A Study on Novel Current Controller for Improving Transient Characteristics in Direct Current Power Systems

This study proposes a novel current controller to enhance the transient response characteristics and control responsiveness of energy storage systems (ESSs) in DC power systems. To achieve this, an Enhanced Transient High-Speed Controller (ETHSC) is introduced, which improves upon the conventional Transient High-Speed Controller (THSC) by incorporating real-time error compensation for excitation voltage application time. The ETHSC calculates the inductor’s flux linkage λ in real-time and corrects errors caused by the nonlinear characteristics of inductance, ensuring more stable control performance. This study further analyzes the limitations of the conventional THSC and mathematically formulates the ETHSC architecture, introducing a real-time inductance correction algorithm to enhance transient response and stability. The proposed controller was implemented in a boost converter topology and compared with the conventional THSC. Through PSIM simulations and a 500 W prototype experiment, the ETHSC demonstrated its ability to maintain fast transient response while significantly reducing overshoot caused by inductor nonlinearity. These results confirm that the ETHSC provides a more stable and efficient control strategy compared to conventional transient controllers, making it a promising solution for high-performance DC power systems.