A COMPARISON OF PI AND MPC CONTROL STRATEGIES FOR BIDIRECTIONAL DC-DC CONVERTERS IN BATTERY SYSTEMS

Resumo

Currently, advances in research on battery energy storage systems (BESS), as well as their implementation in various renewable energy generation systems—environmentally friendly and based on non-storable primary resources such as wind and solar energy—have created a demand for highly functional DC–DC converters with diverse topologies, configurations, and bidirectional capabilities. This paper presents a comparison between a Proportional–Integral (PI) controller and a Model Predictive Control (MPC) strategy applied to a bidirectional DC–DC converter, focusing on the response times and dynamic behavior of both controllers. The DC–DC converter is connected to a BESS through the direct current link (DC link), and the main objective of both controllers is to regulate the DC link voltage to keep it within the required values. To achieve this, it is necessary to inject or absorb active power to charge or discharge the battery bank. The results validate the dynamic performance of the proposed controllers and highlight the differences in their transient responses.