Fast steady-state stability assessment for real-time and operations planning

Savulescu, S. C.; Oatts, M.L.; Pruitt, J.G.; Williamson, Frank R.; Adapa, R.

doi:10.1109/59.260960

Cited by 27 publications

(7 citation statements)

References 10 publications

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“…On this basis, an important extension of the original Dimo's method has been proposed (EPRI 1992(EPRI /1993Savulescu et al 1993) and subsequently incorporated in the fast steady-state stability software documented in (Gonzalez 2003;AvilaRosales et al 2004;Savulescu 2004;Tweedy 2004;Avila-Rosales and Giri 2005;Vergara et al 2005a;Campeanu et al 2006;Virmani et al 2007;Vickovic et al 2009;Arnold et al 2009;Eichler et al 2011;Stottok et al 2013).. It consists of simulating this behavior of the synchronous machine by changing its model from a constant emf ' d E behind the transient reactance ' d x to a constant emf E behind the synchronous reactance x d when the reactive power at the machine terminals has reached the MVAr limit.…”

Section: Modeling the Generatorsmentioning

confidence: 99%

“…Indeed, a method that meets these requirements was developed in Europe in the early 1960s by Paul Dimo (Dimo 1961(Dimo , 1975 and introduced in the USA in the 1990s (EPRI 1992(EPRI , 1993Savulescu et al 1993;Erwin et al 1994). It quickly became obvious that, if taken from the drawing board to the real life, this approach does have the potential to overcome the real-time stability challenge.…”

Section: Introductionmentioning

confidence: 97%

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Fast Computation of the Steady-State Stability Limit

Savulescu

2014

Power Electronics and Power Systems

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This chapter addresses the theoretical foundation of a field-proven real-time steady-state stability tool (The commercial name of this tool is Siemens Spectrum Power QuickStab. The software is owned by Siemens AG, Germany, and is seamlessly integrated with the Spectrum Power SCADA/EMS platform and SIGUARD ® Dynamic Security Assessment suite) that quickly and reliably quantifies and visualizes the risk of blackout due to instability. The approach is inspired from Paul Dimo's steady-state stability analysis method and uses the Bruk-Markovic reactive power stability criterion in the REI Nets framework to determine how far the power system is from a state where voltages may collapse and generators may lose synchronism. The technique derives its speed and robustness from Dimo's sound approximations and simplifying assumptions, which are analyzed and substantiated. Metrics that quantify the distance to instability and to the security margin are also discussed, along with innovative tools that extract and visualize essential information from the large amount of computational results. IntroductionModern transmission networks must sustain megawatt (MW) transfers that can be quite different from those for which they were planned. This is because energy transactions across multi-area systems may cause parallel flows, excessive network loadings, and low bus voltages. Under certain conditions, such degraded states may lead to blackouts-but how to quantify the risk of blackout? How to do it quickly in real time, using input from the most recent state estimate and displaying the results before the immediately next state estimation cycle, so that the operator could make truly online, split-second decisions? And how to extract essential information from large amounts of data and computational results and present it in formats that can be instantly understood and relied upon?

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Section: Modeling the Generatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Fast Computation of the Steady-State Stability Limit

Savulescu

2014

Power Electronics and Power Systems

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“…These functions are executed both in real-time and in study-mode. The solution technique is based on the methodology described in [4], [5], [8], [14], [15] and [21]. In a nutshell, the algorithm consist of alternating steady-state stability checks with "case worsening" calculations that stress the system from the base operating conditions towards a case where the determinant of the dynamic Jacobian becomes singular, thus indicating steady-state instability.…”

Section: B Implementation Of Real-time Stability Assessment and Monimentioning

confidence: 99%

LIPA implementation of real-time stability monitoring in a CIM compliant environment

Arnold

Hajagos

2009

2009 IEEE/PES Power Systems Conference and Exposition

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This paper addresses the practical implementation of real-time stability assessment and monitoring at Long Island Power Authority (LIPA). After a brief introduction of the power system under LIPA's jurisdiction in the context of the Eastern US interconnection, the CIM compliant functionality added to the existing SCADA/EMS facilities is presented. On this background, the implementation of real-time stability assessment by loosely integrating an off-the-shelf third-party application with the existing CIM compliant SCADA/EMS is described. The most important aspects of the implementation are addressed, including the extensive benchmarking of the real-time stability program. The operational results obtained to date are illustrated with actual pictures taken directly from the application's displays. IndexTerms --open access transmission, maximum loadability, energy management systems, independent system operators.

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“…The analysis is meant to provide useful information regarding the computations needed to be periodically performed in order to have a clear image about the security margins available in a power system for a given stage of time and how to increase these margins in order to keep a "safe distance" from a blackout [1]. For any power system or any stability constrained area it is possible to find a "safe" MW system loading, referred to as stability reserve, such that, for any system state with a steady-state stability reserve smaller than this value, any disturbance, no matter how small, would cause instability and blackout [2].…”

Section: Introductionmentioning

confidence: 99%

Improvement of power systems security margins by using FACTS devices

Ciausiu¹,

Eremia

2011

2011 IEEE Trondheim PowerTech

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This paper is treating the problem of identifying stability reserves and finding out the best solutions to improve available security margins in order to be at a safe "distance" from a blackout in the analyzed power system. The issue consists in the computation of the stability limits for a power system either with or without using FACTS devices in order to highlight the gain in power system stability and control by using these devices.The key aspects of the well known approaches related to the steady-state stability limits (SSSL) computation is reviewed and an algorithm for SSSL identification, developed by the authors in order to be fitted for power systems planning and operation is also described. A methodology to choose between different locations for a FACTS device in order to increase the security margins of the analyzed power system is going to be proposed. The paper is focusing on the aspects of preventing blackouts by finding out a methodology to establish the need of FACTS devices in a power system. The technical aspects treated here consist in assessing the stability reserves for a power system or for a specific constrained area in a power system (with and without using the FACTS devices) beyond which a blackout might appear.Index Terms-security margins, voltage stability limit, steadystate stability, time domain analysis, stability limits, FACTS devices. PV P Q QV VQ J J J J JAC Florin Emilian Ciausiu is presently Phd student at University "Politehnica" of Bucharest, Power Engineering Faculty, Electric Power Systems Department. He has activated as engineer in Tractebel Engineering GDFSUEZ (Energy Division -Power Systems Studies Department) -Bucharest since 2003. His special fields of interest include power systems dynamics, software modeling of power systems, steady-state stability assessment, transient stability assessment, voltage stability, power-frequency control and short circuit computations. Mircea Eremia (M'98, SM'02) received the B.S. and Ph.D. degree in electrical engineering from the Polytechnic Institute of Bucharest in 1968 and 1977 respectively. He is currently Professor at the Electric Power Engineering Department from University "Politehnica" of Bucharest. His area of research includes transmission and distribution of electrical energy, power system stability and FACTS applications in power systems.

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Fast steady-state stability assessment for real-time and operations planning

Cited by 27 publications

References 10 publications

Fast Computation of the Steady-State Stability Limit

Fast Computation of the Steady-State Stability Limit

LIPA implementation of real-time stability monitoring in a CIM compliant environment

Improvement of power systems security margins by using FACTS devices

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