Real Time-Based under Frequency Control and Energy Management of Microgrids
Abstract
:1. Introduction
- The coordination and power management between DERs during grid-connected and island modes is addressed.
- During intentional islanding or fault, with insufficient DER power, an automatic under frequency load shedding is activated to disconnect the non-critical loads until the system frequency is restored.
- The transient and load shedding operation under highly unbalanced loads connected to the microgrid is also investigated.
- In island mode of operation, the DERs supply the loads and a controller is proposed and implemented for the diesel generator to control the frequency in isochronous mode, by maintaining a constant speed regardless of the load.
2. System Configuration
3. Proposed Control Scheme
3.1. Diesel Generator Model and Control
3.2. Doubly Fed Induction Generator (DFIG) Model and Control
3.2.1. Grid Side Converter (GSC) Control
3.2.2. Rotor Side Converter (RSC) Control
3.3. Load Shedding Scheme
4. Results and Discussion
- (A)
- Grid-connected to islanded mode switching
- (B)
- Load shedding control during fault in islanded mode
4.1. Grid-Connected to Islanded Mode Switching
4.2. Load Shedding Control during Fault in Islanded Mode
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Bus | MVA | pf | P (MW) | Q (Mvar) |
---|---|---|---|---|
1 (Load 1) | 1.518 | 0.9 | 1.37 | 0.66 |
2 (Load 2) | 1.1 | 0.95 | 1.045 | 0.343 |
3 (Load 3) | 1.032 | 0.9 | 0.93 | 0.45 |
4 (Load 4) | 1.068 | 0.9 | 0.96 | 0.47 |
Bus | Phase A (KVA) | Phase B (KVA) | Phase C (KVA) | pf |
---|---|---|---|---|
5 (Load 5) | 325 | 625 | 100 | 0.95 |
6 (Load 6) | 125 | 725 | 300 | 0.95 |
7 (Load 7) | 275 | 625 | 150 | 0.95 |
Stages (Priority) | Criteria | Time(s) | Load |
---|---|---|---|
1 | 0.1 | Load 1 | |
2 | 0.08 | Load 2 | |
3 | 0.08 | Load 3 | |
4 | 0.08 | Load 4 |
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Worku, M.Y.; Hassan, M.A.; Abido, M.A. Real Time-Based under Frequency Control and Energy Management of Microgrids. Electronics 2020, 9, 1487. https://doi.org/10.3390/electronics9091487
Worku MY, Hassan MA, Abido MA. Real Time-Based under Frequency Control and Energy Management of Microgrids. Electronics. 2020; 9(9):1487. https://doi.org/10.3390/electronics9091487
Chicago/Turabian StyleWorku, Muhammed Y., Mohamed A. Hassan, and Mohamed A. Abido. 2020. "Real Time-Based under Frequency Control and Energy Management of Microgrids" Electronics 9, no. 9: 1487. https://doi.org/10.3390/electronics9091487