Improved LVRT control in grid tied hybrid renewable energy system with optimized high gain converter

Abstract

This research introduces advanced Low Voltage Ride through (LVRT) control strategies designed to enhance the resilience and stability of grid-connected wind and solar power generation systems. This LVRT control method is intended to efficiently infuse reactive power into grid according to grid code rules, using a Voltage Source Inverter (VSI). The proposed approach employs a LVRT method that determines the injection quantities of reactive and active currents. The strategy's adaptability is contingent upon the dropping ratio grid voltage, ensuring a dynamic response to varying grid conditions. For solar power production systems, the Photovoltaic (PV) voltage is augmented through the implementation of a Modified High Gain Boost Converter. This converter is equipped with a Chaotic Pigeon Optimized Proportional-Integral (CPO-PI) controller, providing an innovative solution for enhancing voltage levels in PV systems. The chaotic pigeon optimization aids in fine-tuning the PI controller, optimizing its performance for varying operational conditions. In the case of wind power generation systems, the control of Doubly-Fed Induction Generator (DFIG) based Wind Energy Conversion Systems (WECS) is achieved through a conventional PI controller. The entire work is simulated using Matlab Simulink platform and the attained outcomes prove that the developed work has highest conversion efficiency of 97.1 %. The integration of these strategies ensures an improved response to grid disturbances and voltage fluctuations, ultimately enhancing the overall performance and reliability of grid-connected renewable energy systems.