基于扰动跟踪Terminal滑模与多目标零动态的协调励磁控制器设计

Coordination excitation controller design based on disturbance tracking Terminal sliding mode and multi-objective zero dynamics control

针对电力系统中存在各种扰动和模型不确定性等,为了提高励磁控制的鲁棒性,并考虑机端电压限制,设计了以功角稳定和电压控制为目标的协调励磁控制器。功角稳定控制在Terminal滑模中在线跟踪扰动并进行补偿,构成扰动跟踪Terminal滑模控制,抑制一般扰动和振荡,并能抑制共振型低频振荡;同时设计了多目标零动态滑模控制,在机端电压过限或突变时投入,具有控制功角和提高机端电压性能的功能。稳定控制和电压控制协调切换完成励磁控制。仿真结果表明控制器能在各种扰动时快速稳定功角,并能抑制共振型低频振荡,同时能有效控制机端电压。

Considering various disturbances and model uncertainty in power system, a coordination excitation controller for power angle stability and terminal voltage control is designed to enhance the robustness of excitation control and take terminal voltage limit into account. Power angle stability control tracks disturbance and compensate it in Terminal sliding mode and it makes disturbance tracking Terminal sliding mode excitation control. It＇s able to suppress general disturbances, oscillations, and also resonance-type low-frequency oscillation. Meanwhile multi-objective zero dynamics sliding mode control is designed. It will be put to use when terminal voltage exceeds the limits or voltage jump occurs and it＇s able to control power angle stability and improve terminal voltage property. The excitation controller operates through coordination switch of stability control and voltage control. Simulation shows that the controller is able to provide strong damping and stabilize power angle fast during disturbances, to suppress resonance-type low-frequency oscillation, as well as to control generator terminal voltage effectively.