Multi-objective coordinated droop-based voltage regulation in distribution grids with PV systems

Samadi, Afshin; Shayesteh, Ebrahim; Eriksson, Robert; Rawn, Barry; Söder, Lennart

doi:10.1016/j.renene.2014.05.046

Cited by 57 publications

(57 citation statements)

References 16 publications

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“…Parameters of the Q(V) characteristic, namely slope and voltage threshold, for PV systems in the true systems are set according to the proposed multiobjective coordinated DBV approach in [19] to minimize reactive power consumption. So, with the use of the Q(V) characteristic, one can expect a lower share of reactive power as compared to the GGC standard characteristic employed in the previous section.…”

Section: Further Applicationmentioning

confidence: 99%

“…This lies in the fact that the DBV reactive power control mechanism in PV systems operates based on a feedforward signal of the voltage, and so, when the voltage goes beyond thresholds of PV systems, reactive power consumption is commenced. Furthermore, the multiobjective coordinated DBV method tries to minimize reactive power consumption; this leads to a narrower range of activation band with high steep slopes for Q(V) characteristics [19]. In this regard, reactive power compensation units of PV systems kick in at relatively higher voltages with a steep rise.…”

Section: Further Applicationmentioning

confidence: 99%

“…Therefore, a different response behavior of distribution grids in terms of active and reactive power variations versus voltage variations on the transmission side can be expected. Moreover, high penetration of PV systems into distribution grids can cause local problems such as overvoltage [2]- [5], [8]- [19]. Different remedies have been proposed in literature to cope with overvoltage such as grid reinforcement [2], [5], on load tap changers for distribution transformers [5], [8], [9], active power curtailment [5], [10], [11], and reactive power control [5], [12]- [21].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Static Equivalent of Distribution Grids With High Penetration of PV Systems

Samadi

Söder

Shayesteh

et al. 2015

IEEE Trans. Smart Grid

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High penetrations of photovoltaic (PV) systems within load pockets in distribution grids have changed pure consumers to prosumers. This can cause technical challenges in distribution and transmission grids, such as overvoltage and reverse power flow. Embedding voltage support schemes into PVs, such as standard cos φ(P) characteristic proposed by the German grid codes, may cause more changes in the steady-state behavior of distribution grids and, in turn, the transmission side. Accordingly, it is important to properly model active distribution grids to analyze the system impacts of these changes to plan and operate future smart power grids. However, due to the high dimension of distribution grids, considering a detailed distribution grid to study the transmission side or a fraction of the distribution grid is either cumbersome or impractical. Therefore, it is required to develop a reasonable equivalent that can fairly capture the dominant behavior of the distribution grids. The aim of this paper is to use gray-box modeling concepts to develop a static equivalent of distribution grids comprising a large number of PV systems embedded with voltage support schemes. In the proposed model, the PV systems are aggregated as a separate entity, and not as a negative load, which is traditionally done. The results demonstrate the superior quality of the proposed model compared with the model with PV systems as the negative load.

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Section: Further Applicationmentioning

confidence: 99%

Section: Further Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Static Equivalent of Distribution Grids With High Penetration of PV Systems

Samadi

Söder

Shayesteh

et al. 2015

IEEE Trans. Smart Grid

Self Cite

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“…The local solutions for the over-voltage problem that have been broadly discussed are static/dynamic active power curtailment and reactive power support by PV inverters [7][8][9][10][11]. Various coordinated and centralized solutions based on reactive power support from the PV inverters have also been proposed [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Distributed control scheme for residential battery energy storage units coupled with PV systems

2017

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A distributed control method for residential battery energy storage (BES) units coupled with photovoltaic (PV) systems is presented. The objective is to utilize customer owned BES units for solving the over-voltage issues caused by high PV penetration without significantly affecting the BES owners local objectives. 24 hour ahead active power set points of the BES unit are calculated by an optimization based scheduling algorithm. The objective function is locally decided and the optimization is performed at the local level.The BES units are charged from the excess energy from the PV systems mostly during the period the grid is under risk of over-voltage. If the set points that were calculated by the optimization, turn out not to be able to maintain the voltages within the statutory limits in real time operation, the active power set points are modified. Reactive power is also utilized when active power is not sufficient. The new set points are calculated by a central controller. The performance of the proposed method is validated in a simulation study. It is shown that the residential BES units can successfully be utilized for solving over-voltage issues without significantly affecting the primary needs of the BES owners. Keywords

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“…Other papers suggest the VSI voltage control; mainly, when autonomous operation is required and/or a parallelism of the DG is performed. Thus, this operation is usually implemented by means of the droop control technique, in which the frequency control is performed by the active power droop curve and the voltage control is performed using the reactive power droop curve [6,10,11]. For optimizing the droop control performance it is possible to use an evolutionary algorithm to determine the best gains used in the active and reactive power curves [12e14].…”

Section: Introductionmentioning

confidence: 99%

Grid-tie three-phase inverter with active power injection and reactive power compensation

et al. 2016

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a b s t r a c tThis paper proposes a methodology for the active and reactive power flow control, applied to a grid-tie three-phase power inverter, considering local and/or regionalized power flow control necessity in the forthcoming distributed generation scenario. The controllers are designed by means of robust pole placement technique, which is determined using the Linear Matrix Inequalities with D-stability criteria. The linearized models used in the control design are obtained by means of feedback linearization, aiming to reduce system nonlinearities, improve the controller's performance and mitigate potential disturbances. Through multi-loop control, the power loop uses active and reactive power transfer adapted expressions to obtain the magnitude of the voltage and power transfer angle to control the power flow between the distributed generation and the utility grid. The methodology main idea is to obtain the best controllers with the lowest gains as possible placing the poles in the left-half s-plane region, resulting in fast responses with reduced oscillations. In order to demonstrate the feasibility of the proposal a 3 kVA three-phase prototype was implemented and a comparison with conventional controller is performed to demonstrate the proposed methodology performance. In addition, anti-islanding detection and protection against over/under voltage and frequency deviations are demonstrated through experimental results.

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Multi-objective coordinated droop-based voltage regulation in distribution grids with PV systems

Cited by 57 publications

References 16 publications

Static Equivalent of Distribution Grids With High Penetration of PV Systems

Static Equivalent of Distribution Grids With High Penetration of PV Systems

Distributed control scheme for residential battery energy storage units coupled with PV systems

Grid-tie three-phase inverter with active power injection and reactive power compensation

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