CN107908916B - Device and method for constructing simulation model of hydraulic variable-pitch mechanism - Google Patents
Device and method for constructing simulation model of hydraulic variable-pitch mechanism Download PDFInfo
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Abstract
An apparatus and method for constructing a simulation model of a hydraulic pitch mechanism are provided, the apparatus comprising: the load data processing module is used for determining the torque of the variable-pitch bearing required by executing the variable-pitch action based on the load data; the variable pitch mechanism design module is used for determining working parameters required by the operation of the driving element based on the load data, the variable pitch bearing torque and the primary selection parameters; the hydraulic component model selection module is used for determining characteristic parameters of a specific hydraulic component of the simulation model; the response frequency setting module is used for determining the resonance frequency of the simulation model and setting the response frequency of the simulation model to be a frequency smaller than the resonance frequency; and the variable pitch model generating module is used for generating a simulation model of the hydraulic variable pitch mechanism suitable for the preset wind area. According to the device and the method, the hydraulic variable pitch mechanism which meets the preset wind area can be accurately designed, the design and development time is effectively reduced, and the design flow is simplified.
Description
Technical Field
The invention relates to the field of power electronic equipment design, in particular to a device and a method for constructing a simulation model of a hydraulic variable pitch mechanism.
Background
The variable pitch mechanism is a device which is arranged in a fan hub and used for air braking or controlling the power of a unit by changing the angle of a blade, and is an important control and protection device of the wind turbine, wherein the variable pitch precision of the variable pitch mechanism not only influences the stability of the output power of the wind turbine, but also influences the utilization rate of wind energy.
At present, there are two main types of pitch mechanisms: the hydraulic variable-pitch mechanism and the electric variable-pitch mechanism are generally applied due to the characteristics of large transmission torque, light weight, accurate positioning, high dynamic response speed of the actuating mechanism and the like. The hydraulic variable-pitch mechanism mainly comprises a hydraulic pump station, a proportional reversing valve, an energy accumulator and an executing mechanism, wherein the electric hydraulic pump is working power, hydraulic oil is a transmission medium, the proportional reversing valve is a control element, and the variable pitch of the blades is realized by changing the radial motion of a piston rod of the oil cylinder into the circular motion of the blades, so that the variable pitch of the wind turbine generator is realized. At present, the hydraulic variable-pitch mechanism is long in design and development time and complex in design process.
Therefore, the existing mode for designing the hydraulic variable-pitch mechanism cannot meet the requirements of wind power generation enterprises on design flow and development time.
Disclosure of Invention
The invention provides a device and a method for constructing a simulation model of a hydraulic variable pitch mechanism, and the device and the method provided by the invention can overcome the defects of long development period and high design complexity of the existing hydraulic variable pitch mechanism.
According to an aspect of exemplary embodiments of the present invention, there is provided an apparatus for constructing a simulation model of a hydraulic pitch mechanism, the apparatus including: the load data processing module is used for acquiring load data at the blade root of a target wind turbine generator in a preset wind area and determining the variable-pitch bearing torque required by the simulation model to execute the variable-pitch action based on the load data; the variable pitch mechanism design module is used for acquiring the initial selection parameters of the driving element of the simulation model input by a user and determining the working parameters required by the operation of the driving element of the simulation model based on the load data, the variable pitch bearing torque and the initial selection parameters; the hydraulic component model selection module is used for acquiring preset parameters input by a user and determining characteristic parameters of a specific hydraulic component of the simulation model based on load data, variable-pitch bearing torque, working parameters and the preset parameters; the response frequency setting module is used for acquiring the Young modulus of the simulation model and the inertia mass of the variable-pitch rotating shaft input by a user, determining the resonance frequency of the simulation model based on the working parameters of the driving element, the Young modulus and the inertia mass of the variable-pitch rotating shaft, and setting the response frequency of the simulation model to be less than the resonance frequency; and the variable pitch model generation module is used for generating a simulation model of the hydraulic variable pitch mechanism suitable for the preset wind area based on the working parameters of the driving element, the characteristic parameters of the specific hydraulic element and the response frequency of the simulation model.
Optionally, the payload data processing module stores the payload data in a data form of a structure.
Optionally, the payload data comprises: and the pitch angle, the pitch changing speed and the force and moment components borne by the blade root of the simulation model.
Optionally, the initial parameters of the simulation model include: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed and system working pressure.
Optionally, the pitch mechanism design module comprises: the initial selection parameter acquisition module is used for acquiring initial selection parameters of the driving element of the simulation model input by a user; the working parameter calculation module is used for calculating the oil cylinder rodless cavity piston area, the oil cylinder rod cavity piston area, a variable pitch mechanism loading capacity curve, the oil cylinder stroke length, the piston rod movement speed and the variable pitch torque which can be provided by the simulation model on the basis of the pitch angle, the variable pitch speed, the variable pitch bearing torque and the primary selection parameters; and the working parameter determining module is used for respectively judging whether the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided can meet corresponding specific requirements or not, and determining working parameters required by the operation of the driving element of the simulation model according to the judgment result.
Optionally, if the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch variation torque which can be provided can meet corresponding specific requirements, setting the current initially selected parameters of the driving element, the calculated piston area of the rodless cavity of the oil cylinder, the piston area of the rod cavity of the oil cylinder, the loading capacity curve of the pitch variation mechanism, the stroke length of the oil cylinder, the movement speed of the piston rod and the pitch variation torque which can be provided as working parameters of the driving element of the simulation model; and if the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided cannot meet corresponding specific requirements, repeating the operation of the initial selection parameter acquisition module, the operation of the operation parameter calculation module and the operation parameter determination module by acquiring the initial selection parameters of the driving element again.
