Abstract
This study proposes a hierarchical control structure for a smooth transition of multi-bus microgrids from islanded mode to grid-connected mode. The proposed control structure uses an average consensus protocol for the secondary control layer and Andronov-Hopf virtual oscillator control as a primary controller. The proposed method enhances the power-sharing accuracy among DGs in normal operation. A synchronization strategy is embedded into the secondary control layer in synchronization mode to force the MG-side voltage at the connection point to synchronize with the grid-side voltage. The influence of the secondary controller and communication time-delay on system stability and performance is analyzed with small-signal analysis. The proposed method is validated via control-hardware-in-the-loop (CHiL) using a real-time Opal-RT platform.
| Original language | English |
|---|---|
| Article number | 9459746 |
| Pages (from-to) | 90441-90454 |
| Number of pages | 14 |
| Journal | IEEE Access |
| Volume | 9 |
| DOIs | |
| Publication status | Published - 1 Jan 2021 |
Funding
This work was supported by the German Federal Ministry for Education and Research through the Project Kopernikus Ensure Phase 2 under Grant 03SFK1C0-2.
| Funders | Funder number |
|---|---|
| Bundesministerium für Bildung und Forschung | 03SFK1C0-2 |
Keywords
- Synchronization
- Voltage control
- Oscillators
- Power system stability
- Microgrids
- Frequency synchronization
- Frequency control
- power system stability
- power system dynamics
- microgrids
- synchronization
- Distributed generation
- power-sharing control
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