Development of a power plant controller (PPC) for large-scale renewable energy farms utilizing Siemens S7-1500 PLC. This project focuses on designing and implementing a robust control system that complies with GPS (Grid Performance Standards) for generators, ensuring adherence to frequency response, voltage regulation, actibe and reactive power support requirements. The system effectively manages the output of inverter generators, maintaining stable operation and efficient power regulation through advanced droop control,LVRT function ,active and reactive power management strategies.