Modeling method for unit combination problem of power system

Abstract

The invention relates to a modeling method for a unit combination problem of a power system. The method comprises the steps of determining thresholds for classifying units according to capacities; classifying the units according to the thresholds; respectively determining the number of unit types for optimization and the unit number of each type; establishing a unit combination mathematic model; and determining the number of the starting units of each type, the total output of the units, and the start and stop schedule and the output schedule of the units. According to the method, the conventional units of the power system are classified according to the installed capacities, and the unit combination mathematic model is established by using the number of the conventional units of each type as an optimization variable. Compared with the traditional method of establishing the mathematic model by using the start and stop states of the individual unit as optimization variables, the method can greatly reduce the number of the variables of the mathematic model, and is effectively improved in the speed of solving the unit combination problem of the power system.

Description

Technical field: [0001] The invention relates to a modeling method for unit combination problems in electric power systems, in particular to a modeling method for improving the solution speed of unit combination problems in power systems. Background technique: [0002] The study of power system, the study of unit combination has always been its hot and difficult points, and the solution of unit combination is essentially to establish the optimization objective and the constraints that need to be considered, establish the corresponding mathematical model, and then solve the mathematical optimization problem to obtain the optimal power system operation. The unit start-up and shutdown plan and unit output plan that improve the system operation efficiency and reduce the system operation cost. [0003] The unit combination is a complex mixed integer programming problem. The optimization variables include both integer variables and 0-1 state variables. When the number of units par...

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Problems solved by technology

[0003] The unit combination is a complex mixed integer programming problem. The optimization variables include both integer variables and 0-1 state variables. When the number of units participating in the optimization in the system is large, the number of variables will be huge, and the existing mathematical solution methods are difficult to solve such problems. To solve the problem accurately and quickly, it usually takes several hours or even the optimal solution cannot be obtained

[0004] The traditional mathematical modeling method for the unit combination problem is to set the unit state variable, start-up action variable, and shutdown action variable for each unit participating in the optimization. There are many optimization variables and complex logical relationships, which makes it difficult to solve the unit combination problem.

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