實(shí)現(xiàn)高性能直接轉(zhuǎn)矩控制系統(tǒng)的重要環(huán)節(jié)是準(zhǔn)確地觀測異步電機(jī)的定子磁鏈。本文
將一種新型的速度自適應(yīng)磁鏈閉環(huán)觀測器,應(yīng)用于直接轉(zhuǎn)矩控制系統(tǒng)中,取代了傳統(tǒng)的積分
器,理論證明該系統(tǒng)是超穩(wěn)定系統(tǒng)。仿真與實(shí)驗(yàn)表明,該方案對電機(jī)磁鏈的觀測精度高,對電機(jī)參數(shù)的魯棒性好,同時(shí)基于磁鏈觀測器所設(shè)計(jì)的速度自適應(yīng)辨識方案準(zhǔn)確性好,收斂速度快,使系統(tǒng)在較低轉(zhuǎn)速下仍能保持優(yōu)良的性能。本系統(tǒng)針對111kW 異步電機(jī),采用數(shù)字信號處理器DSP( TMS320C32) 進(jìn)行了數(shù)字化實(shí)現(xiàn),實(shí)時(shí)控制軟件是采用C 和匯編語言混合編程實(shí)現(xiàn)的。
關(guān)鍵詞:異步電機(jī);直接轉(zhuǎn)矩控制;自適應(yīng)系統(tǒng);無速度傳感器;磁鏈觀測器
Abstract :A speed adaptive flux linkage observer for induction motor is proposed to replace the classical simple integrator in the direct torque cont rol system. The result system is verified to be hyperstable. Simulation and experimentation show that the adaptive observer gives high precision estimation of stator flux and the motor speed ,especially at low speed ,This approach has been implemented on a digital signal processor ( TMS320. 32) in an 111kW drive.
Key words :induction machine ;direct torque cont rol ;adaptive system ;sorisorlass flux ;observer