Analysis and Design of Robust LLCL-Type Filters for Grid-Tied Applications with Capacitor-Current Active Damping

Cai, Pei; Wu, Xiaohua; Yang, Yongheng; Yao, Wenli; Blaabjerg, Frede

doi:10.1109/ipemc-ecceasia48364.2020.9367919

Cited by 1 publication

(1 citation statement)

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“…The known system inherent damping features [26,[47][48][49][50]] are another study path in LCL filters, in addition to the active damping. Furthermore, according to the findings in [51,52], it is learned that irrespective of the damping technique used (passive, active, or damping less), the resonant frequency of the LCL filters should be chosen less than the Nyquist frequency, that is, half the system sampling frequency.…”

Section: Introductionmentioning

confidence: 99%

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Al-Barashi

Liu

et al. 2022

IET Power Electronics

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This paper presents a design technique of magnetic integrated LLCL filters for grid-tied inverters. With the proposed design technique, the LLCL filter's resonant frequency can be higher than the Nyquist frequency. Furthermore, the proposed concept was only reported for the LCL filter in the previous research works. In addition, the modulation process will produce dominant switching harmonics for unipolar PWM H-bridge inverters at the double switching frequency. Thus, putting the resonant frequency beyond the Nyquist frequency will increase the stability zone. The proposed design methods maximize the filter inductors' utilization and resist the grid impedance variations under weak grid conditions, depending on the improved stability zone. Comparative simulation and HIL experimental results are presented to confirm the effectiveness of the proposed magnetic integrated LLCL filter design. The HIL experimental results and the simulation results agree well with each other.

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