A motor control and protection method for variable pitch hydraulic station

Abstract

The invention discloses a method for controlling and protecting a motor of a pitch hydraulic station, which comprises the following steps: being compatible with the original control system, adding a new control mode and improving the start-stop control mode of the motor of a pitch hydraulic station. , pitch angle, pitch actuator pressure, pitch hydraulic station pressure, and unit power limit signal are monitored to improve the start-stop control mode of the pitch hydraulic station motor and achieve rotation control through pulse switching, referring to the pulse module TP_1 and the pulse module The pulse signal of TP_2 realizes alternate control; the motor control and protection method of the variable pitch hydraulic station designed by the present invention makes statistics through the existing variable parameters of the unit, without introducing new equipment, and is economical; the control logic is simple, easy to implement, and robust Good; good compatibility, not limited by the model and wind conditions of the wind field, and strong adaptability; the availability of the unit is improved, and the service life of components is improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a motor control and protection method for a pitch hydraulic station. Background technique [0002] To achieve constant power control of wind turbines under strong wind conditions, it is necessary to dynamically adjust the pitch angle characteristics to maintain the balance of aerodynamic characteristics. The electric pitch adopts the frequency converter to dynamically adjust the motor to realize the hydraulic pitch action, and the hydraulic pitch control system monitors the pressure of the actuator and the hydraulic station through the pressure sensor, and realizes the motor control of the hydraulic station according to the monitored pressure. When the monitored pressure is lower than the threshold set by the program, the motor of the pitch hydraulic station is started to build up the system pressure. Generally, the S1 system is selected for the motor, but consider...

AI Technical Summary

Problems solved by technology

On the one hand, this method consumes about 20kW of active power to maintain the continuous operation of the motor, which leads to an increase in the self-consumption of the unit, and the noise in the cabin for a long time; on the other hand, due to the continuous operation of the motor, the heat generated by components and circuits is large, reducing Component life

Because wind farms generally belong to low wind speed areas, excessive self-consumption reduces the market competitiveness of the whole machine

The hydraulic pitch motor control of the unit is controlled according to the pressure of the pitch actuator or the pressure of the pitch hydraulic station. Although it can ensure that the motor of the unit does not start continuously, which reduces the self-consumption power of the unit, but when the pitch frequency of the unit is high and the pressure value When there are high-frequency fluctuations near the threshold, large leakage in the slip ring or large leakage in the actuator seal, the pitch motor will start and stop frequently, and the start and stop cycle is small, which will easily lead to damage to the motor and components

Images