本文選題：新型雙三電平變換器 + 控制策略的改進(jìn)��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：多電平變換器作為重要的電力電子設(shè)備,在能源節(jié)約、新能源開發(fā)、電力機(jī)車牽引等方面發(fā)揮著重要的作用。隨著我國工業(yè)的發(fā)展,對多電平變換器的需求也更加多元化,要求其發(fā)揮的作用也更加多樣。多電平變換器對我國產(chǎn)業(yè)的轉(zhuǎn)型、新型產(chǎn)業(yè)的發(fā)展也將起到促進(jìn)作用。傳統(tǒng)的多電平變換器由于其拓?fù)浣Y(jié)構(gòu)的限制、控制方法的約束,發(fā)揮的作用也受到限制。對傳統(tǒng)多電平變換器拓?fù)涞母倪M(jìn)、新型拓?fù)涞拈_發(fā),目前國內(nèi)外做了很多的研究。新型雙三電平變換器比傳統(tǒng)多電平變換器有著其特有的優(yōu)勢,本文以此為基礎(chǔ)做了大量的研究。首先,介紹了新型雙三電平變換器的拓?fù)浣Y(jié)構(gòu),詳細(xì)分析了其工作原理和開關(guān)狀態(tài),確定了雙三電平變換器整流側(cè)的數(shù)學(xué)模型。介紹了三種常用的調(diào)制策略并分析其各自的特點(diǎn),新型雙三電平變換器采用簡化的電壓空間矢量PWM控制技術(shù)作為其調(diào)制策略,節(jié)省了程序運(yùn)行的時(shí)間。介紹了新型雙三電平變換器的懸浮電容預(yù)充電控制,有效減小了電容預(yù)充電時(shí)電流對拓?fù)淦骷臎_擊。其次,針對新型雙三電平變換器初始控制策略在其工作運(yùn)行時(shí)存在的問題進(jìn)行了改進(jìn)。改進(jìn)控制策略I運(yùn)用整流側(cè)的開關(guān)冗余對開關(guān)狀態(tài)進(jìn)行調(diào)整,其有效減小了不可控區(qū)的面積,但在實(shí)驗(yàn)平臺(tái)上實(shí)現(xiàn)的程序較復(fù)雜。改進(jìn)控制策略II在進(jìn)行占空比計(jì)算時(shí)根據(jù)整流側(cè)和逆變側(cè)的工作情況進(jìn)行更合理的分配,在實(shí)驗(yàn)平臺(tái)上實(shí)現(xiàn)較容易一些。通過仿真驗(yàn)證了兩種改進(jìn)控制策略較初始控制策略的控制效果更好。再次,針對新型雙三電平變換器的改進(jìn)控制策略在調(diào)壓調(diào)頻運(yùn)行時(shí)電網(wǎng)側(cè)電流幅值波動(dòng)的問題,提出解決措施。一方面通過分析可知,當(dāng)逆變側(cè)調(diào)壓調(diào)頻工作且調(diào)制度滿足1-mA_rec?mA_inv時(shí),不存在不可控區(qū),通過減小整流側(cè)調(diào)制度mA_rec或逆變側(cè)調(diào)制度mA_inv都可以減小不可控區(qū)。另一方面通過相內(nèi)電容電壓波動(dòng)相抵消的方法可以較好的解決電網(wǎng)側(cè)電流幅值波動(dòng)的問題。通過仿真分析驗(yàn)證了這兩種控制方法的正確性和有效性。最后,通過搭建實(shí)驗(yàn)平臺(tái),進(jìn)行系統(tǒng)軟件的設(shè)計(jì),把改進(jìn)的控制策略在實(shí)驗(yàn)平臺(tái)上進(jìn)行調(diào)試運(yùn)行,獲得實(shí)驗(yàn)波形。通過對實(shí)驗(yàn)結(jié)果的分析可知,改進(jìn)的控制策略在實(shí)驗(yàn)平臺(tái)上運(yùn)行效果較好。
[Abstract]:As an important power electronic equipment, multilevel converter plays an important role in energy saving, new energy development, electric locomotive traction and so on. With the development of industry in China, the demand for multilevel converters is more diversified, and the role of multilevel converters is more diverse. Multilevel converters will promote the industrial transformation and the development of new industries in China. Traditional multilevel converters are restricted by their topology and control methods. Many researches have been done at home and abroad on the improvement of traditional multilevel converter topology and the development of new topology. Compared with the traditional multilevel converters, the new two-three-level converters have their unique advantages. Based on this, a lot of research has been done in this paper. Firstly, the topology of a new type of bi-three-level converter is introduced, its working principle and switching state are analyzed in detail, and the mathematical model of the rectifier side of the bi-three-level converter is determined. Three common modulation strategies are introduced and their respective characteristics are analyzed. A simplified voltage space vector PWM control technique is used as the modulation strategy for a new type of two-level three-level converter, which saves the running time of the program. In this paper, the levitation capacitor precharge control of a novel two-three-level converter is introduced, which effectively reduces the impact of the current on the topology device during the capacitor precharging. Secondly, the problems existing in the initial control strategy of the new two-three-level converter are improved. The improved control strategy I uses the switching redundancy of the rectifier side to adjust the switching state, which effectively reduces the area of the uncontrollable region, but the program implemented on the experimental platform is more complex. When the duty cycle is calculated, the improved control strategy II is more reasonably distributed according to the working conditions of the rectifier side and the inverter side, and it is easier to implement on the experimental platform. The simulation results show that the two improved control strategies are more effective than the initial control strategies. Thirdly, to solve the problem of the amplitude fluctuation of the current in the power network side of the new dual-three-level converter when the voltage modulation and frequency modulation operation is improved, the solution is put forward. On the one hand, it can be seen that there is no uncontrollable region when the inverter side voltage modulation works and the modulation system meets the 1-mA_rec?mA_inv, and the uncontrollable region can be reduced by reducing the rectifier side modulation mA_rec or the inverter side modulation mA_inv. On the other hand, the fluctuation of current amplitude in the power grid can be solved better by the method of compensating the fluctuation of the voltage fluctuation of the capacitor in the phase. The correctness and effectiveness of the two control methods are verified by simulation analysis. Finally, by setting up the experimental platform and designing the system software, the improved control strategy is debugged and run on the experimental platform, and the experimental waveform is obtained. Through the analysis of the experimental results, it can be seen that the improved control strategy works well on the experimental platform.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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本文編號(hào)：1995313