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作 者:许伟奇 龚立娇[1] 刘晨 郭孟宇 XU Weiqi;GONG Lijiao;LIU Chen;GUO Mengyu(College of Mechanical and Electrical Engineering,Shihezi University,Shihezi Xinjiang 832000,China)
机构地区:[1]石河子大学机械电气工程学院,新疆石河子832000
出 处:《微电机》2023年第4期73-79,95,共8页Micromotors
基 金:国家自然科学基金项目(51867021)。
摘 要:针对O-Z源逆变器驱动永磁同步电机(PMSM)控制系统,在两相旋转坐标系下,提出一种改进型的有限状态控制集模型预测电流控制(FCS-MPC)策略。首先,结合变压器特点和ZSI拓扑结构,设计一种新型O-Z源逆变器(O-ZSI),并利用状态空间平均法建立O-ZSI的动态数学模型;其次,根据O-ZSI侧电容电压闭环以及PMSM系统输出功率前补偿来获得变压器激磁电感电流参考值,其与激磁电感预测电流值构建代价目标函数用来判断是否选取直通(ST)工作状态模式,以实现对O-ZSI直流侧的升压控制;然后,在O-ZSI处于非直通(NST)工作状态模式下,通过PMSM系统的定子电流预测方程来获得O-ZSI交流侧定子电压参考值,并与逆变器的8种开关状态所对应基本定子电压构建含有激磁电感电流项的代价目标函数,选择最佳开关状态来控制PMSM,从而提高PMSM系统的控制性能以及降低在线运算量;最后,仿真结果表明,本文所提控制策略不仅能实现对O-Z源逆变器的升压,而且能使O-ZSI驱动PMSM可靠稳定运行,同时系统具有良好稳态、动态性能。In this paper,a finite state control set model predictive control(FCS-MPC)strategy was proposed for the permanent magnet synchronous motor(PMSM)drive of O-Z-source inverter in the two-phase rotation coordinate system.Firstly,Combining with the transformer characteristics and Z-source inverter topology structure,a new O-Z source inverter(O-ZSI)was designed,and the dynamic mathematical model of O-ZSI was established using the state-space averaging method.Secondly,the reference value of excitation inductance current of the transformer was obtained by controlling the capacitor voltage of the O-Z-source inverter,and combining with the mechanical power feed-forward of the PMSM system.The cost objective function was constructed with the excitation inductance predicted current value to determine whether the straight-through(ST)or non-straight-through(NST)working state mode,in order to realize the boost control of DC side of O-ZSI.Then,when the O-ZSI was in non-through(NST)working state mode,the stator voltage reference value of O-ZSI AC side was obtained by the stator current prediction equation of the PMSM system,and cost objective function was constructed with excitation inductance current term by the basic stator voltage in the 8 switching states.The best switching state was selected to control the PMSM,so as to improve the control performance of the PMSM system and reduce the online operation amount.Finally,the simulation results show that the proposed control strategy could not only realize boost control of the O-Z source inverter,but also could make the O-ZSI drive PMSM run reliably and stably.The system had good steady-state and dynamic performance.
关 键 词:O-Z源逆变器 永磁同步电机 有限状态控制集模型预测电流控制 改进型代价目标函数
分 类 号:TM351[电气工程—电机] TM341[自动化与计算机技术—检测技术与自动化装置] TP273[自动化与计算机技术—控制科学与工程]
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