Network Partition and Voltage Coordination Control for Distribution Networks With High Penetration of Distributed PV Units

Chai, Yuanyuan; Guo, Li; Wang, Chengshan; Zhao, Zongzheng; Du, Xiaofeng; Pan, Jui-Wen

doi:10.1109/tpwrs.2018.2813400

Cited by 169 publications

(99 citation statements)

References 23 publications

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“…The electrical distance is a measure of the electrical connectedness among the nodes. Various measures of the electrical distance have been proposed [14] but the most commonly used involves the Jacobian matrix of the load flow equations and its inverse, named sensitivity matrix. Adopting and extending the approach outlined in [15], various definitions of the electrical distance are proposed in this paper, based on the sensitivity coefficients derived from the linear model recalled in Section 2 with respect to both active and reactive powers.…”

Section: Zoning Methodologiesmentioning

confidence: 99%

“…This approach guarantees the optimal solution for each VCZ and it requires a communication infrastructure lighter than the centralized control [11,12].The division of the network in VCZs require the definition of an electrical distance, a clustering criterion and, in some case, a clustering quality index [13]. In literature, various measures of the electrical distance have been proposed, based on geographical distance, line impedance, voltage sensitivity coefficients [14] and the most commonly used involves the sensitivity of the nodal voltages to the reactive power injections [13,[15][16][17][18][19][20][21]. Such an approach is typically adopted for the secondary voltage control in transmission systems.…”

mentioning

confidence: 99%

“…In [23] a modified electrical distance is proposed combining the voltage sensitivities in [11,12] with the conventional definition of electrical distances derived from the line impedance measure. Moreover, there are also many methods for grouping the nodes with similar electrical distances in VCZs, such as hierarchical clustering [11,13,16,17], K-means clustering [18], genetic algorithms [19,24].In this paper, extending and improving the approach proposed in [14], a partition of the distribution network in VCZs that account for the sensitivities of the nodal voltages to active and reactive powers is firstly proposed and then applied to optimize the voltage profiles of the distribution feeders with DERs. In particular, using the sensitivity coefficients derived from the linear method for the steady-state analysis of the distribution system in [25,26], various definitions of the electrical distance are proposed in this paper, which consider separately or simultaneously the dependence of the nodal voltages on active and reactive power injections, independently from the number and position of the DERs.…”

mentioning

confidence: 99%

“…In this paper, extending and improving the approach proposed in [14], a partition of the distribution network in VCZs that account for the sensitivities of the nodal voltages to active and reactive powers is firstly proposed and then applied to optimize the voltage profiles of the distribution feeders with DERs. In particular, using the sensitivity coefficients derived from the linear method for the steady-state analysis of the distribution system in [25,26], various definitions of the electrical distance are proposed in this paper, which consider separately or simultaneously the dependence of the nodal voltages on active and reactive power injections, independently from the number and position of the DERs.…”

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confidence: 99%

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Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources

2019

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This paper deals with the problem of the voltage profile optimization in a distribution system including distributed energy resources. Adopting a centralized approach, the voltage optimization is a non-linear programming problem with large number of variables requiring a continuous remote monitoring and data transmission from/to loads and distributed energy resources. In this study, a recently-proposed Jacobian-based linear method is used to model the steady-state operation of the distribution network and to divide the network into voltage control zones so as to reformulate the centralized optimization as a quadratic programming of reduced dimension. New clustering methods for the voltage control zone definition are proposed to consider the dependence of the nodal voltages on both active and reactive powers. Zoning methodologies are firstly tested on a 24-nodes low voltage network and, then, applied to the voltage optimization problem with the aim of analyzing the impact of the R/X ratios on the zone evaluation and on the voltage optimization solution.Energies 2019, 12, 390 2 of 28 without requiring any information exchange. The result is a globally non-optimal control solution. Undoubtedly, this is the lowest-cost solution to start involving DERs in the voltage control of existing distribution networks. Unfortunately, the absence of coordination may introduce technical problems related to the interaction among controllers or even system instability [3,4].In a centralized control, a central control unit, located at the substation level, firstly solves a system voltage optimization/control problem by receiving measurements from all the nodes of the network; then, it sends the optimal set-points back to the local controller of both DERs and conventional Volt/Var devices. This approach yields the optimal solution but its implementation is very expensive requiring a large communication infrastructure with adequate bandwidth to exchange information quickly and accurately [5][6][7][8].In a distributed control, the controllers of both DERs and conventional Volt/Var devices use measurements at PCC to achieve local voltage regulation as in a local control but they also exchange information with the controllers of the neighboring nodes. This approach aims at overcoming the technical problems of the local control while limiting the investments for the communication infrastructure [9,10].In a decentralized approach, the distribution system is usually partitioned into voltage control zones (VCZs). Each VCZ contains nodes weakly coupled with the nodes belonging to other VCZs from an electrical point of view; in the 'electric center' of a VCZ is placed the pilot node (PN), whose voltage variation best represents the variation of the voltage in the VCZ. In each VCZ a centralized control is present whereas the coordination is obtained by a distributed control among the PNs. This approach guarantees the optimal solution for each VCZ and it requires a communication infrastructure lighter than the centralized control [11,12].The div...

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Section: Zoning Methodologiesmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources

2019

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“…The control strategy can help both utilities and PV owners for PV integration. Y. Chai et al provided a double-layer voltage control strategy based on the distribution network partition [21]. It combined the cluster autonomous optimization and distributed inter-cluster coordination optimization in different time scales.…”

Section: E Distribution System and Microgrid Operationmentioning

confidence: 99%

Guest Editorial for the Special Section on Enabling Very High Penetration Renewable Energy Integration Into Future Power Systems

Chen

Zhang

et al. 2018

IEEE Trans. Power Syst.

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Hierarchical distributed voltage control for active distribution networks with photovoltaic clusters based on distributed model predictive control and alternating direction method of multipliers

Xu,

Liu,

et al. 2023

Engineering Reports

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This article proposes a hierarchical distributed voltage control (HDVC) scheme for active distribution networks (ADNs) with high penetration of photovoltaics based on distributed model predictive control (DMPC) and alternating direction method of multipliers (ADMM). The reactive power outputs of several photovoltaic clusters (PVCs) and photovoltaic (PV) units within each PVC are optimally coordinated to keep PV terminal voltages and the voltages of all critical buses of ADNs within the feasible range and mitigate voltage fluctuations. In the ADN layer, a distributed reactive power control scheme based on DMPC is designed for the PVC, which regulates the voltages of all critical buses to be closed to the rated value and mitigates the reactive power variations. In the PVC layer, the reactive power outputs of PV units are optimized based on ADMM to minimize the voltage deviation of each PV terminal and track the reactive power reference from the PVC control. The proposed HDVC scheme requires communication only between neighboring PVC controller, while each PV controller only communicates with the corresponding PVC controller. This regulates the voltages in a completely decentralized manner and effectively reduces the computation burden of the PVC and PV controllers. A modified Finnish distribution network with 10 PVCs was used to validate the control performance of the proposed HDVC scheme.

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Network Partition and Voltage Coordination Control for Distribution Networks With High Penetration of Distributed PV Units

Cited by 169 publications

References 23 publications

Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources

Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources

Guest Editorial for the Special Section on Enabling Very High Penetration Renewable Energy Integration Into Future Power Systems

Hierarchical distributed voltage control for active distribution networks with photovoltaic clusters based on distributed model predictive control and alternating direction method of multipliers

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