本文選題：開關(guān)功率變換器　切入點(diǎn)：快變不穩(wěn)定行為　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：開關(guān)功率變換器集合了功率管非線性元件和儲能元件，其工作特性表現(xiàn)為時(shí)域分段線性特點(diǎn)，具有強(qiáng)耦合非線性特性，不僅會給電力系統(tǒng)注入大量諧波，而且當(dāng)系統(tǒng)參數(shù)發(fā)生變化時(shí)，還會出現(xiàn)豐富的不穩(wěn)定現(xiàn)象，如次諧波振蕩、低頻振蕩等。這些不穩(wěn)定行為的存在造成開關(guān)功率變換器系統(tǒng)的工作性能惡化。為此，本文以峰值電流模式開關(guān)功率變換器的快變不穩(wěn)定行為(如次諧波)的動態(tài)斜坡補(bǔ)償(DSC，dynamical slope compensation)控制策略，結(jié)合典型的DC/DC Buck變換器和Boost PFC AC/DC變換器為研究對象，展開了相關(guān)的理論分析和實(shí)驗(yàn)研究，為開關(guān)功率變換器的穩(wěn)定、可靠運(yùn)行提供技術(shù)解決方案。論文完成的主要工作以及取得的成果歸類如下： ①在開關(guān)功率變換器的穩(wěn)定性分析方法上，改進(jìn)了傳統(tǒng)的雅克比(Jacobian)矩陣的求解法，所得的通用性的結(jié)果可簡化快變不穩(wěn)定行為的分析，為后面的控制參數(shù)優(yōu)化工作提供了一種理論手段。 ②結(jié)合峰值電流模式Boost PFC變換器，研究了斜坡補(bǔ)償(SC，slopecompensation)控制效果及存在的問題。應(yīng)用所提的Jacobian矩陣的求解法，導(dǎo)出斜坡補(bǔ)償控制斜率的穩(wěn)定工作范圍，為控制參數(shù)選取提供了理論選擇依據(jù)。所給的實(shí)驗(yàn)結(jié)果表明，斜坡補(bǔ)償能夠有效抑制系統(tǒng)的快變不穩(wěn)定行為，但斜坡補(bǔ)償存在補(bǔ)償度問題,降低了穩(wěn)態(tài)的電感電流峰值，從而引起過零處的電流畸變，造成原有Boost PFC變換器系統(tǒng)的功率因數(shù)惡化，，本部分研究工作闡明了傳統(tǒng)斜坡補(bǔ)償存在的問題及原因，也為后續(xù)動態(tài)斜坡補(bǔ)償策略的探索提出了一種工程實(shí)際需求。 ③針對傳統(tǒng)斜坡補(bǔ)償存在過零畸變問題，本文提出了一種零擾動動態(tài)斜坡補(bǔ)償控制策略，除了保留了原有SC的穩(wěn)定控制優(yōu)點(diǎn)外，同時(shí)改進(jìn)其不足。分別結(jié)合峰值電流單環(huán)、電壓電流雙環(huán)控制Buck變換器以及峰值電流模式Boost PFC變換器為例，構(gòu)建各自的零擾動動態(tài)補(bǔ)償控制方程，利用Jacobian矩陣的改進(jìn)求解法給出控制參數(shù)的理論工作范圍，最后給出相關(guān)的仿真和實(shí)驗(yàn)驗(yàn)證。實(shí)驗(yàn)結(jié)果表明，零擾動動態(tài)斜坡補(bǔ)償可以有效抑制系統(tǒng)存在的快變不穩(wěn)定行為，同時(shí)解決了電流的過零畸變問題，有效提高系統(tǒng)的功率因數(shù)。
[Abstract]:Switching power converter set power tube nonlinear element and a storage element, its characteristic is piecewise linear, strong coupling nonlinear characteristics, not only will inject a large amount of harmonic to the power system, and when the system parameter changes, will become unstable rich, such as harmonic oscillation and low frequency oscillation. The existence of these unstable behavior. The performance caused by the switching power converter system deterioration. Therefore, the fast change of peak current mode switching power converter (such as harmonic instability behavior of dynamic slope compensation (DSC), dynamical slope compensation) control strategy, combined with the typical DC/DC Buck converter and Boost PFC AC/DC converter as the research object, carried out theoretical analysis and experimental research, for switching power converter is stable, reliable operation to provide technical solutions in this thesis. The main work completed and the results obtained are as follows:
The stability of switching power converter analysis method, improved Jacobi (Jacobian) method for solving matrix, the general result can simplify the analysis fast unstable behavior, provides a theoretical means for the following optimization of the control parameters.
With the combination of peak current mode Boost PFC converters, the slope compensation of (SC, slopecompensation) control effect and existing problems. Solving method of Jacobian matrix using the proposed the stable working range derived slope slope compensation control, as the control parameter selection provides a theoretical basis for the selection. The experimental results show that the slope fast compensation can effectively suppress the system unstable behavior, but there are problems of slope compensation compensation degree, reduce the peak inductor current steady state, which caused the distortion of the current zero, so the power factor is the original Boost PFC converter system deteriorates, the research results of this part illustrates the problems and reasons of traditional slope compensation. Put forward a project to explore the actual needs of the subsequent dynamic slope compensation strategy.
According to the traditional slope compensation has zero crossing distortion problem, this paper proposes a zero disturbance dynamic slope compensation control strategy, in addition to retaining the advantages of stable control of the original SC, while improving its shortcomings. Combined with the peak current of single loop, voltage and current double loop control Buck converter and the peak current mode Boost PFC converter an example, to build their own zero dynamic disturbance compensation control equation, using Jacobian matrix to improve the solving method is given control parameters of the theoretical scope of work, finally gives the simulation and experiment related validation. The experimental results show that the zero disturbance dynamic slope compensation can effectively suppress the system has fast varying unstable behavior, and solves the problem of zero distortion current too, effectively improve the power factor of the system.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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