Abstract
This paper proposes a maximum power point tracking (MPPT) and voltage regulation method based on model predictive control (MPC) for the two-stage grid-tied photovoltaic (PV) system, which can achieve MPPT and output voltage regulation of a PV system simultaneously. The MPPT algorithm based on MPC is implemented in a DC-DC boost converter. The reference voltage at maximum power point is obtained by dual step Incremental Conductance (I&C) algorithm under the rapidly varying illumination intensity, and the MPPT controller only needs to minimize one cost function of PV current, without pulse width modulation (PWM) module. To inject the generated PV power into the grid with high quality, this paper designs voltage regulation controller based on MPC to maintain the output voltage of the PV system at the desired value. The MPC controller outputs the optimal duty signal with the input and state constraints in the inner loop, and the PI controller in the outer loop is designed to improve the dynamic performance. The proposed method based on MPC was demonstrated using the SimPower systems tool in MATLAB/Simulink. Analysis and simulation results for the PV system show possible improvements on the closed-loop performance such as fast response and low overshoot.
Highlights
With the development of renewable energy sources, solar energy, as a widespread and clean energy, has attracted the scientific and industrial interest in recent years
The proposed maximum power point tracking (MPPT) and voltage regulation control methods based on model predictive control (MPC) for the PV system were applied using SimPower systems tool in MATLAB/Simulink, which provides component libraries and analysis tools to investigate system-level performance for the electrical power system
This paper proposes the cascaded MPPT and cascade voltage regulation control strategy based on MPC for the two-stage grid-tied PV system, which can achieve MPPT and output voltage regulation of PV system, simultaneously
Summary
With the development of renewable energy sources, solar energy, as a widespread and clean energy, has attracted the scientific and industrial interest in recent years. The MPC method is an attractive alternative to control the output voltage of DC-DC converter in power systems. To inject the generated PV power into the grid with high quality and improve the efficiency of the PV system, it is crucial to achieve MPPT of the PV system together with voltage regulation. The MPPT method based on MPC is proposed to track the maximum power point of PV cell module via DC-DC boost converter. The reference voltage at maximum power point is obtained by dual step I&C algorithm under the rapidly varying illumination intensity, and the MPPT controller only needs to minimize one cost function of PV current, without PWM module. The voltage control method based on MPC is applied to the DC-DC buck converter to improve the response speed and reduce the overshoot for output voltage regulation.
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