Control of a DC Power System : A comparison of Reactive and MPC controllers
Tamminen, Jussi (2025)
2025
Automaatiotekniikan DI-ohjelma - Master's Programme in Automation Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2025-02-06
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202502052027
https://urn.fi/URN:NBN:fi:tuni-202502052027
Tiivistelmä
Control of direct-current (DC) power systems is a topical research area, particularly as DC systems are increasingly used in renewable energy integration, electric vehicles, and microgrid applications. These systems require precise and robust control mechanisms to ensure efficient power flow, stability, and adaptation to changing operating conditions.
This work aims to find how a DC power system, where the converters on the supply and the load sides can operate on different time scales, can be controlled under changing load-side demands.
To examine this, a simulation test bench is constructed in Simulink, on top of which a reactive control and a model predictive control (MPC) algorithms are developed. A proportional-integral (PI) controller was selected as the reactive controller. The performance of these control algorithms was examined by carrying out various tests.
As a result, it was found that the reactive control algorithm is superior to the MPC algorithm in controlling the DC power system when the load side requirements vary. The reactive controller immediately responded to the changes in the system caused by a changed operating point. The MPC controller did not work as efficiently. Its voltage regulation in the DC link was inferior to the reactive control. To get better results from the MPC control, the nonlinear mathematical model of the bidirectional buck-boost converter should be linearized around more operating points than were considered in this work.
This work aims to find how a DC power system, where the converters on the supply and the load sides can operate on different time scales, can be controlled under changing load-side demands.
To examine this, a simulation test bench is constructed in Simulink, on top of which a reactive control and a model predictive control (MPC) algorithms are developed. A proportional-integral (PI) controller was selected as the reactive controller. The performance of these control algorithms was examined by carrying out various tests.
As a result, it was found that the reactive control algorithm is superior to the MPC algorithm in controlling the DC power system when the load side requirements vary. The reactive controller immediately responded to the changes in the system caused by a changed operating point. The MPC controller did not work as efficiently. Its voltage regulation in the DC link was inferior to the reactive control. To get better results from the MPC control, the nonlinear mathematical model of the bidirectional buck-boost converter should be linearized around more operating points than were considered in this work.