Optimized Integration of a Set of Small Renewable Sources Into a Bulk Power System

Electric power systems are increasingly relying on small renewable plants that must be connected to a bulk grid. This paper proposes a strategy to solve the transmission line planning problem for such an integration. The model minimizes the costs of investment and annual energy losses, considering a...

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Bibliographic Details
Published in:IEEE transactions on power systems 2021-01, Vol.36 (1), p.248-260
Main Authors: Santos, Caio dos, Rider, Marcos J., Lyra, Christiano
Format: Article
Language:English
Subjects:
Alternative energy sources
Collector substation allocation
Conductors
Distributed generation
Electric potential
Electric power systems
Integer programming
integration of small renewable sources
Investment
Linear programming
Mixed integer
mixed-integer linear programming
Nonlinear programming
Planning
Power transmission lines
Resource management
Substations
transmission expansion planning
Transmission lines
Voltage
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Summary:Electric power systems are increasingly relying on small renewable plants that must be connected to a bulk grid. This paper proposes a strategy to solve the transmission line planning problem for such an integration. The model minimizes the costs of investment and annual energy losses, considering as planning alternatives the building of transmission lines, the collector substation allocation and the voltage magnitude levels of the transmission line while ensuring the operational constraints of the network and the voltage magnitude at connection points with the bulk power system (BPS). Linearization and approximation techniques are used to obtain an approximate mixed-integer linear programming (MILP) model from the original mixed-integer nonlinear programming model. A search-space reduction procedure is proposed to obtain the most qualified sites to accommodate collector substations. The combined strategy leads to a reduction in the computational effort, which allows full-scale studies of the optimal integration of a set of small renewable sources. For intermittent renewable sources, the proposed approach is used to obtain the Pareto front considering the total planning cost and the annual distributed energy. The results of two scenarios, using a real-world Brazilian case, certify the benefits of the proposals.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2020.3002650