Fischer-Burmeister-Based Method for Calculating Equilibrium Points of Droop-Regulated Microgrids

Díaz, Guzmán; González-Morán, Cristina

doi:10.1109/tpwrs.2011.2175754

Cited by 39 publications

(32 citation statements)

References 18 publications

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“…Note that when the generation of a dispatchable DG unit reaches its rating, its control mode will change from dispatchable mode into constant power mode, and thus will form a PQ bus when operating in this mode [23], [24]. The bus type will not change on the fly, instead, the rating limitation check is after the whole power flow calculation process, and if there is certain constraint being violated, we have to recalculate with new bus type assignment for the correspondent buses.…”

Section: B Mathematical Model Of Power Flow In Ac Microgridmentioning

confidence: 99%

Power flow analysis for low-voltage AC and DC microgrids considering droop control and virtual impedance

Chaudhary

Savaghebi

et al. 2017

2017 IEEE Manchester PowerTech

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Abstract-In the Low-Voltage (LV) AC microgrids (MGs),with a relatively high R/X ratio, virtual impedance is usually adopted to improve the performance of droop control applied to Distributed Generators (DGs). At the same time, LV DC microgrid using virtual impedance as droop control is emerging without adequate power flow studies. In this paper, power flow analyses for both AC and DC microgrids are formulated and implemented. The mathematical models for both types of microgrids considering the concept of virtual impedance are used to be in conformity with the practical control of the distributed generators. As a result, calculation accuracy is improved for both AC and DC microgrid power flow analyses, comparing with previous methods without considering virtual impedance. Case studies are conducted to verify the proposed power flow analyses in terms of convergence and accuracy. Investigation of the impact to the system of internal control parameters adopted by distributed generators is also conducted by using proposed method. Index

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Section: B Mathematical Model Of Power Flow In Ac Microgridmentioning

confidence: 99%

Power flow analysis for low-voltage AC and DC microgrids considering droop control and virtual impedance

Chaudhary

Savaghebi

et al. 2017

2017 IEEE Manchester PowerTech

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“…This is the case of the Backward/Forward sweep (BFS) sequential methods and some direct methods, as for instance [12], [13]. In [14] the BFS method was applied to develop a general four-wire distribution network approach.…”

Section: Nomenclaturementioning

confidence: 99%

“…The application of the dq0 reference frame to the power flow formulation is not new [16], and it has been recently used in microgrids steady-state modeling [12], and in unified AC/DC power flow analysis [13]. However, in those cases the dq0 reference frame is applied to balanced systems, so the dq0 components are constant in steady state analysis.…”

Section: Nomenclaturementioning

confidence: 99%

“…The proposed formulation is based on the application of KCL and KVL like the BFS methods. In this particular case, the authors chose a direct approach [12], [13] to simultaneously solve the whole system of equations by means of the trust-region dogleg algorithm [27]. However, other algorithms could be used to solve the proposed formulation.…”

Section: Nomenclaturementioning

confidence: 99%

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Unbalanced Power Flow in Distribution Systems With Embedded Transformers Using the Complex Theory in <formula formulatype="inline"> <tex Notation="TeX">$\alpha \beta 0\;$</tex></formula> Stationary Reference Frame

Arboleya

González-Morán

Coto

2014

IEEE Trans. Power Syst.

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Abstract-This paper presents three new contributions to power flow analysis of unbalanced three-phase distribution systems. First, a complex vector based model in αβ0 stationary reference frame is developed to state the power flow equations using a compact matrix formulation. The proposed model is based on Kirchhoff' s current law (KCL) and Kirchhoff' s voltage law (KVL). Then, a general and exact power transformer model in the αβ0 reference frame is proposed. Finally, this transformer model is incorporated into the power flow problem. It will be shown that the use of an orthogonal reference frame simplifies the modeling of the distribution network components. In this work, both the network and the power transformer, as well as PQ type loads, PQ and PV type generators and a slack bus are modeled. By using the node incidence matrix instead of the admittance matrix, the information about the grid topology and the grid parameters (including power transformers) is separately organized. As it will be demonstrated, the proposed formulation is ready to incorporate other complex models of loads, generators or storage devices. The model is tested by using the IEEE 4 and the IEEE 123 Node Test Feeders with different transformer connections and balanced and unbalanced lines and loads.

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“…Droop control is a key strategy for controlling IMG systems [1][2][3]. Given its special philosophy of operation; the operational planning techniques of droop-controlled IMG systems are different than those adopted in conventional power system in terms of the system's special operational characteristics and the models used to represent it.…”

Section: Introductionmentioning

confidence: 99%

Maximum loadability consideration in droop-controlled islanded microgrids optimal power flow

Abdelaziz

El-Saadany

2014

Electric Power Systems Research

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Fischer-Burmeister-Based Method for Calculating Equilibrium Points of Droop-Regulated Microgrids

Cited by 39 publications

References 18 publications

Power flow analysis for low-voltage AC and DC microgrids considering droop control and virtual impedance

Power flow analysis for low-voltage AC and DC microgrids considering droop control and virtual impedance

Unbalanced Power Flow in Distribution Systems With Embedded Transformers Using the Complex Theory in <formula formulatype="inline"> <tex Notation="TeX">$\alpha \beta 0\;$</tex></formula> Stationary Reference Frame

Maximum loadability consideration in droop-controlled islanded microgrids optimal power flow

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