【摘要】：海上風(fēng)電產(chǎn)業(yè)的蓬勃發(fā)展為解決能源危機(jī)提供了重要保障，其中基于電壓源型換流器的柔性直流輸電技術(shù)(Voltage Source Converter-Based HVDC, VSC-HVDC)以高效、靈活及可控性強(qiáng)等優(yōu)勢(shì)在海上風(fēng)電并網(wǎng)和傳輸系統(tǒng)中倍受青睞。隨著各國(guó)對(duì)風(fēng)電并網(wǎng)要求的逐漸提高，VSC-HVDC系統(tǒng)的低電壓穿越(Low Voltage Ride Through,LVRT)問題成為了國(guó)內(nèi)外研究的熱點(diǎn)。 本文主要圍繞海上風(fēng)電VSC-HVDC系統(tǒng)的低電壓穿越控制技術(shù)展開分析，重點(diǎn)研究了當(dāng)電網(wǎng)發(fā)生深度電壓跌落時(shí)的VSC-HVDC直流側(cè)過電壓和交流并網(wǎng)點(diǎn)電壓凹陷問題，提出采用動(dòng)態(tài)電壓恢復(fù)器(Dynamic Voltage Restorer, DVR)輔助VSC-HVDC實(shí)現(xiàn)低電壓穿越的控制方法。具體實(shí)施方案由以下兩方面組成：一方面，在淺度電壓跌落情況下，提出采用VSC-HVDC傳統(tǒng)無功補(bǔ)償策略，DVR處于旁路狀態(tài)，風(fēng)電場(chǎng)能夠穩(wěn)定運(yùn)行。另一方面，當(dāng)電網(wǎng)電壓深度跌落時(shí)，單純的無功補(bǔ)償策略已不能穩(wěn)定直流母線和交流并網(wǎng)點(diǎn)電壓。此時(shí)，切換VSC-HVDC改進(jìn)的控制策略并投入帶能耗電阻的超級(jí)電容型DVR，通過DC/DC變換器控制能耗電阻和超級(jí)電容陣列吸收VSC-HVDC直流母線側(cè)過剩能量，，以維持直流母線電壓穩(wěn)定；同時(shí)利用超級(jí)電容放電給DVR逆變器提供穩(wěn)定的直流電源，以快速補(bǔ)償電網(wǎng)故障電壓，使岸上交流母線電壓維持正常水平。此外，在故障期間由于協(xié)調(diào)控制策略具有很好的魯棒性能，保證了風(fēng)電機(jī)組的穩(wěn)定運(yùn)行。 在MATLAB/Simulink中搭建整個(gè)海上風(fēng)電場(chǎng)VSC-HVDC和DVR的仿真模型，并進(jìn)行了三相電壓深度跌落故障、三相短路故障及單相短路故障的仿真驗(yàn)證，結(jié)果表明該協(xié)調(diào)控制策略不僅提高了系統(tǒng)效率，而且在對(duì)稱與不對(duì)稱電壓故障情況下都能體現(xiàn)出良好的補(bǔ)償性能，對(duì)海上風(fēng)電系統(tǒng)的可靠運(yùn)行和低電壓穿越能力的提高具有一定的現(xiàn)實(shí)意義。
[Abstract]:The booming development of offshore wind power industry provides an important guarantee to solve the energy crisis, in which the flexible direct current transmission technology (Voltage Source Converter-Based HVDC, VSC-HVDC) based on voltage source converter is highly efficient. Flexibility and controllability are very popular in offshore wind power grid and transmission system. With the increasing demand of wind power grid connection, the problem of low voltage traversing (Low Voltage Ride Through,LVRT (Low Voltage Ride Through,LVRT) in VSC-HVDC system has become a hot research topic at home and abroad. In this paper, the low-voltage traversing control technology of offshore wind power VSC-HVDC system is analyzed, and the overvoltage of VSC-HVDC DC side and the voltage sag of AC node when the power grid is in depth voltage sag are studied in this paper. A control method of low voltage traversing using dynamic voltage restorer (Dynamic Voltage Restorer, DVR) assisted VSC-HVDC is proposed. The concrete implementation scheme consists of the following two aspects: on the one hand, under the condition of shallow voltage drop, the traditional reactive power compensation strategy of VSC-HVDC is proposed, the DVR is in the bypass state, and the wind farm can operate stably. On the other hand, when the voltage depth drops, the simple reactive power compensation strategy can not stabilize the DC bus and AC node voltage. At this time, switching the improved control strategy of VSC-HVDC and putting the super capacitor DVR, with energy consumption resistance to control the energy consumption resistance and super capacitor array to absorb the excess energy of VSC-HVDC DC bus side through the DC/DC converter. To maintain DC bus voltage stability; At the same time, the supercapacitor discharge is used to provide the DVR inverter with a stable DC power supply, which can quickly compensate the fault voltage of the power grid and make the on-shore AC bus voltage maintain the normal level. In addition, due to the good robustness of the coordinated control strategy during the fault period, the stable operation of the wind turbine is ensured. The simulation models of VSC-HVDC and DVR for offshore wind farm are built in MATLAB/Simulink, and the simulation verification of three-phase voltage depth sag fault, three-phase short-circuit fault and single-phase short-circuit fault is carried out. The results show that the coordinated control strategy not only improves the efficiency of the system, but also shows good compensation performance in the case of symmetric and asymmetric voltage faults. It has certain practical significance for the reliable operation of offshore wind power system and the improvement of low voltage traversing ability.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM614

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 魏曉光;湯廣福;魏曉云;遲永寧;;VSC-HVDC控制器抑制風(fēng)電場(chǎng)電壓波動(dòng)的研究[J];電工技術(shù)學(xué)報(bào);2007年04期

2 周雪松;張智勇;馬幼捷;向龍瑞;;動(dòng)態(tài)電壓恢復(fù)器檢測(cè)方法與補(bǔ)償策略的研究[J];電力電子技術(shù);2006年03期

3 劉鐘淇;宋強(qiáng);劉文華;;采用MMC變流器的VSC-HVDC系統(tǒng)故障態(tài)研究[J];電力電子技術(shù);2010年09期

4 楊耕;鄭重;;雙饋型風(fēng)力發(fā)電系統(tǒng)低電壓穿越技術(shù)綜述[J];電力電子技術(shù);2011年08期

5 唐志,楊潮,馬維新;串聯(lián)型電能質(zhì)量補(bǔ)償器主電路設(shè)計(jì)方案[J];電力系統(tǒng)自動(dòng)化;2002年19期

6 李霄;胡長(zhǎng)生;劉昌金;徐德鴻;;基于超級(jí)電容儲(chǔ)能的風(fēng)電場(chǎng)功率調(diào)節(jié)系統(tǒng)建模與控制[J];電力系統(tǒng)自動(dòng)化;2009年09期

7 管敏淵;徐政;屠卿瑞;潘偉勇;;模塊化多電平換流器型直流輸電的調(diào)制策略[J];電力系統(tǒng)自動(dòng)化;2010年02期

8 洪蘆誠(chéng);魏應(yīng)冬;姜齊榮;王志永;;基于動(dòng)態(tài)電壓調(diào)節(jié)器的風(fēng)電機(jī)組低電壓穿越策略[J];電力系統(tǒng)自動(dòng)化;2011年16期

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

10 徐科;吳超;楊曉靜;胡敏強(qiáng);;VSC-HVDC系統(tǒng)風(fēng)力發(fā)電結(jié)構(gòu)分析與控制[J];電網(wǎng)技術(shù);2009年04期

本文編號(hào)：2409730