Real-time Parallel Multi-rate Electromagnetic Transient Simulation Method for Converters Based on Field Programmable Gate Array

Abstract

As an increasing number of power electronic devices are integrated into modern power systems, the demand for real-time electromagnetic transient simulation with microsecond simulation steps keeps increasing. It is an important way to realize the real-time simulation of the converters by improving the computing capability of the simulation system through the field programmable gate array (FPGA). A multi-rate real-time simulation method of converters is proposed by introducing FPGA as a hardware acceleration device to optimize the real-time performance of the simulation system. Aiming at the analysis of the error caused by the multi-rate decoupling of the control system as well as the parallel computing sequence, the improved linear extrapolation algorithm combined with the Lagrange interpolation method is used to effectively reduce the delay error in the multirate parallel simulation sequence after the control system is decoupled. The simulation results show that, compared with the parallel computation without the extrapolation algorithm, the proposed simulation method has higher accuracy. The performance analysis verifies that the established simulation platform has certain advantages in the real-time performance and resource utilization compared with the simulation platforms established solely on CPU or FPGA.