TY - JOUR
T1 - A Multivariable Controller in Synchronous Frame Integrating Phase-Locked Loop to Enhance Performance of Three-Phase Grid-Connected Inverters in Weak Grids
AU - Silwal, Sushil
AU - Karimi-Ghartemani, Masoud
AU - Karimi, Houshang
AU - Davari, Masoud
AU - Zadeh, S. Milad Hoseini
N1 - Publisher Copyright:
© 1986-2012 IEEE.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - This article presents a new current controller in the synchronous reference frame and its associated design for enhancing the performance of three-phase grid-connected inverters, especially against weak-grid conditions. The existing controllers do not perform strongly during high-impedance grid conditions and lead to oscillations and instability issues due to the interactions between the synchronization and control units. The proposed controller addresses this issue by 1) deriving a linear model of the three-phase phase-locked loop (PLL), 2) integrating the PLL model into the current controller design, 3) using a multivariable control design for multi-input multi-output systems, and 4) designing the controller gains using optimal linear quadratic theory. The proposed controller has superior performance over a substantially wider range of weak-grid conditions compared to conventional controllers. Extensive simulation and experimental results are presented in order to validate and reveal the desirable performance of the proposed controller.
AB - This article presents a new current controller in the synchronous reference frame and its associated design for enhancing the performance of three-phase grid-connected inverters, especially against weak-grid conditions. The existing controllers do not perform strongly during high-impedance grid conditions and lead to oscillations and instability issues due to the interactions between the synchronization and control units. The proposed controller addresses this issue by 1) deriving a linear model of the three-phase phase-locked loop (PLL), 2) integrating the PLL model into the current controller design, 3) using a multivariable control design for multi-input multi-output systems, and 4) designing the controller gains using optimal linear quadratic theory. The proposed controller has superior performance over a substantially wider range of weak-grid conditions compared to conventional controllers. Extensive simulation and experimental results are presented in order to validate and reveal the desirable performance of the proposed controller.
KW - Linear quadratic regulator (LQR)
KW - multi-input multi-output (MIMO) controller
KW - phase-locked loop (PLL)
KW - three-phase grid-connected voltage-source converter (VSC)
KW - weak grids
UR - http://www.scopus.com/inward/record.url?scp=85127756008&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2022.3164878
DO - 10.1109/TPEL.2022.3164878
M3 - Article
AN - SCOPUS:85127756008
SN - 0885-8993
VL - 37
SP - 10348
EP - 10359
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 9
ER -