Optionally, the operating parameter calculation module performs the following operations: calculating the stroke length of the oil cylinder by using the driving radius of the oil cylinder, the maximum loading pitch angle and the support radius of the oil cylinder; calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the support radius of the oil cylinder, the maximum loading pitch angle and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed; calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder; calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod; calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder; and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
Optionally, the specific requirement for the stroke length of the oil cylinder means that the stroke length of the oil cylinder of the simulation model needs to be smaller than the distance from the axis of the variable pitch drive disc to the inner wall of the hub; the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod; the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
Optionally, the specific hydraulic component comprises: proportional reversing valve, accumulator and oil pump.
Optionally, the characteristic parameter of the proportional directional valve comprises a predetermined outlet flow rate of the proportional directional valve; the characteristic parameters of the accumulator comprise the volume and the pre-charging pressure of the accumulator; the characteristic parameters of the oil pump comprise: oil pump displacement, oil pump motor speed and oil pump motor power.
Optionally, the apparatus further comprises: the working condition identification module is used for determining reference data of the simulation model based on the load data for subsequent evaluation or guidance of a user, wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed.
According to another aspect of exemplary embodiments of the present invention, there is provided a method of constructing a simulation model of a hydraulic pitch mechanism, the method comprising: (A) load data of a blade root of a target wind turbine generator in a preset wind area are obtained, and variable-pitch bearing torque required by the simulation model for executing variable-pitch action is determined based on the load data; (B) acquiring initial selection parameters of a driving element of the simulation model input by a user, and determining working parameters required by the operation of the driving element of the simulation model based on load data, variable pitch bearing torque and the initial selection parameters; (C) acquiring preset parameters input by a user, and determining characteristic parameters of a specific hydraulic element of the simulation model based on load data, variable-pitch bearing torque, working parameters and the preset parameters; (D) acquiring the Young modulus of the simulation model and the inertia mass of the variable-pitch rotating shaft input by a user, determining the resonance frequency of the simulation model based on the working parameters of the driving element, the Young modulus and the inertia mass of the variable-pitch rotating shaft, and setting the response frequency of the simulation model to be less than the resonance frequency; (E) and generating a simulation model of the hydraulic variable pitch mechanism suitable for the preset wind area based on the working parameters of the driving element, the characteristic parameters of the specific hydraulic element and the response frequency of the simulation model.
Optionally, step (a) further comprises: and storing the load data in a data form of a structural body.
Optionally, the payload data comprises: and the pitch angle, the pitch changing speed and the force and moment components borne by the blade root of the simulation model.
Optionally, the initial parameters of the simulation model include: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed and system working pressure.
Optionally, step (B) comprises: (B1) acquiring initial selection parameters of a driving element of the simulation model input by a user; (B2) calculating the piston area of an oil cylinder rodless cavity, the piston area of an oil cylinder rod cavity, a variable pitch mechanism loading capacity curve, the oil cylinder stroke length, the piston rod movement speed and the variable pitch torque which can be provided of the simulation model on the basis of the pitch angle, the variable pitch speed, the variable pitch bearing torque and the primary selection parameters; (B3) and respectively judging whether the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided can meet corresponding specific requirements, and determining working parameters required by the operation of a driving element of the simulation model according to the judgment result.
Optionally, the step (B3) further includes: if the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided can meet corresponding specific requirements, setting the current primary selection parameters of the driving element, the calculated piston area of the rodless cavity of the oil cylinder, the piston area of the rod cavity of the oil cylinder, the loading capacity curve of the pitch-variable mechanism, the stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided as working parameters of the driving element of the simulation model; and if the calculated cylinder forming length, the piston rod movement speed and the pitch torque which can be provided cannot all meet the corresponding specific requirements, repeatedly executing the steps (B1), (B2) and (B3) by re-acquiring the initial selection parameters of the driving element.
Optionally, step (B2) includes: calculating the stroke length of the oil cylinder by using the driving radius of the oil cylinder, the maximum loading pitch angle and the support radius of the oil cylinder; calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the maximum loading pitch angle, the support radius of the oil cylinder and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed; calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder; calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod; calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder; and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
Optionally, the specific requirement for the stroke length of the oil cylinder means that the stroke length of the oil cylinder of the simulation model needs to be smaller than the distance from the axis of the variable pitch drive disc to the inner wall of the hub; the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod; the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
Optionally, the specific hydraulic component comprises: proportional reversing valve, accumulator and oil pump.
Optionally, the characteristic parameter of the proportional directional valve comprises a predetermined outlet flow rate of the proportional directional valve; the characteristic parameters of the accumulator comprise the volume and the pre-charging pressure of the accumulator; the characteristic parameters of the oil pump comprise: oil pump displacement, oil pump motor speed and oil pump motor power.
Optionally, the method further comprises: (F) determining reference data of the simulation model for subsequent evaluation or guidance by a user based on the load data, wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed.
According to another aspect of exemplary embodiments of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the method of constructing a simulation model of a hydraulic pitch mechanism according to the present invention.
According to another aspect of exemplary embodiments of the present invention, there is provided a computing device including: a processor; a memory storing a computer program which, when executed by the processor, implements a method of constructing a simulation model of a hydraulic pitch mechanism according to the invention.
