Improving the Resiliency of a PV Standalone System Under Variable Solar Radiation and Load Profile

The standalone PV system is controlled using the maximum power point tracking (MPPT) algorithm under the impact of the fixed or changing solar irradiation, and the system is interconnected to battery energy storage (BES) to produce power for variable AC loads. The system comprises of PV array, a battery, (DC/DC) boost converter circuit, single phase inverter with LCL filter, and bidirectional (DC/DC) buck-boost converter perform as charging circuit. The maximum power point (MPP) be able to obtained by controlling the duty cycle fed to the gate of the IGBT transistor located within the boost circuit. Moreover, the control method used with both the single-phase inverter and the buck-boost converter circuit is a dynamic error driven PI controller. This paper studies the performance comparison of PV standalone system in two cases of operation. In the first case, the system operates without and with battery under constant solar irradiation. In the second case, the PV system is interconnect to a battery and operates under a variable in solar radiation. In addition to presenting the operating results of the system for the two cases mentioned previously, harmonic analysis is performed on these results using FFT tools. The research paper works on presenting the operating results of the system in the above-mentioned cases and clarifies the following points: loads management, stable load voltage level, harmonic analysis through FFT tools, charging and discharging the BES and transient overshoot.