Improved droop control strategy for grid-connected inverters
Improved droop control strategy for grid-connected inverters
An improved control strategy for grid-connected inverters within microgrids is presented in this paper. The strategy is based on the classical P-ω and Q-V droop method. The improvement in the proposed control strategy is twofold: Firstly, the transient response of the droop controller is improved by replacing the traditional method of measuring average power, which is based on using a first order low pass filter, by a real time integration filter. This is shown to reduce the imported transient energy when connecting to the grid. Secondly, the steady state output current quality is improved by utilising a virtual inductance, which is shown to reject grid voltage harmonics disturbance and thus improve the output current THD. A small signal model of the inverter based on the transfer function approach is developed to analyse is stability and determine droop gains. Simulation and experimental results are presented to validate the model and demonstrate the controller capabilities.
droop control, mircrogrid, grid-connected inverters
Abusara, M. A.
9b4a8610-217f-4770-a4ea-72d6c4599dae
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Guerrero, J. M.
251fd80c-3d29-4f35-9535-d1b0ac0b6703
Abusara, M. A.
9b4a8610-217f-4770-a4ea-72d6c4599dae
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Guerrero, J. M.
251fd80c-3d29-4f35-9535-d1b0ac0b6703
Abusara, M. A., Sharkh, S.M. and Guerrero, J. M.
(2014)
Improved droop control strategy for grid-connected inverters.
Sustainable Energy, Grids and Networks.
(doi:10.1016/j.segan.2014.10.002).
Abstract
An improved control strategy for grid-connected inverters within microgrids is presented in this paper. The strategy is based on the classical P-ω and Q-V droop method. The improvement in the proposed control strategy is twofold: Firstly, the transient response of the droop controller is improved by replacing the traditional method of measuring average power, which is based on using a first order low pass filter, by a real time integration filter. This is shown to reduce the imported transient energy when connecting to the grid. Secondly, the steady state output current quality is improved by utilising a virtual inductance, which is shown to reject grid voltage harmonics disturbance and thus improve the output current THD. A small signal model of the inverter based on the transfer function approach is developed to analyse is stability and determine droop gains. Simulation and experimental results are presented to validate the model and demonstrate the controller capabilities.
Text
Improved Droop Control accepted_submission_with Reviewer_comments_addressed.docx
- Accepted Manuscript
More information
e-pub ahead of print date: 13 November 2014
Keywords:
droop control, mircrogrid, grid-connected inverters
Organisations:
Mechatronics
Identifiers
Local EPrints ID: 371998
URI: http://eprints.soton.ac.uk/id/eprint/371998
ISSN: 2352-4677
PURE UUID: 85f86a1f-ecef-46c6-9588-5b6ca39e1f01
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Date deposited: 25 Nov 2014 13:51
Last modified: 15 Mar 2024 02:48
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Contributors
Author:
M. A. Abusara
Author:
J. M. Guerrero
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