Control system and method for redundant and safe blade retraction of fan variable pitch system

Abstract

The invention provides a control system and method for redundant and safe blade retraction of a fan variable pitch system. The control system comprises a detection unit, a control unit and a redundantcircuit which are connected, the detection unit is used for detecting the speed of a fan hub and transmitting a signal to the control unit, and the control unit judges whether the fan hub is overspeed or not according to the signal of the fan hub speed; and when the fan hub is overspeed, a redundant circuit is controlled to be closed, then the redundant circuit triggers a backup power source blade retraction loop of the variable pitch system to work, and the redundant circuit is normally open. The control system and the control method for redundant and safe blade retraction of the fan variable pitch system are redundant control measures for starting an emergency blade retraction loop when a fan has a serious fault, and provide safety protection for the fan in an emergency state.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a control system and method for redundant and safe pitch retraction of a fan pitch system. Background technique [0002] my country's wind power industry is booming, and its installed capacity has risen steadily, making important contributions to the effective use of green energy, clear water and blue sky, and the realization of sustainable development in my country. The safety and stability of wind turbine operation has always been the focus of attention and research, and the pitch system is the final actuator control system of the wind turbine. crucial impact. [0003] The pitch control system of wind turbines built in the early stage is mainly a DC pitch system, and its safe propeller retraction logic is completely controlled by the main controller: general faults are controlled by the master controller; for serious faults, the master controller disconnects the safety chai...

AI Technical Summary

Problems solved by technology

However, practice has shown that the above design has major safety hazards. Due to the untimely operation and maintenance of the fan or improper maintenance methods, the back-up power supply propeller retracting circuit is very likely not to be triggered reliably, and the propellers cannot be retracted to a safe position, causing the fan to overrun and cause an accident. ; In addition, when the motor is directly driven by the backup power supply, the running speed is uncontrollable, which will cause a large impact on the fan tower

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