大停电事故几乎都不是单一原因造成的，事故过程中多类稳定问题交织并相互转化，发展变化过程极为复杂，传统上单独考虑不同稳定问题的理论思路及基于离线/在线仿真、预想故障匹配的稳定分析控制体系难以应对小概率复杂事件，保障复杂大电网的安全稳定运行。为此，项目充分利用广域同步信息的更强可观性，从建立电力系统统一幅相动力学模型入手，明确幅相变量的时空关联关系及暂态过程中的“源-网-荷”相互作用机制，揭示功角稳定与电压稳定统一暂态稳定机理；构造幅相能量函数，研究稳定问题与幅相能量间的关系，进而提出广义等面积法则，形成响应驱动的稳定量化评估方法；提出具备工况自适应性的鲁棒协同控制算法。项目将统一暂态稳定理论和广域响应数据有机结合，从建模方法、机理分析、稳定评估、控制算法等方面开展研究，形成响应驱动的电力系统统一暂态稳定分析与控制理论体系，成果对于提升复杂大电网认知水平，保障电网稳定具有重要的意义。

Blackouts are rarely attributable to a single reason. During the fault, instability patterns evolve from one form to another and manifest themselves in a complicated manner with complex characteristics. The traditional stability analysis and control strategy based on study of one type of stability problem at a time using offline/online simulation against preselected contingencies could not cover all the complicated scenarios that faults may occur. Taking advantage of better observability offered by the wide-area synchronized phaser information, this project proposes a unified magnitude/phase dynamic model, and establishes the spatio-temporal relationship between the magnitude and phase variables considering the interaction among generators, network, and load during the transient process, revealing angular and voltage transient stability mechanism. This project develops the magnitude/phase energy function, based on which the relationship between stability and magnitude/phase energy is analyzed. The generalized equal area criterion is proposed with the development of a quantitative, response triggered stability assessment method and an adaptive robust coordinated control algorithm. By combining the unified transient stability theory and wide-area synchronized phaser information, the project carries out research in the following areas: modeling, mechanism analysis, stability evaluation, and control algorithm as well as development of a unified, response triggered power system transient stability analysis and control framework. Its results are of great importance to enhance understanding of large complex power grids, and guarantee their security and stability.