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Designing a Controller for a Battery Energy Storage System
The integration of renewable energy sources, such as photovoltaics, introduces stability issues to the power grid. Consequently, microgrids are becoming increasingly compelling as they are able to stay in operation during a power outage. The Battery Energy Storage System (BESS) ensures voltage and frequency stability of the microgrid in regular island grid operation. However, during transients, the BESS may reach its current limits and typically is then switched off as a safety precaution. The objective of this project is to devise a control strategy that guarantees voltage and frequency stability, while preventing the system from exceeding its current limits.
This project is part of a collaborative work that is going on between ETH and the grid operator in Walenstadt.
In this student project, we investigate the transient behavior of the BESS during island grid operation.
We explore different control strategies and analyze their behavior during transients, taking into account the current limits of the BESS.
The goal is to stabilize voltage and frequency of the islanding grid while reducing oscillations between the BESS and other participants like the synchronous machine of the hydropower plant.
Tasks:
1. Develop a model of the islanding grid in Walenstadt using a simulation tool such as MATLAB. The model will include the dynamic behavior of the BESS, Photovoltaics, hydropower plants and passive loads.
2. Design the controller for the islanding grid incuding voltage and frequency control.
3. Analyze the performance of the system under different scenarios, such as load steps, Photovoltaic output fluctuations or fault conditions.
4. Evaluate the impact of the current limits on these scenarios.
This project is part of a collaborative work that is going on between ETH and the grid operator in Walenstadt. In this student project, we investigate the transient behavior of the BESS during island grid operation. We explore different control strategies and analyze their behavior during transients, taking into account the current limits of the BESS. The goal is to stabilize voltage and frequency of the islanding grid while reducing oscillations between the BESS and other participants like the synchronous machine of the hydropower plant.
Tasks:
1. Develop a model of the islanding grid in Walenstadt using a simulation tool such as MATLAB. The model will include the dynamic behavior of the BESS, Photovoltaics, hydropower plants and passive loads.
2. Design the controller for the islanding grid incuding voltage and frequency control.
3. Analyze the performance of the system under different scenarios, such as load steps, Photovoltaic output fluctuations or fault conditions.
4. Evaluate the impact of the current limits on these scenarios.