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

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交流不對稱故障下MMC-HVDC系統(tǒng)的故障穿越控制研究

來源:電工電氣發(fā)布時間:2022-01-20 14:20 瀏覽次數(shù):620

交流不對稱故障下MMC-HVDC系統(tǒng)的故障穿越控制研究

張利1,牛沖宣1,周春雨1,劉慶邦2
(1 中國電力工程顧問集團(tuán)西北電力設(shè)計(jì)院有限公司,陜西 西安 710075;
2 西安交通大學(xué) 電氣工程學(xué)院,陜西 西安 710049)
 
    摘 要:MMC-HVDC 系統(tǒng)中交流電網(wǎng)發(fā)生不對稱故障會導(dǎo)致三相電壓不平衡,進(jìn)而產(chǎn)生正負(fù)序分量影響系統(tǒng)的控制性能,嚴(yán)重時甚至引起換流站閉鎖。介紹了 MMC-HVDC 系統(tǒng)的拓?fù)浣Y(jié)構(gòu)、工作原理以及數(shù)學(xué)模型。在分析交流不對稱故障下系統(tǒng)運(yùn)行特性的基礎(chǔ)上,設(shè)計(jì)了適用于交流不對稱工況的 MMC 負(fù)序電流抑制器,用以抑制交流不對稱故障下?lián)Q流站的負(fù)序電流,并對此時系統(tǒng)直流側(cè)電壓存在二倍頻波動的問題進(jìn)行分析,提出了兩相旋轉(zhuǎn)坐標(biāo)系下的 PI 解耦控制來實(shí)現(xiàn)對直流側(cè)電壓二倍頻分量的抑制,使系統(tǒng)在交流不對稱故障下具備故障穿越能力。在 PSCAD/EMTDC 建立仿真模型,驗(yàn)證了所提出的故障穿越控制策略的有效性。
    關(guān)鍵詞:柔性直流輸電;模塊化多電平換流器;交流不對稱故障;負(fù)序電流抑制;電壓二倍頻波動抑制;故障穿越控制
    中圖分類號:TM72     文獻(xiàn)標(biāo)識碼:A     文章編號:1007-3175(2022)01-0001-07
 
Research on Fault Ride-Through Control Method of MMC-HVDC
System Under AC Asymmetrical Faults
 
ZHANG Li1, NIU Chong-xuan1, ZHOU Chun-yu1, LIU Qing-bang2
(1 Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi'an 710075, China;
2 School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
 
    Abstract: Asymmetrical faults in the AC grid in the MMC-HVDC system will lead to unbalanced three-phase voltages, and then produce positive and negative sequence components that affect the control performance of the system, and even cause the converter station to lock up in severe cases.This article introduces the topological structure, working principle and mathematical model of the MMC-HVDC system.Based on the analysis of the operating characteristics of the system under AC asymmetric faults, design MMC negative sequence current,suppression, controller, which is suitable for AC asymmetric conditions to suppress the negative sequence current of the converter station under the AC asymmetric faults.The problem of double frequency fluctuations in the DC side voltage of the system is analyzed, and the PI decoupling control under the two-phase rotating coordinate system is proposed to suppress the double frequency component of the DC side voltage, so that the MMC-HVDC system has the fault ride-through capability under AC asymmetry faults. Finally, a simulation model is established in PSCAD/EMTDC, which verifies the effectiveness of the proposed fault ride-through control strategy.
    Key words: flexible DC transmission; modular multilevel converter; AC asymmetric fault; negative sequence current suppression; voltage double frequency fluctuation suppression; fault ride-through control
 
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