ICBAF-DSOGI Based Intelligent Control Strategy for Utility Interfaced SPV-BES-VSC System

This paper presents an autonomous three-phase, utility interfaced, Solar Photo Voltaic-Battery Energy Storage-Voltage Source Converter (SPV-BES-VSC) system using Instantaneous Characteristic based Adaptive Filter (ICBAF) control strategy in combination with Dual Second Order Generalised Integrator (DSOGI). The control algorithm operates the Voltage Source Converter (VSC) in a manner that the load power demand (active and reactive) as a priority option is supplied by SPV-BES-VSC combination and the balance power (surplus/deficit) is injected to/drawn from, the AC grid as an active power. The PV Feed-Forward (PVFF) signal plays a dominant role in improving the SPV-BES-VSC system dynamics whenever the insolation level changes due to environmental conditions. DSOGI is used in the control strategy for generation of template for the reference grid currents. The SPV-BES-VSC system is realised in MATLAB environment in Discrete Time Frame (DTF) using Simulink and Sim Power System (SPS) toolboxes, under various operating conditions. The Bi-directional DC/DC converter and VSC are operated at a switching frequency of 10kHz each. The Total Harmonic Distortion (THD) of grid current and Point of Common Coupling (PCC) voltage are observed within range of 5% in accordance to IEEE-519 and IEEE-929 standards, respectively.