A synchronous machine model for unbalanced analyses

This paper presents a three-phase power-flow algorithm, in the sequence-component frame, for the microgrid ( grid) and active distribution system (ADS) applications. The developed algorithm accommodates single-phase laterals, unbalanced loads and lines, and three/four-wire distribution lines. This paper also presents steady-state sequence-component frame models of distributed energy resource (DER) units for the developed power-flow approach under balanced/unbalanced conditions. The DER models represent the synchronous-generator based and the electronically-coupled DER units. Both constant power (PQ) and regulated-voltage (PV) modes of operation of DER units are considered. The application of the developed power-flow method for two study systems is presented. The study results are validated based on comparison with the detailed solution of the system differential equations in time domain, using the PSCAD/EMTDC software tool.Index Terms-Active distribution systems, distributed energy resources (DER), microgrids, single-phase laterals, three-phase power flow.

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“…1) SG Unit: For the SG unit, the zero and negative sequence admittances of the generalized model are [31], [32] (4)…”

Section: B Negative and Zero Sequence Modelsmentioning

confidence: 99%

Unbalanced Model and Power-Flow Analysis of Microgrids and Active Distribution Systems

Kamh

Iravani

2010

IEEE Trans. Power Delivery

192

135

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“…Pumping-Up Generator 2.1 Phase coordinate model of variable-speed generator [8,11] Positive-, negative-, and zero-sequence circuit equations of primary (stator) and secondary (rotor) circuits of variable-speed generators on the D, Q reference frame rotating at a synchronous speed Z B 2Sf, f is the system frequency in hertz) may be expressed as follows (subscripts P, N, and O are added to voltage, current, and other variables):…”

Section: Phase Coordinate Model Of Variable-speedmentioning

confidence: 99%

“…The equations for the negative-sequence circuit can be derived in a similar way as the unbalanced model of synchronous machines [8]. Z m denotes rotor speed; I mD C and I mQ C denote auxiliary currents representing the effects of saturation [12]; p d / dt denotes differential operator.…”

Section: Phase Coordinate Model Of Variable-speedmentioning

confidence: 99%

“…The phase coordinate method has some excellent features [4], the primary one being that it can easily be used to analyze a power system which has elements of unsymmetrical impedance. The authors, considering the positive points, have presented the phase coordinate model of conventional synchronous machines [8], and power flow calculation and power system transient stability simulation methods, based on the phase coordinate method [9].…”

Section: Introductionmentioning

confidence: 99%

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Unbalanced power flow calculation of a power system containing a variable-speed generator

2000

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“…Earlier research efforts to extend power system analysis to unbalanced transients focused on modeling transformers and synchronous machines (Chen et al 1991), (Halpin et al 1993), (Tamura et al 1997) as individual components using symmetrical component or individual phase modeling techniques. To include analysis of the entire power system, a modeling framework using dynamic phasor technique was introduced in (Stankovic´ and Aydin 2000) for analyzing unbalanced faults in poly-phasor systems.…”

Section: Introductionmentioning

confidence: 99%

A Matlab-Based Simulation Tool For The Analysis Of Unsymmetrical Power System Transients In Large Networks

Kyesswa

Çakmak

Kühnapfel

et al. 2018

ECMS 2018 Proceedings Edited by Lars Nolle, Alexandra Burger, Christoph Tholen, Jens Werner, Jens Wellhausen

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This paper presents an extendable Matlab-based phasortime domain toolbox for modeling, simulation and analysis of unsymmetrical power system transients in large networks. Unlike most of the existing transient stability simulators which represent the transmission network on a per phase positive sequence basis, the new simulation function introduced in this paper is based on the symmetrical component technique which employs the three sequence networks. This representation allows consideration of network imbalances in order to include a wide range of disturbances during transient stability studies. The main aim of this paper is to describe the model details of the power system components required for unsymmetrical transients analysis and the solution methodology in the introduced simulation function. The performance of the simulation function is tested using standard IEEE test network models and the promising results are positively compared to respective results in DIgSILENT PowerFactory in terms of accuracy.

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A synchronous machine model for unbalanced analyses

Cited by 13 publications

References 2 publications

Unbalanced Model and Power-Flow Analysis of Microgrids and Active Distribution Systems

Unbalanced Model and Power-Flow Analysis of Microgrids and Active Distribution Systems

Unbalanced power flow calculation of a power system containing a variable-speed generator

A Matlab-Based Simulation Tool For The Analysis Of Unsymmetrical Power System Transients In Large Networks

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