TY - JOUR
T1 - Control Strategy of Single-Phase Hybrid-Mode Ćuk Inverter for LVRT Capability
AU - Han, Byeongcheol
AU - Bai, Changkyu
AU - Lai, Jih Sheng
AU - Kim, Minsung
N1 - Publisher Copyright:
© 2013 IEEE.
PY - 2020/12
Y1 - 2020/12
N2 - This article proposes a control strategy for a Ćuk module-integrated inverter (MII) with hybrid operation mode for low-voltage ride-Through (LVRT) capability. The hybrid-mode Ćuk MII operates in unfolding-Type power conversion (UPC) mode during normal grid conditions and in two-stage power conversion (TPC) mode during grid faults. It also has the advantages of highly efficient power transfer and LVRT capability but is difficult to control because UPC and TPC modes have distinct system dynamics and suffer from grid voltage disturbances that have different magnitudes. To overcome this control problem, this article proposes a control strategy that corresponds to the operating mode of the hybrid-mode Ćuk inverter. To achieve zero steady-state tracking error during the grid disturbance, a repetitive controller (RC) is used in the proposed control scheme. Different phase-lead compensators in the RC compensate for different phase lags caused by distinct system dynamics. To reduce the burden from the RC, different nominal duty ratios are used as the feedforward control input. To minimize the tracking error during grid faults, a proportional-resonant controller is used in parallel with the RC controller in the TPC mode. To analyze the stability of different control systems, a unified control system model is presented for the proposed inverter. The procedure to select control parameters is also presented in detail. Simulation results validate the proposed control scheme in the hybrid-mode Ćuk inverter, and experiments are conducted using the 400-VA MII prototype to demonstrate its validity.
AB - This article proposes a control strategy for a Ćuk module-integrated inverter (MII) with hybrid operation mode for low-voltage ride-Through (LVRT) capability. The hybrid-mode Ćuk MII operates in unfolding-Type power conversion (UPC) mode during normal grid conditions and in two-stage power conversion (TPC) mode during grid faults. It also has the advantages of highly efficient power transfer and LVRT capability but is difficult to control because UPC and TPC modes have distinct system dynamics and suffer from grid voltage disturbances that have different magnitudes. To overcome this control problem, this article proposes a control strategy that corresponds to the operating mode of the hybrid-mode Ćuk inverter. To achieve zero steady-state tracking error during the grid disturbance, a repetitive controller (RC) is used in the proposed control scheme. Different phase-lead compensators in the RC compensate for different phase lags caused by distinct system dynamics. To reduce the burden from the RC, different nominal duty ratios are used as the feedforward control input. To minimize the tracking error during grid faults, a proportional-resonant controller is used in parallel with the RC controller in the TPC mode. To analyze the stability of different control systems, a unified control system model is presented for the proposed inverter. The procedure to select control parameters is also presented in detail. Simulation results validate the proposed control scheme in the hybrid-mode Ćuk inverter, and experiments are conducted using the 400-VA MII prototype to demonstrate its validity.
KW - Fault ride-Through
KW - grid fault
KW - module integrated inverter
KW - proportional-resonant (PR) controller
KW - reactive power transfer
KW - repetitive controller (RC)
UR - http://www.scopus.com/inward/record.url?scp=85096035752&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2019.2942631
DO - 10.1109/JESTPE.2019.2942631
M3 - Article
AN - SCOPUS:85096035752
SN - 2168-6777
VL - 8
SP - 3917
EP - 3932
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 4
M1 - 8845631
ER -