【摘要】：近年來,我國(guó)經(jīng)濟(jì)高速發(fā)展,社會(huì)電氣化水平持續(xù)提高,國(guó)家整體電力需求呈現(xiàn)高速增長(zhǎng)。然而,從我國(guó)的能源稟賦來講,無論是傳統(tǒng)的化石能源還是新興的清潔能源,其主要分布均位于西南部地區(qū),而我國(guó)能源需求的重心則位于中東部地區(qū)。因此,在中國(guó)這樣一個(gè)幅員遼闊、經(jīng)濟(jì)高速發(fā)展的大國(guó)中,高壓交直流輸電必將獲得快速發(fā)展。一方面,相比與交流輸電系統(tǒng),高壓直流輸電系統(tǒng)具有輸送容量大、線路走廊窄、靈活性強(qiáng)、運(yùn)行經(jīng)濟(jì)環(huán)保等優(yōu)點(diǎn),適合應(yīng)用于大功率、遠(yuǎn)距離輸電的場(chǎng)合;另一方面,高壓直流輸電技術(shù)可以實(shí)現(xiàn)大區(qū)電網(wǎng)異步互聯(lián),增強(qiáng)風(fēng)能、太陽能等清潔能源的并網(wǎng)消納能力,提高電力系統(tǒng)的穩(wěn)定性。模塊化多電平換流器高壓直流輸電系統(tǒng)(MMC-HVDC)作為一種極具發(fā)展前景的輸電方式,已經(jīng)在很多工程實(shí)際中得到了應(yīng)用。MMC換流站模塊化的拓?fù)浣Y(jié)構(gòu)決定了其可應(yīng)用容量較小的電力電子器件實(shí)現(xiàn)很高的電壓等級(jí)和功率水平;電平數(shù)較多,輸出波形畸變小,無需加裝交流濾波裝置,可實(shí)現(xiàn)冗余控制;系統(tǒng)損耗小,無功功率可控,開關(guān)頻率可控;具有更好的穩(wěn)態(tài)和暫態(tài)性能。MMC-HVDC采用子模塊級(jí)聯(lián)結(jié)構(gòu),這種含有大量器件的模塊化結(jié)構(gòu)也帶來了相應(yīng)的控制問題,例如,平穩(wěn)的預(yù)充電與啟動(dòng)環(huán)節(jié),子模塊電容電壓均衡控制,相間環(huán)流的抑制以及需要比低電平VSC-HVDC更復(fù)雜的故障保護(hù)策略。因此,MMC-HVDC的優(yōu)化控制是當(dāng)前研究的一大熱點(diǎn),專家學(xué)者們提出了很多具有優(yōu)良特性的控制算法。本文從以下兩方面對(duì)MMC-HVDC的優(yōu)化控制進(jìn)行研究:一方面利用二階廣義積分器(DSOGI-QSG)進(jìn)行網(wǎng)側(cè)交流電壓的估算,提高鎖相環(huán)節(jié)與電壓測(cè)量環(huán)節(jié)的精度與可靠性;另一方面采用改進(jìn)的模型預(yù)測(cè)方法來減少預(yù)測(cè)環(huán)節(jié)的計(jì)算量,使模型預(yù)測(cè)方法可以用于更多電平的MMC-HVDC系統(tǒng)。最后,在PSCAD/EMTDC仿真實(shí)驗(yàn)平臺(tái)上對(duì)所提方法進(jìn)行了驗(yàn)證,仿真結(jié)果顯示所提方法有良好的動(dòng)態(tài)響應(yīng),能夠達(dá)到預(yù)期的控制目標(biāo)。
[Abstract]:In recent years, with the rapid development of our economy, the level of social electrification continues to improve, and the overall power demand of the country is growing at a high speed. However, in terms of the energy endowment of our country, both the traditional fossil energy and the emerging clean energy are mainly distributed in the southwest region, and the center of energy demand in China lies in the central and eastern regions. Therefore, high voltage AC / DC transmission is bound to develop rapidly in a large country with a vast territory and rapid economic development. On the one hand, compared with AC transmission system, HVDC system has the advantages of large transmission capacity, narrow line corridor, strong flexibility, economic and environmental protection and so on. On the other hand, it is suitable for high power and long distance transmission. High voltage direct current (HVDC) transmission technology can realize asynchronous interconnection of large area power grid, enhance the grid and absorption capacity of clean energy, such as wind energy and solar energy, and improve the stability of power system. Modular multilevel converter high voltage direct current transmission system (MMC-HVDC) as a very promising transmission mode, The modularization topology structure of MMC converter station determines that the power electronic devices with small capacity can be used to achieve high voltage level and power level, the number of level is more, and the distortion of output waveform is small. Without adding AC filter device, redundant control can be realized; system loss is small, reactive power is controllable, switching frequency is controllable; and better steady-state and transient performance is achieved. MMC-HVDC adopts submodule cascade structure. This modular structure with a large number of devices also brings about the corresponding control problems, such as steady precharge and startup, capacitor voltage equalization control of sub-modules. The suppression of interphase circulation and the need for a more complex fault protection strategy than low level VSC-HVDC. Therefore, the optimization control of MMC-HVDC is a hot topic in the current research. Many control algorithms with excellent characteristics have been proposed by experts and scholars. In this paper, the optimal control of MMC-HVDC is studied in the following two aspects: on the one hand, the second order generalized integrator (DSOGI-QSG) is used to estimate the AC voltage on the grid side to improve the accuracy and reliability of PLL and voltage measurement; On the other hand, the improved model prediction method is used to reduce the computational complexity of the prediction link, so that the model prediction method can be used in multi-level MMC-HVDC systems. Finally, the proposed method is verified on the PSCAD/EMTDC simulation platform. The simulation results show that the proposed method has a good dynamic response and can achieve the desired control objectives.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 高燃;賈鳳鳴;廖羽晗;束暢;朱雨晨;陳鵬程;;電壓源換流器技術(shù)的最新發(fā)展及其在柔性交流輸電系統(tǒng)領(lǐng)域中的應(yīng)用[J];高壓電器;2016年11期

