本文選題：MMC + UPQC��； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：統(tǒng)一電能質(zhì)量控制器(UPQC)是一種由有源電力濾波串、并聯(lián)混合組成的電能質(zhì)量控制裝置,既可以改善電網(wǎng)輸入電流的電能質(zhì)量,又可以改善負(fù)載電壓的電能質(zhì)量。而模塊化多電平換流器(MMC)由于集成了大量的子模塊,使用靈活,適用于電壓等級高、功率大的場合,因此,本文利用MMC的這個(gè)優(yōu)點(diǎn),嘗試就MMC型UPQC在10kV配網(wǎng)中的應(yīng)用作了一定的研究與探討,主要完成的工作及創(chuàng)新點(diǎn)包括以下幾點(diǎn):首先,介紹了電能質(zhì)量指標(biāo)的定義,在此基礎(chǔ)上綜述了UPQC的發(fā)展及研究現(xiàn)狀,并對傳統(tǒng)多電平技術(shù)進(jìn)行了介紹。第二,分析了模塊化多電平換流器的基本拓?fù)浣Y(jié)構(gòu)、物理模型,分析其基本工作原理及優(yōu)缺點(diǎn);另外,推導(dǎo)和分析其數(shù)學(xué)模型,闡述了模塊化多電平換流器的四種常見控制策略。第三,論文分析了統(tǒng)一電能質(zhì)量調(diào)節(jié)器的原理、整體功能及常見的拓?fù)浣Y(jié)構(gòu),重點(diǎn)研究了基于MMC型的UPQC。通過對拓?fù)浣Y(jié)構(gòu)中聯(lián)接方式選擇和變流器選擇的討論,建立一種可應(yīng)用于中壓配電網(wǎng)的拓?fù)浣Y(jié)構(gòu),對其工作原理進(jìn)行分析并建立其數(shù)學(xué)模型。針對MMC-UPQC在10kV配網(wǎng)系統(tǒng)中的應(yīng)用,對MMC-UPQC主電路的各元器件參數(shù)進(jìn)行研究,為設(shè)計(jì)中壓電網(wǎng)中的MMC-UPQC系統(tǒng)提供了一些參考。第四,對MMC-UPQC的控制方式進(jìn)行了研究。針對MMC-UPQC拓?fù)涞奶厥庑?應(yīng)用基于dq坐標(biāo)變換的檢測算法進(jìn)行分析。在控制算法上,提出在串聯(lián)側(cè)采用開環(huán)反饋電壓的控制方式;在并聯(lián)側(cè)采用電壓外環(huán)、電流內(nèi)環(huán)解耦的控制方式。最后,論文對所研究的內(nèi)容給出了仿真及實(shí)驗(yàn)。在PSCAD/EMTDC仿真軟件環(huán)境下搭建了仿真模型,針對UPQC的控制策略以及拓?fù)浣Y(jié)構(gòu)進(jìn)行仿真和分析,驗(yàn)證其對電壓暫降/暫升以及電流諧波、無功、負(fù)序的補(bǔ)償功能的有效性。最后,基于RTDS平臺,針對MMC型UPQC主電路拓?fù)浣Y(jié)構(gòu)、控制保護(hù)柜的功能進(jìn)行數(shù)字-物理閉環(huán)實(shí)驗(yàn),驗(yàn)證了其功能的有效性。
[Abstract]:Unified Power quality Controller (UPQC) is a kind of power quality control device which is composed of active power filter string and parallel connection. It can not only improve the power quality of input current but also improve the power quality of load voltage.The modular multilevel converter (MMC), which integrates a large number of sub-modules, is flexible and suitable for high voltage level and high power situations. Therefore, this paper makes use of this advantage of MMC.This paper attempts to study and discuss the application of MMC type UPQC in 10kV distribution network. The main work and innovations are as follows: firstly, the definition of power quality index is introduced, and the development and research status of UPQC is summarized.The traditional multi-level technology is also introduced.Secondly, the basic topology, physical model, basic working principle, advantages and disadvantages of modularized multilevel converter are analyzed, in addition, its mathematical model is deduced and analyzed.Four common control strategies of modularized multilevel converter are described.Thirdly, the paper analyzes the principle, the whole function and the common topology of the unified power quality regulator, and focuses on the research of the UPQC based on MMC.Through the discussion of the choice of connection mode and converter in topology structure, a kind of topology structure which can be applied to medium voltage distribution network is established, and its working principle is analyzed and its mathematical model is established.Aiming at the application of MMC-UPQC in 10kV distribution system, the main circuit parameters of MMC-UPQC are studied, which provides some references for the design of MMC-UPQC system in medium voltage power network.Fourthly, the control mode of MMC-UPQC is studied.Aiming at the particularity of MMC-UPQC topology, the detection algorithm based on dq coordinate transformation is applied to analyze.In the control algorithm, the open-loop feedback voltage is used in the series side and the voltage outer loop and the current inner loop are decoupled in the parallel side.At last, the simulation and experiment are given.In the environment of PSCAD/EMTDC simulation software, the simulation model is built, and the control strategy and topology of UPQC are simulated and analyzed to verify the effectiveness of the compensation function of voltage sag / surge and current harmonics, reactive power and negative sequence.Finally, based on the RTDS platform, the digital physical closed-loop experiment of the function of the MMC type UPQC main circuit topology and the function of the control protection cabinet is carried out, which verifies the effectiveness of the function.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46;TM711

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本文編號：1748499