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Unified solution of a non-convex SCUC problem using combination of modified Branch-and-Bound method with Quadratic Programming

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ENERGY CONVERSION AND MANAGEMENT 2011年第12期52卷 3425-3432页

作者： Shafie-khah, M. Moghaddam, M. Parsa Sheikh-El-Eslami, M. K. Tarbiat Modares Univ Dept Elect & Comp Engn Tehran Iran

In this paper, a new practical method is presented for solving the non-convex security constraint unit commitment (SCUC) problem in power systems. The accuracy of the proposed method is desirable while the shorter computation time makes it useful for SCUC solution of large-scale power systems, real-time market operation and long-term SCUC problems. The proposed framework allows inclusion of the valve point effects, warmth-dependent start-up costs, ramp rates, minimum up/down time constraints, multiple fuels costs, emission costs, prohibited operating zones and AC power flow limits in normal and contingency conditions. To solve the non-convex problem, combination of a modified Branch-and-Bound method with the Quadratic Programming is used as an optimization tool and a developed AC power flow algorithm is applied for considering the security and contingency concerns using the nonlinear/linear AC model. These modifications improve the convergence speed and solution precision of SCUC problem. In the proposed method, in contrast with traditional SCUC algorithms, unit commitment solution, checking and satisfying the security constraints are managed simultaneously. The obtained results are compared with other reported methods for investigating the effectiveness of the proposed method. Also, the proposed method is applied to an Iranian power system including 493 thermal units. (C) 2011 Elsevier Ltd. All rights reserved.

关键词： Branch-and-Bound method Quadratic programming security constraint unit commitment Non-convexity Contingency analysis Nonlinear/linear AC power flow

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Probabilistic Assessment of Available Transfer Capacity via Market Linearization

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IEEE SYSTEMS JOURNAL 2015年第4期9卷 1409-1418页

作者： Mohseni, Moaiad Nouri, Alireza Bandaghiri, P. Salmanpor Saeedavi, R. Afkousi-Paqaleh, Mohammad Islamic Azad Univ Shadeghan Iran Sharif Univ Technol Dept Elect Engn Tehran Iran Amirkabir Univ Technol Dept Elect Engn Tehran Iran Sharif Univ Technol Tehran *** Iran

Uncertainties associated with bus loading and components' availability lead to uncertainties in different system variables based on the system physical and economical relationships. Line flows, bus voltages, different prices, and other variables and indices, such as available transfer capacity (ATC), are stochastic and cannot be expressed as a determined quantity. Traditionally, in order to model the stochastic nature of power systems, a stochastic power flow algorithm is used. In this paper, stochastic-algebraic method is applied to find the probability density function (pdf) of ATC. The algorithm linearizes the optimal power flow formulation and uses Gram-Charlier expansion to find the pdf of the ATC, based on the statistical moments. The main contribution of this paper is that the market clearing equations are linearized instead of the power flow equations. In addition, in most of previous studies, the effects of system uncertainties have been neglected in ATC calculations. The other advantage of the proposed method is that the program execution time is very short. The proposed method is tested on the IEEE Reliability Test System, and the results are compared with those drawn using Monte Carlo simulation to show the effectiveness of the proposed method.

关键词： Available transfer capacity (ATC) security constraint optimal power flow (OPF) security constraint unit commitment stochastic analysis

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The Issue of unit constraints and the Non-Confiscatory Electricity Market 17

The Issue of Unit Constraints and the Non-Confiscatory Elect...

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17th IEEE International Conference on Environment and Electrical Engineering (IEEE EEEIC) / 1st IEEE Industrial and Commercial Power Systems Europe Conference (IEEE I and CPS Europe)

作者： Bashi, Mazaher Haji Rahmati, Iman Bak, Claus Leth Pillai, Jayakrishnan Radhakrishna Isfahan Univ Technol Dept Elect & Comp Engn Esfahan Iran Iran Grid Management Co IGMC Market Monitoring Grp Elect Market Tehran Iran Aalborg Univ Energy Technol Dept Aalborg Denmark

ISBN: (纸本)9781538639177

security constraint unit commitment is devised to drive the generation unit schedule in a deregulated environment. Generation bids, transmission system constraints and generation unit constraints are thoroughly considered in this optimization problem. It is acceptable that the transmission system normal condition constraints may affect the economic opportunities of the generation companies in the electricity market. Transmission system limitations are the inherent limits of the market environment but this is not true for the generation unit constraints. It means that the generation unit constraint of a certain player should not affect the economic opportunities of the rivals. If this happen, generation units can claim to the electricity market regulatory board. In this paper the effect of generation unit constraint on the market outcome is discussed. A fair mechanism is introduced in which the generation unit constraints of a certain player cannot limit the economic opportunities of the rivals in the electricity market. Finally, the result of implementing the proposed mechanism in Iran Electricity Market (IEM) has been reported.

关键词： security constraint unit commitment fair electricity market generation unit constraints

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Operational Strategy of Energy Storage to Address Day-Ahead Scheduling Errors in High RE Scenario 8

Operational Strategy of Energy Storage to Address Day-Ahead ...

