Study Of Unit Commitment And Generation Flexibility Planning For Taiwan Power System With A High Wind Power Penetration
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Study Of Unit Commitment And Generation Flexibility Planning For Taiwan Power System With A High Wind Power Penetration
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Author : 張立佐
language : en
Publisher:
Release Date : 2017
Study Of Unit Commitment And Generation Flexibility Planning For Taiwan Power System With A High Wind Power Penetration written by 張立佐 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Evaluating And Planning Flexibility In A Sustainable Power System With Large Wind Penetration
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Author : Juan Ma
language : en
Publisher:
Release Date : 2012
Evaluating And Planning Flexibility In A Sustainable Power System With Large Wind Penetration written by Juan Ma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Generation Scheduling For Power Systems With Demand Response And A High Penetration Of Wind Energy
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Author : Guodong Liu (Power system engineer)
language : en
Publisher:
Release Date : 2014
Generation Scheduling For Power Systems With Demand Response And A High Penetration Of Wind Energy written by Guodong Liu (Power system engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Demand-side management (Electric utilities) categories.
With renewable energy sources and demand response programs expanding in many power systems, traditional unit commitment and economic dispatch approaches are inadequate. The power system is changing to one where there is control with uncertainty for both generation and load. Alternative power system scheduling methods capable of aggregating the uncertainty of wind power and demand response, while maintaining reliable and economic performance are investigated in this work. The research addresses four aspects of these changes. First, a probabilistic method is proposed to maintain uniform system reliability level in the hour-ahead economic dispatch by quantifying different levels of required spinning reserve. The method considers the probability distributions of wind speed and load forecast errors, as well as outage replacement rates of generators by using the expectation of demand not served (EDNS) as an evaluation index. Second, a probabilistic model of security-constrained unit commitment (SCUC) is proposed to determine the optimal amount of spinning reserve when integrating wind generation. An algorithm, which includes the stochastic wind forecast results into a day-ahead unit commitment and extracts its value for system operation of system, is developed. The proposed model determines the optimal amount of spinning reserve in terms of an optimal trade-off between economic efficiency and system reliability. Third, a new duplex demand response model is proposed to allow demand to bid into both the energy and spinning reserve markets. A co-optimized day-ahead energy and spinning reserve market is proposed to minimize the expected net cost under any credible system state, i.e., expected total cost of operation minus total benefit of demand. The problem is solved by MILP. Compared with conventional demand shifting bids, the proposed model can reduce system operating cost. Fourth, a robust UC model to minimize the generalized social cost is proposed. Compared to the traditional UC to maximize the social welfare, the proposed model more effectively manages uncertainty in demand response to price changes. The solution is robust against all possible modeled realizations of the uncertain demand response.
Effect Of Generation Flexibility On The Operating Cost With High Penetration Of Renewable Energy In Taiwan
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Author : 黃思儒
language : en
Publisher:
Release Date : 2019
Effect Of Generation Flexibility On The Operating Cost With High Penetration Of Renewable Energy In Taiwan written by 黃思儒 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Bi Level Optimization Considering Uncertainties Of Wind Power And Demand Response
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Author : Xin Fang
language : en
Publisher:
Release Date : 2016
Bi Level Optimization Considering Uncertainties Of Wind Power And Demand Response written by Xin Fang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Electric network analyzers categories.
Recently, world-wide power systems have been undergone a paradigm change with increasing penetration of renewable energy. The renewable energy is clean with low operation cost while subject to significant variability and uncertainty. Therefore, integration of renewables presents various challenges in power systems. Meanwhile, to offset the uncertainty from renewables, demand response (DR) has gained considerable research interests because of DR’s flexibility to mitigate the uncertainty from renewables. In this dissertation, various power system problems using bi-level optimization are investigated considering the uncertainties from wind power and demand response. In power system planning, reactive power planning (RPP) under high-penetration wind power is studied in this dissertation. To properly model wind power uncertainty, a multi-scenario framework based on alternating current optimal power flow (ACOPF) considering the voltage stability constraint under the worst wind scenario and transmission N-1 contingency is developed. The objective of RPP in this work is to minimize the VAR investment and the expected generation cost. Benders decomposition is used to solve this model with an upper level problem for VAR allocation optimization and generation cost minimization as a lower problem. Then, several problems related wind power and demand response uncertainties under power market operation are investigated. These include: an efficient and effective method to calculate the LMP intervals under wind uncertainty is proposed; the load serving entities’ strategic bidding through a coupon-based demand response (CBDR) with which a load serving entity (LSE) may participate in the electricity market as strategic bidders by offering CBDR programs to customers; the impact of financial transmission right (FTR) with CBDR programs is also studied from the perspective of LSEs; and the stragegic scheduling of energy storages owned by LSEs considering the impact of charging and discharging on the bus LMP. In these problems, a bi-level optimization framework is presented with various objective functions representing different problems as the upper level problems and the ISO’s economic dispatch (ED) as the lower level problem. The bi-level model is addressed with mathematic program with equilibrium constraints (MPEC) model and mixed-integer linear programming (MILP), which can be easily solved with the available optimization software tool.
