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Power-Hardware-In-The-Loop stability analysis of inverter

Power-Hardware-In-The-Loop (PHIL) combines the advantages of digital real-time simulation and physical simulation to provide a powerful tool for examining the interaction of new energy equipment into the grid. Due to the inherent delay of the hardware device and the characteristics of the emulation device running in steps, there is a delay in the PHIL system, which may cause instability in the system. Since the PHIL system needs to convert between the power signal and the digital signal, it belongs to the digital-analog hybrid simulation, and the stability analysis based on continuous-domain modeling cannot reflect the characteristics of signal discretization. In this paper, the discrete PHIL model of inverter power hardware in the loop is established. Compared with the actual inverter grid-connected system, it is shown that the PHIL system will reduce the stability boundary compared with the actual system. Finally, the correctness of the conclusion is verified by simulation experiments.