A kind of fan speed recovery method and system

Abstract

The invention provides a fan rotation speed recovery method and system. The method includes the following steps: acquiring the fan rotation speed and power grid frequency in real time; judging whetherthe power grid frequency deviates from the rated frequency of a power grid; if the power grid frequency deviates from the rated frequency of the power grid, controlling a fan converter controller according to a first electromagnetic power curve, wherein the first electromagnetic power curve is calculated according to a virtual synchronization control algorithm; judging whether the fan rotation speed drops to a preset first rotation speed limit value; if the fan rotation speed drops to the first rotation speed limit value, controlling the fan converter controller according to a second electromagnetic power curve, wherein the second electromagnetic power curve is calculated according to a proportional-integral algorithm; judging whether the fan rotation speed rises from the first rotation speed limit value to a second rotation speed limit value; and if the fan rotation speed rises from the first rotation speed limit value to the second rotation speed limit value, controlling the fan converter controller according to a third electromagnetic power curve, wherein the third electromagnetic power curve is calculated according to an MPPT algorithm.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a method and system for restoring the rotational speed of a fan. Background technique [0002] In order to solve energy and environmental problems, wind power technology has been developed and applied on a large scale. In order to improve the frequency stability and voltage stability of the power system with large-scale wind power grid-connected, virtual synchronous control technology can be applied to wind turbines. As one of the mainstream models of wind power generation, doubly-fed wind turbines widely adopt the virtual synchronous control method without reserve capacity in engineering applications. When a frequency disturbance event occurs in the grid, the unit provides short-term active power support for the grid by releasing part of the kinetic energy of the rotor. A major advantage of this method is that it improves the economy of wind power operation. However, if ...

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Problems solved by technology

Another scholar proposes cooperative control among different wind turbines in the wind farm, making full use of the difference in output between the wind turbines, and rationally configuring the timing of the wind turbines quitting frequency regulation; however, this method requires a central controller at the station level, and requires high-speed communication network guarantees. Information exchange between the station and the stand-alone

[0004] It can be seen from the above that the existing technologies and methods have the disadvantages of high cost, difficult implementation, and low reliability, and it is difficult to apply them on a large scale in engineering

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