The cascaded H-bridge is considered as one of the most suitable topologies for photovoltaic(PV)power generation.Aimed at the problems of the traditional three-phase cascaded H-bridge PV inverter such as a large capacitor volume,a short service life,inter-phase power mismatch and a complex control communication system,a novel modular three-phase PV inverter and its distributed control strategy are proposed based on the principle of magnetic flux cancellation.First,the basic structure of the proposed modular topology is introduced.Then,the basic principle of magnetic flux cancellation power decoupling and the influencing factors of double-line frequency voltage ripple are analyzed in detail,and a distributed control strategy is proposed to suppress the double-line frequency voltage ripple and ensure the balance of three-phase output power.Finally,the correctness of theoretical analysis and the feasibility of the proposed control strategy were verified by simulation and experimental results.
关键词
光伏级联H桥/功率失配/多端口变换器/功率解耦/分布式控制
Key words
Photovoltaic(PV)cascaded H-bridge/power mismatch/multi-port converter/power decoupling/distributed control
维普
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