CN116201779A - Wind generating set, hydraulic pitch control system thereof and control method thereof - Google Patents

Wind generating set, hydraulic pitch control system thereof and control method thereof Download PDF

Info

Publication number
CN116201779A
CN116201779A CN202111449579.6A CN202111449579A CN116201779A CN 116201779 A CN116201779 A CN 116201779A CN 202111449579 A CN202111449579 A CN 202111449579A CN 116201779 A CN116201779 A CN 116201779A
Authority
CN
China
Prior art keywords
chamber
solenoid valve
oil
valve
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111449579.6A
Other languages
Chinese (zh)
Inventor
李萌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Original Assignee
Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Goldwind Science and Creation Windpower Equipment Co Ltd filed Critical Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority to CN202111449579.6A priority Critical patent/CN116201779A/en
Publication of CN116201779A publication Critical patent/CN116201779A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/328—Blade pitch angle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/60—Control system actuates through
    • F05B2270/604—Control system actuates through hydraulic actuators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The disclosure provides a wind generating set, a hydraulic pitch system thereof and a control method thereof. The hydraulic pitch system includes: the pitch cylinder is provided with a first chamber and a second chamber; the driving unit drives the hydraulic oil to form a plurality of oil supply and return paths; a first electromagnetic valve connected between the pitch cylinder and the driving unit and formed on both the oil supply and return path of the second chamber and the oil supply and return path of the first chamber; the second electromagnetic valve is connected between the first electromagnetic valve and the first chamber and is arranged on the oil supply and return path of the first chamber; a first check valve connected between the first chamber and an oil supply port of the first solenoid valve and disposed on a second oil return path of the first chamber; and under the normal shutdown working condition, before the piston rod of the pitch cylinder extends to a preset position, the first chamber releases hydraulic oil through the second oil return path, and when the piston rod of the pitch cylinder extends to or beyond the preset position, the first chamber releases the hydraulic oil through the first oil return path.

