Modeling of Step Voltage Regulators in Multiphase Load Flow Solution of Distribution Systems Using Newton's Method and Augmented Nodal Analysis

Cetindag, Baki; Koçar, Ilhan; Gueye, Assane; Karaagac, Ulas

doi:10.1080/15325008.2017.1363322

Cited by 17 publications

(30 citation statements)

References 12 publications

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“…Authors in [2] claim that the power flow methods of [1] and [2] produce the most probable power flow solution by accurately simulating the actual switching sequence of LVCs. It is pointed out that all methods described above (except [10] and [12]) neglect the network unbalances and the variety of DG operational modes investigating only single-phase networks.…”

Section: B Literature Reviewmentioning

confidence: 99%

A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

Pompodakis¹,

Ahmed²,

Alexiadis³

2021

Preprint

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Local voltage controllers (LVCs) are important components of a modern distribution system for regulating the voltage within permissible limits. This manuscript presents a sensitivity-based three-phase weather-dependent power flow algorithm for distribution networks with LVCs. This Part I presents the theoretical development of the proposed algorithm, which has four distinct characteristics: a) it considers the three-phase unbalanced nature of distribution systems, b) the operating state of LVCs is calculated using sensitivity parameters, which accelerates the convergence speed of the algorithm, c) it considers the precise switching sequence of LVCs based on their reaction time delays, and d) the nonlinear influence of weather variations in the power flow is also taken into consideration. Simulations and validation results presented in Part II indicate that the proposed approach outperforms other existing algorithms with respect to the accuracy and speed of convergence, thus making it a promising power flow tool for accurate distribution system analysis. <div> </div>

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Section: B Literature Reviewmentioning

confidence: 99%

A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

Pompodakis¹,

Ahmed²,

Alexiadis³

2021

Preprint

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“…It is important to point out that transformers and regulators are modeled as in [20,32]. In addition, fixed regulator taps are considered as published in [24]. In order to provide a fair validation, the obtained results are compared with the ones obtained by means of the Z Bus method [20,33] and of the open source distribution system simulator (OpenDSS) [34], being the latter a reference tool released by the Electric Power Research Institute (EPRI).…”

Section: Validation: Ieee 8500-node Test Feedermentioning

confidence: 99%

“…As a result, it converges for weakly meshed configuration only under some specific assumptions, as pointed out in [21]. A different formulation of the power-flow analysis for both power transmission and distribution networks by means of a circuital interpretation of the network and the application of classical tools for circuit analysis are instead presented in [22][23][24], offering a general solution with improved convergence for very large structures including weakly and heavily meshed structures.…”

Section: Introductionmentioning

confidence: 99%

An Iterative Scheme for the Power-Flow Analysis of Distribution Networks based on Decoupled Circuit Equivalents in the Phasor Domain

et al. 2020

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This paper presents an alternative solution for the power-flow analysis of power systems with distributed generation provided by heterogeneous sources. The proposed simulation approach relies on a suitable interpretation of the power network in terms of a nonlinear circuit in the phasor domain. The above circuit interpretation can be solved directly in the frequency-domain via the combination of a standard tool for circuit analysis with an iterative numerical scheme, providing directly the steady-state solution of the power-flow of a generic distribution network. At each iteration, the resulting circuit turns out to be composed by two decoupled subnetworks, a large linear part and a set of smaller nonlinear pieces accounting for the load characteristics, with evident benefits in terms of the computational time. The feasibility and strength of the proposed simulation scheme have been verified on a large benchmark consisting of the IEEE 8500-node test feeder. Then it is applied to the statistical simulation of a power network accounting for the variability effects of renewable generators. According to the results, the proposed tool provides an effective alternative to the state-of-the-art approaches for power-flow analysis further highlighting the benefits of the application of well-established tools for circuit analysis to power-flow problems.

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“…Several methods have been proposed in the literature for the integration of SVRs in the power flow calculation [2]- [4]. More specifically, the authors in [2] and [3] propose a mathematical formulation relating the primary and secondary voltages and currents, which is solved using the backward/forward sweep (BFS) method.…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, the authors in [2] and [3] propose a mathematical formulation relating the primary and secondary voltages and currents, which is solved using the backward/forward sweep (BFS) method. Furthermore, in [4], the SVR equations are directly integrated in the Jacobian matrix. However, these approaches are not applicable to the Z-Bus power flow method since the SVR equations of [2]- [4] are not compatible with the formation of YBUS matrix.…”

Section: Introductionmentioning

confidence: 99%

Efficient Integration of Three-Phase Step Voltage Regulators in the Z-Bus Power Flow Method

Pompodakis¹

2021

Preprint

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This letter presents a comprehensive Step Voltage Regulator (SVR) model suitable for the three-phase ZBUS power flow. The model can be applied in all SVR configurations such as open delta, close delta, wye. Its advantage is that the tap variations are simulated outside the YBUS matrix, without compromising the convergence of the power flow. Therefore, a refactorization of the YBUS matrix is not required after every tap change reducing significantly the computation time of the power flow. The proposed SVR model is validated in a 4-Bus network, while its performance is tested in the IEEE 8500-Node test feeder.

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Modeling of Step Voltage Regulators in Multiphase Load Flow Solution of Distribution Systems Using Newton's Method and Augmented Nodal Analysis

Cited by 17 publications

References 12 publications

A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

An Iterative Scheme for the Power-Flow Analysis of Distribution Networks based on Decoupled Circuit Equivalents in the Phasor Domain

Efficient Integration of Three-Phase Step Voltage Regulators in the Z-Bus Power Flow Method

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