基于二阶变增益滑模的感应电机电压模型磁链观测器
Voltage Model Rotor Flux Observer of Induction Motor Based on Second-order Variable Gain Sliding Mode
王天擎 1王勃 1于泳 1徐殿国1
作者信息
- 1. 哈尔滨工业大学电气工程及自动化学院,黑龙江省 哈尔滨市 150001
- 折叠
摘要
针对无速度传感器感应电机驱动系统,基于二阶滑模的电压模型磁链观测器可以有效提升传统开环电压模型观测器的转速估计鲁棒性.然而,现有二阶滑模电压模型观测器仍然存在以下 2 个问题:1)滑模观测器常数增益与可变稳定性条件间的不匹配问题;2)由于存在直流偏置,需要采用非理想积分器来估计转子磁链.针对这2个问题,该文提出相应解决方案:1)改进二阶滑模观测器结构,并根据稳定性条件设计可变增益,以同时实现宽调速范围内的观测器稳定性与抖振抑制;2)根据滑模观测器的输出,设计一种带直流偏置补偿的积分器,以提升磁链估计精确度.最后,在 3.7 kW的感应电机实验装置上进行对比实验,证明所提方法有效性.
Abstract
For the sensorless induction motor(IM)drive system,the second-order sliding-mode-based(SOSM)voltage model observer can effectively improve the robustness of speed estimation compared with the conventional open-loop voltage model observer.However,the existing SOSM-based voltage model observer still suffers from the problems of the following two aspects:1)the mismatch problem between the fixed-value of SOSM observer gains and the variable stability condition;2)the nonideal integrator problem due to the existence of dc offset.To cope with these two problems,this paper proposes the corresponding solutions:1)to achieve wide-speed stability and chattering suppression,the SOSM observer structure is modified,and a variable gain is designed according to the stability condition;2)to improve the accuracy of rotor flux estimation,an integrator with DC offset compensation is proposed based on the output of sliding-mode observer.Finally,the effectiveness of the proposed method is verified by the contrast experiments carried out on a 3.7 kW IM experimental setup.
关键词
感应电机/无速度传感器控制/电压模型观测器/滑模观测器/直流偏置补偿Key words
induction motor(IM)/sensorless control/voltage model observer/sliding-mode observer/DC offset compensation引用本文复制引用
基金项目
国家自然科学基金(52177030)
黑龙江省自然科学基金(YQ2020E018)
台达电力电子科教发展计划(DREG2021007)
出版年
2024
国家科技期刊平台
NSTL
万方数据