Description

Wind generating set, hydraulic pitch control system thereof and control method thereof
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind generating set, a hydraulic pitch system thereof and a control method thereof.
Background
On the one hand, when the pitch system of the wind generating set is driven by hydraulic oil, an oil cylinder is generally used as an actuating mechanism. When the pitch is changed, the rotation of the pitch-changing bearing is realized through the extension and retraction of the piston rod of the oil cylinder, so that the rotation of the blade is driven, and the change of the pitch angle is realized. In the hydraulic pitch system, the power of the hydraulic pitch system is as low as possible under the constraint of the condition of the wind generating set, so the pitch system is generally made into a differential loop, namely when the second chamber of the oil cylinder is filled with oil and the first chamber is discharged with oil, the hydraulic oil in the first chamber can flow back to the second chamber of the oil cylinder, and the supply of the oil cylinder or the energy accumulator is saved. However, the arm of the cylinder will vary with the length of extension of the cylinder rod, so the maximum output torque of the cylinder is varying. For example, when the pitch angle is 90 °, the moment arm is the smallest, that is, the driving moment is smaller and smaller during the blade feathering shutdown, and the situation of driving the non-moving blade may occur.
On the other hand, when the wind generating set is hoisted, pitch is performed to center bolts on the blades and bolt holes of the pitch bearings. The power source that causes the pitch action of the pitch system is often a temporary power source. However, when the temporary power supply is used for driving the pitch system to work, if the temporary power supply fails, the pitch system is powered off, so that the pitch system triggers emergency feathering, which brings huge risks to a unit, and in particular, the risk that the blades fall off when single-blade hoisting is performed can occur. The external equipment is used for driving the pitch control system to control the pitch, so that the risk of triggering emergency feathering can be avoided, related equipment is required to be additionally designed, and the installation time and the disassembly time of the external equipment are increased during hoisting.
Disclosure of Invention
One of the purposes of the present disclosure is to provide a hydraulic pitch system that is capable of increasing the driving force of a pitch cylinder.
It is an object of the present disclosure to provide a hydraulic pitch system that can be used for blade lifting.
According to a first aspect of the present disclosure, there is provided a hydraulic pitch system comprising: the pitch cylinder is provided with a first chamber and a second chamber; the driving unit drives hydraulic oil in the hydraulic pitch system to form a plurality of oil supply and return paths; a first electromagnetic valve connected between the pitch cylinder and the driving unit and formed on both a supply and return path of the second chamber and a supply and return path of the first chamber, the supply and return path of the first chamber including a first return path, the supply and return path of the second chamber including a first supply path; the second electromagnetic valve is connected between the first electromagnetic valve and the first chamber and is arranged on the oil supply and return path of the first chamber; a first check valve connected between the first chamber and an oil supply port of the first solenoid valve and disposed on a second oil return path of the first chamber, the second oil return path being different from the first circuit path; and under the normal shutdown working condition, before the piston rod of the pitch cylinder extends to a preset position, the first chamber releases hydraulic oil through the second oil return path, and when the piston rod of the pitch cylinder extends to or beyond the preset position, the first chamber releases the hydraulic oil through the first oil return path.
According to a second aspect of the present disclosure, a wind power plant is provided, comprising a hydraulic pitch system as described above.
According to a third aspect of the present disclosure, there is provided a control method of a hydraulic pitch system, the hydraulic pitch system being as described above, the control method comprising: in response to a normal shutdown condition, before a piston rod of the pitch cylinder extends to a preset position, controlling a first electromagnetic valve to be in a first working state and controlling a second electromagnetic valve to be in the first working state, so that the first cavity releases hydraulic oil through a second oil return path; when the piston rod of the pitch cylinder extends to or beyond a preset position, the first electromagnetic valve is controlled to be in a first working state, the second electromagnetic valve is controlled to be in a second working state, and the first chamber releases hydraulic oil through the first oil return path.
The hydraulic pitch system according to the embodiment of the disclosure can improve the safety of the hydraulic pitch system.
According to the hydraulic variable pitch system, when the hydraulic variable pitch system is used for hoisting, under the condition that the system is powered down, the emergency feathering is not triggered, so that the unit is kept in a safe state, the operation is simple, and the time is saved.
Drawings
The foregoing and/or other objects and advantages of the disclosure will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a hydraulic pitch system according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a hydraulic pitch system according to a second embodiment of the present disclosure;
fig. 3 is a schematic diagram of a hydraulic pitch system according to a third embodiment of the present disclosure.
Detailed Description
The hydraulic pitch system according to the embodiments of the present disclosure is used for normal pitch during in-service operation, for example, different hydraulic circuits may be activated or selected under normal shutdown conditions, so that in the case of a reduced driving force arm, the pitch drive torque may be increased, ensuring normal operation of the system.
According to the hydraulic pitch system, when the feathering is stopped, before the driving blades are stopped to the feathering position, the differential hydraulic circuit is closed, the oil return path of the first chamber and the oil tank is activated, so that the pressure difference between the second chamber and the first chamber is increased, the driving moment of the pitch cylinder at the tail section of the feathering of the driving blades is improved, and normal feathering is executed.
