基于动态量化的电力系统事件触发负荷频率控制

Event-triggered load frequency control for power system based on dynamic quantization

针对新能源高比例并网以及由此产生的二次调频通信负荷增加问题,为了节约网络资源,将动态量化技术引入网络控制的电力系统中,应用事件触发负荷频率控制(LFC)方法,通过基于观测器的输出反馈控制器,实现了LFC系统输入到状态稳定.根据系统状态和动态量化参数,在反馈通道中设计加入指数衰减项的事件触发机制,在前向通道中设计加入状态模拟项的事件触发机制.建立基于量化控制的事件触发LFC系统动态模型,在有界负荷扰动下得到闭环系统输入到状态稳定的条件,排除了Zeno现象.通过仿真实验验证了提出方法的有效性.

The dynamic quantization technology was introduced into the network-controlled power system and the event-triggered load frequency control(LFC)method was applied to save the network resources aiming at the high proportion of new energy connected to the grid and the increasing communication load of secondary frequency modulation.The input-to-state stability of LFC system was realized by observer-based output feedback controller.An event-triggered mechanism with exponential decay term was designed for the feedback channel,and an eventtriggered mechanism with state simulation term was designed for the forward channel according to the system state and dynamic quantization parameters.A dynamic model of event-triggered LFC system based on quantization communication was established.The condition of closed-loop system input-to-state stability was obtained under the bounded load disturbance.Zeno phenomenon was eliminated.The effectiveness of the proposed method was verified by simulation.