According to the device and the method for constructing the simulation model of the hydraulic variable-pitch mechanism, the hydraulic variable-pitch mechanism which meets the preset wind area can be accurately designed, the design and development time is effectively reduced, the design process is simplified, and the designed hydraulic variable-pitch mechanism model is simple to operate, high in visualization degree and good in expansibility.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other objects and features of exemplary embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
FIG. 1 shows a block diagram of an apparatus for building a simulation model of a hydraulic pitch mechanism according to an exemplary embodiment of the invention;
FIG. 2 illustrates a block diagram of a pitch mechanism design module according to an exemplary embodiment of the present invention;
FIG. 3 shows a flow diagram of a method of building a simulation model of a hydraulic pitch mechanism according to an exemplary embodiment of the invention;
fig. 4 shows a flow chart of the steps of determining an operating parameter of a drive element according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
FIG. 1 shows a block diagram of an apparatus for building a simulation model of a hydraulic pitch mechanism according to an exemplary embodiment of the invention.
As shown in fig. 1, an apparatus for constructing a simulation model of a hydraulic pitch mechanism according to an exemplary embodiment of the present invention includes: the system comprises a load data processing module 100, a pitch mechanism design module 200, a hydraulic component model selection module 300, a response frequency setting module 400 and a pitch model generation module 500.
The load data processing module 100 obtains load data at a blade root of a target wind turbine generator in a predetermined wind zone, and determines a variable-pitch bearing torque required by the simulation model to execute a variable-pitch action based on the load data.
Specifically, the load data processing module 100 reads load data output by the fan design software GH Bladed, and stores the read load data in a data form of a structural body for later recall, where the load data may include a pitch angle of the simulation model, a pitch speed, and a force and moment component borne by a blade root, and the load data may further include other load data used for subsequent control analysis or evaluation, for example, a low-full-speed wind speed, a full-speed wind speed, and the like, which is not limited herein.
As an example, in the case where load data is acquired, the load data processing module 100 may calculate a pitch bearing torque required for the simulation model to perform a pitch action by the following equation (1-1) using the load data:
Mpitch＝Mfric+Mzequation (1-1)
Wherein M ispitchFor pitch bearing torque, MfricFor friction torque of pitch bearings, MzThe direction of each moment vector can be determined by the direction of the variable pitch speed for the z component of the torque borne by the blade root.
Wherein the friction torque M of the pitch bearingfricThe calculation being made by the load carried by the blade root, e.g. the friction torque M of the pitch bearingfricCan be calculated by the following equation (1-2):
wherein mu is the friction coefficient of the variable-pitch bearing, MxyXy component of blade root bending moment, FaRadial forces to the blade root, FrAxial forces to the blade root, dmIs the diameter of the raceway of a pitch bearing, wherein the coefficient of friction mu and the diameter d of the racewaymAre all intrinsic characteristic parameters.
The variable pitch mechanism design module 200 acquires the initial selection parameters of the driving element of the simulation model input by a user, and determines the working parameters required by the operation of the driving element of the simulation model based on the load data, the variable pitch bearing torque and the initial selection parameters.
Next, a pitch mechanism design module 200 according to an exemplary embodiment of the invention will be described in detail with reference to FIG. 2. FIG. 2 illustrates a block diagram of a pitch mechanism design module 200 according to an exemplary embodiment of the present invention.
As shown in FIG. 2, pitch mechanism design module 200 includes a preliminary parameter acquisition module 210, an operating parameter calculation module 220, and an operating parameter determination module 230.
Specifically, the initial parameter acquiring module 210 acquires initial parameters of the driving elements of the simulation model input by the user. Here, as an example, the initial parameters are attribute parameters of the driving element input by the user empirically, for example, the initial parameters of the simulation model input by the user may include: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed and system working pressure.
The working parameter calculation module 220 calculates the cylinder rodless cavity piston area, the cylinder rod cavity piston area, the pitch mechanism loading capacity curve, the cylinder stroke length, the piston rod movement speed and the pitch variation torque which can be provided of the simulation model based on the pitch angle, the pitch variation speed, the pitch variation bearing torque and the primary selection parameters. Here, the variable pitch mechanism loading capacity curve refers to a curve of cylinder output and variable pitch torque change which can be provided by a hydraulic variable pitch mechanism based on a pitch angle. Specifically, the working parameter calculation module 220 may calculate the cylinder stroke length using the cylinder drive radius, the maximum load pitch angle, and the cylinder support radius; calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the maximum loading pitch angle, the support radius of the oil cylinder and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed; calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder; calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod; calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder; and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
For example, the operating parameter calculation module 220 calculates the cylinder stroke length of the simulation model by the following equation (2-1):
wherein, l is the stroke length of the oil cylinder, R is the driving radius of the oil cylinder, R is the supporting radius of the oil cylinder, and α is the included angle between the driving radius of the oil cylinder and the supporting radius of the oil cylinder, wherein α ═ θ + (arccos (R/R) - θ)max) Where θ is the pitch angle, θmaxThe maximum loaded pitch angle.
After the stroke length l of the oil cylinder is obtained, the variable-pitch drive power arm l is determined through an equation (2-2) based on the trigonometric function relationarm：
larmAs Rrsin α/l, equation (2-2)
Accordingly, the operating parameter calculation module 220 also calculates the piston rod movement speed by the following equation (2-3):
v＝ωlarmequation (2-3)
Wherein v is the motion speed of the piston rod, and omega is the variable pitch speed.
