Electric Power Engineering

Elgerd, Olle I.; Puije, Patrick D. van der

doi:10.1007/978-1-4615-5997-9

Cited by 14 publications

(3 citation statements)

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“…Figure1includedArea1andArea2thermalsystem,whileArea3isthehydrosystem.Thermal areaconsistsofareheatturbineandHydroAreaconsistsofmechanicalgovernor.Thesethreeareas areconnectedthroughthetie-line.Whenthesystemisoperatedinstablecondition,thereisnopower exchangebetweentheareasthroughthetie-line.Ifthereisanyloaddisturbance,thepowerflowoccurs inthesystemtie-line (Thottungal&Anbalagan,2003;Nagrath&Kothari,1994).Thisloaddemand willbesatisfiedthroughthetie-lineduetothepowerexchangebetweentheareas.Normally,there existsalimit(minimumandmaximum)ontherateofchangeinthepowergeneration.Thesystem dynamicresponsehaslargeovershootandlongersettlingtimewhenGRCistakenintotheaccount compared to the system performance without considering GRC (Nandha et al, 2006;Kothari et al,1983). Elgerd(1970)foundthatthelimitationofGRCforthermalandhydropowersystemwas theGRClimitinthethermalpowersystemgivenby0.0017p.uSec -1 .Thevalueofgenerationrate constraintforhydrosystemwashigherthanthethermalsystem (Elgerd,1970).Inthiswork,4.5% sec-1wasconsideredforrisingthegenerationand6%sec-1forloweringthegeneration.…”

Section: Three Area Interconnected Hydro -Thermal Power Systemsmentioning

confidence: 72%

AGC of Multi-Area Hydro-Thermal Power Systems With GRC Non-Linearity and Classical Controller

Jagatheesan¹,

Anand

2018

Journal of Global Information Management

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In this article, the optimal gain value of classical controller gain values is obtained by using different performance indices in Automatic Generation Control. These are interconnected by the three areas of a hydro-thermal power system. The thermal and hydro areas are incorporated with a reheat turbine and a mechanical governor, respectively. The current article was created to select a suitable technique for the tuning of controller gain, when 1% of a step load is given to the thermal area (Area 1). The performance of several controllers, such as Integral (I), Proportional-Integral (PI), and Integral-Derivative (ID) were evaluated and were compared to the cases of with and without Generation Rate Constraint (GRC) non-linearity. The classical controller gain value optimization was performed using the Integral Time Square Error (ITSE), Integral Square Error (ISE) and Integral Time Absolute Error (ITAE) performance indices. The minimum optimal value of controller gain normally offers better dynamic response. The obtained results established that the optimization based on the ITAE-PI controller always guarantees superior dynamic performances compared to other indices and controllers.

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Section: Three Area Interconnected Hydro -Thermal Power Systemsmentioning

confidence: 72%

AGC of Multi-Area Hydro-Thermal Power Systems With GRC Non-Linearity and Classical Controller

Jagatheesan¹,

Anand

2018

Journal of Global Information Management

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“…This means that, after occurrence of islanding [22,24] the admittance matrix representing the system considered will be different. So, we must construct the new admittance matrix and then monitor the parameters using the following equations [18,20].…”

Section: Islanding Operationmentioning

confidence: 99%

Islanding detection of distributed generation systems using hybrid technique for multi-machine system

Sirige

Choudhury

Jayalakshmi

2020

IJPEDS

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Due to depletion of conventional fuels and increase in power demand, many renewable energy sources are being integrated into the electrical grid. One of the major concerns with this integration of these renewable sources with utility grid is unintentional islanding. Many techniques have been proposed to detect unintentional islanding, all of them trying to comply with the IEEE standard 1547. This paper presents an analysis of the hybrid technique to detect the islanding condition of the power system with multi-machine systems. This work aims at analysing the technique against increasing size of the system with increasing number of distributed generators by including practical voltage unbalance formula. The validity of this detection technique is verified using IEEE standard test power systems in MATLAB platform. This method can be used to identify multiple islanding conditions effectively. The simulation results show the effectiveness of the technique to detect islanding condition for multi-machine systems.

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“…Specifically, the book by Hanselman [93] in addition to a few other sources [94][95][96][97][98][99][100][101][102][103], describe the critical concepts for this development. For now, it suffices to say that there is extensive motor/generator discussion in the flywheel literature dating to the 1960s and 1970s as well as extensive knowledge in the electrical engineering community dating back to the 1800s and early 1900s [93,104].…”

Section: Motor/generator Design For High Speed Flywheelsmentioning

confidence: 99%

Combines Attitude Control and Energy Storage for Small Satellites using Variable Speed Control Moment Gyroscopes

Lappas¹

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD Unit 4515 BOX 14 APO AE 09421 SPONSOR/MONITOR'S REPORT NUMBER(S)Grant 05-3037 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report results from a contract tasking University of Surrey as follows: The Grantee will investigate three areas concerning energy storage and attitude control systems (ESACS) for small satellites: a.) Use of small satellite reference models to determine the relative scales for a combined variable speed control moment gyroscope (VSCMG) energy storage (ES) system. b.) Explore potential imbalances, derive mathematical descriptions of ESACS-imbalance systems and model the ESACS system in MATLAB/Simulink.. c.) Construct experimental hardware for power conversion demonstration: An experimental VSCMG system will be used to demonstrate combined attitude control and energy storage. The imbalances modeled in (b.) will be replicated in the experimental hardware. Derived control solutions to the imbalance problem will be implemented and validated in the experimental hardware. SUBJECT TERMS Government DisclaimerThe views expressed in this article are those of the authors and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the U.S. Government. AcknowledgementsThe ii Summary This work presents the first known energy storage and attitude control subsystem (ESACS) for small satellites, proving this technology to be viable, applicable to more complex, demanding space missions, and laden with substantial benefits, such as agile slewing, robust singularity avoidance, increased lifetime, mass savings, and favourable peak power density. In capturing the key features of this novel system, it investigates the design sizing, feasibility, mission utility, experimentation, and performance benefits for using variable-speed control moment gyroscopes (VSCMGs) to store and drain energy while controlling satellite orientation.First, a novel optimal ESACS sizing algorithm is developed for a practical, miniature spotlight synthetic aperture RADAR (SAR) space mission. When given a set of small satellite agility and energy storage requirements, the design is cast as a constrained nonlinear programming problem using a performance index constructed from subsystem design margins including the attitude torque, peak power, energy capacity, and subsystem mass margins and solved using a reduced-o...

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Electric Power Engineering

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Cited by 14 publications

References 0 publications

AGC of Multi-Area Hydro-Thermal Power Systems With GRC Non-Linearity and Classical Controller

AGC of Multi-Area Hydro-Thermal Power Systems With GRC Non-Linearity and Classical Controller

Islanding detection of distributed generation systems using hybrid technique for multi-machine system

Combines Attitude Control and Energy Storage for Small Satellites using Variable Speed Control Moment Gyroscopes

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