交直流混合微电网是智能电网高效接纳分布式电源与负荷的重要途径，然而其内部网架结构薄弱、电力电子化特征凸显，导致宽频带振荡问题频发。尤其电力电子变换装备控制“黑箱化”使得交直流混合微电网小扰动建模困难，系统模型缺失导致交直流混合微电网的宽频带振荡分析及抑制面临挑战。对此，本项目拟研究三个方面的内容：1）交直流混合微电网的宽频带阻抗辨识建模方法；2）交直流混合微电网的宽频带振荡机理及其稳定性量化分析方法；3）交直流混合微电网的自适应宽频带振荡抑制方法。期望解决电力电子变换装备控制“黑箱化”所带来的阻抗建模难题，揭示交直流混合微电网宽频带振荡的产生机理，并取得宽频带振荡的快速识别技术和自适应抑制方法等创新性成果。项目将推动微电网小扰动稳定性问题的基础理论研究，为我国新能源就地消纳与交直流混合微电网的安全稳定运行提供理论和技术支撑。

The hybrid AC/DC microgrid is an important way for smart grids to efficiently accept distributed power sources and loads. However, its weak grid structure and prominent power electronics characteristics lead to frequent wide-bandwidth oscillation problems. In particular, the control “black box” of power electronics devices makes small-disturbance modeling of hybrid AC/DC microgrids difficult. The lack of system models leads to challenges in the analysis and suppression of wide-bandwidth oscillation for hybrid AC/DC microgrids. Aiming at this problem, the project will study the following three aspects: 1) the wide-bandwidth impedance identification modeling method of hybrid AC/DC microgrids; 2) the wide-bandwidth oscillation mechanism and stability quantitative analysis method of hybrid AC/DC microgrids; 3) the adaptive wide-bandwidth oscillation suppression method of hybrid AC/DC microgrids. It is expected to solve the impedance modeling difficulties brought by the control “black box” of power electronics devices, reveal the wide-bandwidth oscillation mechanism of hybrid AC/DC microgrids, and obtain innovative achievements such as fast identification technology and adaptive suppression methods of the wide-bandwidth oscillation. The project will promote the basic theoretical research of small-disturbance stability problems in microgrids, and provide a theoretical and technical support for renewable energy local consumption and stable operation of hybrid AC/DC microgrids in China.