Mode-dependent seamless transfer control strategy of a microgrid via a small-signal stability approach
Mode-dependent seamless transfer control strategy of a microgrid via a small-signal stability approach
复制标题
通过小信号稳定性方法实现微电网的模式相关无缝传输控制策略
DOI：
10.1002/asjc.2055
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发表时间：
2019
影响因子：
2.4
通讯作者：
Wu Yanpeng
中科院分区：
文献类型：
--
作者：
Wu Ying;Guerrero Josep M;Wu Yanpeng
微电网既可以并网运行，也可以孤岛运行，是增强分布式可再生能源资源整合的有效解决方案。为了使系统变量的跳变减小到可接受的范围内，以保证系统在多种工作模式下具有良好的暂态性能和电能质量，无缝传输是需要考虑的关键问题。由于两种运行模式有不同的多个平衡点，本文将每一种运行模式的动力学重新建模为一个子系统，所有变量都需要同步。基于小信号稳定性方法，分别对两种工作模式在状态空间形式下的不同平衡点进行了线性化。为了降低统一控制器的保守性，引入了相对Lyapunov函数的概念，导出了多段Lyapunov方法，并设计了鲁棒反馈模式相关切换控制器，使两种模式的偏差能量都收敛于零点，实现了平滑传递。为了快速检测交换信号，引入了稀疏通信网络，利用低带宽通信链路将交换信号广播到各个分布式控制器。最后，在SIMULINK中搭建了两个微电网测试系统，验证了所提出的无缝传输控制策略的可行性和有效性。
A microgrid is an effective solution to enhance the integration of distributed renewable energy resources, which can operate both in grid connected mode and islanded mode. In order to reduce the jumps of the system variables within acceptable limits to ensure the system has good transient performance and power quality in multiple operating modes, seamless transfer is the key problem to be considered. In this paper, due to the different multiple equilibrium points for the two operating modes, the dynamics of every operating mode re modeled as a subsystem with all the variables that are needed to be synchronized. Linearization is carried out respectively for the two operation modes on the different equilibriums in a state‐space form based on the small‐signal stability method. To reduce the conservatism of the unified controller, the concept of the relative Lyapunov function is introduced to derive a multiple segmental Lyapunov method and a robust feedback mode‐dependent switching controller is designed to achieve smooth transfer by making the deviation energy of the two modes both converge to the zero point. To rapidly detect the switching signal, a sparse communication network is introduced by the use of low bandwidth communication links to broadcast the switching signal to each distributed controller. Finally, two microgrid test systems were built in SIMULINK to show the feasibility and effectiveness of the proposed seamless transfer control strategies.