Grid-Connection Control Strategy for Synchronous Wind Generator Based on Physical Model Experimental System

This paper investigates the key challenges in the field testing of traditional wind power grid-connection systems. A Physical Model Experimental System (PMES) based on a synchronous wind generator is proposed to simulate the behavior of wind turbines. The system employs a hybrid topology integrating uncontrolled rectification and controlled inversion, which is characterized by its simple structure and strong replicability. To address the DC bus voltage fluctuations caused by AC input variations under the uncontrolled rectification grid-connection mode, an enhanced grid-voltage-oriented vector control strategy combined with fuzzy PID-based inverter grid-connection control is developed. This method ensures the stability of the DC bus voltage and precise regulation of the power factor on the AC side. Simulink simulations show that the proposed grid-connection control strategy significantly improves dynamic response, enhances the accuracy of DC voltage regulation, reduces AC-side current harmonics, and provides high-quality grid-connected power.