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Energies 2018, 11(11), 3090; https://doi.org/10.3390/en11113090

Efficiency Optimization of a Variable Bus Voltage DC Microgrid

Department of Electrical, Electronic, and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain
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Received: 28 September 2018 / Revised: 30 October 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Control and Nonlinear Dynamics on Energy Conversion Systems)
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Abstract

A variable bus voltage DC microgrid (MG) is simulated in Simulink for optimization purposes. It is initially controlled with a Voltage Event Control (VEC) algorithm supplemented with a State of Charge Event Control (SOCEC) algorithm. This control determines the power generated/consumed by each element of the MG based on bus voltage and battery State of Charge (SOC) values. Two supplementary strategies are proposed and evaluated to improve the DC-DC converters’ efficiency. First, bus voltage optimization control: a centralized Energy Management System (EMS) manages the battery power in order to make the bus voltage follow the optimal voltage reference. Second, online optimization of switching frequency: local drivers operate each converter at its optimal switching frequency. The two proposed optimization strategies have been verified in the simulations. View Full-Text
Keywords: DC micro grid; efficiency optimization; variable bus voltage MG; variable switching frequency DC-DC converters; centralized vs. decentralized control; local vs. global optimization DC micro grid; efficiency optimization; variable bus voltage MG; variable switching frequency DC-DC converters; centralized vs. decentralized control; local vs. global optimization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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García Elvira, D.; Valderrama Blaví, H.; Cid Pastor, À.; Martínez Salamero, L. Efficiency Optimization of a Variable Bus Voltage DC Microgrid. Energies 2018, 11, 3090.

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