Abstract
This paper aims to minimize the generation cost of a low voltage (LV) grid-connected microgrid system using a novel hybrid whale optimization algorithm (WOA)- Sine cosine algorithm (SCA) optimization technique. Three different methods of electricity market prices are formulated in turns and the generation cost is evaluated for each method to sort out the best among them which yields the least generation cost of the same microgrid system. Both active and passive participation of grid are studied to acknowledge its importance. Numerical results show that the time of usage (TOU) method of electricity market pricing proved to be the most convenient and economic method for cost analysis of the system. The generation cost was at its maximum when the electricity price was a constant value. Also during the TOU method of electricity pricing, a 15% surge in the price was realized when the grid was passively participating in supplying power to the system. Figures and statistical data aids the fact that proposed hybrid WOASCA outperformed WOA in consistently providing a robust and superior quality result.
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- LV:
-
Low Voltage
- WOA:
-
Whale Optimization Algorirthm
- SCA:
-
Sine Cosine Algorithm
- TOU:
-
Time Of Usage
- WOASCA:
-
Whale Optimization Algorirthm- Sine Cosine Algorithm
- MG:
-
Microgrid
- DG:
-
Distributed Generation
- DER:
-
Distributed Energy Resources
- RES:
-
Renewable Energy Sources
- AFSA:
-
Artificial Fish Swarm Algorithm
- AIMD:
-
Additive Inverse Multiplicative Decrease
- CuSA:
-
Cuckoo Search Algorithm
- BSA:
-
Backtracking Search Algorithm
- WT:
-
Wind Turbine
- PV:
-
Photo Voltaic System
- FC:
-
Fuel Cell
- CSA:
-
Crow Search Algorithm
- DE:
-
Differential Evolution
- PSO:
-
Particle Swarm Optimization
- GWO:
-
Grey Wolf Optimizer
- NSGA:
-
Non-Dominated Sorted Genetic Algorithm
- DNO:
-
Distribution Network Operator
- BESS:
-
Battery Energy Storage System
- EVB:
-
Electric Vehicle Batteries
- DRM:
-
Demand Response Management
- PC-DRM:
-
Power Company Learning Selection Demand Response Management
- EED:
-
Economic Emission Dispatch
- EMS:
-
Energy Management Strategy
- KHA:
-
Krill Herd Algorithm
- t:
-
Index representing Time
- g:
-
Index representing generators
- F:
-
Fuel cost coefficient
- P:
-
Active power
- I:
-
Binary index representing ON/OFF status
- SU:
-
Start up
- SD:
-
Shut down
- Cgrid :
-
Cost of the grid power exchanged throughout the day
- FP:
-
Fixed price
- ME:
-
Microgrid expense
- GE:
-
Grid expense
- tax:
-
Taxable charge
- PbuyPsell:
-
Power bought/sold to microgrid
- Pgrid :
-
Active power related to the grid
- Max Min:
-
Maximum and minimum values
- ONT/OFFT:
-
Designated on and off time for the generators
- Ton/off :
-
Numbers of successive on and off time of the generator
- G:
-
Distance between whales
- Y:
-
Whale
- Yp :
-
Prey
- A, A, C, l:
-
WOA parameters
- b:
-
Constant for defining the shape of logarithmic spiral
- iter, Max_iter:
-
Iteration, maximum iteration
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Appendix
Appendix
1.1 Realization of the proposed algorithm on the benchmark functions
Any metaheuristic algorithm is inherently stochastic in obtaining the optimal solution for the given problem, which means that the performance varies over different runs. To comment on the suitability and effectiveness of the proposed algorithm, it has been undergone for realization on the set of certain benchmark functions. Here, for the proposed WOASCA method, the authors have used a set of 23 benchmark functions that are mostly used by various researchers [32]. Table
5,
6 and
7 lists the formula, dimensions and variable limits for unimodal, multimodal and fixed dimensional multimodal benchmark functions respectively. All of these functions were evaluated using WOA, SCA and proposed hybrid WOASCA for 30 individual trials. The best values, worst values, their average and standard deviation after 30 runs are listed in Table
8. Figure
Benchmark functions from F1-F23 a 3D Function plot, c Convergence characteristics with the proposed algorithms c Box plot considering values in Table 5
10 displays the 2D Function plot, convergence characteristics with the proposed algorithms and box plot after 30 runs of the 23 benchmark functions for all the 23 benchmark functions.
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Dey, B., Bhattacharyya, B. Comparison of various electricity market pricing strategies to reduce generation cost of a microgrid system using hybrid WOA-SCA. Evol. Intel. 15, 1587–1604 (2022). https://doi.org/10.1007/s12065-021-00569-y
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DOI: https://doi.org/10.1007/s12065-021-00569-y