Dynamic Power Balancing Control Method for Energy Storage DC/DC Parallel Supply System With Low-Frequency Pulsed Load

Abstract

For the energy storage dc/dc parallel supply system with low-frequency pulsed load, an unbalanced dynamic power distribution problem will occur due to the inconsistent dc inertia of each converter, even resulting in a severe continuous low-frequency power oscillation. For this, a dynamic power balancing control method is proposed to reshape their dc inertia to be consistent and realize dynamic power balancing distribution among multiple converters without low-frequency power oscillation. Meanwhile, by analogy with the rotor swing equation of the synchronous machine, the power–voltage equivalent model with introducing the dc inertia parameter is established. Afterward, the essential mechanism of power oscillation with a low-frequency pulsed load is revealed. Furthermore, the principle of the proposed control method is clarified, and the control parameters are reasonably designed. Finally, the effectiveness of the proposed control method is verified experimentally.