A DC component elimination control strategy for the interface system of digital-physical hybrid real-time simulation

Digital-physical hybrid real-time simulation is considered to be an advanced method for future power system simulation. However, the physical interface will inevitably exist DC component, which causes negative effects on practical applications, such as degradation of simulation performance, damage to physical equipment, etc. A novel DC component elimination control strategy for the digital-physical hybrid real-time simulation is proposed in this paper, to improve the performance of the interface system and the precision of simulation results. Based on a universal power interface scheme, the voltage control strategy of the physical interface and the characteristics of the output DC component are analyzed. Aiming at the particularity of hybrid simulation, i.e., the DC component is supposed to be eliminated during steady state but reserved during transient state, an improved voltage control strategy integrating DC component elimination is proposed for the invert link of the physical interface. The proposed control strategy was proved to be effective by experiments of digital-physical hybrid real-time simulation.