基于修正轨迹灵敏度的模型预测长期电压稳定控制

Model Predictive Control for Long-term Voltage Stability Based on Corrected Trajectory Sensitivities

针对现有基于轨迹灵敏度的模型预测紧急电压控制方法中存在的不足,引入指数型参考轨迹。考虑了当控制增量施加于系统后,初始状态改变对故障后各采样时刻轨迹灵敏度的影响。根据动态电压全过程仿真估算控制增量,对故障后各采样时刻的轨迹灵敏度进行修正,使修正后的轨迹灵敏度与实际的轨迹灵敏度趋于一致。为了满足紧急情况下快速控制的要求,制定了考虑控制代价的控制元件动态选取策略。新英格兰10机39节点系统的仿真结果验证了所采用的轨迹灵敏度修正方法和控制元件选取策略的可行性和有效性。

In order to overcome the shortages of model predictive emergency voltage control method which is based on the existing trajectory sensitivities,exponential reference trajectory is introduced.This paper considers the effects of initial state changes on trajectory sensitivities at the post-fault sampling points.The control increment is estimated according to full process dynamic voltage simulation and then the trajectory sensitivities are corrected at the post-fault sampling points.Thus the corrected trajectory sensitivities are close to the actual trajectory sensitivities.Furthermore,the dynamic selecting strategy of control components considering the control cost is formulated in order to satisfy fast control requirements under emergency condition.Results on New England 10-machine 39-bus system demonstrate the feasibility and effectiveness of the corrected trajectory sensitivity method and selecting strategy of control components.