【摘要】：在逆變器發(fā)展初期,大多采用模擬電路和開(kāi)環(huán)控制,這種方式的電路結(jié)構(gòu)簡(jiǎn)單、成本低,但是輸出電壓的波形發(fā)生了明顯畸變,總諧波系數(shù)(THD)大、輸出電壓波形受負(fù)載影響大且不可控。因此,在對(duì)輸出電壓質(zhì)量要求不高的場(chǎng)合,可以使用開(kāi)環(huán)控制系統(tǒng),而對(duì)電能質(zhì)量要求較高的場(chǎng)合,必須使用閉環(huán)控制系統(tǒng)。隨著數(shù)字信號(hào)處理器(DSP)的發(fā)展,逆變電源的數(shù)字化電路設(shè)計(jì)成為可能。數(shù)字化控制系統(tǒng)的可靠性高、硬件電路結(jié)構(gòu)簡(jiǎn)單、能夠方便實(shí)現(xiàn)實(shí)時(shí)控制和多種控制算法。本文對(duì)單相全橋逆變電路的三種正弦脈沖寬度調(diào)制(SPWM)方式進(jìn)行了理論分析與仿真對(duì)比[1],得出單極性倍頻SPWM技術(shù)能夠更好地抑制負(fù)載端輸出電壓的諧波。為了實(shí)現(xiàn)逆變電源的數(shù)字化控制,分析了規(guī)則采樣法和自然采樣法。文章對(duì)單相全橋逆變電路的數(shù)字控制系統(tǒng)進(jìn)行了仿真研究,設(shè)計(jì)PI控制外環(huán)和重復(fù)控制內(nèi)環(huán)組成的雙閉環(huán)控制系統(tǒng),該數(shù)字控制系統(tǒng)將負(fù)載端的輸出電壓作為被控量和參考標(biāo)準(zhǔn)。其中,PI外環(huán)是對(duì)負(fù)載端輸出電壓的均值進(jìn)行控制,重復(fù)控制內(nèi)環(huán)是對(duì)其瞬時(shí)值進(jìn)行校正,PI外環(huán)可以根據(jù)負(fù)載的變化來(lái)相應(yīng)地調(diào)節(jié)重復(fù)控制內(nèi)環(huán)的給定值,從而使單相全橋逆變電路的輸出電壓波形有了很大的改進(jìn)。以TMS320F2812DSP為核心的數(shù)字控制系統(tǒng),熟悉整個(gè)硬件電路和軟件程序的設(shè)計(jì),包括逆變電源主電路、電源結(jié)構(gòu)、驅(qū)動(dòng)電路、保護(hù)電路和濾波電路等。軟件設(shè)計(jì)采用模塊化程序結(jié)構(gòu),包括主程序、A/D、產(chǎn)生SPWM波形等子程序模塊。最后,在TMS320F2812DSP為控制芯片的實(shí)驗(yàn)平臺(tái)上,完成該數(shù)字控制系統(tǒng)的調(diào)試。實(shí)驗(yàn)結(jié)果表明該數(shù)字控制系統(tǒng)能夠產(chǎn)生比較理想的輸出電壓波形,證明了其控制系統(tǒng)的可行性和有效性。
[Abstract]:In the early stage of inverter development, analog circuits and open-loop control are mostly used. The circuit structure of this method is simple and the cost is low, but the waveform of output voltage has been obviously distorted, the total harmonic coefficient (THD) is large, and the output voltage waveform is greatly affected by load and uncontrollable. Therefore, the open-loop control system can be used in the case of low output voltage quality, but the closed-loop control system must be used in the case of high power quality requirements. With the development of digital signal processor (DSP), the digital circuit design of inverter power supply is possible. The digital control system has high reliability and simple hardware circuit structure, and can easily realize real-time control and various control algorithms. In this paper, three sinusoidal pulse width modulation (SPWM) methods for single-phase full-bridge inverter circuits are theoretically analyzed and compared with simulation [1]. It is concluded that unipolar frequency doubling SPWM technology can better suppress the harmonics of the output voltage at the load end. In order to realize the digital control of inverter power supply, the regular sampling method and natural sampling method are analyzed. In this paper, the digital control system of single-phase full-bridge inverter circuit is simulated and studied, and a double closed-loop control system composed of PI control outer loop and repeated control inner loop is designed. The digital control system takes the output voltage at the load end as the controlled quantity and reference standard. Among them, the PI outer loop controls the mean output voltage of the load terminal, and the repetitive control inner loop corrects its instantaneous value. The PI outer loop can adjust the given value of the repetitive control inner loop according to the change of the load, so that the output voltage waveform of the single-phase full-bridge inverter circuit has been greatly improved. The digital control system based on TMS320F2812DSP is familiar with the design of the whole hardware circuit and software program, including the main circuit of inverter power supply, power structure, driving circuit, protection circuit and filter circuit. The software design adopts modular program structure, including main program, A / D, generating SPWM waveform and other subroutine modules. Finally, the digital control system is debugged on the experimental platform of TMS320F2812DSP as the control chip. The experimental results show that the digital control system can produce ideal output voltage waveform, which proves the feasibility and effectiveness of the control system.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM464

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張興;汪楊俊;余暢舟;喬彩霞;周巖峰;倪華;;采用PI+重復(fù)控制的并網(wǎng)逆變器控制耦合機(jī)理及其抑制策略[J];中國(guó)電機(jī)工程學(xué)報(bào);2014年30期

2 賈要勤;朱明琳;鳳勇;;基于狀態(tài)反饋的單相電壓型逆變器重復(fù)控制[J];電工技術(shù)學(xué)報(bào);2014年06期

3 孫澄宇;鄒剛;;基于DSP的特定消諧變頻器的設(shè)計(jì)方法研究[J];吉林化工學(xué)院學(xué)報(bào);2014年01期

4 周娟;;基于規(guī)則采樣法的PWM波形程序設(shè)計(jì)方法[J];中國(guó)科教創(chuàng)新導(dǎo)刊;2014年02期

5 葉程;黃梓瑜;白琳;趙松柏;曾萍;高文剛;;基于DSP的SPWM波形產(chǎn)生算法研究[J];中國(guó)高新技術(shù)企業(yè);2013年09期

6 殷進(jìn)軍;劉邦銀;段善旭;;LCL濾波并網(wǎng)逆變器雙環(huán)控制參數(shù)設(shè)計(jì)與優(yōu)化[J];電力系統(tǒng)自動(dòng)化;2013年09期

7 王小星;范可;陳夢(mèng)慧;謝立楠;;單極性倍頻SPWM波形生成及其諧波分析[J];湖北工業(yè)大學(xué)學(xué)報(bào);2012年05期

8 張路;孫志毅;何秋生;;基于AVR的雙極性SPWM調(diào)制逆變技術(shù)[J];工業(yè)控制計(jì)算機(jī);2012年05期

9 易宏;代冀陽(yáng);伍家駒;;單相逆變系統(tǒng)建模與控制仿真研究[J];計(jì)算機(jī)仿真;2010年08期

10 谷楊心;;基于DSP的逆變器分段同步調(diào)制算法的研究[J];電測(cè)與儀表;2010年06期

，

本文編號(hào)：2505915