A PLL‐less grid‐tied three‐phase multilevel inverter with reduced
This paper introduces a novel three-phase grid-tied multilevel inverter (MLI) topology that employs a basic unit per phase, yielding a symmetrical configuration capable of
In order to enhance the passivity of LCL-type grid-connected inverters, various admittance shaping methods have been proposed, which mainly reshape the admittance from four perspectives: current regulator, control delay, active damping, and passive damping.
LCL filters have been commonly adopted to filter out switching harmonics generated by inverters due to its better harmonic attenuation ability compared with other filters such as L and LC . However, the inherent LCL -filter resonance peak has the tendency to destabilize the inverter system.
Main contributions are summarized as follows. A unified admittance model of the LCL -type grid-connected inverter is developed for inverter-side and grid-side current control to facilitate the passivity-based stability analysis and the study of the effect of control delay and CVF-AD on the passivity properties of inverter output admittance.
The Grid-connected inverter (GCI) often operates in the weak grid with asymmetrical grid impedance due to the unbalanced and single-phase loads. However, the time-periodic dynamic behavior effect of the Phase-Locked Loop (PLL) on the GCI operating in an asymmetrical system is not investigated in the time domain.
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