High-Speed Controller to Enhance Responsiveness and Stability of Dynamic Characteristics for DC-DC Converter

As the demand for digital systems that require dc power increases rapidly, the importance of stable dc power supply methods increases. Various elements, such as renewable energy and load, are configured in the power grid that supplies dc, and they are connected in various forms and power patterns. These elements have different starting and operating characteristics, which can be disadvantageous to the design of controllers for power converters to maintain a stable bus voltage in the dc power grid. Therefore, in a dc power system, an energy storage system with active bidirectional power control technology that can minimize transient conditions, such as overshoot, which can occur when a load is connected or power accelerates rapidly, is significantly important. This article proposes a novel power control method capable of compensating for the instability of the dc bus voltage owing to the transient state in the dc power supply system. This method minimizes overshoot and ensures fast responsiveness and system stability by calculating the flux linkage of an inductor in a bidirectional dc-dc converter and applying an excitation voltage without pulsewidth modulation switching. The performance and validity of the proposed transient high-speed controller are verified through simulations and experiments.