Charotar Institute of Technology

Changa, India

Charotar Institute of Technology

Changa, India
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Bhatt P.,Charotar Institute of Technology | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat | Ghoshal S.P.,National Institute of Technology Durgapur
Renewable Energy | Year: 2011

Increasing levels of wind generation have resulted in an urgent need for the assessment of their impact on frequency control of power systems. The displacement of conventional generation with wind generation will result in erosion of system frequency. The paper analyzed the dynamic participation of doubly fed induction generator (DFIG) to system frequency responses of two-area interconnected power system having variety of conventional generating units. Frequency control support function responding proportionally to frequency deviation is proposed to take out the kinetic energy of turbine blades in order to improve the frequency response of the system. Impacts of different wind penetrations in the system and varying active power support from wind farm on frequency control have been investigated. Integral gains of AGC loop are optimized through craziness-based particle swarm optimization (CRPSO) in order to have optimal transient responses of area frequencies, tie-line power deviation and DFIG parameters. © 2010 Elsevier Ltd.


Bhatt P.,Charotar Institute of Technology | Ghoshal S.P.,National Institute of Technology Durgapur | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat
Renewable Energy | Year: 2012

Among the several wind generation technologies, variable-speed wind turbines utilizing doubly fed induction generators (DFIG) are gaining momentum in the power industry. Increased penetration of these wind turbine generators displaces conventional synchronous generators which results in erosion of system frequency. With this assertion, the paper analyzes the dynamic participation of DFIG for frequency control of an interconnected two-area power system in restructured competitive electricity market. Frequency control support function responding proportionally to frequency deviation is proposed to take out the kinetic energy of wind turbine for improving the frequency response of the system. Impacts of varying wind penetration in the system and varying active power support from DFIG on frequency control have been investigated. The presence of thyristor controlled phase shifter (TCPS) in series with the tie-line and Superconducting Magnetic Energy Storage (SMES) at the terminal of one area in conjunction with dynamic active power support from DFIG results in optimal transient performance for PoolCo transactions. Integral gains of AGC loop and parameters of TCPS and SMES are optimized through craziness-based particle swarm optimization (CRPSO) in order to have optimal transient responses of area frequencies, tie-line power deviation and DFIG parameters. © 2011 Elsevier Ltd.


Bhatt P.,Charotar Institute of Technology | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat | Ghoshal S.P.,National Institute of Technology Durgapur
2010 IEEE 11th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2010 | Year: 2010

This paper examines the impact of increased penetration of doubly fed induction generator (DFIG) based wind power generation on frequency control of an interconnected two-area hydrothermal power system. The power electronic control of DFIG effectively isolates the inertia from the grid which will impose the serious threat to frequency regulation capability of the system. To mitigate the frequency stability problem, a frequency control support function is proposed which responds upon detection of network frequency excursion. A dynamic active power support by utilizing the rotational energy of the turbine blades has been obtained to arrest the initial frequency fall. Further, the effects of different wind penetration level and varying active power support from DFIG are analyzed on a market available multi-megawatt wind turbine generator. ©2010 IEEE.


Bhatt P.,Charotar Institute of Technology | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat | Ghoshal S.P.,National Institute of Technology Durgapur
2010 IEEE 11th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2010 | Year: 2010

This paper presents the Automatic Generation Control (AGC) of an interconnected two-area multiple-units hydrothermal system in a competitive electricity market. In the present competitive electricity market, various kinds of apparatus with large capacity and fast power consumption may cause a serious problem of frequency oscillation. The oscillation of system frequency may sustain and grow to cause a serious frequency stability problem if no adequate damping is available. Moreover, the larger amount of the steam stored in steam chest and reheater of thermal power plant and non minimum phase characteristic of hydraulic turbine delays the control valve motion to increase the mechanical power output after the load perturbation. So in order to stabilize the system, impacts of Static Synchronous Series Compensator (SSSC) in series with tie-line and Superconducting Magnetic Energy Storage system (SMES) at the terminal of area have been investigated. Integral gains of AGC loop and the parameters of SSCS and SMES controllers are optimized through craziness-based particle swarm optimization algorithm in order to have an optimal transient response of the system under different transaction in competitive electricity market. ©2010 IEEE.


Gohil P.P.,Charotar Institute of Technology | Shaikh A.A.,Sardar Vallabhbhai National Institute of Technology, Surat
Journal of Reinforced Plastics and Composites | Year: 2010

Interfacial interactions and interphases play a key role in all fiber reinforced composites. However, a clear distinction must be made between interface and interphase. Interphase becomes interface if its thickness decreases to zero. In most of the available micromechanical models the interface is considered perfect (no interphase). However, such a condition is hardly fulfilled in real composites. It is possible to find the volume of interphase by using DSC or identification of interphase region using SEM or some other sophisticated instrument techniques as it is a region created between the two main phase of a composite. All these techniques require special technical skill. In the present study attempt is made to identify the existence of the interphase region in fiber matrix composites using SEM. It was also decided to develop an equation for volume fraction and thickness of interphase by considering the composite as three-phase RVE. Developed equations of interphase volume fraction was used by considering the soft and stiff interphase parameters. Comparisons were made to study elastic behavior of fiber reinforced composites in longitudinal and transverse directions with available experimental data and published model in the literature and they are in good agreement. © 2010 SAGE Publications.