The hydraulic pitch system according to the embodiment of the disclosure can be used for hoisting, is particularly suitable for hoisting single blades, and can close a stop valve on an oil supply path of a second chamber which is separately arranged for hoisting in the hoisting process, so that a piston rod of an oil cylinder is prevented from being undesirably stretched out when power is lost, and the operation convenience and the safety are improved.
Embodiments of the present disclosure will be described below with reference to the drawings, in which like numbers refer to like elements throughout.
Fig. 1 is a schematic diagram of a hydraulic pitch system according to a first embodiment of the present disclosure, fig. 2 is a schematic diagram of a hydraulic pitch system according to a second embodiment of the present disclosure, and fig. 3 is a schematic diagram of a hydraulic pitch system according to a third embodiment of the present disclosure.
According to an embodiment of the present disclosure, the hydraulic pitch system comprises a pitch cylinder 8, a drive unit 1, a first solenoid valve 6, a second solenoid valve 7 and a first one-way valve 12.
As shown in fig. 1 to 3, the pitch cylinder 8 may have a first chamber and a second chamber. The second chamber may be a rodless chamber and the first chamber may be a rod chamber. As an example, an elastic member such as a spring may be further provided in the second chamber.
The rod of the pitch ram 8 may be connected to the piston of the pitch ram 8 and may be extended when the blade feathers and retracted when the blade is opened by the pressure difference between the second chamber and the first chamber.
The drive unit 1 may drive the hydraulic oil in the hydraulic pitch system to form a plurality of oil supply and return paths. The driving unit 1 is a component capable of supplying high-pressure oil to the hydraulic system to drive the pitch cylinder to act.
For example, the drive unit 1 may include an accumulator, and although not shown, hydraulic oil in a hydraulic tank may be driven by a hydraulic pump to flow into the accumulator, and the drive unit 1 may include auxiliary components such as a hydraulic pump.
As shown in fig. 1 and 3, the first solenoid valve 6 may be connected between the pitch cylinder 8 and the driving unit 1 and formed on both the oil supply and return path of the second chamber and the oil supply and return path of the first chamber. That is, the first solenoid valve 6 may be formed on a common oil supply and return path of the second chamber and the first chamber. The oil supply and return path of the first chamber may comprise a first oil return path and the oil supply and return path of the second chamber may comprise a first oil supply path.
The first solenoid valve 6 may be a single solenoid valve or a valve group formed by different solenoid valves. For example, when the first solenoid valve 6 is a valve group, the first solenoid valve 6 may include a plurality of solenoid valves, one portion of which may be disposed on the oil supply and return path of the second chamber to selectively activate the oil supply and return path of the second chamber, and another portion of which may be disposed on the oil supply and return path of the first chamber to selectively activate the oil supply and return path of the first chamber.
In addition, the first solenoid valve 6 may also be a single solenoid valve, for example, the first solenoid valve 6 may be a multi-position, multi-solenoid valve, specifically, the first solenoid valve 6 may be a three-position, four-way solenoid valve, a three-position, five-way solenoid valve, or the like, as long as the second chamber can supply oil through one path of the single solenoid valve and the first chamber can return oil through the other path of the single solenoid valve.
When the first electromagnetic valve 6 is a three-position four-way electromagnetic valve, an A port of the three-position four-way electromagnetic valve can be communicated with the second chamber, a B port of the three-position four-way electromagnetic valve can be communicated with the first chamber, a P port of the three-position four-way electromagnetic valve can be used as an oil supply port to be communicated with the driving unit 1, and a T port of the three-position four-way electromagnetic valve can be used as an oil return port to be communicated with a hydraulic oil tank 50 of the hydraulic pitch system.
According to an embodiment of the present invention, the second solenoid valve 7 may be connected between the first solenoid valve 6 and the first chamber and may be disposed on the oil supply return path of the first chamber. The second electromagnetic valve 7 can be conducted in a bidirectional or unidirectional way as required, so that the oil return path of the first chamber passing through the first electromagnetic valve is selectively connected into the oil path. For example, the second solenoid valve 7 may be turned on (bi-directionally turned on) when the first chamber returns via the first return path, and the second solenoid valve 7 may close the first return path when the first chamber returns via the other return path.
For example, when pitching normally, the second solenoid valve 7 may be bi-directionally conductive, hydraulic oil may be supplied to the first chamber via the second solenoid valve 7 (when pitching is performed), and hydraulic oil of the first chamber may also be released via the second solenoid valve 7 (when feathering is performed). In particular, at the end of the feathering shutdown, the second solenoid valve 7 may be switched from one-way to two-way conduction, and the hydraulic oil of the first chamber may be switched via other return paths to return from the second solenoid valve 7 to the hydraulic tank.
As shown in fig. 1 and 3, the second electromagnetic valve 7 may be a two-position two-way electromagnetic valve, the port B of which may be in communication with the first chamber, and the port a of which may be in communication with the first electromagnetic valve 6. However, the present disclosure is not limited thereto, and the second solenoid valve 7 may be a valve group including a solenoid valve, for example, the second solenoid valve may be implemented by a combination of a check valve and a solenoid valve, the second solenoid valve may be implemented by a plurality of solenoid valves, the second solenoid valve 7 may be a multi-position, multi-way solenoid valve as long as the second solenoid valve 7 can activate the oil supply and return path of the first chamber, and may break the oil return path of the first chamber through the second solenoid valve 7, if necessary.
