The energy transition towards renewable sources and the constant urge for sustainable solutions demands increasingly sophisticated and efficient energy management systems. In this context, this bachelor’s thesis addresses a fundamental challenge: the dynamic control of a hybrid energy storage system, more specifically a cascaded configuration of Buck and Boost converters.
This arrangement, which is crucial for managing multiple batteries with different voltages, presents inherent complexity, particularly due to the nonlinearity of the Boost converter.
The primary objective was to design and implement a control strategy for this system, demonstrating that a linearization-based approach is a viable and effective method for robust operation, given certain hypothesis and considerations. To achieve this, the problem was divided into two stages.
First, a rigorous theoretical analysis of each subsystem (Buck and Boost) was conducted in continuous conduction mode (CCM). The most critical step was the linearization of the Boost converter, which allowed for the derivation of its transfer functions and simplification of the control design.
Subsequently, Proportional-Integral-Derivative (PID) controllers were designed to regulate both the output voltage and the inductor current.
The implementation and verification of the complete system were carried out using advanced simulations in MATLAB and PLECS, which proved the efficacy of the controllers in realistic scenarios.
The simulation results confirmed that the designed control is effective and robust within a defined operational range. However, they also revealed the inherent limitations of PID control when faced with the complex, nonlinear dynamics of such a system, especially under low-resistance conditions which are not representative of real-world applications.
These conclusions not only validate the linearization approach for a first approximation but also highlight the need for more advanced explorations.
The project’s findings pave the way for future research, suggesting the use of nonlinear controls, analysis in other operational modes and exploration of bidirectional power flux conversion systems. All efforts focused on overcoming difficulties in order to develop physical prototypes, improving the architectural capabilities, and both efficiency and efficacy, as the final step.
This project, therefore, not only demonstrates a viable and accessible technical solution but also underscores the importance of simulation tools for the development of control systems in engineering, offering an engineering and general knowledge base and vision for both actual and future advancements in the field of power electronics.
The energy transition towards renewable sources and the constant urge for sustainable solutions demands increasingly sophisticated and efficient energy management systems. In this context, this bachelor’s thesis addresses a fundamental challenge: the dynamic control of a hybrid energy storage system, more specifically a cascaded configuration of Buck and Boost converters.
This arrangement, which is crucial for managing multiple batteries with different voltages, presents inherent complexity, particularly due to the nonlinearity of the Boost converter.
The primary objective was to design and implement a control strategy for this system, demonstrating that a linearization-based approach is a viable and effective method for robust operation, given certain hypothesis and considerations. To achieve this, the problem was divided into two stages.
First, a rigorous theoretical analysis of each subsystem (Buck and Boost) was conducted in continuous conduction mode (CCM). The most critical step was the linearization of the Boost converter, which allowed for the derivation of its transfer functions and simplification of the control design.
Subsequently, Proportional-Integral-Derivative (PID) controllers were designed to regulate both the output voltage and the inductor current.
The implementation and verification of the complete system were carried out using advanced simulations in MATLAB and PLECS, which proved the efficacy of the controllers in realistic scenarios.
The simulation results confirmed that the designed control is effective and robust within a defined operational range. However, they also revealed the inherent limitations of PID control when faced with the complex, nonlinear dynamics of such a system, especially under low-resistance conditions which are not representative of real-world applications.
These conclusions not only validate the linearization approach for a first approximation but also highlight the need for more advanced explorations.
The project’s findings pave the way for future research, suggesting the use of nonlinear controls, analysis in other operational modes and exploration of bidirectional power flux conversion systems. All efforts focused on overcoming difficulties in order to develop physical prototypes, improving the architectural capabilities, and both efficiency and efficacy, as the final step.
This project, therefore, not only demonstrates a viable and accessible technical solution but also underscores the importance of simulation tools for the development of control systems in engineering, offering an engineering and general knowledge base and vision for both actual and future advancements in the field of power electronics. Read More
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