【摘要】：大功率電力電子設備廣泛應用于電力、交通等許多領域,多電平拓撲結構結合新型大容量開關器件、優(yōu)良的控制方法是大功率電力電子設備的發(fā)展方向。其中,二極管中點鉗位(Neutral-Point Clamped)型三電平逆變器由于其較為簡單的結構和控制、較高的性價比,成為目前應用較廣的多電平變換器之一。文章首先介紹幾種不同拓撲結構的多電平變換器的研究現(xiàn)狀以及研究熱點;隨后詳細分析三電平的不同的空間矢量調制算法的優(yōu)劣。與兩電平相比,三電平擁有更多的矢量,實現(xiàn)SVPWM的途徑隨之增多,何種實現(xiàn)方法準確度高、計算量小、處理速度快、占用處理芯片內存小等問題值得深入分析;本文研究對象為地鐵輔助變流器,因此對輸出波形質量要求很高,需要具備很高的穩(wěn)態(tài)精度,很好的動態(tài)性能,要求在頻繁的突加、突減負載時,系統(tǒng)仍然能夠穩(wěn)定運行。針對該要求,本文提出一種基于離散域的PI+狀態(tài)反饋的控制策略;針對離散域的負載電流前饋解耦通道復雜難求,本文詳細分析控制器的作用機理,據此提出一種新型求解負載電流前饋傳遞函數(shù)的方法,仿真和實驗結果證明該控制方法不僅使系統(tǒng)穩(wěn)態(tài)精度高,而且動態(tài)性能也能滿足要求。最后根據NPC型三相三電平逆變器帶異步電機開環(huán)控制系統(tǒng)的低頻震蕩現(xiàn)象,分析異步電機容易低頻振蕩的機理,指出NPC型三相三電平逆變器在控制性能良好的情況下,死區(qū)是引起異步電機低頻振蕩的主要原因,據此提出一種新型死區(qū)補償策略來改善此現(xiàn)象。
[Abstract]:High-power electronic equipment is widely used in many fields such as power, transportation and so on. Multi-level topology combined with new large-capacity switching devices, excellent control method is the development direction of high-power electronic equipment. Among them, diode midpoint clamp (Neutral-Point Clamped) three-level inverter has become one of the most widely used multilevel converters because of its simple structure and control and high performance-price ratio. In this paper, the research status and research hotspots of several multilevel converters with different topologies are introduced, and then the advantages and disadvantages of different space vector modulation algorithms for three-level are analyzed in detail. Compared with the two levels, the three levels have more vectors, and the ways to realize SVPWM are increased. The problems such as high accuracy, small computation, fast processing speed and small memory occupation of the processing chip are worthy of in-depth analysis. The research object of this paper is subway auxiliary converter, so the quality of output waveform is very high, it needs to have high steady-state accuracy and good dynamic performance, and the system can still run stably when the load is suddenly added and suddenly reduced. In order to meet this requirement, a control strategy based on discrete domain PI state feedback is proposed in this paper. In view of the complexity and difficulty of load current feedforward decoupling channel in discrete domain, the action mechanism of the controller is analyzed in detail, and a new method for solving load current feedforward transfer function is proposed. The simulation and experimental results show that the control method not only makes the steady-state accuracy of the system high, but also meets the requirements of dynamic performance. Finally, according to the low frequency vibration phenomenon of NPC three-phase three-level inverter with asynchronous motor open-loop control system, the mechanism of easy low-frequency oscillation of asynchronous motor is analyzed, and it is pointed out that the NPC three-phase three-level inverter has good control performance. Dead time is the main cause of low frequency oscillation of asynchronous motor. Based on this, a new dead time compensation strategy is proposed to improve this phenomenon.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM464

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