【摘要】：隨著電力電子技術的快速發(fā)展,交流變頻調(diào)速技術也取得了顯著的進步。空間矢量脈寬調(diào)制(SVPWM)技術通過控制電壓空間矢量來形成近似圓形的磁鏈矢量,具有諧波含量少、轉矩脈動小、民壓利用率高等優(yōu)點,是一種性能優(yōu)越的調(diào)速技術�，F(xiàn)場可編程門陣列(FPGA)具有功耗低、速度快、靈活性強、開發(fā)周期短等優(yōu)勢。因此利用FPGA實現(xiàn)SVPWM可以有效提高系統(tǒng)的運算速度和適用性。首先介紹了 SVPWM控制的原理及設計方法,根據(jù)零矢量插入位置的不同,闡述了七段式和五段式兩種脈寬調(diào)制方式的優(yōu)缺點,七段式調(diào)制方式諧波含量小,開關次數(shù)多,五段式調(diào)制方式開關次數(shù)少,諧波含量高。為了使諧波含量盡量少,選擇了七段式脈寬調(diào)制方式。其次分析了單模式過調(diào)制算法,其算法簡單、易于實現(xiàn),但是損失了一部分基波電壓,并且無法達到六拍階梯波狀態(tài)。為了改善單模式過調(diào)制算法的不足,采用了雙模式過調(diào)制算法,這種過調(diào)制算法對輸出電壓的基波進行了補償,系統(tǒng)能夠平滑地從線性調(diào)制區(qū)過渡到六拍階梯波狀態(tài)。然后采用自頂向下的方法設計了系統(tǒng)的各個模塊,完成SVPWM控制系統(tǒng)頂層文件的設計,并用Modelsim分別對各個模塊和整個控制系統(tǒng)進行了仿真,仿真結果和理論分析一致。最后,在開發(fā)板上實際驗證了基于FPGA的SVPWM控制系統(tǒng),實驗結果與仿真結果相同。結果表明雙模式過調(diào)制算法改善了單模式算法的缺陷,能夠輸出六路性能良好的PWM控制信號,達到了預期的設計目標,驗證了設計的正確性與可行性。
[Abstract]:With the rapid development of power electronics technology, AC frequency conversion speed regulation technology has made remarkable progress. Space Vector Pulse width Modulation (SVPWM) technology is an excellent speed regulation technique, which forms an approximate circular flux vector by controlling the voltage space vector. It has the advantages of less harmonic content, less torque ripple and high utilization ratio of the civilian voltage. Field Programmable Gate Array (FPGA) has the advantages of low power consumption, high speed, high flexibility and short development cycle. Therefore, using FPGA to realize SVPWM can effectively improve the speed and applicability of the system. Firstly, the principle and design method of SVPWM control are introduced. According to the different position of zero vector insertion, the advantages and disadvantages of seven segment modulation and five segment pulse width modulation are discussed. The switching frequency of five-segment modulation mode is less and the harmonic content is high. In order to make the harmonic content as small as possible, seven-segment pulse width modulation mode is chosen. Secondly, the single-mode over-modulation algorithm is analyzed. The algorithm is simple and easy to implement, but it loses part of the fundamental voltage and can not reach the six-beat step wave state. In order to improve the shortcomings of the single mode overmodulation algorithm, a double mode overmodulation algorithm is adopted, which compensates the fundamental wave of the output voltage, and the system can smoothly transition from the linear modulation region to the six-beat stepped wave state. Then every module of the system is designed by using the top-down method, and the top-level file of the SVPWM control system is designed. The simulation of each module and the whole control system is carried out by Modelsim, and the simulation results are consistent with the theoretical analysis. Finally, the SVPWM control system based on FPGA is verified on the development board, and the experimental results are the same as the simulation results. The results show that the dual-mode over-modulation algorithm can improve the defects of the single-mode algorithm, and can output six PWM control signals with good performance. The desired design goal is achieved, and the correctness and feasibility of the design are verified.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN761;TN791

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