Uncertainty In Optimization Of Multi Reservoir Hydroelectric Systems
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Uncertainty In Optimization Of Multi Reservoir Hydroelectric Systems
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Author : Nazanin Shabani
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-09-01
Uncertainty In Optimization Of Multi Reservoir Hydroelectric Systems written by Nazanin Shabani and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-01 with categories.
The main objective of reservoir operation planning is to determine the amount of water released from a reservoir and the amount of energy traded in each time step to make the best use of available resources. This is done by evaluating the trade-off between the immediate and the future profit of power generation while meeting a set of constraints such as the continuity equations, transmission limits, generation and reservoir limits, flood control limits and load resource balance. Another important issue in these problems is uncertainty coming from spatial and temporal variability, inherent nature of a problem or parameter, errors in measurement due to human or technology inaccuracy and modeling errors. This research implements a Reinforcement Learning (RL) optimization algorithm to incorporate flood control constraints of the Columbia River Treaty. It considers the main sources of uncertainty in operating a large scale hydropower system: market prices and inflows by using a number of scenarios of historical data on inflow and energy prices in the learning process. The RL method reduces the time and computational effort needed to solve the operational planning problem.
Representation Of Uncertainty And Corridor Dp For Hydropower Optimization
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Author : Jonathan Richard Lamontagne
language : en
Publisher:
Release Date : 2015
Representation Of Uncertainty And Corridor Dp For Hydropower Optimization written by Jonathan Richard Lamontagne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This thesis focuses on optimization techniques for multi-reservoir hydropower systems operation, with a particular concern with the representation and impact of uncertainty. The thesis reports on three research investigations: 1) examination of the impact of uncertainty representations, 2) efficient solution methods for multi-reservoir stochastic dynamic programming (SDP) models, and 3) diagnostic analyses for hydropower system operation. The first investigation explores the value of sophistication in the representation of forecast and inflow uncertainty in stochastic hydropower optimization models using a sampling SDP (SSDP) model framework. SSDP models with different uncertainty representation ranging in sophistication from simple deterministic to complex dynamic stochastic models are employed when optimize a single reservoir systems [similar to Faber and Stedinger, 2001]. The effect of uncertainty representation on simulated system performance is examined with varying storage and powerhouse capacity, and with random or mean energy prices. In many cases very simple uncertainty models perform as well as more complex ones, but not always. The second investigation develops a new and efficient algorithm for solving multi-reservoir SDP models: Corridor SDP. Rather than employing a uniform grid across the entire state space, Corridor SDP efficiently concentrates points in where the system is likely to visit, as determined by historical operations or simulation. Radial basis functions (RBFs) are used for interpolation. A greedy algorithm places points where they are needed to achieve a good approximation. In a four-reservoir test case, Corridor DP achieves the same accuracy as spline-DP and linear-DP with approximately 1/10 and 1/1100 the number of discrete points, respectively. When local curvature is more pronounced (due to minimum-flow constraints), Corridor DP achieves the same accuracy as spline-DP and linear-DP with approximately 1/30 and 1/215 the number of points, respectively. The third investigation explores three diagnostic approaches for analyzing hydropower system operation. First, several simple diagnostic statistics describe reservoir volume and powerhouse capacity in units of time, allowing scale-invariant comparisons and classification of different reservoir systems and their operation. Second, a regression analysis using optimal storage/release sequences identifies the most useful hydrologic state variables . Finally spectral density estimation identifies critical time scales for operation for several single-reservoir systems considering mean and random energy prices. Deregulation of energy markets has made optimization of hydropower operations an active concern. Another development is publication of Extended Streamflow Forecasts (ESP) by the National Weather Service (NWS) and others to describe flow forecasts and their precision; the multivariate Sampling SDP models employed here are appropriately structured to incorporate such information in operational hydropower decisions. This research contributes to our ability to structure and build effective hydropower optimization models.
Developing A Stochastic Optimization Model For Operating The Manitoba Hydro Multi Reservoir Hydroelectric Power System
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Author : Jacob Snell
language : en
Publisher:
Release Date : 2021
Developing A Stochastic Optimization Model For Operating The Manitoba Hydro Multi Reservoir Hydroelectric Power System written by Jacob Snell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
The province of Manitoba generates more than 90% of its electric power from hydroelectric generating stations located in the Nelson-Churchill Rivers basins. Prudent management of the major reservoirs in the system is essential for providing value through economic and reliable electricity. Reservoir managers are challenged by the variability of reservoir inflows, the misalignment of electrical energy demands and seasonality of reservoir inflows, and travel time lags between reservoirs and major generating stations on the Lower Nelson River. This thesis examines some of the challenges of current hydroelectric system management and applies a Sampling Stochastic Dynamic Programming algorithm to the operation of the Manitoba Hydro electric system. Direct consideration of variability and uncertainty of inflows are incorporated in the algorithm by generating a water value function based policy that considers multiple inflow scenarios and inflow scenario transition probabilities derived from conditional probability distributions based on a regression relationship between sequential periods of system inflow. The travel time lag is incorporated into the algorithm directly as a lagged inflow state variable to bridge reservoir release decisions between time periods. Storage values and penalties are incorporated to reflect operating license requirements and to prevent depletion of reserve storage that can lead to infeasibilities in the algorithm. The water value function policy is simulated over 38 historical years of inflow scenarios and compared against historical reservoir operation decisions. Model results show significant improvement in economic values and reductions in energy deficits over historical scenarios but are highly sensitive to the calibration of storage benefit and penalty values. Extensions to the model to use hydrological based inflow models, improving the transition matrix by evaluating alternative hydrological variables, and alternative approaches to the storage benefit and penalty method are discussed.
