Research on voltage fluctuation suppression of AC/DC hybrid distribution network in coal mine based on direct energy storage control

Building a coal mine AC/DC hybrid distribution network is an important component of modernizing coal mine construction. In response to bus voltage fluctuations caused by sudden load changes, this article, based on the analysis of bus voltage fluctuation principles, focuses on the DC-side energy storage topology and proposes a bus voltage fluctuation suppression strategy based on voltage feedback. This control strategy incorporates bus voltage feedback into the traditional constant power control, allowing for rapid compensation of system imbalanced power to suppress bus voltage fluctuations. In this paper, the simulation model of coal mine AC/DC hybrid distribution network is built in PSCAD/EMTDC, and the Hardware in the Loop (HIL) experiment is carried out in the Real Time Laboratory (RT-LAB). The effectiveness of the proposed method to suppress bus voltage fluctuation is verified, which provides a certain theoretical support for the construction of AC/DC hybrid distribution network for coal mine.