A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters
Abstract
:1. Introduction
2. Operation Principle
2.1. Droop Control
2.2. Multi-Loop Voltage Control
2.3. Riding-through Algorithm
3. Main Control Parameter Design
3.1. Droop Coefficients
3.2. Multi-Loop Voltage Control
3.3. Virtual Inductance Loop
3.4. Impact on an Inverter-Dominated System
4. Experimental Results
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Description | Symbol | Value | Unit |
---|---|---|---|
Local Load (per phase) | Rload | 50 | Ω |
Filter Inductor | Lf | 5 | mH |
Filter Capacitance | Cf | 20 | μF |
Grid impedance | Zg | 0.2 + j1.885 | Ω |
Description | Symbol | Value | Unit |
---|---|---|---|
Grid voltage (line-line) | Vg | 220 | V |
Grid frequency | fg | 60 | Hz |
Nominal voltage | E0 | 174.7 | V |
Inverter output power | Po | 1000 | W |
Nominal Frequency | ω0 | 377 | rad/s |
P-ω droop | m | −0.0005 | rad/W |
Q-V droop | n | 0 | V/Var |
Filter cut-off frequency | ωc | 62.8 | rad/s |
Nominal virtual inductor | Lvf | 80 | μH |
Initial virtual inductor | Lvi | 3 | H |
Time constant | τ | 0.3 | s |
Proportional gain | kp | 3 | --- |
Differential coefficient | kd | 0.000532 | --- |
Riding-through period | TRD | 10 | ms |
Current threshold | ITH | 10 | A |
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Hu, S.-H.; Lee, T.-L.; Kuo, C.-Y.; Guerrero, J.M. A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters. Energies 2016, 9, 732. https://doi.org/10.3390/en9090732
Hu S-H, Lee T-L, Kuo C-Y, Guerrero JM. A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters. Energies. 2016; 9(9):732. https://doi.org/10.3390/en9090732
Chicago/Turabian StyleHu, Shang-Hung, Tzung-Lin Lee, Chun-Yi Kuo, and Josep M. Guerrero. 2016. "A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters" Energies 9, no. 9: 732. https://doi.org/10.3390/en9090732