Energy Management of Hybrid DC Microgrid with Different Levels of DC Bus Voltage for Various Load Types

Mahmoud F. Elmorshedy (), Umashankar Subramaniam (), Jagabar Sathik Mohamed Ali and Dhafer Almakhles
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Mahmoud F. Elmorshedy: Renewable Energy Lab., College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia
Umashankar Subramaniam: Renewable Energy Lab., College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia
Jagabar Sathik Mohamed Ali: Renewable Energy Lab., College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia
Dhafer Almakhles: Renewable Energy Lab., College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia

Energies, 2023, vol. 16, issue 14, 1-32

Abstract: This article suggests a hybrid DC microgrid (HDCMG) with different levels of DC bus voltages to use for various types of loads. The available sources in the HDCMG are wind generating systems (WGSs), photovoltaic (PV) systems, battery banks, and the AC grid for emergencies. The various levels of the DC bus voltages are 760 V, 380 V, and 48 V for different application uses such as electric vehicles and home applications. In addition, the controller plays an important role in the proposed system to achieve the desired DC bus voltage levels and extract the maximum power point (MPP) from the WGS and PV systems. In order to check the power continuity for the critical loads and improve the overall system performance, a suggested energy management strategy (SEMS) is developed. The SEMS is based on the optimum generated power and the state-of-charge (SOC) of the battery banks. Further, the SEMS is developed as a way to prevent battery storage from overcharging and deep discharging. The mathematical relations of the proposed HDCMG and MPP tracking are described. The bidirectional 3-Φ inverter connects the 760 V bus voltage to the AC grid for regulating this DC bus by absorbing the excess power or supplying the required power during the shortage in the generation and the low SOC of the battery storage. Buck converters with controlled duty cycles rather than constant duty cycles are used to obtain 380 V and 48 V from 760 V to achieve better dynamic responses. The overall HDCMG is evaluated using the MATLAB/Simulink package under different working cases to verify the capability of the control system and the PEMS. The obtained results are discussed and show the good performance and the capability of the overall system under the different scenarios, including (i) a comparison between variable duty and constant duty; (ii) high/low generated power and the SOC of the battery in the acceptable region; (iii) high/low generated power and the SOC of the battery in the critical region; and (iv) high/low generated power and the SOC of the battery in the overcharging region.

Keywords: renewable energy resources; DC microgrid; standalone system; grid-connected system; coordinated control; energy management strategy (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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