本文選題：特高壓直流 + 柔性直流��； 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：特高壓直流輸電具有大容量、遠(yuǎn)距離和低損耗等優(yōu)點(diǎn),±1100kV特高壓直流輸電作為一個(gè)全新的輸電電壓等級(jí),非常適合特大型能源基地向遠(yuǎn)方負(fù)荷中心輸送電能。多端柔性直流輸電與傳統(tǒng)直流輸電相比具有諸多優(yōu)勢(shì),非常適用于可再生能源并網(wǎng)、分布式發(fā)電并網(wǎng)、孤島供電、城市電網(wǎng)供電和異步交流電網(wǎng)互聯(lián)等領(lǐng)域。特高壓直流輸電和柔性直流輸電是當(dāng)今直流輸電領(lǐng)域的兩大熱點(diǎn),代表著直流輸電技術(shù)的最高水平。 直流換流站的絕緣配合研究是直流輸電工程實(shí)施中的關(guān)鍵技術(shù)之一,緣水平的高低直接關(guān)系到整個(gè)直流工程造價(jià)。本文分別對(duì)±1100kV特高壓直流和基于模塊化多電平換流器(Modular Multilevel Converter, MMC)型的多端柔性直流輸電系統(tǒng)的換流站絕緣配合進(jìn)行了研究。 根據(jù)±800kV特高壓直流換流站的絕緣配合經(jīng)驗(yàn),并考慮±1100kV特高壓換流站絕緣配合的特殊性,提出了±1100kV特高壓換流站的避雷器布置方案,通過(guò)計(jì)算確定了換流站交直流側(cè)的避雷器參數(shù),在此基礎(chǔ)上通過(guò)仿真計(jì)算得到了換流站設(shè)備的過(guò)電壓水平,并確定了±1100kV特高壓換流站設(shè)備的絕緣裕度,最后采用慣用法確定了換流站關(guān)鍵設(shè)備的絕緣水平。 對(duì)于多端柔性直流輸電系統(tǒng),目前世界上暫無(wú)此類(lèi)工程的絕緣配合經(jīng)驗(yàn)。本文以舟山多端柔性直流輸電工程為例,結(jié)合高壓直流換流站的避雷器布置原則,確定了多端柔性直流換流站的避雷器布置,然后詳細(xì)介紹了柔性直流換流站避雷器參數(shù)的選取原則、交直流側(cè)避雷器的計(jì)算方法,并仿真計(jì)算了舟山多端柔性直流工程各端換流站關(guān)鍵設(shè)備的過(guò)電壓水平,并確定了換流站關(guān)鍵設(shè)備的絕緣裕度,最后計(jì)算確定了多端柔性直流換流站交直流設(shè)備的絕緣水平。 最后,本文針對(duì)±1100kV特高壓直流和多端柔性直流輸電系統(tǒng)的特點(diǎn),得到了換流站在分別采取其他避雷器布置方案下的設(shè)備絕緣水平,并比較了各種不同避雷器布置方案下絕緣配合的區(qū)別及優(yōu)缺點(diǎn),可為實(shí)際工程選取避雷器布置方案提供參考。
[Abstract]:UHV HVDC transmission has the advantages of large capacity, long distance and low loss. As a new voltage grade, 鹵1100kV UHV HVDC transmission is very suitable for the ultra-large energy base to transmit electric energy to the remote load center. Compared with traditional DC transmission, multi-terminal flexible DC transmission has many advantages. It is very suitable for renewable energy grid, distributed generation, isolated island power supply, urban power supply and asynchronous AC network interconnection and so on. UHV DC transmission and flexible DC transmission are two hot spots in the field of HVDC transmission, representing the highest level of HVDC technology. The research on insulation coordination of HVDC converter station is one of the key technologies in the implementation of HVDC project. The level of edge is directly related to the cost of the whole DC project. In this paper, the insulation coordination of 鹵1100kV UHV DC and MMC-based multiterminal flexible DC transmission system based on modularized multilevel converter is studied. Based on the experience of 鹵800kV UHV DC converter station insulation coordination, Considering the particularity of insulation coordination of 鹵1100kV UHV converter station, the lightning arrester layout scheme of 鹵1100kV UHV converter station is put forward, and the lightning arrester parameters of AC / DC side of converter station are determined by calculation. On this basis, the over-voltage level of converter station equipment is obtained by simulation, and the insulation margin of 鹵1100kV UHV converter station equipment is determined. Finally, the insulation level of the key equipment in converter station is determined by using the customary method. There is no insulation cooperation experience for the multi-terminal flexible direct current transmission system in the world at present. Taking the multi-terminal flexible DC transmission project in Zhoushan as an example, combined with the principle of lightning arrester arrangement of HVDC converter station, the lightning arrester arrangement of multi-terminal flexible DC converter station is determined. Then the selection principle of the lightning arrester parameters of the flexible DC converter station and the calculation method of the AC / DC side lightning arrester are introduced in detail, and the overvoltage level of the key equipment of each terminal converter station in the multi-terminal flexible DC project in Zhoushan is simulated and calculated. The insulation margin of key equipment in converter station is determined, and the insulation level of AC / DC equipment in multi-terminal flexible DC converter station is calculated. Finally, the characteristics of 鹵1100kV UHV DC and multi-terminal flexible DC transmission system are discussed in this paper. The insulation level of the converter station under other arrester arrangement schemes is obtained, and the differences, advantages and disadvantages of insulation coordination under different lightning arrester layout schemes are compared, which can be used as a reference for practical engineering selection of arrester layout scheme.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM721.1

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