Method and system for determining active power of each unit in electric network

Abstract

The invention relates to a method and a system for determining active power of each unit in an electric network. The electric network consists of a thermal power generation unit and a wind power generation unit in networking and is provided with working periods with quantity of T. The method comprises the steps of determining pre-parameters, constrain parameters of each time period and a primary iteration value of each vector, and setting a total number of iteration; gradually increasing iteration times k from 1; determining each active power vector within each period t and each iteration value of the active power speed vector, and enabling each weight to meet the constrain condition considering the randomness of the wind power generation unit; calculating each iteration value of a target function within the T periods according to a target function formula, determining a historical optimum iteration vector of each active power vector on the basis, and determining a global optimum iteration vector phi g; and adopting each weight of the phi g in each period as the working active power of a corresponding unit when k exceeds (K-1). Due to the adoption of the method and the system, the active power of the thermal power generation unit and the wind power generation unit can be reasonably allocated, and the demand of the active power in different periods can be satisfied.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method and system for determining the active power of each unit in the grid. Background technique [0002] The traditional power grid refers to a power network composed solely of thermal power units. The power generation of this power grid system is proportional to the amount of fuel consumed, so it is accompanied by the consumption of a large amount of fossil energy and the generation of pollution. In order to reduce energy consumption and pollution, countries around the world are vigorously developing new energy sources such as solar energy and wind energy. Therefore, the structure of the power grid is gradually shifting from thermal power to a variety of generating units connected to the grid. [0003] The grid-connection of different generating sets has brought about a problem that did not exist in the power grid dominated by thermal power before, that is, how to alloca...

AI Technical Summary

Problems solved by technology

Since the wind in nature is unpredictable, its wind power has great randomness, sometimes strong, sometimes weak, sometimes absent, so the output active power of the wind turbine is unstable, while the output active power of the thermal power is Stable, in this way, in a grid composed of thermal power units and wind turbines connected together, more reserve power must be reserved than in the previous grid to cope with random changes in the output active power of wind turbines, and the active power of wind turbines in the grid The greater the proportion of total active power, the greater the amount of backup power required, which greatly limits the increase in the proportion of wind power in the grid, and also greatly affects the economic and environmental benefits of the grid

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