發(fā)布時(shí)間：2018-02-02 23:36

  本文關(guān)鍵詞： 交直流混聯(lián) 安穩(wěn)裝置 換相失敗 短路故障 相序電壓 RTDS實(shí)驗(yàn)　出處：《南京理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)交流輸電系統(tǒng)中電網(wǎng)安全穩(wěn)定故障跳閘判據(jù)日臻完善,但是隨著高壓直流的饋入,當(dāng)電網(wǎng)發(fā)生短路故障時(shí),直流近區(qū)交流線路電氣特性變化與傳統(tǒng)交流線路相比有較大的區(qū)別,傳統(tǒng)安穩(wěn)裝置中的故障跳閘判據(jù)應(yīng)用到直流近區(qū)交流線路時(shí)存在誤動(dòng)或者拒動(dòng)的可能,因此研究適應(yīng)直流換流站近區(qū)交流線路上的安穩(wěn)裝置故障跳閘新判據(jù)具有重要的意義。論文依托國家電網(wǎng)公司科技項(xiàng)目“適應(yīng)智能化發(fā)展需求的電網(wǎng)安全和充�？刂萍夹g(shù)研究與應(yīng)用——課題二：包含電網(wǎng)安全穩(wěn)定控制新判據(jù)研究、實(shí)驗(yàn)樣機(jī)開發(fā)和示范。首先在PSCAD/EMTDC中建立了含三條直流饋入的交直流混聯(lián)系統(tǒng),詳細(xì)介紹了主要直流輸電元件和直流控制系統(tǒng)的建模過程。以直流近區(qū)交流線路發(fā)生單相短路故障為例,分析了短路故障引起換流站發(fā)生換相失敗時(shí)各晶閘管的導(dǎo)通和關(guān)斷狀態(tài),給出了該異常運(yùn)行狀態(tài)的導(dǎo)通回路,據(jù)此提出了短路電流幅值與短路起始時(shí)刻之間的關(guān)系。在所搭建的模型中,驗(yàn)證了直流近區(qū)交流線路發(fā)生各種類型短路故障時(shí)保護(hù)安裝處的電氣量變化規(guī)律,證實(shí)了理論分析的可靠性。進(jìn)而認(rèn)為直流近區(qū)短路電流幅值過小或持續(xù)時(shí)間過短是傳統(tǒng)故障跳閘判據(jù)拒動(dòng)或誤動(dòng)的主要原因。根據(jù)直流近區(qū)交流線路短路故障中相序電壓的特性,提出了基于序電壓特征分量為主判據(jù)的適應(yīng)電網(wǎng)安全穩(wěn)定控制裝置的故障跳閘新判據(jù)。在SCS-500E分布式安穩(wěn)裝置中配置了該判據(jù),RTDS實(shí)驗(yàn)證明了新判據(jù)在各種故障類型下都可以準(zhǔn)確動(dòng)作。
[Abstract]:In the traditional AC transmission system, the criterion of safe and stable fault tripping is becoming more and more perfect, but with the feed of HVDC, when the power network short-circuit fault occurs. The variation of electrical characteristics of DC near AC lines is different from that of traditional AC lines. There is a possibility of maloperation or rejection in the fault tripping criterion of traditional stabilizer when it is applied to DC near AC lines. Therefore, it is of great significance to study the new criterion of fault tripping for the safety device on the AC line near the DC converter station. This paper relies on the S & T project of the State Grid Company. " Research and Application of Power Grid Safety and adequacy Control Technology to meet the demand of Intelligent Development- 鈪，

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