直流降壓變換器滑�？刂葡到y(tǒng)非線性動(dòng)力學(xué)行為研究
發(fā)布時(shí)間：2018-09-12 10:47
【摘要】：隨著綠色用電、環(huán)保用電、能源之星認(rèn)證等節(jié)能降耗政策的陸續(xù)出臺(tái),電能變換質(zhì)量將是電源產(chǎn)業(yè)面臨和亟待解決的問題,也是目前控制界和工程界科研工作者關(guān)注的焦點(diǎn)。據(jù)電力電子行業(yè)深度調(diào)查報(bào)告:目前電能的耗用占所有能源耗用的百分之五十五,其中約百分之七十的電能是通過電力電子設(shè)備的轉(zhuǎn)換后使用。本文以直流降壓變換器(又稱為DC-DC Buck變換器)作為控制對(duì)象,旨在研究滑�？刂品椒☉�(yīng)用于Buck變換器時(shí)誘發(fā)的非線性動(dòng)力學(xué)行為,在時(shí)域和頻域內(nèi)對(duì)其穩(wěn)定性、高頻抖振問題、分岔現(xiàn)象、未建模動(dòng)態(tài)等展開具體分析,并最終通過多相滑�？刂品椒▽�(shí)現(xiàn)Buck變換器非線性行為的定量抑制。Buck變換器是一類典型的具有開關(guān)特性的變結(jié)構(gòu)系統(tǒng),非常多的文獻(xiàn)已經(jīng)證明滑模控制(Sliding Mode Control)的繼電控制特性與Buck變換器具有強(qiáng)適應(yīng)性。本文首先闡述滑�？刂频幕驹�,基于建立的Buck變換器在開關(guān)管開通/截止情況下的一致微分方程模型,詳細(xì)給出目前常用的線性滑模、終端滑模和非奇異終端滑�？刂品椒ǖ脑O(shè)計(jì)過程,在時(shí)域內(nèi)推導(dǎo)出保證Buck變換器滑�？刂葡到y(tǒng)穩(wěn)定的條件,研究控制器設(shè)計(jì)參數(shù)的整定,并在一個(gè)開關(guān)周期內(nèi)推導(dǎo)出功率開關(guān)管的開關(guān)頻率。Buck變換器是一類典型的時(shí)變非線性系統(tǒng),儲(chǔ)能元件電容和電感的非線性、滯環(huán)調(diào)制邊界層的非線性等直接影響著系統(tǒng)的瞬態(tài)響應(yīng)和輸出電壓品質(zhì)。本文以穩(wěn)定性作為控制指標(biāo),建立Buck變換器的采樣數(shù)據(jù)模型,利用Filippov方法對(duì)Buck變換器的非線性進(jìn)行分析和研究。以電源電壓作為分岔參數(shù),以鋸齒波一個(gè)周期內(nèi)的電容電壓采樣值作為變量,判斷和分析Buck電路的分岔情況;根據(jù)特征根選取電路參數(shù),并分析了不同非線性電路參數(shù)對(duì)系統(tǒng)性能的影響,從而抑制電路振蕩現(xiàn)象發(fā)生,保證Buck變換器系統(tǒng)的穩(wěn)定性。未建模動(dòng)態(tài)是影響B(tài)uck變換器滑�？刂葡到y(tǒng)非線性動(dòng)力學(xué)行為的重要因素,尤其是滑�？刂茻o法避免的高頻抖振問題,會(huì)誘發(fā)系統(tǒng)的高頻段諧波,消耗更多的能量,使得系統(tǒng)產(chǎn)生振蕩甚至趨于不穩(wěn)定。本文首先建立傳感器和執(zhí)行器的未建模動(dòng)態(tài)模型,推導(dǎo)出未建模動(dòng)態(tài)模型的小時(shí)間常數(shù)對(duì)Buck變換器滑模控制系統(tǒng)不連續(xù)控制的系統(tǒng)的數(shù)學(xué)影響關(guān)系,并基于描述函數(shù)法對(duì)未建模動(dòng)態(tài)誘發(fā)的高頻輸出電壓諧波在頻域內(nèi)進(jìn)行定量分析,在頻域內(nèi)推導(dǎo)出幅值和頻率與未建模動(dòng)態(tài)、Buck變換器滯環(huán)調(diào)制等的數(shù)學(xué)影響關(guān)系。滯環(huán)調(diào)制的非線性已揭示為影響B(tài)uck變換器滑�？刂葡到y(tǒng)非線性動(dòng)力學(xué)行為的關(guān)鍵因素,而在實(shí)際系統(tǒng)則是通過功率開關(guān)管實(shí)現(xiàn),進(jìn)而誘發(fā)復(fù)雜的輸出電流諧波。本文基于多滑�？刂品椒�,首先闡述其設(shè)計(jì)過程,進(jìn)而將其應(yīng)用于Buck變換器。分析輸出電流諧波在穩(wěn)態(tài)滑模面附近的運(yùn)動(dòng)軌跡,推導(dǎo)出滯環(huán)調(diào)制寬度與每一個(gè)功率開關(guān)管的振蕩幅值和頻率的數(shù)學(xué)關(guān)系式,并通過調(diào)整多相滑模間的相位關(guān)系,使得各相中的諧波非線性相互抵消,進(jìn)而提高Buck變換器輸出電壓品質(zhì)。以上研究成果均圍繞滑�？刂品椒ㄕ归_,且通過仿真實(shí)驗(yàn)進(jìn)行驗(yàn)證和對(duì)比,仿真結(jié)果表明本文所提控制方法的是有效的,并且可以實(shí)施執(zhí)行。
[Abstract]:With the introduction of energy-saving and consumption-reducing policies such as green power, environmental protection and energy star certification, the quality of power conversion will be a problem that the power industry faces and needs to be solved urgently. It is also the focus of the current control and engineering researchers. Fifty-five percent of the energy used is converted from power electronic devices to power electronic devices. In this paper, DC buck converter (also known as DC-DC Buck converter) is used as the control object to study the nonlinear dynamic behavior induced by sliding mode control applied to Buck converter in time domain and frequency domain. Stability, high frequency buffeting, bifurcation and unmodeled dynamics are analyzed in detail, and the nonlinear behavior of Buck converter is quantitatively suppressed by multiphase sliding mode control method. Buck converter is a typical variable structure system with switching characteristics. Sliding mode control has been proved in many literatures. The basic principle of sliding mode control is described in this paper. Based on the established uniform differential equation model of Buck converter under switching on/off condition, the design process of linear sliding mode, terminal sliding mode and non-singular terminal sliding mode control method is given in detail. The stability conditions of the sliding mode control system of Buck converter are deduced in the time domain. The design parameters of the controller are studied and the switching frequency of the power switch is deduced in a switching period. Linearity and other factors directly affect the transient response and