scholarly journals Short-Term Multi-Objective Optimal Operation of Reservoirs to Maximize the Benefits of Hydropower and Navigation

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1272 ◽  
Author(s):  
Tianlong Jia ◽  
Hui Qin ◽  
Dong Yan ◽  
Zhendong Zhang ◽  
Bin Liu ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Water Level ◽  
Evaluation Method ◽  
Economic Benefits ◽  
Optimal Operation ◽  
Short Term ◽  
Multi Objective ◽  
Capacity Evaluation ◽  
Strength Pareto Evolutionary Algorithm ◽  
Approach Channel

Traditional reservoir operation mainly focuses on economic benefits, while ignoring the impacts on navigation. Thus, the economic operation of reservoirs considering navigational demands is of great significance for improving benefits. A navigation capacity evaluation method (NCEM), which evaluates the navigation capacity considering the influence of flow velocity and water level variation on navigation, is proposed to more effectively evaluate the navigation capacity. Based on two-dimensional hydrodynamic numerical simulation, the NCEM accurately calculates the navigation capacity according to detailed flow velocity and water level changes. In addition, a short-term multi-objective optimal operation model considering the upstream and downstream navigation and power generation is established. Then, the Strength Pareto Evolutionary Algorithm (SPEA2) is used to solve the model. To verify the rationality of the method and model, they are applied to the case study of the Xiangjiaba reservoir. The results demonstrate that the method and model can not only provide a series of operation schemes for decision makers of reservoirs, but also direct the ship to pass safely through the approach channel, implying a certain practical value and significance as a reference for the short-term optimal operation of reservoirs in the future.

scholarly journals Formulation and Implementation of Short-Term Optimal Reservoir Operation Schemes Integrated with Operation Rules

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 944 ◽  
Author(s):  
Yanke Zhang ◽  
Jiajie Wu ◽  
Hongjie Yu ◽  
Changming Ji
Keyword(s):  
Evaluation Method ◽  
Optimal Operation ◽  
Operating Conditions ◽  
Control Mode ◽  
Theoretical Research ◽  
Short Term ◽  
Post Evaluation ◽  
Operation Rules ◽  
Actual Operation ◽  
Hydropower Stations

To narrow the gap between theoretical research and practical application of short-term optimal reservoir power generation operation under uncertain conditions, a comprehensive study is conducted on the formulation, evaluation, and implementation of operation schemes throughout the entire procedure of optimal operation. Firstly, the three implementation modes of the optimal operation scheme are assessed with the post-evaluation method. After the optimal implementation mode is determined, the formulation and implementation of optimal operation schemes are improved by combining the advantages of conventional and optimal operation and using the concept of warning water level in operation rules. Finally, the Xiaoxuan Reservoir is taken as an example for simulation calculation under different operating conditions. The results show that the operation model integrated with operation rules has both the security of conventional operation and the profitability of optimal operation. The accordingly-formulated optimal operation schemes, when implemented with the output control mode, can provide valuable guidance for the actual operation of hydropower stations.

scholarly journals Application of Marginal Rate of Transformation in Decision Making of Multi-Objective Reservoir Optimal Operation Scheme

2021 ◽  
Vol 13 (3) ◽  
pp. 1488
Author(s):  
Yueqiu Wu ◽  
Liping Wang ◽  
Yanke Zhang ◽  
Jiajie Wu ◽  
Qiumei Ma ◽  
...  
Keyword(s):  
Power Generation ◽  
Decision Making ◽  
Water Level ◽  
Level Scheme ◽  
Flood Control ◽  
Forecast Error ◽  
Optimal Operation ◽  
Total Power ◽  
Marginal Rate ◽  
Multi Objective

For reservoirs with combined storage capacity for flood control and beneficial purposes, there tends to be potential benefit loss when the flood control limited water level is used in medium and small floods. How to find the optimal water level scheme for profit-making and pursue the optimization of comprehensive benefits has always been a difficult problem in multi-objective reservoir optimal operation. Based on the principle of the maximum benefit obtained by the product conversion curve and the isorevenue line in microeconomics, taking flood control and power generation as two products of a reservoir, a multi-objective optimal operation scheme decision-making model is established to seek the highest water level scheme that can produce the maximum comprehensive benefits of flood control and power generation. A case study of the Three Gorges reservoir in the early flood season of a dry year shows that on the one hand, under the condition of deterministic inflow, the model can work out the optimal water level and the corresponding best equilibrium point for both flood control and power generation, and it can increase the total power output by 4.48% without reducing the flood control benefits; on the other hand, it can also obtain the dynamic control area of the maximum allowable water level for power generation considering inflow forecast error, which provides a theoretical reference for determining the starting water level in medium and small floods and utilizing flood resources.

scholarly journals Optimal Regulation of the Cascade Gates Group Water Diversion Project in a Flow Adjustment Period

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2825
Author(s):  
Jie Zhu ◽  
Zhao Zhang ◽  
Xiaohui Lei ◽  
Xia Yue ◽  
Xiaohua Xiang ◽  
...  
Keyword(s):  
Water Level ◽  
Optimal Operation ◽  
Water Diversion ◽  
Decision Variable ◽  
Optimal Regulation ◽  
Multi Objective ◽  
Flow Adjustment ◽  
Water Diversion Project ◽  
Group Water ◽  
Regulation Model

