TY - JOUR
T1 - Virtual Inertia Control Strategy for Improving Damping Performance of DC Microgrid with Negative Feedback Effect
AU - Yang, Yaqian
AU - Li, Chang
AU - Xu, Jiazhu
AU - Blaabjerg, Frede
AU - Dragicevic, Tomislav
PY - 2021/4
Y1 - 2021/4
N2 - Voltage of DC microgrid is prone to oscillation, originated from the following three factors: 1) negative damping performance of the DC converter; 2) interaction between the power converter and DC network; and 3) positive feedback (PF) of DC voltage control loop. Analogous to the relationship between the force and velocity of motion, it derives the functional relationship between DC current and DC voltage. The motion of DC voltage can be illustrated by the derived vectors since transfer functions between DC current and DC voltage have the corresponding phase and gain at a specific frequency. It is found that it forms a PF when the damping of the DC converter is negative, which can destabilize DC-side voltage at the oscillated frequency. However, a negative feedback can stabilize the system and make the DC voltage attenuated. A virtual inertia (VI) control strategy is proposed for the enhancement of damping performance and forming a negative feedback for the system. The proposed theoretical analysis is demonstrated by Star-Sim hardware-in-the-loop (HIL) experiments.
AB - Voltage of DC microgrid is prone to oscillation, originated from the following three factors: 1) negative damping performance of the DC converter; 2) interaction between the power converter and DC network; and 3) positive feedback (PF) of DC voltage control loop. Analogous to the relationship between the force and velocity of motion, it derives the functional relationship between DC current and DC voltage. The motion of DC voltage can be illustrated by the derived vectors since transfer functions between DC current and DC voltage have the corresponding phase and gain at a specific frequency. It is found that it forms a PF when the damping of the DC converter is negative, which can destabilize DC-side voltage at the oscillated frequency. However, a negative feedback can stabilize the system and make the DC voltage attenuated. A virtual inertia (VI) control strategy is proposed for the enhancement of damping performance and forming a negative feedback for the system. The proposed theoretical analysis is demonstrated by Star-Sim hardware-in-the-loop (HIL) experiments.
KW - Negative damping
KW - Star-Sim hardware-in-the-loop (HIL) experiments
KW - oscillation
KW - positive feedback (PF)
KW - virtual inertia (VI)
UR - http://www.scopus.com/inward/record.url?scp=85095453662&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2020.2998812
DO - 10.1109/JESTPE.2020.2998812
M3 - Journal article
SN - 2168-6777
VL - 9
SP - 1241
EP - 1257
JO - I E E E Journal of Emerging and Selected Topics in Power Electronics
JF - I E E E Journal of Emerging and Selected Topics in Power Electronics
IS - 2
M1 - 9113278
ER -