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Method for determining local minimal solution and searching global minimal solution of power grid economic dispatching

A global minimum solution and economic dispatching technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the inability to guarantee the economic dispatch of the power grid, so as to improve the economy and efficiency of power generation, reduce the scope, The effect of improving search efficiency

Active Publication Date: 2014-01-29
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the above-mentioned prior art cannot guarantee convergence to the global minimum solution of the power grid economic scheduling problem considering the valve point effect of generator sets, and to provide a local minimum solution determination and global minimum solution search method for power grid economic scheduling

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  • Method for determining local minimal solution and searching global minimal solution of power grid economic dispatching
  • Method for determining local minimal solution and searching global minimal solution of power grid economic dispatching
  • Method for determining local minimal solution and searching global minimal solution of power grid economic dispatching

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Embodiment 1

[0036] The local minimum solution determination and global minimum solution search method for power grid economic dispatching of the present invention, such as figure 1 shown, proceed as follows:

[0037] Step (1), obtain the output upper and lower limit data of each unit in the power system with N generator sets Coefficient data a of output-fuel cost function g ,b g ,c g ,e g , f g and system load data P d .

[0038] Step (2), establishing a mathematical optimization model of the power grid economic dispatching problem considering the unit valve point effect.

[0039] In the traditional economic dispatching problem, the unit output-fuel cost curve is approximated as a smooth quadratic polynomial. It should be noted that the output-fuel cost curve of the unit is obtained by multiplying the inherent output-fuel consumption curve of the unit by the fuel cost coefficient. However, the wire-drawing effect when the intake valve of the turbine is suddenly opened will cause...

Embodiment 2

[0134] Taking a standard test system of 3 units and 13 units as an example, the total load of the 3-unit system is 850MW, and the total load of the 13-unit system is 1800MW. Table 2 and Table 3 list the global minimum solution obtained by the traversal search method adopted by the present invention and the best results in the published literature. Compared with the published best results, the traversal search method adopted in the present invention can obtain the same or smaller solution, which shows that the traversal search method adopted in the present invention can indeed obtain the global minimum solution, and also verifies the power grid economy in the present invention. Rationality, effectiveness and superiority of scheduling local minimum solution determination and global minimum solution search methods.

[0135] Table 2 The minimum solution of the 3-unit standard test system obtained by different algorithms

[0136]

[0137] Table 3 The minimum solution of the sta...

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Abstract

The invention discloses a method for determining a local minimal solution and searching a global minimal solution of power grid economic dispatching. The method includes the steps of firstly, acquiring related data of each generator set of a power system containing N generator sets; secondly, building a mathematic optimizing model of the power economic dispatching problem; thirdly, obtaining a singular point, formed by a valve point and the output upper limit, of each generator set; fourthly, allowing the output, in the feasible solutions, of at most one generator set is not at the singular point; fifthly, allowing the outputs, in the feasible solutions, of at least two generator sets are not at the singular point, allowing the fuel cost function to the output first derivative of the generator sets to be equal, and traversing and searching the feasible solutions satisfying the fourth step and the fifth step; sixthly, taking feasible solution, obtained in the fourth and fifth steps, with the minimal fuel cost as the global minimal solution to the problem. The method has the advantages that the necessary condition of the spatial local minimal solution to the problem is provided, and the solutions satisfying the condition are traversed and searched to obtain the global minimal solution to the problem.

Description

technical field [0001] The invention relates to the technical field of operation, analysis and dispatching of electric power systems, in particular to a method for determining a local minimum solution and a global minimum solution for power grid economic dispatching. Background technique [0002] Considering the valve point effect of generating units, the grid economic dispatching problem is a non-convex, non-differentiable and multi-local minimum solution optimization problem, which cannot be solved by traditional gradient methods and Newton methods. In order to better solve this problem , scholars proposed an evolutionary programming algorithm (Q.H.Wu, and J.T.Ma. Power system optimal reactive power dispatch using evolutionary programming [J]. IEEE Transactions on Power Systems, 1995, 10(3): 1243-1249. Wu Qinghua, J.T.Ma .Optimal Reactive Economic Dispatch of Power System Using Evolutionary Programming [J]. IEEE Transactions on Power Systems, 1995, 10(3): 1243-1249.), Gene...

Claims

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Application Information

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IPC IPC(8): G06Q50/06G06F17/30
CPCY02D10/00
Inventor 吴青华詹俊鹏
Owner SOUTH CHINA UNIV OF TECH
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