Multivariable State-Feedback Controller Design for PV Inverter Connected to a Weak Grid

Antoine Musengimana, Haoyu Li, Xuemei Zheng and Yanxue Yu
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Antoine Musengimana: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Haoyu Li: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Xuemei Zheng: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Yanxue Yu: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Energies, 2021, vol. 14, issue 15, 1-17

Abstract: This paper presents a robust multi-input multi-output (MIMO) state-feedback control scheme for a photovoltaic (PV) inverter connected to a weak grid. For a weak grid, the point of common coupling (PCC) voltage is very sensitive to the power disturbances and it is dynamically coupled to the PLL dynamics. So far, most of the control methods do not take into accounts these couplings. Therefore, in this paper, the MIMO controller was designed taking into account the dynamics of the phase-locked loop (PLL) and coupling effects between PCC voltage and the active power to enhance the system’s robustness. As result, the robust performance of the PV inverter interfaced to a weak grid was yielded. In addition, the sensitivity of the system to PLL was eliminated, allowing the use of larger PLL bandwidth even in a very weak grid. Based on the eigenvalues analysis method, a comparative study between the proposed control method and the conventional vector control method was performed. The proposed method is verified with simulations in PLECS and real-time simulations in the RT Box. The results show that the proposed MIMO control method preserves the system stability robustness against any change of grid strength, generated power and PLL bandwidth.

Keywords: linear quadratic regulator (LQR); PV inverter; weak grid; PLL (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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