一种适用于交流线路改造成直流的扩展式双极直流输电结构

发布时间：2018-04-21 13:30

本文选题：扩展式双极直流输电 + 电流调节控制器　；参考：《中国电机工程学报》2014年33期

【摘要】：为提升现有交流输电线路的输送能力,提出了一种将交流线路改造成直流的拓扑结构,即扩展式双极直流输电结构。详细介绍了扩展式双极直流的运行原理以及相关辅助设备在过渡阶段的动作时序。同时,对电流调节控制器的运行范围进行了研究,并指出由全桥子模块级联构成的全桥模块化多电平换流器能够用作电流调节控制器。为使得系统能够稳定运行,给出了12脉动晶闸管换流器和全桥模块化多电平换流器的控制策略,尤其对直流电流调节和电容电压平衡控制进行了分析和设计。通过PSCAD/EMTDC时域仿真,验证了所提出的扩展式双极直流输电系统及其控制策略的可行性和有效性,表明了系统能够在过渡阶段跟随指令变化,同时还具有较好的暂态响应能力。
[Abstract]:In order to improve the transmission capacity of the existing AC transmission lines, a new topology is proposed to transform the AC lines into DC, that is, the extended bipolar HVDC transmission structure. The operation principle of extended bipolar DC and the timing of the related auxiliary devices in the transition stage are introduced in detail. At the same time, the operating range of the current regulation controller is studied, and it is pointed out that the full bridge modularized multilevel converter composed of the whole bridge sub-module cascade can be used as the current regulation controller. In order to make the system run stably, the control strategies of 12 pulsating thyristor converters and full bridge modularized multilevel converters are presented, especially the DC current regulation and capacitive voltage balance control are analyzed and designed. The feasibility and effectiveness of the proposed extended bipolar DC transmission system and its control strategy are verified by PSCAD/EMTDC simulation in time domain. It is shown that the system can follow the change of instruction in the transition phase and has good transient response ability.
【作者单位】：浙江大学电气工程学院;
【基金】：国家863高技术基金项目(2012AA050205)~~
【分类号】：TM721.2

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