2 孫強(qiáng);王莎莎;魏克新;高成海;;采用比例諧振調(diào)節(jié)器的三相VSC控制系統(tǒng)穩(wěn)定性研究[J];高電壓技術(shù);2016年10期

3 張占鋒;樊艷芳;王一波;王環(huán);;基于雙二階廣義積分鎖頻環(huán)的光伏并網(wǎng)發(fā)電系統(tǒng)仿真研究[J];可再生能源;2016年08期

4 湯廣福;龐輝;賀之淵;;先進(jìn)交直流輸電技術(shù)在中國(guó)的發(fā)展與應(yīng)用[J];中國(guó)電機(jī)工程學(xué)報(bào);2016年07期

5 孫強(qiáng);魏克新;王莎莎;杜吉飛;高成海;;PWM變換器在矢量旋轉(zhuǎn)坐標(biāo)系下比例諧振控制策略及其魯棒性設(shè)計(jì)[J];中國(guó)電機(jī)工程學(xué)報(bào);2016年05期

6 梁營(yíng)玉;張濤;劉建政;楊奇遜;梅紅明;劉樹;;模型預(yù)測(cè)控制在MMC-HVDC中的應(yīng)用[J];電工技術(shù)學(xué)報(bào);2016年01期

7 王朝亮;許建中;趙成勇;趙鵬豪;宗波;;基于單箝位型子模塊的MMC及拓?fù)涓倪M(jìn)方案[J];電力自動(dòng)化設(shè)備;2015年09期

8 許建中;李承昱;熊巖;姬煜軻;趙成勇;安婷;;模塊化多電平換流器高效建模方法研究綜述[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年13期

9 趙國(guó)亮;趙鵬豪;趙成勇;許建中;李衛(wèi)國(guó);;模塊化多電平換流器子模塊拓?fù)浣Y(jié)構(gòu)對(duì)比分析[J];華北電力大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年03期

10 吳德會(huì);李钷;;基于FCS-MPC的電壓跟蹤調(diào)制方法[J];電力自動(dòng)化設(shè)備;2015年03期

相關(guān)博士學(xué)位論文 前4條

1 辛業(yè)春;基于MMC的高壓直流輸電系統(tǒng)控制策略研究[D];華北電力大學(xué);2015年

2 范聲芳;模塊化多電平變換器（MMC）若干關(guān)鍵技術(shù)研究[D];華中科技大學(xué);2014年

3 胡靜;基于MMC的多端直流輸電系統(tǒng)控制方法研究[D];華北電力大學(xué);2013年

4 陳海榮;交流系統(tǒng)故障時(shí)VSC-HVDC系統(tǒng)的控制與保護(hù)策略研究[D];浙江大學(xué);2007年

，

本文編號(hào)：2265918