WOA based MPPT of Grid Connected Single Stage PV System with TSKF Controllers
Putchakayala Yanna Reddy, T. Murali Krishna, G. Divya, Krishna Chaithanya Janapati, Arnav Kotiyal, Vikrant Singh, K Saneep, B. Parvatheeswara Rao
Abstract
Grid-connected solar plants have been widely implemented in numerous areas around the world. Recently, grid-connected solar power plants employing photovoltaic (PV) technology have attracted interest owing to improvements in power converter management. Grid connected single stage models can reduce the number of devices needed in solar plants, resulting in cost reductions. Nonetheless, DC circuits are frequently employed in PV systems (PVSs) to enhance performance at the operation of maximum power point (MPP). Inverters are essential for optimizing power extraction from PVSs by employing advanced control methods in power electronic devices. This advancement eliminates the need for additional DC to DC circuits to maintain the PVS at its MPP. This advancement is particularly advantageous for small solar power facilities, given that not all PV arrays are exposed to the same levels of sunlight. In situations where there are abrupt variations in input, Takagi-Sugeno-Kang Fuzzy (TSKF) controllers are favored compared to PI/PID controllers. Consequently, this study has developed a single-stage controller based on TSKF for a 1.0MW grid-connected solar power plant. Distribution systems are generally associated with unbalanced loads, leading to uneven grid currents that may impact additional loads. Therefore, the proposed control method aims to balance currents of grid lines in the presence of uneven local loads. Furthermore, the controller of the inverter is implemented to offset the reactive power utilized by nearby loads. In situations where partial shading occurs, it is crucial to utilize an optimization algorithm to determine the global maximum location (GML) from various local maximum points. Whale optimization method is a well-known strategy that facilitates the swift detection of GML in comparison to alternative algorithms. Comprehensive results have been demonstrated and assessed utilizing the OPAL-RT platform with hardware-in-the-loop for testing a grid integrated system.