This study focuses on the regulation demand of the cascade gates group water diversion project during the flow adjustment period. A multi-objective optimization regulation model was coupled with the one-dimensional hydrodynamic model and the multi-objective genetic algorithm. Gate opening was used as the decision variable to generate the local operation-oriented cascade gates group regulation scheme. This study considered the Shijiazhuang to Beijing section of the middle route of the South-to-North Water Diversion Project. The optimal operation model has a better control effect than the conventional control method, and the number of gate operations was reduced by 23.38%. The average water level deviation was less than 0.15 m when the feedforward control time of the cascade gates group water diversion project was not more than 24 h. The basic mechanism of maintaining water level stability during the short-term scheduling of the cascade gates group water diversion project makes use of the volume capacity, or the space of the channel pool adjacent to the water demand change position, in advance. The multi-objective optimal regulation model of the cascade gates group that was constructed in this study can quickly generate regulation schemes for different application scenarios.

Multi-Objective Evaluation Method of Thermal Power Enterprise Cost Effective Research

2013 ◽  
Vol 734-737 ◽  
pp. 1693-1696 ◽  
Author(s):  
Ze Hong Li ◽  
Meng Zhu Chen
Keyword(s):  
Evaluation Method ◽  
Thermal Power ◽  
Cost Benefit ◽  
Cost Effective ◽  
Objective Evaluation ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Multi Objective ◽  
Power Enterprise ◽  
Electre Method

This paper starts from the characteristics of the cost benefit of the thermal power enterprises, Respectively from economic benefits, environmental benefits, social benefits three aspects to establish index system and to evaluate its cost efficiency, by comparing various kinds of multi-objective evaluation method, select the AHP method to determine weights, and select sort with Electre method.

scholarly journals Multi-Objective Sizing Optimization of Hybrid Renewable Energy Microgrid in a Stand-Alone Marine Context

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 174
Author(s):  
Wenqiang Zhu ◽  
Jiang Guo ◽  
Guo Zhao
Keyword(s):  
Renewable Energy ◽  
Optimization Problem ◽  
System Optimization ◽  
Economic Benefits ◽  
Grey Wolf Optimizer ◽  
Grey Wolf ◽  
Energy Management Strategy ◽  
Sizing Optimization ◽  
Multi Objective ◽  
Hybrid Renewable Energy

Islands are the main platforms for exploration and utilization of marine resources. In this paper, an island hybrid renewable energy microgrid devoted to a stand-alone marine application is established. The specific microgrid is composed of wind turbines, tidal current turbines, and battery storage systems considering the climate resources and precious land resources. A multi-objective sizing optimization method is proposed comprehensively considering the economy, reliability and energy utilization indexes. Three optimization objectives are presented: minimizing the Loss of Power Supply Probability, the Cost of Energy and the Dump Energy Probability. An improved multi-objective grey wolf optimizer based on Halton sequence and social motivation strategy (HSMGWO) is proposed to solve the proposed sizing optimization problem. MATLAB software is utilized to program and simulate the optimization problem of the hybrid energy system. Optimization results confirm that the proposed method and improved algorithm are feasible to optimally size the system, and the energy management strategy effectively matches the requirements of system operation. The proposed HSMGWO shows better convergence and coverage than standard multi-objective grey wolf optimizer (MOGWO) and multi-objective particle swarm optimization (MOPSO) in solving multi-objective sizing problems. Furthermore, the annual operation of the system is simulated, the power generation and economic benefits of each component are analyzed, as well as the sensitivity.

scholarly journals Sustainability of Regional Agroecological Economic System Based on Emergy Theory: A Case Study of Anhui Province, China

2021 ◽  
Vol 13 (15) ◽  
pp. 8317
Author(s):  
Xue Wu ◽  
Yaliu Yang ◽  
Conghu Liu ◽  
Guowei Xu ◽  
Yuxia Guo ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Economic System ◽  
Agricultural Development ◽  
Evaluation Method ◽  
Measurement Model ◽  
Economic Benefits ◽  
Anhui Province ◽  
Human Beings ◽  
Emergy Theory ◽  
Operation Status

The agroecological economic system is the basic system on which human beings depend for survival. In order to better evaluate the operation status of a regional agroecological economic system and deepen the cognition of the input and output of the regional agroecological economic system from the angle of emergy, the evaluation method of sustainable development of the regional agroecological economic system with comprehensive consideration of resources, economy, and environment was proposed by constructing a unified dimensional measurement model. This paper analyzed and evaluated the data of the agroecological economic system in Anhui Province from 2010 to 2019. The results showed that the agroecological economic system in Anhui Province bore less environmental pressure and gradually decreased, and had a good system efficiency and economic benefits. The average emergy sustainability index (ESI) was 3.12, indicating that the agroecological economic system in Anhui Province had certain vitality of sustainable development. Based on this, the paper puts forward some suggestions on sustainable and high-quality agricultural development in Anhui Province, which provides theoretical and methodical support for sustainable development of a regional agricultural economy.

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