基于LCC和FHMMC的混合型直流输电系统

发布时间：2018-02-13 09:22

本文关键词： 混合直流电网换相换流器混杂式模块化多电平换流器子模块数配置功率续传直流故障清除　出处：《高电压技术》2014年08期 　论文类型：期刊论文

【摘要】：现有混合直流系统中,存在送端交流系统故障时电压严重跌落导致直流系统功率中断的情况。为解决这一问题,提出了一种新型的混合直流输电系统,其整流站采用电网换相换流器(LCC),逆变站采用半桥和全桥子模块混合的混杂式模块化多电平换流器(FHMMC)。重点推导了FHMMC在满足直流故障清除、功率续传要求下其子模块个数的配置要求,给出了混合直流系统的控制特性。并从换流站级和阀级两个层次上,对FHMMC的控制策略进行了研究设计。采用PSCAD/EMTDC,从起动、送端交流故障和直流故障3方面对相应模型进行了仿真研究。结果表明,与现有混合直流系统相比,所提出的系统能够更好地维持交流故障下的功率续传,并具有直流故障自清除能力。
[Abstract]:In the existing hybrid DC system, there exists the situation that the voltage drop seriously results in the power interruption of the DC system when the terminal AC system fails. In order to solve this problem, a new hybrid DC transmission system is proposed. The rectifier station adopts the power grid commutator LCC, and the inverter station uses hybrid modularized multilevel converter with half-bridge and full-bridge sub-modules. The emphasis is given on the FHMMC to meet the DC fault clearance. The control characteristics of the hybrid DC system are given under the configuration of the number of its sub-modules under the power transmission requirement. The control strategy of FHMMC is studied and designed from the two levels of converter station level and valve level. The corresponding models are simulated from three aspects of AC fault and DC fault. The results show that compared with the existing hybrid DC system, the proposed system can maintain the power continuity under AC fault better than the existing hybrid DC system. And has the DC fault self-cleaning ability.
【作者单位】：浙江大学电气工程学院;
【基金】：国家高技术研究发展计划(863计划)(2012AA050205)~~
【分类号】：TM721.1

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