Hybrid diesel/MCT/battery electricity power supply system for power management in small islanded sites: Case study for the ouessant French Island

Abstract

In this chapter, a hybrid Diesel/MCT/Battery system for power supply and power management on a small island is studied. The power variation of marine current turbine (MCT) related to the tidal phenomenon is considered. A semidiurnal tide causes the seawater to rise and fall with a period about 12 h, thus resulting large variations of the MCT output power on a daily basis. On the other hand, the electricity demand from the grid side (or load side) has its own pattern during each day. Large differences between the power produced from the renewable sources and the power demanded from the grid/load side could cause power unbalance problem. This chapter proposes using Vanadium Redox flow Battery (VRB) energy storage system to manage the total available power of the hybrid MCT/battery/diesel system and to follow the grid/load demand on a daily basis. The MCT-dominated power supply case and the case when diesel generators as the main supply source are investigated, respectively. The battery modeling and control with appropriate activating rules of the diesel generator are presented in this chapter. At the end of this chapter, some insights for future MCT farm operation for hybrid island power supply will be discussed.