Techniques for the Real-Time Monitoring of Power System Operations

Stagg, G. W.; Dopazo, J.F.; Klitin, O.A.; VanSlyck, L.S.

doi:10.1109/tpas.1970.292601

Cited by 58 publications

(6 citation statements)

References 7 publications

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“…Table 5 lists the values for the first five combinations, and the 10th, 20th, 30th, and 36th combination selected in ascending order after finding the sum of the phase angle adjustment coefficient for each combination. Based on this table, the smallest value is found in the combination for line (7,10,17,31). This is the same as the selection using the proposed selection procedure, and it shows that the selection method is valid.…”

Section: Confirming the Selection Methods For The Lines Where The Phasmentioning

confidence: 99%

A new approach for completing the phase shifter angle for load flow control in the network with multiple loops

Sato

Hasegawa

2004

Electrical Engineering Japan

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SUMMARYA phase shifter has been used to control line flow. In the network with multiple loops, it is necessary to modify the angle of the phase shifter to reduce the flow on a certain line if it exceeds the limit. A new method to compute the value of the angle that is set to the phase shifter is proposed. The coefficient is computed by using two relations. No one is between the change of the lined flow on a certain line and modification of power injection and two notes. The other is between the change of the flow on a line in the change of the angle of a phase shifter. Then the phase angle is computed by multiplying the coefficient and the amount of flow on the line. The coefficients can be used for finding the locations where phase shifters will be placed in order to correct any overload that may occur at any line in the loops and can be used for computation of available transmission capacity. The validity of this method was shown by numerical examples using an IEEE 30 bus system.

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Section: Confirming the Selection Methods For The Lines Where The Phasmentioning

confidence: 99%

A new approach for completing the phase shifter angle for load flow control in the network with multiple loops

Sato

Hasegawa

2004

Electrical Engineering Japan

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“…More importantly, these advanced computers made it possible to realistically consider the application of control computers for the reliability aspect of system operation. An important consideration in the use of on-line computers for reliability applications was the development and testing of analytical techniques for monitoring the present status of the power system by developing a real-time power flow solution based on system measurements [62,[93][94][95]. The real-time power flow model derivation process used a state estimator to address any errors associated with measurements and missing data.…”

Section: Evolution Of Equivalent Circuits Over Timementioning

confidence: 99%

Development of an Equivalent Circuit of a Large Power System for Real-Time Security Assessment

Wijeweera

Annakkage

Zhang

et al. 2018

IEEE Trans. Power Syst.

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More and more system operators are interested in calculating transfer capability in realtime using real-time power flow models generated from the Energy Management System (EMS). However, compared to off-line study models, EMS models usually cover only a limited portion of the interconnected system. In most situations, it is not practical to extend the EMS model to capture the impact of the external systems and therefore using an equivalent network becomes necessary.The development of equivalent circuits to represent external areas was a topic discussed over the last 50 years. Almost all of these methods require impedance information about the external area to develop the equivalent circuit. Unfortunately utilities do not have the external impedance information in the real-time. Therefore, normal industry practice is to use off-line studies to develop an equivalent circuit and use that circuit in the real-time operation without any validation. This can result in errors in the security assessment. Therefore, power industry need a method to develop or validate an equivalent circuit based on the available real-time information. This thesis work is focussed on meeting that industry need.The work on this thesis presents two new methods that can be used to generate an equivalent circuit based on the boundary conditions. This method involves calculating equivalent impedance between two areas based on the boundary stations voltages, voltage angles and power leaving the boundary stations into external areas.This thesis uses power system simulation between two areas to change the system condition to obtain different boundary bus voltages, voltage angles and power injections to generate necessary data. Regression analysis and least square method is then used to generate the equivalent circuit using these data. It is expected that system changes will provide necessary information in the real-time to generate the equivalent circuit.The proposed methodology is validated with modified three area 300 bus system as well as using Manitoba Hydro's system. Contingency analysis, transfer level calculation and PV curves analysis is used to validate the proposed method. Simulation results show that the proposed method produces adequate accuracy in comparison with detailed off-line system models.The main advantage of the proposed method as compared to other existing methods such as Ward and REI is that the proposed method does not require external impedance information to generate the equivalent circuit. The ability to generate reasonably good equivalent circuit only using available boundary information will help utilities to generate or validate the equivalent circuit based on the current system conditions, which will intern help improve the accuracy of the security assessment.i Acknowledgments I would like to express my appreciation and sincere thanks to Udaya Annakkage, my research advisor, for his guidance, support and advice throughout this research. I was truly enriched by the many discussions we had over the course of thi...

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“…The initial AEP installation aimed at the economic operation of generation and transmission facilities [12], but its focus was soon extended to the real-time monitoring of the current status of the power system [13].…”

Section: A the Early Days Of Online Computing In System Operationsmentioning

confidence: 99%

Half a century of computer methods in power system analysis, planning and operations: Part II: Glenn W. Stagg and his contributions to advancing the technology

Savulescu

Virmani

2011

2011 IEEE/PES Power Systems Conference and Exposition

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This paper is the second paper devoted to the contributions of Glenn W. Stagg to the advancement of the stateof-the-art in power system analysis, planning and operations. It provides a critical review and assessment of his work in the fields of: computer method development; faults and short circuit analysis; load-flow and stability computation techniques; and energy management systems. Also emphasized are the far reaching consequences of Glenn W. Stagg's seminal work, which eventually opened the road for some of the advanced applications of today that were not even conceivable during those pioneering years. It is hoped that this succinct overview of his work will serve as motivation and inspirational example for students, researchers and power system professionals.

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Techniques for the Real-Time Monitoring of Power System Operations

Cited by 58 publications

References 7 publications

A new approach for completing the phase shifter angle for load flow control in the network with multiple loops

A new approach for completing the phase shifter angle for load flow control in the network with multiple loops

Development of an Equivalent Circuit of a Large Power System for Real-Time Security Assessment

Half a century of computer methods in power system analysis, planning and operations: Part II: Glenn W. Stagg and his contributions to advancing the technology

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