本文選題：模塊化多電平換流器 + 控制系統(tǒng)設(shè)計(jì)��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：基于MMC換流器的模塊化多電平直流輸電系統(tǒng)(MMC-HVDC)對功率器件的要求低,具有良好的可擴(kuò)展性,可以方便地?cái)U(kuò)展到很高的電壓等級和功率水平。此外MMC-HVDC采用IGBT等可關(guān)斷器件,沒有換相失敗問題,具有更強(qiáng)的可控性和靈活性,在大容量遠(yuǎn)距離輸電、風(fēng)力發(fā)電等清潔能源并網(wǎng)、改善電能質(zhì)量等方面具有廣闊的應(yīng)用前景,是解決現(xiàn)代電網(wǎng)諸多挑戰(zhàn)的重要手段之一。首先,本文詳細(xì)研究了MMC的數(shù)學(xué)模型,包括開關(guān)模型、平均值模型以及小信號模型,并給出了這些數(shù)學(xué)模型的詳細(xì)推導(dǎo)過程。通過引入開關(guān)函數(shù),得出橋臂電壓、電流狀態(tài)方程;利用開關(guān)周期平均算子,將橋臂狀態(tài)方程平均化得到開關(guān)周期平均模型;在此基礎(chǔ)上,推導(dǎo)出MMC換流器的小信號模型。通過仿真和實(shí)驗(yàn)分別研究了使用外部電源的逐模塊充電方法。針對逐模塊充電方法的不足之處,分析了適用于模塊化多電平逆變器的交流電源充電方法,并給出了仿真和實(shí)驗(yàn)結(jié)果。其次,詳細(xì)研究了MMC換流站控制策略以及子模塊電容電壓均壓控制策略,并依據(jù)自動控制理論,給出了控制器參數(shù)的詳細(xì)設(shè)計(jì)步驟。基于連續(xù)數(shù)學(xué)模型,推導(dǎo)出MMC-HVDC換流站級控制系統(tǒng)結(jié)構(gòu),并對優(yōu)化后的雙閉環(huán)控制系統(tǒng)中相關(guān)控制器主要參數(shù)的設(shè)計(jì)方法進(jìn)行了深入研究。采用前饋-反饋控制和穩(wěn)態(tài)逆模型相結(jié)合,使控制系統(tǒng)具有優(yōu)越的穩(wěn)態(tài)和暫態(tài)響應(yīng)特性。時(shí)域仿真結(jié)果表明,本文推導(dǎo)的控制系統(tǒng)結(jié)構(gòu)及其參數(shù)設(shè)計(jì)方法應(yīng)用于MMC型輕型直流輸電系統(tǒng)時(shí),系統(tǒng)具有良好的穩(wěn)態(tài)和暫態(tài)特性。最后,研制了一套三相模塊化多電平逆變器的實(shí)驗(yàn)平臺。從硬件設(shè)計(jì)和軟件設(shè)計(jì)兩個(gè)方面詳細(xì)介紹MMC實(shí)驗(yàn)平臺的設(shè)計(jì)過程。首先給出了實(shí)驗(yàn)平臺的總體設(shè)計(jì)思路,重要硬件電路框圖和軟件流程圖。在此基礎(chǔ)上研制了一臺小功率三相實(shí)驗(yàn)平臺并對實(shí)驗(yàn)結(jié)果進(jìn)行了相應(yīng)的分析。實(shí)驗(yàn)結(jié)果證明了本文研究結(jié)論的正確性,為后續(xù)進(jìn)一步的研究打下了堅(jiān)實(shí)的基礎(chǔ)。
[Abstract]:The modularized multilevel HVDC system based on MMC converter has low requirements for power devices and good scalability, and can be easily extended to high voltage levels and power levels. In addition, MMC-HVDC uses IGBT and other turn-off devices, which has no commutation failure problem, has stronger controllability and flexibility, and has a broad application prospect in connection to clean energy sources such as large capacity long-distance transmission, wind power generation, and improving power quality, etc. It is one of the important means to solve many challenges of modern power grid. Firstly, the mathematical models of MMC, including switching model, average value model and small signal model, are studied in detail, and the derivation process of these mathematical models is given in detail. By introducing the switching function, the voltage and current state equations of the bridge arm are obtained. By using the switching cycle averaging operator, the switching cycle average model is obtained. On this basis, the small signal model of the MMC converter is derived. Through simulation and experiment, the charging method of module by module using external power supply is studied respectively. Aiming at the shortcomings of the modular charging method, the charging method of AC power supply suitable for modularized multilevel inverter is analyzed, and the simulation and experimental results are given. Secondly, the control strategy of MMC converter station and the voltage sharing control strategy of submodule capacitive voltage are studied in detail. According to the automatic control theory, the detailed design steps of controller parameters are given. Based on the continuous mathematical model, the structure of MMC-HVDC converter station level control system is derived, and the design method of the main parameters of the related controller in the optimized double closed loop control system is studied. The feedforward and feedback control is combined with the steady-state inverse model to make the control system have superior steady-state and transient response characteristics. The time domain simulation results show that the proposed control system structure and its parameter design method have good steady-state and transient characteristics when applied to MMC HVDC system. Finally, a set of three-phase modularized multilevel inverter is developed. The design process of MMC experimental platform is introduced in detail from two aspects: hardware design and software design. At first, the general design idea, important hardware circuit block diagram and software flow chart of the experiment platform are given. On this basis, a small power three-phase experimental platform is developed and the experimental results are analyzed accordingly. The experimental results prove the correctness of this study and lay a solid foundation for further research.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM721.1

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