Distributed Strategy for Optimal Dispatch of Unbalanced Three-Phase Islanded Microgrids

Pedro Pablo Vergara Barrios*, Juan Manuel Rey-López, Hamid Reza Shaker, Josep M. Guerrero, Bo Nørregaard Jørgensen, Luiz Carlos Pereira da Silva

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents a distributed strategy for the optimal dispatch of islanded microgrids, modeled as unbalanced three-phase electrical distribution systems (EDS). To set the dispatch of the distributed generation (DG) units, an optimal generation problem is stated and solved distributively based on primal-dual constrained decomposition and a first-order consensus protocol, where units can communicate only with their neighbors. Thus, convergence is guaranteed under the common convexity assumptions. The islanded microgrid operates with the standard hierarchical control scheme, where two control modes are considered for the DG units: a voltage control mode (VCM), with an active droop control loop, and a power control mode (PCM), which allows setting the output power in advance. To assess the effectiveness and flexibility of the proposed approach, simulations were performed in a 25-bus unbalanced three-phase microgrid. According to the obtained results, the proposed strategy achieves a lower cost solution when compared with a centralized approach based on a static droop framework, with a considerable reduction on the communication system complexity. Additionally, it corrects the mismatch between generation and consumption even during the execution of the optimization process, responding to changes in the load consumption, renewable generation and unexpected faults in units.
Original languageEnglish
JournalI E E E Transactions on Smart Grid
Volume10
Issue number3
Pages (from-to)3210-3225
ISSN1949-3053
DOIs
Publication statusPublished - May 2019

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Distributed power generation
Power control
Voltage control
Communication systems
Decomposition
Costs

Keywords

  • Consensus algorithm
  • distributed dispatch
  • nonlinear programming
  • optimal power flow
  • three-phase microgrid

Cite this

Vergara Barrios, Pedro Pablo ; Rey-López, Juan Manuel ; Shaker, Hamid Reza ; Guerrero, Josep M. ; Jørgensen, Bo Nørregaard ; da Silva, Luiz Carlos Pereira . / Distributed Strategy for Optimal Dispatch of Unbalanced Three-Phase Islanded Microgrids. In: I E E E Transactions on Smart Grid. 2019 ; Vol. 10, No. 3. pp. 3210-3225.
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abstract = "This paper presents a distributed strategy for the optimal dispatch of islanded microgrids, modeled as unbalanced three-phase electrical distribution systems (EDS). To set the dispatch of the distributed generation (DG) units, an optimal generation problem is stated and solved distributively based on primal-dual constrained decomposition and a first-order consensus protocol, where units can communicate only with their neighbors. Thus, convergence is guaranteed under the common convexity assumptions. The islanded microgrid operates with the standard hierarchical control scheme, where two control modes are considered for the DG units: a voltage control mode (VCM), with an active droop control loop, and a power control mode (PCM), which allows setting the output power in advance. To assess the effectiveness and flexibility of the proposed approach, simulations were performed in a 25-bus unbalanced three-phase microgrid. According to the obtained results, the proposed strategy achieves a lower cost solution when compared with a centralized approach based on a static droop framework, with a considerable reduction on the communication system complexity. Additionally, it corrects the mismatch between generation and consumption even during the execution of the optimization process, responding to changes in the load consumption, renewable generation and unexpected faults in units.",
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Distributed Strategy for Optimal Dispatch of Unbalanced Three-Phase Islanded Microgrids. / Vergara Barrios, Pedro Pablo ; Rey-López, Juan Manuel; Shaker, Hamid Reza; Guerrero, Josep M.; Jørgensen, Bo Nørregaard; da Silva, Luiz Carlos Pereira .

In: I E E E Transactions on Smart Grid, Vol. 10, No. 3, 05.2019, p. 3210-3225.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Distributed Strategy for Optimal Dispatch of Unbalanced Three-Phase Islanded Microgrids

AU - Vergara Barrios, Pedro Pablo

AU - Rey-López, Juan Manuel

AU - Shaker, Hamid Reza

AU - Guerrero, Josep M.

AU - Jørgensen, Bo Nørregaard

AU - da Silva, Luiz Carlos Pereira

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N2 - This paper presents a distributed strategy for the optimal dispatch of islanded microgrids, modeled as unbalanced three-phase electrical distribution systems (EDS). To set the dispatch of the distributed generation (DG) units, an optimal generation problem is stated and solved distributively based on primal-dual constrained decomposition and a first-order consensus protocol, where units can communicate only with their neighbors. Thus, convergence is guaranteed under the common convexity assumptions. The islanded microgrid operates with the standard hierarchical control scheme, where two control modes are considered for the DG units: a voltage control mode (VCM), with an active droop control loop, and a power control mode (PCM), which allows setting the output power in advance. To assess the effectiveness and flexibility of the proposed approach, simulations were performed in a 25-bus unbalanced three-phase microgrid. According to the obtained results, the proposed strategy achieves a lower cost solution when compared with a centralized approach based on a static droop framework, with a considerable reduction on the communication system complexity. Additionally, it corrects the mismatch between generation and consumption even during the execution of the optimization process, responding to changes in the load consumption, renewable generation and unexpected faults in units.

AB - This paper presents a distributed strategy for the optimal dispatch of islanded microgrids, modeled as unbalanced three-phase electrical distribution systems (EDS). To set the dispatch of the distributed generation (DG) units, an optimal generation problem is stated and solved distributively based on primal-dual constrained decomposition and a first-order consensus protocol, where units can communicate only with their neighbors. Thus, convergence is guaranteed under the common convexity assumptions. The islanded microgrid operates with the standard hierarchical control scheme, where two control modes are considered for the DG units: a voltage control mode (VCM), with an active droop control loop, and a power control mode (PCM), which allows setting the output power in advance. To assess the effectiveness and flexibility of the proposed approach, simulations were performed in a 25-bus unbalanced three-phase microgrid. According to the obtained results, the proposed strategy achieves a lower cost solution when compared with a centralized approach based on a static droop framework, with a considerable reduction on the communication system complexity. Additionally, it corrects the mismatch between generation and consumption even during the execution of the optimization process, responding to changes in the load consumption, renewable generation and unexpected faults in units.

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