基于事件触发的互联电网负荷频率模型预测输出反馈控制

Event-Triggered Load Frequency Model Predictive Output Feedback Control of Interconnected Grid

开放式通信环境不可避免地会导致通信延迟现象的产生,针对多区域负荷频率控制系统提出了基于事件触发的模型预测输出反馈控制方案。模型预测控制器通过延迟通信网络交换预测输入序列,构造Luenberger型观测器以提供传输到本地控制器的状态估计。此外,通过比较实际状态观测值与模型输出反馈控制器中使用的估计值之间的偏差来设计事件触发条件,扩展最大允许的时间间隔,从而减少通信资源的利用。最后,对四区域负荷频率控制系统进行仿真研究,结果表明在具有时变延迟和随机分组丢失的非理想通信网络中,所提出的方法能够提高系统的控制性能,并减少网络信息传输量。

The open communication environment inevitably leads to the generation of communication delay in load frequency control.This paper offers an event-triggered model predictive output feedback control scheme for multi-region load frequency control systems.Model predictive controller exchanges predictive input sequences through a delayed communication network to construct a Luenberger-type observer to provide state estimates for transmission to the local controller.In addition,event trigger conditions are developed by comparing the deviation betw een the actual state observations and the estimated values used in the model output feedback controller,extending the maximum allow able time interval,thereby reducing the utilization of communication resources.Finally,the simulation study of the four-area load frequency control system shows that the proposed method can improve the control performance of the system and reduce the number of network information transmission in non-ideal communication netw orks with time-varying delay.