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期刊號: CN32-1800/TM| ISSN1007-3175

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海上風電送出交流故障穿越控制策略研究

來源:電工電氣發布時間:2021-04-30 15:30 瀏覽次數:10

海上風電送出交流故障穿越控制策略研究

蘇勻1,2,馬小婷2,李少華2

(1 西安西電電力系統有限公司,陜西 西安 710065;
2 西安端怡科技有限公司,陜西 西安 710075)
 
    摘 要:對于大規模海上風電場經 MMC 型柔性直流輸電并網系統,在陸上側交流故障穿越過程中,由于卸荷電路是在直流電壓達到一定基準電壓時才開始工作,導致陸上側換流器子模塊電壓存在過大的沖擊,有損壞功率元器件的風險。為解決該暫態過程中子模塊電容電壓過高的問題,分析了模塊化卸荷電路的拓撲結構與控制方法,并根據交流故障期間的系統特性對控制策略進行改進,通過控制模式的切換并配合改變參考波定值,充分利用 MMC 自身特性,在保證系統故障穿越性能的前提下對子模塊電壓進行抑制。根據荷蘭海上風電柔直外送項目的參數,在 PSCAD/EMTDC 中搭建了兩端雙極柔性直流輸電系統模型,驗證了所提改進控制策略可有效抑制子模塊的過電壓水平。
    關鍵詞:MMC-HVDC ;故障穿越;模塊化卸荷電路;子模塊電壓抑制;海上風電場
    中圖分類號:TM614 ;TM721.1     文獻標識碼:A     文章編號:1007-3175(2021)04-0011-06
 
Research on Control Strategy of AC Fault Ride-Through for
Offshore Wind Power Transmission
 
SU Yun1,2, MA Xiao-ting2, LI Shao-hua2
(1 Xi’an XD Power Systems Co., Ltd, Xi’an 710065, China;
2 Xi’an Gentle Mellow Technology Co., Ltd, Xi’an 710075, China)
 
    Abstract: For the large-scale offshore wind farm connected with multilevel modular converter based high voltage direct current (MMCHVDC)system, during the fault ride-through process of the offshore AC system, the braking chopper starts to work when the DC voltage reaches a certain reference voltage, which leads to over-voltage of the onshore converter sub-module, which may damage power components.In order to solve the problem that the capacitor voltage of the sub-module is too high in the transient process, the topology structure and control method of the modular braking chopper are analyzed, and the control strategy is improved according to the system characteristics during the AC fault. By switching the control mode and changing the voltage reference value, the inherent characteristics of MMC are fully utilized to ensure the fault ride-through performance of the system. The sub-module over-voltage is suppressed. Finally, according to the parameters of the offshore wind farm integration project in Holland, a two terminal bipolar flexible DC transmission system is built in PSCAD/EMTDC to verify the effectiveness of the improved control strategy.
    Key words: multilevel modular converter based high voltage direct current (MMC-HVDC); fault ride-through; modular braking chopper;sub-module voltage suppression; offshore wind farm
 
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