【摘要】：現(xiàn)代電力電子技術(shù)朝著高頻化、模塊化、數(shù)字化的方向發(fā)展,高頻化u可以減小濾波器的參數(shù),降低變壓器的體積,同時(shí)也使開關(guān)損耗增大,電路效率大幅降低。高頻諧振軟開關(guān)變換器解決了開關(guān)損耗和開關(guān)噪聲的問題,但它通常是一個(gè)強(qiáng)非線性系統(tǒng),其諧振過程分析和電路參數(shù)設(shè)計(jì)非常繁瑣,所以對高頻諧振軟開關(guān)變換器的精確數(shù)學(xué)模型的研究越來越迫切。本文結(jié)合某公司高壓直流電源的研發(fā),著重研究串聯(lián)諧振變換器的時(shí)域建模法和控制技術(shù)。主要內(nèi)容包括以下幾個(gè)方面:在分析了國內(nèi)外的高頻諧振軟開關(guān)變換器的常用拓?fù)浜涂刂品椒ǖ幕A(chǔ)上,選用串聯(lián)諧振變換器作為主電路拓?fù)�。利用諧振電流通過二極管續(xù)流或者斷續(xù)時(shí)開通和關(guān)斷IGBT,實(shí)現(xiàn)零電壓開通(ZVS)和零電流關(guān)斷(ZCS)。高頻高壓變壓器是串聯(lián)諧振變換器的重要組件,分析高頻高壓變壓器的等效模型,并對變壓器的漏感和分布電容進(jìn)行研究,分析它們對電路拓?fù)涞挠绊懞鸵种品椒?提供一種漏感和分布電容的測量方法。串聯(lián)諧振變換器具有不同的工作模式,分析開關(guān)頻率大于諧振頻率的工作模式和諧振過程,推導(dǎo)建立不同諧振子周期的數(shù)學(xué)描述方程并進(jìn)行仿真驗(yàn)證,研究開關(guān)頻率的變化對輸出電壓的影響,繪制諧振電流和諧振電容電壓的穩(wěn)態(tài)軌跡。分析開關(guān)頻率小于諧振頻率的工作模式,比較分析不同品質(zhì)因數(shù)Q對諧振電流續(xù)流的影響。基于時(shí)域模型分析諧振參數(shù)設(shè)計(jì)方法和變頻調(diào)控技術(shù),編寫控制算法,搭建實(shí)驗(yàn)平臺,結(jié)合硬件進(jìn)行調(diào)試和實(shí)驗(yàn)驗(yàn)證。實(shí)驗(yàn)結(jié)果與理論分析一致。
[Abstract]:Modern power electronics technology is developing towards high frequency, modularization and digitization. High frequency u can reduce the parameters of filter, reduce the volume of transformer, increase the switching loss and reduce the circuit efficiency. High frequency resonant soft switching converter solves the problem of switching loss and switching noise, but it is usually a strong nonlinear system, and its resonant process analysis and circuit parameter design are very complicated. Therefore, it is more and more urgent to study the precise mathematical model of high frequency resonant soft switching converter. In this paper, the time domain modeling method and control technology of series resonant converter are studied in combination with the research and development of HVDC power supply in a company. The main contents are as follows: on the basis of analyzing the common topologies and control methods of high frequency resonant soft switching converters at home and abroad, series resonant converters are selected as the main circuit topology. Realization of Zero-Voltage turn-on (ZVS) and Zero-Current turn-off (ZCS). Using resonant current through Diode continuous current or on and off IGBT, High frequency high voltage transformer is an important component of series resonant converter. The equivalent model of high frequency high voltage transformer is analyzed. The leakage inductance and distributed capacitance of transformer are studied, and their influence on circuit topology and suppression method are analyzed. A method for measuring leakage inductance and distributed capacitance is provided. The series resonant converter has different working modes. The operating mode and the resonant process of the switching frequency greater than the resonant frequency are analyzed, and the mathematical description equations of different harmonic oscillator periods are derived and verified by simulation. The influence of switching frequency on output voltage is studied, and the steady state trajectory of resonant current and resonant capacitor voltage is plotted. The operation mode of switching frequency less than the resonant frequency is analyzed, and the influence of different quality factors Q on the resonant current continuation is compared and analyzed. Based on the time-domain model, the resonant parameter design method and frequency conversion control technology are analyzed, the control algorithm is compiled, the experimental platform is built, and the hardware is used to debug and verify the experiment. The experimental results are consistent with the theoretical analysis.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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