LCL并网逆变器的自适应事件触发模型预测控制  

Adaptive Event-triggered Model Predictive Control for LCL Grid-connected Inverters

作　　者：王素娥[1] 张帅 郝鹏飞[1] 陈景文[1] WANG Su’e;ZHANG Shuai;HAO Pengfei;CHEN Jingwen(School of Electrical and Control Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China)

机构地区：[1]陕西科技大学电气与控制工程学院,西安710021

出　　处：《高电压技术》2023年第10期4267-4277,共11页High Voltage Engineering

基　　金：陕西省重点研发计划(2023-YBGY-304);陕西省教育厅计划(22JC023);西安市科技计划(21XJZZ003)。

摘　　要：LCL并网逆变器在采用基于事件触发机制的模型预测控制时,存在数控延迟及系统稳态性能易受运行工况变化影响等问题。为此,提出一种自适应事件触发的两步模型预测控制(adaptive event-triggered model predictive control with 2 steps,AET-MPC-2S)策略。首先,在模型预测控制环节中,该控制策略通过结合事件触发机制,筛选出合适的开关矢量进行两步预测;其次,AET-MPC引入自适应变量来监测系统的运行状态,对事件触发条件进行实时调节;最后,通过Matlab仿真和RT-LAB半实物平台进行验证。结果表明:AET-MPC-2S能够在实现延迟补偿的同时,减少两步预测的计算量,且不影响电流的跟踪效果,并能在运行工况发生变化后实时调节事件触发条件,使系统保持较好的稳态性能。论文研究可为降低LCL并网逆变器的开关频率以及改善系统的稳态性能提供参考。When predictive control by event-triggered model is adopted for LCL grid-connected inverters,the problems that there exists numerical control delay and the system’s steady-state performance is susceptible to changes in operating conditions may occur.For this reason,this paper proposes a strategy,namely,the adaptive event-triggered model predictive control with two steps(AET-MPC-2S).Firstly,in the model predictive control algorithm,the control strategy combines the event triggering mechanism to select appropriate switch vectors for two-step prediction.Secondly,AET-MPC introduces adaptive variables to monitor the operating status of the system and adjust event triggering conditions in real time.Finally,the effectiveness of AET-MPC-2S is verified through Matlab simulations and experiments conducted on the RT-LAB platform.The results show that AET-MPC-2S achieves delay compensation,reduces the computational burden of the two-step prediction,and does not compromise the accuracy of current tracking.Furthermore,AET-MPC-2S enables real-time adjustment of the event triggering conditions in response to changes in operating conditions,and thus maintains good steady-state performance of the system.The research can provide reference for reducing the switching frequency of the LCL grid-connected inverters and improving the steady-state performance of the system.

关 键 词：LCL并网逆变器 模型预测控制 多变量控制 改进的两步预测 事件触发机制 自适应变量 

分 类 号：TM464[电气工程—电器]