本文選題：三電平逆變器 + PMSM��； 參考：《華僑大學(xué)》2016年碩士論文

【摘要】：三電平逆變器在高壓大功率交流傳動(dòng)系統(tǒng)中有著廣泛的應(yīng)用,但是由于開(kāi)關(guān)器件開(kāi)關(guān)損耗以及散熱的限制等因素,其最高開(kāi)關(guān)頻率一般只有幾百赫茲,從而導(dǎo)致脈沖寬度調(diào)制(Pulse Width Modulation,PWM)波形中諧波含量大。同時(shí),在高速列車牽引傳動(dòng)系統(tǒng)的整個(gè)速度范圍內(nèi),載波比的變化范圍非常大,如果只使用一種調(diào)制方式是無(wú)法滿足調(diào)速的要求。為了解決這些問(wèn)題,本文以三電平逆變器永磁同步電機(jī)為牽引電機(jī),采用矢量控制技術(shù),對(duì)特定次諧波消除脈沖寬度調(diào)制(Selective Harmonic Elimination of Pulse Width Modulation,SHEPWM)的多模式PWM策略進(jìn)行研究,主要有以下內(nèi)容:首先,基于兩電平SHEPWM和三電平SHEPWM的數(shù)學(xué)模型,推導(dǎo)出非線性超越方程組,通過(guò)牛頓迭代法和差分演化算法得到解的曲線。在MATLAB仿真軟件中對(duì)基于兩電平逆變器和三電平逆變器的SHEPWM方法進(jìn)行了對(duì)比分析,同時(shí)驗(yàn)證了SHEPWM消諧的效果,即N個(gè)開(kāi)關(guān)角的SHEPWM可以消除N-1個(gè)諧波。然后,研究了采用多模式調(diào)制策略時(shí),不同開(kāi)關(guān)角的SHEPWM模式之間的平滑過(guò)渡,正弦脈沖寬度調(diào)制(Sinusoidal Pulse Width Modulation,SPWM)調(diào)制與SHEPWM之間的平滑過(guò)渡。并在MATLAB/Simulink中搭建基于SHEPWM的多模式調(diào)制仿真模型,通過(guò)采用三相同時(shí)切換與分別切換相結(jié)合的方法,減小了不同PWM策略間過(guò)渡時(shí)的電流沖擊。最后,針對(duì)基于三電平逆變器的永磁同步電機(jī)控制系統(tǒng)設(shè)計(jì)了三電平變流柜和基于DSP+CPLD構(gòu)架的硬件平臺(tái),并給出了控制算法實(shí)現(xiàn)的軟件流程圖。通過(guò)實(shí)驗(yàn)驗(yàn)證了主要外設(shè)設(shè)計(jì)的有效性,并對(duì)SHEPWM算法進(jìn)行了驗(yàn)證,結(jié)果表明,硬件平臺(tái)可以實(shí)現(xiàn)相應(yīng)功能并已初步具備實(shí)現(xiàn)基于三電平逆變器的永磁同步電機(jī)多模式PWM算法的條件。
[Abstract]:Three-level inverter has been widely used in high-voltage and high-power AC drive systems. However, due to switching loss and heat dissipation of switching devices, the maximum switching frequency is generally only a few hundred hertz.Therefore, the harmonic content in pulse Width Modulation (PWM) waveform is large.At the same time, in the whole speed range of traction transmission system of high-speed train, the range of carrier ratio variation is very large, if only one modulation mode is used, it can not meet the requirements of speed regulation.In order to solve these problems, this paper studies the multi-mode PWM strategy of selective Harmonic Elimination of Pulse Width Modulation (SHEPWM) with three-level inverter permanent magnet synchronous motor (PMSM) as traction motor and vector control technology.The main contents are as follows: firstly, based on the mathematical models of two-level SHEPWM and three-level SHEPWM, the nonlinear transcendental equations are derived, and the curves of the solutions are obtained by Newton iterative method and differential evolution algorithm.In the MATLAB simulation software, the SHEPWM method based on two-level inverter and three-level inverter is compared and analyzed, and the effect of SHEPWM harmonic elimination is verified, that is, the SHEPWM with N switching angles can eliminate N-1 harmonics.Then, the smooth transition between SHEPWM modes with different switching angles, and the smooth transition between sinusoidal Pulse Width modulation and SHEPWM are studied.The simulation model of multi-mode modulation based on SHEPWM is built in MATLAB/Simulink. The method of three-phase simultaneous switching and separate switching is used to reduce the current impulse during the transition between different PWM strategies.Finally, the three-level converter cabinet and the hardware platform based on DSP CPLD are designed for the permanent magnet synchronous motor control system based on three-level inverter, and the software flow chart of the control algorithm is given.The effectiveness of the main peripheral designs is verified by experiments, and the SHEPWM algorithm is verified. The results show that,The hardware platform can realize the corresponding function and has the condition to realize the multi-mode PWM algorithm of permanent magnet synchronous motor based on three-level inverter.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM464;TM341

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 孫大南;地鐵車輛牽引電傳動(dòng)系統(tǒng)控制關(guān)鍵技術(shù)研究[D];北京交通大學(xué);2012年

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本文編號(hào)：1738039