Efficiency Optimization of a Variable Bus Voltage DC Microgrid

David García Elvira, Hugo Valderrama Blaví, Àngel Cid Pastor and Luis Martínez Salamero
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David García Elvira: Department of Electrical, Electronic, and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain
Hugo Valderrama Blaví: Department of Electrical, Electronic, and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain
Àngel Cid Pastor: Department of Electrical, Electronic, and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain
Luis Martínez Salamero: Department of Electrical, Electronic, and Automatic Control Engineering, Universitat Rovira i Virgili, 43007 Tarragona, Spain

Energies, 2018, vol. 11, issue 11, 1-21

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.

Keywords: DC micro grid; efficiency optimization; variable bus voltage MG; variable switching frequency DC-DC converters; centralized vs. decentralized control; local vs. global optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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