Transmission management in the deregulated environment

Christie, R.D.; Wollenberg, B.F.; Wangensteen, I.

doi:10.1109/5.823997

Cited by 676 publications

(389 citation statements)

References 23 publications

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“…Antes deste período a estrutura organizacional do setor era vertical e monopolizada, ou seja, a geração, a transmissão e a distribuição de energia, eram controladas por uma "autoridade" conforme Christie et al (2000). Com a desverticalização do setor e o surgimento do ambiente competitivo, as ferramentas de otimização passaram a desempenhar um importante papel para as empresas de energia.…”

Section: Introductionunclassified

A resolução do problema de despacho ótimo de reativos pelo método da função lagrangiana-barreira relaxada

2008

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ResumoEste artigo apresenta a aplicação do método da função Lagrangiana-barreira relaxada ao problema de despacho ótimo de reativos, o qual é um problema não-linear não convexo e de grande porte. Nesta abordagem as restrições de desigualdade são tratadas pela associação dos métodos de barreira modificada e primal-dual barreira logarítmica. Essas restrições são transformadas em igualdades através de variáveis auxiliares positivas e são relaxadas pelo parâmetro de barreira. Uma função Lagrangiana é associada ao problema modificado. As condições necessárias de primeira-ordem são aplicadas gerando um sistema não-linear o qual é resolvido pelo método de Newton. A relaxação das variáveis auxiliares resulta na expansão da região factível do problema original, permitindo atingir o limite das restrições de desigualdade. Testes numéricos nos sistemas CESP 53 barras, o equivalente brasileiro sul-sudeste e o teste comparativo com o método primal-dual barreira logarítmica indicam que o método apresentado é eficiente na resolução do problema de despacho ótimo de reativos.Palavras-chave: programação não-linear; sistemas elétricos de potência; método primal-dual; método de Newton; relaxação das restrições. AbstractThis work presents the application of the relaxed barrier-Lagrangian function method to the optimal reactive dispatch problem, which is a nonlinear nonconvex and large problem. In this approach the inequality constraints are treated by the association of modified barrier and primal-dual logarithmic barrier method. Those constraints are transformed in equalities through positive auxiliary variables and are perturbed by the barrier parameter. A Lagrangian function is associated to the modified problem. The first-order necessary conditions are applied generating a non-linear system which is solved by Newton's method. The auxiliary variables perturbation result in an expansion of the feasible set of the original problem, allowing the limits of the inequality constraints to be reach. Numeric tests with the systems CESP 53 buses and the south-southeast Brazilian and the comparative test with the primal-dual logarithmic barrier method indicate that presented method is efficient in the resolution of optimal reactive dispatch problem.

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Section: Introductionunclassified

A resolução do problema de despacho ótimo de reativos pelo método da função lagrangiana-barreira relaxada

2008

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“…The available transfer capability indicates the amounts which inter area bulk power transfers can be increased without compromising system security [1]. The value used for available transfer capability affects both system security and the profits made in mass power transactions.…”

Section: Available Transfer Capability [Atc]mentioning

confidence: 99%

“…It is defined as that amount of transmission transfer capability taken by load serving entities to ensure access to generation from interconnected systems to meet generation reliability requirements [1,2].…”

Section: Capacity Benefit Margin (Cbm)mentioning

confidence: 99%

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Transmission Line Loadability Improvement Using Facts Device

Bhesdadiya¹

2014

IJRET

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“…In old power structure, the system operator (SO) only needs to re-dispatch the generation schedule until the congestion has been released. However, with the deregulation process, congestion management becomes more complex since transmission network has to be opened to all market participants [4]. This paper introduces four typical worldwide electricity markets and their respectively transmission congestion management schemes.…”

Section: Introductionmentioning

confidence: 99%

Variously worldwide types of deregulated electricity markets and their respective transmission congestion management schemes

Zhao

2016

2016 51st International Universities Power Engineering Conference (UPEC)

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In this paper, four practical and successful deregulated electricity markets: the old England & Wales Pool, the British Electricity Trading and Transmission Arrangements (BETTA), Nordic Pool and PJM interconnection will be briefly explained and discussed on their histories, structures, rules and also advantages and disadvantages. The old England & Wales Pool was a typical Pool type market which was one of the first successful electricity market deregulations but now had been replaced by the BETTA which is based on the bilateral and balancing mechanism. Nordic Pool and PJM are hybrid markets which combine both pool and bilateral principles. With maturing deregulated mechanism, transmission congestion becomes an urgent problem for all markets. Uniform marginal price, locational marginal price and zonal price are three typical methods in Pool and Hybrid market for congestion management. Locational marginal price is regarded as more efficient than other two when it comes to the market power dilution. In bilateral market, four transaction curtailments based on four rules: first come first serve, pro rata, minimum-net curtailment and price based are utilized to relieve congestion.

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Transmission management in the deregulated environment

Cited by 676 publications

References 23 publications

A resolução do problema de despacho ótimo de reativos pelo método da função lagrangiana-barreira relaxada

A resolução do problema de despacho ótimo de reativos pelo método da função lagrangiana-barreira relaxada

Transmission Line Loadability Improvement Using Facts Device

Variously worldwide types of deregulated electricity markets and their respective transmission congestion management schemes

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