Analysis, Design, and Implementation of Virtual Impedance for Power Electronics Interfaced Distributed Generation

This paper presents a virtual impedance design and implementation approach for power electronics interfaced distributed generation (DG) units. To improve system stability and prevent power couplings, the virtual impedances can be placed between interfacing converter outputs and the main grid. Howeve...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on industry applications 2011-11, Vol.47 (6), p.2525-2538
Main Authors: He, Jinwei, Li, Yun Wei
Format: Article
Language:English
Subjects:
Adaptive control systems
Adaptive virtual impedance
Couplings
Design engineering
distributed generation (DG)
Electronics
fault ride-through
Harmonics
Impedance
microgrid
parallel inverters
Performance enhancement
Power control
power sharing
Power system stability
Reactive power
Stability analysis
Studies
Systems stability
Transient analysis
virtual impedance
Voltage control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper presents a virtual impedance design and implementation approach for power electronics interfaced distributed generation (DG) units. To improve system stability and prevent power couplings, the virtual impedances can be placed between interfacing converter outputs and the main grid. However, optimal design of the impedance value, robust implementation of the virtual impedance, and proper utilization of the virtual impedance for DG performance enhancement are key for the virtual impedance concept. In this paper, flexible small-signal models of microgrids in different operation modes are developed first. Based on the developed microgrid models, the desired DG impedance range is determined considering the stability, transient response, and power flow performance of DG units. A robust virtual impedance implementation method is also presented, which can alleviate voltage distortion problems caused by harmonic loads compared to the effects of physical impedances. Furthermore, an adaptive impedance concept is proposed to further improve power control performances during the transient and grid faults. Simulation and experimental results are provided to validate the impedance design approach, the virtual impedance implementation method, and the proposed adaptive transient impedance control strategies.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2011.2168592