Backup auxiliary system of wind generating set

Abstract

The invention discloses a backup auxiliary system of a wind generating set. The backup auxiliary system comprises a small wind turbine, a charger, a backup power source, a first switching device, a second switching device, a third switching device and a control module. The small wind turbine is connected with the charger through the first switching device, the charger is connected with the backup power source, the control module is in communication connection with the small wind turbine, the first switching device is connected with the second switching device and the third switching device, the backup power source is connected with the second switching device and the third switching device, the second switching device is connected with a variable pitch system, the third switching device is connected with a yaw system, and the first switching device, the second switching device, the third switching device, the charger, the backup power source, the variable pitch system and the yaw system are in communication connection with the control module. The small wind turbine is controlled through the control module, then the backup power source is charged through the charger, and the stability of the set is guaranteed.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a backup auxiliary system of wind power generators. Background technique [0002] In large-scale wind turbines, the pitch system controls the speed of the wind rotor by controlling the angle of the blades, and then controls the output power of the wind turbine; at the same time, the pitch system acts as the main brake system of the unit. Various detection and control methods and multiple redundant designs ensure the safe and stable operation of the wind turbine. Any shutdown caused by a fault will feather the blades to a 90-degree position. [0003] At the same time, in large-scale wind turbines, the deflection of the wind rotor is controlled through the yaw system according to the main wind direction of the incoming air flow, so as to ensure that the plane of the wind rotor faces the wind in real time, and then control the output power of the wind turbine. Through ...

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Problems solved by technology

[0004] However, during the operation of the wind turbine, power failure of the power grid, abnormality of the charger, abnormality of the backup power supply of the pitch system, etc. will occur, and the occurrence of these abnormalities may cause the blades of the wind turbine to be unable to retract to a safe position ( For example, the pitch angle is 90 degrees); especially in the case of power failure of the grid and abnormality of the backup power supply, the degree of danger is higher for the electric pitch system; if the blades of the wind turbine cannot be retracted to a safe position, the Under the action of wind force, the speed of the wind turbine cannot be reduced, causing the wind turbine to overspeed or even the danger of speeding

[0005] At present, there is no better control method for wind turbine blades that cannot retract their propellers. Only by leeward yaw, that is, by yawing, the wind turbine yaws 90 degrees and deviates from the wind direction, thereby reducing the speed of the wind turbine and realizing However, the disadvantage of this method is that during normal operation, the wind turbine can absorb the maximum wind energy by turning the blade pitch angle to 0 degrees, that is, the force-bearing surface of the blade is perpendicular to the wind direction; In the process of shutting down and retracting the blades, the pitch angle of the blades will gradually increase, so that the wind energy absorbed by the blades will decrease, and the speed will decrease. After retracting the propeller), instead, the stressed surface of the blade will be perpendicular to the wind direction again, and the force on the blade will be increased again. This situation, on the one hand, will cause the speed of the wind turbine rotor to drop slowly, on the other hand, it will also cause the The wind turbine bears a greater load, which is not conducive to the safety of the wind turbine

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