A Feedforward Control-Based Power Decoupling Strategy for Grid-Forming Grid-Connected Inverters

Baojin Liu, Zhaofeng Song, Bing Yu, Gongde Yang () and Jinjun Liu
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Baojin Liu: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Zhaofeng Song: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Bing Yu: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Gongde Yang: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Jinjun Liu: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2024, vol. 17, issue 2, 1-16

Abstract: Grid-forming inverters, which are represented by droop control and virtual synchronous generator control, have been widely studied and applied because of their excellent grid-supporting ability and smooth off-grid switching. When a grid-forming inverter is connected to a microgrid or utility grid, the control loops of active power and reactive power will be coupled because of the voltage phase difference, which will affect the power control performance. This paper first derives the small-signal linearized model of the system, based on which a frequency feedforward control and an amplitude feedforward control are proposed to decouple the active power and reactive power control loops, respectively. The proposed decoupling strategy directly modifies the reference values through feedforward with an easily implementable principle that is applicable to various control coordinate systems, control coordinate systems, and control structures. By comparing system models with and without the proposed decoupling strategy, its effectiveness can be theoretically proven. Time-domain simulations and hardware experiments are presented to further validate its effectiveness.

Keywords: feedforward control; grid-forming inverter; power decoupling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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