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Distribution system planning is undergoing a change in paradigm in the context of deregulation and with penetration of distributed generation (DG) sources into distribution networks. This study presents a new heuristic approach based on a back‐propagation algorithm combined with cost–benefit analysis to comprehensive multi‐year distribution system planning. The planning problem incorporates various energy supply options for local distribution companies such as DG sources, substations and feeders and determines the optimum capacities, locations and upgrade plans. Test results comprising a 32 bus system and the IEEE 69 bus system are presented to illustrate the performance of the proposed method. The results are compared with an optimisation solution, and it is demonstrated that the heuristic approach can achieve better performance and has higher computational efficiency. [ABSTRACT FROM AUTHOR]

A generic operations framework for a distribution company (disco) operating in a competitive electricity market environment is presented in this paper. The operations framework is a two-stage hierarchical model in which the first deals with disco's activities in the day-ahead stage, the Day Ahead Operations Model (DAOM). The second deals with disco's activities in real-time and is termed Real-Time Operations Model (RTOM). The DAOM determines the disco's operational decisions on grid purchase, scheduling of distributed generation (DG) units owned by it, and contracting for interruptible load. These decisions are imposed as boundary constraints in the RTOM and the disco seeks to minimize its short-term costs keeping in mind its day-ahead decisions. A case-study is presented considering the well-known 33-bus distribution system and three different scenarios are constructed to analyze the disco's actions and decision-making in this context. [ABSTRACT FROM AUTHOR]

This paper presents a new approach to security coordinated maintenance scheduling in deregulation wherein the independent system operator (ISO) does not generate a maintenance schedule by itself, but calls for maintenance scheduling plans from individual gencos. The maintenance scheduling plans, when incorporated in a medium-term security constrained production scheduling program, can result in unserved energy at one or more buses. Based on the information on bus-wise unserved energy, the ISO generates corrective signals for the genco(s), and directs them to alter their maintenance plans in specific periods and resubmit. The proposed scheme exploits the concept of commons and domains to derive a novel factor to allocate the unserved energy at a bus to a set of generators responsible. Iterations between the gencos and ISO continue until the coordination program has converged, and there is no unserved energy at any period in the system. A case-study for a large-scale power system, which is a representative reduction of the Ontario power system, is presented in the paper with insight on the coordination process. The proposed scheme is computationally simple, efficient, and can be applied to real-sized power systems. [ABSTRACT FROM AUTHOR]

Presents information on a study which examined the problem of reactive power procurement by an independent system operator in deregulated electricity markets. Methodology of the study; Results and discussions.

Competitive electricity markets have been operating in various countries for more than a decade, with every single electricity market presenting its own unique characteristics and features. This paper provides a comprehensive overview of the operational aspects of the Ontario electricity market, its unique features, and its outcomes for the first four years of operation. Several programs implemented in the Ontario market to improve efficiency, transparency, and competitiveness are analyzed, and the effectiveness of these programs are discussed. [ABSTRACT FROM AUTHOR]

In this paper, we present the design ofa localized competitive market for reactive power ancillary services at the level of individual voltage-control areas. The concept of electrical distance has been used to identify the different voltage-control areas within a power system. The proposed reactive power market is settled on uniform price auction, using a modified optimal power-flow model. Uniform prices for various components of reactive power service are obtained for each voltage-control area. In the study cases described in the paper, we examine whether such a localized reactive power market is more desirable than a common system-wide reactive power market. [ABSTRACT FROM AUTHOR]