基于功率信号判别的光-储-燃直流微网协调控制策略研究

Study on DC Microgrid Coordination Control Strategy of Optical-storage-fuel Based on Power Signal Discrimination

在直流微网孤岛模式下,针对常用的分层控制存在储能控制模式切换频繁、电压波动较大等缺点,本文提出一种基于功率信号判别的控制策略。以光伏阵列、混合储能系统、燃料电池构成的直流微网为研究对象,通过对光伏输出功率、直流母线电压电流及混合储能系统的SOC(state of charge荷电状态)等信息的实时采集,判断直流微网内的功率大小和方向,通过对各分布式电源的协调控制,使得微网系统功率达到平衡状态,进而维持直流母线电压的稳定。基于Matlab/Simulink仿真平台上搭建仿真模型,验证了微网不同模式切换控制策略的有效性,其控制策略明显优越于常用的分层控制策略。

Under the isolated island mode of DC microgrid,in view of such shortcomings as frequent switching of energy storage control mode and large voltage fluctuation existing in the common hierarchical control,a kind of control strategy based on power signal discrimination is proposed in this paper.The DC microgrid composed of photovoltaic array,hybrid energy storage system and fuel cell is taken as the study object,the power magnitude and direction in DC microgrid are judged through real-time acquisition of information such as photovoltaic output power,DC bus voltage and current,and SOC(state of charge)of hybrid energy storage system.The balance state of system power of the microgrid is reached through coordinated control of various distributed power sources,thus keeping stability of DC busbar voltage.The simulation model is set up based on the simulation platform of Matlab/Simulink,the effectiveness of different mode switching control strategies in the microgrid is verified and it is shown that the control strategy is obviously superior to the commonly used hierarchical control strategy.