Inverter Control Scheme Based on Fuzzy Logic System with Tracking Differentiator for Wind Power Grid Integration

Wind energy conversion systems (WECSs) is a complex system with multi-variables, strong coupling, non-linearity, and variable parameters, following traditional control schemes are inadequate in answering the output-performance demands. According to DC bus voltage fluctuation under the condition of grid voltage imbalance, the scheme based on fuzzy logic system with tracking differentiator is proposed for WECSs based on a permanent magnet synchronous generator (PMSG). In this scheme, the tracking differentiator (TD) is used to extract the differential signal reasonably. Then, the extracted differential signal is combined with the fuzzy logic system in the voltage outer loop, so as to suppress the DC bus voltage fluctuation. In addition, a digital simulation platform was developed to emulate the wind power system based on PMSG. Finally, the control performance of the proposed strategy was tested on the digital simulation platform to verify its correctness, effectiveness and reliability.