output voltage quality of the system.In this paper,the stability is taken as the control index,the sampling data model of Buck converter is established,and the non-linearity of Buck converter is analyzed and studied by Filippov method.The power supply voltage is taken as the bifurcation parameter,and the capacitor voltage is sampled in a period of sawtooth wave. The bifurcation of Buck converter is judged and analyzed by using the value as a variable, the circuit parameters are selected according to the characteristic root, and the influence of different nonlinear circuit parameters on the performance of the system is analyzed, so as to suppress the circuit oscillation and ensure the stability of the Buck converter system. The important factors of mechanical behavior, especially the high frequency chattering problem which is unavoidable by sliding mode control, will induce the high frequency harmonics of the system, consume more energy, and make the system oscillate or even tend to be unstable. The mathematic influence relation of discontinuous control system of Buck converter sliding mode control system is analyzed quantitatively in frequency domain based on descriptive function method. The mathematic influence relation of amplitude and frequency with unmodeled dynamics and hysteresis modulation of Buck converter is deduced in frequency domain. Modulation nonlinearity has been revealed to be the key factor affecting the nonlinear dynamic behavior of Buck converter sliding mode control system. In practical systems, complex output current harmonics are induced by power switching transistors. The motion trajectory of the output current harmonics near the steady-state sliding surface is analyzed. The mathematical relationship between the width of hysteresis modulation and the oscillation amplitude and frequency of each power switch is derived. By adjusting the phase relationship between the multi-phase sliding modes, the harmonic nonlinearities in each phase are cancelled out and the output voltage quality of the Buck converter is improved. The above research results are all around the sliding mode control method, and the simulation experiments are carried out to verify and compare. The simulation results show that the proposed control method is effective and can be implemented.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;TM46
本文編號(hào)：2238761
[Abstract]:With the introduction of energy-saving and consumption-reducing policies such as green power, environmental protection and energy star certification, the quality of power conversion will be a problem that the power industry faces and needs to be solved urgently. It is also the focus of the current control and engineering researchers. Fifty-five percent of the energy used is converted from power electronic devices to power electronic devices. In this paper, DC buck converter (also known as DC-DC Buck converter) is used as the control object to study the nonlinear dynamic behavior induced by sliding mode control applied to Buck converter in time domain and frequency domain. Stability, high frequency buffeting, bifurcation and unmodeled dynamics are analyzed in detail, and the nonlinear behavior of Buck converter is quantitatively suppressed by multiphase sliding mode control method. Buck converter is a typical variable structure system with switching characteristics. Sliding mode control has been proved in many literatures. The basic principle of sliding mode control is described in this paper. Based on the established uniform differential equation model of Buck converter under switching on/off condition, the design process of linear sliding mode, terminal sliding mode and non-singular terminal sliding mode control method is given in detail. The stability conditions of the sliding mode control system of Buck converter are deduced in the time domain. The design parameters of the controller are studied and the switching