柔性多端直流的智能分布调控

Intelligent distributed control for flexible multi-terminal DC network

随着风电、光伏等新能源在传统电力系统中渗透率的增加,常规的交流电网已不能满足远距离、大容量输送电能的需要,柔性多端直流电网将成为区域互联和风电消纳的发展方向。首先对柔性多端直流电网的控制策略进行研究;然后,在每个换流站都设置一个智能体,提出柔性多端直流电网的智能分布调控策略;最后,搭建一个典型的四端柔性直流输电系统进行仿真。仿真结果表明,该控制策略能够同时兼顾集中式控制和分布式控制的优点,每个智能体都能够计划并制定适当的决策,通过TCP/IP协议与其他智能体交换数据,在环境突变(系统故障或者大扰动)的情况下迅速做出反应,减少通信延迟以及上级电网智能体优化计算的时间损耗。

With the increasing penetration of green energy such as wind energy and photovoltaic energy in the traditional power system,conventional AC grid cannot transmit the high capacity of electricity in a long distance,which makes the interconnection of flexible multi-terminal DC network become a future direction of regional power network and wind power consumption.Firstly,the control strategies of flexible multi-terminal DC network are studied.Then,each intelligent agent is set up at every converter station to propose the intelligent distributed control scheme for flexible multi-terminal DC network.Finally,a typical four-terminal flexible DC grid system is set up for simulation,which shows that the control strategy can combine the advantages of centralized control with distributed control,in which each agent will be able to plan and make appropriate decisions,and the exchange of information with other agents via the TCP/IP protocol,as well as the fast response in the emergency situations for the system failures or large disturbances,reducing time delay of communications and optimized calculation for upper grid agents.