交直流混合微电网微元建模与控制

随着直流负荷的增多，传统的交流微电网已经不能满足系统负载多样性及经济性等方面的需求，交直流混合微电网逐步成为研究热点和难点。仿真研究中，分布式发电(Distributed Generation，DG)的随机性、时变性和非线性化特性，使得混合微电网中DG的建模和算法实现比较困难，DG与储能之间的协调控制亦是一个难题。为此，基于实际工程需求搭建了一种包含直流大电网的交直流混合微电网的系统结构，提出了相应元件的物理模型与控制策略，并在仿真平台下着重模拟了各微元在不同工况下的协同运行。仿真结果表明，所提出的交直流混合微电网结构合理，各元件的控制策略和性能良好，且整个系统具有较快的响应速度，很好地满足了系统安全稳定性要求。

Modeling & control of hybrid AC/DC micro-grid micro components

With the increasing of DC loads, the traditional AC micro-grids can not meet the demands of system load diversity and economy. Hybrid AC/DC micro-grid gradually becomes a research hotspot. In the simulation study, the random, time-varying and nonlinear characteristics of the Distributed Generation (DG) make the DG modeling, algorithm realization and the coordination and cooperation between DG and energy storage relatively complex in hybrid micro-grid. Based on engineering application requirements, a hybrid AC/DC micro-grid system containing the DC distribution grid is built. Furthermore, the physical models and control strategies of the corresponding micro components are proposed. Finally, this paper mainly focuses on the simulation of micro components under different working conditions. The simulation results show that the proposed hybrid AC/DC micro-grid structure is reasonable, and the control strategies and performance of the components are good. The whole system has fast response speed, and can well satisfy the requirements of system security and stability.