TY - JOUR
T1 - Passivity Fractional-Order Sliding-Mode Control of Grid-Connected Converter With LCL-Filter
AU - Long, Bo
AU - Mao, Wen Ze
AU - Lu, Peng Jie
AU - Rodriguez, Jose
AU - Guerrero, Josep M.
AU - Kil, To Chong
AU - Teng, Yun Long
N1 - Publisher Copyright:
IEEE
PY - 2023/6/1
Y1 - 2023/6/1
N2 - Grid-connected converter with LCL filter plays an important role in renewable power generation systems. However, existing control techniques face several challenges in practice (e.g., difficulty in parameter design, slow dynamic response, and poor robustness under slowly time-varying filter parameter, deadtime of power devices, and external disturbances). To solve these difficulties, a passivity-based fractional-order sliding-mode control (PBC-FOSMC) hybrid controller, which combines the merits of passivity-based control (PBC) and FOSMC, is proposed, where the inputs of the passive controller are the outputs of the FOSMC controller. First, a passive current controller is designed based on the Euler-Lagrange model established by damping injection according to the PBC theory, which can make the system automatically converge to meet the energy dissipation law. Second, an FOSMC controller is designed to further enhance the system robustness to counter disturbances and compensate the reference current accuracy of PBC. The introduced fractional order can successfully suppress the undesired chattering due to the switching behaviors in conventional sliding-mode control. Third, the hybrid PBC-FOSMC controller is derived and system stability is analyzed. Finally, experimental results under 10-kW prototype validate the excellent performance of the proposed method in terms of robustness, dynamic performance, strong perturbation rejection ability, etc., and the desired control targets are achieved.
AB - Grid-connected converter with LCL filter plays an important role in renewable power generation systems. However, existing control techniques face several challenges in practice (e.g., difficulty in parameter design, slow dynamic response, and poor robustness under slowly time-varying filter parameter, deadtime of power devices, and external disturbances). To solve these difficulties, a passivity-based fractional-order sliding-mode control (PBC-FOSMC) hybrid controller, which combines the merits of passivity-based control (PBC) and FOSMC, is proposed, where the inputs of the passive controller are the outputs of the FOSMC controller. First, a passive current controller is designed based on the Euler-Lagrange model established by damping injection according to the PBC theory, which can make the system automatically converge to meet the energy dissipation law. Second, an FOSMC controller is designed to further enhance the system robustness to counter disturbances and compensate the reference current accuracy of PBC. The introduced fractional order can successfully suppress the undesired chattering due to the switching behaviors in conventional sliding-mode control. Third, the hybrid PBC-FOSMC controller is derived and system stability is analyzed. Finally, experimental results under 10-kW prototype validate the excellent performance of the proposed method in terms of robustness, dynamic performance, strong perturbation rejection ability, etc., and the desired control targets are achieved.
KW - Circuit stability
KW - Control systems
KW - Damping
KW - Euler-Lagrange (EL) model
KW - LCL-filter
KW - Power harmonic filters
KW - Power system stability
KW - Robustness
KW - Stability analysis
KW - fractional-order
KW - grid-connected converter
KW - passivity-based control
KW - sliding-mode control
KW - LCL filter
KW - sliding-mode control (SMC)
KW - grid-connected converter (GCC)
KW - fractional order
KW - passivity-based control (PBC)
UR - http://www.scopus.com/inward/record.url?scp=85149390473&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2023.3244754
DO - 10.1109/TPEL.2023.3244754
M3 - Journal article
AN - SCOPUS:85149390473
SN - 0885-8993
VL - 38
SP - 6969
EP - 6982
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 6
ER -