【摘要】：永磁同步電機(jī)(Permanent Magnet Synchronous Motor, PMSM)因?yàn)榻Y(jié)構(gòu)簡(jiǎn)單,效率高等優(yōu)點(diǎn),逐漸在航空航天、數(shù)控機(jī)床等高性能調(diào)速場(chǎng)合得到了廣泛應(yīng)用。模型預(yù)測(cè)控制由于原理簡(jiǎn)單,便于處理非線性約束條件,因此具有很強(qiáng)的適用性。模型預(yù)測(cè)轉(zhuǎn)矩控制(Model Predictive Torque Control, MPTC)策略是模型預(yù)測(cè)控制在直接轉(zhuǎn)矩控制中的應(yīng)用,但是兩電平逆變器驅(qū)動(dòng)的傳統(tǒng)模型預(yù)測(cè)轉(zhuǎn)矩控制只能選擇六個(gè)固定方向上幅值恒定的電壓矢量,并且每個(gè)控制周期只有一個(gè)電壓矢量作用,存在較大的轉(zhuǎn)矩和磁鏈脈動(dòng)�；谡伎毡瓤刂频哪Ｐ皖A(yù)測(cè)轉(zhuǎn)矩控制策略雖然可以減小轉(zhuǎn)矩和磁鏈脈動(dòng),但是這種方法先選擇電壓矢量,然后再計(jì)算占空比,結(jié)合占空比后的電壓矢量不能保證是全局最優(yōu)。針對(duì)這一問(wèn)題,本文在分析電壓矢量幅值與轉(zhuǎn)矩和磁鏈增量的基礎(chǔ)上,提出了一種同時(shí)考慮轉(zhuǎn)矩和磁鏈誤差最小化的最優(yōu)占空比模型預(yù)測(cè)轉(zhuǎn)矩控制策略。該方法在選取電壓矢量時(shí),首先針對(duì)每一個(gè)電壓矢量預(yù)先計(jì)算出使得下一時(shí)刻轉(zhuǎn)矩和磁鏈與其給定值誤差最小的占空比,再通過(guò)價(jià)值函數(shù)同時(shí)選取出最優(yōu)電壓矢量及其占空比的組合,并且在占空比計(jì)算過(guò)程中同時(shí)考慮了對(duì)轉(zhuǎn)矩和磁鏈的控制。為了驗(yàn)證本文所提出的控制策略的可行性和有效性,在MALTAB/Simulink中對(duì)傳統(tǒng)模型預(yù)測(cè)轉(zhuǎn)矩控制、占空比模型預(yù)測(cè)轉(zhuǎn)矩控制和本文提出的最優(yōu)占空比模型預(yù)測(cè)轉(zhuǎn)矩控制進(jìn)行了仿真對(duì)比,最后在兩電平逆變器驅(qū)動(dòng)的永磁同步電機(jī)上進(jìn)行了實(shí)驗(yàn)驗(yàn)證。實(shí)驗(yàn)結(jié)果表明占空比MPTC和最優(yōu)占空比MPTC控制方法動(dòng)態(tài)上保持傳統(tǒng)MPTC的快速性的同時(shí),穩(wěn)態(tài)上減小了轉(zhuǎn)矩和磁鏈脈動(dòng),而且最優(yōu)占空比MPTC減小轉(zhuǎn)矩和磁鏈脈動(dòng)的效果最為明顯。
[Abstract]:PMSM (permanent Magnet synchronous Motor) (Permanent Magnet Synchronous Motor, PMSM) has been widely used in aeronautics and astronautics, numerical control machine tools and other high performance speed control occasions because of its simple structure and high efficiency. Model predictive control has strong applicability because of its simple principle and convenient handling of nonlinear constraints. Model predictive torque control (Model Predictive Torque Control, MPTC) strategy is an application of model predictive control (MPC) in direct torque control (DTC). However, the traditional model of two-level inverter drive can only select six voltage vectors with constant amplitude in a fixed direction, and each control period has only one voltage vector, which has a large torque and flux ripple. Although the torque control strategy based on duty cycle control can reduce the torque and flux ripple, this method selects the voltage vector first, then calculates the duty cycle, and the voltage vector after duty cycle can not be guaranteed to be the global optimal. In order to solve this problem, based on the analysis of voltage vector amplitude, torque and flux increment, an optimal duty cycle model predictive torque control strategy is proposed, which considers the minimization of torque and flux error simultaneously. In selecting the voltage vector, the duty cycle of the torque and flux at the next moment and the minimum error between the flux and the given value are calculated in advance for each voltage vector. The optimal voltage vector and its duty cycle are selected simultaneously by the value function, and the control of torque and flux is considered simultaneously in the duty cycle calculation. In order to verify the feasibility and effectiveness of the proposed control strategy, the traditional model predictive torque control is used in MALTAB/Simulink. The duty cycle model predictive torque control is compared with the optimal duty cycle predictive torque control proposed in this paper. Finally, the simulation results are verified on the permanent magnet synchronous motor (PMSM) driven by two-level inverter. The experimental results show that the control methods of duty cycle MPTC and optimal duty cycle MPTC dynamically maintain the rapidity of traditional MPTC, and at the same time reduce the torque and flux ripple in steady state, and the effect of the optimal duty cycle MPTC on reducing torque and flux ripple is most obvious.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM341

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