Abstract: The development of flexible power electronics technology has made the new energy DC collection system an important solution choice. The pure DC collection of new energy presents the characteristics of multiple voltage levels, and the bus voltage is often controlled by a single ended converter station. When there is load disturbance in the system, the bus voltage undergoes significant fluctuations, which affects the stable operation of the system. In response to this issue, this article models and analyzes the voltage disturbance characteristics of multi voltage level DC buses, and proposes a coordinated control method between multi voltage level buses. The task of DC bus voltage control is assigned to the DC transformers at both ends of the bus through a coordinated control strategy, achieving effective suppression of DC bus voltage fluctuations. The research results indicate that the proposed bus coordinated control can effectively improve the anti-interference and stability characteristics of DC bus voltage. Finally, the correctness and effectiveness of the proposed coordinated control strategy were verified through Matlab/Simulink software simulation and the establishment of a low-voltage experimental platform.