Control method of wind farm automatic voltage system

Abstract

The invention discloses a control method of a wind farm automatic voltage system. By analyzing the response speed, the amount of compensation and the limiting factors of the use conditions of the existing reactive power compensation method, the practical use-based control method of the wind farm automatic voltage control system is proposed according to the characteristics of different reactive power supplies. The strategy is divided into two parts: a steady state control method and a transient control method. According to the invention, a wind farm has sufficient reactive power reserve capacity to cope with system failures on the premise of providing sufficient reactive power output, so as to ensure that the wind farm is in the most economical operating state. On the basis, coordinated andorderly operation and switching of a large number of reactive power sources in the wind farm are completed.

Description

technical field [0001] The invention belongs to the field of electric power system and automation thereof, and in particular relates to a control method of an automatic voltage system of a wind farm. Background technique [0002] In recent years, with the development of wind power technology, the single-unit capacity of wind turbines has been gradually increased, and the scale of wind farms has also been expanding. The impact of wind farms on the power grid can no longer be ignored. Induction Generator, DFIG) and direct-drive wind turbines have more and more calls for reactive power potential. The traditional reactive power compensation methods of wind farms have been difficult to adapt to the current development situation of wind power in my country. Therefore, since 2010, some domestic wind farms have begun to build automatic voltage control systems in wind farms in accordance with the model of thermal power plants. By building an automatic voltage control system, the safe...

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Problems solved by technology

At present, the reactive power distribution method between wind turbines used in the automatic voltage control system of wind farms is mostly the equal power factor distribution method. According to this method, the automatic voltage control system that distributes reactive power between wind turbines can ensure the common connection point of the wind farm. The voltage is stable within the required range, but due to the different adjustment costs of different reactive power sources, it is impossible to ensure that the wind farm is in the most economical operating state, and the reactive power capacity of the unit has not been fully utilized

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