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Efficient Unbalanced Three-Phase Network Modelling for Optimal PV Inverter Control

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  • Chi-Thang Phan-Tan

    (Department of Electrical and Electronic, Cork Institute of Technology, Bishopstown, T12 P928 Cork, Ireland)

  • Martin Hill

    (Department of Electrical and Electronic, Cork Institute of Technology, Bishopstown, T12 P928 Cork, Ireland)

Abstract

High penetration levels of renewable energy generation in the distribution network require voltage regulation to avoid excessive voltage at generating nodes. To effectively control the network and optimize network hosting capacity, the distribution system operator must have an efficient model for power flow analysis. This paper presents the formulas and steps to express the power flow analysis equations of an unbalanced 3-phase network in matrix form suited to programmed solutions. A benchmark MATLAB/Simulink network with unbalanced distribution lines, photovoltaic inverters, and loads is built to verify the matrix model. To demonstrate the application of the model, the control of reverse energy flow from the photovoltaic inverters to keep the voltage in the network below the regulated level is simulated. Two decentralized control algorithms are applied in the network, including an on/off and a multi-objective constrained optimization controller. The detailed construction of the optimization problem for the 3-phase network in matrix form, which is consistent with the power flow calculation, is described. Simulation with the control methods over a day shows that the total active power of the on/off and optimized controllers deliver 41.92% and 99.39% of the available solar power, respectively, while maintaining the network node voltages within limits.

Suggested Citation

  • Chi-Thang Phan-Tan & Martin Hill, 2020. "Efficient Unbalanced Three-Phase Network Modelling for Optimal PV Inverter Control," Energies, MDPI, vol. 13(11), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:3011-:d:370250
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    References listed on IDEAS

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    1. Baljinnyam Sereeter & Kees Vuik & Cees Witteveen, 2017. "Newton Power Flow Methods for Unbalanced Three-Phase Distribution Networks," Energies, MDPI, vol. 10(10), pages 1-20, October.
    2. Samadi, Afshin & Shayesteh, Ebrahim & Eriksson, Robert & Rawn, Barry & Söder, Lennart, 2014. "Multi-objective coordinated droop-based voltage regulation in distribution grids with PV systems," Renewable Energy, Elsevier, vol. 71(C), pages 315-323.
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    Cited by:

    1. Zekun Sun & Hao Liu & Yueming Ding & Haopeng Luo & Ting Liu & Qinyue Tan, 2022. "Collaborative Control Strategy of Power Quality Based on Residual Capacity of Photovoltaic Inverter," Energies, MDPI, vol. 15(21), pages 1-16, October.

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