基于有限时间动态平均一致的直流微电网二次控制

Secondary Control for DC Microgrid with Finite-time Dynamic Average Consensus

针对直流微电网下垂控制难以同时保证电压调节和电流精准分配的问题,提出了一种基于有限时间动态平均一致的二次控制算法。首先,为了得到虚拟压降的平均值,设计了动态平均一致算法,根据转换器补偿电压的估计值、二次控制电压和估计值之间的关系以及传统电压、电流之间的关系,建立电压调节和电流精准分配的模型;然后,设计了基于有限时间的动态平均一致算法来得到补偿电压的平均值,根据一阶微分系统有限时间稳定公式,证明该模型在有限稳定时间上可以实现电压调节和电流精准分配,并且能够得到稳定时间;最后,通过仿真实验验证了所提控制算法的有效性。

A secondary control algorithm based on finite-time dynamic average consensus is proposed to solve the problem that DC microgrid droop control is difficult to ensure voltage regulation and accurate current distribution at the same time.Firstly,in order to obtain the average value of the virtual voltage drop,a dynamic average consensus algorithm is designed to establish the voltage according to the estimated value of the converter compensation voltage,the relationship between the secondary control voltage and the estimated value,and the relationship between the traditional voltage and current.The model of voltage regulation and accurate current allocation are given.Then,a finite-time dynamic average consensus algorithm is designed to obtain the average value of the compensation voltage.According to the finite-time stability theory of the first-order differential system,it is proved that the proposed method can achieve voltage regulation and current accurately allocation,and the stable time can be obtained.Finally,the effectiveness of the proposed control algorithm is verified by simulation experiments.