A Novel Interface Modeling Method of Power Hardware-in-the-loop Simulation for MMC-HVDC System Based on ITM and DIM Switching

In this paper, based on the comparative analysis of the interface characteristics between ideal transformer model (ITM) method and damping impedance method (DIM), a novel interface modeling method based on ITM and DIM switching is proposed to improve the stability and simulation accuracy of power hardware-in-the-loop (PHIL) simulation for MMC-HVDC system. According to the structure principle of two interface algorithms, the ITM and DIM switching method is proposed to realize the effective switching of interface characteristics, which can be achieved by changing additional impedance parameters of DIM. The calculation process of equivalent impedance for the MMC AC side is simplified to realize the real-time impedance matching of DIM, and the switching criterion and solution of maloperation are designed based on the interface stability of ITM. Finally, the effectiveness of the proposed control methods are verified by simulation results.