【摘要】：本文以新能源中風(fēng)能的利用為研究背景,以微型分布式風(fēng)力發(fā)電系統(tǒng)中的直流模塊為研究對象。通過對文獻(xiàn)的大量閱讀,了解寬范圍的DC/DC變換器的研究現(xiàn)狀,針對微型分布式風(fēng)力發(fā)電系統(tǒng)的特點給出了LLC諧振變換器作為其直流模塊的設(shè)計方案。 首先通過對LLC諧振變換器原邊開關(guān)管實現(xiàn)軟開關(guān)的條件進(jìn)行分析,提出了一種能夠滿足全范圍滿載實現(xiàn)ZVS的LLC勵磁電感優(yōu)化設(shè)計方法,并結(jié)合增益特性利用仿真手段完成諧振電感與電容設(shè)計優(yōu)化變換器效率。給出了電路關(guān)鍵參數(shù)的選型與設(shè)計,分析了電路損耗,并制作一臺300VA全橋升壓型LLC樣機完成實驗驗證。 對于LLC閉環(huán)設(shè)計,LLC的小信號分析是必不可少的,本文采用了擴展描述函數(shù)建立了完全諧振點處LLC的小信號模型,最后通過比較分析以及實驗驗證了模型建立的準(zhǔn)確性。 針對LLC諧振變換器在微型分布式風(fēng)力發(fā)電系統(tǒng)中的應(yīng)用,本文給出了詳細(xì)以全橋倍壓型LLC為拓?fù)浣Y(jié)構(gòu)的設(shè)計方案。討論了包含最大功率跟蹤MPPT控制在內(nèi)的系統(tǒng)DSP數(shù)字化控制策略；給出了軟啟動策略、風(fēng)機電子剎車系統(tǒng)在內(nèi)的系統(tǒng)軟硬件保護(hù)的解決方案,并最終根據(jù)風(fēng)力發(fā)電HUB項目要求制作一臺500VA的樣機以驗證系統(tǒng)方案設(shè)計的可行性。 最后對本課題進(jìn)行了總結(jié)與進(jìn)一步的展望。
[Abstract]:In this paper, the use of new energy stroke energy as the research background, the DC module in the micro distributed wind power generation system as the research object. Based on a large number of literatures, the research status of wide range DC / DC converters is studied. According to the characteristics of micro distributed wind power system, the design scheme of LLC resonant converter as its DC module is presented. Firstly, by analyzing the condition of realizing soft switch in LLC resonant converter, an optimal design method of LLC excitation inductor is proposed, which can meet the full load of ZVS. The resonant inductance and capacitance are designed and optimized by using the gain characteristic. The selection and design of the key parameters of the circuit are given, the circuit loss is analyzed, and a 300VA full-bridge booster LLC prototype is made to complete the experimental verification. Small signal analysis of LLC is necessary for LLC closed-loop design. In this paper, an extended description function is used to establish a small signal model of LLC at a full resonance point. Finally, the accuracy of the model is verified by comparison, analysis and experiments. Aiming at the application of LLC resonant converter in micro distributed wind power generation system, this paper presents a detailed design scheme with full bridge voltage doubling type LLC as the topology. The digital control strategy of DSP, including MPPT control with maximum power tracking, is discussed, and the solution of soft start strategy and system hardware and software protection including fan electronic brake system is given. Finally, a 500VA prototype is made according to wind power Hub project to verify the feasibility of the system design. Finally, the paper summarizes and prospects the subject.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46;TM614

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