摘要
在借鉴传统高压直流三极输电和模块化多电平换流器型直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)的基础上,提出基于MMC的高压直流三极输电技术。该技术采用五电平子模块来满足极3直流电压极性和直流电流方向周期性变化的要求。首先分析了五电平子模块的工作模式和闭锁后故障等值电路,而后分析了基于MMC的高压直流三极输电的电流调制策略,设计了MMC相应的控制策略。最后基于PSCAD/EMTDC搭建了基于MMC的高压直流三极输电系统,仿真算例结果验证了该系统的可行性。
On the basis of referring to traditional tri-pole high-voltage DC power transmission and modular multilevel converter based high voltage direct current （MMC-HVDC）, an MMC based tri-pole high-voltage DC power transmission technology, is proposed. In the MMC based tri-pole high-voltage DC power transmission technology the five-level sub-module is used to meet the requirement of periodical variation of DC voltage polarity and DC current direction in the pole 3. Firstly, the working modes of five-level sub-module and its equivalent circuit after the blocking fault are analyzed;then the current modulation strategy of the MMC based tri-pole high-voltage DC power transmission technology is analyzed, and corresponding control strategy for MMC is designed. Based on PSCAD/EMTDC, a model of the MMC based tri-pole high-voltage DC power transmission system is constructed, and the feasibility of the MMC based tri-pole high-voltage DC power transmission system is validated by simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2014年第4期838-843,共6页
Power System Technology
基金
国家863高技术基金项目(2013AA050105)~~
