Next Article in Journal
Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species
Next Article in Special Issue
A Method for Distributed Control of Reactive Power and Voltage in a Power Grid: A Game-Theoretic Approach
Previous Article in Journal
Optimization of Pure-Component LNG Cascade Processes with Heat Integration
Previous Article in Special Issue
Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids
Open AccessArticle

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

1
Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China
2
Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province, North China Electric Power University, Baoding 071003, China
3
School of Electrical & Electronic Engineering, North China Electric Power University, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(1), 203; https://doi.org/10.3390/en11010203
Received: 22 December 2017 / Revised: 4 January 2018 / Accepted: 12 January 2018 / Published: 15 January 2018
(This article belongs to the Special Issue Control and Communication in Distributed Generation Systems)
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. View Full-Text
Keywords: multiple parallel operation; DG inverter; virtual synchronous generator; state-space model; small-signal analysis multiple parallel operation; DG inverter; virtual synchronous generator; state-space model; small-signal analysis
Show Figures

Figure 1

MDPI and ACS Style

Zhang, B.; Yan, X.; Li, D.; Zhang, X.; Han, J.; Xiao, X. Stable Operation and Small-Signal Analysis of Multiple Parallel DG Inverters Based on a Virtual Synchronous Generator Scheme. Energies 2018, 11, 203.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop