直流微电网多模态协调控制策略研究

Research on Multi-modal Coordinated Control Strategy of DC Microgrid

直流微电网是由分布式电源、储能装置、控制系统等组成的新型电网结构,其控制策略至关重要。首先介绍了直流微电网的组成结构,研究了各个单元的基本功能和作用。其次,从直流母线等效电路入手,进行了直流微电网系统控制目标分析,确定了协调控制策略的基础。然后,以网侧变换器和储能变换器的最低、最高临界电压作为模式切换条件,构建了直流微电网4种工作模式,使直流微电网在各个状态下都能保持稳定运行,同时研究了各个变换器的拓扑结构及控制方法。最后,在MATLAB/Simulink中搭建相应的仿真模型,对所提出的控制策略进行了验证。

The DC microgrid is a new type of power grid structure composed of distributed generation, energy storage devices, control systems, and its control strategy is crucial. The structure of the DC microgrid is introduced, and the basic functions and purposes of each unit are studied. Starting from the DC bus equivalent circuit, the control objectives of the DC microgrid system are analyzed, and the basis of the coordinated control strategy is determined. The minimum and maximum threshold voltages of the side converter and the energy storage converter are used as mode switching conditions, and four working modes of the DC microgrid are constructed so that the DC microgrid can maintain stable operation under various conditions. At the same time, topological structure and control methods of various converters are studied. Finally, the corresponding simulation model is built in MATLAB/Simulink and the proposed control strategy is verified.