In addition, since the pitch driving force arms provided by the pitch mechanism in the feathering state and the pitching state are not the same, the working parameter calculating module 220 calculates the pitch driving force arms provided by the pitch mechanism in the feathering state and the pitching state by the following equations (2-4) and (2-5), respectively:
feathering state: m ═ kPsys(Abore-Aring)larmEquation (2-4)
The oar opening state: m ═ kPsysAringlarmEquation (2-5)
Wherein M is the variable pitch torque, k is the number of driven oil cylinders, PsysTo system operating pressure, AboreIs the area of the piston of the rodless cavity of the oil cylinder, AringFor the area of the piston of the rod cavity of the oil cylinder
Here, the area A of the piston of the rodless chamber of the cylinderboreThe diameter of the piston of the rodless cavity of the oil cylinder can be determined, for example: area A of piston of rodless cavity of oil cylinderboreCan be calculated by the following equations (2-6):
wherein d isboreThe diameter of the piston of the rodless cavity of the oil cylinder.
Here, the cylinder has a rod chamber piston area AringBy the area of the piston of the rodless chamber of the cylinder and the area of the piston rod of the cylinder, e.g. piston area A of the rod chamber of the cylinderringCan be calculated by the following equations (2-7):
wherein A ismIs the area of the piston rod of the cylinder, dmThe diameter of the piston rod of the oil cylinder.
After the stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided are calculated, the working parameter determining module 230 determines whether the calculated stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided can meet corresponding specific requirements, respectively, and determines working parameters required by the operation of the driving element of the simulation model according to the determination result. As an example, the specific requirement for the stroke length of the oil cylinder means that the stroke length of the oil cylinder of the simulation model needs to be smaller than the distance from the axis of the variable pitch drive disc to the inner wall of the hub; the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod; the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
As an example, if the calculated stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided can all meet corresponding specific requirements, the current initially selected parameters of the driving element, the calculated piston area of the rodless cavity of the cylinder, the piston area of the rod cavity of the cylinder, the loading capacity curve of the pitch mechanism, the stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided are set as the working parameters of the driving element of the simulation model.
In addition, if at least one of the calculated cylinder forming length, the piston rod movement speed and the pitch torque that can be provided does not meet the corresponding specific requirements, the operations of the preliminary selection parameter acquisition module, the working parameter calculation module and the working parameter determination module are repeated by reacquiring the preliminary selection parameters of the driving element. For example, the initial selection parameter obtaining module 210 obtains the initial selection parameter newly input by the user; the working parameter calculation module 220 re-determines the stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided by the simulation model based on the initially selected parameters newly input by the user; and the working parameter determining module judges again based on the newly determined stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided by the simulation model until the stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided by the simulation model can meet corresponding specific requirements.
Referring again to fig. 1, the hydraulic component selection module 300 obtains predetermined parameters input by a user, and determines characteristic parameters of a specific hydraulic component of the simulation model based on the load data, the pitch bearing torque, the operating parameters, and the predetermined parameters. Here, the specific hydraulic component includes, as an example: proportional reversing valve, accumulator and oil pump. Specifically, the characteristic parameter of the proportional reversing valve comprises a predetermined outlet flow rate of the proportional reversing valve; the characteristic parameters of the accumulator comprise the volume and the pre-charging pressure of the accumulator; the characteristic parameters of the oil pump comprise: the oil pump displacement, the oil pump motor rotation speed and the oil pump motor power; the predetermined parameters input by the user may include the adiabatic coefficient of the accumulators, the number of accumulators, the minimum operating temperature of the simulation model, the maximum operating temperature of the simulation model, the number of proportional reversing valves, and the total power coefficient of the oil pump.
As an example, in the sizing of the proportional directional valve, a predetermined outlet flow rate at the maximum moving speed among moving speeds of the piston rod may be used as a characteristic parameter of the proportional directional valve, and in particular, the hydraulic component sizing module 300 may calculate a predetermined outlet (e.g., a-port) flow rate of the proportional directional valve using the following equation (3-1):
Qa＝kvmaxa, (Eq.3-1)
Wherein Q isaIs the flow of the port a of the proportional reversing valve, vmaxThe maximum speed in the moving speed of the piston rod is A, the equivalent piston area of the oil cylinder driven by the port a of the proportional reversing valve is A, and in a slurry state, A is Abore-Aring(ii) a In the slurry state, A ═ Aring。
The characteristic parameters of the accumulator model selection include the accumulator pre-charge pressure and the accumulator volume, which are both determined by the emergency feathering action performed by the accumulator, and the process of determining these two characteristic parameters will be described in detail below.
In equation (3-2), MEMThe variable pitch moment is provided for the energy accumulator during emergency feathering, and nitrogen of the energy accumulator is in an adiabatic state in the process; delta lmaxIs the maximum variation of the stroke length of the oil cylinder, delta lmax＝lmax-lmin. Wherein lmaxIs the maximum cylinder stroke length lminThe minimum stroke length of the oil cylinder; beta is adiabatic coefficient, generally 0.4, N is the number of accumulators, VcThe volume of nitrogen in the accumulator at the lowest operating temperature, wherein VcWith accumulator pre-charge pressure P0Closely related, derived by an ideal gas state equation, the relation is:
Vc＝VP0Tmin/PsysT0equation (3-3)
In equation (3-3), TminThe minimum working temperature of the hydraulic variable-pitch mechanism is determined by the actual working condition of the wind turbine generator, the variable-pitch torque provided by the hydraulic variable-pitch mechanism is the minimum value at the temperature, and T0The temperature of the pre-charging is 20 ℃, and V is the volume of the energy accumulator.
