一種基于反并聯(lián)晶閘管全橋子模塊的新型電容換相換流器
發(fā)布時間:2019-07-01 12:13
【摘要】:為了改善電容換相換流器(capacitor commutated converter,CCC)的故障特性,提出了一種基于反并聯(lián)晶閘管全橋子模塊的新型電容換相換流器拓撲(enhanced capacitor commutated converter,ECCC)。ECCC從提高電容電壓可控性的角度出發(fā),將換流閥和換流變壓器之間的固定電容替換為反并聯(lián)晶閘管全橋子模塊。設計了子模塊晶閘管與閥臂晶閘管的協(xié)調控制策略;分析了子模塊晶閘管的電壓電流應力。在PSCAD/EMTDC環(huán)境中對ECCC的子模塊電壓電流應力、抵御換相失敗的能力和換相失敗后恢復能力進行了仿真研究。結果表明:ECCC可以有效降低換相失敗發(fā)生的概率;同時,由于其對電容電壓的靈活控制能力,可以有效避免換相失敗發(fā)生后類似CCC換流器失去自恢復能力的問題,具備故障快速恢復能力;并且,子模塊的電壓電流應力均在合理范圍內。
[Abstract]:In order to improve the fault characteristics of capacitor converter (capacitor commutated converter,CCC), a new capacitor converter topology (enhanced capacitor commutated converter,ECCC based on reverse parallel thyristor full bridge module is proposed. ECCC replaces the fixed capacitance between converter valve and converter transformer with reverse parallel thyristor full bridge module from the point of view of improving capacitance voltage controllability. The coordinated control strategy between the sub-module thyristor and the valve arm thyristor is designed, and the voltage and current stress of the sub-module thyristor is analyzed. The voltage and current stress of ECCC submodule, the ability to resist commutation failure and the recovery ability after commutation failure are simulated in PSCAD/EMTDC environment. The results show that ECCC can effectively reduce the probability of commutation failure, at the same time, because of its flexible control ability to capacitor voltage, it can effectively avoid the problem that CCC converter loses self-recovery ability after commutation failure, and has the ability of fast fault recovery, and the voltage and current stress of the sub-module is in a reasonable range.
【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);
【基金】:國家自然科學基金項目(51507060) 高等學校博士學科點專項科研基金資助項目(20130036120006)~~
【分類號】:TM721.1;TM46
本文編號:2508460
[Abstract]:In order to improve the fault characteristics of capacitor converter (capacitor commutated converter,CCC), a new capacitor converter topology (enhanced capacitor commutated converter,ECCC based on reverse parallel thyristor full bridge module is proposed. ECCC replaces the fixed capacitance between converter valve and converter transformer with reverse parallel thyristor full bridge module from the point of view of improving capacitance voltage controllability. The coordinated control strategy between the sub-module thyristor and the valve arm thyristor is designed, and the voltage and current stress of the sub-module thyristor is analyzed. The voltage and current stress of ECCC submodule, the ability to resist commutation failure and the recovery ability after commutation failure are simulated in PSCAD/EMTDC environment. The results show that ECCC can effectively reduce the probability of commutation failure, at the same time, because of its flexible control ability to capacitor voltage, it can effectively avoid the problem that CCC converter loses self-recovery ability after commutation failure, and has the ability of fast fault recovery, and the voltage and current stress of the sub-module is in a reasonable range.
【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);
【基金】:國家自然科學基金項目(51507060) 高等學校博士學科點專項科研基金資助項目(20130036120006)~~
【分類號】:TM721.1;TM46
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