Virtual Inertia Control Strategy for Improving Damping Performance of DC Microgrid With Negative Feedback Effect

Voltage of DC microgrid is prone to oscillation, originated from the following three factors: 1) negative damping performance converter; 2) interaction between power converter and network; 3) positive feedback (PF) voltage control loop. Analogous relationship force velocity motion, it derives functional current voltage. The motion can be illustrated by derived vectors since transfer functions have corresponding phase gain at a specific frequency. It found that forms PF when negative, which destabilize DC-side oscillated However, stabilize system make attenuated. A virtual inertia (VI) strategy proposed for enhancement forming system. theoretical analysis demonstrated Star-Sim hardware-in-the-loop (HIL) experiments.