Performance Assessment of PV-SH-BES System With Mode Transfer Capabilities

Synchronization of AC sources is a challenging task due to the variation in voltage, frequency and jump in phase angle at the instant of mode transfer. Conventional SRF-PLL (Synchronous Reference Frame-Phase Locked Loop) fails to extract the frequency and phase at unbalanced and distorted voltages conditions. Therefore, a frequency adaptive filter (FAF) is used to estimate the phase angles of the voltages of the grid and the hydro generator, which are harmonics-free. The microgrid is found capable of driving in both islanded mode and grid connected mode. Moreover, this work also utilizes a block sparse normalized proportionate least mean M estimate based (BS-NPLME) adaptive filter to extract the fundamental element of the load currents and the hydro generator currents in both the modes to generate the switching pulses. Besides, to improve the reliability of the system, a battery energy storage (BES) is integrated to the microgrid (MG) along with solar PV panel to harness the solar energy. An increment conductance (InC) maximum power point algorithm (MPPA) is used to extract the peak power. Furthermore, the ancillary functions delivered by the power conditioning unit, are achieved as suppression of harmonics and power factor correction of the grid. The reactive power is compensated by power conditioning unit (PCU). This system is simulated in MATLAB platform and obtained results are presented to demonstrate these functions of MG.