一种基于离散时间交互的改进直流微电网控制策略

直流微电网的控制目标是保证直流微电网的电流分配精度和减小直流母线电压偏差,以维持系统的功率平衡。传统的下垂控制不能同时满足这2个控制目标。利用分布式二次控制框架,文中提出了一种改进的基于离散时间交互的直流微电网控制策略,包括了连续电压控制和离散电流控制,在保证电流分配精度的同时减小了直流母线电压偏差。不同于其他已提出的控制方法,文中所提方法只需要在离散时刻采样电流平均值信息,降低了通信负担。在MATLAB/Simulink软件上搭建了系统仿真模型,仿真验证了所提策略的有效性。

An Improved Control Strategy for DC Microgrid Based on Discrete Time Interaction

The control objective of DC microgrid is to ensure the accuracy of current distribution and reduce the deviation of DC bus voltage, so as to maintain the power balance of the system. These two control objectives cannot be achieved simultaneously by the traditional droop control. By using the distributed secondary control framework, this paper proposes an improved control strategy for DC microgrid based on discrete time interaction, including continuous-voltage control and discrete-current control, which can ensure the accuracy of current distribution and reduce the voltage deviation of DC bus simultaneously. Different from other proposed control methods, the proposed method in this paper only needs to sample the average current information at discrete times, which reduces the communication burden. The system model is built in MATLAB/Simulink to verify the effectiveness of the proposed control strategy.