frequency of the power switch is deduced in a switching period. Linearity and other factors directly affect the transient response and output voltage quality of the system.In this paper,the stability is taken as the control index,the sampling data model of Buck converter is established,and the non-linearity of Buck converter is analyzed and studied by Filippov method.The power supply voltage is taken as the bifurcation parameter,and the capacitor voltage is sampled in a period of sawtooth wave. The bifurcation of Buck converter is judged and analyzed by using the value as a variable, the circuit parameters are selected according to the characteristic root, and the influence of different nonlinear circuit parameters on the performance of the system is analyzed, so as to suppress the circuit oscillation and ensure the stability of the Buck converter system. The important factors of mechanical behavior, especially the high frequency chattering problem which is unavoidable by sliding mode control, will induce the high frequency harmonics of the system, consume more energy, and make the system oscillate or even tend to be unstable. The mathematic influence relation of discontinuous control system of Buck converter sliding mode control system is analyzed quantitatively in frequency domain based on descriptive function method. The mathematic influence relation of amplitude and frequency with unmodeled dynamics and hysteresis modulation of Buck converter is deduced in frequency domain. Modulation nonlinearity has been revealed to be the key factor affecting the nonlinear dynamic behavior of Buck converter sliding mode control system. In practical systems, complex output current harmonics are induced by power switching transistors. The motion trajectory of the output current harmonics near the steady-state sliding surface is analyzed. The mathematical relationship between the width of hysteresis modulation and the oscillation amplitude and frequency of each power switch is derived. By adjusting the phase relationship between the multi-phase sliding modes, the harmonic nonlinearities in each phase are cancelled out and the output voltage quality of the Buck converter is improved. The above research results are all around the sliding mode control method, and the simulation experiments are carried out to verify and compare. The simulation results show that the proposed control method is effective and can be implemented.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;TM46
【參考文獻(xiàn)】
相關(guān)期刊論文 前9條
1 李哲;李穎暉;吳辰;陳柄任;;電流反饋型Buck變換器分岔動(dòng)力學(xué)分析及穩(wěn)定性控制[J];電力系統(tǒng)保護(hù)與控制;2016年18期
2 賈美美;張國(guó)山;;電壓控制型Buck變換器的混沌控制[J];電子科技大學(xué)學(xué)報(bào);2016年02期
3 馬莉;王常青;丁世宏;趙德安;;Buck型功率變換器無抖振滑�？刂破髟O(shè)計(jì)[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2016年05期
4 張黎明;董戈;汝曉鵬;;Buck開關(guān)變換器混沌和分岔現(xiàn)象研究[J];計(jì)算機(jī)與數(shù)字工程;2015年08期
5 李永恒;梁青陽;孫超;孫哲;;Buck變換器的冪次函數(shù)指數(shù)趨近律滑模算法研究[J];電光與控制;2015年02期
6 畢闖;向勇;張千;王京梅;;Buck ZCS PWM變換器非線性動(dòng)力學(xué)研究[J];系統(tǒng)仿真學(xué)報(bào);2014年03期
7 穆朝絮;余星火;孫長(zhǎng)銀;;非奇異終端滑�？刂葡到y(tǒng)相軌跡和暫態(tài)分析[J];自動(dòng)化學(xué)報(bào);2013年06期
8 王明渝;馬偉;;單周期控制DC/DC變換器穩(wěn)定性分析[J];電力電子技術(shù);2011年07期
9 孫紅章;毛愛霞;蘇向英;劉磊;魏榮慧;劉鋼;;Henon系統(tǒng)動(dòng)力學(xué)行為的MATLAB仿真研究[J];商丘師范學(xué)院學(xué)報(bào);2011年03期
相關(guān)博士學(xué)位論文 前3條
1 申宇;滑模變結(jié)構(gòu)控制中抖振的特性研究與抑制[D];西安電子科技大學(xué);2012年
2 馬偉;單周期控制功率變換器復(fù)雜動(dòng)力學(xué)行為研究[D];重慶大學(xué);2011年
3 王艷敏;柔性機(jī)械手非奇異終端滑�？刂品椒ǖ难芯縖D];哈爾濱工業(yè)大學(xué);2009年
相關(guān)碩士學(xué)位論文 前6條
1 尚佳寧;直流開關(guān)變換器的精確建模和穩(wěn)定性分析方法研究[D];北京交通大學(xué);2016年
2 楊代利;全魯棒滑�？刂评碚摰难芯颗c應(yīng)用[D];新疆大學(xué);2014年
3 肖發(fā)福;DC/DC變換器混沌現(xiàn)象及其控制研究[D];重慶大學(xué);2014年
4 韓向偉;交流永磁同步電動(dòng)機(jī)的高階滑�？刂芠D];哈爾濱工業(yè)大學(xué);2007年
5 張柯;DC/DC變換器混沌建模與控制的研究[D];重慶大學(xué);2006年
6 鄒艷麗;非線性電路系統(tǒng)中的混沌及其控制研究[D];廣西師范大學(xué);2003年
，本文編號(hào)：2238761
本文鏈接：http://www.sikaile.net/kejilunwen/zidonghuakongzhilunwen/2238761.html
最近更新
教材專著
