基于二階終端滑模優(yōu)化的電流環(huán)滑模控制

黃宴委 劉喆怡 熊少華 陳少斌

摘 要：針對永磁同步電機(jī)電流環(huán)存在參數(shù)攝動、干擾等不確定因素，提出了一種基于二階終端滑模優(yōu)化的電流滑模控制。借助常規(guī)滑模控制的設(shè)計簡單、容易實(shí)現(xiàn)等優(yōu)點(diǎn)，計算得到電機(jī)電流環(huán)的等效控制量。利用二階終端滑模設(shè)計不確定量的控制量，并引入自適應(yīng)指數(shù)趨近律抑制系統(tǒng)參數(shù)攝動和干擾等不確定量。所提出的電流環(huán)滑模控制系統(tǒng)進(jìn)行了穩(wěn)定性分析，理論上可獲得自適應(yīng)零增益切換函數(shù)控制，達(dá)到有效抑制“抖振”，具有很好的魯棒性。對仿真和實(shí)驗(yàn)波形的計算結(jié)果表明：所提出的控制方法提高了電流穩(wěn)態(tài)精度，獲得更好的調(diào)速性能，且設(shè)計簡單。

關(guān)鍵詞：永磁同步電機(jī)，電流環(huán)，滑模控制，二階終端滑模，自適應(yīng)增益

中圖分類號：TP 273 文獻(xiàn)標(biāo)志碼：A

Abstract： In order to suppress uncertainties caused by parameteric variations and disturbances， a sliding mode control （SMC） optimized by a second order terminal sliding mode control （STSMC） is derived to control current loops in a permanent magnet synchronous motor （PMSM）. The equivalent control quantity for the current loop is easy obtained by SMC. The switching control for uncertainties is deduced by STSMC integrated with an adaptive exponential function law. Moreover， the stability of STSMC system is analyzed for current loops， and the gain of the switching function in STSMC can be set small， even to be set theoretic zero. STSMC is effective to suppress the “chattering” and retains the system robustness. The comparative results of simulations and experiments indicate that the current loop control system by STSMC improves the steady state accuracy of the current with the result in a better performance of speed regulation for PMSM， and is easy to implement.

Keywords：permanent magnet synchronous motor； current loops； sliding mode control； second order terminal sliding mode； adaptive gain