【摘要】：能源短缺、環(huán)境污染是當今世界人類面臨的共同難題,我國在此大環(huán)境下提出了“兩個替代”,即清潔替代和電能替代,而在電能消費中尤以高壓大容量電動機為主。三電平逆變器開關(guān)管承受的電壓應(yīng)力為直流側(cè)電壓的一半,因此廣泛應(yīng)用于高壓大容量交流變頻調(diào)速領(lǐng)域,這在很大程度上能夠節(jié)約電能、改善環(huán)境。本文在分析多電平變換器拓撲結(jié)構(gòu)的基礎(chǔ)上,重點圍繞三電平變頻器矢量控制原理和三電平逆變器的SVPWM調(diào)制算法展開研究。論文以異步電機在各坐標系下的數(shù)學模型為基礎(chǔ),分析了按轉(zhuǎn)子磁場定向的異步電機矢量控制原理和基于全階狀態(tài)觀測器的轉(zhuǎn)速估算方法;研究了三電平逆變器的SVPWM調(diào)制算法,重點分析了基于α～β坐標系的SVPWM調(diào)制算法和基于60°坐標系的SVPWM調(diào)制算法。由于60°坐標系下的SVPWM算法更易于實現(xiàn)數(shù)字控制,因而確定采用這種方法作為三電平逆變器的調(diào)制算法。同時分析了引起三電平逆變器中點電位偏移的原因,給出了控制中點電位偏移的方法,并在軟件算法基礎(chǔ)上結(jié)合硬件來控制中點電位的偏移。論文搭建了三電平矢量控制系統(tǒng)仿真平臺,對三電平變頻調(diào)速系統(tǒng)進行了仿真驗證,詳細設(shè)計各個仿真模塊,獲得了仿真波形。仿真結(jié)果表明60°坐標系下SVPWM算法是正確的,硬件結(jié)合軟件控制中點電位平衡算法降低了中點電壓的波動范圍,改善了系統(tǒng)性能。論文以TMS320F28335DSP為控制核心,搭建了三電平變頻調(diào)速系統(tǒng)的實驗驗證平臺,設(shè)計了電路參數(shù),并在CCS 5.5環(huán)境下完成系統(tǒng)的軟件設(shè)計,完成了系統(tǒng)的整體調(diào)試,獲得了實驗波形和實驗結(jié)果。實驗結(jié)果和仿真結(jié)果一致,表明了理論分析的正確性和系統(tǒng)設(shè)計的可行性。
[Abstract]:Energy shortage and environmental pollution are the common problems faced by human beings in the world today. In this environment, our country has put forward "two alternatives", namely, clean substitution and electric power substitution, especially high-voltage and large-capacity electric motors in electric energy consumption. The voltage stress of the three-level inverter switch is half of that of the DC side voltage, so it is widely used in the field of high voltage and large capacity AC frequency conversion speed regulation, which can save electric energy and improve the environment to a great extent. On the basis of analyzing the topology of multilevel converter, this paper focuses on the principle of vector control of three-level inverter and the SVPWM modulation algorithm of three-level inverter. Based on the mathematical models of induction motor in various coordinate systems, the vector control principle of induction motor based on rotor flux orientation and the method of speed estimation based on full order state observer are analyzed in this paper. The SVPWM modulation algorithm of three-level inverter is studied. The SVPWM modulation algorithm based on 偽 ~ 尾 coordinate system and the SVPWM modulation algorithm based on 60 擄coordinate system are analyzed. Because the SVPWM algorithm in 60 擄coordinate system is easier to realize digital control, this method is adopted as the modulation algorithm of three-level inverter. At the same time, the causes of neutral point potential shift in three-level inverter are analyzed, and the method of controlling neutral point potential migration is given. The offset of neutral point potential is controlled based on software algorithm and hardware. The simulation platform of three-level vector control system is built in this paper. The simulation verification of three-level variable-frequency speed regulation system is carried out. Each simulation module is designed in detail and the simulation waveform is obtained. The simulation results show that the SVPWM algorithm is correct in 60 擄coordinate system. The hardware and software control midpoint potential balance algorithm reduces the fluctuation range of midpoint voltage and improves the system performance. This paper takes TMS320F28335DSP as the control core, builds the experimental verification platform of the three-level variable-frequency speed regulation system, designs the circuit parameters, and completes the software design of the system under the environment of CCS 5.5, and completes the whole debugging of the system. Experimental waveforms and experimental results are obtained. The experimental results are consistent with the simulation results, which show the correctness of the theoretical analysis and the feasibility of the system design.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464;TM343

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本文編號：2299054