On the other hand, the hydraulic element selection module 300 may calculate the volume V of the accumulator using the following equation (3-4):
V＝Vliquid+Vhgasequation (3-4)
Wherein, VliquidTo ensure the volume of the accumulator's liquid chamber under emergency feathering conditions, Vliquid＝βkAbore△lmaxand/N. Wherein, beta is a safety design system of the volume of the liquid cavity of the energy accumulator, and takes value>1；VhgasVolume of gas chamber of accumulator at maximum working temperature, Vhgas＝VP0Tmax/PsysT0. Wherein, TmaxThe maximum working temperature of the hydraulic variable-pitch mechanism is determined by the actual working condition of the wind turbine generator.
In conjunction with the relationships described above, due to accumulator pre-charge pressure P0And the volume V of the energy accumulator influences the size of the variable-pitch torque provided by the hydraulic variable-pitch mechanism during emergency feathering, so that the pre-charging pressure P of the energy accumulator can be obtained by judging whether the variable-pitch torque provided by the emergency feathering variable-pitch mechanism can envelop the torque of the variable-pitch bearing (namely, the variable-pitch torque provided by the simulation model is required to be larger than the torque of the variable-pitch bearing)0And the feasible value of the accumulator volume V.
The characteristic parameters of the oil pump comprise: oil pump displacement, oil pump motor speed, and oil pump motor power, wherein the hydraulic element selection module 300 may calculate the oil pump displacement using the following equations (3-5):
Vdisp＝Qpump/(. eta.n), equation (3-5)
Wherein, VdispThe oil pump displacement is determined, n is the oil pump motor rotating speed which can be determined by the power supply capacity of the operation site, and eta is the total work of the oil pumpThe coefficient of rate, which is obtained from the oil pump data sheet, Q, taking into account the influence of both mechanical and volumetric efficiencypumpFor maximum flow during operation of the oil pump, Qpump＝zQaAnd z is the number of the proportional directional valves.
The hydraulic component selection module 300 may calculate the oil pump motor power using the following equations (3-6):
Ppoweris the power of the oil pump motor, ttotalFor the total time of the simulation, p (t) is the instantaneous power of the oil pump, wherein,
eta is the total power coefficient of the oil pump.
The response frequency setting module 400 obtains the stiffness of the simulation model and the inertial mass of the variable pitch rotating shaft input by a user, determines the resonance frequency of the simulation model based on the working parameters and the stiffness of the driving element and the inertial mass of the variable pitch rotating shaft, and sets the response frequency of the simulation model to be a frequency smaller than the resonance frequency.
Specifically, to prevent the occurrence of the fatigue damage phenomenon of the hydraulic pitch mechanism due to resonance, the response frequency setting module 400 may design the response frequency of the simulation model of the hydraulic pitch mechanism based on the resonance frequency of the simulation model of the hydraulic pitch mechanism, for example, the response frequency setting module 400 may first determine the resonance frequency of the simulation model of the hydraulic pitch mechanism: the response frequency setting module 400 may calculate the resonant frequency of the hydraulic pitch mechanism using equation (4-1) below:
in equation (4-1), f is the resonance frequency of the hydraulic pitch-variable mechanism, M is the equivalent mass of the hydraulic pitch-variable mechanism, and C is the stiffness of the hydraulic pitch-variable mechanism.
Here, the equivalent mass M of the hydraulic pitch mechanism is determined by equation (4-2):
and m is the inertia mass of the hydraulic variable pitch mechanism around the variable pitch rotating shaft.
Here, the model of the stiffness of the hydraulic pitch mechanism is:
where E is the Young's modulus of the entire mechanism, VboreIs the volume of the rodless cavity of the oil cylinder, VringThe volume of a rod cavity of the oil cylinder is Vbore＝lAbore，Vring＝(△lmax-l)Aring。
After the resonant frequency of the simulation model of the hydraulic variable pitch mechanism is obtained, the response frequency smaller than the resonant frequency can be set according to industry experience so as to protect the use safety of the hydraulic variable pitch mechanism.
The pitch model generation module 500 generates a simulation model of the hydraulic pitch mechanism adapted to the predetermined wind zone based on the operating parameters of the driving elements, the characteristic parameters of the specific hydraulic elements, and the response frequency of the simulation model.
Furthermore, as an additional component, the apparatus may further comprise a condition identification module (not shown in fig. 2), in particular, the condition identification module determines reference data of the simulation model based on the load data, wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed. After determining the reference data, the condition identification module may display the reference data on a user interaction interface for a user to perform subsequent evaluation or guidance, for example, a subsequent control person may set corresponding control data based on the reference data.
Through the device for constructing the hydraulic variable-pitch mechanism, the hydraulic variable-pitch mechanism which meets the preset wind area can be accurately designed, the design and development time is effectively reduced, and the design process is simplified.
FIG. 3 shows a flowchart of a method of building a simulation model of a hydraulic pitch mechanism according to an exemplary embodiment of the invention.
As shown in fig. 3, in step S100, load data at a blade root of a target wind turbine in a predetermined wind zone is obtained, and a pitch bearing torque required by the simulation model to execute a pitch action is determined based on the load data.
