基于单机无穷大母线等值和轨迹灵敏度的暂态稳定最优励磁控制

为进一步降低电力系统暂态稳定控制代价,提出通过最优控制系统快速动态装置的设定值来保证系统在故障情况下的暂态稳定性。基于单机无穷大母线等值和轨迹灵敏度法,提出暂态稳定最优励磁控制二次规划模型,通过调整发电机电压调节器参考电压设定值来控制系统的稳定性。根据单机无穷大母线等值,在暂态稳定最优励磁控制模型中引入严格的暂态稳定判据;并借助轨迹灵敏度和稳定裕度指标提高计算效率。采用稳定裕度指标后避免寻找临界稳定轨迹,从而节省大量仿真时间。在新英格兰39节点10机系统和某省级692节点138机实际系统上的仿真结果验证了所提算法的可行性和有效性。

Optimal Transient Stability Excitation Control Based on OMIB Equivalents and Trajectory Sensitivities

In order to further decrease power system transient stability control costs,system fast dynamic device set points optimal control was proposed in this paper to guarantee system transient stability under contingency.An optimal transient stability excitation control(OTSEC) quadratic model based on a one-machine-infinite-bus(OMIB) equivalent and a trajectory sensitivity method was proposed in this paper to maintain power system stability,which was used to determine the generator voltage regulator reference set points.An OMIB equivalent was used to introduce a strict transient stability criterion into the OTSEC model,and a trajectory sensitivity method and a stability margin index were proposed here to enhance computational efficiency.Since the stability margin index was adopted,the need for searching critical stable trajectories for unstable faults was avoided and hence simulation time was greatly saved.The feasibility and effectiveness of the proposed method are demonstrated and verified on the 10-machine and 39-bus New England system and a provincial 138-machine and 692-bus system.