Oligopolistic Competition in Power Networks:A Conjectured Supply Function Approach
Day, Cj.; Hobbs, B.F.; Pang, J.S.
Abstract: Conjectured supply function (CSF) models of competi-tion among power generators on a linearized DC network are pre-sented. As a detailed survey of the power market modeling literatureshows, CSF models differ from previous approaches in that they repre-sent each generation company's (GenCo) conjectures regarding how ri-val firms will adjust sales in response to price changes. The CSFapproach is a more realistic and flexible framework for modeling im-perfect competition than other models for three reasons. First, the mod-els include as a special case the Cournot conjecture that rivals will notchange production if prices change; thus, the CSF framework is moregeneral. Second, Coumot models cannot be used when price elasticityof demand is zero, but the proposed models can. Third, unlike supplyfunction equilibrium models, CSF equilibria can be calculated for largetransmission networks. Existence and uniqueness properties for pricesand profits are reported. An application shows how transmission limitsand strategic interactions affect equilibrium prices under forced divest-ment of generation.
Keywords: Electricity competition, electricity generation, marketmodels, strategic pricing, complementarity, supply function models,England, United Kingdom.
Preprint Order Number: PE-361PRS (02-2002)Discussion Deadline: July 2002
A High Resolution Spectral Analysis Algorithmfor Power System Disturbance MonitoringO'Shea, P
Author Affiliation: QUT.Abstract: In [1] a Fourier based algorithm was presented for moni-
toring the characteristics of the damped oscillating "modes" that are setup after a disturbance in an electric power distribution system. This ear-lier paper allowed for the analysis of multiple modes, but only if themodes were sufficiently well separated to be resolved with conven-tional Fourier techniques. This current paper extends the work in [ I] toenable the processing of multiple modes which are very closely spacedin frequency. Importantly, the proposed algorithm has good noise per-formance. A theoretical justification for the new method is presented,and simulations are provided to confirm the theory. The scheme is alsotested on a real power system example.
Keywords: Fourier, signal analysis, modal analysis, stability.Preprint Order Number: PE-626PRS (02-2002)Discussion Deadline: July 2002
Power System Communications
ESTELLE: A Method To AutomaticallyAnalyze the Performance of TelecontrolProtocols in SCADA Systems
Medina, V; Gomez, I.; Luque, J.Martin, S.
Abstract: This article presents the use ofESTELLE, a formal descrip-tion technique, as a method to calculate automatically the performance oftelecontrol protocols in SCADA systems. Some specific primitives areadded to the ESTELLE description language in order to achieve that goal.As an example, we analyze the performance of a telecontrol protocol. Theresults from this method are compared to performance measurements ob-tained from analytical and simulated solutions.
Keywords: Performance analysis, performance modelling, proto-col specification, SCADA systems, telecontrol protocols, throughput,transmission delay.
Preprint Order Number: PE-058PRD (02-2002)Discussion Deadline: July 2002
Power System Operation
Implementation of an ACE1 Decomposition Method
Hoonchareon, N.B.; Ong, C.M.; Kramer, R.A.
Author Affiliation: Purdue University; Northern Indiana PublicService Company.
Abstract: Having established the feasibility and developed amethod to decompose a control area's ACEI into components attribut-able to load changes in subareas within the control area, this paper ad-dresses some of the practical issues with an online implementation ofthe ACEI model and the decomposition method. Issues examined hereinclude time-varying system condition, nonlinearities in the governors'deadbands and AGC loop, and the impact of load disturbance externalto the control area. An online recursive parameter estimation techniquewith adjustable forgetting factor to update the ACEi model parametersis proposed.
Keywords: ACE, regulation, ancillary services.Preprint Order Number: PE-281PRS (02-2002)Discussion Deadline: July 2002
Feasibility of Decomposing ACE To Identify theImpact of Selected Loads on CPS1 and CPS2
Hoonchareon, N.B.; Ong, C.M.; Kramer, R.A.
Author Affiliation: Purdue University; Northern Indiana PublicService Company.
Abstract: Control areas are held to the NERC's control perfor-mance standards, CPS1 and CPS2. A control area serving rapid andwidely varying loads would like to know how load variations in certainsubareas or zones affect its area's CPS 1 and CPS2 measures. This paperaddresses the question of decomposability of the 1-minute averagevalue of ACE, ACE1, the primary variable in the computation of CPS1and CPS2, into components attributable to load fluctuations within de-fined zones. It includes descriptions of dynamic models of ACE andACEI, and simulated results confirming the decomposability ofACEI.
Keywords: Regulation, ancillary services, decomposition, modelfoe-minute average of ACE.
Preprint Order Number: PE-214PRS (02-2002)Discussion Deadline: July 2002
Knowldege-Based System for Distribution SystemOutage Locating Using Comprehensive Information
Liu, Y; Schulz, N.N.
Author Affiliation: GE Corporate Research and Development;Mississippi State University.
Abstract: This paper presents a knowledge-based system (KBS)designed to locate distribution system outages using comprehensivedata from customer trouble calls, a wireless automated meter reading(AMR) system, and distribution supervisory control and data acquisi-tion (SCADA). The algorithm uses the on-demand read capability of awireless AMR system, which allows the utility to communicate di-rectly with the meter controllers. The algorithm of the developed KBShas two major parts: an outage escalation procedure and meter-pollingprocedure. The escalation procedure involves searching for the outageregion according to the comprehensive outage information. The me-ter-polling procedure includes designing the meter-polling schema andconfirming the outage locations based on the meter polling results. Thealgorithm was designed to handle both single outage and multiple out-age situations. The expert system shell, G2, was used as the develop-ment tool.
Keywords: Automated meter reading (AMR), outage locating,knowledge-based system (KBS), distribution systems, G2.
Preprint Order Number: PE-338PRS (02-2002)Discussion Deadline: July 2002
IEEE Power Engineering Review, May 200268
