Power Hardware-in-the-loop Interfacing via $\mathcal{H}_\infty$ Model Matching
For researchers and engineers in power systems and real-time simulation, this provides a principled method to design stable and accurate PHIL interfaces, though the improvement over existing H∞ approaches is incremental.
The paper proposes an H∞ model matching control approach for power hardware-in-the-loop (PHIL) interfacing that uses transparency as the explicit control objective, achieving accuracy comparable or superior to the ideal transformer method (ITM) while maintaining stability.
This paper presents an $\mathcal{H}_\infty$ model matching control-based approach to the problem of power hardware-in-the-loop (PHIL) interfacing. The objective is to interconnect a grid simulation and a physical device via an interface in a way that is stable and accurate. Conventional approaches include the ideal transformer method (ITM) and its impedance-based variants, which trade accuracy for stability, as well as some $\mathcal{H}_\infty$ control-based approaches, which do not make use of all the available information in their optimization for accuracy. Designing for transparency, as opposed to accuracy as existing approaches do, would achieve both accuracy and stability, while making use of all the dynamical information present in the idealized interconnection of the grid and device. The approach proposed in this paper employs model matching to formulate the PHIL problem as an $\mathcal{H}_\infty$ control problem using transparency as the explicit frequency-domain control objective. The approach is experimentally validated in a real-time resistive-load PHIL setup, and is found to achieve accuracy levels that are comparable or superior to those of an ITM-based interface.