CN211343212U - Device for eliminating blade shake of hydraulic pitch control system of wind generating set - Google Patents

Abstract

The utility model discloses a device of shake is eliminated to wind generating set hydraulic pressure oar system blade, which comprises a controller, the oar PLC system and the oar executor of becoming of connection controller, the import and the export of the oar executor are connected with the electromagnetic directional valve respectively, the oar PLC system is connected to the electromagnetic directional valve, the electromagnetic directional valve sets for the threshold value and monitors the blade shake through the displacement sensor that becomes the oar PLC system connection, it still is connected with temperature monitoring to become the oar PLC system, bypass solenoid valve, a pressure sensor, the energy storage ware, the electromagnetic directional valve, the proportional directional valve, the cooling pump, fan radiator, and the filter, and gather data transmission to the controller through the oar PLC system of becoming; the utility model discloses do not change and become oar pitch angle precision under the original control program, but become the control that the solenoid directional valve realized the executor hydro-cylinder to hydraulic pressure change oar return circuit increase, control is simple, and the effect is showing.

Description

Device for eliminating blade shake of hydraulic pitch control system of wind generating set

Technical Field

The utility model relates to a wind power generation technical field, concretely relates to device of shake is eliminated to wind generating set hydraulic pressure becomes oar system blade.

Background

The blades of the wind driven generator are the key part for capturing wind energy, the blades are changed in pitch through a control system, and the constant-power operation of the generator set under the condition of high wind is realized by changing the aerodynamic characteristics of the blades. In addition, the cost of the blades is higher, and the cost ratio of the blades is increased along with the requirement that the length of the blades is longer and longer in a low wind speed area. The blade is subjected to the action of wind-carrying fluid, so that the blade is low in rigidity and deforms under the action of wind load, and the blade has an obvious fluid-solid coupling characteristic. Especially for long blades, blade flutter is easily caused under the excitation of wind load. Flutter is generally caused by the fact that the flutter frequency of the blade is close to the natural frequency of the blade, and most patent and literature methods adopt a blade damping technology. However, the problem of blade shake caused by the requirement of the precision of pitch control when the unit is in a standby mode (the blades are in a feathering position) below the cut-in wind speed exists, and the problems related to the existing patent and literature data are not found. The problem is mainly that the control precision requirement of the blade is high, so that the blade does not fluctuate slightly under the optimal pitch angle. However, because of high control precision, in the standby mode, the actuating power system and the valve block of the blade are in a real-time adjusting state, and the blade is easy to be excited to generate low-frequency jitter. This low frequency flutter can cause the blade to vibrate periodically, which can cause damage to the blade if the frequency of vibration is close to the natural frequency of the blade. Therefore, the problem of blade shaking in the feathering state is solved by changing a hydraulic pitch control loop.

Generally, the wind frequency ratio is large below the rated wind speed of a wind power plant, and the power generation of a unit is mostly below the rated power. In order to ensure that the blades of the unit work at the optimal pitch angle, the requirement on the precision of the position of the variable pitch angle is high, so that the maximum wind capturing capacity below the rated power is realized. Therefore, in order to ensure the precision requirement, the voltage of the variable pitch proportional valve is dynamically adjusted to ensure that the error value of the variable pitch angle does not exceed the set allowable value.

The dynamic adjustment of the variable pitch proportional valve improves the precision of the blades of the generator set under the power generation working condition, but under the feathering condition, the proportional valve has higher adjusting frequency, and the actuator gives the instantaneous thrust of the blades. When the cylinder body is operated, the vanes are likely to shake because of their small rigidity and long length.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a device of shake is eliminated to wind generating set hydraulic pressure becomes oar system blade.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a device that wind generating set hydraulic pressure becomes oar system blade and eliminate shake, includes the controller, the oar PLC system and the oar executor of becoming of connection controller, the import and the export of becoming the oar executor are connected with the electromagnetic directional valve respectively, and the electromagnetic directional valve is connected and is become the oar PLC system, and the electromagnetic directional valve sets for the threshold value and monitor the blade shake through the displacement sensor that becomes oar PLC system connection, becomes oar PLC system and still is connected with temperature monitoring, bypass solenoid valve, pressure sensor, energy storage ware, electromagnetic directional valve, proportional directional valve, cooling pump, fan radiator, and filter to through becoming oar PLC system acquisition data transmission to the controller.

Specifically, the blade shake is the blade shake under the non-power-generation working condition caused by high control precision requirement.

Specifically, the blade fluttering occurs in a feathering process, and the feathering process is divided into normal shutdown and emergency feathering.

