【摘要】：近年來,隨著社會(huì)的發(fā)展,現(xiàn)代電力電子技術(shù)水平不斷提高,各種非線性用電設(shè)備的數(shù)量和比重都在增加,逆變器的波形控制技術(shù)迅速發(fā)展,對(duì)低諧波、高精密、響應(yīng)速度快的逆變電源需求逐漸增多,逆變電源的高精度與低諧波性能對(duì)保護(hù)用電設(shè)備和減小逆變電源對(duì)電網(wǎng)污染等方面起著巨大的作用,目前存在了各種各樣波形控制技術(shù)。本文以單相逆變器帶非線性負(fù)載為研究對(duì)象,分析逆變器的幾種閉環(huán)控制方法來補(bǔ)償輸出波形的畸變,提高輸出電壓波形質(zhì)量,研究目標(biāo)是使逆變器的輸出電壓波形具有良好的穩(wěn)態(tài)和動(dòng)態(tài)性能。首先建立了單相逆變器的數(shù)學(xué)模型,分析單相逆變器的輸出濾波器參數(shù)選擇方法,確定了輸出濾波器的濾波電感和濾波電容的實(shí)際參數(shù),分析了逆變器輸出波形產(chǎn)生畸變的各種影響因素。然后通過閉環(huán)控制的方法來提高輸出波形的質(zhì)量,介紹了重復(fù)控制的原理,對(duì)單相逆變器采用重復(fù)控制進(jìn)行時(shí)域、頻域仿真分析,仿真結(jié)果說明重復(fù)控制能使系統(tǒng)具有優(yōu)良的穩(wěn)態(tài)性能,輸出電壓的THD較低,但重復(fù)控制存在一個(gè)基波周期的延遲會(huì)使系統(tǒng)的響應(yīng)速度變慢。為了彌補(bǔ)重復(fù)控制的缺點(diǎn),研究了基于重復(fù)控制的PI雙閉環(huán)控制,分析了PI雙閉環(huán)控制的電流內(nèi)環(huán)的設(shè)計(jì)方案,時(shí)域、頻域的仿真分析說明基于重復(fù)控制的PI雙閉環(huán)控制能使逆變器的輸出波形系統(tǒng)具有較好的穩(wěn)態(tài)和動(dòng)態(tài)性能,輸出電壓的THD較低,但是這種復(fù)合控制方法的系統(tǒng)穩(wěn)態(tài)性能沒有單獨(dú)重復(fù)控制好�；谧杩拐{(diào)節(jié)的重復(fù)控制是將重復(fù)控制和極點(diǎn)配置結(jié)合使用,利用極點(diǎn)配置提高系統(tǒng)的阻尼,改善逆變器的動(dòng)態(tài)性能,降低逆變器的輸出阻抗,經(jīng)過時(shí)域、頻域的仿真分析,說明基于阻抗調(diào)節(jié)的重復(fù)控制使逆變器的輸出波形具有良好的穩(wěn)態(tài)和動(dòng)態(tài)性能,輸出電壓的THD值比單獨(dú)重復(fù)控制時(shí)小。單純的LC濾波器存在瞬態(tài)振蕩,通過虛擬阻抗技術(shù)增加系統(tǒng)的阻尼,使逆變器輸出濾波器具有瞬態(tài)振蕩抑制效果好、損耗低、易實(shí)現(xiàn)等優(yōu)點(diǎn)�？梢栽趩蜗嗄孀兤鞯牟ㄐ慰刂品抡婧蛯�(shí)驗(yàn)中采用虛擬阻抗技術(shù),這樣不僅可以消除輸出濾波器的瞬態(tài)振蕩,還能提高逆變器的傳輸效率,改善輸出波形質(zhì)量。最后根據(jù)以上的研究搭建以STM32F407IG型號(hào)的ARM控制芯片為核心的實(shí)驗(yàn)平臺(tái),設(shè)計(jì)各部分硬件電路,編寫各個(gè)算法的軟件程序,實(shí)驗(yàn)結(jié)果表明,本文采用的波形控制方法能正確有效地實(shí)現(xiàn)本文的研究目標(biāo)。
[Abstract]:In recent years, with the development of society, the level of modern power electronics technology has been improved, the number and proportion of all kinds of nonlinear power equipment are increasing, the waveform control technology of inverter has developed rapidly, for low harmonic, high precision, The demand of inverter power supply with fast response speed is increasing gradually. The high precision and low harmonic performance of inverter power supply plays a great role in protecting power equipment and reducing the pollution caused by inverter power supply and so on. At present, there are various waveform control techniques. In this paper, the single-phase inverter with nonlinear load is studied, and several closed-loop control methods of inverter are analyzed to compensate the distortion of output waveform and improve the quality of output voltage waveform. The research goal is to make the output voltage waveform of inverter have good steady and dynamic performance. Firstly, the mathematical model of single-phase inverter is established, and the parameter selection method of output filter of single-phase inverter is analyzed, and the actual parameters of filter inductance and filter capacitance of output filter are determined. The factors influencing the distortion of inverter output waveform are analyzed. Then the closed-loop control method is used to improve the quality of output waveform. The principle of repetitive control is introduced, and the time-domain and frequency-domain simulation analysis of single-phase inverter using repetitive control is carried out. The simulation results show that the repetitive control can make the system have good steady-state performance and the THD of output voltage is low, but the response speed of the system will be slowed down by the delay of a fundamental period in the repetitive control. In order to remedy the shortcoming of repetitive control, the PI double closed loop control based on repetitive control is studied, and the design scheme of PI double closed loop current inner loop, time domain, is analyzed. The simulation analysis in frequency domain shows that PI double closed loop control based on repetitive control can make the output waveform system of inverter have better steady-state and dynamic performance, and the THD of output voltage is lower. However, the steady-state performance of this compound control method is not as good as that of repetitive control alone. The repetitive control based on impedance regulation is a combination of repetitive control and pole configuration, which can improve the damping of the system, improve the dynamic performance of the inverter and reduce the output impedance of the inverter. It is shown that the repetitive control based on impedance regulation makes the output waveform of the inverter have good steady and dynamic performance, and the THD value of the output voltage is smaller than that of the single repetitive control. There is transient oscillation in simple LC filter. By increasing the damping of the system by virtual impedance technique, the inverter output filter has the advantages of good transient oscillation suppression effect, low loss and easy to be realized. Virtual impedance technology can be used in the simulation and experiment of single-phase inverter waveform control, which can not only eliminate the transient oscillation of the output filter, but also improve the transmission efficiency of the inverter and improve the quality of the output waveform. Finally, based on the above research, an experimental platform based on STM32F407IG ARM control chip is built, and the hardware circuits are designed, and the software programs of each algorithm are written. The experimental results show that, The waveform control method used in this paper can realize the research goal correctly and effectively.
【學(xué)位授予單位】：哈爾濱工程大學(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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本文編號(hào)：2410995