發(fā)布時(shí)間：2018-12-26 14:27

【摘要】：摘要：永磁同步電機(jī)定轉(zhuǎn)子參數(shù)變化嚴(yán)重影響電機(jī)的控制性能,因此本文對(duì)永磁同步電機(jī)進(jìn)行參數(shù)辨識(shí)及模型預(yù)測(cè)控制研究。 針對(duì)帶遺忘因子最小二乘參數(shù)辨識(shí)算法中遺忘因子的選擇問(wèn)題,提出了跟隨誤差變化的分段中值遺忘因子最小二乘辨識(shí)方法。建立了參數(shù)辨識(shí)仿真模型,并在此基礎(chǔ)上,對(duì)比分析了帶遺忘因子最小二乘法、線性時(shí)變遺忘因子最小二乘法和本文提出的分段中值遺忘因子最小二乘法這三種方法的辨識(shí)效果。仿真結(jié)果表明本文提出的方法辨識(shí)結(jié)果更為準(zhǔn)確,完成辨識(shí)的時(shí)間更短。 針對(duì)永磁同步電機(jī)的定轉(zhuǎn)子參數(shù)變化與外界負(fù)載擾動(dòng)的影響問(wèn)題,提出了一種改進(jìn)的模型預(yù)測(cè)控制算法。增加電壓前饋補(bǔ)償模塊,實(shí)現(xiàn)d、q軸電流解耦；采用一階差分增量法設(shè)計(jì)電流環(huán)和速度環(huán)的模型預(yù)測(cè)控制器；并通過(guò)設(shè)計(jì)一個(gè)性能指標(biāo)函數(shù)得到預(yù)測(cè)控制器增量表達(dá)式。建立了永磁同步電機(jī)控制系統(tǒng)仿真模型,對(duì)比分析了本文方法與PI控制器的控制效果。仿真結(jié)果表明本文提出的方法能更好地抑制電機(jī)定轉(zhuǎn)子參數(shù)變化與外界負(fù)載擾動(dòng)的影響,具有較強(qiáng)的魯棒性。
[Abstract]:Abstract: the change of stator and rotor parameters of permanent magnet synchronous motor (PMSM) seriously affects the control performance of PMSM, so the parameter identification and model predictive control of PMSM are studied in this paper. Aiming at the problem of selecting the forgetting factor in the least square parameter identification algorithm with forgetting factor, a piecewise median forgetting factor least squares identification method with error variation is proposed. The simulation model of parameter identification is established, and on this basis, the least square method with forgetting factor is compared and analyzed. The identification effect of the linear time-varying forgetting factor least square method and the piecewise median forgetting factor least square method proposed in this paper. The simulation results show that the proposed method is more accurate and the time to complete identification is shorter. An improved model predictive control algorithm is proposed to solve the problem of the change of stator and rotor parameters of permanent magnet synchronous motor (PMSM) and the influence of external load disturbance. The DC Q axis current decoupling is realized by adding voltage feedforward compensation module, the model predictive controller of current loop and speed loop is designed by first order difference increment method, and the incremental expression of predictive controller is obtained by designing a performance index function. The simulation model of permanent magnet synchronous motor control system is established, and the control effect of this method and PI controller is compared and analyzed. The simulation results show that the proposed method can better suppress the influence of stator and rotor parameters change and external load disturbance on motor, and it has strong robustness.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM341

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本文編號(hào)：2392249