机组惯量对暂态功角稳定性影响的复杂性

随着能源转型的推进，风电及光伏发电大规模入网引起的电力系统惯量水平降低对暂态功角稳定性的影响成为业界关注的热点。从电网送、受端的视角来界别机组惯量对暂态功角稳定性的定性影响，并不符合问题的本质。文中基于扩展等面积准则(EEAC)，分析互补两群等值惯量的变化对主导映象系统暂态稳定裕度的影响。由于故障场景对两群映象系统暂态潮流的不同影响，以及上述两种影响的交互作用，造成机组惯量对暂态功角稳定性影响的复杂性。通过对两机哈密顿系统的解析分析及数值仿真，讨论了其规律。

Complexity of Influence of Generator Inertia on Transient Angle Stability

With the advancement of energy transition, wide concern has been aroused for the influence of the declining inertia of the power system on the transient angle stability due to the large-scale wind power and photovoltaic power generation connected to the power grid. It does not conform to the nature of the problem when the qualitative influence of the generator inertia on the transient angle stability is analyzed from the perspective of the sending and receiving subsystems of the power grid. Instead, based on extended equal area criterion(EEAC), the paper analyzes the influence of the change in the equivalent inertia of the complementary-cluster on the transient stability margin of the dominant image system. Due to the different impacts of the fault scenarios on the transient flow of the complementary-cluster image system and the interaction of the above two effects, the complexity of the influence of the generator inertia on the transient angle stability is caused. The law is discussed through the analytical analysis and numerical simulation based on the two-machine Hamiltonian system.