數(shù)字控制雙向全橋dc-dc變換器的研究碩士學(xué)位論文(已修改)

　

【正文】 碩 士 學(xué) 位 論 文數(shù)字控制雙向全橋 DC/DC 變換器的研究A Thesis Submitted in Partial Fulfillment of the Requirements For the Degree of Master of EngineeringA Study of Bidirectional FullBridge DC/DC Converter Based on Digital ControlCandidate : Niu Jin HongMajor: Power Electronics and Electric DriveSupervisor: Prof. Kang Yong Huazhong University of Science and TechnologyWuhan, Hubei . China 430074April, 2022獨 創(chuàng) 性 聲 明 本人聲明所呈交的學(xué)位論文是我個人在導(dǎo)師指導(dǎo)下進行的研究工作及取得的研究成果。盡我所知，除文中已經(jīng)標明引用的內(nèi)容外，本論文不包含任何其他個人或集體已經(jīng)發(fā)表或撰寫過的研究成果。對本文的研究做出貢獻的個人和集體，均已在文中以明確方式標明。本人完全意識到本聲明的法律結(jié)果由本人承擔(dān)。 學(xué)位論文作者簽名： 日期： 年 月 日學(xué)位論文版權(quán)使用授權(quán)書 本學(xué)位論文作者完全了解學(xué)校有關(guān)保留、使用學(xué)位論文的規(guī)定，即：學(xué)校有權(quán)保留并向國家有關(guān)部門或機構(gòu)送交論文的復(fù)印件和電子版，允許論文被查閱和借閱。本人授權(quán)華中科技大學(xué)可以將本學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進行檢索，可以采用影印、縮印或掃描等復(fù)制手段保存和匯編本學(xué)位論文。 保密□ ，在_____年解密后適用本授權(quán)書。本論文屬于 不保密□。（請在以上方框內(nèi)打“√” ） 學(xué)位論文作者簽名： 指導(dǎo)教師簽名：日期： 年 月 日 日期： 年 月 日I摘 要雙向 DC/DC 變換器(Bidirectional DC/DC Converter, BDC)是可雙象限運行的直流直流變換器。該變換器能夠根據(jù)實際需要調(diào)節(jié)能量的流動方向，在功能上相當于兩個單向直流直流變換器。隨著科技和生產(chǎn)的發(fā)展，對雙向 DC/DC 變換器的需求逐漸增多，主要有直流不停電電源系統(tǒng)、航天電源系統(tǒng)、電動汽車等應(yīng)用場合。在需要能量雙向流動的場合，雙向 DC/DC 變換器的應(yīng)用可大幅度減輕系統(tǒng)的體積重量和成本，有重要的研究價值。本文主要研究適用于中大功率場合的數(shù)字控制隔離型雙向全橋 DC/DC 變換器。本文首先在介紹雙向 DC/DC 變換器的概念、構(gòu)成方法的基礎(chǔ)上引出雙向全橋DC/DC 變換器，該變換器變壓器高壓側(cè)為電壓型全橋結(jié)構(gòu)，接直流母線；低壓側(cè)為電流型全橋結(jié)構(gòu)，接蓄電池。接著介紹雙向全橋 DC/DC 變換器的工作原理，該變換器有兩種工作模式：充電模式時，高壓側(cè)開關(guān)管有驅(qū)動信號，低壓側(cè)開關(guān)管驅(qū)動信號封鎖，工作原理與單向全橋 DC/DC 變換器類似；放電模式時低壓側(cè)開關(guān)管有驅(qū)動信號，高壓側(cè)開關(guān)管驅(qū)動信號封鎖，工作原理與 Boost 型全橋 DC/DC 變換器類似。同時分析了變換器工作過程中存在的占空比損失、開關(guān)管電壓尖鋒、啟動控制等問題及相應(yīng)的解決方案。然后用狀態(tài)空間平均法建立變換器的小信號模型，研究雙向全橋 DC/DC 變換器的控制模型，分析變換器的閉環(huán)系統(tǒng)穩(wěn)定性，并給出單閉環(huán) PID 控制器的設(shè)計方法。最后給出一臺 200W 雙向全橋 DC/DC 變換器系統(tǒng)設(shè)計、軟件流程、數(shù)字 PID 控制器的實現(xiàn)方法、及實驗結(jié)果與分析。關(guān)鍵詞：雙向全橋 DC/DC 變換器 充電模式 放電模式 控制模型 數(shù)字 PID 控制IIAbstractBidirectional DC/DC Converter (BDC) is the twoquadrant operating DC/DC converter. The power can flow in either direction between two DC sources. BDC performs as two DC/DC converters. With the development of the science and production, BDC is increasingly used in applications such as DC uninterruptible power supply, aerospace power supply, and auxiliary power supply of electric vehicles, etc. The employing of BDC can reduce the size, the weight, and the cost of power system. This thesis is concentrated on the research of the digital controlled Bidirectional, isolated, fullbridge DC/DC Converter. This converter is usally used in high power applications.In chapter one, the conception, creation of the bidirectional DC/DC converter are presented, and the bidirectional, isolated, fullbridge DC/DC converter is proposed. The converter is operated with dual fullbridges placed on each side of the isolated transformer. The high voltage (HV) side is connected to the dc generator supply, and the low voltage (LV) side is connected to the battery. In chapter two, the operating principle of the bidirectional fullbridge DC/DC converter is introduced. When power flows from the HVside to the LVside, the converter works in buck/charge mode to charge the LVside battery, and the switching signal on HVside is turned on, on LVside is locked。 otherwise, it works in boost/discharge mode to power the HVside load, and the switching signal on LVside is turned on, on HVside is locked. Charge mode works as isolated fullbridge DC/DC converter, and the discharge mode works as isolated fullbridge boost converter. Chapter two also proposed some problems and the solved methods, such as the loss of duty ratio, voltage spike, startup controlling, etc. In chapter three, an extended statespace averaged model is developed to build the small signal model of the converter in both directions of power flow. A PID controller is designed to make the system has a satisfactory transient response against the disturbance.Finally, a 200W prototype has been built. The design of hardware and software, realization of digital PID controller, etc are introduced in detail. The experimental results of the converter are proposed to confirm the theory analysis.Keywords: Bidirectional Fullbridge DC/DC Converter Charge ModeDischarge Mode Controller Model Digital PID ControllerIII目 錄摘要 ....................................................................................................................IAbstract ............................................................................................................II1 緒論 雙向 DC/DC 變換器概述 ......................................................................(1) 雙向 DC/DC 變換器的應(yīng)用 ..................................................................(5) 雙向 DC/DC 變換器的現(xiàn)狀和發(fā)展 ......................................................(7) 本文的研究意義和主要工作 ................................................................(9)2 雙向全橋 DC/DC 變換器 引言 ......................................................................................................(11) 雙向全橋 DC/DC 變換器的工作原理 ................................................(11) 開關(guān)管電壓 尖峰問題 ..........................................................................(24) 雙向全橋 DC/DC 變換器的啟動控制 ................................................(26) 本章小結(jié) ..............................................................................................(31)3 雙向全橋 DC/DC 變換器控制模型的研究 引言 ......................................................................................................(32) 非隔離型雙向 BuckBoost 變換器的小信號模型 .............................(32) 雙向全橋 DC/DC 變換器小信號模型的建立 ....................................(41) 小信號模型穩(wěn)定性分析 ......................................................................(42) 本章小結(jié) ..............................................................................................(47)4 雙向全橋 DC/DC 變換器的系統(tǒng)設(shè)計 引言 ......................................................................................................(48) 主電路參數(shù)設(shè)計 ....................