Control Strategy of the Pumped Storage Unit to Deal with the Fluctuation of Wind and Photovoltaic Power in Microgrid
Abstract
:1. Introduction
2. The Model Construction of Units Combined Operation in Microgrid
2.1. The Objective Function
2.2. Operating Constraints of Various Types of Units in Microgrid
3. New Control Strategy for Combined Operation of Units in Microgrid
3.1. Evaluation Index of the Effect of the New Control Strategy on the Stabilization of Fluctuation
- (1)
- Time predicts period T0: It can be seen from the forecast of wind-solar power that there are certain deviations in the forecast results, which is the forecast accuracy. In order to better verify the feasibility of the proposed strategy, we assume that the prediction accuracy of wind-solar power is a fixed value within the prediction period.
- (2)
- Fluctuation of unit combined output power ΔPyt: The difference between combined units output power at any time t1 and t2.
- (3)
- Maximum allowable deviation for power fluctuation Dt: Refers to the maximum limit of allowable fluctuation of wind-solar power. Through the combined operation of the pumped storage power station, the wind and photovoltaic output power is smoothed so that the power change is controlled within the set range. That is:Due to the different scale of microgrid system, the acceptable range of wind power and photovoltaic power fluctuation is also different. Therefore, the setting of Dt value should be determined according to the actual situation of microgrid.
- (4)
- The total amount of electrical energy in excess of the fluctuation limit Wpass: That is, in the prediction period, the power fluctuation at all adjacent moments exceeds the sum of the differences of the maximum allowable deviation.
- (5)
- The ratio of the total time when the output fluctuation exceeds the maximum deviation to the dispatching cycle Ppass: That is, the percentage of the total time when the power fluctuation difference of any two moments exceeds the maximum allowable deviation in the prediction period.
3.2. Traditional Combined Unit Scheduling Strategy
3.3. New Combined Unit Scheduling Strategy
- (1)
- Maintain the same state: That is, in the forecast period, the fluctuation of wind-solar power at any time conforms to the specified allowable deviation Dt, and then the output of unit 1 and 2 is not required to stabilize the fluctuation, which is satisfied:
- (2)
- Unit generation regulation: When ΔPt = Py(t+Δt) − Pwt − Pvt > Dt, which means the next moment the wind-solar power will drop dramatically and cause a large deviation, the need for unit 1 reservoir sluice generation regulation, at this time Pg,t > 0, or when the wind-solar power meets the deviation allowable constraint −Dt < ΔPt < Dt at this time, but within the prediction period, it is predicted that there will be ΔPt+kΔt = Py(t+kΔt) − Pwt − Pvt < −Dt at a certain time k in the future. That is, there will be a large number of wind-solar power abandonment. Therefore, unit 2 reservoir is required to conduct pumped storage operation for regulation, but due to the limitation of reservoir capacity, wind and solar electricity cannot be completely absorbed. Therefore, in order to better stabilize the power fluctuation, unit 2 needs to generate part of the electric energy appropriately on the basis of meeting the operating constraints, so as to give consideration to the problem of insufficient capacity at time t + kΔt. The specific expression is:
- (3)
- Unit energy storage regulation: Similarly, when ΔPt = Py(t+Δt) − Pwt − Pvt < −Dt, a large amount of wind-solar power abandoning is generated, and unit 2 is required to conduct energy storage regulation, at this time Pp,t < 0. Or, when the wind-solar power meets the deviation allowable constraint −Dt < ΔPt < Dt at this time, but within the prediction period, something is predicted to happen ΔPt+kΔt = Py(t+kΔt) − Pwt − Pvt > Dt at a certain time k in the future. That is, the wind-solar output power will decrease sharply. Unit 1 reservoir is required to conduct power generation operation to control, but at this time, there is not enough water in the upstream reservoir of unit 1 to generate power and maintain; on the basis of unit 1 meeting operating constraints, it is necessary to store part of the water appropriately, so as to take into account the stability of the combined output of wind power, photovoltaic power, and pumped storage power at time t + kΔt. The specific expression is:
4. Improved Social Particle Swarm Optimization
4.1. Social Particle Swarm Optimization
4.2. The Improvement Strategy of Inertia Weight ω
5. Example Analysis
5.1. System Example Summarize
5.2. Example Result
5.3. Different Algorithm Results Comparison
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Comparison of Results | Typical Day A | Typical Day B | Typical Day C | Typical Day D | ||||
---|---|---|---|---|---|---|---|---|
Wpass | Ppass (%) | Wpass | Ppass (%) | Wpass | Ppass (%) | Wpass | Ppass (%) | |
Traditional strategy | 0.78 MW | 7.13 | 0.21 MW | 0.61 | 2.64 MW | 20.15 | 0.53 MW | 5.15 |
New strategy | 0.27 MW | 2.54 | 0 | 0 | 0.94 MW | 9.12 | 0.15 MW | 1.23 |
Comparison of Results | SPSO | Improved SPSO |
---|---|---|
Typical day A/times | 515 | 297 |
Typical day B/times | 510 | 303 |
Typical day C/times | 508 | 300 |
Typical day D/times | 512 | 301 |
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Wu, G.; Shao, X.; Jiang, H.; Chen, S.; Zhou, Y.; Xu, H. Control Strategy of the Pumped Storage Unit to Deal with the Fluctuation of Wind and Photovoltaic Power in Microgrid. Energies 2020, 13, 415. https://doi.org/10.3390/en13020415
Wu G, Shao X, Jiang H, Chen S, Zhou Y, Xu H. Control Strategy of the Pumped Storage Unit to Deal with the Fluctuation of Wind and Photovoltaic Power in Microgrid. Energies. 2020; 13(2):415. https://doi.org/10.3390/en13020415
Chicago/Turabian StyleWu, Guangyi, Xiangxin Shao, Hong Jiang, Shaoxin Chen, Yibing Zhou, and Hongyang Xu. 2020. "Control Strategy of the Pumped Storage Unit to Deal with the Fluctuation of Wind and Photovoltaic Power in Microgrid" Energies 13, no. 2: 415. https://doi.org/10.3390/en13020415