ENHANCED MPPT CONTROL OF A TWO-STAGE GRID-CONNECTED PV SYSTEM UNDER FASTCHANGING IRRADIANCE CONDITIONS

摘要

In this paper, an enhanced Maximum Power Point Tracking (MPPT) strategy for a two-stage gridconnectedPV system is proposed, which enables accurate tracking of the maximum power point irrespective of therate of change in solar irradiance levels. The analysis is performed both in the frequency and time domains, using asuitable linearized model of the system. A comparative assessment of the proposed MPPT strategy versus aconventional Perturbation and Observation (P&O) method is carried out for operation under trapezoidal irradianceprofiles.