Aiming at the power quality and circulation problems of DC microgrid, a residual dynamic decentralized compensation control strategy which takes into account the disturbance suppression of DC microgrid is proposed. Based on the DC droop control, this strategy first analyzes the disturbance problem of the DC microgrid and the circulation problem in the parallel state. Secondly, a state space model of Buck-type and Boost-type multi-DC-DC converters in parallel is established, and the dynamic decentralized compensation structure of the converter based on residual is derived. The structure is directly compensated at the output of the voltage loop, and the compensation controller Q*(s) is calculated by the disturbance cancellation. The small signal stability analysis method is used to prove the stability of the compensation structure in this paper. Finally, build a digital physics experiment platform based on RTDS, and take the same and different types of converters in parallel for experimental verification. This structure can speed up the dynamic response speed of the DC bus voltage when the distributed power supply and public load are switched on and off, and effectively suppress the influence of circulating current and The double power frequency disturbance of the DC bus voltage caused by the imbalance of the AC side maintains the consistency of the voltage, ensures the stability of the bus voltage, and helps to realize the "plug and play" technology of distributed power. © 2021, Electrical Technology Press Co. Ltd. All right reserved.
