Hybrid microgrid system for wind power electrical generation

A hybrid microgrid system (HMS) for wind power electrical generation comprising:

• a wind turbine (WT) and an electric generator;
• 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 WT and the electric generator and to supply a power to the GSC;
• a rechargeable battery configured to exchange a power between 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 comprising:
• a processor;
• a memory;
• a bus-line;
• and I/O port,
• wherein, the controller is configured to control the HMS by executing a program installed in the memory and in accordance with a global sliding mode control with fractional order terms (GSMCFO) method, and 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 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 (i of the characteristic element ci, and a control law element uicnt of the characteristic element ci, and
• wherein the controller is further configured to
• monitor the characteristic element ci(t) and a related status of the HMS,
• calculate at least one of the equations defined in the definition set based on the characteristic element ci(t) monitored and the status of the HMS monitored, and
• control the HMS based on the control law element uicnt(t) calculated,
• wherein the equation defining the FOSM surface ζi(t) for 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), wherein the tracking error ei (t) for the characteristic element ci(t) is defined as,
• ei(t)=ci(t)−ci*(t),
• wherein the equation defining the control law element uicnt(t) is configured to satisfy a condition
• ζ
• i
• (
• t
• )
• ⁢
• d
• ⁢
• ζ
• i
• (
• t
• )
• dt
• <
• 0
• ,
• so far as ζi(t) is not zero.