Impact Factor:6.153
DOI number:10.1109/TPEL.2020.2990923
Journal:IEEE Transactions on Power Electronics
Key Words:Inverters; Capacitors; Maximum power point trackers; Voltage control; Power harmonic filters; Capacitance; Double-frequency ripple; maximum power point tracking (MPPT) performance improvement; parameter optimization design; second-order sliding mode control (SOSMC); single-stage single-phase photovoltaic (PV) system
Abstract:Due to the inherent double-frequency (2f0) ripple in single-stage single-phase photovoltaic grid-connected inverters, the maximum power point tracking (MPPT) will inevitably be affected. To improve the MPPT performances, a passive LC power decoupling circuit with a robust second-order sliding-mode control (SOSMC) is thus proposed in this article. With the passive LC decoupling path, the double-frequency pulsation on the dc link is effectively cancelled out. Thus, the MPPT accuracy is significantly enhanced, and the utilization of a small dc-link capacitor becomes possible. However, resonance between the LC circuit and the main dc-link capacitor may appear, which can be damped through an active damping method. Additionally, the proposed SOSMC ensures good steady-state, dynamic performance (voltage fluctuation and settling time), and the robustness of the dc-link voltage, which is also beneficial to MPPT control in terms of high accuracy and fast dynamics. The systematic design of SOSMC is presented, and a detailed parameter optimization design of LC decoupling circuit is discussed. Experimental tests are performed on a 2.5-kW single-stage single-phase grid-connected inverter, and the results validate the effectiveness of the proposed strategy.
Co-author:Su, Mei, Wang, Hui, Liu, Bin, Zhang, Xin, Pou, Josep, Yang, Yongheng, Davari, Pooya
First Author:Guo, Bin
Indexed by:Journal paper
Correspondence Author:Sun, Yao
Document Code:20203509110990
Discipline:Engineering
First-Level Discipline:Electrical Engineering
Volume:35
Issue:12
Page Number:13000-13016
ISSN No.:08858993
Translation or Not:no
Included Journals:SCI、EI
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