ISOGI-Q based control algorithm for single stage grid tied SPV system

This paper deals with a single stage solar photovoltaic (SPV) array tied with a three phase grid by using an improved second order generalized integrator quadrature signal generator (ISOGI-QSG) based control algorithm to improve power quality of the grid. The maximum point power tracking (MPPT) is achieved by using an incremental conductance method. The incremental conductance MPPT method is effective to extract maximum power from a SPV array as well as to regulate the DC link voltage. ISOGI-QSG based control algorithm is robust and enhances the power quality in terms of load balancing, noise elimination and power factor correction (PFC) very effectively. Having D-STATCOM capabilities of SPV based system is useful to supply the active power to grid as well as to loads. The control algorithm is verified on proposed system topology and obtained responses are found satisfactory and total harmonic distortion (THD) of source currents within standard limit.