Showing papers on "Economic dispatch published in 1974"

Optimal Power Dispatch

Abstract: This paper presents an economic dispatch procedure for allocating generation in a power system by the use of the Jacobian matrix. The major advantage of the procedure over other optimal dispatch procedures is its inherent simplicity and rapid convergence behavior which are characteristics particularly omportant for on-line implementation. Results obtained from an investigation of its convergence for the 118 bus IEEE system are given. Comparisons with the classical approach are conducted and logic for on-line implementation is presented.

Some applications of optimization techniques to power systems problems

Abstract: Important power system planning and operation problems have been formulated as mathematical optimization problems. Such problems as the economic dispatch, in many of its facets; var scheduling and allocation; pollution dispatch; maximum interchange; hydrothermal unit commitment and dispatch; generation, transmission, and distribution expansion planning; maintenance scheduling and substation switching, have been formulated and solved. Modern mathematical optimization techniques, such as nonlinear, quadratic, linear, integer and dynamic programming and their many combinations and extensions, have been exploited. Some of the formulations and solutions to these problems as presented in the recent literature within the power systems field are reviewed. The large number of papers available is a measure of the current immense activity in this area. Attempts are made to point out some specific areas where more work needs to be done.

A Real Time Optimizer for Security Dispatch

Abstract: As power systems have evolved in size and complexity so has the need for sophisticated and comprehensive real time control and dispatch techniques. Solutions presented in this paper are intended for on-line applications and are further designed to accommodate "network" as well as "nonnetwork" (e.g., environmental) and interacting operating restrictions. The paper reviews the criteria for the constrained optimization of real power; discusses practical approaches towards implementation; presents numerical results of tests on a large network model including the effects of convergence, external equivalents, and reference bus locations; proposes extensions to include reactive power dispatch and contingency constraints

Economic Power Dispatch with Line Security Limits

Abstract: A practical and efficient method is presented for the economic dispatch of generation with explicit recognition of line security limits. The linearized or dc loadflow approximation is used to formulate the line security limits as linear inequality constraints on the generator outputs. The optimization problem is solved by the method of gradient projection. The proposed method does not require a great deal more computation time or system-state information than the established method of dispatch which is unable to recognize line security limits. In consequence, the method gives power control centers with only moderate sized dispatch computers the potential for recognizing line security limits in their economic dispatch and thus obtaining improved security and economy in system operation.

Economic dispatch technique for interconnected power systems

Abstract: A control system for computing economic dispatch signals for each operating area within an interconnected power system, utilizing an algorithm for solving the interarea coordination equations resulting in the definition of a common reference running cost for the interconnection, and enabling the explicit solving of the individual operating area running costs, thus avoiding any need for an iterative solution. The computational burden is shared between a system computer which makes periodic power and/or running cost assignments for each operating area, and operating area computers which independently calculate specific dispatch signals for the generators within their areas.

Determining optimal fuel mix for environmental dispatch

Abstract: This paper develops a method for obtaining the optimal mix of high and low sulfur fuels for users such as electric utilities and large industrial complexes. The mix is determined so that environmental limits are met and plant operating schedules are fully maintained. The problem is formulated in a "minimum energy with penalty function" format and well known optimal control theory methods are applied to obtain the solution. An adaption of this or similar procedures may be necessary in the future because of the scarcity of low sulfur fuels and under appropriate meteorological conditions a fuel cost savings of approximately $20 000 per day for 1000 MWe coal-fired generation plant may be obtained. The methods developed here may be used with present electric utility economic dispatch programs to integrate local meteorology and environmental limits with plant economics. An example application demonstrates the methods.

Computers: Controlling and optimizing power systems: Economic dispatch, stability, security, and reliable system operation are principal tasks for the computer

Abstract: Discusses computer control of power systems to provide economic dispatch stability, security, and reliable system operation.