A simplified configuration and implementation of a standalone microgrid

A standalone microgrid system consisting of a solar photovoltaic (SPV) array, diesel engine driven permanent magnet synchronous generator (PMSG) and a battery energy storage system (BESS) is analyzed with a composite observer (CO) based control methodology. The PV array fed boost converter is controlled for providing the maximum power of the SPV array at any given temperature and insolation level. The BESS and diesel generator (DG) are used to control the transfer of power in the system. The CO based control technique is used for estimation of active and reactive powers of the standalone system. A three-leg voltage source converter (VSC) with a BESS is used to provide load balancing, reactive power compensation, harmonics elimination capabilities under different loading conditions. The assessment of the proposed configuration is carried out under different conditions and it is validated experimentally on a developed prototype of the system.