Robust Unit Commitment With High Penetration Levels Of Renewable Energy
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Author : Chiang Huang
language : en
Publisher:
Release Date : 2020
Robust Unit Commitment With High Penetration Levels Of Renewable Energy written by Chiang Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Reduction Of Wind Power Curtailment In Power System Operation
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Author : Xin Li
language : en
Publisher:
Release Date : 2015
Reduction Of Wind Power Curtailment In Power System Operation written by Xin Li 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.
Clean, affordable energy is essential for continued growth of the economy in a country. Almost every country's laws and policies put in place in the last decade encourage energy suppliers to incorporate large amounts of renewable generation (wind and solar). This has changed the traditional mix of "fuels" used for energy generation. Integrating these resources into a reliable and affordable power system will require an unprecedented level of cooperative action within the electric industry, related utilities and the state. Power grid has existing flexibility in the system to cost-effectively integrate wind resources but, as operated today, more can be done. Integration involves managing the variability (the range of expected electricity generation output) and uncertainty (when and how much that generation will change during the day) of energy resources. Wind is one kind of free energy and this "must-take" wind power generation is integrated into the system operation. In this thesis, the impacts on the combined conventional generators, the transmission lines and the operation costs will be examined under different system operation conditions (constrained and unconstrained) with increasing wind power penetration. The firm scheduled bilateral contract from the conventional generation can cause transmission congestion and free wind power cannot be integrated into the power system operation sufficiently. This thesis proposes a combined pool/bilateral trade model to cooperate with wind power output fluctuations to increase the utilisation of wind farm which are currently constrained by the transmission networks. The one-step optimal power flow model dispatches the pool in combination with the curtailed part of fixed bilateral contracts from conventional generators. The aim is integrating maximum wind energy in the power system while minimizing costs. A dynamic wind turbine model is used to identify the impacts of integrating wind power into system operation; the Weibull Distribution Function is used to analyze the problem of wind distribution; and the Monte Carlo Simulation (MCS) method is used to simulate the output of wind power generation. The proposed combined pool/bilateral trade model is applied to the modified IEEE-9 bus system for verification and validation. Following this, the analysis on IEEE-30 bus system is the comparison studies with the proposed one-step combined pool/bilateral trade model under different bidding prices. Two case studies with different market strategies through the proposed method are introduced, with different volume values of the firm bilateral contracts and the different payments for the curtailment bids. The simulation results show the relative level of pool versus bilateral trading and these influences on the performance in terms of individual power generation levels and costs. The well-proven software tools MATLAB and MATPOWER support the study.
Future Power System Dynamic Frequency Response Under High Penetration Levels Of Wind
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Author : Jun Xia
language : en
Publisher:
Release Date : 2014
Future Power System Dynamic Frequency Response Under High Penetration Levels Of Wind written by Jun Xia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Due to environmental concerns, offshore wind plant will play an important role in next decades for meeting the requirement of carbon emission and renewable energy target. The variable speed wind turbine will not have a load-frequency response similar with traditional synchronous generator which may cause the inertia less problems in the system. The UK National Grid has developed scenarios where high wind power penetration levels are considered which are likely to change the patterns of UK transmission network operation and dynamic performance. Therefore, it is necessary to develop an analytical capability which can assess the system dynamic performance ahead of the anticipated changes. Although some work has been reported in this area, the studies are either based on very simple network representations or involve very complex proprietary network modelling not publically available and with results which are often difficult to interpret. This thesis aims to develop appropriate ways of deriving a representative dynamic system model using UK transmission system as a benchmark. The methodology "Individual channel analysis and design (ICAD)" is utilized to realise the trade-off between plant dynamical requirements (feedback design) and the limitations (coupling effects) on achieving such requirements in multivariable system. A representative 21 bus dynamic model of the entire UK transmission system based on Ten Year Statement has been developed and implemented in Power System Simulator (PSS/E). A few recent system-wide events, captured by the existing Phasor Measurement Units (PMU), have been used to validate the frequency response of the model. Moreover, the General Electric (GE) type DFIG models are added for the purpose of analysing the future system performance with the increasing penetration levels of wind energy. The case study reveals that improvements are to be had by transmission line reinforcements under appropriate wind energy distribution scenarios with system transient stability largely improved. The impact of key influencing factors such as the size of the largest generating unit for n-1 contingency, amount of primary system response, frequency dependency of load, and others are presented. The study concludes that none of the individual factors can provide a complete solution and that careful cost benefit analysis is needed to determine the proper mix of services and reinforcements needed in the future.
