Stable Operation and Small-Signal Analysis of Multiple Parallel DG Inverters Based on a Virtual Synchronous Generator Scheme

Bo Zhang, Xiangwu Yan, Dongxue Li, Xueyuan Zhang, Jinzuo Han and Xiangning Xiao
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Bo Zhang: Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Xiangwu Yan: Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Dongxue Li: Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Xueyuan Zhang: Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Jinzuo Han: Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
Xiangning Xiao: School of Electrical & Electronic Engineering, North China Electric Power University, Beijing 102206, China

Energies, 2018, vol. 11, issue 1, 1-22

Abstract: For a high penetration level of distributed energy resources (DERs) in the grid, virtual synchronous generator (VSG) control is applied to the power electronic converters to mimic the rotating mass and damping property of a conventional synchronous generator (SG), which can support virtual inertia and damping for the power system. For VSG control, a phase locked loop (PLL) is needed to estimate the angular frequency of the point of common coupling (PCC); however, the deviation of PLL will affect the accuracy of the active power reference, and even the VSG stability control. From this perspective, an enhanced active power controller without PLL was proposed for VSG control. Furthermore, an accurate small-signal model of the multiple parallel VSGs system that considers the dynamic characteristics and the changing of a steady state operation point was derived for system analysis and parameter design. Based on this model, the influence rules of the eigenvalues by droop and virtual inertia were acquired. The simulation and experimental results are presented to verify the validity of the proposed active power controller and parameter design rules.

Keywords: multiple parallel operation; DG inverter; virtual synchronous generator; state-space model; small-signal analysis (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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