ACTIVE DAMPING CONTROL METHOD OF LC-TYPE INVERTER BASED ON NOVEL DIFFERENTIATOR

Yuan Guofeng; Ge Huaiyu

doi:10.19912/j.0254-0096.tynxb.2024-0190

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 462-469. DOI: 10.19912/j.0254-0096.tynxb.2024-0190

ACTIVE DAMPING CONTROL METHOD OF LC-TYPE INVERTER BASED ON NOVEL DIFFERENTIATOR

Yuan Guofeng, Ge Huaiyu

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Abstract

Aiming at the phase lag problem existing in the differentiator of the traditional active damping control method, an active damping control strategy for LC-type off-grid inverters based on a new type of digital differentiator is proposed in this paper. In this method, a new phase compensator is designed to compensate the phase delay of the backward differential differentiator more accurately, and the forward damping interval of the system is increased. The capacitive voltage active damping feedback coefficient has a larger selection interval, and the stability of the system and the ability to suppress the resonance peak are improved. The novel differentiator proposed in this paper is closer to the frequency characteristics of the ideal differentiator, and feedback parameters can be designed based on the active damping control mode of capacitive current feedback. The feasibility and effectiveness of the proposed method are confirmed by simulation and experimental results.

Key words

active damping / differentiator / LC-type off-grid inverter / capacitor voltage feedback

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Yuan Guofeng, Ge Huaiyu. ACTIVE DAMPING CONTROL METHOD OF LC-TYPE INVERTER BASED ON NOVEL DIFFERENTIATOR[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 462-469 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0190

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