An Input Power Observation-Based DC-Bus Voltage Robust Control Strategy of PV DC Modules Grid-Connected System

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Abstract
Generally, the output power of photovoltaic (PV) is variable and uncertain, which can easily lead to dc-bus voltage fluctuation of the PV grid-connected inverter. To address this issue, a dc-bus voltage robust control strategy of PV dc modules grid-connected system is proposed based on the input power observation, which can improve the dc-bus voltage robustness and reduce grid current harmonics. First, based on the power conservation, a nonlinear disturbance observer of the PV grid-connected inverter is proposed to obtain the dc-side input power quickly and accurately. Subsequently, a feedback linearization-based sliding mode control of PV grid-connected inverter is designed based on the input power observation, which can improve the stability of dc-bus voltage. Meanwhile, the design method of control parameters is introduced, and the system stability is analyzed based on Lyapunov theory. Finally, the effectiveness of the proposed control strategy is verified by simulation and experiment.
Funding Information
  • National Natural Science Foundation of China (52307197)
  • Open Project Program of Guangxi Key Laboratory of Digital Infrastructure (GXDINBC202402)
  • Open Project Program of Guangxi Key Laboratory of Digital Infrastructure (GXDINBC202407)
  • Guangxi Science and Technology Base and Talent Project (GuikeAD23026154)
  • Guangxi Natural Science Foundation (2025GXNSFBA069240)

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