Real-time contingency analysis methods to mitigate congestion in the ercot region

Thompson, Chad; McIntyre, Kenneth E.; Nuthalapati, Sarma; Garcia, Agnaldo; Villanueva, Elias A.

doi:10.1109/pes.2009.5275246

Cited by 16 publications

(9 citation statements)

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“…The report recommended that utilities should have a security assessment tool in the control centre that is capable of periodically assessing the system security for selected key contingencies [50]. This tool is commonly known as Real-Time Contingency Analysis (RTCA) and is now part of the EMS used in most utilities [51][52][53][54].…”

Section: Situational Awareness and Security Assessments In Power Systmentioning

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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Section: Situational Awareness and Security Assessments In Power Systmentioning

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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“…It shall be mentioned that operators can activate or deactivate any constraints for use in SCED, at his discretion. Also, besides use of SCED for violation mitigation, operators may issue manual instructions to market participates for violation management, taking recommendations from operations support team [12].…”

Section: Constraint Violationsmentioning

confidence: 99%

Security assessment and enhancement in real-time operations of ERCOT nodal electricity market

Luo¹,

Obadina²

2010

IEEE PES General Meeting

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Ensuring system reliability and security while operating electricity markets is the primary responsibility of independent system operators. Maintaining system security in real-time is a significant challenge due to limited time frame permitted for analyzing and responding to security issues. This paper focuses on the applications designed to address static security in the real-time operations of ERCOT nodal electricity market. It first gives the theoretical fundamentals of the definition of power system static security, security assessment based on contingency analysis and security enhancement based on security constrained optimal power flow method. Following the theoretical background discussion, applications for static security assessment and enhancement are introduced. The business process to handle security violations of transmission constraints using those applications is further explained.

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“…Transmission switching, as an emerging operational scheme, has gained considerable attention in both industry and academia in the recent years [38,12,16,26,17]. Switching on and off transmission lines, therefore, changing the network topology in the real-time operation, may bring several benefits that the traditional economic dispatch cannot offer, such as reducing the total operational cost [12,15,14], mitigating transmission congestion [43], clearing contingencies [25,30], and improving do-not-exceed limits [31] .…”

Section: Introductionmentioning

confidence: 99%

New Formulation and Strong MISOCP Relaxations for AC Optimal Transmission Switching Problem

Kocuk

Dey

Sun

2017

IEEE Trans. Power Syst.

121

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As the modern transmission control and relay technologies evolve, transmission line switching has become an important option in power system operators' toolkits to reduce operational cost and improve system reliability. Most recent research has relied on the DC approximation of the power flow model in the optimal transmission switching problem. However, it is known that DC approximation may lead to inaccurate flow solutions and also overlook stability issues. In this paper, we focus on the optimal transmission switching problem with the full AC power flow model, abbreviated as AC OTS. We propose a new exact formulation for AC OTS and its mixed-integer second-order conic programming (MISOCP) relaxation. We improve this relaxation via several types of strong valid inequalities inspired by the recent development for the closely related AC Optimal Power Flow (AC OPF) problem [27]. We also propose a practical algorithm to obtain high quality feasible solutions for the AC OTS problem.Extensive computational experiments show that the proposed formulation and algorithms efficiently solve IEEE standard and congested instances and lead to significant cost benefits with provably tight bounds.

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Real-time contingency analysis methods to mitigate congestion in the ercot region

Cited by 16 publications

References 0 publications

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

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

Security assessment and enhancement in real-time operations of ERCOT nodal electricity market

New Formulation and Strong MISOCP Relaxations for AC Optimal Transmission Switching Problem

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