發(fā)布時間：2018-04-09 10:26

  本文選題：多電平直流變換器　切入點：SPWM波　出處：《重慶大學》2014年碩士論文

【摘要】：便攜式移動電源作為電力變換的一個重要分支，，以其穩(wěn)定、便攜、環(huán)保的特點作為應急、備用的交流電源在各個領域被廣泛使用。在一些特殊的場所，比如煤礦、野外以及發(fā)生冰災、火災以及地震等自然災害而造成電能無法正常供給的場所，可以作為備用電源向通訊系統(tǒng)、醫(yī)療器械等重要設備供電，從而保證通訊的暢通以及醫(yī)療器械等設備正常工作。 目前，國內(nèi)的便攜式移動電源市場主要被國外廠家所占領，而且技術(shù)水平也和國外有較大差距，研究具有自主知識產(chǎn)權(quán)的便攜式移動電源，不但具有理論方面的意義，而且具有很高的工程應用價值。 便攜式移動電源由前級整流環(huán)節(jié)和后級逆變環(huán)節(jié)組成。前級整流環(huán)節(jié)主要由包括三相不可控整流電路和三電平BUCK電路兩部分，它的作用是將發(fā)電機產(chǎn)生的三相變頻變壓交流電變換為穩(wěn)定的直流電；后級逆變環(huán)節(jié)主要由SPWM波控制的逆變電路和LC濾波電路兩部分組成，它的作用是將整流部分得到的直流電變換成符合用戶需求的穩(wěn)壓穩(wěn)頻單相交流電。針對目前仍存在的一些問題，本文的主要工作一方面針對方案的不足，繼續(xù)完善；另一方面研制出實驗裝置。 全文闡述了論文的研究背景與實際意義，對便攜式移動電源的特點及國內(nèi)外發(fā)展現(xiàn)狀做了介紹，簡單的概括了本文的研究內(nèi)容；結(jié)合便攜式移動電源的具體要求，確定了其主電路的拓撲結(jié)構(gòu)和整體方案。著重分析了三電平BUCK電路的工作原理，確定了基于單片機反饋控制的均壓電路的設計方案，采用閉環(huán)控制來對逆變電路進行穩(wěn)壓輸出的控制；完成了系統(tǒng)的硬件電路和軟件設計。硬件電路包括主電路設計與控制電路設計。軟件設計包括主程序方案設計和子程序方案設計。子程序設計主要包括：①信號采樣及軟件濾波程序設計；②基于三電平BUCK電路輸出電壓的外環(huán)，均壓電路內(nèi)環(huán)的雙閉環(huán)反饋PWM控制；③基于逆變電路輸出電壓的SPWM反饋控制。搭建了實驗裝置，給出了實驗結(jié)果并做了分析，實驗結(jié)果表明本文方案是正確和可行的。
[Abstract]:As an important branch of power conversion, portable mobile power supply is widely used in various fields because of its stable, portable and environmentally friendly characteristics.In some special places, such as coal mines, fields and places where natural disasters such as ice disasters, fires, earthquakes and other natural disasters cause the normal supply of electrical energy, it can be used as a backup power source to supply power to important equipment such as communications systems, medical devices, etc.In order to ensure the smooth flow of communications and medical equipment and other equipment to work properly.At present, the domestic portable mobile power market is mainly occupied by foreign manufacturers, and there is a big gap between the technology level and foreign countries. It is not only of theoretical significance to study portable mobile power supply with independent intellectual property rights, but also to study the portable mobile power supply with independent intellectual property rights.And has the very high engineering application value.Portable mobile power supply is composed of front stage rectifier link and rear stage inverter link.The front-stage rectifier is mainly composed of three-phase uncontrollable rectifier circuit and three-level BUCK circuit. Its function is to convert the three-phase variable frequency AC voltage generated by the generator into a stable direct current.The back stage inverter consists of two parts: the inverter controlled by SPWM wave and the LC filter. Its function is to convert the rectified DC into stable voltage and stable frequency single phase AC.In view of some existing problems, the main work of this paper is to improve the scheme on the one hand, and to develop the experimental device on the other hand.This paper describes the research background and practical significance of the thesis, introduces the characteristics of portable mobile power supply and the current development situation at home and abroad, briefly summarizes the research content of this paper, combined with the specific requirements of portable mobile power supply,The topology and overall scheme of the main circuit are determined.The working principle of three-level BUCK circuit is analyzed emphatically, and the design scheme of voltage sharing circuit based on single-chip microcomputer feedback control is determined. The closed-loop control is used to control the output voltage of inverter circuit.The hardware circuit and software design of the system are completed.The hardware circuit includes main circuit design and control circuit design.Software design includes main program scheme design and subroutine scheme design.The subprogram design mainly includes the sampling of the 1 / 1 signal and the software filtering program. The outer loop based on the output voltage of the three-level BUCK circuit and the SPWM feedback control based on the output voltage of the inverter circuit based on the double closed loop feedback PWM control of the inner loop of the voltage sharing circuit.The experimental results are given and analyzed. The experimental results show that the scheme is correct and feasible.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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本文編號：1726032