Specifically, the set threshold value of the electromagnetic directional valve is 0.5 m.

Specifically, the hydraulic pitch control system further comprises oil, a one-way valve, an overflow valve, a manual stop valve, a fan, a motor and a motor.

The utility model discloses following beneficial effect has:

the utility model relates to a device for eliminating the shake of the blades of the hydraulic pitch control system of the wind generating set, which is realized by replacing a manual stop valve with an electromagnetic directional valve, and by monitoring the shake of the blades, a controller powers on the electromagnetic directional valve to lock a pitch control actuator, thereby avoiding the shake of the blades caused by the real-time action of a proportional directional valve; the precision of the pitch angle of the variable pitch under the original control program is not changed, the control of an actuator oil cylinder is realized by adding an electromagnetic reversing valve aiming at a hydraulic pitch changing loop, the control is simple, and the effect is obvious.

Drawings

FIG. 1 is a structural block diagram of a device for eliminating blade shake of a hydraulic pitch system of a wind generating set.

FIG. 2 is a flow chart of the device for eliminating the blade shake of the hydraulic pitch system of the wind generating set.

In the figure: 1-temperature detection; 2, a motor; 3-a motor; 4-bypass electromagnetic valve; 5-a one-way valve I; 22-one-way valve II; 25-one-way valve III; 31-check valve four; 6, a first overflow valve; 12-overflow valve II; 23-overflow valve III; 7-a first pressure sensor; 13-a second pressure sensor; 8, a first energy accumulator; 9-first energy accumulator; 10-a first electromagnetic directional valve; 11-a second electromagnetic directional valve; 14-a third electromagnetic directional valve; 16-electromagnetic directional valve four; 17-electromagnetic directional valve five; 20-electromagnetic directional valve six; 21-electromagnetic directional valve seven; 15-proportional reversing valve; 24-a manual stop valve I; 26-a manual stop valve II; 18-a displacement sensor; 19-a hydraulic actuator; 27-a fan radiating pipe; 28-a fan; 29-a filter; 30-oil liquid; 32-cooling pump.

Detailed Description

The technical solution in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, a device for eliminating blade shake of a hydraulic pitch system of a wind generating set comprises a controller, a pitch PLC system and a pitch actuator, wherein the pitch PLC system and the pitch actuator are connected with the controller, an inlet and an outlet of the pitch actuator are respectively connected with an electromagnetic directional valve, the electromagnetic directional valve is connected with the pitch PLC system, the electromagnetic directional valve sets a threshold value and monitors blade shake through a displacement sensor connected with the pitch PLC system, the pitch PLC system is further connected with a temperature monitor, a bypass electromagnetic valve, a pressure sensor, an energy accumulator, the electromagnetic directional valve, a proportional directional valve, a cooling pump, a fan radiator and a filter, and data collected by the pitch PLC system is transmitted to the controller.

The hydraulic system of the unit realizes the startup and shutdown control and the pitch regulation control of the unit.

When the variable pitch PLC system monitors that the system pressure value is lower than the set lower threshold value of 210bar, the motor 2 drives the motor 3 to work, and oil returns to the oil tank 29 through the bypass electromagnetic directional valve 4, so that the functions of cleaning a pipeline and building pressure in no-load are mainly achieved. When no-load pressure build-up is carried out for 2s, the bypass electromagnetic directional valve 4 is electrified and is closed, and pressure build-up is carried out on the actuator.

In the opening process (starting process), the oil passes through the one-way valve I5 → the manual stop valve II 26 → the one-way valve III 25 → the electromagnetic directional valve III 14 → the left position (a) of the proportional control valve 15 → the electromagnetic directional valve VI 20 → the hydraulic actuator 19 → the electromagnetic directional valve IV 16 → the right position (b) of the proportional control valve 15 → the filter 29 → the oil tank 30 to realize the opening action.

During the feathering process (normal shutdown), oil liquid passes through the one-way valve I5 → the manual stop valve II 26 → the one-way valve III 25 → the electromagnetic directional valve III 14 → the proportional control valve 15 at the right position (b) → the electromagnetic directional valve IV 16 → the electromagnetic directional valve V17 → the hydraulic actuator 19 → the electromagnetic directional valve VI 20 → the one-way valve II 22 → the proportional control valve 15 at the right position (b) to realize differential feathering.

It should be noted that in the normal shutdown process, the oil in the oil outlet of the actuator returns to the inlet of the proportional valve through the pipeline to form a differential circuit, so that the feathering speed is increased.

