In order to avoid the complexity of obtaining the sensitivity in the usual optimal flow with small signal stability, which is easily result from the mere consideration of active power output optimization or the change of element model, a new model is proposed to improve the small-signal stability of the system by constraining the perturbation trajectory curve. Based on the time-domain simulation method, a power flow optimization model with small-signal trajectory constraint is established by extracting the damping ratio of the perturbation trajectory and forming constraints. The optimization calculation results of Western Systems Coordinating Council 3-generator 9-node system and China Electric Power Research Institute 6-generator 22-node system prove that the corresponding minimum damping ratio of the system increases with the increase of the constraint value of approximate damping ratio, which demonstrates the effectiveness of the model.

为了避免通常只考虑有功功率输出优化或更改元件模型而容易导致的，在具有小信号稳定性的通常最佳流中获得灵敏度的复杂性，提出了一种新模型来改进小功率滤波器的灵敏度。通过限制摄动轨迹曲线来确定系统的信号稳定性。基于时域仿真方法，通过提取扰动轨迹的阻尼比并形成约束条件，建立了具有小信号轨迹约束的潮流优化模型。