Abstract
In this paper, a systematic controller design for a photovoltaic generator with boost converter using integral state feedback control is proposed. It is demonstrated that the state–space feedback enables the extraction of maximum available power under variable loads. For this purpose, a control-oriented state-space model of a photovoltaic array connected to a DC load by a boost converter is derived. This model is then linearized by one working point, but no further simplifications are made. The design-oriented model contains the dynamics of PV generator, boost converter, and the load. The controller design is based on the augmented model with an integral component. The controller is validated by a detailed plant model implemented in Simscape. The robustness of the controller with variable solar irradiation and DC load changes is demonstrated.
Highlights
The increasing need for energy, the high cost of generating electricity, and the sunlight availability made necessary the exploitation of the advantages of power electronics and control techniques which improve the efficiency of solar systems [1]
Instead of perturb and observe (P&O) maximum power point tracking (MPPT) heuristics, a state feedback controller approach to achieve optimal operation was proposed, where the reference voltage of the PV systems is calculated by the P/U curve of the PV cells
The PV array block presented in Matlab/Simulink is modeled according to System Advisor Model (SAM) from the National Renewable Energy Laboratory (NREL) to perform depending on the type and module defined [14,15,16]
Summary
The increasing need for energy, the high cost of generating electricity, and the sunlight availability made necessary the exploitation of the advantages of power electronics and control techniques which improve the efficiency of solar systems [1]. Instead of P&O MPPT heuristics, a state feedback controller approach to achieve optimal operation was proposed, where the reference voltage of the PV systems is calculated by the P/U curve of the PV cells. In this approach, the maximum power point tracking is a set point controlled by regulating the output voltage of the PV array. Authors in [12] adapted a state–space feedback approach to a DC-DC converter in PV systems They used a linear model to represent the PV generator in the system matrix. The results are discussed and compared with well-established methods, such as power optimization by the MPPT algorithm
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