考慮總漏感隨頻率變化的異步電機(jī)參數(shù)離線辨識(shí)算法

夏超英 谷海青 寇麗萍

摘要：針對(duì)電機(jī)轉(zhuǎn)子的鼠籠結(jié)構(gòu)會(huì)導(dǎo)致總漏感隨電流頻率的不同而發(fā)生變化給激磁電感和轉(zhuǎn)子電阻的測(cè)量帶來(lái)偏差的問(wèn)題，提出了一種離線辨識(shí)電機(jī)參數(shù)的算法。采用直流實(shí)驗(yàn)結(jié)合最小二乘法辨識(shí)定子電阻，采用低頻交流實(shí)驗(yàn)辨識(shí)激磁電感和轉(zhuǎn)子電阻，且激磁電感和轉(zhuǎn)子電阻的辨識(shí)無(wú)需電機(jī)總漏感參數(shù)，從而消除了轉(zhuǎn)子漏感參數(shù)變化給辨識(shí)帶來(lái)的影響。另外，辨識(shí)算法辨識(shí)逆變器的非線性壓降模型并對(duì)逆變器壓降進(jìn)行補(bǔ)償以提高算法精度，激磁電感的辨識(shí)在不同激磁水平下進(jìn)行以得到電機(jī)的激磁曲線。在TMS320F28035實(shí)驗(yàn)平臺(tái)上實(shí)現(xiàn)辨識(shí)算法，驗(yàn)證了算法的辨識(shí)精度。

關(guān)鍵詞：異步電機(jī)；鼠籠結(jié)構(gòu)；逆變器非線性壓降模型；激磁曲線

中圖分類號(hào)：TM 343 文獻(xiàn)標(biāo)志碼：A

Abstract：In order to analyze the leakage inductance varying with current frequency because of the deep bar effect in squirrel-caged rotor that leads to the measured deviation of magnetizing inductance and rotor resistance， an offline parameter estimation algorithm for induction motors is proposed. Stator resistance is measured through DC test with the least square method while magnetizing inductance and rotor resistance are measured through low-frequency AC test. The proposed method eliminates the influences result from leakage inductance variation by identifying the magnetizing inductance and rotor resistance without the requirement of leakage inductance. Furthermore， the proposed algorithm identifies the nonlinear voltage drop on inverter and compensates for the voltage drop on inverter automatically to ensure the estimation precision. The magnetizing curve of induction motor is also obtained by estimating the magnetizing inductance under different levels of magnetizing. The effectiveness of the proposed estimation algorithm is validated on the platform of TMS320F28035.

Keywords：induction motor ； squirrel cage； nonlinear voltage drop on inverter； magnetizing curve