摘要
在VSI系统中,由于死区时间、传递环节以及VSI非线性特性使实际相电压与目标相电压产生误差而导致相电流的畸变,影响了基于扩展卡尔曼滤波转速估计方法的精度,从而提出带有相电压补偿的基于扩展卡尔曼滤波算法的无传感器感应电机转速估计方法。首先对相电压进行补偿,通过简单硬件电路实时地对VSI的输出进行反馈,得到精确的补偿电压幅值。同时,利用经过滤波的励磁电流分量、转矩电流分量对相电流进行重建,准确地对电流方向进行判断,得到相电压补偿极性;再利用补偿后的相电压和相电流进行基于扩展卡尔曼滤波的转速估计。仿真和实验结果验证了带有相电压补偿的基于扩展卡尔曼滤波的转速估计结果比传统转速估计结果具有更高的精度。
Insertion of dead time,transfer links between micro control unit and voltage source inverter(VSI),non-ideal characteristics of VSI all lead to deviation between the actual output voltage and the command voltage,resulting in phase voltage deviation and reducing estimation accuracy.A speed estimation method based on EKF with phase voltage compensation was proposed.Precise compensation amplitude was calculated by actual output of the VSI as feedback with a simple hardware circuit and compensation polarity was obtained from phase current polarity by reconstructing phase current from filtered current component under M-T coordinate.Thus phase voltage compensation was conducted and then phase voltage and current after compensation was utilized to estimate the rotor speed.Simulation and experimental results show that the proposed method has better estimation accuracy than the traditional one based on EKF.
作者
王大方
李琪
张鹏
金毅
杨博文
廖江敏
WANG Da-fang;LI Qi;ZHANG Peng;JIN Yi;YANG Bo-wen;LIAO Jiang-min(2.Academy of Armored Forces Engineering,Beijing 100000,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2019年第1期35-44,共10页
Electric Machines and Control
基金
国家自然科学基金(51305457)
国家国际科技合作专项(2014DFB70120)
威海市科技发展计划(2014DXGJ02)
中央高校基本科研业务费专项资金资助(HIT.NSRIF.201705)
山东省自然科学基金(ZR2017MEE011)
关键词
感应电机
转速估计
扩展卡尔曼滤波
相电压补偿
电流极性判断
induction motors
speed estimation
extended kalman ficter
phase voltage compensation
current polarity judgment
