基于高频化磁耦合的多端口级联型中高压大功率变换器拓扑推演及分层控制策略研究

With the more extensive application of distributed photovoltaic power generation and local consumption, multi-line flexible switch connection in distributed grid and the frequency conversion control of high-voltage motor groups in industrial field, from the perspective of system integration and efficiency promotion, system structure simplification and costs reduction, simultaneously in order to improve the theory of multi-port cascaded multilevel converter topology, and further expand to four ports and above, this project proposes the expansion concept of multi-port cascaded medium high voltage high-power converter based on high frequency magnetic coupling, and gives a multi-port extensible cascade AC/AC converter topology family. The objective of this project is to achieve the consumption of photovoltaic power, flexible connection in distributed grid, and unified coordinated control of high power motor groups which is accessed to medium or high-voltage multi-source multi-load power electronic system. This case the research of topology derivation rules and mechanism of multi-port cascaded AC/AC converter based on high frequency magnetic coupling; the research series-parallel module control for high frequency asymmetric multi-winding magnetically coupled bidirectional converter; the research of hierarchical control strategy in typical scenario for multi-port cascaded AC/AC converter based on high frequency magnetic coupling are to be carried out. Through the combination of high frequency magnetic coupling and partial module hybrid cascade, the topology family of medium or high-voltage high-power multi-source multi-load cascaded AC/AC is propelled to extend to three ports and above.

随着分布式光伏发电与就地消纳、配网多线路柔性开关联结以及工业现场高压电机群变频控制应用越来越广泛，从提高系统集成度、效率以及简化系统结构和降低成本目的出发，同时为了完善多端口级联多电平变换拓扑理论体系，并进一步向四端口及以上拓展，本项目提出高频化磁耦合的级联型中高压大功率变换拓扑的多端口拓展概念，并给出一个多端口可拓展级联型AC/AC变换拓扑族，目的是实现光伏消纳、配网柔性联接以及大功率电机群多源多负荷接入中高压电力电子系统进行统一协调控制，由此展开磁耦合多端口级联型AC/AC变换拓扑推演规律及工作机理研究；高频化磁耦合的多端口级联型AC/AC变换拓扑多模块串并联控制研究；典型场景下高频化磁耦合多端口级联型AC/AC变换器分层控制策略研究。通过高频化磁耦合与部分单元混合级联相结合推动中高压大功率多源多负荷接入的级联型AC/AC变换拓扑族进一步向三端口以上拓展。

随着分布式光伏发电与就地消纳、配网多线路柔性开关联结以及工业现场高压电机群变频控制应用越来越广泛，从提高系统集成度、效率以及简化系统结构和降低成本目的出发，同时为了完善多端口级联多电平变换拓扑理论体系，并进一步向四端口及以上拓展，本项目提出高频化磁耦合的级联型中高压大功率变换拓扑的多端口拓展概念，并给出一个多端口可拓展级联型AC/AC变换拓扑族，目的是实现光伏消纳、配网柔性联接以及大功率电机群多源多负荷接入中高压电力电子系统进行统一协调控制，由此展开磁耦合多端口级联型AC/AC变换拓扑推演规律及工作机理研究；高频化磁耦合的多端口级联型AC/AC变换拓扑多模块串并联控制研究；典型场景下高频化磁耦合多端口级联型AC/AC变换器分层控制策略研究。通过高频化磁耦合与部分单元混合级联相结合推动中高压大功率多源多负荷接入的级联型AC/AC变换拓扑族进一步向三端口以上拓展。