US 12,003,111 B1
System and method for controlling a hybrid microgrid system
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 Oct. 27, 2022, as Appl. No. 17/975,120.
Int. Cl. H02J 3/38 (2006.01); H02J 3/32 (2006.01); H02M 3/158 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 3/32 (2013.01); H02M 3/1582 (2013.01); H02J 2300/24 (2020.01); H02J 2300/28 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling a hybrid microgrid system (HMS), the HMS comprising: a renewable energy source; a grid side converter (GSC) configured to output a power to a point of common coupling (PCC); a DC-link configured to receive a power from the renewable energy source and to supply a power to the GSC; a rechargeable battery configured to exchange a power via the DC-link; a load configured to receive a power via the PCC; a utility grid configured to exchange power via the PCC; and a controller configured to control the HMS by executing a program and in accordance with a global sliding mode control with fractional order terms (GSMCFO) method, wherein the program comprises a definition set customized for the HMS and to be referred in applying the GSMCFO method to the HMS, wherein the method comprises:
preparing the definition set,
wherein the definition set comprises a characteristic element ci to be measured; and equations defining a desired value ci* of the characteristic element ci, a fractional order sliding mode (FOSM) surface ζi for the characteristic element ci, and a control law element uicnt of the characteristic element ci;
monitoring the characteristic element ci(t) and a related status of the HMS;
calculating at least one of the equations based on the characteristic element ci(t) monitored and the related status of the HMS monitored; and
controlling the HMS based on the control law element uicnt(t) calculated and in accordance with the GSMCFO method,
wherein, the equation defining the FOSM surface ζi(t) of the characteristic element ci(t) comprises a fractional time integral of a tracking error ei(t) and a fractional time derivative of the tracking error ei(t) defined as,
ei(t)=ci(t)−ci*(t),  (1)
and wherein the equation defining the control law element uicnt(t) is configured to satisfy a condition,

OG Complex Work Unit Math
so far as ζi(t) is not zero.