MMC-MTDC系统协调启动控制策略

发布时间：2018-10-19 19:55

【摘要】：为快速平稳的启动基于模块化多电平换流器的多端柔性直流输电系统(modular multilevel converter-multi-terminal direct current,MMC-MTDC),避免各站启动时序配合不当引起大的电气冲击甚至启动失败,提出了MMC-MTDC系统协调启动控制策略。首先,指出MMC存在交流侧、直流侧和交直流侧混合3种预充电方式,基于其充电机理,设计了预充电方式识别方法,提出了可将子模块充电至额定电压的闭环均压充电策略;其次,研究了多端系统启动时序的有效配合方案,提出了基于直流电压斜坡控制方式的并联式MMC-MTDC系统协调启动控制策略;最后,通过Matlab/Simulink构建三端系统进行仿真。结果表明:闭环均压充电方法能自动适应MMC 3种预充电方式,使子模块平稳充电至额定值;协调启动策略则能很好的实现多端系统平稳解锁。
[Abstract]:In order to start (modular multilevel converter-multi-terminal direct current,MMC-MTDC (multiterminal flexible HVDC transmission system based on modularized multilevel converter) quickly and stably, and avoid the large electrical shock or even failure caused by the improper starting sequence of each station, a coordinated startup control strategy for MMC-MTDC system is proposed. First of all, it is pointed out that there are three precharging modes in MMC: ac side, DC side and AC / DC side. Based on the charging mechanism, a method of identifying precharge mode is designed, and a closed-loop charging strategy is proposed, which can charge sub-modules to rated voltage. Secondly, the effective cooperation scheme of multi-terminal system start sequence is studied, and the coordinated start control strategy of parallel MMC-MTDC system based on DC voltage slope control is proposed. Finally, the three-terminal system is simulated by Matlab/Simulink. The results show that the closed loop equalizing charging method can automatically adapt to the three precharging modes of MMC, and make the submodule charge smoothly to the rated value, and the coordinated startup strategy can achieve the smooth unlocking of the multi-terminal system.
【作者单位】：国网浙江省电力公司电力科学研究院;许继集团有限公司;国网浙江省电力公司;
【基金】：国家高技术研究发展计划(863计划)(2012AA050206) 国家电网公司科技项目(5292C0140077)~~
【分类号】：TM721.1

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