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Finding optimal solutions for reaching maximum power energy of hydroelectric plants in cascaded systems

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Abstract

In this paper, independent optimization operation strategy and global optimization operation strategy for cascaded hydropower plants are studied in aim to maximize total power energy of all the cascaded hydropower plants. In the first strategy, upstream hydropower plants are optimally operated first and then obtained results are used to operate downstream hydropower plants. On the contrary, all hydropower plants are operated simultaneously in the second strategy. The two strategies are accomplished by using an improved cuckoo search algorithm (ICSA) together with particle swarm optimization (PSO), cuckoo search algorithm (CSA), Salp Swarm Algorithm (SSA), sunflower optimization algorithm (SFO), equilibrium optimizer (EO) and marine predator algorithm (MPA). Result comparisons can lead to the evaluation that the first strategy can bring more benefits for upstream plants whereas the second strategy is more suitable for downstream hydroelectric plants. For the purpose of maximizing total energy of all plants, the second strategy is more effective than the first strategy. Compared to PSO, CSA, SSA, SFO, EO and MPA, ICSA method finds higher energy with a highly faster speed. Thus, the paper suggests the second strategy should be executed for hydroelectric plants in cascaded reservoir systems and ICSA can be a favorable method for implementing the recommended optimization operation strategy.

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Abbreviations

α1,n, α2,n, α3n, α4,n, α5,n :

Water discharge function coefficients of the nth hydroelectric plant

α :

Scaling factor selected between 0 and 1

C rp1 , C rp2 , C rp3 , C rp4 , C rp5 , C rp6 :

Randomly picked solutions from the set solution of Ck

\({H}_{n}^{min},{H}_{n}^{max},{H}_{n,i}\) :

The lowest, highest and output of power of the nth hydroelectric plant

I, N :

Interval and hydropower plant number

If n,i :

Inflow into the reservoir n at the period i

λ1, λ2, λ3 :

Randomly generated numbers within 0 and 1

N sol :

Population size

T m,n :

Time of flowing water from the reservoir m to the reservoir n

\({Vl}_{n}^{min}, {Vl}_{n}^{max}\) :

The minimum and maximum volume of the nth reservoir

Vl n,i –1, Vl n,i :

The nth reservoir volume at the end of the (i–1)th and ith intervals

Wd n,i :

Water discharge through turbines of the nth reservoir at the ith interval

\({Wd}_{n}^{min},{Wd}_{n}^{max}\) :

The minimum and maximum discharges through turbines of the nth reservoir

\({Wd}_{m,i-{T}_{m,n}},\mathrm{ }{Ws}_{m,i-{T}_{m,n}}\) :

Discharge and spillage from the upstream reservoir m of the nth reservoir

Ws n,i :

Spillage from the reservoir n at the interval i

V ctv, V dpv :

Control and dependent variable number

F(C k), F(A k):

Fitness function of the solutions Ck and Ak

C Best :

The best solution among the set solution of Ck

F(C Best):

Fitness function of CBest

Wd kn,I :

Discharge of the nth hydroelectric plant at the ith interval in the kth solution

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Correspondence to Thuan Thanh Nguyen.

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Appendix

Appendix

See Table 8.

Table 8 Optimal solution obtained by ICSA for global optimization operation strategy

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Nguyen, T.T., Nguyen, T.T. & Pham, T.D. Finding optimal solutions for reaching maximum power energy of hydroelectric plants in cascaded systems. J Ambient Intell Human Comput 13, 4369–4384 (2022). https://doi.org/10.1007/s12652-021-03361-z

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  • DOI: https://doi.org/10.1007/s12652-021-03361-z

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