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Content Provider | IET Digital Library |
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Author | Ghadimi, Mohammad Nazarzadeh, Jalal |
Abstract | Asymmetrical faults in the grid cause oscillations in dc-link capacitor voltage or overcurrent in the converters. In this study, an optimal controller with a fixed structure is introduced based on the command generator tracker (CGT) to restrict the fault currents and increase stability performance under asymmetrical grid faults. For this purpose, first, the integrated dynamical model including grid-connected converters and dc-link voltage are introduced. Then, using the optimal control techniques, a CGT is designed to enhance the fault ride through performances. Next, the proposed controller is applied to the system including converter and dc-link at the source side and the dynamic performances of the closed-loop system under different fault conditions are determined. Finally, the simulation results are compared with the other conventional controllers and the dynamic performances of the proposed controller are evaluated. The results indicate that the proposed controller provides stability for the system and satisfies allowable constraints of converter current for different grid fault types such as voltage sags, asymmetrical and symmetrical faults. |
Starting Page | 1359 |
Ending Page | 1367 |
Page Count | 9 |
ISSN | 17521416 |
Volume Number | 14 |
e-ISSN | 17521424 |
Issue Number | Issue 8, Jun (2020) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rpg/14/8 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.0366 |
Journal | IET Renewable Power Generation |
Publisher Date | 2020-02-21 |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Asymmetrical Fault Asymmetrical Fault Ride Asymmetrical Grid Fault CGT Closed Loop System Closed-loop System Command Generator Tracker Control of Electric Power System Control System Analysis Control System Synthesis Converter Current Dc-link Capacitor Voltage Dc-link Voltage Different Grid Fault Types Dynamic Performances Fault Current Fixed Structure Grid Cause Oscillations Increase Stability Performance Integrated Dynamical Model Including Grid-connected Converter Optimal Control Optimal Control Technique Optimal Controller Optimal Tracking Control Power Converter Power Generation Control Power Generation Fault Power Grid Power Supplies to Apparatus Power Supply Quality Stability Synthesis Method System Including Converter Voltage Sag |
Content Type | Text |
Resource Type | Article |
Subject | Renewable Energy, Sustainability and the Environment |
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