Double-fed wind farm reactive output optimization method in system recovery process

Abstract

The invention discloses a double-fed wind farm reactive output optimization method in a system recovery process. The method is characterized in that reactive optimization of a recovered system is performed by employing a reactive adjusting capability of a double-fed wind turbine. The method includes following steps: step 1, performing analysis and deduction on a mathematical model of a double-fedwind farm to obtain a P-Q curve thereof and a quantitative relation between an active output and a reactive output thereof; step 2, establishing a double-fed wind farm reactive output optimization model which regards minimum system loss and node voltage deviation as the target by regarding the reactive adjusting range of the double-fed wind turbine and the system power flow constraint as constraint conditions; and step 3, solving the reactive optimization model by employing an artificial bee colony algorithm to obtain a system wind power reactive investment scheme. According to the double-fedwind farm reactive output scheme obtained by employing the method, the active loss and the node voltage deviation value of the recovered system can be greatly reduced, and the safety constraint of a power grid in a system recovery process can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a method for optimizing reactive power output of a doubly-fed wind field during system recovery. Background technique [0002] In recent years, wind power, as the most promising renewable energy power generation technology, has developed rapidly in China. Due to the randomness and intermittent characteristics of wind energy, the problem of reactive power and voltage under high wind power penetration is one of the most prominent problems in the current grid-connected operation of wind farms. [0003] At present, domestic newly-built wind farms mainly use variable-speed constant-frequency double-fed induction wind turbines. Usually, large-capacity capacitor banks or static var compensation devices are installed on the outlet bus of the wind farm to adjust the grid-connected point voltage. However, this method not only does not give full play to the fast and flexibl...

AI Technical Summary

Problems solved by technology

However, this method not only does not give full play to the fast and flexible reactive power adjustment capability of the doubly-fed induction wind turbine, but also greatly increases the construction cost of the wind farm due to its high configuration costs.

Images