Fast Decoupled Load Flow

Stott, B.; Alsaç, O.

doi:10.1109/tpas.1974.293985

Cited by 1,301 publications

(419 citation statements)

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“…One route for improving estimations of apparent power is to integrate reactive flows into the linearized DC model as in the fast decoupled load flow [24]. Another option is to approximate the nonlinear behavior of reactive flows with a mixed integer programming (MIP) formulation [4].…”

Section: Approximating Apparent Powermentioning

confidence: 99%

Approximating line losses and apparent power in AC power flow linearizations

Coffrin

Hentenryck

Bent

2012

2012 IEEE Power and Energy Society General Meeting

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Abstract-The linearized DC model is widely used in optimization of power systems but few studies evaluate the accuracy and feasibility of its solutions. This paper studies the source of errors in the linearized DC model and proposes three new models to improve its accuracy. In particular, it proposes a cold-start model capturing line losses and hot-starts models for approximating apparent power and more accurate phase angles. All of the models are linear programs and can easily be used as a building block for more complex applications. Experimental results on well-known benchmarks show the significant benefits in accuracy of the new models and the high correlation of their solutions with AC solutions.Index Terms-power flow, dc power flow, power system analysis, line losses, apparent power.

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Section: Approximating Apparent Powermentioning

confidence: 99%

Approximating line losses and apparent power in AC power flow linearizations

Coffrin

Hentenryck

Bent

2012

2012 IEEE Power and Energy Society General Meeting

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“…Thus, equations that relate real powers and phase angles will are considered only. More specifically, the real power balance equation of the fast decoupled load flow formulation (Stott and Alsaç, 1974) is used. Cases for which power flows are affected by voltages magnitudes are appropriately taken care of in the solution process, as it will become clear in Sec.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Since only the real power part of the load flow equations are used, matrix [∂g/∂θ] T is replaced by the fast decoupled load flow matrix (−B ) (Stott and Alsaç, 1974). B is a symmetrical matrix with constant entries, and it is factorized only once.…”

Section: Appendix a Optimality Condi-tionsmentioning

confidence: 99%

A New Efficient Nonlinear Programming-Based Method for Branch Overload Elimination

Abrantes¹,

Castro²

2002

Electric Power Components and Systems

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A simple and efficient method for eliminating branch overloads in power systems is presented in this paper. The overloads are eliminated by corrective control actions, which are defined through the use of an efficient and accurate nonlinear programming method. Generation rescheduling (GR) and load shedding (LS) are the main controls used. The idea of adaptative local optimization (ALO) is introduced. The computation of appropriate GR using ALO becomes a very efficient process. LS is used as a last resort, when further GR is no longer possible. Heuristics are added in order to speed up the computation process and to take into account some practical aspects of power systems operation into it. A special procedure is carried out in case of critical situations, where emergency control actions are defined. The method's general idea is to keep the new secure operating point as close as possible to the original one, while minimizing the amount of LS. The method can be a helpful tool for operation planning studies, security analysis and reliability evaluation of power systems. Simulations have been carried out for small test to large real life systems in order to show the efectiveness of the proposed method.KEYWORDS: Power system security analysis, power system operation, violations elimination, nonlinear programming.Artigo submetido em 30/11/00 1a. Revisão em 22/11/01; 2a. revisão em 25/04/02 Aceito sob recomendação do Ed. Assoc. Prof. José Luiz R. Pereira RESUMONeste artigoé proposto um método simples e eficiente para eliminar sobrecargas em ramos de redes elétricas de potência. Essas sobrecargas são eliminadas através de ações de controle corretivo que são definidas através do uso de um método preciso e eficiente de programação não-linear. Redespacho da geração e corte de carga são os principais controle utilizados. A idéia de otimização local adaptativaé introduzida. O cálculo dos redespachos de geração utilizando a otimização local adaptativaé realizado de maneira muito eficiente. O corte de cargaé utilizado comoúltima alternativa, nas situações em que o redespacho da geração nãoé mais possível. Heurísticas são acrescentadas a fim de tornar o procedimento computacional mais rápido e de levar em conta alguns aspectos práticos da operação de redes elétricas de potência. Um procedimento especialé executado no caso de situações críticas, em que ações de controle de emergência são realizadas. A idéia geral do métodoé fazer com que o novo ponto de operação segura esteja o mais próximo possível de ponto de operação original, além de minimizar o montante de corte de carga. O método proposto pode ser uma ferramentaútil para estudos de planejamento, análise de segurança e avaliação da confiabilidade de sistemas de potência. Foram realizadas simulações para várias redes, incluíndo redes teste de pequeno porte e redes de grande porte reais, a fim de mostrar a eficácia do método proposto.

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“…This has a cascading effect, and in successive iterations of FDLF, voltages at certain nodes may drop dramatically below the rated value. FDLF loses its robustness when voltage deviations are significant [21].…”

Section: Introduction S Hort-term Transmission Expansion Planning mentioning

confidence: 99%

An Expert System Approach for Multi-Year Short-Term Transmission System Expansion Planning: An Indian Experience

Gajbhiye

Naik

Dambhare

et al. 2008

IEEE Trans. Power Syst.

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Abstract-This paper proposes an expert system approach to short-term expansion planning (STEP). The rules which drive STEP can be classified into MW, MVAR, and ampacity management rules. MW and ampacity management rules are for alleviating transmission line congestion. Reactive power management is required for voltage control at load busses, conformity to the capacity curve of the generators, and containing the MW losses within acceptable limits. Embedding reactive power management in STEP is a challenging task since ac load flow may not converge in absence of proper reactive power planning and load modeling. Therefore, we also propose enhancements to the fast decoupled load flow algorithm for on-the-fly reactive power management. The enhanced algorithm not only can detect divergent load flow scenarios but also self-correct it by restarting the whole process with greater degree of freedom in reactive power controls. The proposed approach leads to development of an automated tool for STEP which has the capability to work, even with incomplete information. A simple method for evaluating location and requirement of shunt reactor is also proposed. By analysis and comparative evaluation, we show that the proposed system can arrive at a solution which is close to optimal. Results on the Western Regional Grid of India with an approximate load of 28 000 MW and 1200 nodes are presented to demonstrate effectiveness of the proposed approach.Index Terms-Congestion, contingency, fast decoupled load flow (FDLF), reactive power compensation (RPC), short-term transmission expansion planning (STEP).

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Fast Decoupled Load Flow

Cited by 1,301 publications

References 10 publications

Approximating line losses and apparent power in AC power flow linearizations

Approximating line losses and apparent power in AC power flow linearizations

A New Efficient Nonlinear Programming-Based Method for Branch Overload Elimination

An Expert System Approach for Multi-Year Short-Term Transmission System Expansion Planning: An Indian Experience

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