Bhatt P.,Charotar Institute of Technology | Ghoshal S.P.,National Institute of Technology Durgapur | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat
International Journal of Electrical Power and Energy Systems | Year: 2010

In this paper, automatic generation control with interconnected two-area multi-unit all-hydro power system and two more test systems as all-thermal and thermal-hydro mixed haves been investigated. The transfer function of hydro turbine having non-minimum phase characteristics makes it different from the steam turbine. Upon application of small load perturbation to such all-hydro system, the frequency is severely disturbed and the system eventually becomes unstable. To stabilize the system for such load disturbance, comparative transient performance of two cases as (a) Thyristor Controlled Phase Shifter (TCPS) installed in series with the tie-line in coordination with Superconducting Magnetic Energy Storage (SMES) and (b) SMES located at each terminal of both areas are analyzed. It is observed that the case (b) i.e. SMES located at each terminal of both areas suppresses the frequency oscillations more effectively in integral controller assisted AGC of two-area multi-unit all-hydro system and the other two systems as well. In addition, the effectiveness of proposed frequency stabilizers is guaranteed by analyzing the transient responses of the system with different system parameters, various load patterns and in the event of temporary and permanent tie-line outage. Gains of the integral controller in AGC loop and parameters of TCPS and SMES are optimized with the help of a relatively novel particle swarm optimization, developed by the authors, called as craziness-based particle swarm optimization (CRPSO). The optimizing performance has been compared to that of real-coded genetic algorithm (RGA) to establish its superiority. © 2010 Elsevier Ltd. All rights reserved.


Bhatt P.,Charotar Institute of Technology | Roy R.,Sardar Vallabhbhai National Institute of Technology, Surat | Ghoshal S.P.,National Institute of Technology Durgapur
International Journal of Electrical Power and Energy Systems | Year: 2010

This paper presents the comparative performance analysis of the two specific varieties of controller devices for optimal transient performance of automatic generation control (AGC) of an interconnected two-area power system, having multiple thermal-hydro-diesels mixed generating units. The significant improvement of optimal transient performance is observed with the addition of a thyristor-controlled phase shifter (TCPS) in the tie-line or capacitive energy storage (CES) units fitted in both the areas. Three different optimization algorithms are adopted for the sake of comparison of optimal performances and obtaining the optimal values of the gain settings of the devices independently. Craziness based particle swarm optimization (CRPSO) proves to be moderately fast algorithm and yields true optimal gains and minimum overshoot, minimum undershoot and minimum settling time of the transient response for any system. Comparative studies of TCPS and CES by any algorithm reveals that the CES units fitted in both the areas improve the transient performance to a greater extent following small load disturbance(s) in both the areas. © 2009 Elsevier Ltd. All rights reserved.


Bhatt P.,Charotar Institute of Technology | Bhatt P.,Sardar Vallabhbhai National Institute of Technology, Surat | Bhatt P.,National Institute of Technology Durgapur | Roy R.,Charotar Institute of Technology | And 5 more authors.
International Journal of Electrical Power and Energy Systems | Year: 2010

In this paper, the traditional automatic generation control loop with modifications is incorporated for simulating automatic generation control (AGC) in restructured power system. Federal energy regulatory commission (FERC) encourages an open market system for price based operation. FERC has issued a notice for proposed rulemaking of various ancillary services. One of these ancillary services is load following with frequency control which comes broadly under Automatic Generation Control in deregulated regime. The concept of DISCO participation matrix is used to simulate the bilateral contracts in the three areas and four area diagrams. Hybrid particle swarm optimization is used to obtain optimal gain parameters for optimal transient performance. © 2009 Elsevier Ltd. All rights reserved.


Pandya K.S.,Charotar Institute of Technology | Joshi S.K.,M. S. University of Baroda
Electric Power Components and Systems | Year: 2013

In the competitive electricity market, it is not always possible to discharge all contracted power transactions due to congestion in one or more transmission lines. In most cases, the independent system operator tries to remove congestion by rescheduling output power of the generators. But all generators do not have the same effect (sensitivity) on the power flow of the congested lines, so it is not an economical way to reschedule output power of all generators for managing congestion. Thus, in this article, active and reactive power generator sensitivity factors of the generators to the congested lines have been used to determine the number of generators participating in congestion management. Second, a particle swarm optimization based algorithm has been suggested to minimize the deviations of rescheduled values of active power and reactive power of generators from scheduled values, considering voltage stability enhancement and voltage profile improvement criteria. Thus, rescheduling costs of active power and reactive power were minimized by particle swarm optimization. The effectiveness and feasibility of the proposed algorithm have been tested on IEEE 30-bus and New England 39-bus systems, and the obtained results have been compared with previous literature in terms of solution quality. © 2013 Taylor & Francis Group, LLC.


Thakar P.V.,Charotar Institute of Technology | Mewada H.,Charotar Institute of Technology
Proceedings - International Conference on Communication Systems and Network Technologies, CSNT 2012 | Year: 2012

Now days, the satellite navigation system such as GPS is used world widely for many applications which are growing fast creating need of satellite navigation. Regional satellite navigation systems are growing now which uses similar frequency as GPS so it creates the interference to GPS signal. The use of the Binary Offset Carrier (BOC) modulated signal in incoming satellite navigation systems can reduce this interference as it has low PSD at carrier frequency. In the receiver for satellite navigation system, the first main part is the acquisition which gives the coarse value of code phase and frequency to make the transmitter and receiver code align so to get data back so it is very important part of the satellite navigation receiver. The popular algorithms of the code phase and frequency acquisition for GPS like signals are serial search or time domain acquisition algorithm, parallel code phase search or FFT based algorithm, parallel frequency space search acquisition. The same algorithms can work for the BOC modulated satellite navigation signal by making a small change in them. Also to overcome the drawback of the parallel frequency space search acquisition, as a solution the squaring acquisition algorithm is described in this paper. In this paper, these algorithms are implemented and simulated by us in MATLAB for the BOC modulated satellite navigation signal and they are compared. © 2012 IEEE.

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