Distributed generation modeling for power flow studies and a three-phase unbalanced power flow solution for radial distribution systems considering distributed generation

Moghaddas-Tafreshi, Seyed Masoud; Mashhour, Elaheh

doi:10.1016/j.epsr.2008.10.003

Cited by 204 publications

(117 citation statements)

References 15 publications

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“…In their analysis the buses with DG connection that yields small output power are modeled as PQ nodes while those with large DG output are considered as PV nodes. Similar study was also conducted by [14] in which asynchronous and synchronous DG units that are connected to grid via power converters are modeled as either PV or PQ nodes depending on control technique employed. Other models were also discussed in [15] that are based on the control of generator excitation and in this case the synchronous DGs together with static voltage regulators are modeled as PV nodes.…”

Section: Dg Resources and Conversion Devices Modelingmentioning

confidence: 99%

A Review of Distributed Generation Resource Types and Their Mathematical Models for Power Flow Analysis

Musa¹

2015

IJSTS

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Abstract:The emergence of Distributed Generation (DG) in distribution network has changed the configuration of this century's power system in terms of power flow. The reason for this is that DG affects the power flow and voltage conditions in the distribution system; contrary to its traditional unidirectional nature in radial configuration. It is worth mentioning that the change in the direction of power flow is not limited to the distribution network, but can as well extend to the transmission or sub-transmission systems, especially when DG penetration is high. This paper gives an overview of DG types and modeling techniques of the DG for power flow analysis during planning and operations. Various DG technologies are highlighted, different models of DGs are presented and some key challenges ahead with current drive towards smart grid networks is also discussed.

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Section: Dg Resources and Conversion Devices Modelingmentioning

confidence: 99%

A Review of Distributed Generation Resource Types and Their Mathematical Models for Power Flow Analysis

Musa¹

2015

IJSTS

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“…For the general analysis, all of these RESs can be presented as DGs that operate in constant voltage (PV) or constant power (PQ) mode based on their characteristics. Moreover, from the recent advancement in the power electronic field, it is possible for some RESs to operate in both modes [21]. Furthermore, some researchers also considered the cost of operation and its availability in the analysis.…”

Section: Related Researchmentioning

confidence: 99%

Comparative learning global particle swarm optimization for optimal distributed generations' output

Jamian¹,

Mokhlis²,

Mustafa³

et al. 2014

Turk J Elec Eng & Comp Sci

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Abstract:The appropriate output of distributed generation (DG) in a distribution network is important for maximizing the benefit of the DG installation in the network. Therefore, most researchers have concentrated on the optimization technique to compute the optimal DG value. In this paper, the comparative learning in global particle swarm optimization (CLGPSO) method is introduced. The implementation of individual cognitive and social acceleration coefficient values for each particle and a new fourth term in the velocity formula make the process of convergence faster. This new algorithm is tested on 6 standard mathematical test functions and a 33-bus distribution system. The performance of the CLGPSO is compared with the inertia weight particle swarm optimization (PSO) and evolutionary PSO methods. Since the CLGPSO requires fewer iterations, less computing time, and a lower standard deviation value, it can be concluded that the CLGPSO is the superior algorithm in solving small-dimension mathematical and simple power system problems.

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“…The Developed model has active and reactive power expressions in terms of induction machine impedance parameters, input power and terminal voltages. In the Developed model, magnitude of the positive-sequence rotor side voltage is expressed via bi-quadratic equation, which is generally used to calculate node voltages in the load flow analysis [10,11,14,18,19]. In the study of Feijôo and Villanueva [18], a slightly modified model of the Eminoglu et al study [10] is given and the advantages of the bi-quadratic equation based models are highlighted.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, the need for a solution for complex phase currents/voltages brings extra computational complexity for power flow analysis. Therefore, in most of the unbalanced power flow analyses in the literature, asynchronous generators are modeled as balanced and fixed Active (P)-Reactive (Q) Power sources by ignoring the effect of the imbalance (Constant P, Q Model) [14][15][16]. In some studies, this simplified model has been updated by the calculation of the reactive power demand from the grid.…”

Section: Introductionmentioning

confidence: 99%

“…In some studies, this simplified model has been updated by the calculation of the reactive power demand from the grid. For this purpose, the reactive power demanded from the grid brought into a function of positive sequence voltage (V sp ) and machine impedance parameters, and, thereby, this updated model has been applied to power flow analysis (Constant P, Q(V sp ) Model) [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Wind Turbine Generating System Model for Balanced and Unbalanced Distribution Systems Load Flow Analysis

et al. 2018

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Abstract:Wind turbine generating systems (WTGSs), which are conventionally connected to high voltage transmission networks, have frequently been employed as distributed generation units in today's distribution networks. In practice, the distribution networks always have unbalanced bus voltages and line currents due to uneven distribution of single or double phase loads over three phases and asymmetry of the lines, etc. Accordingly, in this study, for the load flow analysis of the distribution networks, Conventional Fixed speed Induction Generator (CFIG) based WTGS, one of the most widely used WTGS types, is modelled under unbalanced voltage conditions. The Developed model has active and reactive power expressions in terms of induction machine impedance parameters, terminal voltages and input power. The validity of the Developed model is confirmed with the experimental results obtained in a test system. The results of the slip calculation based phase-domain model (SCP Model), which was previously proposed in the literature for CFIG based WTGSs under unbalanced voltages, are also given for the comparison. Finally, the Developed model and the SCP model are implemented in the load flow analysis of the IEEE 34 bus test system with the CFIG based WTGSs and unbalanced loads. Thus, it is clearly pointed out that the results of the load flow analysis implemented with both models are very close to each other, and the Developed model is computationally more efficient than the SCP model.

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Distributed generation modeling for power flow studies and a three-phase unbalanced power flow solution for radial distribution systems considering distributed generation

Cited by 204 publications

References 15 publications

A Review of Distributed Generation Resource Types and Their Mathematical Models for Power Flow Analysis

A Review of Distributed Generation Resource Types and Their Mathematical Models for Power Flow Analysis

Comparative learning global particle swarm optimization for optimal distributed generations' output

A New Wind Turbine Generating System Model for Balanced and Unbalanced Distribution Systems Load Flow Analysis

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