Voltage regulation methods for active distribution networks considering the reactive power optimization of substations

•A new centralized-decentralized voltage regulation method is proposed.•The distribution network contains high penetrations of photovoltaic power systems.•The optimization of substations is considered while regulating voltage variations.•A pre-decision scheme is proposed to reduce adjustments of vol...

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Vydáno v:Applied energy Ročník 284; s. 116347
Hlavní autoři: Ma, Wei, Wang, Wei, Chen, Zhe, Wu, Xuezhi, Hu, Ruonan, Tang, Fen, Zhang, Weige
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 15.02.2021
Témata:
Active distribution network
algorithms
capacitors
decision making
electric potential difference
Multi-objective mixed integer nonlinear programming
Non-dominated sorting genetic algorithm II
Photovoltaic power fluctuations
solar energy
solar farms
Voltage regulation
Voltage variations
Voltage variations
Photovoltaic power fluctuations
Active distribution network
Non-dominated sorting genetic algorithm II
Voltage regulation
Multi-objective mixed integer nonlinear programming
ISSN:0306-2619, 1872-9118
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Shrnutí:•A new centralized-decentralized voltage regulation method is proposed.•The distribution network contains high penetrations of photovoltaic power systems.•The optimization of substations is considered while regulating voltage variations.•A pre-decision scheme is proposed to reduce adjustments of voltage control devices.•A practical decision-making method is proposed to determine the best solution. Due to the increasing penetration of photovoltaic (PV) power systems in active distribution networks (ADNs), PV power fluctuations may result in significant voltage variations of ADNs. Therefore, this paper proposes a voltage regulation method for ADNs to minimize the operational losses while keeping the nodal voltages within the limit with the reduced PV power curtailment and the reduced switching numbers of on-load tap changers (OLTCs) and capacitor banks (CBs). Meanwhile, the proposed voltage regulation method also aims to minimize the reactive power flowing through OLTCs, and to minimize the switching numbers of substation CBs. In this study, the centralized voltage regulation is performed based on the worst voltage variation scenarios of ADNs, where a multi-objective mixed integer nonlinear programming (MINP) model with time-varying decision variables is established. The MINP model is solved using the non-dominated sorting genetic algorithm II (NSGA-II), and a practical decision-making algorithm is developed to select the best solution from the Pareto optimal set. Moreover, the decentralized voltage regulation aims at mitigating real-time nodal voltage variations via adjusting the real-time active and reactive power of each PV plant. Several simulations and comparisons are carried out on a modified IEEE 33-node system to verify the effectiveness of the proposed methods, and to compare with some previous voltage regulation methods. Simulation results show that the proposed voltage regulation methods can not only effectively control voltage variations of ADNs but also improve the economics of ADNs, substations, and PV plants.
Bibliografie:ObjectType-Article-1
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ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2020.116347