Power Management With ICCCF-EFLL and MPMR Control for a SPVA-BES-SRDG RECS With Minimum DG Usage and Re-Closure Attempts

The islanded renewable energy conversion systems (RECSs) primarily involve solar photovoltaic array (SPVA) with a battery energy storage (BES). Despite diesel generator (DG) sets are installed for system reliability, their usage should be limited to minimize the operating cost. Moreover, the load irregularities reflect as poor power quality and unbalanced DG currents, which increase the harmonics and mechanical losses. To address these challenges, this paper presents the control and advanced power management for a synchronous reluctance generator type diesel set (SRDG) interfaced SPVA-BES based islanded RECS. It operates with and without SRDG as decided by an advanced power management controller (APMC). It is controlled by an improved cascaded complex coefficient filter (ICCCF) with enhanced frequency locked loop (EFLL) based control to improve the power quality of RECS. The control attenuates the DC offsets, extracts fundamental components and makes them balanced and linear during sustained load current irregularities. The modified proportional multi-resonant controller (MPMR) linearizes the point of interconnection (POI) voltages in absence of SRDG. The APMC ensures that the usage of SRDG is minimized and reduces the number of synchronization attempts with RECS. Moreover, during synchronization, control ensures that the chances of failed synchronization/false tripping of SRDG is minimized. Performance of RECS with proposed control is demonstrated using embedded and experimental results.