A backstepping control strategy applied to the connected hybrid renewable energy system operated in MPPT

In this paper, an interconnected grid hybrid renewable energy system, HRES, (wind/PV) is studied. The wind energy conversion system, WECS, is constructed aroud a wind turbine coupled to a double fed induction generator, DFIG. The stator of DFIG is directly connected to the grid and the rotor is connected to the grid through back-to-back power converters. To control the wind system, we have applied the adaptive backstepping control strategy for both converters. The PV energy system is composed by PV cell energy and the DC-DC boost converter. To control the DC-DC boost converter, we have applied tow cascade PI control loop. The first one is used to regulate the output current or the second one is used to control the output voltage. We have considered in both control structure the MPPT algorithm. To study the comportment of the HRES against the environment changes, we have considered some simulations scenarios for the wind speed, the irradiance and the temperature. We have studied the dynamic performances of the proposed control strategy.