TY - GEN
T1 - Weak Grid Impacts on the Design of Voltage Source Inverters - Virtual Inductance
AU - Adib, Aswad
AU - Fateh, Fariba
AU - Mirafzal, Behrooz
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9/10
Y1 - 2018/9/10
N2 - In this paper, a virtual inductance control scheme is proposed to improve the stability of voltage source inverters (VSIs) in weak grids. The large grid impedance in weak grids can make grid-tied VSIs unstable. To keep VSIs stable in weak grids, control and circuit parameters can be designed to expand the stable operating region of VSIs. In this paper, a closed-loop state-space model is developed for PQ-controlled VSIs with the virtual inductance term in the controller. Using the root locus analysis, impacts of the LCL filter inductance, as well as the virtual inductance feedforward controller on the stability of VSIs are studied. The performance of the virtual inductance is then verified for both symmetrical and asymmetrical grid impedance setups through hardware tests carried out on a three-phase grid-tied VSI in the laboratory.
AB - In this paper, a virtual inductance control scheme is proposed to improve the stability of voltage source inverters (VSIs) in weak grids. The large grid impedance in weak grids can make grid-tied VSIs unstable. To keep VSIs stable in weak grids, control and circuit parameters can be designed to expand the stable operating region of VSIs. In this paper, a closed-loop state-space model is developed for PQ-controlled VSIs with the virtual inductance term in the controller. Using the root locus analysis, impacts of the LCL filter inductance, as well as the virtual inductance feedforward controller on the stability of VSIs are studied. The performance of the virtual inductance is then verified for both symmetrical and asymmetrical grid impedance setups through hardware tests carried out on a three-phase grid-tied VSI in the laboratory.
KW - Voltage source inverter
KW - stability analysis
KW - unbalanced grid impedance
KW - virtual inductance
KW - weak grid
UR - http://www.scopus.com/inward/record.url?scp=85054548829&partnerID=8YFLogxK
U2 - 10.1109/COMPEL.2018.8459926
DO - 10.1109/COMPEL.2018.8459926
M3 - Conference contribution
AN - SCOPUS:85054548829
SN - 9781538655412
T3 - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
BT - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Y2 - 25 June 2018 through 28 June 2018
ER -