ANALYSIS AND IMPROVEMENT STRTEGY OF GRID-CONNECTED DAMPING CHARACTERISTIC FOR ENERGY STORAGE VSG

Shi Rongliang; Wang Bin; Huang Ji; Wang Guobin; Lan Caihua

doi:10.19912/j.0254-0096.tynxb.2022-0410

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 30-38. DOI: 10.19912/j.0254-0096.tynxb.2022-0410

ANALYSIS AND IMPROVEMENT STRTEGY OF GRID-CONNECTED DAMPING CHARACTERISTIC FOR ENERGY STORAGE VSG

Shi Rongliang^1-3, Wang Bin¹, Huang Ji³, Wang Guobin², Lan Caihua²

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Abstract

In order to solve the problems that the active power dynamic oscillation and steady-state deviation under the condition of active power command and grid frequency disturbance when the energy storage virtual synchronous generator （VSG） is connected to the grid, a transient damping optimization strategy based on the active power differential feedback is proposed in this paper. The energy storage VSG control principle is given, and the grid-connected active closed-loop small-signal model of the energy storage VSG under active power command and grid frequency disturbance is established firstly. After that, the influence law of the damping coefficient on active power dynamic oscillation and steady-state deviation is analyzed. On this basis, a transient damping improvement strategy using an active power differential feedback as well as its parameter design method are given. Finally, the simulation as well as experimental comparison results are used to verify the effectiveness and superiority of the damping optimization strategy in suppressing active power oscillation and eliminating steady-state deviation.

Key words

energy storage virtual synchronous generator / dynamic oscillation / steady-state deviation / transient damping / small-signal model

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Shi Rongliang, Wang Bin, Huang Ji, Wang Guobin, Lan Caihua. ANALYSIS AND IMPROVEMENT STRTEGY OF GRID-CONNECTED DAMPING CHARACTERISTIC FOR ENERGY STORAGE VSG[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 30-38 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0410

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