Specifically, load data output by the fan design software GH Bladed is read, and the read load data is stored in a data form of a structural body for later recall, where the load data may include a pitch angle, a pitch speed, and a force and moment component borne by a blade root of the simulation model, and the load data may further include other load data used for subsequent control analysis or evaluation, such as a low-full wind speed, a full wind speed, and the like, without limitation.
In step S200, a primary selection parameter of the driving element of the simulation model input by a user is obtained, and a working parameter required for the operation of the driving element of the simulation model is determined based on the load data, the pitch bearing torque and the primary selection parameter.
In the following, in an alternative embodiment, the steps of determining the operating parameters required for the operation of the driving elements of the simulation model according to an exemplary embodiment of the present invention will be described in detail with reference to fig. 4. Fig. 4 shows a flow chart of the steps of determining an operating parameter of a drive element according to an exemplary embodiment of the present invention.
As shown in fig. 4, in step S210, initial parameters of the driving element of the simulation model input by the user are obtained. Here, as an example, the initial parameters are attribute parameters of the driving element input by the user empirically, for example, the initial parameters of the simulation model input by the user may include: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed and system working pressure.
In step S220, an oil cylinder rodless cavity piston area, an oil cylinder rod cavity piston area, a pitch mechanism loading capacity curve, an oil cylinder stroke length, a piston rod movement speed, and a pitch torque that can be provided of the simulation model are calculated based on the pitch angle, the pitch speed, the pitch bearing torque, and the primary selection parameters. Here, the variable pitch mechanism loading capacity curve refers to a curve of cylinder output and variable pitch torque change which can be provided by a hydraulic variable pitch mechanism based on a pitch angle. Specifically, the oil cylinder stroke length can be calculated by utilizing the oil cylinder driving radius, the maximum loading pitch angle and the oil cylinder supporting radius; calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the support radius of the oil cylinder, the maximum loading pitch angle and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed; calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder; calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod; calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder; and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
After the stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided are calculated, in step S231, it is determined whether the calculated stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided can meet corresponding specific requirements, respectively, and working parameters required by the operation of the driving element of the simulation model are determined according to the determination result. As an example, the specific requirement for the stroke length of the oil cylinder means that the stroke length of the oil cylinder of the simulation model needs to be smaller than the distance from the axis of the variable pitch drive disc to the inner wall of the hub; the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod; the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
As an example, if the calculated stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided can all meet the corresponding specific requirements, in step S232, the current initially selected parameters of the driving element, the calculated piston area of the rodless cavity of the cylinder, the piston area of the rod cavity of the cylinder, the loading capacity curve of the pitch mechanism, the stroke length of the cylinder, the movement speed of the piston rod, and the pitch torque that can be provided are set as the working parameters of the driving element of the simulation model.
Furthermore, if at least one of the calculated cylinder forming length, the piston rod movement speed and the pitch torque that can be provided does not meet the respective specific requirements, the step S210 is executed back.
Returning to fig. 4 again, in step S300, predetermined parameters input by a user are obtained, and characteristic parameters of a specific hydraulic component of the simulation model are determined based on the load data, the pitch bearing torque, the working parameters, and the predetermined parameters. Here, the specific hydraulic component includes, as an example: proportional reversing valve, accumulator and oil pump. Specifically, the characteristic parameter of the proportional reversing valve comprises a predetermined outlet flow rate of the proportional reversing valve; the characteristic parameters of the accumulator comprise the volume and the pre-charging pressure of the accumulator; the characteristic parameters of the oil pump comprise: the oil pump displacement, the oil pump motor rotation speed and the oil pump motor power; the predetermined parameters input by the user may include the adiabatic coefficient of the accumulators, the number of accumulators, the minimum operating temperature of the simulation model, the maximum operating temperature of the simulation model, the number of proportional reversing valves, and the total power coefficient of the oil pump.
In step S400, the stiffness of the simulation model and the inertial mass of the variable pitch rotating shaft input by the user are obtained, the resonant frequency of the simulation model is determined based on the working parameters and the stiffness of the driving element and the inertial mass of the variable pitch rotating shaft, and the response frequency of the simulation model is set to be a frequency smaller than the resonant frequency. For example, a response frequency less than the resonant frequency may be set according to industry experience to protect the safety of use of the hydraulic pitch mechanism.
In step S500, a simulation model of the hydraulic pitch mechanism suitable for a preset wind area is generated based on the working parameters of the driving element, the characteristic parameters of the specific hydraulic element and the response frequency of the simulation model.
Furthermore, as an additional step, the method may further comprise the step of obtaining reference data of the simulation model (not shown in fig. 3), in particular, in which the reference data of the simulation model may be determined based on the load data, wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed. In particular, the reference data is then available for subsequent evaluation or guidance by the user, for example, a subsequent control person can set the corresponding control data on the basis of the reference data.
By the method for constructing the hydraulic variable-pitch mechanism, the hydraulic variable-pitch mechanism which meets the preset wind area can be accurately designed, the design and development time is effectively reduced, and the design process is simplified.
There is also provided, in accordance with an exemplary embodiment of the present invention, a computer-readable storage medium storing a computer program. The computer readable storage medium stores a computer program which, when executed by a processor, causes the processor to perform the method of constructing a simulation model of a hydraulic pitch mechanism as described above. The computer readable recording medium is any data storage device that can store data read by a computer system. Examples of the computer-readable recording medium include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
There is also provided, in accordance with an exemplary embodiment of the present invention, a computing device. The computing device includes a processor and a memory. The memory is for storing a computer program. The computer program is executed by a processor such that the processor performs the method of constructing a simulation model of a hydraulic pitch mechanism as described above.
