Optimizing the Layout of Run-of-River Powerplants Using Cubic Hermite Splines and Genetic Algorithms
Abstract
:1. Introduction
1.1. Electrification in Developing Countries and Mini-Hydropower Plants
1.2. Optimization of MHPP
1.3. Contributions
2. Description of the Problem
2.1. Power Generation
2.2. Terrain
2.3. Spline-Based Penstock Layout
2.4. Pipe Curvature
2.5. Cost of the MHPP
2.6. Problem Formulation
2.7. Complexity of the Problem
3. Genetic Algorithm
3.1. Individual Encoding
- The coordinates and corresponding to the end nodes;
- The coordinates of the interior nodes of the penstock, being i the number of each node;
- The height of the nodes relative to the surface of the terrain . Notice that it is a relative value with respect to , which determines the actual height of the terrain;
- The diameter of the penstock .
3.2. Individual Generation
3.3. Mutation Operator
- With a certain probability, , one of the internal nodes can be removed from the individual (see node 4 in Figure 9);
- With a certain probability, , a new node is attached to the individual. This new node is generated through a procedure similar to that in the generation scheme, beginning with the selection of an arbitrary point of the river between the dam and the powerhouse and its later Gaussian displacement (see node 6 in Figure 9).
3.4. Crossover Operator
- 1.
- The offspring is initialized by defining their two end nodes as the lowest and highest nodes contained by the parents;
- 2.
- The interior nodes of both parents are grouped together, and then each of these are being randomly assigned to one offspring;
- 3
- The diameters of the offspring are determined using a simulated binary crossover between the diameters of the parents. This is being and , respectively, the diameter of the two parents, the diameter of the offspring, and are calculated as:
3.5. Fitness Function
4. Simulation Examples and Results
4.1. Scenario Parameters
- (1)
- Modified problem 1 is based on reducing the power output constraint. This models the design of a plant for a much smaller village, with a consequently lower power supply requirement. In particular, the required power output, , has been set to 4-kW.
- (2)
- Modified problem 2 is based on (i) increasing the required power output of the plant and (ii) modifying the costs associated with the pipe and its deployment. The first of these modifications represents the application of the method to supply a more populated village. In particular, the required power output, , has been set to 14-kW. The second of these modifications is based on considering a low quality terrain that strongly makes the transport of the pipe difficult, translating into an increase of its cost per unit length, but eases the excavations labor involved. This has been modeled by using a 1.5 multiplier for , on one hand, and reducing the required cut angle of the excavations, , to 10 and the unitary volumetric cost, , to 2 c.u./m, on the other.
4.2. Algorithm Parameters
4.3. Results
4.4. Comparison with Previous Approaches
5. Conclusions and Further Work
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Parameter | Value |
---|---|
(KW) | 7 |
(m) | 0.022 |
E (GPa) | 200 |
(MPa) | 250 |
(c.u.) | 9 |
(c.u./m) | 8 |
(1/m) | 0.2 |
() | 10 |
(c.u./m) | 13.14 |
(c.u./m) | 99.76 |
(c.u./m) | 616.10 |
Parameter | Value |
---|---|
2000 | |
2000 | |
Generations | 100 |
Selection | Tournament size = 3 |
Generation | Custom generation scheme |
Crossover | Custom crossover scheme |
= 0.50 | |
Mutation | Custom mutation scheme |
Number of trials | 10 |
Diameter range (m) | 0.01–0.33 |
Hyper-parameters | |||||
---|---|---|---|---|---|
0.70 | 0.60 | 0.50 | 0.40 | 0.30 | |
0.30 | 0.40 | 0.50 | 0.60 | 0.70 | |
Final population fitness | |||||
Mean | 22,066.77 | 23,031.35 | 23,397.92 | 22,551.43 | 22,133.37 |
Std. dev. | 991.25 | 876.34 | 345.59 | 583.70 | 828.1163 |
Min | 21,193.04 | 21,836.64 | 23,216.90 | 21,787.5 | 20,966.11 |
Max | 41,083.82 | 48,206.39 | 41,396.83 | 33,011.61 | 25,811.00 |
Best individual | |||||
Gross h. (m) | 80.74 | 84.04 | 86.98 | 82.40 | 79.98 |
Power (W) | 7017.69 | 7000.24 | 7009.17 | 7000.49 | 7003.06 |
Pens. length (m) | 534.56 | 562.24 | 597.30 | 552.59 | 532.42 |
Min, bending radius (m) | 80.00 | 67.36 | 60.00 | 58.07 | 58.99 |
Bending radius allowed (m) | 54.23 | 53.08 | 52.50 | 53.67 | 54.55 |
Pipe diam. (m) | 0.14 | 0.13 | 0.13 | 0.13 | 0.14 |
Cost (c.u.) | 21,193.04 | 1836.64 | 23,216.90 | 21,787.50 | 20,966.11 |
Ref. Problem | Modification 1 | Modification 2 | |
---|---|---|---|
Gross height (m) | 79.98 | 48.98 | 109.49 |
Power (W) | 7003.46 | 4000.19 | 14,000.67 |
Pens. length (m) | 532.42 | 298.75 | 735.37 |
Min. bending radius (m) | 58.99 | 127.72 | 100.00 |
Bending radius allowed (m) | 54.55 | 54.55 | 68.79 |
Pipe diam. (m) | 0.14 | 0.14 | 0.17 |
Cost (c.u.) | 20,966.11 | 11,769.02 | 42,191.30 |
Continuous Approach | Discrete Approach [32] | |
---|---|---|
Gross height (m) | 79.98 | 78.56 |
Power (W) | 7003.06 | 7173.34 |
Pens. length (m) | 532.42 | 523.78 |
Pipe diam. (m) | 0.14 | 0.14 |
Cost (c.u.) | 20,966.11 | 21,590.50 |
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Córdoba, A.T.; Gata, P.M.; Reina, D.G. Optimizing the Layout of Run-of-River Powerplants Using Cubic Hermite Splines and Genetic Algorithms. Appl. Sci. 2022, 12, 8133. https://doi.org/10.3390/app12168133
Córdoba AT, Gata PM, Reina DG. Optimizing the Layout of Run-of-River Powerplants Using Cubic Hermite Splines and Genetic Algorithms. Applied Sciences. 2022; 12(16):8133. https://doi.org/10.3390/app12168133
Chicago/Turabian StyleCórdoba, Alejandro Tapia, Pablo Millán Gata, and Daniel Gutiérrez Reina. 2022. "Optimizing the Layout of Run-of-River Powerplants Using Cubic Hermite Splines and Genetic Algorithms" Applied Sciences 12, no. 16: 8133. https://doi.org/10.3390/app12168133
APA StyleCórdoba, A. T., Gata, P. M., & Reina, D. G. (2022). Optimizing the Layout of Run-of-River Powerplants Using Cubic Hermite Splines and Genetic Algorithms. Applied Sciences, 12(16), 8133. https://doi.org/10.3390/app12168133