An Efficient Three Phase Four Wire Radial Power Flow Including Neutral-Earth Effect

Acosta, Camilo J.; Isaza, Ricardo Alberto Hincapié; Echeverri, Mauricio Granada; Escobar, Antonio; Gallego, Ramón Alfonso

doi:10.1007/s40313-013-0049-7

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…The results in Fig. 6a are comparable with the result in [38] for 8% load unbalance. a) Assuming neutral impedance is equal to phase impedance b) Assuming neutral impedance is twice the phase impedance Fig.…”

Section: B Losses In the Neutralsupporting

confidence: 81%

Optimized Dispatch of Energy Storage Systems in Unbalanced Distribution Networks

Watson

Lestas

2018

IEEE Trans. Sustain. Energy

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This paper presents a method to achieve optimal active and reactive power contributions from each energy storage system in an unbalanced distribution network to minimize power loss, while ensuring network current and voltage constraints are satisfied. By modelling loads as either constant current or constant impedance, the AC optimal power-flow is transformed into a noniterative convex optimization problem. The application of capacity constraints, voltage constraints, and energy storage constraints in an unbalanced three-phase four-wire system is considered, addressing specific issues pertaining to unbalanced networks such as voltage unbalance and neutral voltage displacement. The proposed method is then used to demonstrate optimized dispatch of energy storage systems in a suitable four-wire unbalanced distribution test network. The contribution of losses in the neutral wire to the total losses is also determined for a test system under a range of operating conditions and various neutral earthing systems, highlighting the importance of considering this in a typical unbalanced distribution network.

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Section: B Losses In the Neutralsupporting

confidence: 81%

Optimized Dispatch of Energy Storage Systems in Unbalanced Distribution Networks

Watson

Lestas

2018

IEEE Trans. Sustain. Energy

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“…The objective is to minimize the weighted sum of all the difference between measured and estimated variables z −h x ð Þ ð Þ. Matrix W includes the inverse of the variances of errors of each measurement. The objective, weighted squared error [Equation (13)] is subject to the system model [Equation (12)] discussed in detail in Section 2 that reflects the network equilibria as a function of the OpenDSS's system admittance matrix Y [Equation (8)].…”

Section: System State Estimation Formulationmentioning

confidence: 99%

“…8,9 Despite the use of three-phase models is considered enough to analyze legacy distribution systems, emerging multiphase-multiground network models are gaining relevance in the design tasks of next-generation distribution systems. [10][11][12][13][14] The OpenDSS 10 is a simulation platform developed by the Electric Power Research Institute (EPRI) based on a standardized multiphase and multigrounded network model. This tool can determine NEVs at steady-state and shortcircuit conditions.…”

Section: Introductionmentioning

confidence: 99%

Theneutral‐earth‐voltage(NEV) system state estimation model

Jesús

Celeita

Ramos

2020

Int Trans Electr Energ Syst

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Summary Next‐generation distribution systems will be characterized by higher unbalanced currents due to increased asymmetrical currents produced by fast charging of electric vehicles and high short‐circuit currents under meshed operation. The unbalanced currents flowing through earthing impedances produce neutral‐earth voltages (NEVs) that may compromise the security (IEEE 62.92) and the safety (IEEE 80) of the system. Existing PMU‐based distribution system state estimation (PMU‐DSSE) methods described in literature are unable to estimate neutral‐earth voltages. To fulfill the research gap, this paper presents a new PMU‐DSSE formulation capable to estimate NEVs taking advantage of the OpenDSS's multiphase network model. The proposed procedure was successfully applied in two well‐known NEV test cases modeled in the OpenDSS platform.

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“…The reduction is achieved based on the fact that all the unbalanced return current is through the neutral wire and the ground has no role in this case. In [9], the author includes the phase to neutral voltage in a Backward Forward Sweep (BFS) method when calculating nodal current injection, but uses a 4 × 4 impedance matrix for the power flow solution.…”

Section: A Relevant Literaturementioning

confidence: 99%

Impedance modelling for European style Distribution Feeder

Koirala

D’hulst²,

Hertem

2019

2019 International Conference on Smart Energy Systems and Technologies (SEST)

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This paper discusses the methods of modelling a European style TT grounded low voltage (LV) distribution system without increasing computational complexity and with increased accuracy. The conventional Kron's reduction neglects the effect of the neutral current return path through the neutral conductor. While a four-wire model gives accurate power flow results with the possibility to monitor the neutral voltage, it also increases the computational burden. In this paper, a novel reduction method is proposed for European style TT grounded low voltage distribution systems to an equivalent three-wire system without neglecting the impact of the neutral voltage.

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An Efficient Three Phase Four Wire Radial Power Flow Including Neutral-Earth Effect

Cited by 12 publications

References 17 publications

Optimized Dispatch of Energy Storage Systems in Unbalanced Distribution Networks

Optimized Dispatch of Energy Storage Systems in Unbalanced Distribution Networks

Theneutral‐earth‐voltage(NEV) system state estimation model

Impedance modelling for European style Distribution Feeder

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