Derivation of Monthly Operating Rules for Cascade Hydropower Stations Based on SVM

2013 ◽  
Vol 838-841 ◽  
pp. 1673-1676
Author(s):  
Ting Zhou ◽  
Chang Ming Ji ◽  
Bi Kui Zhao
Keyword(s):  
River System ◽  
Optimization Method ◽  
Optimal Operation ◽  
Support Vector ◽  
System Operation ◽  
Optimal Operating ◽  
Operating Rules ◽  
Hydropower Stations ◽  
System Power

In order to promote the efficiency of actual hydropower system operation under limited inflow forecast, an Implicit Stochastic Optimization method using Support Vector Machine (SVM) theory is proposed in this paper to derive long-term optimal operating rules. By applying the model to the Jinsha-Yangtze river system which is the largest hydropower base in China, fitting performance of operating rules is explained and evaluated. System simulation results are given and compared to deterministic optimal operation. Power output processes comparison shows that the average annual system power generation in two scenarios are 395TWh and 392TWh, and the overall operation processes are in well accordance with explicable inconsistency, which proves the efficiency of SVM in operating rules derivation for hydropower stations.

scholarly journals Optimal Operation of Isolated Microgrids Considering Frequency Constraints

2019 ◽  
Vol 9 (2) ◽  
pp. 223 ◽  
Author(s):  
Josep-Andreu Vidal-Clos ◽  
Eduard Bullich-Massagué ◽  
Mònica Aragüés-Peñalba ◽  
Guillem Vinyals-Canal ◽  
Cristian Chillón-Antón ◽  
...  
Keyword(s):  
Optimization Problem ◽  
Maximum Load ◽  
Optimization Method ◽  
Optimal Operation ◽  
System Operation ◽  
Frequency Constraints ◽  
Autonomous Operation ◽  
Frequency Constraint ◽  
Photovoltaic Power ◽  
Pv Generation

Isolated microgrids must be able to perform autonomous operation without external grid support. This leads to a challenge when non-dispatchable generators are installed because power imbalances can produce frequency excursions compromising the system operation. This paper addresses the optimal operation of PV–battery–diesel-based microgrids taking into account the frequency constraints. Particularly, a new stochastic optimization method to maximize the PV generation while ensuring the grid frequency limits is proposed. The optimization problem was formulated including a minimum frequency constraint, which was obtained from a dynamic study considering maximum load and photovoltaic power variations. Once the optimization problem was formulated, three complete days were simulated to verify the proper behavior. Finally, the system was validated in a laboratory-scaled microgrid.

scholarly journals Optimal Operation Model of Drainage Works for Minimizing Waterlogging Loss in Paddy Fields

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2811
Author(s):  
Zhenyang Liu ◽  
Yujiang Xiong ◽  
Juzeng Xu ◽  
Shihong Yang ◽  
Zewei Jiang ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Global Climate ◽  
Operation Time ◽  
Extreme Rainfall ◽  
River System ◽  
Optimization Method ◽  
Optimal Operation ◽  
Irrigation District ◽  
Adaptive Genetic Algorithm ◽  
Extreme Rainfall Events

The risk of flood or waterlogging in irrigation districts has increased due to global climate change and intensive human activities. A Model of Optimal Operation of Drainage Works (MOODW) for flat irrigation district was established by incorporating the hydrological model of waterlogging process and waterlogging loss estimation, which was solved by an optimization method of genetic algorithm. The model of waterlogging process was built based on a modified Tank model and hydrodynamic model for the ditch-river system. The waterlogging loss is calculated under the condition of inconstant inundated depth by linear interpolation. The adaptive genetic algorithm with the global optimization function was selected to solve the model. With an extreme rainfall events in Gaoyou irrigation district as cases, results showed that operation time and numbers of pumps increased; thus, operating costs were 1.4 times higher than before, but the yield loss of rice decreased by 35.4% observably. Finally, the total waterlogging loss was reduced by 33.8% compared with the traditional operation of waterlogging work. The most significant improvement was found in units with high waterlogging vulnerability. The MOODW can provide the waterlogging information visually and assist the district manager in making a reasonable decision.

scholarly journals A rapid solution adjustment strategy in solving Long-term scheduling of large cascade hydropower stations

2018 ◽  
Vol 246 ◽  
pp. 01123
Author(s):  
Chao Wang ◽  
Liang Ji ◽  
Peibing Song ◽  
Xin Hu ◽  
Jiahui Sun
Keyword(s):  
Power Generation ◽  
Linear Optimization ◽  
Electrical Power ◽  
Optimal Operation ◽  
Electrical Power System ◽  
Adjustment Strategy ◽  
Cascade Hydropower Stations ◽  
Rapid Adjustment ◽  
Hydropower Stations

