scholarly journals Short-Term Load Dispatching Method for a Diversion Hydropower Plant with Multiple Turbines in One Tunnel Using a Two-Stage Model

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1476 ◽  
Author(s):  
Shengli Liao ◽  
Hongye Zhao ◽  
Gang Li ◽  
Benxi Liu
Keyword(s):  
Load Distribution ◽  
Optimal Algorithm ◽  
Hydropower Plant ◽  
Distribution Model ◽  
Stage Model ◽  
Short Term ◽  
Two Stage ◽  
Decomposition Approach ◽  
Optimal Load ◽  
Load Dispatching

Short-term load dispatching (STLD) for a hydropower plant with multiple turbines in one tunnel (HPMTT) refers to determining when to startup or shutdown the units of different tunnels and scheduling the online units of each tunnel to obtain optimal load dispatch while simultaneously meeting the hydraulic and electric system constraints. Modeling and solving the STLD for a HPMTT is extremely difficult due to mutual interference between units and complications of the hydraulic head calculation. Considering the complexity of the hydraulic connections between multiple power units in one tunnel, a two-phase decomposition approach for subproblems of unit-commit (UC) and optimal load dispatch (OLD) is described and a two-stage model (TSM) is adopted in this paper. In the first stage, an on/off model for the units considering duration constraints is established, and the on/off status of the units and tunnels is determined using a heuristic searching method and a progressive optimal algorithm. In the second stage, a load distribution model is established and solved using dynamic programming for optimal load distribution under the premise of the on/off status of the tunnel and units in the first stage. The proposed method is verified using the load distribution problem for the Tianshengqiao-II reservoir (TSQII) in dry season under different typical load rates. The results meet the practical operation requirements and demonstrate the practicability of the proposed method.

Using the Biological Two-Stage Model to Assess Risk from Short-Term Exposures

Risk Analysis ◽  
1988 ◽  
Vol 8 (2) ◽  
pp. 223-230 ◽  
Author(s):  
James J. Chen ◽  
Ralph L. Kodell ◽  
David W. Gaylor
Keyword(s):  
Stage Model ◽  
Short Term ◽  
Two Stage

PSO Based Steel Rolling Process Optimization

2011 ◽  
Vol 346 ◽  
pp. 172-178
Author(s):  
Jun Jun Yang ◽  
Jia Chuan Shi ◽  
Wen Zhang ◽  
Li Ping Liang ◽  
Pei Jian Zhao
Keyword(s):  
Load Distribution ◽  
Rolling Process ◽  
Experimental Result ◽  
Distribution Model ◽  
Total Energy Consumption ◽  
Steel Rolling ◽  
Iron And Steel ◽  
Rolling Mills ◽  
Optimal Load ◽  
Optimal Load Distribution

Based on the analysis of the rolling process in iron and steel enterprises, an optimal load distribution model is established for rolling mills. The objective function is to minimize the total energy consumption. The equipment and process constraints are considered. The particle swarm optimization (PSO) is employed to get the optimal rolling reductions. The simulation of a six-frame strip demonstrates the feasibility of the proposed method in Jinan Iron & Steel Group. The experimental result shows that the proposed method is efficiency in the optimal load distribution problems.

scholarly journals Short-Term Optimal Operation of Baluchaung II Hydropower Plant in Myanmar

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 504
Author(s):  
Jiqing Li ◽  
May Myat Moe Saw ◽  
Siyu Chen ◽  
Hongjie Yu
Keyword(s):  
Flow Distribution ◽  
Optimal Operation ◽  
Hydropower Plant ◽  
Hydropower Station ◽  
Hydropower Generation ◽  
Short Term ◽  
Run Off ◽  
Optimal Load ◽  
Resultant Data ◽  
Actual Operation

The short-term optimal operation model discussed in this paper uses the 2016 to 2018 daily and monthly data of Baluchaung II hydropower station to optimize power generation by minimizing water consumption effectively in order to get more revenue from optimal operation. In the first stage, run-off-river type Baluchaung II hydropower station data was applied in a mathematical model of equal micro-increment rate method for optimal hydropower generation flow distribution unit results. In the second stage, dynamic programming was used to get optimal hydropower generation unit distribution results. The resultant data indicated that optimized results can effectively guide the actual operation run of this power station. The purpose of the optimal load dispatching unit was to consider the optimal power of each unit for financial profit and numerical programming on the actual data of Baluchaung II hydropower plant to confirm that our methods are able to find good optimal solutions which satisfy the objective values of 17.75% in flow distribution units and 24.16% in load distribution units.

scholarly journals Finding Multiple Optimal Solutions to Optimal Load Distribution Problem in Hydropower Plant

Energies ◽  
2012 ◽  
Vol 5 (5) ◽  
pp. 1413-1432 ◽  
Author(s):  
Pan Liu ◽  
Tri-Dung Nguyen ◽  
Ximing Cai ◽  
Xinhao Jiang
Keyword(s):  
Load Distribution ◽  
Hydropower Plant ◽  
Optimal Solutions ◽  
Distribution Problem ◽  
Optimal Load ◽  
Optimal Load Distribution

Timing of repeated movements: Test of a two-stage model

1997 ◽  
Author(s):  
Saul Sternberg ◽  
Teresa Pantzer
Keyword(s):  
Stage Model ◽  
Two Stage

Nonlinear dynamics of pulsating detonation wave with two-stage chemical kinetics in the shock-attached frame

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yaroslava E. Poroshyna ◽  
Aleksander I. Lopato ◽  
Pavel S. Utkin
Keyword(s):  
Wave Propagation ◽  
Detonation Wave ◽  
Model Comparison ◽  
Approximation Order ◽  
Transition Regime ◽  
Stage Model ◽  
Two Stage ◽  
One Dimensional ◽  
Kinetics Of ◽  
Detonation Wave Propagation

Abstract The paper contributes to the clarification of the mechanism of one-dimensional pulsating detonation wave propagation for the transition regime with two-scale pulsations. For this purpose, a novel numerical algorithm has been developed for the numerical investigation of the gaseous pulsating detonation wave using the two-stage model of kinetics of chemical reactions in the shock-attached frame. The influence of grid resolution, approximation order and the type of rear boundary conditions on the solution has been studied for four main regimes of detonation wave propagation for this model. Comparison of dynamics of pulsations with results of other authors has been carried out.

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