Reservoir operation graph optimization method based on dynamic planning

Abstract

The invention discloses a reservoir operation chart optimization method based on dynamic planning. The method comprises the following steps that: dividing a whole operation period into T time periods; separating an operation line, and dispersing the operation line in a feasible water level range of each time period to obtain water level discrete points; establishing all water level discrete point combined spaces Ct<k> of the operation line, and determining a reservoir operation chart recursive computation model based on the dynamic planning; from the Tth time period, beginning to carrying out inverse time sequence recursive computation; enabling t to be equal to t-1, entering computation of a next time period, and when the computation of a (t-1)th time period is finished, ending an inverse time sequence recursive computation process; and from the first time period, carrying out recursion to the last time period in the time sequence, and determining an optimal discrete water level combination (Ct) to obtain an optimal reservoir operation chart. By use of the method, a reservoir operation chart drawing model is coupled with a dynamic planning model, an inverse time sequence recursive way is adopted to calculate the optimal reservoir operation chart, and the global convergence of the dynamic planning is fully utilized for guaranteeing the global optimality of the obtained operation chart.

Description

technical field [0001] The invention belongs to the field of optimal operation of hydropower energy and optimal scheduling of electric power system power generation, and more specifically relates to a method for optimizing a reservoir scheduling diagram based on dynamic programming. Background technique [0002] The reservoir dispatching diagram is a graphical representation of reservoir dispatching rules, mainly composed of several dispatching lines and corresponding dispatching areas. At present, there are mainly two methods for drawing reservoir operation diagrams. One is the traditional method, which is to calculate and deduce the operation diagrams by selecting typical hydrological annual runoff series and recursively calculating the operation diagrams. The reservoir operation diagrams obtained by this method can ensure that the reservoir The normal operation of the model is not damaged, and has good physical background significance and high reliability, but it also has...

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Problems solved by technology

At present, there are mainly two methods for drawing reservoir operation diagrams. One is the traditional method, which is to calculate and deduce the operation diagrams by selecting typical hydrological annual runoff series and recursively calculating the operation diagrams. The reservoir operation diagrams obtained by this method can ensure that the reservoir The normal operation of the model is not damaged, and has good physical background significance and high reliability, but it also has some shortcomings: first, the selection of typical years has a great influence on the results; second, it needs to be carried out during the drawing process Repeated manual correction, randomness and experience

It is relatively simple and convenient to obtain the reservoir scheduling diagram through the optimization method, but there are also some shortcomings: on the one hand, the optimization algorithm needs an initial solution, and the quality of the initial solution has a great impact on the final result. The initial line is simulated and optimized and the optimal scheduling graph cannot be directly calculated; on the other hand, although many evolutionary algorithms have been proven to have global convergence, they are usually not guaranteed to obtain The global optimal solution, so the optimality of the scheduling graph obtained by the optimization method is difficult to guarantee

[0006] (2) This method calculates the hydropower of each power station according to the hydraulic sequence from top to bottom according to the initial dispatching diagram, so as to optimize and adjust each dispatching line of the cascade power station dispatching diagram, and the final optimization result is less dependent on the initial solution. large, and it is calculated according to the hydraulic sequence from top to bottom, only the upper reservoir can affect the lower reservoir, so the optimization algorithm used cannot consider the overall optimality of the cascade system as a whole

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