电工技术学报2025，Vol.40Issue(12)：3842-3856,15.DOI:10.19595/j.cnki.1000-6753.tces.240819
低开关频率下多相感应电机全阶观测器离散化方法研究
Research on Full-Order Observer Discretization Method of Multi-Phase Induction Motor at Low Switching Frequency
摘要
Abstract
The multi-phase open-winding induction motor and its adaptive H-bridge multi-phase inverter system have received extensive attention due to their advantages of small torque ripple,strong fault tolerance,and easy power capacity expansion.This paper analyzes the modeling of the multi-phase open-winding motor system and speed sensorless control technology to achieve high degrees of freedom control and low switching frequency characteristics in a twelve-phase,large-capacity,open-winding motor system.The simulation and experimental verification are conducted to enhance the operating performance of the low-switching-frequency multi-phase open-winding motor system. The twelve-phase open-winding induction motor system and its equivalent three-phase simplified model are established.The equivalent three-phase full-order observer model and its speed estimation method are presented.The full-order observer used in speed sensorless control has the advantages of low control bandwidth requirements and a wide range of observation speeds.However,the switching frequency of the H-bridge large-capacity inverter supporting the ship's multi-phase open-winding induction motor is low,which inevitably increases the digital discretization error of the full-order observer.This paper derives the full-order flux observer models based on the forward Euler method,the simplified second-order discretization method,and the proposed Adams fourth-order discretization method.Then,the steady-state error and observer stability are compared using the F-norm and pole diagram.Theoretical analysis reveals that the full-order observer,based on Adams'fourth-order discretization method,achieves the best discrete accuracy and stability of the observation system while minimizing the computational complexity of the digital control system. A simulation model and a test platform for a twelve-phase,25 kW open-winding induction motor with speed sensorless control have been developed.The results show that,compared with the forward Euler method and the simplified second-order discretization method,the observation results for speed,current,and flux based on the Adams fourth-order discretization method are almost consistent with the actual values.Through the speed sensorless closed-loop speed regulation test and load mutation test,it is further verified that the full-order observer based on Adams'fourth-order discretization method exhibits good speed regulation and load-carrying capacity,which can achieve better dynamic and steady-state performance under both extremely low and high-speed conditions.The full-order observer discretization method can provide technical support for applying speed sensorless control technology to low switching frequency multi-phase open-winding motor systems.关键词
多相开绕组感应电机/全阶观测器/离散算法/低开关频率Key words
Multi-phase open-winding induction motor/full-order observer/discretization algorithm/low switching frequency分类
动力与电气工程引用本文复制引用
胡亮灯,郭城,徐小松,罗翔宇..低开关频率下多相感应电机全阶观测器离散化方法研究[J].电工技术学报,2025,40(12):3842-3856,15.基金项目
国防科技基础加强计划资助项目(2022-JCJQ-JJ-0537). （2022-JCJQ-JJ-0537）
