Optimization Design and Control of Single-Stage Single-Phase PV Inverters for MPPT Improvement

Bin Guo, Mei Su, Yao Sun*, Hui Wang, Bin Liu, Xin Zhang, Josep Pou, Yongheng Yang, Pooya Davari

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)
40 Downloads (Pure)

Abstract

Due to the inherent double-frequency (2f0) ripple in single-stage single-phase photovoltaic (PV) 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 paper. 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.
Original languageEnglish
Article number9079646
JournalI E E E Transactions on Power Electronics
Volume35
Issue number12
Pages (from-to)13000-13016
Number of pages17
ISSN0885-8993
DOIs
Publication statusPublished - Dec 2020

Keywords

  • 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

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