TY - GEN
T1 - Discrete-time Direct Pole Placement for Stability Enhancement of LCL-Filtered Inverters in the Synchronous-Reference Frame
AU - Cai, Pei
AU - Wu, Xiaohua
AU - Yang, Yongheng
AU - Yao, Wenli
AU - Li, Weilin
AU - Blaabjerg, Frede
N1 - Publisher Copyright:
© 2020 EPE Association.
PY - 2020/9
Y1 - 2020/9
N2 - For LCL-filtered grid-tied inverters, direct pole-placement techniques can combine the fundamental-frequency current regulation and resonance damping simultaneously. As known, for state-space-based direct pole-placement, to purse sensorless operations, state observers have to be employed, which means heavy computation burden and might limit the switching and sampling frequencies. While for transfer-function-based one, the number of necessary variables decreases and meanwhile it saves the computation load from observers. Therefore, the latter is more suitable in practice. Based on this, this paper extends and summarizes this approach for better accessibility, and it shows that, compared to previous applications in the stationary frame, the transfer-function-based discrete-time domain (z-domain) direct pole placement in the synchronous frame presents better robustness against grid impedance variations, improved phase and gain margins, and simplified feed-forward compensation, presuming the cross coupling is ignored. Simulations have verified the analysis and design.
AB - For LCL-filtered grid-tied inverters, direct pole-placement techniques can combine the fundamental-frequency current regulation and resonance damping simultaneously. As known, for state-space-based direct pole-placement, to purse sensorless operations, state observers have to be employed, which means heavy computation burden and might limit the switching and sampling frequencies. While for transfer-function-based one, the number of necessary variables decreases and meanwhile it saves the computation load from observers. Therefore, the latter is more suitable in practice. Based on this, this paper extends and summarizes this approach for better accessibility, and it shows that, compared to previous applications in the stationary frame, the transfer-function-based discrete-time domain (z-domain) direct pole placement in the synchronous frame presents better robustness against grid impedance variations, improved phase and gain margins, and simplified feed-forward compensation, presuming the cross coupling is ignored. Simulations have verified the analysis and design.
KW - Active damping
KW - Digital control
KW - Regulators
KW - Robustness
KW - Voltage Source Converter (VSC)
UR - http://www.scopus.com/inward/record.url?scp=85094899700&partnerID=8YFLogxK
U2 - 10.23919/EPE20ECCEEurope43536.2020.9215835
DO - 10.23919/EPE20ECCEEurope43536.2020.9215835
M3 - 会议稿件
AN - SCOPUS:85094899700
T3 - 2020 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
BT - 2020 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe
Y2 - 7 September 2020 through 11 September 2020
ER -