中文摘要：

提出了一种适用于单相微电网系统且具备高质量供电电压的并网接口系统。在传统串-并结构拓扑基础上,考虑光伏发电等新能源及其系统的接入,延伸出一组可连接微电网与其他电网的网侧接口系统拓扑。不同于传统功能分配,将并网接口系统中串联变换器配置为功率流的双向控制,同时承担电能质量问题的相互隔离作用;将并联变换器配置为电压工作模式,为本地提供高质量的供电电压,同时利用比例谐振控制器和分裂电容法等技术优化并简化了控制系统的设计,使整体系统性能较之传统串-并架构得以改善。在各种电压扰动情况下,系统可保持当地电网和公共电网之间的功率传输,并为本地负载高质量供电。最后结合一套具体实验系统详述了所提概念并验证了其正确性。

英文摘要：

A kind of grid-interfacing system with enhanced voltage quality is proposed for single-phase microgrid. A group of grid-side topologies are developed based on the conventional serial-parallel structure for the interfacing between grid and microgrid with renewable energy,such as photovoltaic power. Different from the conventional configuration,the serial converter of the proposed grid-interfacing system is reconfigured for the bidirectional control of power flow and the isolation of energy disturbances between microgrid and grid;the parallel converter is reconfigured for the local high-quality power supply in the voltage operating mode. Its control system is optimized and simplified by adopting the proportional and resonant controller and split capacitor for enhancing the overall system performance. It maintains the power transfer between microgrid and grid and keeps the high-quality power supply for local loads under different voltage disturbances. Combined with a lab system,the proposed concept is introduced in detail and validated.