Faster-than-real-time Simulation of Stator-rotor Decoupling Digital Twin of Doubly-fed Induction Generator Based on FPGA

To achieve the large-scale real-time simulation of doubly fed wind generator (DFIG), we designed a DFIG digital image intelligent property (IP) core based on field programmable gate array (FPGA), and proposed a virtual capacitance equivalent method for decoupling the “T-shaped” equivalent circuit of the stator and rotor of the asynchronous machine. Based on this, a parallel algorithm for each component in DFIG was proposed. Finally, DFIG-IP was constructed. Through pipeline optimization design, we performed the experimental verification of the calculation accuracy and speed of DFIG-IP based on FPGA under four working conditions. The research results show that the proposed method can be employed to reduce the FPGA resource required by DFIG asynchronous machine solution module about 77%. The DFIG-IP designed based on FPGA can achieve a faster-than-real-time acceleration ratio of 27.8 at 500 MHz clock frequency, and a single DFIG-IP can occupy no more than 20% of ZCU106 resources. The method proposed can meet the requirements of DFIG grid connected system real-time simulation in accuracy and speed. The research in this paper can provide a reference for accelerating the research of electromagnetic transient simulation of grid connected systems with a large number of new energy sources. © 2023 Science Press. All rights reserved.