Standby decision-making method for fully considering reliability and economical efficiency of electric system

Abstract

The invention discloses a standby decision-making method for fully considering the reliability and the economical efficiency of an electric system. The method comprises the steps that a most basic unit commitment is operated, and a capacity loss probability table (COPT) is set up based on the unit commitment result; the EENS is expressed as a piecewise linearization expression of an SSR based on the capacity loss probability table (COPT); a spinning reserving optimization model carrying an EENS analytical expression is operated, and a capacity loss probability table (COPT) is set up again through the operation result; whether convergence conditions are met or not is judged, if convergence is achieved, operation quits, otherwise, the step of expressing the EENS as the piecewise linearization expression of the SSR based on the COPT is executed again till the convergence conditions are met. The EENS is analyzed into a piecewise linear function only relevant to the SSR, the complexity of the EENS is greatly reduced, and the EENS can be solved easily. Spinning reservation can be automatically optimized between the reliability and the economical efficiency, and calculating efficiency is effectively improved.

Description

technical field [0001] The invention relates to the field of power system optimization, in particular to a backup decision-making method that takes the reliability and economy of the power system into consideration. Background technique [0002] Reserve, especially spinning reserve (Spinning Reserve, SR) is an important resource to deal with the loss of load caused by unit failure, network failure or sudden increase of load in the power system. Planning sufficient spinning reserves can reduce the possibility of load loss, but providing spinning reserves will generate certain expenses and increase operating costs. Spinning reserve requires scientific and reasonable planning, which must not only satisfy certain reliability but also optimize economic efficiency. [0003] The traditional method is a deterministic method, which determines the spinning reserve according to the proportion of the total load or the largest online unit, or a combination of them. Considering the stoc...

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Problems solved by technology

The expression of reliability index is highly nonlinear and combinatorial. Together with the unit combination problem, the calculation dimension and search space are very large, and it is difficult for a computer to solve it.

At present, domestic and foreign methods of optimizing the probability of spinning reserve mainly consider only a few important events to reduce the number of sudden failures to reduce the calculation burden, but it cannot guarantee that the operating uncertainty of the entire process is captured, and this method will lead to a decrease in calculation accuracy. The result is not optimal

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