Performance Analysis of Power Hardware-in-Loop Simulation

Abstract

Combining the advantages of real-time digital simulation and analog physical simulation, power hardware-in-loop (PHIL) simulation, also named digital-physical hybrid simulation, is an effective method to analyze fault condition of power system and study distributed generation grid-connected technology. As an important part of PHIL, interface algorithm is a key to ensure system stability and simulation accuracy. This paper investigates two interface algorithms: damped-impedance model and ideal transformer model, and stability and simulation accuracy of PHIL based on above two interface algorithms are discussed respectively. Frequency-domain-based visualized multi-dimensional graphs are constructed to intuitively analyze the influence of impedance relation, harmonic frequency and delay on simulation accuracy. Then, these viewpoints and conclusions are verified with experiments. Finally, according to above analysis, several suggestions are given to configure a practical PHIL.