US 12,444,953 B2
Robust control for optimized islanded and grid-connected operation of solar/wind/battery hybrid energy systems
Muhammad Khalid, Dhahran (SA); and Muhammad Maaruf, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Mar. 7, 2024, as Appl. No. 18/598,052.
Claims priority of provisional application 63/459,810, filed on Apr. 17, 2023.
Prior Publication US 2024/0348058 A1, Oct. 17, 2024
Int. Cl. H02J 3/46 (2006.01); F03D 9/00 (2016.01); H02J 3/16 (2006.01); H02J 3/32 (2006.01); H02M 3/158 (2006.01)
CPC H02J 3/46 (2013.01) [F03D 9/007 (2013.01); H02J 3/16 (2013.01); H02J 3/32 (2013.01); H02M 3/1582 (2013.01); F05B 2220/708 (2013.01); H02J 2300/26 (2020.01); H02J 2300/28 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method to control a hybrid renewable microgrid system,
wherein the hybrid renewable microgrid system comprises a solar energy generation unit and an energy storage unit in direct connection to a DC bus, a DC-DC buck-boost converter connected to the energy storage unit, a wind energy generation unit coupled to a rotor-side converter, a grid-side converter coupled to the DC bus, and a microgrid load; and
wherein a utility grid comprising a plurality of energy generation sources and one or more utility grid loads is electrically coupled to the hybrid renewable microgrid system;
the method comprising:
performing a maximum power point tracking control for each of the solar energy generation unit and the wind energy generation unit;
receiving a power from the wind energy generation unit utilizing the rotor-side converter and receiving a power from the solar energy generation unit utilizing the grid-side converter;
supplying at least one of (1) a first power to the microgrid load of the hybrid renewable microgrid system in a standalone operation of the hybrid renewable microgrid system and (2) a second power to a combination of the microgrid load of the hybrid renewable microgrid system and the one or more utility grid loads of the utility grid in a grid-connected operation of the hybrid renewable microgrid system;
receiving a third power from the plurality of energy generation sources of the utility grid utilizing the rotor-side converter in the grid-connected operation of the hybrid renewable microgrid system;
performing a sliding mode control for at least one of a transition from the standalone operation to the grid-connected operation and a transition from the grid-connected operation to the standalone operation;
controlling the supply of the second power in the grid-connected operation by integrating the wind energy generation unit into the utility grid through the rotor-side converter and the grid-side converter;
regulating a microgrid load voltage of the microgrid load in the grid-connected operation of receiving the third power using a charging and/or discharging of the energy storage unit;
controlling the charging and/or discharging of the energy storage unit using the DC-DC buck-boost converter in the standalone operation and the grid-connected operation of the hybrid renewable microgrid system; and
regulating the microgrid load voltage through performing the maximum power point tracking control, the sliding mode control, and the charging and discharging of the energy storage unit in the standalone operation and the grid-connected operation of the hybrid renewable microgrid system.