传统直流微电网协调控制策略在下垂控制中忽略了电源的功率输出边界动态变化对系统的影响，模式切换控制结构复杂且存在非平滑切换的问题。针对此问题，以光储氢直流微电网为研究对象，提出了一种并离网相统一的协调控制策略。首先，提出了一种动态自适应下垂控制策略，通过向基于最小二乘法原理的数据拟合器输入训练数据，拟合输出动态电流边界，实现了自适应调整动态下垂系数及电源运行状态，并简化了传统模式切换过程和控制结构。其次，结合实际工程，提出一种预同步和外环切换控制相结合的改进并离网切换控制策略，有效降低并离网切换过程中的冲击振荡。最后，将自适应下垂控制和改进并离网平滑切换控制融入所提协调控制策略中，进行多源多工况的多种模式切换的仿真。通过仿真验证了所提协调控制策略的有效性。

Traditional coordinated control strategies for DC microgrid often overlook the dynamic changes in the power output boundaries of energy sources in droop control, which affects the system, and the mode switching control structure is complex, leading to non-smooth transitions. To address this issue, this paper proposed a unified grid-connected and off-grid coordinated control strategy for a solar-hydrogen-storage DC microgrid. First, a dynamic adaptive droop control strategy was proposed, which utilized the least squares method for data fitting to dynamically adjust the current boundaries, achieving adaptive regulation of the droop coefficient and power source operating state, thereby simplifying the traditional mode switching process and control structure. Second, in combination with practical engineering, an improved grid-connected and off-grid switching control strategy was proposed, which integrated pre-synchronization and outer-loop switching control, effectively reducing impact oscillations during the switching process. Finally, the adaptive droop control and improved smooth switching control were integrated into the proposed coordinated control strategy, and simulations of multi-source, multi-condition mode switching were conducted. The simulation results verified the effectiveness of the proposed coordinated control strategy.

国家能源集团科技项目（GJNY-21-189）；国家重点研发计划项目（2021YFB2601403）