Current sharing is a main problem in AC power supply system with multiple inverters parallel connected. Some methods are developed to eliminate the loop-current among inverters including droop control and virtual impedance. However, big voltage drop is inevitable for a good current sharing. This paper proposes a novel control algorithm with virtual impedance attenuation, which uses larger virtual impedance when communication is normal to achieve sound performance both of current sharing effect and voltage drop. Moreover, a compromise between current sharing and voltage drop elimination can also be obtained when communication fails. The theoretical analysis of the proposed method is verified through experiments on two three-phase 100kVA inverter prototypes.


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    Title :

    Virtual impedance attenuation based control of parallel inverters


    Contributors:
    Ningning Li, (author) / Xisheng Tang, (author) / Xiaofeng Zhang, (author) / Guowei Zhang, (author) / Xiao Hu, (author)


    Publication date :

    2014-08-01


    Size :

    1892924 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English