**List of Abbreviations**

ASM: asynchronous machine CB: Circuit Breaker DE: Diesel Engine ESS: Energy storage system; BESS: battery ESS SCIG: squirrel cage Induction Generator SM: synchronous machine WDPS operation modes: Diesel Only (DO), Wind Diesel (WD), Wind Only (WO) WT: Wind Turbine

#### **Appendix A. Wind Diesel Power System (WDPS) Parameters**

WDPS rated frequency and voltage = 60 Hz and 440 V Diesel Generator (DG) rated power and inertia constant = 300 kVA and 1.75 s. Wind Turbine Generator (WTG) rated power and inertia constant = 275 kW and 2 s. Dump Load (DL) rated power = 357 kW DL integral control KI = 9 s<sup>−</sup><sup>1</sup> Flywheel Energy Storage System (FESS); LS-FESS: low speed FESS FESS rated power, PS-MOM = 150 kW FESS maximum available energy = 18,000 kJ FESS Direct Current (DC) -link voltage = 800 V FESS capacitor bank capacitance = 4.7 mF FESS inductance (L) filter = 2.5 mH FESS Proportional and Derivative (PD) constants: kP = 151 kW/Hz, KD = 7 kWs/Hz