As shown in fig. 1 and 3, the a port of the first solenoid valve 6 as a three-position four-way solenoid valve may be communicated with the second chamber, the B port of the first solenoid valve as a three-position four-way solenoid valve may be communicated with the a port of the second solenoid valve 7 as a two-position two-way solenoid valve, the P port of the first solenoid valve 6 as a three-position four-way solenoid valve may be communicated with the driving unit 1 as an oil supply port, the T port of the first solenoid valve 6 as a three-position four-way solenoid valve may be communicated with the hydraulic tank 50 of the hydraulic pitch system as an oil return port, and the B port of the second solenoid valve 7 as a two-position two-way solenoid valve may be communicated with the first chamber.
In this disclosure, "a communicates with B" includes both cases where a communicates directly with B and where there are other components between a and B.
As shown in fig. 1 and 3, the first check valve 12 may be connected between the first chamber and the oil supply port of the first solenoid valve 6 and provided on a second oil return path of the first chamber, where the second oil return path is a different circuit path from the first circuit path of the first chamber mentioned above. The difference between the two paths means that at least one different component is provided on the two paths, and at least one different component is provided on the path through which the hydraulic oil flows.
The inlet of the first one-way valve 12 may be in communication with the first chamber and the outlet of the first one-way valve 12 may be in communication with the oil supply port of the first solenoid valve 6.
As an example, shut-off valves may also be provided in the oil supply and return paths of the second chamber and the first chamber for ease of use during maintenance.
According to an embodiment of the present disclosure, under normal shutdown conditions, the first chamber may release hydraulic oil via the second oil return path before the piston rod of the pitch ram 8 is extended to a predetermined position, and the first chamber may release hydraulic oil via the first oil return path when the piston rod of the pitch ram 8 is extended to or beyond the predetermined position.
As shown in fig. 1 and 3, before the piston rod of the pitch cylinder 8 extends to a predetermined position, the first oil supply path of the second chamber may be: the driving unit 1→the P port of the first solenoid valve 6→the a port of the first solenoid valve 6→the second chamber, and the second oil return path of the first chamber may be: first chamber (rod-like chamber) →first check valve 12→oil supply port of first solenoid valve 6.
When the piston rod of the pitch cylinder 8 is extended to or beyond a predetermined position, the first oil supply path of the second chamber may be: the driving unit 1→the P port of the first solenoid valve 6→the a port of the first solenoid valve 6→the second chamber, and the first oil return path of the first chamber may be: the first chamber (rod chamber) →the second solenoid valve 7→the port B of the first solenoid valve 6→the port T of the first solenoid valve 6→the hydraulic oil tank 50.
As shown in fig. 1 and 3, according to an embodiment of the present disclosure, the hydraulic pitch system may further include a third solenoid valve 9, and the third solenoid valve 9 may be connected between the first chamber and the oil return port of the first solenoid valve 6 and disposed on the third oil return path of the first chamber. The third oil return path of the first chamber is different from both the first oil return path and the second oil return path.
Specifically, during a fail-safe condition, the third solenoid valve 9 may be turned on to activate the third oil return path. The third solenoid valve 9 may be a normally closed solenoid valve. For example, the third solenoid valve 9 may be turned on or off in the event of a power loss, and the hydraulic oil in the first chamber may be rapidly discharged to the hydraulic tank 50 via the third solenoid valve 9. Specifically, the third solenoid valve 9 may be bi-directionally conductive in the event of power loss, and may shut off the relief oil passage of the first chamber through the third oil return path in the event of power loss.
The third solenoid valve 9 may be a two-position two-way solenoid valve, the a port of the two-position two-way solenoid valve may be communicated with the first chamber, the B port of the two-position two-way solenoid valve may be communicated with the oil return port of the first solenoid valve 6, and the oil return port of the first solenoid valve 6 may be communicated with a hydraulic oil tank for collecting low-pressure oil.
As an example, a second throttle 11 may be further provided on the third oil return path of the first chamber, and the port B of the third solenoid valve 9 may be in communication with the inlet of the second throttle 11, and the outlet of the second throttle may be in communication with the oil return port of the hydraulic oil tank 50 or the first solenoid valve 6.
The oil supply port and the oil return port of the first solenoid valve 6 may be separated by a first shut-off valve 13, that is, a first shut-off valve 13 may be provided between the driving unit 1 as an accumulator and the T port of the first solenoid valve 6 as a three-position four-way solenoid valve, so that high pressure oil supplied from the driving unit 1 may be separated from low pressure oil collected from the hydraulic oil tank 50.
For the hydraulic system, the following control mode can be adopted: in response to a normal stop condition (pitch back), the first solenoid valve 6 may be controlled to be in a first operating state (e.g., before the piston rod of the pitch cylinder 8 is extended to a predetermined position (e.g., 2/3 th of a line)) and the second solenoid valve may be controlled to be in a first operating state, causing hydraulic oil in the drive unit 1 to be supplied to the second chamber via the first oil supply path while hydraulic oil in the first chamber is released via the first oil return path. Here, the different operating states of the first solenoid valve 6 and the second solenoid valve 7 may be different power supply states for the first solenoid valve 6 and the second solenoid valve 7, the difference in power supply states resulting in the two solenoid valves being in different operating states.
After the piston rod of the pitch cylinder 8 has been extended to or beyond a predetermined position, the first solenoid valve 6 may be controlled to be in a first operating state and the second solenoid valve may be controlled to be in a second operating state, the first chamber releasing hydraulic oil via the first oil return path.
