Suppression of synchronous resonance for VSGs

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Abstract

The virtual synchronous generator (VSG) is an attractive interfacing technique for high-penetration renewable generation. By incorporating the inertia control, the grid-connected voltage-source converter can behave in a similar way with the SGs, which is helpful to enhance the stability of the power system. However, it is reported that the synchronous frequency resonance (SFR) can be aroused in the VSG due to the resonance peaks in the power control loops at the fundamental frequency. By modelling the power control loop in the dq domain, the mechanism underlying the SFR is studied. It reveals the frequency shift of the grid impedance in dq frame is the origin of SFR. Moreover, the phase-amplitude cross-regulation scheme is proposed to suppress the SFR. In this way, the resonance peaks in the power control loops are completely removed, and the coupling effects between the active power and reactive power loops are also eliminated. Therefore, superior power control performances can be achieved. Simulation results verify the effectiveness of the theoretical analysis and both dynamic performance and stability of the power loops are greatly improved by the proposed cross-regulation scheme.
Original languageEnglish
JournalThe Journal of Engineering
Volume2017
Issue number13
Pages (from-to)2574 – 2579
Number of pages6
DOIs
Publication statusPublished - 2017
Event6th International Conference on Renewable Power Generation (RPG) - Wuhan, China
Duration: 19 Oct 201720 Oct 2017

Conference

Conference6th International Conference on Renewable Power Generation (RPG)
CountryChina
CityWuhan
Period19/10/201720/10/2017

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