中文摘要：

双向AC-DC变换器作为交直流混合微电网的重要组成部分,对系统的稳定运行和功率的协调分配有着重要作用。本文基于切换系统理论,提出一种双向AC-DC切换控制方法。该方法首先建立双向AC-DC切换动态模型,选取系统的储能函数作为共同Lyapunov函数。基于此,设计了系统最优切换律并分析了该切换律条件下系统在切换平衡点处的稳定性。为了便于控制器数字化实现,建立了切换系统单步预测模型并对切换策略离散化。仿真和实验结果验证了本文所采用的建模方法和控制策略的有效性。

英文摘要：

As a significant component in AC-DC hybrid microgrid, Bi-directional AC-DC converter plays an important role in stabilizing system as well as adjusting allocation of power. In this paper, a novel control strategy for Bi-directional AC-DC converter based on switched system modeling has been established. First, a switched dynamic modeling is established. A common Lyapunov function is proposed based on the system energy storage function. Then an optimal switching sequence is proposed and the system stability is analyzed. In order to facilitate the controller digital implementation, the discrete control strategy is proposed. At last, the modeling approach and control strategy is validated by both simulation and experiment.