本文選題：二次紋波電壓抑制　切入點(diǎn)：反饋線性化　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：單相AC-DC-DC變換器,因?yàn)榍凹?jí)AC-DC變換器的功率脈動(dòng)造成中間直流電壓出現(xiàn)二倍工頻紋波電壓,傳統(tǒng)的抑制該二次紋波的方法是在中間直流側(cè)并聯(lián)一個(gè)二次紋波LC濾波電路,用以濾除單相整流產(chǎn)生的二倍工頻紋波電壓。但是低頻濾波器的系統(tǒng)體積和重量較大,成本較高,使得應(yīng)用受限。本文主要研究無(wú)LC濾波電路的AC-DC-DC變換器二次紋波電壓抑制控制方法。首先,分析了國(guó)內(nèi)外直流電壓二次脈動(dòng)抑制研究現(xiàn)狀,討論了無(wú)LC濾波電路的AC-DC-DC變換器二次紋波電壓產(chǎn)生機(jī)理。分別針對(duì)前級(jí)AC-DC變換器和后級(jí)DC-DC變換器分析了二次紋波電壓的影響路徑。分析發(fā)現(xiàn),二次紋波電壓會(huì)分別從控制環(huán)路和硬件前向通路,進(jìn)而流通到硬件端口來(lái)影響變換器的輸出,利用Matlab仿真,驗(yàn)證了該分析的正確性。其次,分別針對(duì)前級(jí)AC-DC變換器和后級(jí)DC-DC變換器設(shè)計(jì)了抑制二次紋波電壓影響控制器。在前級(jí)AC-DC變換器采用瞬時(shí)電流控制的基礎(chǔ)上,在電壓控制環(huán)路增加陷波器來(lái)抑制二次紋波電壓進(jìn)入控制環(huán)路中,同時(shí)在電流內(nèi)環(huán)增加輸出電流擾動(dòng)前饋通路來(lái)抑制剩余的諧波擾動(dòng)。對(duì)于后級(jí)DC-DC變換器,在大信號(hào)模型基礎(chǔ)上設(shè)計(jì)出反饋線性化控制器將原先多變量強(qiáng)耦合的非線性DC-DC變換器系統(tǒng)線性化,并實(shí)現(xiàn)輸入輸出電壓解耦,為了進(jìn)一步抑制DC-DC變換器輸出電壓紋波,增加了輸出擾動(dòng)前控制通路。同時(shí),對(duì)于后級(jí)DC-DC變換器,設(shè)計(jì)了輸入電壓前饋的抑制方法。與傳統(tǒng)比例積分及輸入電壓前饋的抑制方法的結(jié)果對(duì)比,驗(yàn)證了所提出的控制器的紋波電壓抑制的有效性。最后,完成了前述給出的算法程序設(shè)計(jì),搭建220W的單相三電平二極管箝位AC-DC-DC變換器驗(yàn)證性實(shí)驗(yàn)系統(tǒng),進(jìn)行穩(wěn)態(tài)和瞬態(tài)實(shí)驗(yàn)。對(duì)比了所提控制方法與傳統(tǒng)抑制控制方法和輸入電壓前饋的抑制方法,實(shí)驗(yàn)結(jié)果表明所提控制方法對(duì)系統(tǒng)的交流輸入電流和直流輸出電壓能夠取得更好的抑制效果。
[Abstract]:Single phase AC-DC-DC converter, because the power pulsation of the former AC-DC converter causes a double power frequency ripple voltage in the intermediate DC voltage, the traditional method to suppress the secondary ripple is to parallel a secondary ripple LC filter circuit at the middle DC side. It is used to filter the double power frequency ripple voltage generated by single-phase rectifier. However, the low frequency filter system is larger in volume and weight and higher in cost. In this paper, the secondary ripple voltage suppression control method of AC-DC-DC converter without LC filter circuit is studied. Firstly, the current research situation of DC voltage secondary ripple suppression is analyzed at home and abroad. The mechanism of secondary ripple voltage generation in AC-DC-DC converter without LC filter circuit is discussed. The influence paths of secondary ripple voltage are analyzed for the former AC-DC converter and the back stage DC-DC converter respectively. The secondary ripple voltage will affect the output of the converter from the control loop and the hardware forward path respectively, and then flow to the hardware port to influence the output of the converter. The correctness of the analysis is verified by Matlab simulation. The controller for suppressing the secondary ripple voltage influence is designed for the former AC-DC converter and the back stage DC-DC converter respectively. Based on the instantaneous current control of the former AC-DC converter, A notch is added in the voltage control loop to suppress the secondary ripple voltage from entering the control loop, and the output current disturbance feedforward path is added to the current inner loop to suppress the remaining harmonic disturbances. Based on the large signal model, a feedback linearization controller is designed to linearize the nonlinear DC-DC converter system with multivariable and strong coupling, and to decouple the input and output voltage. In order to further suppress the ripple of the output voltage of the DC-DC converter, a feedback linearization controller is designed. At the same time, the input voltage feedforward suppression method is designed for the rear stage DC-DC converter, which is compared with the results of the traditional proportional integral and input voltage feedforward suppression methods. The effectiveness of the proposed controller for ripple voltage suppression is verified. Finally, the algorithm program is designed, and a verification experiment system of 220 W single-phase three-level diode clamped AC-DC-DC converter is built. The steady-state and transient experiments are carried out. The proposed control method is compared with the traditional suppression control method and the input voltage feedforward suppression method. Experimental results show that the proposed control method can achieve better suppression effect on AC input current and DC output voltage of the system.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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