Modeling based on work timing and numerical sense of power hardware-in-the-loop simulation

Power hardware-in-the-loop (PHIL) simulation is an advanced testing method with flexibility and fidelity. A PHIL system connects power hardware or physical models under test to a real-time simulator through an interface. This paper studies the basic and general theoretic analysis of PHIL simulation. Work timing, the base of PHIL simulation, is focused and studied in detail. Based on the timing, focusing on a single work cycle, a model in the form of a set of recursive iteration formulas is developed and discussed. Finally, the numerical sense of PHIL simulation is shown by calculation of the local truncation error, which means PHIL simulation works like a numerical algorithm with first-order local accuracy.