本文選題：逆變 + SPWM　； 參考：《昆明理工大學(xué)》2014年碩士論文

【摘要】：科學(xué)技術(shù)日新月異的今天,電力電子技術(shù)也在不斷創(chuàng)新,隨著高性能低成本數(shù)字處理器的問(wèn)世,傳統(tǒng)的模擬電路逐漸被數(shù)字電路取代。在逆變電源領(lǐng)域,傳統(tǒng)的模擬控制器已經(jīng)暴露了它固有缺陷,而數(shù)字控制器不僅能彌補(bǔ)它的缺陷且更容易實(shí)現(xiàn)先進(jìn)的控制技術(shù)。因此,逆變電源數(shù)字化已成為當(dāng)前逆變領(lǐng)域的發(fā)展趨勢(shì)。由于400Hz中頻電源在軍事和民航領(lǐng)域的市場(chǎng)需求在不斷增大,因此,高質(zhì)量、高性能的400Hz中頻逆變電源成為電源領(lǐng)域研究的又一個(gè)熱點(diǎn)。本文采用了高性能的數(shù)字處理器TMS320F28335作為主控制器,并在此基礎(chǔ)上對(duì)單相400Hz中頻逆變電源進(jìn)行研究與實(shí)現(xiàn)。 首先,本文討論了單相逆變電源的工作原理,針對(duì)其調(diào)制方式選擇了SPWM調(diào)制中的單極性、雙極性和單極倍頻進(jìn)行對(duì)比分析,最終選擇了單極性倍頻SPWM調(diào)制方式。通過(guò)對(duì)比分析對(duì)稱規(guī)則采樣法和不對(duì)稱規(guī)則采樣法,并對(duì)這兩方法產(chǎn)生的SPWM脈寬進(jìn)行了定量計(jì)算,綜合考慮后選擇不對(duì)稱規(guī)則采樣法來(lái)實(shí)現(xiàn)數(shù)字化SPWM。在單極性倍頻調(diào)制下系統(tǒng)開(kāi)關(guān)頻率在原來(lái)基礎(chǔ)上可以提高一倍,使得逆變電源輸出的脈動(dòng)電壓頻率提高一倍,有利于減小輸出濾波器的體積,增強(qiáng)濾波效果,同時(shí)也減小了系統(tǒng)諧波含量,提高輸出電能的質(zhì)量。不對(duì)稱規(guī)則采樣法不僅可以使得系統(tǒng)采樣頻率增加一倍,提高了系統(tǒng)的控制精度而且可以消除偶次諧波,很好的改善輸出波形的質(zhì)量。 然后,本文在逆變電源數(shù)字控制技術(shù)上采用電壓、電流瞬時(shí)值雙閉環(huán)反饋與數(shù)字PID相結(jié)合,并對(duì)其進(jìn)行相關(guān)的數(shù)學(xué)建模,給出相關(guān)傳遞函數(shù)并對(duì)其進(jìn)行分析。PID實(shí)現(xiàn)數(shù)字化后對(duì)其積分項(xiàng)進(jìn)行分離改進(jìn)使其更符合本系統(tǒng)的實(shí)際需求,并推導(dǎo)出數(shù)字PID相關(guān)參數(shù)整定的方法。通過(guò)對(duì)這種控制技術(shù)的分析可以得出：電壓、電流雙閉環(huán)反饋PID控制技術(shù)可以提高逆變電源系統(tǒng)動(dòng)態(tài)特性,減小穩(wěn)態(tài)誤差,提高輸出波形的質(zhì)量。 最后,本文根據(jù)上述方案完成了整個(gè)400Hz逆變系統(tǒng)的硬件設(shè)計(jì),并對(duì)硬件設(shè)計(jì)中相關(guān)的重要參數(shù)進(jìn)行理論上的推算,并不斷在實(shí)驗(yàn)中微調(diào)校準(zhǔn)。同時(shí)也完成了整個(gè)系統(tǒng)的軟件設(shè)計(jì),針對(duì)SPWM的軟件實(shí)現(xiàn)作了具體的闡述。通過(guò)對(duì)實(shí)驗(yàn)調(diào)試中得到的相關(guān)波形和數(shù)據(jù)的分析,表明本系統(tǒng)設(shè)計(jì)是合理可靠的,且輸出波形的質(zhì)量得到很好的改善。
[Abstract]:With the rapid development of science and technology, power electronics technology is constantly innovating. With the advent of high performance and low cost digital processors, traditional analog circuits are gradually replaced by digital circuits. In the field of inverter power supply, the traditional analog controller has exposed its inherent defects, but the digital controller can not only make up for its defects, but also realize the advanced control technology more easily. Therefore, the digitization of inverter power supply has become the current trend of development in the field of inverter. Due to the increasing market demand of 400Hz intermediate frequency power supply in the military and civil aviation fields, the high quality and high performance 400Hz intermediate frequency inverter power supply has become another hot spot in the field of power supply. In this paper, the high performance digital processor (TMS320F28335) is used as the main controller, and on this basis, the single-phase 400Hz if inverter is studied and implemented. Firstly, the working principle of single-phase inverter power supply is discussed. Unipolarity, bipolarity and unipolar frequency doubling in SPWM modulation are selected for its modulation mode. Finally, unipolar frequency doubling SPWM modulation mode is chosen. The symmetrical regular sampling method and the asymmetric regular sampling method are compared, and the SPWM pulse width produced by these two methods is calculated quantitatively. After considering the asymmetric regular sampling method, the digitized SPWM is realized. Under unipolar frequency doubling modulation, the switching frequency of the system can be doubled on the original basis, and the pulsating voltage frequency of the inverter power output can be doubled, which is helpful to reduce the volume of the output filter and enhance the filtering effect. At the same time, it also reduces the harmonic content of the system and improves the quality of the output power. The asymmetric regular sampling method can not only double the sampling frequency of the system, but also improve the control accuracy of the system, eliminate even harmonics, and improve the quality of the output waveform. Then, this paper combines voltage and current double closed loop feedback with digital PID in the digital control technology of inverter power supply, and carries on the related mathematical modeling to it. The correlation transfer function is given and analyzed. Pid is digitized and the integral term is separated and improved to meet the actual needs of the system. The method of setting the relevant parameters of digital PID is deduced. Through the analysis of this control technology, it can be concluded that the voltage and current double closed-loop feedback PID control technology can improve the dynamic characteristics of the inverter power supply system, reduce the steady-state error and improve the quality of the output waveform. Finally, according to the above scheme, the hardware design of the whole 400Hz inverter system is completed, and the related important parameters in the hardware design are calculated theoretically, and calibrated continuously in the experiment. At the same time, the software design of the whole system is completed, and the software implementation of SPWM is expounded. The analysis of the relevant waveforms and data obtained in the experiment and debugging shows that the design of the system is reasonable and reliable, and the quality of the output waveforms has been improved very well.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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