Specifically, when the first solenoid valve 6 is in the first operating state, the first solenoid valve adopts the first commutation path (from p→a, from b→t), and when the second solenoid valve 7 is in the first operating state, the second solenoid valve 7 adopts the first commutation path (the oil return path is off). When the second electromagnetic valve 7 is in the second operating state, the second electromagnetic valve 7 adopts a second commutation path (bi-directional conduction path).
As an example, the operating states of the first solenoid valve 6 and the second solenoid valve 7 may be controlled by the pitch controller 10, that is, the spool positions of the two solenoid valves may be controlled by the control of the power supply modes thereof by the pitch controller 10.
As shown in fig. 1 and 3, the hydraulic pitch system may further comprise a pitch controller 10, which may control the first solenoid valve 6 and the second solenoid valve 7 to activate the second chamber and the oil supply and return path of the first chamber.
Pitch controller 10 may be implemented in hardware, such as an integrated circuit, or a combination of hardware and software. Although the location of the specific controllers is not shown in the drawings, the pitch controller may be provided within the nacelle as an example.
According to the embodiment of the disclosure, the hydraulic pitch system can also close the stop valve on the oil supply path of the second chamber separately arranged for hoisting in the hoisting process, so that the oil cylinder is prevented from being undesirably extended when power is lost.
As shown in fig. 2 and 3, according to an embodiment of the present disclosure, the hydraulic pitch system further includes a fourth solenoid valve 5 and a second shut-off valve 15 disposed on a second oil supply path of the second chamber, where the second oil supply path of the second chamber may be different from the first oil supply path of the second chamber.
An inlet of the fourth solenoid valve 5 may be in communication with the driving unit 1, an outlet of the fourth solenoid valve 5 may be in communication with an inlet of the second shut-off valve 15, and an outlet of the second shut-off valve 15 may be in communication with the second chamber.
When the hydraulic pitch system according to the embodiment of the present disclosure is used for hoisting a blade, under the working condition that the hoisting tool fails, the fourth electromagnetic valve 5 may be turned on, and the second stop valve 15 is closed. The fourth electromagnetic valve 5 may be a normally closed electromagnetic valve, the fourth electromagnetic valve 5 may be turned on in one direction under the condition of power supply, and the fourth electromagnetic valve 5 may be turned on in two directions under the condition of power failure. As shown in fig. 3, the fourth solenoid valve 5 may shut off the third oil supply path of the second chamber together with the second check valve 4 when turned on unidirectionally.
On the other hand, in the operating mode in which power is normally generated and emergency feathering is triggered, the fourth solenoid valve 5 is turned on and the second shutoff valve 15 is opened. For example, the fourth solenoid valve 5 may be turned on in both directions in the event of power loss.
As an example, the hydraulic pitch system may further include a first throttle valve 3 and a second check valve 4 provided on the second oil supply path of the second chamber, an inlet of the first throttle valve 3 may communicate with the driving unit 1, an outlet of the first throttle valve 3 may communicate with an inlet of the second check valve 4, and an outlet of the second check valve 4 may communicate with an inlet of the fourth solenoid valve 5.
In one example, the second shut-off valve 15 may be provided with a position sensor, and when the pitch is normal, the spool position of the second shut-off valve 15 may be judged by the position sensor of the second shut-off valve, thereby ensuring that the second shut-off valve 15 remains in the closed state.
As shown in fig. 1 to 3, according to an embodiment of the present disclosure, the hydraulic pitch system may further include a first relief valve 2 and a second relief valve 14, the first relief valve 2 may be disposed between the driving unit 1 and the second chamber of the pitch cylinder 8, and the second relief valve 14 may be disposed between the driving unit 1 and the oil supply port of the first solenoid valve 6.
In addition to the components described above, the hydraulic pitch system may also include other auxiliary components. As shown in fig. 2, the hydraulic pitch system may further comprise a third shut-off valve 21 and a fourth shut-off valve 22.
The third shut-off valve 21 may be disposed on a common path of different oil supply paths of the second chamber and the fourth shut-off valve 22 may be disposed on a common path of different oil return paths of the first chamber.
The return oil filter may be provided in the return path of the hydraulic oil tank, and the supply oil filter may be provided in the supply path of the hydraulic oil tank, or the empty filter may be provided in the hydraulic oil tank.
It should be noted that although not shown in the figures, embodiments of the present disclosure may include other various auxiliary components (e.g., shut-off valve, check valve, pressure sensor, oil filter), etc.
According to the hydraulic pitch system disclosed by the embodiment of the invention, different hydraulic circuits can be activated or selected under the normal shutdown working condition, so that the pitch driving moment can be increased under the condition that the driving force arm is reduced, and the normal operation of the system is ensured.
According to the hydraulic pitch system, when the feathering is stopped, before the driving blades are stopped to the feathering position, the differential hydraulic circuit is closed, the oil return path of the first chamber and the oil tank is activated, so that the pressure difference between the second chamber and the first chamber is increased, the driving moment of the pitch cylinder at the tail section of the feathering of the driving blades is improved, and normal feathering is executed.
The foregoing is merely a preferred embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions (e.g., the features of the different embodiments disclosed herein may be combined) that are easily conceivable by those skilled in the art within the technical scope of the present disclosure, are intended to be included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims (11)

