柔性直流技术不仅可以解决广域范围内分布式电源和电动汽车的互补利用问题，而且还可以通过潮流灵活控制，平抑与均衡交流系统各馈线风险，提高系统运行可靠性，是解决分布式可再生能源和电动汽车高渗透接入下风险问题的良好方案。如何合理利用柔性直流优化调度各交流馈线及直流网内可控资源，平抑和均衡各馈线运行风险，是一项具有理论与现实意义的研究课题。本项目围绕基于柔性直流的交直流混联配电系统，以多场景风险建模为基础，研究了不同直流控制模式下的系统转供传输范围与运行边界，提出了平抑风险的交直流协调运行优化方法以及提升直流网对交流网风险支援能力的协调控制策略。本项目的研究成果可以为大规模分布式可再生能源和电动汽车接入下的风险平抑提供运行优化与协调控制方法，并为推动交直流混联配电技术发展、进一步解决该领域后续的自愈重构等问题奠定部分理论及技术基础。

Flexible DC technology can not only solve the complementary utilization problem of wide-area distributed power and electric vehicles, but also stabilize and balance the risks of each feeder of AC system to improve system operation reliability by the flexible control of power flow. It is a good scheme to solve the risk issues under high permeability access of distributed renewable energy and electric vehicles. How to reasonable use of flexible DC to optimal operate each of the AC feeders and controllable resources within DC grids to stabilize and balance the operation risks of feeders is a research topic with theoretical and practical significance. The project, based on multi-scenario risk modeling, studies the transmission range and operation boundary of system transaction under different DC control mode and proposes a AC/DC coordination operation optimization method to stabilize risks and a coordinated control strategy of improving the ability of DC grids’ risk support for AC grids around the AC/DC hybrid power distribution system. The research productions of the project will provide the operation optimization and coordination control method for risk stability under the access of large-scale distributed renewable energy and electric vehicles and lay part of theoretical and technological foundations for promoting the AC/DC hybrid power distribution technology development and further resolving the follow-up problems such as self-healing reconstruction in the field.