發(fā)布時(shí)間：2018-12-11 02:25

【摘要】：隨著電力電子技術(shù)及器件不斷發(fā)展,變頻驅(qū)動(dòng)被廣泛應(yīng)用于新能源發(fā)電、高速列車牽引傳動(dòng)和許多交直流傳動(dòng)系統(tǒng)中。由于變頻器的輸出電壓存在高頻的共模電壓,在電機(jī)雜散電容的耦合作用下,在電機(jī)軸上感應(yīng)出軸電壓,繼而引發(fā)軸電流,造成軸承的電腐蝕,嚴(yán)重危害變頻驅(qū)動(dòng)系統(tǒng)的安全運(yùn)行。因此,研究變頻供電系統(tǒng)中的軸電流產(chǎn)生機(jī)理,提出有效地抑制方法,對(duì)提高系統(tǒng)運(yùn)行的可靠性具有重要的意義。 本文首先分析了軸電流的產(chǎn)生機(jī)理,介紹了軸電流的分類,測(cè)試方法以及抑制方案的研究現(xiàn)狀,指出在目前分析中存在的問(wèn)題。 然后針對(duì)變頻驅(qū)動(dòng)系統(tǒng)共模電壓的產(chǎn)生以及影響因素展開(kāi)研究。建立了SVPWM變頻驅(qū)動(dòng)系統(tǒng)共模電壓分析模型,采用MATLAB仿真分析了不同的IGBT死區(qū)時(shí)間、IGBT和二極管的管壓降、IGBT下降沿時(shí)間對(duì)共模電壓的影響。分析結(jié)果表明IGBT死區(qū)時(shí)間對(duì)共模電壓的峰值和有效值影響不大,但是隨著死區(qū)時(shí)間的增加,共模電壓在載波頻率處的分量幅值不斷增加。IGBT和二極管的管壓降、IGBT下降沿時(shí)間對(duì)共模電壓則影響較小。 針對(duì)變頻驅(qū)動(dòng)系統(tǒng)交流電機(jī)的共模電壓、軸電壓和軸電流進(jìn)行了實(shí)驗(yàn)測(cè)試�？疾炝瞬煌乃绤^(qū)時(shí)間、載波頻率、調(diào)制波頻率下共模電壓的變化,實(shí)驗(yàn)結(jié)果與仿真結(jié)果一致。變頻器的上述參數(shù)對(duì)軸電壓和軸電流的影響也較小。 研究分析了基于共模變壓器的低通濾波器,給出RLC網(wǎng)絡(luò)和共模變壓器各元件的定值計(jì)算方法。利用變頻器實(shí)驗(yàn)平臺(tái),證明低通濾波器對(duì)共模電壓、軸電壓的抑制作用。 最后搭建了變頻器-異步電機(jī)實(shí)驗(yàn)平臺(tái),介紹了變頻器的硬件和軟件設(shè)計(jì)。給出了共模電壓、軸電壓和軸電流的測(cè)量方案。
[Abstract]:With the continuous development of power electronics technology and devices, frequency conversion drive is widely used in new energy generation, high-speed train traction transmission and many AC / DC transmission systems. Because the output voltage of frequency converter has high frequency common-mode voltage, under the coupling action of stray capacitance of motor, the shaft voltage is induced on the motor shaft, and then the shaft current is induced, which results in the electric corrosion of the bearing. It seriously endangers the safe operation of frequency conversion drive system. Therefore, it is of great significance to study the mechanism of axial current generation in frequency conversion power supply system and to put forward effective suppression methods to improve the reliability of the system. In this paper, the generation mechanism of axial current is analyzed, the classification of axial current, the testing method and the research status of suppression scheme are introduced, and the existing problems in the analysis are pointed out. Then, the generation of common-mode voltage and its influencing factors are studied. A common-mode voltage analysis model of SVPWM variable-frequency drive system is established. The influence of different IGBT dead-time, IGBT and diode voltage drop and IGBT drop time on common-mode voltage is analyzed by MATLAB simulation. The results show that the dead time of IGBT has little effect on the peak and effective value of common-mode voltage, but with the increase of dead-time, the amplitude of common-mode voltage at carrier frequency increases continuously. The drop time of IGBT has little effect on common-mode voltage. The common mode voltage, shaft voltage and shaft current of AC motor in frequency conversion drive system are tested experimentally. The changes of common mode voltage at different dead-time, carrier frequency and modulation frequency are investigated. The experimental results are in agreement with the simulation results. The influence of the above parameters on the shaft voltage and current is also small. The low-pass filter based on common-mode transformer is studied and analyzed. The calculation method of RLC network and each component of common-mode transformer is given. The suppression effect of low pass filter on common-mode voltage and axis voltage is proved by using inverter experimental platform. Finally, the inverter-asynchronous motor experimental platform is built, and the hardware and software design of the inverter is introduced. The measurement scheme of common-mode voltage, axial voltage and axial current is given.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM34

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