An Improved VSG Control Method for Energy Storage Converters

doi:10.3969/j.issn.1000－7229.2018.04.018

Abstract

Abstract: ABSTRACT： This paper proposes the control method of improved VSG （virtual synchronous generator） control method applied to energy storage converter in AC microgrid.According to the problem of active power oscillation in traditional VSG, a virtual reactance module is added to adjust VSG external characteristic reactance with the typical direct-axis transient reactance of synchronous machine as the target value.It can improve the virtual damping coefficient of VSG, and realize the reduction of active power oscillation.According to the problem of irrational reactive power distribution in traditional VSG, the stable AC bus voltage is used as the referencial voltage in excitation control, the method of estimating bus voltage through machine terminal voltage and line parameters is presented.The reasonable droop gain is analyzed and chosen, which realizes the active reactive power decoupling and the rational share of reactive power.Meanwhile, the output power of reactive power can be accurately distributed according to the capacity ratio of each machine.Finally, the simulation system using the proposed method and traditional VSG control is built with MATLAB/Simulink, the effectiveness and superiority of the proposed scheme is verified.

Key words: KEYWORDS： energy storage converter, VSG control, virtual reactance, bus voltage estimation

CLC Number:

YANG Bo1, FENG Xinzhen2, WANG Deshun2, YU Tao3, ZHANG Chenyu4. An Improved VSG Control Method for Energy Storage Converters[J]. Electric Power Construction, 2018, 39(4): 126-.

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