Direct Incorporation of Fault Level Constraints in Optimal Power Flow as a Tool for Network Capacity Analysis

Vovos, Panagis N.; Białek, Janusz

doi:10.1109/tpwrs.2005.856975

Cited by 96 publications

(78 citation statements)

References 6 publications

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“…s ij = 1) constraints (40)- (41) recover original active/reactive power flow thermal limits, (42) and (43) take the same form as (39) and (36), and (44)- (45) provides the same outcome as (26)-(27) i.e. W ij = W ji and T ij = −T ji .…”

Section: ) Constraints Modeling the Status Of Lines With Remotely Comentioning

confidence: 99%

A Comprehensive Centralized Approach for Voltage Constraints Management in Active Distribution Grid

Capitanescu

Bilibin

Ramos

2014

IEEE Trans. Power Syst.

115

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Abstract-This paper deals with the management of voltage constraints in active distribution systems that host a significant amount of distributed generation (DG) units. To this end we propose a centralized optimization approach which aims at minimizing the amount of MW curtailment of non-firm DG to remove voltage constraints. The salient feature of this approach is that it comprehensively and properly models the full variety of possible control means (i.e. DG active/reactive power including DG shut-down, on load tap changing transformer ratio, shunt capacitor, and remotely controlled switches or breakers), most of which having a discrete behavior. We develop and compare the performances of two optimization models on a snapshot basis for various distribution systems up to 1089 buses. In particular we show that the use of remotely controlled switches so as to transfer DG between feeders in case of voltage constraints may lead to significant reduction of the DG curtailment.

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Section: ) Constraints Modeling the Status Of Lines With Remotely Comentioning

confidence: 99%

A Comprehensive Centralized Approach for Voltage Constraints Management in Active Distribution Grid

Capitanescu

Bilibin

Ramos

2014

IEEE Trans. Power Syst.

115

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“…A number of studies have adopted metaheuristics techniques, such as genetic algorithms [12][13][14], but analytical approaches have also been proposed [15,16]. The use of linear programming was demonstrated in [17,18], whereas the non-linear formulation based on the AC Optimal Power Flow (OPF) problem was adopted in [1,[4][5][6][19][20][21].…”

Section: Distribution Network Capacity Assessment [1]mentioning

confidence: 99%

“…An AC OPF-like (reduced gradient) method applied to a (power) loss minimisation problem was proposed in [19]. However, in this and other OPF-based approaches [20,21]…”

Section: Minimising Energy Losses [2]mentioning

confidence: 99%

“…[3,6] Only a few capacity assessment studies have considered fault level contributions from DG [10,11,13,18]. Fault level constraints were formally included in the OPF approach presented in [21], where the corresponding derivatives with respect to the OPF variables were obtained by expressing the bus Z as a function of new capacity. It used a highly complex series of matrix operations to enact this and works well in meshed networks.…”

Section: Incorporating More Network Constraintsmentioning

confidence: 99%

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Using AC Optimal Power Flow for DG planning and optimisation

Ochoa

Harrison

2010

IEEE PES General Meeting

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Abstract-While it is difficult to estimate how much distributed generation (DG) capacity will be connected to distribution systems in the coming years, it is certain that increasing penetration levels require robust tools that help assess the capabilities and requirements of the networks in order to produce the best planning strategies. This work presents an overview of some of the uses to which a tailored AC Optimal Power Flow (OPF) can be applied to DG planning and optimisation. Its application to maximising connectable capacity and energy loss minimisation are presented and discussed. The incorporation of a wide range of network constraints, including fault levels, voltage step change and N-1 security are also outlined. The AC OPF technique is extended to a multi-period approach to cater for the variability of demand and renewable generation. Advanced smart grid-like control strategies are also incorporated into this planning tool in order to evaluate the potential benefits. Simple test feeders as well as generic UK distribution systems are adopted to demonstrate the methodology.Index Terms-Distributed generation, optimal power flow, active network management, wind power, distribution networks.

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“…In this work, fault levels will be included in the OPF as a constraint. Rather than the computationally intensive direct incorporation of such constraints [12], for simplicity, DG fault contributions are considered to be linearly dependent on their rated current [11,13].…”

Section: Fault Levelsmentioning

confidence: 99%