DTLMMS Based Current Control for Three-Phase Single-Stage SPV-Battery Sourced Microgrid with CCROGI-FLL Enabled Synchronization

This work illustrates the coordinated control and synchronization operation of 1-stage solar photovoltaic (SPV)battery supported microgrid. The robust diffusion total least mean M-estimate square (DTLMMS) algorithm is employed for extraction of fundamental load current component in gridinterfaced mode. The adaptive algorithm is found to be superiorly robust for impulse noise conditions when calculating error-in-variable (EIV). Synchronization process is facilitated by complex coefficient reduced order generalized integrator (CCROGI) frequency locked loop (FLL) along with phase correction to reduce the synchronization time. CCROGI-FLL is found to have fast dynamic response with a much lower overshoot. The transient response has a better compromise between speed and damping. In standalone mode, CCROGIFLL is also utilized for local frequency generation. The transient and steady-state responses are found to be satisfactory with total harmonics distortion (THD) of the grid fed current being less than 5%.