面向高效供电和多端相互支撑的交直流混联配电运行控制研究

The AC-DC hybrid distribution network can not only provide reliable DC power to ensure access to various kinds of loads and generation devices and enhance efficiency, but also the power flow of different AC lines can be controlled by interlinking converter to optimize system operation and support voltage each other. This is a theoretical and practical problem how to handle the operation point of AC-DC hybrid distribution network, which achieve mutual support and economic and efficient operation. The application analyses the negative impedance stability of multi-converters and its impact on AC/DC, proposes system operation optimization method of high efficiency power supply and multi-terminal mutual support, and completes the coordination control of AC-DC multi-terminals support, to enhance the whole power supply ability and efficiency and distribution access capabilities. The research results of the application can provide optimization operation and coordinated control method to ensure security and efficiency power supply for AC-DC hybrid distribution network, at the same time drive the development of AC-DC hybrid system technology, further laid the theoretical and technology basis to solve self-healing and refactoring, operation reliability or other issues.

交直流混联配电结构不仅可以提供可靠的直流供电以保障多类型直流负载、发电设备的接入，提高使用效率，而且也可以利用互联变流站控制交直流之间以及不同交流线路之间的潮流，来优化系统运行，相互支撑电压。如何合理调整交直流混联配电系统运行点既实现相互支撑又完成整体的经济高效运行，是一项具有理论与现实意义的研究课题。本申请针对交直流混联配电系统的高效供电和多端相互支撑，分析多变换器的负阻抗稳定性及其影响下的交直流耦合，提出面向高效供电和交直流相互支撑的系统运行优化方法，并进行交直流多端相互支撑的协同控制，以提升整体的供电能力、供电效率以及分布式发电接入能力。本申请的研究成果可以为交直流混联配电系统的安全高效供电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、运行可靠性等问题奠定部分理论及技术基础。

多端交直流混联系统将成为未来配电的一种重要形式，如何合理调整交直流混联配电系统运行点既实现相互支撑又完成整体的经济高效运行，是一项具有理论与现实意义的研究内容。本项目围绕交直流混联配电系统，分析了多变换器的负阻抗稳定性及其影响下的交直流耦合特性，获取系统小扰动、大扰动下的稳定运行边界；提出了面向高效供电和交直流相互支撑的系统运行优化方法，并进行了交直流多端相互支撑的协同控制，以提升整体的供电能力与供电效率。本项目的研究成果能够为交直流混联配电系统的安全高效供电提供行之有效的稳定性分析、运行优化与协调控制方法，为推动交直流电网发展奠定了部分理论与技术基础。