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ABSTRACT: A Monte Carlo simulation technique evaluates the reliability indices of restructured power systems with a hybrid market. A model for optimal transaction curtailment for a contingency state in a hybrid market is developed to incorporate the changes brought about by deregulation. The objective of the contingency optimal transaction curtailment for each individual generation company is to minimise its revenue loss. The problem is formulated as a linear programming problem and solved using an optimisation technique. Customer load curtailment, which is the basic parameter for reliability evaluation, is determined using a load-shedding philosophy which is based on the results of the optimal transaction curtailment by the genco. Supply and demand transactions of the market participants are represented by a transaction matrix. The impact of the firm and nonfirm bilateral and reserve contracts on customer reliabilities have been studied. The technique has been illustrated by application to the IEEE Reliability Test System.
IET Generation Transmission & Distribution 02/2007; · 1.20 Impact Factor
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ABSTRACT: In a deregulated power system, spinning-reserve (SR) can be allocated to different ancillary service providers at different locations based on supplier bids and customer choices in terms of reliability and the related cost. The paper investigates the impacts of spinning-reserve allocations on system reliability and cost. A hybrid SR allocation method, which is based on cost-based SR allocation and risk based SR allocation, is proposed to determine the optimal SR locations. Implementation of these techniques in SR markets to determine the optimal SR schedules is presented. The IEEE Reliability Test System has been used to illustrate the proposed methods.
IEE Proceedings - Generation Transmission and Distribution 08/2005; · 0.48 Impact Factor
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ABSTRACT: Power system restructuring has changed the mechanism of system reliability management and electricity pricing. The electricity price and supply point reliability are correlated due to customer participation in market trading in the new environment. A new technique used to determine both nodal prices and nodal reliability indices of deregulated power systems has been developed based on a probabilistic reliability evaluation approach and optimal power flow method. Customer demand response to price changes in terms of customer interruption cost has been included in the technique to re-dispatch generation and to shed load for releasing network violations caused by contingency states. Instead of using nodal price for the normal operation state, the expected nodal price and the associated standard deviation are used to represent the volatility of nodal price due to random failures. A reliability test system (RBTS) has been analysed to illustrate the technique.
IEE Proceedings - Generation Transmission and Distribution 06/2005; · 0.48 Impact Factor
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ABSTRACT: In a bilateral contracts market while selecting contracts to meet their reliability requirements, probability distributions of load point reliability indices considering multi-bilateral contracts with Gencos can provide useful information for the customers. This paper utilizes the modeling of each bilateral contract as an ETMG (equivalent time varying multi-state generation) to evaluate the load point reliability. The priority order in which the generating companies serve various contracts in case of generator outages is considered in modeling the ETMG. A procedure to determine the probability distributions of reliability indices based on the ETMG at various customer load points is proposed. A test system has been analyzed to illustrate the procedure and also the factors that affect the load point reliability.
Power System Technology, 2004. PowerCon 2004. 2004 International Conference on; 12/2004
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ABSTRACT: This paper presents a time sequential Monte Carlo simulation technique to evaluate customer load point reliability in multi-bilateral contracts market. The effects of bilateral transactions, reserve agreements, and the priority commitments of generating companies on customer load point reliability have been investigated. A generating company with bilateral contracts is modelled as an equivalent time varying multi-state generation (ETMG). A procedure to determine load point reliability based on ETMG has been developed. The developed procedure is applied to a reliability test system to illustrate the technique. Representing each bilateral contract by an ETMG provides flexibility in determining the reliability at various customer load points.
IEE Proceedings - Generation Transmission and Distribution 12/2004; · 0.48 Impact Factor
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ABSTRACT: In a deregulated power system, spinning reserve can be allocated to different ancillary service providers at different locations based on the supplier bids and customer choices on the reliability levels required. Different allocations of spinning reserve are expected to create different impacts on the reliability of the physical power system. When transmission failures occur in a physical power system, the system constraints may be violated and spinning reserve may not be immediately committed to the system to serve the customers. This paper investigates the impact of transmission system failures on spinning reserve allocation. A technique is proposed to determine the locations of spinning reserve based on the minimum unit commitment risk.
Electric Utility Deregulation, Restructuring and Power Technologies, 2004. (DRPT 2004). Proceedings of the 2004 IEEE International Conference on; 05/2004
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ABSTRACT: Power system deregulation has introduced some fundamental problems regarding system reliability management. This paper presents a technique used for the reliability evaluation of restructured power systems. A reliability model for each market player in a restructured power system is introduced in which a generation company is represented by an equivalent multistate generation provider and the transmission system is represented by an equivalent multistate transmission provider using reliability network equivalent techniques. Demand-side reliability is considered in the analysis. The concept of nonuniform reliability is presented and customer choices regarding reliability can easily be implemented using the new technique. A test deregulated power system is used to illustrate the application of the technique.
IEE Proceedings - Generation Transmission and Distribution 10/2003; · 0.48 Impact Factor
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ABSTRACT: In a deregulated power system customers have the freedom to choose their reliability. They can purchase spinning reserve directly from electric power providers. In this case, an individual customer is concerned more with its own load point reliability rather than with the system reliability. This paper introduces bulk load point (BLP) well-being indices for supply customers, with the primary objective of determining their spinning reserve based on desired reliability levels in a bilateral market model. The system well-being model used in conventional power systems is extended to the load point model in a restructured power system. The impacts of spinning reserve purchase on these indices were investigated and are reported in the paper. A reliability test system is used to illustrate how customers can determine their spinning reserve in the deregulated environment.
Electric Power Systems Research.
