Abstract
This paper aims to provide a complete power management strategy for an isolated microgrid (MG) for remote areas and improve the power quality of the microgrid when local loads draw unbalanced nonlinear currents from the MG. The MG under consideration consists of a synchronous reluctance generator (SyRG) based diesel generator (DG) set, a dual stage photovoltaic (PV) array, and a battery energy storage (BES). Since the DG impedance is more than the grid, the DG currents and voltages are subjected to more distortion in the presence of nonlinear loads and single phase loads. To solve these power quality problems, an improved cascaded complex coefficient filter (CCCF) based algorithm is used during the DG operation. The power management scheme ensures minimum use of the DG set for power generation and aims for maximum power extraction from the PV array as much as possible. The PV array is operated by a modified de-rated perturb and observe (MDP&O) MPPT. The DG set is operated in its fuel economic zone (FEZ). The synchronization control ensures fast transition of the system between DG connected mode, and standalone mode (SAM) such that the power is fed to the load continuously. The system simulink model is developed, and the performance is analyzed under various dynamic conditions.
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