本文選題：柔性直流輸電 + 多端直流�。� 參考：《電力系統(tǒng)自動(dòng)化》2017年19期

【摘要】：隨著國(guó)內(nèi)柔性直流輸電技術(shù)的快速發(fā)展,基于真雙極接線的多端柔性輸電技術(shù)將被越來(lái)越多地應(yīng)用到實(shí)際工程中。不同于單極線路或換流器退出運(yùn)行時(shí),偽雙極系統(tǒng)下會(huì)出現(xiàn)的線路過(guò)載和切機(jī)切負(fù)荷現(xiàn)象,對(duì)于運(yùn)行方式更為靈活的真雙極系統(tǒng),由于非故障極可轉(zhuǎn)代故障極的部分功率,使得電網(wǎng)可靠性和整體輸電能力的提升成為可能。提出了一種適用于真雙極多端柔性直流輸電(VSC-MTDC)系統(tǒng)的功率轉(zhuǎn)代策略:基于真雙極系統(tǒng)正負(fù)極電網(wǎng)可獨(dú)立控制功率的特點(diǎn),當(dāng)直流系統(tǒng)在非正常運(yùn)行狀況下出現(xiàn)非對(duì)稱(chēng)拓?fù)鋾r(shí),在確保各元件不越限的前提下使非故障極電網(wǎng)轉(zhuǎn)代故障極電網(wǎng)部分功率,以提高VSC-MTDC系統(tǒng)的總傳輸容量。同時(shí),基于張北±500 k V柔性直流輸電示范工程,搭建了真雙極四端柔性直流輸電PSCAD/EMTDC仿真系統(tǒng),對(duì)所提策略進(jìn)行了有效性驗(yàn)證。
[Abstract]:With the rapid development of domestic flexible direct current transmission technology, multi-terminal flexible transmission technology based on true bipolar connection will be applied more and more to practical projects. Unlike when the unipolar line or converter exits from operation, the phenomenon of line overload and cutting off load in pseudo-bipolar system will occur. For the true bipolar system with more flexible operation mode, due to the partial power of the non-fault pole can be transferred to the fault pole, It is possible to improve the reliability of power grid and the overall transmission capacity. A power generation strategy for true bipolar multiterminal flexible direct current transmission (VSC-MTDC) system is proposed. Based on the characteristic that the positive and negative pole power of true bipolar system can be independently controlled, when the DC system has asymmetric topology under abnormal operation, In order to improve the total transmission capacity of the VSC-MTDC system, the non-fault pole network is replaced by the partial power of the fault pole network without overrunning the limits of the components. At the same time, based on Zhangbei 鹵500kV flexible DC transmission demonstration project, a true bipolar four-terminal flexible DC transmission PSCAD / EMTDC simulation system is built, and the effectiveness of the proposed strategy is verified.
【作者單位】： 東南大學(xué)電氣工程學(xué)院;中國(guó)電力科學(xué)研究院;
【基金】：國(guó)家電網(wǎng)公司科技項(xiàng)目(XT71-16-012)~~
【分類(lèi)號(hào)】：TM721.1
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本文編號(hào)：2068762