LCL filters are adopted to attenuate the switching-frequency harmonics in grid-tied applications. To meet stringent grid requirements, higher order filters have further been proposed. LLCL, is an example, which can provide an additional trap at the switching sideband frequency, and thus, it can better attenuate switching-frequency harmonics. Unlike traditional high-order filters with resonance frequency below the Nyquist frequency, this paper place it of the LLCL above the Nyquist frequency with trap frequency set at the dominant harmonics. Then, with capacitor-current damping, new stability regions are explored and employed for robust design against the grid impedance variations. Simulations verify the analysis and design.
|Titel||Proceedings of the 2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)|
|Status||Udgivet - nov. 2020|
|Begivenhed||9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia - Nanjing, Kina|
Varighed: 29 nov. 2020 → 2 dec. 2020
|Konference||9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia|
|Periode||29/11/2020 → 02/12/2020|