TY - JOUR
T1 - Reconsideration of Grid-Friendly Low-Order Filter Enabled by Parallel Converters
AU - Quan, Zhongyi
AU - Li, Yun Wei
AU - Pan, Yiwei
AU - Jiang, Changpeng
AU - Yang, Yongheng
AU - Blaabjerg, Frede
PY - 2021/6
Y1 - 2021/6
N2 - High-order filters, such as inductor-capacitor-inductor ( LCL ) filter, have been popular in grid-tied power converters. Although featuring small size, LCL filters are not grid friendly due to inherent resonance, especially when a large number of converters are in parallel operation in todays electric grid to attain modularity, reliability, and redundancy advantages. Thus, this article reconsiders the low-order L filter in parallel converters to eliminate the resonance and in turn to simplify the control. It is found that by interleaving a certain number of converters, the L filter will be sufficient to meet the harmonic limit requirements of the standards, while the filter size can be even smaller than the LCL filter. This further contributes to cost reduction as a promising solution for grid-friendly converters.
AB - High-order filters, such as inductor-capacitor-inductor ( LCL ) filter, have been popular in grid-tied power converters. Although featuring small size, LCL filters are not grid friendly due to inherent resonance, especially when a large number of converters are in parallel operation in todays electric grid to attain modularity, reliability, and redundancy advantages. Thus, this article reconsiders the low-order L filter in parallel converters to eliminate the resonance and in turn to simplify the control. It is found that by interleaving a certain number of converters, the L filter will be sufficient to meet the harmonic limit requirements of the standards, while the filter size can be even smaller than the LCL filter. This further contributes to cost reduction as a promising solution for grid-friendly converters.
KW - parallel converter
KW - grid-tied converter
KW - interleaving
KW - L-filter
UR - http://www.scopus.com/inward/record.url?scp=85102324560&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2020.3009056
DO - 10.1109/JESTPE.2020.3009056
M3 - Journal article
SN - 2168-6777
VL - 9
SP - 3177
EP - 3188
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 - 3
M1 - 9139439
ER -