本文選題：混合直流輸電系統(tǒng) + 并聯(lián)支路站　； 參考：《電網(wǎng)技術》2016年09期

【摘要】：電網(wǎng)換相型高壓直流輸電系統(tǒng)(line commutated converter based high voltage direct current,LCC-HVDC)型直流輸電系統(tǒng)難以引出功率分支,且多端系統(tǒng)間的電流協(xié)調(diào)困難。為解決這一問題,方便線路走廊附近的區(qū)域供電和可再生能源的接入,提出從LCC型雙端直流輸電系統(tǒng)中導出一個全橋子模塊模塊化多電平換流器(full bridge based modular multilevel converter,FB-MMC)功率分支站的混合型多端直流輸電系統(tǒng)方案。重點研究了含F(xiàn)B-MMC功率分支站的多端直流系統(tǒng)控制及協(xié)調(diào)策略,在直流低電壓和過調(diào)制運行工況下,研究設計了FB-MMC功率分支站的控制策略,并對直流故障穿越策略進行了優(yōu)化,同時設計了混合直流系統(tǒng)的功率反轉(zhuǎn)策略。最后采用PSCAD/EMTDC對直流故障穿越、功率反轉(zhuǎn)和功率分支站的交流系統(tǒng)故障進行了仿真研究。結(jié)果表明,與LCC分支方案相比,FB-MMC方案能夠簡化多端系統(tǒng)間的協(xié)調(diào)控制,優(yōu)化系統(tǒng)整體性能,并能更好地抵抗交流系統(tǒng)故障。
[Abstract]:The power branch of (line commutated converter based high voltage direct current- LCC-HVDC DC transmission system is difficult to elicit, and the current coordination among multi-terminal systems is difficult. To address this problem by facilitating access to electricity and renewable energy in areas near the corridor, This paper presents a hybrid multiterminal DC transmission system scheme for a full-bridge modularized multilevel converter (full bridge based modular multilevel convertor FB-MMC power branch station derived from the LCC-type dual-terminal HVDC transmission system. The control and coordination strategy of multi-terminal DC system with FB-MMC power branch station is studied. The control strategy of FB-MMC power branch station is designed under the condition of low DC voltage and over-modulation, and the strategy of DC fault passing through is optimized. At the same time, the power reversal strategy of hybrid DC system is designed. Finally, PSCAD / EMTDC is used to simulate DC fault traversing, power inversion and AC system fault of power branch station. The results show that the FB-MMC scheme can simplify the coordinated control between multi-terminal systems, optimize the overall performance of the system, and better resist the fault of AC system compared with the LCC branching scheme.
【作者單位】： 西安交通大學電氣工程學院;許繼電氣股份有限公司;廈門大學嘉庚學院;
【分類號】：TM721.1
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本文編號：2103717