本文選題：混合　切入點：高壓直流　出處：《華北電力大學(xué)》2014年碩士論文

【摘要】：傳統(tǒng)高壓直流輸電(LCC-HVDC)方式因其具有大功率遠距離輸電的特點已獲得廣泛應(yīng)用,然而由于采用的是半控電力電子器件,系統(tǒng)在運行中會吸收大量的無功功率,且易發(fā)生換相失敗。隨著電力電子器件的發(fā)展,輕型直流輸電(VSC-HVDC)顯示出了功率可以獨立調(diào)控的特點,可以向弱系統(tǒng)或無源網(wǎng)絡(luò)供電,但換流器造價較高。將傳統(tǒng)高壓直流輸電和輕型直流輸電結(jié)合起來的混合直流輸電,具有電壓源換流器的獨立控制有功和無功功率等優(yōu)點,也能保證相對輕型直流輸電更好的經(jīng)濟性。混合直流輸電適用于新能源并網(wǎng)領(lǐng)域中,本文針對風(fēng)力發(fā)電,首先提出了基于直驅(qū)風(fēng)機(direct-drive permanent magnet synchronous generators)的海上風(fēng)電經(jīng)混合直流輸電送出的拓撲結(jié)構(gòu)：風(fēng)電場側(cè)換流器為電網(wǎng)換相換流器(Line-Commutated-Converter,LCC),網(wǎng)側(cè)換流器為電壓源換流器(Voltage Source Converter,VSC),并對此模型在PSCAD仿真軟件中進行了故障分析,在所有的故障情況下系統(tǒng)皆能在故障消失后恢復(fù)正常運行。針對雙饋風(fēng)機,提出了基于雙饋風(fēng)機(double fed induction generator,DFIG)的海上風(fēng)電經(jīng)混合直流輸電送出的拓撲結(jié)構(gòu)：風(fēng)電場側(cè)換流器為電壓源換流器,網(wǎng)側(cè)換流器為電網(wǎng)換相換流器。基于上述拓撲提出了輸電系統(tǒng)能夠最大程度將風(fēng)能送到電網(wǎng)的協(xié)調(diào)控制策略,由于逆變側(cè)為LCC,易發(fā)生換相失敗,提出逆變側(cè)為弱系統(tǒng)時發(fā)生接地故障時減少換相失敗次數(shù)的改進控制策略。最后在PSCAD仿真軟件中模擬了基于DFIG的海上風(fēng)電利用混合直流送出電能,仿真結(jié)果驗證了網(wǎng)側(cè)換流站控制系統(tǒng)的良好的功率跟蹤能力以及在交流側(cè)故障時改進控制策略能夠抑制換相失敗的次數(shù)。這兩種風(fēng)電送出的結(jié)構(gòu),能夠很好的綜合傳統(tǒng)直流和輕型直流的優(yōu)點,對于海上風(fēng)電的直流送出有很好的應(yīng)用前景。
[Abstract]:Traditional high voltage direct current transmission (HVDC) LCC-HVDCmode has been widely used because of its characteristics of high power long-distance transmission. However, because of the use of semi-controlled power electronic devices, the system will absorb a large amount of reactive power in operation. With the development of power electronic devices, VSC-HVDCA shows that the power can be controlled independently, and can supply power to weak system or passive network. But the cost of converter is high. The hybrid DC transmission which combines traditional HVDC transmission and light HVDC transmission has the advantages of independent control of active power and reactive power of voltage source converter. Hybrid DC transmission can be used in the field of new energy grid connection, this paper aims at wind power generation. Firstly, the topology of offshore wind power through hybrid DC transmission based on direct-drive permanent magnet synchronous generators is proposed: the wind farm side converter is the power grid commutated-converter LCCs, the net-side converter is the voltage source converter voltage Source converter VSCS, and for this purpose, the wind farm side converter is the power grid commutated-converter and the grid side converter is the voltage source converter. The fault analysis of the model is carried out in the PSCAD simulation software. In all cases of failure, the system can resume normal operation after the fault has disappeared. For doubly-fed fan, The topology of offshore wind power through hybrid DC transmission based on doubly-fed fan double fed induction generator is presented. The wind farm side converter is a voltage source converter. The grid-side commutator is the commutator of the power grid. Based on the above topology, a coordinated control strategy for the transmission system to maximize wind power to the power grid is proposed. Because the inverter side is LCC-prone to commutation failure, An improved control strategy is proposed to reduce the frequency of commutation failure when the inverter side is a weak system. Finally, the hybrid DC power generation from offshore wind power based on DFIG is simulated in PSCAD simulation software. The simulation results show that the good power tracking ability of the control system and the improvement of control strategy in AC side fault can restrain the frequency of commutation failure. It can integrate the advantages of traditional DC and light DC, and has a good application prospect for offshore wind power supply.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1

【參考文獻】

相關(guān)期刊論文 前10條

1 周宏林;楊耕;耿華;;遠距離大型DFIG風(fēng)電場的混合型HVDC建模及控制[J];電工技術(shù)學(xué)報;2010年12期

2 張照彥;馬永光;;雙饋異步風(fēng)力發(fā)電機建模與仿真研究[J];電力科學(xué)與工程;2010年01期

3 楊思祥;李國杰;阮思燁;董健;;應(yīng)用于DFIG風(fēng)電場的VSC-HVDC控制策略[J];電力系統(tǒng)自動化;2007年19期

4 羅隆福;雷園園;李勇;張俊華;鄧淑娟;;定熄弧角控制器對直流輸電系統(tǒng)的影響分析[J];電力系統(tǒng)及其自動化學(xué)報;2009年05期

5 周宏林;楊耕;;大型DFIG風(fēng)電場的LCC-HVDC并網(wǎng)及控制[J];電力自動化設(shè)備;2009年07期

6 朱金鳳;;“直驅(qū)VS雙饋”:風(fēng)機主流技術(shù)大比拼[J];電氣制造;2010年09期

7 李天偉;;變速恒頻風(fēng)力發(fā)電技術(shù)研究[J];電子制作;2013年14期

8 袁旭峰;程時杰;;多端直流輸電技術(shù)及其發(fā)展[J];繼電器;2006年19期

9 趙成勇;孫營;李廣凱;;雙饋入直流輸電系統(tǒng)中VSC-HVDC的控制策略[J];中國電機工程學(xué)報;2008年07期

10 耿華;許德偉;吳斌;楊耕;;永磁直驅(qū)變速風(fēng)電系統(tǒng)的控制及穩(wěn)定性分析[J];中國電機工程學(xué)報;2009年33期

，

本文編號：1660865