One-Dimensional Optimization for Proportional-Resonant Controller Design along with fuzzy logic controller Against the Change in Solar Irradiation and Source Impedance in PV Systems

S Kiran, Y Reddy
International Research Journal of Engineering and Technology   unpublished
The changes in solar irradiation and source impedance impact on photovoltaic (PV) system control performance is examined. To acquire steady sinusoidal current tracking control for the grid-tied inverter, an internal-model-based undamped proportional resonant (PR) controller is employed for the PV inverter that would ease the control-loop design and improve the system performance. Proportional Resonant (PR) controller have advantages such as low-cost computational resources and spontaneous
more » ... d spontaneous tracking capability. Despite the advantages of PR controller such as spontaneous tracking capability, the tracking performance may decrease due to sudden changes in solar irradiation and source impedance. So to accustom PR controllers over distinct operating conditions without acquiring redundant tracking error, an ODO algorithm is proposed to search the best χ with minimum steady state error. Therefore, the control gains of PR controller are updated for accommodating the VSI to the changed operating condition. The VSI is modulated using a Pulse Width Modulator according to the changed operating conditions. Fuzzy logic controller and proportional integral controller are used in the DC voltage regulator. FLC generates the required small change for voltage to control the magnitude of the injected voltage. Sinusoidal tracking is even more accurate with the addition of fuzzy controller into the system. The simulation is analyzed and carried out by using SIMULINK/MATLAB software for various values of χ.