Journal
IEEE TRANSACTIONS ON ENERGY CONVERSION
Volume 31, Issue 3, Pages 833-845Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2016.2537539
Keywords
Doubly fed induction generators; microgrid frequency regulation; primary frequency control; variable coefficient; virtual inertia control
Funding
- National Natural Science Foundation of China [51207087]
- Shanghai Green Energy Grid Connected Technology Engineering Research Center [13DZ2251900]
- shared facility of Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks, a US National Science Foundation Engineering Research Center [EEC-1041877]
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This paper proposes a variable coefficient combined virtual inertia and primary frequency control strategy for doubly fed induction generators (DFIG) in coordination with diesel generator to participate in wind/photovoltaic/diesel microgrid frequency regulation. The frequency response characteristic is analyzed under different wind speeds with corresponding inertia control parameters different. A 10% wind power margin is preserved through overspeed control and pitch angle control to offset the decrease of wind output power after temporary extra power surge, and provide a permanent frequency support for microgrids. The influence of droop control gain setting is also illustrated under different wind velocities. By continuously adjusting the control parameters according to wind speed variation, a variable coefficient method is realized. The method can guarantee an efficient implementation of this strategy in time-varying conditions. Finally, this coordinated control strategy is tested in a storage-independent microgrid with solar, wind, and diesel generators.
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