Proactive Frequency Stability Scheme: A Distributed Framework Based on Particle Filters and Synchrophasors
Abstract
:1. Introduction and Motivation
- Disturbances are detected using the rate of change of frequency (RoCoF).
- The state of frequency is predicted one to three seconds into the future.
- A load excess factor is determined using the predicted state of frequency.
- Using loading data collected at the feeder level, the method finds a suitable combination of load (feeders) that will be dropped in stages to meet the excess load factor and regain load-generation balance.
2. State-of-the-Art
3. Background
3.1. Particle Filter
3.2. Synchrophasors
3.3. Disturbance Detection
3.4. Prediction
Algorithm 1 ADP Generation |
|
3.5. Excess Loading Equations
3.6. Online H Estimation
- Estimation of H is carried out periodically as opposed to in real-time. Historical data and forecasts can be used to reduce the number of times H is estimated. This work uses dynamic loading (modeled from real life data available at [41]), and the procedure is run the equivalent of six times per day. For the case studies presented on Section 5, H is assumed to have been estimated roughly two hours before the events take place.
3.7. Optimizing the Response
Algorithm 2 Load Balance Optimization |
|
4. Overview in Distributed Form
- Adjustable frequency thresholds.
- Adjustable number of load-shedding stages.
- Customizable islands (based on PMU availability).
- Additional parameters such as voltage levels, frequency overshoot, rotor angles, breaker status, and loading of power lines can be integrated as constraints as long as the networks can support it.
- This method eliminates the need for simulations to establish underfrequency load-shedding (UFLS) contingencies.
5. Case Studies
5.1. Illustrative Example
- The PF predicts a rise in frequency.
- The RoCoF is positive.
- Machine synchronization is stable.
5.2. Case Study I
5.3. Case Study II
5.4. Case Study III
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
DER | Distributed Energy Resource |
KF | Kalman Filter |
MILP | Mixed Integer Linear Programming |
PMU | Phasor Measurement Unit |
PF | Particle Filter |
RoCoF | Rate of Change of Frequency |
UFLS | Underfrequency Load-Shedding |
Appendix A
Disturbance Location | Total DER Capacity | Excess Loading |
---|---|---|
1 | 5% | 18% |
2 | 3% | 21% |
3 | 6% | 20% |
4 | 8% | 22% |
Disturbance Location | Machine | Loading % | Total DER Capacity | Excess Loading |
---|---|---|---|---|
1 | 1 | 80% | 5% | 17% |
2 | 85% | |||
3 | 88% | |||
4 | 90% | |||
5 | 85% | |||
2 | 1 | 80% | 4% | 21% |
2 | 90% | |||
3 | 85% | |||
4 | 85% | |||
5 | 80% | |||
3 | 1 | 90% | 5% | 19% |
2 | 88% | |||
3 | 80% | |||
4 | 80% | |||
5 | 85% | |||
4 | 1 | 85% | 2% | 20% |
2 | 85% | |||
3 | 85% | |||
4 | 85% | |||
5 | 85% |
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Bus | V (pu) | (MW) | (MW) | (MVar) | (MW) |
---|---|---|---|---|---|
1 | 1.03 | 615 | - | - | - |
2 | 1.01 | 700 | - | - | - |
3 | 1.03 | 719 | - | - | - |
4 | 1.01 | 700 | - | - | - |
7 | - | - | 967 | 100 | 200 |
9 | - | - | 1767 | 100 | 350 |
Generator | Rating | H | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
(MVA) | (pu) | (pu) | (pu) | (s) | (s) | (pu) | (pu) | (s) | (s) | (s) | |
G1 | 900 | 1.8 | 0.3 | 0.25 | 8 | 0.03 | 1.7 | 0.25 | 0.4 | 0.05 | 6.5 |
G2 | 900 | 1.8 | 0.3 | 0.25 | 8 | 0.03 | 1.7 | 0.25 | 0.4 | 0.05 | 6.5 |
G3 | 900 | 1.8 | 0.3 | 0.25 | 8 | 0.03 | 1.7 | 0.25 | 0.4 | 0.05 | 6.175 |
G4 | 900 | 1.8 | 0.3 | 0.25 | 8 | 0.03 | 1.7 | 0.25 | 0.4 | 0.05 | 6.175 |
Disturbance Location | Method | Number of Stages | % of Load Excess Compensated |
---|---|---|---|
1 | PF | 1 | 50% |
PCF | 3 | 100% | |
2 | PF | 2 | 75% |
PCF | 3 | 100% | |
3 | PF | 2 | 75% |
PCF | 3 | 100% | |
4 | PF | 1 | 50% |
PCF | 3 | 100% |
Disturbance Location | Number of Stages | Overshoot |
---|---|---|
1 | 1 | −0.83% |
2 | 2 | 1.13% |
3 | 2 | 0.91% |
4 | 1 | 2.1% |
Disturbance Location | Method | Number of Stages | % of Load Excess Compensated |
---|---|---|---|
1 | PF | 1 | 50% |
PCF | 3 | 100% | |
2 | PF | 2 | 75% |
PCF | 3 | 100% | |
3 | PF | 1 | 50% |
PCF | 3 | 100% | |
4 | PF | 1 | 50% |
PCF | 3 | 100% |
Disturbance Location | Number of Stages | Overshoot |
---|---|---|
1 | 1 | 2.3% |
2 | 2 | 0.84% |
3 | 1 | −1.72% |
4 | 1 | 1.93% |
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Paramo, G.; Bretas, A. Proactive Frequency Stability Scheme: A Distributed Framework Based on Particle Filters and Synchrophasors. Energies 2023, 16, 4530. https://doi.org/10.3390/en16114530
Paramo G, Bretas A. Proactive Frequency Stability Scheme: A Distributed Framework Based on Particle Filters and Synchrophasors. Energies. 2023; 16(11):4530. https://doi.org/10.3390/en16114530
Chicago/Turabian StyleParamo, Gian, and Arturo Bretas. 2023. "Proactive Frequency Stability Scheme: A Distributed Framework Based on Particle Filters and Synchrophasors" Energies 16, no. 11: 4530. https://doi.org/10.3390/en16114530
APA StyleParamo, G., & Bretas, A. (2023). Proactive Frequency Stability Scheme: A Distributed Framework Based on Particle Filters and Synchrophasors. Energies, 16(11), 4530. https://doi.org/10.3390/en16114530