【摘要】：為應對柔性直流輸電在遠距離大容量架空線輸電領域應用問題,基于鉗位雙子模塊和雙晶閘管子模塊拓撲構成的兩種模塊化多電平換流器,設計了串聯(lián)雙極混合直流輸電系統(tǒng),既提高了輸電容量,又能緩解單種拓撲能耗較大或直流故障抑制時間較長問題。重點分析了雙極混合拓撲在不同直流故障下等值電路和直流故障穿越機理及其抑制特性。最后,在PSCAD/EMTDC仿真環(huán)境下搭建雙極混合直流輸電模型,對系統(tǒng)穩(wěn)態(tài)運行工況和直流故障穿越特性進行了對比研究。仿真結果表明,雙極混合系統(tǒng)既體現(xiàn)出靈活多樣的穩(wěn)態(tài)運行特性,又具有直流故障穿越與快速恢復能力,較好地適用于遠距離大容量架空線路輸電應用領域。
[Abstract]:In order to deal with the application of flexible direct current transmission in the field of long-distance large capacity overhead transmission, a series bipolar hybrid DC transmission system is designed based on two modularized multilevel converters, which are composed of two modular multilevel converters based on the topology of clamped double submodules and double thyristor submodules. It can not only increase the transmission capacity, but also alleviate the problem of large energy consumption of single topology and long DC fault suppression time. The equivalent circuit of bipolar hybrid topology under different DC faults, the mechanism of DC fault traversing and its suppression characteristics are analyzed. Finally, a bipolar hybrid DC transmission model is built under the PSCAD/EMTDC simulation environment, and the steady-state operating conditions and DC fault traversing characteristics of the system are compared and studied. The simulation results show that the bipolar hybrid system not only embodies flexible and diverse steady-state operation characteristics, but also has the ability of DC fault traversing and fast recovery, which is suitable for long-distance and large-capacity overhead transmission applications.
【作者單位】： 新能源電力系統(tǒng)國家重點實驗室(華北電力大學);國網(wǎng)唐山供電公司;
【基金】：國家高技術研究發(fā)展計劃(863計劃)資助項目(2015AA050603) 河北省自然科學基金資助項目(E2015502046)~~
【分類號】：TM721.1
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本文編號：2281400