monitoring ofgas turbine start-up sequences. The vast ... need for an automated solution. ... derived from the combination of partial solutions provided by the.
with the help of fuzzy logic, a better barrier parameter for each complementarity pair and effectively computes a second corrector term to improve the convergence of the PCIPA. The effectiveness of FSCS is demonstrated by several large-scale test cases. From the numerical results, it is found that the proposed FSCS improves PCIPA by 20% in terms of CPU times. Keywords: Optimal power flow, direct nonlinear interior point algorithm, fuzzy logic, predictor-corrector method. Preprint Order Number: PE-021PRS (05-2001) Discussion Deadline: October 2001
derived from the combination of partial solutions provided by the components of the multiagent system. As a consequence, data interpretation is achieved by converting the data into appropriate information and combining individual agents' information, resulting in an automatic fault diagnosis for the engineers. This multiagent system can employ various intelligent system techniques and has been implemented using the ZEUS agent building toolkit. Keywords: Condition monitoring, intelligent agents. Preprint Order Number: PE-033PRS (05-2001) Discussion Deadline: October 2001
Modeling of the Generalized Unified Power Flow Controller (GUPFC) in a Nonlinear Interior Point OPF
Exploring the Power Flow Solution Space Boundary Hiskens, I.A.; Davy, Rj.
Zhang, X-P.; Handschin, E.; Yao, M. Author Affiliation: University of Warwick, Coventry, U.K.; Universitat Dortmund, Dortmund, Germany; Alstom ESCA Corporation, Bellevue, WA Abstract: With the progress of installing the latest generation of FACTS devices, namely, the convertible static compensator (CSC) [l], several innovative operating concepts have been introduced to the historic development and application of FACTS. One of the novel concepts is the generalized unified power flow controller (GUPFC), or multiline UPFC, which can control bus voltage and power flows of more than one line or even a subnetwork. The GUPFC should have stronger control capability than the UPFC. A mathematical model for the GUPFC consisting of one shunt converter and two or more series converters is developed and implemented in a nonlinear interior point OPF algorithm. Numerical results with various GUPFC devices based on the IEEE 30 bus system and IEEE 118 bus system demonstrate the feasibility as well as the effectiveness of the GUPFC model established and the OPF method proposed. Keywords: ac transmission, FACTS, power flow controller, STATCON, SSSC, UPFC, IPFC, GUPFC, power flow, optimal power flow. Preprint Order Number: PE-014PRS (05-2001) Discussion Deadline: October 2001
Market Power Assessment and Mitigation in Hydrothermal Systems Kelman, R.; Barroso, L.A.N.; Pereira, M.V. Author Affiliation: Power Systems Research Inc., Rio de Janeiro, Brazil Abstract: The objective of this paper is to investigate market power issues in bid-based hydrothermal scheduling. Initially, market power is simulated with a single-stage Nash-Coumot equilibrium model. Market power assessment for multiple stages is then carried through a stochastic dynamic programming scheme. The decision in each stage and state is the equilibrium of a multi-agent game. Thereafter, mitigation measures, specially bilateral contracts, are investigated. Case studies with data taken from the Brazilian system are presented and discussed. Keywords: Game theory, hydroelectric-thermal power generation, power generation economics. Preprint Order Number: PE-018PRS (05-2001) Discussion Deadline: October 2001 A Multiagent System for Monitoring Industrial Gas Turbine Startup Sequences Mangina, E.E.; McArthur, S.Dj.; McDonald, J.R.; Moyes, A. Author Affiliation: University of Strathclyde, Scotland, U.K. Abstract: This paper introduces a novel technique for condition monitoring of gas turbine start-up sequences. The vast amount of data and the complex processes behind on-line fault detection indicate the need for an automated solution. A multi-agent system that views the problem as the interaction of simple independent software entities for effective use of the available data is presented. The overall solution is IEEE Power Engineering Review, August 2001
Author Affiliation: University of Illinois at Urbana-Champaign, Urbana, IL; CSIRO Land and Water, Canberra, Australia Abstract: A knowledge of the structure of the boundary of solutions of the power flow problem is important when analyzing the robustness of operating points. This paper proposes a predictor-corrector technique to assist in exploring that structure. Points on the solution boundary satisfy the power flow equations together with an equation that forces the power flow Jacobian to be singular. Curves of such points result from freeing two parameters of the system. The proposed technique follows those curves. A simple example is used to illustrate the complex nature of the power flow solution space. Keywords: Power flow, continuation methods, Jacobian singularity, solution space boundary, maximum loadability. Preprint Order Number: PE-028PRS (05-2001) Discussion Deadline: October 2001
Existence and Determination of Competitive Equilibrium in Unit Commitment Power Pool Auctions: Price Setting and Scheduling Alternatives Madrigal, M.; Quintana, V.H. Author Affiliation: University of Waterloo, Canada Abstract: The existence, determination, and effects of competitive market equilibrium for unit commitment power pool auctions are investigated in this paper. When an equilibrium does not exist, under specific situations conflictive multiple optimal primal solutions may exist. When an equilibrium exists, multiple primal solutions do not represent conflicts of interest. The existence or nonexistence of competitive equilibrium can be determined if the dual problem is solved to optimality. If equilibrium does not exist, there is excess supply at the optimal dual solution, which can be used to define priority orders and price-setting altematives to determine a final schedule, and avoid the conflicts of interest and revenue deficiency. Under disequilibrium, the optimal dual variables are not market clearing prices; a nonuniform pricing rule that avoids the flaws and complications of other pricing rules, such as maximum average cost and price minimization auctions, is proposed in the paper. The proposed scheduling and price-setting altematives show that unit commitment models can be used in a market environment. Preprint Order Number: PE-027PRS (05-2001) Discussion Deadline: October 2001
Numerical Experiments with an Optimal Power Flow Algorithm Based on Parametric Techniques Lima, F.G.M.; Soares, S.; Santos Jr., A.; Almeida, K.C.; Galiana, F.D. Author Affiliation: University Federale do Mato Grosso do Sul, Campo Grande, MS, Brazil; University Estadual de Campinas, Campinas, Sao Paolo, Brazil; University Federale de Santa Catarina, SC, Brazil; McGill University, Quebec, Canada Abstract: This paper presents the results of numerical experiments
with a new optimal power flow (OPF) algorithm based on a parametric
technique. The approach consists of relaxing the original OPF problem by incorporating parametric terms to the objective function, the equality, and inequality constraints. Such relaxation assures that any arbi57