Due to the great potential of large cascade hydropower stations on power generation, long-term scheduling of large cascade hydropower stations (LSLCHS) plays an important role in electrical power system. As more and more concentrations focused on the optimal operation of large cascade hydropower stations, the LSLCHS has been taken into a multi-dimensional, non-convex and non-linear optimization problem due to its complicated hydraulic connection relationships and varieties of complex constraints with considering its power generation, shipping and ecological characteristics. In order to solve this problem, a strategy of solution rapid adjustment regarding the principle of monotone principle is proposed accordingly. The simulation results show that the proposed method is an efficient for solving joint optimization dispatch model of cascade hydropower stations with fast convergent rate, strong robustness.

scholarly journals The optimal equilibrium operation between power generation and ecology of Qingjiang cascade hydropower stations

2018 ◽  
Vol 246 ◽  
pp. 01063
Author(s):  
Yinghai Li ◽  
Wei Lin ◽  
Jiali Guo ◽  
Qingqing Xia ◽  
Wang Li
Keyword(s):  
Power Generation ◽  
Scientific Method ◽  
River System ◽  
Water Shortage ◽  
Optimal Operation ◽  
Complex Model ◽  
Evaluation Index System ◽  
Cascade Hydropower Stations ◽  
Frequency Calculation ◽  
Hydropower Stations

Ecological operation of cascade hydropower stations is one of the most important methods for the ecological restoration of a river system. In order to balance the benefits between power generation and ecology of Qingjiang cascade hydropower station, an optimal equilibrium operation method is proposed in this paper. Firstly, the range of ecological flow of the Qingjiang cascade is calculated by using ten-day frequency calculation method. Secondly, an optimal equilibrium operation model by considering the balance between power generation and ecology is established. And then, in order to solve this complex model, a particle swarm optimization based model solution method is proposed, and the evaluation index system of operation schemes is established. Finally, through operation calculation in 2008-2010 years, the results show that compared with the operation scheme considering only power generation benefit, the optimal equilibrium operation scheme increases the runoff ecological dispersion coefficient by 6.90%，reduces the cascade ecological overflow by 7.739 billion m3 and the cascade ecological water shortage by 130 million m3, while the cascade power generation decreases slightly by 1.83%. This study provides an effective scientific method for the optimal operation of Qingjiang cascade under the background of Yangtze River protection.

scholarly journals Robust Scheduling Optimization Model for Combined Cooling, Heating and Power System in Industrial Parks

2022 ◽  
Vol 2160 (1) ◽  
pp. 012048
Author(s):  
Qingkun Tan ◽  
Lin Chen ◽  
Peng Wu ◽  
Hang Xu ◽  
Wei Tang ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Energy System ◽  
Optimization Method ◽  
Optimal Operation ◽  
Industrial Park ◽  
System Operation ◽  
Operation Optimization ◽  
Environmental Objectives ◽  
Combined Cooling

Abstract The multi energy complementary system is a new power energy technology Firstly, we studied renewable energy and load uncertainties of an operation optimization system, and established the industrial park energy system, which includes wind power, photovoltaic power, a combined cooling, heating and power system, and an energy storage tank. Secondly, given the renewable energy uncertainties of unit output and load, we introduced a robust multi-objective operation optimization method for industrial park energy supply systems while considering conservative system operation. Thirdly, we examined the synergetic and game relationship among multiple objectives. The particle swarm optimization algorithm is was used to optimize the system operation scheme, reduce the feasible domain, and improve the efficiency of the solution. Finally, the simulation results show that the operation optimization method effectively uses the demand response to optimize economic and environmental objectives and ensure the optimal operation efficiency of the system under multiple uncertainties.

Extremum Control for Optimal Operating Point Determination and Set Point Optimization Via Sliding Modes

2000 ◽  
Vol 122 (4) ◽  
pp. 719-724 ◽  
Author(s):  
I˙brahim Haskara ◽  
U¨mit O¨zgu¨ner ◽  
Jim Winkelman
Keyword(s):  
Time Scale ◽  
Closed Loop ◽  
Sliding Mode ◽  
Operation Mode ◽  
Research Problem ◽  
Optimization Method ◽  
Optimal Operation ◽  
Operating Point ◽  
Limited Information ◽  
Optimal Operating

