Impact of distributed generation and interruptible load on energy supply strategies of distribution companies in day-ahead market
ABSTRACT This paper introduces an energy supply model for a distribution company (Disco) in day-ahead electricity market. The model consists of two nested blocks, wherein, outer block maximizes Discos profits, while inner block simulates the independent system operator's (ISO's) market clearing problem and minimizes generation costs and compensation costs for interrupting load. In this model, Discos have distributed generation (DG) and Interruptible load (IL) resources and the model takes into account the Impact of other Discos' energy supply strategy. In order to consider the effect of DG and IL on Discos' energy supply strategies, the proposed model applied to an eight-bus system.
Conference Proceeding: Management of interruptible loads for power system security and operation[show abstract] [hide abstract]
ABSTRACT: The paper critically analyzes the state of the art of the procedures to ensure the security of power system operation with respect to the introduction of interruptible loads. A short overview of the existing international approaches is presented. The potentiality of load curtailment as an ancillary service is underlined. The benefits for the power system in terms of increased exploitation of the network capability-with particular attention to the increase of total transfer capacity (TTC) across network sections-are emphasized. A new definition of security is discussed as a consequence of the use of interruptible loads not only into emergency conditions but also during normal and alert operation. Some preliminary hints for the specific situation of the Italian Power System are presented. The results of a research activity on the possible use of the load curtailment approach to increase the TTC in the Italy-Europe sections are reported.Power Engineering Society Summer Meeting, 2002 IEEE; 08/2002
Conference Proceeding: Competitive framework for procurement of interruptible load services[show abstract] [hide abstract]
ABSTRACT: This paper deals with optimal procurement of interruptible load services within secondary reserve ancillary service markets in deregulated power systems. The proposed model is based on an optimal power flow framework and can aid the independent system operator (ISO) in real-time selection of interruptible load offers. The structure of the market is also proposed for implementation. Various issues associated with procurement of interruptible load such as advance notification, locational aspect of load, power factor of the loads, are explicitly considered. It is shown that interruptible load market can help the ISO maintain operating reserves during peak load periods. Econometric analysis reveals that a close relationship exits between the reserve level and amount of interruptible load service invoked. It was also found that at certain buses, market power exists with the loads, and that could lead to unwanted inefficiencies in the market. Investing in generation capacity at such buses can mitigate this. The CIGRE 32-bus system appropriately modified to include various customer characteristics is used for the study.Power Engineering Society General Meeting, 2003, IEEE; 08/2003
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ABSTRACT: In times of stress customers can help a utility by means of voluntary demand management programs if they are offered the right incentives. The incentives offered can be optimized if the utility can estimate the outage or substitution costs of its customers. This paper illustrates how existing utility data can be used to predict customer demand management behavior. More specifically, it shows how estimated customer cost functions can be calibrated to help in designing efficient demand management contracts.IEEE Power Engineering Review 05/2001; 21(4):71-71.