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How to Tune PID Controller in PV Battery System in MATLAB

How to Tune PID Controller in PV Battery System in MATLAB


We'll explore the design and functionality of a power electronics (PE) system integrated with a battery, employing bi-directional control for optimal performance. The system requires the use of a controller, particularly a Proportional-Integral-Derivative (PID) controller, to regulate the direct current (DC) voltage to approximately 24 volts.

Controller Configuration

The PID controller is instrumental in maintaining the desired DC voltage level by comparing the measured photovoltaic (PV) voltage with a reference voltage. This comparison is facilitated by combining the DC bus voltage with the reference voltage and processing the resultant value through the PID controller to generate the appropriate periodic signal.

Tuning the Controller

To ensure the effective operation of the PID controller, it's crucial to properly tune its parameters. This involves adjusting the proportional, integral, and derivative gains to achieve stable and responsive system behavior. Through iterative tuning and analysis, the controller's parameters are optimized to achieve the desired performance metrics.

Simulation Process

The simulation process involves collecting data to facilitate the tuning of the PID controller. By generating identification data and utilizing auto-estimation techniques, the system's dynamics and characteristics are analyzed. This data is then used to fine-tune the PID controller parameters, ensuring that the system operates within specified stability and performance bounds.

Validation and Analysis

Once the PID controller parameters are tuned, the system's response is validated through simulation. By analyzing the response characteristics, including stability, overshoot, and settling time, the effectiveness of the controller tuning is assessed. Adjustments may be made iteratively until the desired system response is achieved.

Conclusion

In conclusion, the design simulation of a PE system with battery utilizing bi-directional control offers valuable insights into the integration of renewable energy sources and energy storage systems. By employing sophisticated control algorithms such as PID, it's possible to achieve efficient and stable operation, maximizing the utilization of renewable energy resources for sustainable power generation.

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