In the design of a control system, it is often desirable to operate at the peak of an appropriate performance surface which characterizes the performance of the closed-loop operation. However, in many cases, only limited information might be available on the plant and the desired performance criterion which makes a priori determination of such an optimal operation mode difficult in the first place. The online identification of an optimal operating point and the development of a controller structure which enables the system to robustly operate at such a point constitute a remarkable research problem with this motivation. In this paper, a two-time scale sliding mode optimization method is studied for this purpose. The adopted scheme assumes a regulative controller which produces an equilibria for the closed-loop system parametrized by a free control parameter and employs a sliding mode optimization method to adapt this parameter in a slower time scale to increase the performance of the overall system. A simulation study is summarized to illustrate the approach. [S0022-0434(00)01004-2]

Long-term optimal operation of cascade hydropower stations based on the utility function of the carryover potential energy

2020 ◽  
Vol 580 ◽  
pp. 124359 ◽  
Author(s):  
Qiao-Feng Tan ◽  
Xin Wen ◽  
Guo-Hua Fang ◽  
Yong-Qiang Wang ◽  
Guang-Hua Qin ◽  
...  
Keyword(s):  
Potential Energy ◽  
Utility Function ◽  
Optimal Operation ◽  
Cascade Hydropower Stations ◽  
Hydropower Stations

Optimal Operation of Complicated Giant Hydropower Stations Based on Decomposition-Coordination Method

2011 ◽  
Vol 356-360 ◽  
pp. 2316-2319
Author(s):  
Kan Yang ◽  
Guo Shuai Liu ◽  
Yong Huai Hao ◽  
Ran Zhou ◽  
Jiao Zheng ◽  
...  
Keyword(s):  
Power Systems ◽  
Optimization Criterion ◽  
Optimal Operation ◽  
Total Output ◽  
Three Gorges ◽  
Convergence Conditions ◽  
Hydropower Plants ◽  
Flow Propagation ◽  
Hydropower Stations ◽  
System Power

Aiming at the problem of joint optimal operation at the five hydropower plants of Three Gorges and Qing River cascades, the paper adopts three-class structure to decompose and coordinate the optimal problem, which takes the maximum system power benefit as the optimization criterion under considering the flow propagation and the variable price factor. This paper derives the iterative formula of decomposition coordination method and identifies the convergence conditions of problem. The study case of Three Gorges and Qing River cascades in different conditions shows that total output of joint optimal operation is bigger than that of cascade single operation. Three Gorges and Shuibuya with large capacity of regulation, have larger output in power systems correspondingly when inflow is the same. In addition, this method is also effective in reducing the resolving time of giant hydropower stations optimal operation and improving the operational efficiency.

Basic principles for assessing the safety of fish products from the ponds exposed to the influence of nuclear fuel cycle enterprises

2019 ◽  
pp. 106-114
Author(s):  
A. V. Trapeznikov ◽  
V. N. Trapeznikova ◽  
A. V. Korzhavin ◽  
V. N. Nikolkin ◽  
A. P. Plataev
Keyword(s):  
Fuel Cycle ◽  
Specific Activity ◽  
River System ◽  
Food Product ◽  
Human Consumption ◽  
Basic Principles ◽  
Fish Products ◽  
Permissible Levels ◽  
Irtysh River

Relevance. In connection with the development of nuclear energy, many aquatic ecosystems have been exposed to radioactive substances. Fish, as an element of biota, is capable to accumulate radionuclides. However, fish is a traditional food. The control of the technogenic radionuclides accumulation level in the ichthyofauna is an important link in ensuring human security.Intention. To analyze the long-term data on the content of long-lived technogenic radionuclides 90Sr and 137Cs in the ichthyofauna of the Ob-Irtysh river system for the period from 2004 to 2016 and Beloyarsky pond for the period from 1977 to 2018.Methodology. Fish as a food product was assessed according to two criteria: a) permissible levels of specific activity of radionuclides (SanPiN 2.3.2.1078-01); b) using the indicator of conformity B and the uncertainty of its definition В (GOST 32161-2013 and GOST 32163-2013).Results and Discussion. Fish of all species that live in the river Tetcha, is not suitable for food use according to the criteria of SanPiN 2.3.2.1078-01, GOST 32161-2013 and GOST 32163-2013. The fish of the Ob-Irtysh river system, the habitat of which is located outside the Tetcha, meets the requirements for fish products. In the period from 1977 to 1989 in the Beloyarsk pond the accumulations of technogenic radionuclides in fish in quantities exceeding sanitary and hygienic standards were possible. Currently, the fish of the Beloyarsky pond fully complies with the sanitary and hygienic requirements for the radiation factor and is safe for human consumption.Conclusion. In the ponds exposed to the atomic energy enterprises, it is necessary to continuously monitor the content of long-lived technogenic radionuclides in fish and assess their amount in accordance with the requirements of SanPiN 2.3.2.1078-01 and using the conformity indicator В and the uncertainty of its determination В. 

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