一种基于反并联晶闸管全桥子模块的新型电容换相换流器
发布时间：2019-07-01 12:13
【摘要】：为了改善电容换相换流器(capacitor commutated converter,CCC)的故障特性,提出了一种基于反并联晶闸管全桥子模块的新型电容换相换流器拓扑(enhanced capacitor commutated converter,ECCC)。ECCC从提高电容电压可控性的角度出发,将换流阀和换流变压器之间的固定电容替换为反并联晶闸管全桥子模块。设计了子模块晶闸管与阀臂晶闸管的协调控制策略;分析了子模块晶闸管的电压电流应力。在PSCAD/EMTDC环境中对ECCC的子模块电压电流应力、抵御换相失败的能力和换相失败后恢复能力进行了仿真研究。结果表明:ECCC可以有效降低换相失败发生的概率;同时,由于其对电容电压的灵活控制能力,可以有效避免换相失败发生后类似CCC换流器失去自恢复能力的问题,具备故障快速恢复能力;并且,子模块的电压电流应力均在合理范围内。
[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.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(51507060) 高等学校博士学科点专项科研基金资助项目(20130036120006)~~
【分类号】：TM721.1;TM46
本文编号：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.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(51507060) 高等学校博士学科点专项科研基金资助项目(20130036120006)~~
【分类号】：TM721.1;TM46
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