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8th IEEE India International Conference on Power Electronics (IICPE)

作者： Sumanth, Yamujala Jain, Anjali Das, Partha Bhakar, Rohit Mathur, Jyotirmay Kushwaha, Priyanka Malaviya Natl Inst Technol Jaipur Ctr Energy & Environm Jaipur Rajasthan India Malaviya Natl Inst Technol Jaipur Dept Elect Engn Jaipur Rajasthan India

ISBN: (纸本)9781538649961

High penetration of intermittent renewable generation may impose supply-demand mismatch in real time operation due to day-ahead forecast errors. This results in increase of cycling from conventional generating unit fleet there by cost of generation increases. To address the issue, this paper presents a MILP based 2-step security constrained scheduling problem considering Day-ahead hourly scheduling and intra hour re-dispatch. Further, benefits of using Energy Storage Systems for balancing and reserve services are evaluated. Effectiveness of proposed model is studied on LEEE-118 test system.

关键词： Energy storage systems renewable integration scheduling security constraint unit commitment

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Demand Response Planning in Day-Ahead Market for Improving Power System Flexibility with High Wind Penetration levels

Demand Response Planning in Day-Ahead Market for Improving P...

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North American Power Symposium (NAPS)

作者： Radaideh, Ashraf Ajarapu, Venkataramana Iowa State Univ Dept Elect & Comp Engn Ames IA 50011 USA

ISBN: (纸本)9781467373890

Increasing penetration levels of wind energy have brought new and challenging problems to power system operation and control, often manifested as a dramatic increase in the magnitude and speed of system ramping requirements. Wind energy will also be more susceptible for curtailments during night and early morning hours to avoid situations of excess generation levels. Demand Response (DR) participation is an important and attractive solution expected to mitigate the consequences of integrating future wind energy. In this context, this paper highlights the significance of integrating DR programs in the day-ahead markets and proposes new modified schemes suitable for mitigating the consequences of integration wind energy. DR programs under investigation includes;Load Shifting Program (LSP), Demand Bidding Program (DBP), and Dynamic Pricing Programs (DPPs). The security Constrained unit commitment (SCUC) problem is used to represent the day-ahead wholesale market and to determine optimal energy dispatch of thermal generation units and available DR resources. The effects of DR participants are demonstrated using the IEEE -Reliability Tests System (RTS) scheduled over 24-hour period. The results show that ef1'ective participation of DR programs in wholesale markets will provide valuable resources for mitigating the difficulties of integrating current and future wind power generations.

关键词： Demand response wind integration electricity market load shifting security constraint unit commitment mixed integer linear programming

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The Effect of Windfarms Location on Value of Wind by Considering security

The Effect of Windfarms Location on Value of Wind by Conside...

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General Meeting of the IEEE-Power-and-Energy-Society

作者： Hamidi, V. Li, F. Yao, L. Univ Bath Ctr Sustainable Energy Bath BA2 7AY Avon England Renewables & T&D Emerging Technol AREVA T&D Technol Ctr Stafford ST17 4LX England

ISBN: (纸本)9781424419050

The value of intermittent wind generation is significantly affected by their penetration and concentration, and is further affected by their location within a network. This is because the location and penetration level of wind generation will result in significant impact on power flow distribution across the network. When increasing the penetration and concentration of wind generation in a power system, system security may also be impacted. The degree of change on system security is again affected by wind farm location, which in turn will affect the value of wind. In this paper, the benchmark power system operational cost and emission cost, without any wind penetration, is evaluated first, considering all network and generation constraints. By increasing the wind penetration and moving wind farm locations around the network, the value of wind at differing locations is quantified via the comparison with the benchmark operational and emission costs. The quantification was evaluated on the IEEE 30 busbar system through security constraint unit commitment (SCUC) and results indicate that the value of wind is significantly affected by its location and penetration level in a system.

关键词： Value of Wind security constraint unit commitment Wind Penetration Renewable Energy Capacity Credit

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The Effect of Windfarms Location on Value of Wind by Considering security

The Effect of Windfarms Location on Value of Wind by Conside...

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IEEE Power and Energy Society General Meeting

作者： V. Hamidi F. Li L. Yao Centre for Sustainable Energy University of Bath Bath UK BA2 7AY

ISBN: (纸本)9781424419050

关键词： Value of Wind security constraint unit commitment Wind Penetration Renewable Energy Capacity Credit wind penetration Wind Wind energy generation Renewable energy Osmosis

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Operational Strategy of Energy Storage to Address Day-Ahead Scheduling Errors in High RE Scenario

Operational Strategy of Energy Storage to Address Day-Ahead ...

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IEEE India International Conference on Power Electronics

作者： Yamujala Sumanth Anjali Jain Partha Das Rohit Bhakar Jyotirmay Mathur Priyanka Kushwaha Centre for Energy and Environment Malaviya National Institute of Technology Jaipur Jaipur India Department of Electrical Engineering Malaviya National Institute of Technology Jaipur Jaipur India

ISBN: (纸本)9781538649978;9781538649961

High penetration of intermittent renewable generation may impose supply-demand mismatch in real time operation due to day-ahead forecast errors. This results in increase of cycling from conventional generating unit fleet there by cost of generation increases. To address the issue, this paper presents a MILP based 2- step security constrained scheduling problem considering Day-ahead hourly scheduling and intra hour re-dispatch. Further, benefits of using Energy Storage Systems for balancing and reserve services are evaluated. Effectiveness of proposed model is studied on IEEE-118 test system.

关键词： Energy storage systems Renewable integration Scheduling security constraint unit commitment

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