For dynamic stability analysis and instability mechanism understanding of multi-converter medium voltage DC power systems with droop-based double-loop control

an advanced system-level model reduction method is proposed. With this method

mathematical relationships of control parameters (e.g.

current and voltage control parameters) between the system and its equivalent reduced-order model are established. First

open-loop and closed-loop equivalent reduced-order models of current control loop considering dynamic interaction among converters are established. An instability mechanism (e.g.

unreasonable current control parameters) of the system can be revealed intuitively. Theoretical guidance for adjustment of current control parameters can also be given. Then

considering dynamic interaction of current control among converters

open-loop and closed-loop equivalent reduced-order models of voltage control loop are established. Oscillation frequency and damping factor of DC bus voltage in a wide oscillation frequency range (e.g.

10–50 Hz) can be evaluated accurately. More importantly

accuracy of advanced system-level model reduction method is not compromised

even for MVDC power systems with inconsistent control parameters and different number of converters. Finally

experiments in RT-BOX hardware-in-the-loop experimental platform are conducted to validate the advanced system-level model reduction method.