By adopting the device and the method for constructing the simulation model of the hydraulic variable-pitch mechanism, which are disclosed by the exemplary embodiment of the invention, the hydraulic variable-pitch mechanism which accords with the preset wind area can be accurately designed, the design and development time is effectively reduced, the design flow is simplified, and the designed hydraulic variable-pitch mechanism model is simple to operate, high in visualization degree and good in expansibility.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (24)
1. An apparatus for constructing a simulation model of a hydraulic pitch mechanism, the apparatus comprising:
the load data processing module is used for acquiring load data at the blade root of a target wind turbine generator in a preset wind area and determining the variable-pitch bearing torque required by the simulation model to execute the variable-pitch action based on the load data;
the variable pitch mechanism design module is used for acquiring the initial selection parameters of the driving element of the simulation model input by a user and determining the working parameters required by the operation of the driving element of the simulation model based on the load data, the variable pitch bearing torque and the initial selection parameters;
the hydraulic component model selection module is used for acquiring preset parameters input by a user and determining characteristic parameters of a specific hydraulic component of the simulation model based on load data, variable-pitch bearing torque, working parameters and the preset parameters;
the response frequency setting module is used for acquiring the Young modulus of the simulation model and the inertia mass of the variable-pitch rotating shaft input by a user, determining the resonance frequency of the simulation model based on the working parameters of the driving element, the Young modulus and the inertia mass of the variable-pitch rotating shaft, and setting the response frequency of the simulation model to be less than the resonance frequency;
and the variable pitch model generation module is used for generating a simulation model of the hydraulic variable pitch mechanism suitable for the preset wind area based on the working parameters of the driving element, the characteristic parameters of the specific hydraulic element and the response frequency of the simulation model.
2. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 1, wherein the load data processing module stores the load data in the form of data of a structure.
3. The apparatus for constructing a simulation model of a hydraulic pitch mechanism of claim 1, wherein the load data comprises: and the pitch angle, the pitch changing speed and the force and moment components borne by the blade root of the simulation model.
4. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 3, wherein the initial parameters of the simulation model comprise: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed, system working pressure and the number of driven oil cylinders.
5. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 4, wherein the pitch mechanism design module comprises:
the initial selection parameter acquisition module is used for acquiring initial selection parameters of the driving element of the simulation model input by a user;
the working parameter calculation module is used for calculating the oil cylinder rodless cavity piston area, the oil cylinder rod cavity piston area, a variable pitch mechanism loading capacity curve, the oil cylinder stroke length, the piston rod movement speed and the variable pitch torque which can be provided by the simulation model on the basis of the pitch angle, the variable pitch speed, the variable pitch bearing torque and the primary selection parameters;
and the working parameter determining module is used for respectively judging whether the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided can meet corresponding specific requirements or not, and determining working parameters required by the operation of the driving element of the simulation model according to the judgment result.
6. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 5, wherein the operating parameter determination module performs the following operations:
if the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided can meet corresponding specific requirements, setting the current primary selection parameters of the driving element, the calculated piston area of the rodless cavity of the oil cylinder, the piston area of the rod cavity of the oil cylinder, the loading capacity curve of the pitch-variable mechanism, the stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided as working parameters of the driving element of the simulation model;
and if at least one of the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch variation torque which can be provided does not meet the corresponding specific requirement, repeating the operation of the initial selection parameter acquisition module, the operation parameter calculation module and the operation parameter determination module by acquiring the initial selection parameters of the driving element again.
7. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 5, wherein the operating parameter calculation module performs the following operations:
calculating the stroke length of the oil cylinder by using the driving radius of the oil cylinder, the maximum loading pitch angle and the support radius of the oil cylinder;
calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the maximum loading pitch angle, the support radius of the oil cylinder and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed;
calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder;
calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod;
calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder;
and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
8. The device for constructing the simulation model of the hydraulic pitch-changing mechanism according to claim 5, wherein the specific requirement for the stroke length of the oil cylinder means that the stroke length of the oil cylinder of the simulation model is required to be smaller than the distance from the axle center of the pitch-changing driving disc to the inner wall of the hub;
the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod;
the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
9. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 1, wherein the specific hydraulic component includes: proportional reversing valve, accumulator and oil pump.
10. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 9, wherein the characteristic parameter of the proportional reversing valve comprises a predetermined outlet flow of the proportional reversing valve,
the characteristic parameters of the accumulator include the volume and the pre-charge pressure of the accumulator,
the characteristic parameters of the oil pump comprise: oil pump displacement, oil pump motor speed and oil pump motor power.
11. The apparatus for constructing a simulation model of a hydraulic pitch mechanism according to claim 1, further comprising:
a condition identification module for determining reference data of the simulation model based on the load data for subsequent evaluation or guidance by a user,
wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed.