In the feathering process (emergency feathering), the oil liquid passes through the second energy accumulator → the first electromagnetic directional valve 10/the second electromagnetic directional valve 11 → the fifth electromagnetic directional valve 17 → the hydraulic actuator 19 → the sixth electromagnetic directional valve 20 → the seventh electromagnetic directional valve 21 → the filter 29 → the oil tank 30 to realize the emergency feathering.

It should be noted that, only in the case of emergency feathering, the first electromagnetic directional valve 10, the second electromagnetic directional valve 11 and the seventh electromagnetic directional valve 21 are de-energized, so that the pressure of the accumulator is released to push the actuator to feather.

The variable-pitch hydraulic station obtains real-time pressure of the hydraulic station through a first pressure sensor 7; the actuator pressure of the blade is obtained through a second pressure sensor 13; the pitch angle is calculated as the pitch control angle by the displacement of the cylinder body obtained by the displacement sensor 18.

Generally, the wind frequency ratio is large below the rated wind speed of a wind power plant, and the power generation of a unit is mostly below the rated power. In order to ensure that the blades of the unit work at the optimal pitch angle, the requirement on the precision of the position of the variable pitch angle is high, so that the maximum wind capturing capacity below the rated power is realized. Therefore, in order to ensure the accuracy requirement, the proportional directional valve 15 dynamically adjusts the voltage of the proportional valve to ensure that the error value of the pitch angle does not exceed the set allowable value.

The precision of the blades of the generator set under the power generation working condition is improved by frequent action of the proportional reversing valve 15, but under the feathering condition, the adjusting frequency of the proportional valve is higher, and the frequency of the blades adjusted by the actuator is higher. When the hydraulic cylinder body operates, the vanes are likely to shake because of their small rigidity and long length.

In order to avoid causing the blade to shake, the manual stop valve can be replaced by the electromagnetic directional valve on the premise of not changing the control precision of the controller. When the situation that the blade shakes due to the real-time action of the proportional valve can be avoided, the controller enables the electromagnetic directional valve to be electrified and locks the hydraulic cylinder body.

As shown in fig. 2, when the unit is in a non-power generation condition, when the blade displacement sensor detects a blade displacement value and the blade displacement value is filtered by the filter, the maximum value of the filtering value is greater than a program-set threshold value and the duration is greater than 30s, the pitch control program gives an enable signal of the electromagnetic directional valve five 17, so that the electromagnetic directional valve is switched to the right position, and the locking of the actuator of the cylinder body is realized. When the unit enters a starting state and needs to be started, the five electromagnetic directional valves 17/the six electromagnetic directional valves 20 are powered on, and the starting is realized through the proportional directional valve 15.

It should be noted that the filter time constant is 50, the set threshold is 0.5m, and the non-power generation working condition of the unit means that the grid side of the converter of the unit is not modulated.

The utility model discloses not be limited to above-mentioned embodiment, anybody should learn the structural change who makes under the teaching of the utility model, all with the utility model discloses have the same or close technical scheme, all fall into the utility model discloses an within the protection scope.

The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims (5)

1. The device for eliminating the blade shake of the hydraulic pitch control system of the wind generating set is characterized by comprising a controller, a pitch control PLC system and a pitch control actuator, wherein the pitch control PLC system and the pitch control actuator are connected with the controller, an inlet and an outlet of the pitch control actuator are respectively connected with an electromagnetic directional valve, the electromagnetic directional valve is connected with the pitch control PLC system, the electromagnetic directional valve sets a threshold value and monitors the blade shake through a displacement sensor connected with the pitch control PLC system, the pitch control PLC system is further connected with a temperature monitor, a bypass electromagnetic valve, a pressure sensor, an energy accumulator, the electromagnetic directional valve, a proportional directional valve, a cooling pump, a fan radiator and a filter, and data are collected and transmitted to the controller through the.

2. The device for eliminating the blade shake of the hydraulic pitch system of the wind generating set according to claim 1, wherein the blade shake is the blade shake under the non-power-generation working condition caused by high control precision requirement.

3. The device for eliminating the blade shake of the hydraulic pitch system of the wind generating set according to claim 2, wherein the blade shake occurs in a feathering process, and the feathering process is divided into a normal stop and an emergency feathering.

4. The device for eliminating the blade shake of the hydraulic pitch system of the wind generating set according to claim 1, wherein the set threshold value of the electromagnetic directional valve is 0.5 m.

5. The device for eliminating the blade shake of the hydraulic pitch system of the wind generating set according to claim 1, wherein the hydraulic pitch system further comprises oil, a one-way valve, an overflow valve, a manual stop valve, a fan, a motor and a motor.

Images