Method and system for solving reactive power optimization model containing wind power plant

Abstract

The invention provides a method and a system for solving a reactive power optimization model containing a wind power plant. The method comprises the steps: S1, establishing a wind driven generator model; S2, establishing the reactive power optimization model containing the wind power plant; S3, fixing involved discrete control variables of the reactive power optimization model, utilizing an interior point method to solve a continuous reactive power optimization module and calculate variable out-of-limit times under each scene and obtaining a corresponding optimal continuous control variable under an optimal scene; S4, fixing the involved continuous control variables of the reactive power optimization model, reducing the variable out-of-limit times and system average transmission loss of the reactive power optimization model under each scene and obtaining the optimal discrete control variable; S5, utilizing monte-carlo simulation and load flow calculation to check the optimal continuouscontrol variable and the optimal discrete control variable. The method disclosed by the invention ensures network voltage safety under the uncertain wind power integration condition, so that not onlyis the time-consuming monte-carlo simulation in a stochastic programming method avoided, but also the defect that a robust programming method cannot use wind power probability distribution information is overcome.

Description

technical field [0001] The invention relates to the field of electric power technology, and in particular, to a method and a system for solving a reactive power optimization model of a wind farm. Background technique [0002] As a new type of renewable energy, wind power plays a vital role in environmental protection and solving the energy crisis. However, the uncertainty of wind power will cause fluctuations in grid voltage, posing a threat to the safe operation of the grid. Therefore, it is necessary to establish a reactive power optimization model including wind farms to obtain corresponding voltage control strategies to ensure the safety of grid voltage after wind power is connected. [0003] The reactive power optimization model with wind power is a nonlinear programming problem with uncertain parameters. The conventional solution methods mainly include stochastic programming method and robust optimization method. The stochastic programming method needs to use the Mon...

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Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the present invention provides a method and system for solving reactive power optimization models including wind farms, which ensures the safety of the grid voltage under the condition of uncertain wind power grid connection, and avoids the power consumption in the stochastic programming method. The time-consuming Monte Carlo simulation overcomes the disadvantage that the robust programming method cannot use the information of the probability distribution of wind power

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