TY - GEN
T1 - Mechanism analysis and mitigation of instability in grid-connected Voltage Source Inverter with LCL filters based on terminal impedance
AU - Liu, Teng
AU - Liu, Zeng
AU - Liu, Jinjun
AU - Dou, Qingyun
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/5/10
Y1 - 2016/5/10
N2 - Grid-connected Voltage Source Inverter (VSI) with LCL filters, controlled by proportional-resonant compensator, is very popular in utility application for its better power quality feature, while it is prone to instability especially under weak grid condition. This paper deals with this issue utilizing the terminal impedances of the inverter and the grid. Firstly, the instability mechanism is revealed by modeling the inverter output impedance, and it is observed that the item, contributing to the instability, is a sudden peak in the magnitude of the inverter output admittance. Moreover, it is found that this peak is inevitable, and is introduced by a stable designed inverter with high current control loop bandwidth. Secondly, to dampen out this peak for mitigating the instability, a novel control method based on adding lag compensator directly into the current control loop is proposed without extra needs on the current and voltage sensors. Lastly, the effectiveness of the proposed instability mitigation scheme is verified both by the simulation and experimental results.
AB - Grid-connected Voltage Source Inverter (VSI) with LCL filters, controlled by proportional-resonant compensator, is very popular in utility application for its better power quality feature, while it is prone to instability especially under weak grid condition. This paper deals with this issue utilizing the terminal impedances of the inverter and the grid. Firstly, the instability mechanism is revealed by modeling the inverter output impedance, and it is observed that the item, contributing to the instability, is a sudden peak in the magnitude of the inverter output admittance. Moreover, it is found that this peak is inevitable, and is introduced by a stable designed inverter with high current control loop bandwidth. Secondly, to dampen out this peak for mitigating the instability, a novel control method based on adding lag compensator directly into the current control loop is proposed without extra needs on the current and voltage sensors. Lastly, the effectiveness of the proposed instability mitigation scheme is verified both by the simulation and experimental results.
KW - grid-connected voltage sourece inverter
KW - impedance-based stability criterion
KW - instability mechanism
KW - lag compensator
KW - LCL filters
UR - https://www.scopus.com/pages/publications/84973621918
U2 - 10.1109/APEC.2016.7468182
DO - 10.1109/APEC.2016.7468182
M3 - 会议稿件
AN - SCOPUS:84973621918
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 2272
EP - 2277
BT - 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Y2 - 20 March 2016 through 24 March 2016
ER -