Implementing Transformer Nodal Admittance Matrices Into Backward/Forward Sweep-Based Power Flow Analysis for Unbalanced Radial Distribution Systems

Wang, Zhuding; Fen, Chen; Li, Jingui

doi:10.1109/tpwrs.2004.835659

Cited by 76 publications

(42 citation statements)

References 24 publications

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“…respectively. By introducing the voltage calculation process to other nodes based on (A.1) and (A.2), the formula to calculate node voltage can be expressed in general form as (17).…”

Section: Resultsmentioning

confidence: 99%

“…The most common DT models are based on nodal admittance matrices [12~18]. But for the forward/backward sweep based methods, the nodal admittance matrices based models are proved to be difficult to be used and claimed to be unsatisfactory due to relatively slow convergence problems [17]. It may also cause singularity in the connection matrix which appears on some special connection types such as delta-grounded wye or grounded wye-delta transformers.…”

Section: Introductionmentioning

confidence: 99%

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A Three-phase Hybrid Power Flow Algorithm for Meshed Distribution System with Transformer Branches and PV Nodes

Li¹,

Wu²,

Jiang³

et al. 2016

Journal of Electrical Engineering and Technology

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-Aiming at analyzing the power flow of the distribution systems with distribution transformer (DT) branches and PV nodes, a hybrid three-phase power flow methodology is presented in this paper. The incidence formulas among node voltages, loop currents and node current injections have been developed based on node-branch incidence matrix of the distribution network. The method can solve the power flow directly and has higher efficiency. Moreover, the paper provides a modified method to model DT branches by considering winding connections, phase shifting and off-nominal tap ratio, and then DT branches could be seen like one transmission line with the proposed power flow method. To deal with the PV nodes, an improved approach to calculate reactive power increment at each PV node was deduced based on the assumption that the positive-sequence voltage magnitude of PV node is fixed at a given value. Then during calculating the power flow at each iteration, it only needs to update current injection at each PV node with the proposed algorithm. The process is very simple and clear. The results of IEEE 4 nodes and the modified IEEE 34 nodes test feeders verified the correctness and efficiency of the proposed hybrid power flow algorithm.

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“…respectively. By introducing the voltage calculation process to other nodes based on (A.1) and (A.2), the formula to calculate node voltage can be expressed in general form as (17).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Three-phase Hybrid Power Flow Algorithm for Meshed Distribution System with Transformer Branches and PV Nodes

Li¹,

Wu²,

Jiang³

et al. 2016

Journal of Electrical Engineering and Technology

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show abstract

“…In this case, calculating the neutral current component according to the Kron reduction as in (A3) yields (18) and the ground current component is given by (19) According to the concept introduced in [34] for the formulation of the BCDLA method, in the presence of the partition of a specified current into various components, the losses associated to each component are proportional to the projection of the phasor representing that current component onto the phasor representing the specified current. The application of this concept to the current components and of phase yields, respectively, (20) and (21) Analogously, it is possible to calculate the expressions of the components for phase and phase as follows:…”

Section: Relationships Among the Loss Partitioning Results And Thementioning

confidence: 99%

Loss Partitioning and Loss Allocation in Three-Phase Radial Distribution Systems With Distributed Generation

Carpaneto

Chicco

Sumaili

2008

IEEE Trans. Power Syst.

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In this paper, the concepts related to loss partitioning among the phase currents in three-phase distribution systems are revisited in the light of new findings identified by the authors. In particular, the presence of a paradox in the classical loss partitioning approach, based on the use of the phase-by-phase difference between the input and output complex power, is highlighted. The conditions for performing effective loss partitioning without the occurrence of the paradox are thus established. The corresponding results are then used to extend the branch current decomposition loss allocation method for enabling its application to three-phase unbalanced distribution systems with distributed generation. Several numerical examples on a three-phase line with grounded neutral and on the modified IEEE 13-node test system are provided to assist the illustration and discussion of the novel conceptual framework.

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“…The paper presents, in two parts, the numerical results of the application of the two methods of harmonic impedance analysis: a classical method based on harmonic nodal admittance matrix calculation (Wang et al, 2004), (Bergen & Vittal, 2000), respectively a modern method based on matrix calculation system status automatically associated to the network distribution (Sano & Furuta, 1988;Meliopoulus et al, 1994;Martinon et al, 1996), (Buta et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Identify Resonant Frequencies in AC Distribution Networks – A Numerical Example Part I – Harmonic Nodal Admittance Matrix Method

Pană

Baloi

2015

Procedia - Social and Behavioral Sciences

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The subject of the paper is part of the general issue, particularly complex, establishing the means and methods of intervention for maintaining an appropriate quality of power supplied to consumers connected to existing distribution networks, which are subject to more pronounced harmonic pollution. In this context, the analysis in the frequency domain of the normal operating regimes of electrical distribution networks is a mandatory operation, the main instrument being the harmonic impedance seen in the network buses nodes. A typical application of this tool of analysis refers to reactive power compensation in distribution network harmonic polluted, operation that may lead to increased non-sinusoidal regime and consequently to increased negative effects on the operating of installations belonging to the supplier or consumers. Avoidance of harmonic resonances is possible only by knowing the frequency response of the network, more exactly the change of harmonic impedance seen in the network buses. This paper presents, in two parts, the numerical examples carried out on the same area of a real distribution network, two analytical methods: harmonic nodal admittance matrix method, respectively state matrix method. The results are analyzed and compared with the values obtained by the two methods.

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Implementing Transformer Nodal Admittance Matrices Into Backward/Forward Sweep-Based Power Flow Analysis for Unbalanced Radial Distribution Systems

Cited by 76 publications

References 24 publications

A Three-phase Hybrid Power Flow Algorithm for Meshed Distribution System with Transformer Branches and PV Nodes

A Three-phase Hybrid Power Flow Algorithm for Meshed Distribution System with Transformer Branches and PV Nodes

Loss Partitioning and Loss Allocation in Three-Phase Radial Distribution Systems With Distributed Generation

Identify Resonant Frequencies in AC Distribution Networks – A Numerical Example Part I – Harmonic Nodal Admittance Matrix Method

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