基于增量观测器的MPCC一拍滞后补偿方法研究

Research on One-step Delay Compensation Method for Model Predictive Current Control Based on Incremental Observer

模型预测控制具有概念简单、容易处理包含约束条件的多变量控制问题等优点,已经成为电力传动领域研究的热点。针对三相异步电机的连续控制集模型预测电流控制(CCS-MPCC),通过系统闭环模型研究了一拍滞后对模型预测控制的影响,并给出了基于增量观测器的滞后补偿方法。首先,介绍了三相异步电机CCS-MPCC的基本原理;其次,利用系统闭环模型分析了一拍滞后对CCS-MPCC的影响;然后,给出了增量观测器及其设计方法;最后,通过实验验证了一拍滞后及基于增量观测器的补偿方法对模型预测控制的影响。实验结果表明,增量观测器具有良好的一拍滞后补偿特性,可以明显的改善CCS-MPCC的控制性能。

Model predictive control(MPC)has several important advantages such that concepts are very intuitive and the multivariable case with constraints can be easily considered.So,MPC has become a hot research topic in electric drives.By using the CCS-MPCC as a workbench,the effect of one-step delay on MPC characteristics which investigated by system closed-loop model was focused on.At the same time,the compensation methods based on incremental observer was presented.Firstly,the basic principle of CCS-MPCC which used for three phase induction machine was introduced.Secondly,the effect of one-step delay on CCSMPCC was analyzed by using the closed-loop model of the system.Thirdly,the incremental observer and its design method were presented.Finally,the effect of one-step delay and its compensation by incremental observer on MPC performances were verified by experiments.The experimental results show that the incremental observer has a good one-step delay compensation characteristic,which can obviously improve the control performance of CCS-MPCC.