Intelligent pitch control system of wind turbine generator and pitch control method thereof

Abstract

The invention discloses an intelligent pitch control system of a wind turbine generator and a pitch control method of the intelligent pitch control system. The system comprises a backup energy resource, a hub rotation speed sensor and a plurality of sets of pitch control devices for respectively controlling a plurality of blades of the wind turbine generator to change pitch angles, wherein the number of the sets of the pitch control devices is consistent with the number of the blades, and the pitch control devices are in one-to-one correspondence with the blades; each set of the pitch control devices comprises a pitch control drive control unit, a pitch control actuator and a pitch control angle sensor connected with the pitch control drive control unit; and the hub rotation seed sensor and the pitch control drive control units are arranged in a hub. According to the method disclosed by the invention, a rotation speed control algorithm of the wind turbine generator is transferred to the pitch control drive control units in the pitch control system from a main controller, a real-time control signal in a pitch control PLC (Programmable Logic Controller) and a pitch control slide ring in the conventional pitch control system is cancelled, a fault rate of the pitch control slide ring communication is lowered, response time of the pitch control controller for rotation speed control is reduced, and cost of the pitch control slide ring is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an intelligent pitch pitch system and pitch pitch method of a wind turbine. Background technique [0002] my country is rich in wind energy resources, and wind power develops rapidly. At present, the wind power equipment manufacturing industry has ranked among the top in the world. The pitch system is an important part of the wind turbine, and it is the main component to realize the stable power and safe operation of the wind turbine. The pitch system mainly operates when the rated wind speed is above the rated wind speed. The main controller will drive the pitch system according to the change of wind speed, dynamically change the pitch angle of the three blades, and control the air torque acting on the wind rotor, so that the rotor speed is maintained at rated value. The pitch system is also the main actuator of the unit's parking brake. When the fan stops, the p...

AI Technical Summary

Problems solved by technology

[0004] The traditional pitch system has disadvantages such as slow response, frequent faults, and poor reliability. This is because the pitch system is installed in the hub and is a rotating component. The communication between the main controller and the pitch system needs to be realized through a slip ring.

The slip ring is one of the main failure points of the unit, and its working status has a great influence on the communication with the main control system and the pitch change, and the transfer of the pitch change command through the slip ring will cause a large communication delay

If the communication delay of the control signal of the pitch control system is too large, the pitch angle will not be able to respond to the wind speed change in time, which will aggravate the load and power fluctuation of the unit, and affect the life of the unit and the power quality, especially when the wind turbine is under low voltage ride through. , due to the slow response of the pitch system, it may cause the unit to overspeed and stop, causing damage to the power grid

At the same time, the pitch control system is the main actuator of the unit's parking brake and an important part of the safety system. Its reliability directly affects the safety of the system. At present, the overspeed alarm signal of the system is introduced into the pitch by the external slip ring, and there may be failures Failure to respond in a timely manner, resulting in potential safety hazards in the system

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