Textbook in PDF format Weak Grid Integration of Inverter-Based Resources delves into current operational challenges and control solutions associated with inverter-based resources (IBR) in weak grid scenarios, with real-world examples included throughout to elucidate key concepts. The book introduces the control architecture of IBR power plants and the underlying AC circuit topology, providing readers with a comprehensive overview of the system. It discusses specific operational challenges and examines how they relate to the grid-following control system and circuit characteristics. The book also reviews various grid-forming control designs and their role in enhancing weak-grid operation, while analyzing potential challenges arising from interactions between IBRs and series or shunt compensation. In addition, it investigates the different fault behaviors associated with grid-following and grid-forming control