Advances In Electric Power Systems
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Author : Xu Andy Sun
language : en
Publisher:
Release Date : 2011
Advances In Electric Power Systems written by Xu Andy Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The electricity industry has been experiencing fundamental changes over the past decade. Two of the arguably most significant driving forces are the integration of renewable energy resources into the electric power system and the creation of the deregulated electricity markets. Many new challenges arise. In this thesis, we focus on two important ones: How to reliably operate the power system under high penetration of intermittent and uncertain renewable resources and uncertain demand: and how to design an electricity market that considers both efficiency and fairness. We present some new advances in these directions. In the first part of the thesis, we focus on the first issue in the context of the unit commitment (UC) problem, one of the most critical daily operations of an electric power system. Unit commitment in large scale power systems faces new challenges of increasing uncertainty from both generation and load. We propose an adaptive robust model for the security constrained unit commitment problem in the presence of nodal net load uncertainty. We develop a practical solution methodology based on a combination of Benders decomposition type algorithm and outer approximation techniques. We present an extensive numerical study on the real-world large scale power system operated by the ISO New England (ISO-NE). Computational results demonstrate the advantages of the robust model over the traditional reserve adjustment approach in terms of economic efficiency, operational reliability, and robustness to uncertain distributions. In the second part of the thesis, we are concerned with a geometric characterization of the performance of adaptive robust solutions in a multi-stage stochastic optimization problem. We study the notion of finite adaptability in a general setting of multi-stage stochastic and adaptive optimization. We show a significant role that geometric properties of uncertainty sets, such as symmetry, play in determining the power of robust and finitely adaptable solutions. We show that a class of finitely adaptable solutions is a good approximation for both the multi-stage stochastic as well as the adaptive optimization problem. To the best of our knowledge, these are the first approximation results for multi-stage problems in such generality. Moreover, the results and the proof techniques are quite general and extend to include important constraints such as integrality and linear conic constraints. In the third part of the thesis, we focus on how to design an auction and pricing scheme for the day-ahead electricity market that achieves both economic efficiency and fairness. The work is motivated by two outstanding problems in the current practice - the uplift problem and equitable selection problem. The uplift problem is that the electricity payment determined by the electricity price cannot fully recover the production cost (especially the fixed cost) of some committed generators, and therefore the ISOs make side payments to such generators to make up the loss. The equitable selection problem is how to achieve fairness and integrity of the day-ahead auction in choosing from multiple (near) optimal solutions. We offer a new perspective and propose a family of fairness based auction and pricing schemes that resolve these two problems. We present numerical test result using ISO-NE's day-ahead market data. The proposed auction- pricing schemes produce a frontier plot of efficiency versus fairness, which can be used as a vaulable decision tool for the system operation.
Power Generation Operation And Control
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Author : Allen J. Wood
language : en
Publisher: John Wiley & Sons
Release Date : 2012-11-07
Power Generation Operation And Control written by Allen J. Wood and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-07 with Technology & Engineering categories.
A comprehensive text on the operation and control of power generation and transmission systems In the ten years since Allen J. Wood and Bruce F. Wollenberg presented their comprehensive introduction to the engineering and economic factors involved in operating and controlling power generation systems in electric utilities, the electric power industry has undergone unprecedented change. Deregulation, open access to transmission systems, and the birth of independent power producers have altered the structure of the industry, while technological advances have created a host of new opportunities and challenges. In Power Generation, Operation, and Control, Second Edition, Wood and Wollenberg bring professionals and students alike up to date on the nuts and bolts of the field. Continuing in the tradition of the first edition, they offer a practical, hands-on guide to theoretical developments and to the application of advanced operations research methods to realistic electric power engineering problems. This one-of-a-kind text also addresses the interaction between human and economic factors to prepare readers to make real-world decisions that go beyond the limits of mere technical calculations. The Second Edition features vital new material, including: * A computer disk developed by the authors to help readers solve complicated problems * Examination of Optimal Power Flow (OPF) * Treatment of unit commitment expanded to incorporate the Lagrange relaxation technique * Introduction to the use of bounding techniques and other contingency selection methods * Applications suited to the new, deregulated systems as well as to the traditional, vertically organized utilities company Wood and Wollenberg draw upon nearly 30 years of classroom testing to provide valuable data on operations research, state estimation methods, fuel scheduling techniques, and more. Designed for clarity and ease of use, this invaluable reference prepares industry professionals and students to meet the future challenges of power generation, operation, and control.