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Title :Unbalanced Voltage Compensation with Optimal Voltage Controlled Regulators and Load Ratio Control Transformer
Authors :Nakadomari, Akito
Shigenobu, Ryuto
Kato, Takeyoshi
Krishnan, Narayanan
Hemeida, Ashraf Mohamed
Takahashi, Hiroshi
Senjyu, Tomonobu
Issue Date :21-May-2021
Abstract :Penetration of equipment such as photovoltaic power generations (PV), heat pump water heaters (HP), and electric vehicles (EV) introduces voltage unbalance issues in distribution systems. Controlling PV and energy storage system (ESS) outputs or coordinated EV charging are investigated for voltage unbalance compensation. However, some issues exist, such as dependency on installed capacity and fairness among consumers. Therefore, the ideal way to mitigate unbalanced voltages is to use grid-side equipment mainly. This paper proposes a voltage unbalance compensation based on optimal tap operation scheduling of three-phase individual controlled step voltage regulators (3φfSVR) and load ratio control transformer (LRT). In the formulation of the optimization problem, multiple voltage unbalance metrics are comprehensively included. In addition, voltage deviations, network losses, and coordinated tap operations, which are typical issues in distribution systems, are considered. In order to investigate the mutual influence among voltage unbalance and other typical issues, various optimization problems are formulated, and then they are compared by numerical simulations. The results show that the proper operation of 3φSVRs and LRT effectively mitigates voltage unbalance. Furthermore, the results also show that voltage unbalances and other typical issues can be improved simultaneously with appropriate formulations.
URL :https://doi.org/10.3390/en14112997
Type Local :雑誌掲載論文
ISSN :1996-1073
Publisher :MDPI
URI :http://hdl.handle.net/20.500.12000/48785
Citation :Energies Vol.14 no.11
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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