Distributed Active Support from Photovoltaics via State-Disturbance Observation and Dynamic Surface Consensus for Dynamic Frequency Stability Under Source-Load Asymmetry. - Yichen Zhou; Yihe Gao; Yujia Tang; Yifei Liu; Liang Tu; Yifei Zhang; Yuyan Liu; Xiaoqin Zhang; Jiawei Yu; Rui Cao (Symmetry, 2025)