A method for rapid location and safe shutdown of hydraulic pitch faults

Abstract

The invention discloses a fast hydraulic variable pitch fault positioning and safe stopping method which comprises the following steps of: variable data acquisition, quick determination and positioning of a fault valve block and stopping mode selection, wherein variable data acquisition comprises the following steps that a master control PLC is in communication connection to a variable pitch PLC through a CANopen, the variable pitch PLC is connected to electromagnetic reserving valves, a proportional directional valve, a pressure sensor and a displacement sensor with feedback signals, the twoelectromagnetic reserving valves with feedback signals and a signal of the three-position four-way proportional directional valve are transmitted to a command control PLC through the variable pitch PLC as control logic judgment, and the displacement sensor monitors a displacement value of a cylinder block to obtain the actual pitch angle. By adopting the electromagnetic reserving valves with feedback signals, the variable pitch fault valve block is judged accurately; by judging the fault valve block, stopping in different modes is executed, so that the safety of a unit is improved; and by positioning the fault quickly, the working difficulty of field operation and maintenance staff is reduced, and the work efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for quickly locating a hydraulic variable pitch fault and safely shutting down. Background technique [0002] The pitch system is the key system of the wind turbine. The speed and power of the unit can be adjusted by changing the aerodynamic characteristics of the blades by adjusting the pitch angle. However, the pitch system is a system with a high failure rate during unit operation. Because the impeller is located on the top of the tower, when performing maintenance, it is first necessary to lock the impeller and adjust a suitable pitch blade to meet the operating conditions required by the operation and maintenance personnel, resulting in long maintenance hours and complicated operations for the operation and maintenance personnel. Skill requirements are high. Especially for offshore units, due to poor maintainability, it is necessary to ensure the sta...

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Problems solved by technology

There is no patent related to the rapid diagnosis method of the fault in the pitch system and the shutdown method under the fault condition

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