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    Suzhou Electric Appliance Research Institute
    期刊號: CN32-1800/TM| ISSN1007-3175

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    MMC-HVDC在青藏直流逆變側換相失敗問題中的仿真研究

    來源:電工電氣發(fā)布時間:2022-03-24 15:24 瀏覽次數(shù):456

    MMC-HVDC在青藏直流逆變側換相失敗問題中的仿真研究

    呂曉舉1,李朝霞1,臧堃1,崔寧寧2,陳福偉1,耿龍海1,權學政1
    (1 西藏農牧學院 水利土木工程學院,西藏 林芝 860000;
    2 靜寧縣水務局,甘肅 靜寧 743400)
     
         摘 要:針對青藏直流存在換相失敗的問題,提出了柔性直流輸電的技術方案。分析了電壓源換流器的數(shù)學模型,介紹了 MMC 的拓撲結構,并詳細計算了青藏柔性直流的系統(tǒng)參數(shù)。利用 ADPSS 軟件搭建了 11 電平的青藏柔性直流模型,并在逆變側分別設置了單相接地短路故障、兩相接地短路故障、三相接地短路故障,分別對各種不同類型的故障進行了仿真研究。仿真結果表明,在三種嚴重程度不同的故障情況下,電壓下降的幅度逐漸增加,直流輸電傳送的功率也逐漸下降,但都未發(fā)生換相失敗,青藏柔性直流輸電依舊完成了換相,驗證了該方案的可行性,為防御青藏直流換相失敗提供了思路。
        關鍵詞:青藏直流;換相失?。籑MC-HVDC ;不對稱短路故障;PSASP 軟件
        中圖分類號:TM721.1     文獻標識碼:A     文章編號:1007-3175(2022)03-0019-08
     
    Simulation Study of MMC-HVDC in the Problem of Commutation
    Failure on the Qinghai-Tibet DC Inverter Side
     
    LYU Xiao-ju1, LI Zhao-xia1, ZANG Kun1, CUI Ning-ning2, CHEN Fu-wei1, GENG Long-hai1, QUAN Xue-zheng1
    (1 College of Hydraulic and Civil Engineering, Tibet Agriculture and Animal Husbandry University, Nyingchi 860000, China;
    2 Jingning Water Bureau, Jingning 743400, China)
     
        Abstract: This paper proposed a technical solution for flexible HVDC transmission based on the problem of commutation failure in Qinghai-Tibet HVDC. It analyzed the mathematical model of the voltage source converter, introduced the topology of MMC, and calculated the system parameters of Qinghai-Tibet voltage direct current in detail. This research constructed an 11-level Qinghai-Tibet flexible DC model by using PSASP software. It set a single-phase grounding short circuit fault, one two-phase grounding short circuit fault, and a three-phase grounding short circuit fault on the inverting side, and did the simulation study respectively.The simulation results show that the voltage drop increases gradually, and the power transmitted by the HVDC decreases gradually under different conditions. However, the phenomenon of commutation failure does not occur, and the Qinghai-Tibet still completes the commutation. The simulation experiment verifies the feasibility of the scheme and this study provides an idea to prevent the commutation failure of Qinghai-Tibet HVDC.
        Key words: Qinghai-Tibet DC; commutation failure; MMC-HVDC; asymmetric short circuit fault; PSASP software
     
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