Modelagem de ramos de impedância nula no problema de fluxo de potência ótimo

Rosas, Gracita Batista; Lourenço, Elizete Maria; Fernandes, Thelma Solange Piazza

doi:10.1590/s0103-17592012000600009

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…As a consequence, this modeling allows for the direct determination of the power flow distribution through the components of substations, which is necessary for the analysis of electrical device loading, especially in circuit breakers. Preliminary studies demonstrated the feasibility of modeling at the substation level in the formulation of the OPF problem [33].…”

Section: Introductionmentioning

confidence: 99%

An Expeditious Methodology to Assess the Effects of Intermittent Generation on Power Systems

et al. 2019

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This paper proposes an expeditious methodology that provides hourly assessments of the effect of intermittent wind and solar power generation on the electrical quantities characterizing power systems. Currents are measured via circuit breakers to confirm the correct sizing of devices based on their rated currents. Nodal voltage magnitudes are assessed for compliance with limits imposed by regulatory authorities, whereas the active power produced by hydroelectrical generators is assessed for reserve energy. The proposed methodology leverages a fuzzy extended deterministic optimal power flow that uses in power balance equations the average hourly values of active power generated by wind and solar sources as well as hourly energy load. The power grid is modeled at the substation level to directly obtain power flow through circuit breakers. Uncertainties in power system electrical quantities are assessed for an optimal solution using a Taylor series associated with deviations from the average values of the active power produced by the wind and solar sources. These deviations are represented using a fuzzy triangular model reflecting the approximations of the probability density functions of these powers. The methodology takes into account a subjective investigation that focuses on the qualitative characteristic of these energy sources’ behaviors.

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Section: Introductionmentioning

confidence: 99%

An Expeditious Methodology to Assess the Effects of Intermittent Generation on Power Systems

et al. 2019

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An Alternative Way to Model Switches and Circuit Breakers to Directly Determine Short-Circuit Currents Flowing Through Them

Duarte

Fernandes

Lourenço

2014

J Control Autom Electr Syst

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This paper proposes an extension of the traditional mathematical formulation of short-circuit analysis in order to make it able to process networks modeled at bussection level. Differently from the existing methodology for calculating short-circuit currents, which is based on the conventional bus-branch network model, the proposed approach processes networks modeled at the physical level, allowing the direct determination of short-circuit currents through closed-circuit breakers. For this purpose, the current through circuit breakers is included in the problem as a new state variable. Besides, information regarding the closed status position of circuit breakers is taken into account as additional linear equations, producing a non-redundant set of algebraic equations. The proposed approach provides an efficient tool for directly determining the short-circuit current flowing through circuit breakers into a selected substation of the network, avoiding unreliable artifices and tedious postprocessing procedures required by the existing methodology, which is based on the bus/branch model. Simulations conducted on a five-bus test system and a 291-bus test system are used to illustrate the proposed methodology.

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Modelagem de ramos de impedância nula no problema de fluxo de potência ótimo

Cited by 2 publications

References 15 publications

An Expeditious Methodology to Assess the Effects of Intermittent Generation on Power Systems

An Expeditious Methodology to Assess the Effects of Intermittent Generation on Power Systems

An Alternative Way to Model Switches and Circuit Breakers to Directly Determine Short-Circuit Currents Flowing Through Them

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