1. A hydraulic pitch system, comprising:
a pitch cylinder (8) having a first chamber and a second chamber;
the driving unit (1) drives the hydraulic oil in the hydraulic pitch system to form a plurality of oil supply and return paths;
a first solenoid valve (6) connected between the pitch cylinder (8) and the drive unit (1) and formed simultaneously on a supply-return path of the second chamber including a first return path and a supply-return path of the first chamber including a first supply path;
a second solenoid valve (7) connected between the first solenoid valve (6) and the first chamber and provided on the oil supply and return path of the first chamber;
a first one-way valve (12) connected between the first chamber and an oil supply port of the first solenoid valve (6) and provided on a second oil return path of the first chamber, the second oil return path being different from the first oil return path;
and under the normal shutdown working condition, before the piston rod of the pitch cylinder (8) extends to a preset position, the first chamber releases hydraulic oil through the second oil return path, and when the piston rod of the pitch cylinder (8) extends to or beyond the preset position, the first chamber releases hydraulic oil through the first oil return path.
2. Hydraulic pitch system according to claim 1, further comprising a third solenoid valve (9), said third solenoid valve (9) being connected between the first chamber and an oil return port of the first solenoid valve (6) and being arranged on a third oil return path of the first chamber, said third solenoid valve (9) being conductive to activate said third oil return path, which is different from both the first oil return path and the second oil return path, in a fail-shut condition.
3. The hydraulic pitch system according to claim 2, characterized in that the third solenoid valve (9) is a two-position two-way solenoid valve, the a-port of which is in communication with the first chamber, and the B-port of which is in communication with the oil return port of the first solenoid valve (6).
4. The hydraulic pitch system according to claim 1, wherein the second solenoid valve (7) is a two-position two-way solenoid valve, the B port of which is two-way to the first chamber, and the a port of which is two-way to the first solenoid valve (6).
5. The hydraulic pitch system according to claim 4, wherein the first solenoid valve (6) is a three-position four-way solenoid valve, an a port of the three-position four-way solenoid valve is communicated with the second chamber, a B port of the three-position four-way solenoid valve is communicated with an a port of the two-position two-way solenoid valve, a P port of the three-position four-way solenoid valve is communicated with the driving unit (1) as an oil supply port, and a T port of the three-position four-way solenoid valve is communicated with a hydraulic oil tank (50) of the hydraulic pitch system as an oil return port.
6. Hydraulic pitch system according to claim 5, characterized in that the drive unit (1) comprises an accumulator, which communicates with the P-port of the three-position four-way solenoid valve, and that a first shut-off valve (13) is arranged between the accumulator and the T-port of the three-position four-way solenoid valve.
7. The hydraulic pitch system according to claim 1, further comprising a fourth solenoid valve (5) and a second shut-off valve (15) arranged on a second oil supply path of the second chamber, the inlet of the fourth solenoid valve (5) being in communication with the drive unit (1), the outlet of the fourth solenoid valve (5) being in communication with the inlet of the second shut-off valve (15), the outlet of the second shut-off valve (15) being in communication with the second chamber, the second oil supply path being different from the first oil supply path,
under the working condition that the hoisting tool is powered off, the fourth electromagnetic valve (5) is turned on, and the second stop valve (15) is closed;
under the working conditions of normal power generation and emergency feathering triggering, the fourth electromagnetic valve (5) is conducted and the second stop valve (15) is opened.
8. The hydraulic pitch system according to claim 7, further comprising a first throttle valve (3) and a second one-way valve (4) arranged on the second oil supply path of the second chamber, the inlet of the first throttle valve (3) being in communication with the drive unit (1), the outlet of the first throttle valve (3) being in communication with the inlet of the second one-way valve (4), the outlet of the second one-way valve (4) being in communication with the inlet of the fourth solenoid valve (5).
9. The hydraulic pitch system according to any one of claims 1 to 8, further comprising a pitch controller configured to control the first solenoid valve (6) and the second solenoid valve (7) to activate the oil supply and return paths of the first chamber and the second chamber.
10. A wind power plant comprising a hydraulic pitch system according to any of claims 1 to 9.
11. A control method of a hydraulic pitch system, characterized in that the hydraulic pitch system is according to any one of claims 1-9, the control method comprising:
in response to a normal stop condition, before a piston rod of a pitch cylinder (8) extends to a preset position, controlling a first electromagnetic valve (6) to be in a first working state and controlling a second electromagnetic valve (7) to be in the first working state, so that a first chamber releases hydraulic oil through the second oil return path;
when the piston rod of the pitch cylinder (8) extends to or beyond a preset position, the first electromagnetic valve (6) is controlled to be in a first working state, the second electromagnetic valve (7) is controlled to be in a second working state, and the first chamber releases hydraulic oil through the first oil return path.
CN202111449579.6A 2021-11-30 2021-11-30 Wind generating set, hydraulic pitch control system thereof and control method thereof Pending CN116201779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111449579.6A CN116201779A (en) 2021-11-30 2021-11-30 Wind generating set, hydraulic pitch control system thereof and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111449579.6A CN116201779A (en) 2021-11-30 2021-11-30 Wind generating set, hydraulic pitch control system thereof and control method thereof