12. A method for constructing a simulation model of a hydraulic pitch mechanism, the method comprising:
(A) load data of a blade root of a target wind turbine generator in a preset wind area are obtained, and variable-pitch bearing torque required by the simulation model for executing variable-pitch action is determined based on the load data;
(B) acquiring initial selection parameters of a driving element of the simulation model input by a user, and determining working parameters required by the operation of the driving element of the simulation model based on load data, variable pitch bearing torque and the initial selection parameters;
(C) acquiring preset parameters input by a user, and determining characteristic parameters of a specific hydraulic element of the simulation model based on load data, variable-pitch bearing torque, working parameters and the preset parameters;
(D) acquiring the Young modulus of the simulation model and the inertia mass of the variable-pitch rotating shaft input by a user, determining the resonance frequency of the simulation model based on the working parameters of the driving element, the Young modulus and the inertia mass of the variable-pitch rotating shaft, and setting the response frequency of the simulation model to be less than the resonance frequency;
(E) and generating a simulation model of the hydraulic variable pitch mechanism suitable for the preset wind area based on the working parameters of the driving element, the characteristic parameters of the specific hydraulic element and the response frequency of the simulation model.
13. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 12, wherein step (a) further comprises: and storing the load data in a data form of a structural body.
14. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 12, wherein the load data comprises: and the pitch angle, the pitch changing speed and the force and moment components borne by the blade root of the simulation model.
15. The method for constructing a simulation model of a hydraulic pitch mechanism according to claim 14, wherein the initial parameters of the simulation model include: the simulation model comprises an oil cylinder driving radius, an oil cylinder supporting radius, a maximum loading pitch angle, an oil cylinder rodless cavity piston diameter, a piston rod moving speed, system working pressure and the number of driven oil cylinders.
16. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 15, wherein step (B) comprises:
(B1) acquiring initial selection parameters of a driving element of the simulation model input by a user;
(B2) determining the piston area of an oil cylinder rodless cavity, the piston area of an oil cylinder rod cavity, a variable pitch mechanism loading capacity curve, the oil cylinder stroke length, the piston rod movement speed and the variable pitch torque which can be provided of the simulation model based on the pitch angle, the variable pitch speed, the variable pitch bearing torque and the primary selection parameters;
(B3) and respectively judging whether the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the variable pitch torque which can be provided can meet corresponding specific requirements, and determining working parameters required by the operation of a driving element of the simulation model according to the judgment result.
17. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 16, wherein step (B3) includes:
if the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided can meet corresponding specific requirements, setting the current primary selection parameters of the driving element, the calculated piston area of the rodless cavity of the oil cylinder, the piston area of the rod cavity of the oil cylinder, the loading capacity curve of the pitch-variable mechanism, the stroke length of the oil cylinder, the movement speed of the piston rod and the pitch-variable torque which can be provided as working parameters of the driving element of the simulation model;
and if at least one of the calculated stroke length of the oil cylinder, the movement speed of the piston rod and the pitch torque which can be provided does not meet the corresponding specific requirement, repeatedly executing the step (B1), the step (B2) and the step (B3) by re-acquiring the initial selection parameters of the driving element.
18. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 16, wherein step (B2) includes:
calculating the stroke length of the oil cylinder by using the driving radius of the oil cylinder, the maximum loading pitch angle and the support radius of the oil cylinder;
calculating a variable pitch drive power arm by using the stroke length of the oil cylinder, the maximum loading pitch angle, the support radius of the oil cylinder and the drive radius of the oil cylinder, and determining the movement speed of the piston rod by using the variable pitch drive power arm and the variable pitch speed;
calculating the area of the piston of the rodless cavity of the oil cylinder by utilizing the diameter of the piston of the rodless cavity of the oil cylinder;
calculating the area of the piston rod of the oil cylinder by utilizing the diameter of the piston rod;
calculating the piston area of the rod cavity of the oil cylinder by utilizing the piston area of the rodless cavity of the oil cylinder and the piston rod area of the oil cylinder;
and calculating the variable pitch torque which can be provided by the simulation model by using the system working pressure, the area of the rodless cavity piston of the oil cylinder, the area of the rod cavity piston of the oil cylinder and the variable pitch driving force arm.
19. The method for constructing a simulation model of a hydraulic pitch mechanism according to claim 16, wherein the specific requirement for the stroke length of the cylinder means that the stroke length of the cylinder of the simulation model needs to be smaller than the distance from the axis of the pitch drive disc to the inner wall of the hub;
the specific requirement for the motion speed of the piston rod means that the motion speed of the piston rod of the simulation model needs to be smaller than a specific value of the motion speed of the piston rod;
the specific requirement for the pitch torque that can be provided means that the pitch torque provided by the simulation model needs to be greater than the pitch bearing torque.
20. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 12, wherein the specific hydraulic component comprises: proportional reversing valve, accumulator and oil pump.
21. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 20, wherein the characteristic parameter of the proportional reversing valve comprises a predetermined outlet flow of the proportional reversing valve,
the characteristic parameters of the accumulator include the volume and the pre-charge pressure of the accumulator,
the characteristic parameters of the oil pump comprise: oil pump displacement, oil pump motor speed and oil pump motor power.
22. The method of constructing a simulation model of a hydraulic pitch mechanism of claim 12, further comprising:
(F) determining reference data for the simulation model based on the load data for subsequent evaluation or guidance by a user,
wherein the reference data of the simulation model comprises: the time ratio of the incomplete wind speed to the complete wind speed, the distribution range of the pitch angles, the occurrence frequency of the designated variable pitch speed under the limit load working condition and the duration of the variable pitch speed.
23. A computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of any one of claims 12 to 22.
24. A computing device, the computing device comprising:
a processor;
memory storing a computer program which, when executed by the processor, implements the method of any one of claims 12 to 22.
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| CN113027676B (en) * | 2019-12-25 | 2022-10-04 | 新疆金风科技股份有限公司 | Hydraulic variable pitch control method and device of wind generating set |
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