a changing environment causing oscillations of an optimal phenotype interacts with the internal dynamics of an eco-evolutionary system that would be chaotic in a constant environment. We show that strong environmental forcing can improve the predictability of evolution, by reducing the probability of chaos arising, and by dampening the magnitude of chaotic oscillations. In contrast, weak forcing can increase the probability of chaos, but it also causes evolutionary trajectories to track the environment more closely. Overall, our results indicate that, although chaos may occur in evolution, it does not necessarily undermine its predictability.
Contributors: Mira, Fermín, Llamas-Garro, Ignacio, Georgiadis, Apostolos, San Blas, A.A.
frequency of 22.1 GHz coming from the local oscillator. This device is ... This paper proposes a substrate integrated waveguide (SIW) 180 degrees hybrid coupler with an integrated filter. This device operates at 24.1 GHz for radar applications and the filter removes the frequency of 22.1 GHz coming from the local oscillator. This device is the RF passive part of a single balanced diode mixer. The passive part has been designed, fabricated and measured.
Contributors: Smith, Robert W., van Sluijs, Bob, Fleck, Christian
oscillations. In this work we present a generalised in silico evolutionary...oscillators, and by performing multi-objective optimisation to find a ...oscillators and feed-forward loops that are optimal at balancing different...oscillators for experimental construction.Conclusions: In this work we ... Background: Evolution has led to the development of biological networks that are shaped by environmental signals. Elucidating, understanding and then reconstructing important network motifs is one of the principal aims of Systems & Synthetic Biology. Consequently, previous research has focused on finding optimal network structures and reaction rates that respond to pulses or produce stable oscillations. In this work we present a generalised in silico evolutionary algorithm that simultaneously finds network structures and reaction rates (genotypes) that can satisfy multiple defined objectives (phenotypes).Results: The key step to our approach is to translate a schema/binary-based description of biological networks into systems of ordinary differential equations (ODEs). The ODEs can then be solved numerically to provide dynamic information about an evolved networks functionality. Initially we benchmark algorithm performance by finding optimal networks that can recapitulate concentration time-series data and perform parameter optimisation on oscillatory dynamics of the Repressilator. We go on to show the utility of our algorithm by finding new designs for robust synthetic oscillators, and by performing multi-objective optimisation to find a set of oscillators and feed-forward loops that are optimal at balancing different system properties. In sum, our results not only confirm and build on previous observations but we also provide new designs of synthetic oscillators for experimental construction.Conclusions: In this work we have presented and tested an evolutionary algorithm that can design a biological network to produce desired output. Given that previous designs of synthetic networks have been limited to subregions of network- and parameter-space, the use of our evolutionary optimisation algorithm will enable Synthetic Biologists to construct new systems with the potential to display a wider range of complex responses.
Contributors: Cliff Orori Mosiori
frequencies just like those under seismic wave interactions and this work...oscillations are expected to behave in cylinder carrying a suspended mass...oscillator in a cylindrical acoustic medium that allow such waves to be...Oscillations ... Free vibrating motion can take place in an acoustic media. This motion can be steady hence have constant periodic variations or unsteady and thus experience light damping or heavy damping. We give a modeled analysis of unsteady periodic motion of an oscillator in a cylindrical acoustic medium that allow such waves to be transmitted through them. This has been approached by calculating variation within the proposed boundary functions and boundary potentials. Limitations for these calculations have been done depending on the time, and how free oscillations are expected to behave in cylinder carrying a suspended mass. This work investigated motion by constructions that interact with their environment with the acoustic media. Since the dynamics considered here were very complex, modeling the system with one grade of free motion and applying different types of constructions whether ground, underground, cylindrical, spherical constructions and containers was considered. This work borrowed heavily on the modeling of seismic and blast waves as modeled with rigid inclusions containing elastically fastened mass interacting continuous solid medium. This study joined motion of any continuous medium with other discrete systems. The results displayed measurement systems for wave processes having interference at their eigen- frequencies just like those under seismic wave interactions and this work considered the result as similar to those in discrete systems.