以多端口互联电流源变流器为核心的微电网群功率变换研究

本项目拟通过研究多端口电流源变流器装备及其高性能控制实现中压微电网群的低成本、高性能柔性互联。主要研究内容包括：1）以模块化电流源为基础，利用串联、并联等方式构建多端口互联电流源变流器拓扑，实现低压分布式电源集群在中压电网的有序汇聚。2）研究多端口互联电流源变流器和多样化低压电压源变流器的相互作用机理及对偶性，探索广义分布式功率控制方法，建立以多端口电流源互联装备为核心的“模块级、装备级、系统级”三级协调控制体系，实现中压微电网群内多层级的灵活潮流控制。3）研究以多端口互联电流源变流器为核心的主动电能质量控制方法，保障中压微电网群的宽频带稳定和振荡抑制，构建基于电流源变流器多模式控制和紧急控制的中压微电网群故障穿越和多模式运行方法，保障关键负荷的优质、可靠供电。本项目的研究对拓展大容量电流源变流器的应用范畴、促进微电网技术的发展和应用，具有重要的理论和现实意义。

This project aims to realize low-cost, high-performance flexible interconnection of medium-voltage microgrid clusters by using the control of multi-port current source converter equipment. The main research contents include: 1) To develop the topology of multi-port interconnection current source converter through series and parallel connection of current source modules in order to realize the orderly connection of low-voltage distributed power sources. 2) To study the interaction mechanism and duality of multi-port interconnection current source converters and diversified low-voltage voltage source converters. To explore the generalized distributed control methods and establish “module-level, equipment-level and system-level” coordinated control architecture by using the multi-port interconnection current source converters in order to realize multi-layer flexible power flow control of the medium-voltage microgrid clusters. 3) To investigate the active power quality control methods by using multi-port interconnection current source converters in order to ensure wide frequency range stability and active resonance damping of the medium-voltage microgrid clusters. And to develop emergency control and multi-mode control of medium-voltage microgrid clusters using multi-port current source converters in order to ensure high-quality and high-reliability power supply for critical loads. The achievements of this project will have important theoretical and practical meaning for expanding the application areas of large-capacity current source converters and promoting the development and application of microgrid technology.