Feed-forward control system and feed-forward control method for wind generating set based on laser wind finding radar

Abstract

The invention provides a feed-forward control system and a feed-forward control method for a wind generating set based on a laser wind finding radar. The feed-forward control system comprises a laser wind finding radar and a feed-forward controller. The feed-forward controller comprises a data processing unit and a feed-forward logical unit. The data processing unit calculates and sends a real-time wind speed fluctuating value delta V to the feed-forward logical unit; and the feed-forward logical unit calculates the wind speed fluctuating value delta V to obtain an append command vane angle beta which is added to an original variable-pitch controller command vane angle alpha to obtain and send a final variable-pitch command signal theta to a variable-pitch controller. The wind speed feed-forward control is added, so that loads of relevant parts of the wind generating set are reduced, output characteristics of the wind generating set are improved, and the safety of the wind generating set under extreme wind conditions is improved; and a prior running fan system is not needed to be transformed too much, the feed-forward control system and the feed-forward control method have wide adaptability simultaneously and are capable of being used in different environments and easy to implement, loads of parts are reduced, the wind energy utilization rate is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to a feed-forward control method of a wind power generating set based on a laser wind measuring radar, which detects wind conditions in advance and responds to detection signals in advance. Background technique [0002] Wind energy has become one of the most practical forms of renewable energy due to its advantages of wide distribution, reusability and mature technology. The most common way to use wind energy in the past few decades is to capture wind energy to generate electricity through wind turbines equipped with wind turbines. At present, most of the wind rotors of wind turbines operate in the lower part of the near-earth boundary layer, and the wind conditions are greatly affected by the surface conditions. It is impossible to improve the output characteristics of wind turbines. [0003] At present, the wind measuring instruments of wind turbines are mainly the wind cups a...

AI Technical Summary

Problems solved by technology

As mentioned above, due to the randomness and sudden change of wind conditions, and the wind wheel is a component with a large moment of inertia, when the gust arrives, the rise in the rotational speed will be delayed, and the increase in the rotational speed will react until the change occurs. The output of the propeller controller controls the retraction of the pitch actuator, and has a large time delay. The two parts of the delay together form a link with a large time constant, so it is easy to cause overspeed in the case of gusts

In order to cope with this situation, it is generally considered to increase the pitch rate, speed up the pitch response time, and reduce the inertia of the system, which leads to another problem. Too fast action of the pitch actuator will increase the load on the blades and the hub, and at the same time due to If the blades change too fast, the thrust acting on the blades will also show a periodic change characteristic, which will eventually be transmitted to the tower, increasing the bending moment load of the tower

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