基于LCC和F-MMC的混合三极子直流控制

F. Xu, Zheng Xu
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引用次数: 4

摘要

为了克服传统三极高压直流系统固有的一些缺陷,提出了一种混合三极高压直流系统结构,用基于级联全桥子模块(FBSM)的模块化多电平变换器(F-MMC)代替三极晶闸管变换器。为了提高传输容量,采用了一种特殊的电流调制方式。为了满足过渡过程中无功(电压)平衡、直流电流平衡和子模块电容器电压平衡的要求,提出了相应的控制策略。通过PSCAD/EMTDC的时域仿真研究,评估了所提出的混合三极子HVDC结构的性能。结果表明,所提出的控制策略能使系统获得满意的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Control of hybrid tripole HVDC based on LCC and F-MMC
In order to overcome some inherent defects of the conventional tripole HVDC, a hybrid tripole HVDC structure is proposed, which replaces the thyristor converters of pole 3 with the modular multilevel converters (F-MMC) based on cascaded full bridge sub-modules (FBSM). To increase the transmission capacity, a special current modulation is adopted. In order to meet the demands of the reactive power (voltage) balance, the DC current balance and the sub-module capacitor voltage balance in the transition process, the corresponding control strategies are also proposed. The performance of the proposed hybrid tripole HVDC structure is evaluated through time-domain simulation studies in PSCAD/EMTDC. The results show that a satisfactory response of the system can be achieved with the proposed control strategies.
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