Overview
Three parallel inverters operating in islanded mode with P/F and Q/V droop control plus supervisory frequency and voltage restoration.
This example demonstrates islanded operation of an inverter-based microgrid using droop control. It is a strong reference model for studying autonomous operation, power sharing, and voltage-frequency restoration without relying on PLL-based synchronization.
The microgrid contains three parallel inverters rated at 500 kW, 300 kW, and 200 kW. Each inverter includes a two-level converter, LC filter, 480/600 V transformer, DC source, and a complete control system. A dynamic load lets you apply realistic disturbances.
This model is excellent for both research and teaching. It illustrates core microgrid control concepts and gives users something immediately meaningful to discuss: droop tuning, load sharing quality, harmonic reduction, and secondary control performance.
Key Features
- P/F and Q/V droop characteristics
- Power sharing proportional to inverter size
- Supervisory control to restore 60 Hz and 600 V nominal values
- Harmonic analysis possibilities using carrier phase variation
Getting Started
- Run the model and monitor inverter power sharing.
- Observe the load increase at 1 s.
- Watch droop control enable at 3 s.
- See supervisory restoration take effect at 5 s.
Model Specifications
| Parameter | Value |
|---|---|
| Product | SPS Software |
| Simulation type | Real-time |
| Software version | SPS Software 2025+ (with RT-LAB) |
| Recommended time step | Not published — switching content ~2700 Hz; confirm in model |
| Real-time solver | ARTEMiS (CPU real-time) |
| Compatible hardware | OP4605XG2, OP4610XG2, OP5020XG2, OP5025XG2, OP5033XG2, OP5707XG2 |
| Model file | Coming soon |
Downloads
The downloadable model package is coming soon.
Microgrid_IslandedOperation_DroopControl.zip (140.7 KB)