Hydrological Dimensioning And Operation Of Reservoirs
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Author : I.V. Nagy
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Hydrological Dimensioning And Operation Of Reservoirs written by I.V. Nagy and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
Storage reservoirs represent one of the most effective tools for eliminating, or at least for minimizing, discrepancies in the time and space variations of water resources distribution and requirements. In fact, the different - often contradictory - and increasing demands on water resources utilization and control usually can be fulfilled only by building multi-purpose reservoir systems. In this way, the available water resources can be exploited and/or managed in a more rational way. Typically, the construction of a dam across a river valley causes water to accumulate in a reservoir behind the dam; the volume of water accumulated in the reservoir will depend, in part, on the dimensions of the dam. The size of the dam will normally affect the capital expenditure in a very significant way. Indeed the construction of large water resource control systems - such as dams - generally involves rather huge manpower and material outlays. Consequently, the elaboration of effectual methods of approach that can be used in establishing the optimal reservoir parameters is of great practical significance. For instance, in the design and operation oflarge multi-reservoir systems, simple simulation and/or optimization models that can identify potentially cost effective and efficient system design are highly desirable. But it should be recognized that the problem of finding optimal capacities for multi-reservoir systems often becomes computationally complex because of the large number of feasible configurations that usually need to be analyzed.
An Explicit Stochastic Optimization Approach To Develop Operating Policies For A Multi Reservoir Hydroelectric System
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Author : Dilip Kumar Sen
language : en
Publisher:
Release Date : 1977*
An Explicit Stochastic Optimization Approach To Develop Operating Policies For A Multi Reservoir Hydroelectric System written by Dilip Kumar Sen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977* with Hydroelectric power plants categories.
The Operation Of Multiple Reservoir Systems
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Author : Zdzisław Kaczmarek
language : en
Publisher:
Release Date : 1982
The Operation Of Multiple Reservoir Systems written by Zdzisław Kaczmarek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Reservoirs categories.
The Influence Of Uncertainty In Stream Flow On Firm Power Commitment In Hydroelectric Power Systems
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Author : Oswaldo Alberto Armitano-Matheus
language : en
Publisher:
Release Date : 1965
The Influence Of Uncertainty In Stream Flow On Firm Power Commitment In Hydroelectric Power Systems written by Oswaldo Alberto Armitano-Matheus and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Hydroelectric power plants categories.
Optimal Long Term Operation Of Electric Power Systems
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Author : G.S. Christensen
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Optimal Long Term Operation Of Electric Power Systems written by G.S. Christensen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Mathematics categories.
This book deals with a very important problem in power system planning for countries in which hydrogeneration accounts for the greatest part of the system power production. During the past thirty years many techniques have been developed to cope with the long-term operation of hydro reser voirs. These techniques have been discussed in a number of publications, but they have not until now been documented in book form. This book is intended as the foundation for a special graduate course dealing with aspects of electrical engineering, operational research, water resource research, and applied mathematics. It may also be used for self study by practicing personnel involved in the planning and operation of hydroelectric power systems for utilities, consulting groups, and government regulatory agencies. The book consists of eight chapters. Chapter 1 reviews the historical developments in the field, discusses briefly all techniques used to solve the problem, and summarizes the modeling of hydroplants for long-term operation studies. At the end of the chapter we present in detail an outline of the book.
Special Topics In Information Technology
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Author : Angelo Geraci
language : en
Publisher: Springer Nature
Release Date : 2021-02-26
Special Topics In Information Technology written by Angelo Geraci and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-26 with Technology & Engineering categories.
This open access book presents thirteen outstanding doctoral dissertations in Information Technology from the Department of Electronics, Information and Bioengineering, Politecnico di Milano, Italy. Information Technology has always been highly interdisciplinary, as many aspects have to be considered in IT systems. The doctoral studies program in IT at Politecnico di Milano emphasizes this interdisciplinary nature, which is becoming more and more important in recent technological advances, in collaborative projects, and in the education of young researchers. Accordingly, the focus of advanced research is on pursuing a rigorous approach to specific research topics starting from a broad background in various areas of Information Technology, especially Computer Science and Engineering, Electronics, Systems and Control, and Telecommunications. Each year, more than 50 PhDs graduate from the program. This book gathers the outcomes of the thirteen best theses defended in 2019-20 and selected for the IT PhD Award. Each of the authors provides a chapter summarizing his/her findings, including an introduction, description of methods, main achievements and future work on the topic. Hence, the book provides a cutting-edge overview of the latest research trends in Information Technology at Politecnico di Milano, presented in an easy-to-read format that will also appeal to non-specialists.
Multi Objective Optimization Of Folsom Reservoir Operation
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Author : Randi Cameron Field
language : en
Publisher:
Release Date : 2007
Multi Objective Optimization Of Folsom Reservoir Operation written by Randi Cameron Field and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.