Novel active voltage control strategy for doubly-fed wind power plant

Abstract

The invention discloses a novel active voltage control strategy for a doubly-fed wind power plant, and relates to the technical field of power system control. The control strategy comprises the following steps of: firstly, establishing a dynamic reactive power balance model of the doubly-fed wind power plant and a grid-connected system on the basis of considering the interaction between the reactive power output limit of the wind power plant and the reactive power compensation requirement of the grid-connected system; secondly, calculating a control starting criterion based on a wind power plant active voltage control critical operation point, and generating a wind power plant active voltage control action instruction; judging an active voltage control strategy needing to be executed by each wind turbine generator according to the action instruction; and finally, determining the output reactive power reference value of each wind turbine generator according to an active reactive power distribution strategy to realize the active voltage support of the wind power plant to the grid-connected system. Multiple factors such as wind speed change, reactive power output limit of the wind power plant and reactive power compensation requirements of the grid-connected system are considered, the control effect is obvious, the voltage fluctuation of the grid-connected system can be actively suppressed by the doubly-fed wind power plant, and the method is suitable for engineering practice.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to a novel active voltage control strategy for a double-fed wind farm. Background technique [0002] In the past ten years, the wind power industry has developed rapidly around the world and maintains a huge development potential. However, random changes in wind speed may cause voltage fluctuations at the grid connection point of wind farms, threatening the voltage stability of the grid. With the development of unit converter control technology, doubly fed induction generator (DFIG) has fast and flexible power control capability, which can meet the voltage support requirements of wind power grid connection points. Therefore, it is of great significance to fully exploit and utilize the available reactive power capacity of doubly-fed wind farms to support the grid voltage under the condition of wind speed fluctuations, which is of great significance to improve the voltag...

AI Technical Summary

Problems solved by technology

However, this method ignores the influence of active power on the reactive power output limit of the wind farm and the voltage of the grid-connected point, which may lead to the problem that it is difficult to support the grid voltage due to insufficient reactive power reserve of the wind farm.

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