Publications (1)

Publication Number Publication Date
CN116201779A true CN116201779A (en) 2023-06-02

Family

ID=86506506

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111449579.6A Pending CN116201779A (en) 2021-11-30 2021-11-30 Wind generating set, hydraulic pitch control system thereof and control method thereof

Country Status (1)

Country Link
CN (1) CN116201779A (en)

Similar Documents

Publication Publication Date Title
US9850916B2 (en) Fail-safe actuation system
JP5270685B2 (en) Electro-hydraulic actuator for controlling the pitch of wind turbine blades
EP2740944B1 (en) Electro hydrostatic actuator system for retracting/extending landing gear
US9926950B2 (en) Hydraulic system for construction machinery
JP4866274B2 (en) Hydraulic device
US10808734B2 (en) Apparatus for controlling a hydraulic machine
US20130243624A1 (en) Rotor Blade Pitch Adjustment Device
CN101498281B (en) Direct drive type hydraulic variable pitch controlling mechanism for wind power generator
WO2017171021A1 (en) Hydraulic system and emergency operation method
CN105645324A (en) Cantilever crane motion hydraulic system and tunnel lagging jack operating vehicle
EP2458202A1 (en) Pilot circuitry for controlling the emergency feathering of a wind turbine
CN202082175U (en) Hydraulic control system and concrete pumping system equipped with same
US10962032B2 (en) Apparatus for controlling a hydraulic machine
CN116201779A (en) Wind generating set, hydraulic pitch control system thereof and control method thereof
CN115875345A (en) Hydraulic control system of rocket oscillating bar
CN213744202U (en) Control system of hydraulic cylinder and excavator
CN111473007B (en) Water delivery valve hydraulic system for emergency operation of ship lock and emergency valve closing operation method
CN210290290U (en) Hydraulic system for emergent feathering of fan and fan variable pitch execution system
CN109231031B (en) Winch telescopic hydraulic control loop and engineering machinery applying same
CN108071619B (en) Variable-pitch hydraulic system and wind generating set
CN206495747U (en) A kind of impulse turbine jet deflector control device
CN214221280U (en) Blast furnace gas residual pressure turbine device and control system
CN113586532B (en) Construction machine
CN217870707U (en) Energy recovery hydraulic system and excavator
CN113530782B (en) Large displacement pump with rapid pressure cut-off protection function and protection method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination