阅读说明：本技术 一种风力发电机组变桨滑环的选型方法及装置 (Model selection method and device for variable-pitch slip ring of wind generating set ) 是由 耿丽红 高亚春 王朝东 谢金娟 武愈振 杨海锋 王建伟 石磊 李松博 于 2019-09-18 设计创作，主要内容包括：本发明涉及一种风力发电机组变桨滑环的选型方法及装置,包括：建立风机仿真模型,并按照风机设定运行工况进行仿真,获取风机变桨系统的时序载荷；根据风机变桨系统的时序载荷计算变桨电机的额定驱动扭矩和峰值驱动扭矩；根据变桨电机额定驱动扭矩、峰值驱动扭矩以及变桨电机的等效转速分别计算所有变桨电机所消耗的等效额定功率和等效峰值功率；根据所有变桨电机所消耗的等效额定功率和等效峰值功率,计算变桨滑环侧等效额定电流和峰值电流；并根据变桨滑环侧等效额定电流和峰值电流,选定变桨滑环。本发明可以实现变桨滑环的准确选型,有利于降低系统故障率,延长变桨滑环的使用寿命,保证了变桨系统安全可靠运行。(The invention relates to a model selection method and a device for a variable-pitch slip ring of a wind generating set, comprising the following steps of: establishing a fan simulation model, and simulating according to the set operation condition of the fan to obtain the time sequence load of a fan variable pitch system; calculating rated driving torque and peak driving torque of a variable pitch motor according to time sequence load of a variable pitch system of the fan; respectively calculating equivalent rated power and equivalent peak power consumed by all the variable pitch motors according to the rated driving torque, the peak driving torque and the equivalent rotating speed of the variable pitch motors; calculating equivalent rated current and peak current of the variable pitch slip ring side according to equivalent rated power and equivalent peak power consumed by all variable pitch motors; and selecting the variable-pitch slip ring according to the equivalent rated current and the peak current of the variable-pitch slip ring side. The invention can realize accurate type selection of the variable-pitch slip ring, is beneficial to reducing the fault rate of the system, prolongs the service life of the variable-pitch slip ring and ensures the safe and reliable operation of the variable-pitch system.)

1. A model selection method for a variable-pitch slip ring of a wind generating set is characterized by comprising the following steps:

establishing a fan simulation model, simulating according to a set operating condition of a fan, and acquiring a time sequence load of a fan variable pitch system, wherein the time sequence load of the fan variable pitch system comprises a blade root moment, an overturning moment, an axial force, a radial resultant force and an acceleration in a variable pitch process;

calculating rated driving torque and peak driving torque of a variable pitch motor according to time sequence load of a variable pitch system of the fan;

respectively calculating equivalent rated power and equivalent peak power consumed by all the variable pitch motors according to the rated driving torque and the peak driving torque of the variable pitch motors and the equivalent rotating speed of the variable pitch motors;

calculating equivalent rated current and peak current of the variable pitch slip ring side according to equivalent rated power and equivalent peak power consumed by all variable pitch motors; and selecting the variable-pitch slip ring according to the equivalent rated current and the peak current of the variable-pitch slip ring side.

2. The model selection method for the variable pitch slip ring of the wind generating set according to claim 1, wherein the process of calculating the rated driving torque and the peak driving torque of the variable pitch motor according to the time sequence load of the variable pitch system of the wind turbine is as follows: calculating the friction torque of a variable-pitch bearing according to the overturning moment, the axial force and the radial resultant force of the variable-pitch system of the fan; calculating the driving torque of a variable pitch motor according to the friction torque of the variable pitch bearing, the blade root torque and the acceleration in the variable pitch process; and calculating the rated driving torque and the peak driving torque of the variable pitch motor according to the driving torque of the variable pitch motor.

3. The type selection method of the wind generating set variable pitch slip ring according to claim 1 or 2, characterized in that the equivalent rotating speed of the variable pitch motor is calculated according to the designed maximum variable pitch speed of the fan variable pitch system and the transmission ratio of the reduction gearbox of the variable pitch system.

4. The model selection method for the variable pitch slip ring of the wind generating set according to claim 3, wherein the calculation formula of the equivalent rotating speed of the variable pitch motor is as follows:

wherein, ω is_motorFor equivalent rotation speed of a variable pitch motor, beta' is the maximum pitch rate designed by a fan pitch system, i_gbxThe transmission ratio of a reduction gearbox of the variable pitch system.

5. The type selection method for the pitch slip ring of the wind generating set according to claim 1 or 2, wherein the calculation formula of the equivalent rated power and the equivalent peak power consumed by all pitch motors is as follows:

wherein, P_3rate、P_3peakRespectively the equivalent rated power and the equivalent peak power, M, consumed by all the variable-pitch motors_{act_rate}、M_{act_max}Rated driving torque and peak driving torque, omega, of the variable pitch motor respectively_motorThe equivalent rotating speed of the variable pitch motor.

6. The type selection method for the pitch slip ring of the wind generating set according to claim 1 or 2, characterized in that the calculation formula of the equivalent rated current and the peak current at the pitch slip ring side is as follows:

wherein, I_rate、I_peakRespectively the equivalent rated current and the peak current, P, of the variable-pitch slip ring side_3rate、P_3peakRespectively the equivalent rated power and the equivalent peak power, P, consumed by all the variable-pitch motors_lossFor losses in the variable pitch drive system, U is the slip ring side rated voltage,is the total power factor of the pitch system.

7. The model selection method for the pitch slip ring of the wind generating set according to claim 2, wherein the calculation formula of the friction torque of the pitch bearing is as follows:

wherein M is_fricIs the friction torque of the variable-pitch bearing, mu is the friction coefficient of the variable-pitch bearing, M_xyFor overturning moment, F_ZAs an axial force, D_LDiameter of bearing race, F_xyFor a resultant radial force, M_prePre-tightening the bearing roller path.

8. The model selection method for the pitch slip ring of the wind generating set according to claim 2, wherein the calculation formula of the driving torque of the pitch motor is as follows:

M_act＝(ABS(M_Z)+M_{fric_max}+M_acc)/(i_teeth*η_teeth*i_gbx*η_gbx)

wherein M is_actFor the driving torque of the pitch motor, ABS () is the absolute value function, M_ZAs root moment, M_fric__maxFor maximum friction torque of pitch bearing, M_fric__max＝K_max*M_fric，K_maxIs friction coefficient, and has a value range of 1-1.25, M_fricFor the friction torque of pitch bearings, M_accFor moment of inertia of pitch bearing, M_acc＝J*α_accJ is equivalent moment of inertia of the pitch system, alpha_accFor acceleration during pitch variation, i_teethIs the number of the small teeth of the variable pitch propeller, eta_teethFor the efficiency of the pitch-setting pinion drive, i_gbxFor the transmission ratio of the reduction gearbox, eta_gbxThe transmission efficiency of the reduction gearbox is improved.

9. The model selection method for the pitch slip ring of the wind generating set according to claim 2, wherein the calculation formulas of the rated driving torque and the peak driving torque of the pitch motor are as follows:

wherein M is_{act_rate}、M_{act_max}Rated driving torque and peak driving torque of a variable pitch motor respectively, wherein RMS is root mean square, M_actFor the driving torque of the pitch motor max () is the function of the maximum value, i_teethIs the number of the small teeth of the variable pitch propeller, eta_teethFor the efficiency of the pitch-setting pinion drive, i_gbxFor the transmission ratio of the reduction gearbox, eta_gbxThe transmission efficiency of the reduction gearbox is improved.

10. A device for type selection of a wind generating set pitch slip ring, characterized by comprising a processor and a memory, wherein the processor is used for processing instructions stored in the memory to realize the method for type selection of the wind generating set pitch slip ring according to any one of claims 1-9.

Technical Field

The invention relates to a model selection method and device for a variable-pitch slip ring of a wind generating set, and belongs to the technical field of wind power generation.

Background

The variable pitch system of the wind generating set is an important component of a complete machine control system, the structural schematic diagram of the variable pitch system is shown in fig. 1, the variable pitch system mainly comprises three variable pitch cabinets and three variable pitch motors, the variable pitch system receives a pitch angle instruction issued by a main control system through a variable pitch slip ring, and corresponding variable pitch is executed through a variable pitch executing mechanism.

The variable-pitch slip ring is a key component for connecting the master control system and the variable-pitch system, and directly influences the transmission of power and communication signals of the master control system and the variable-pitch system. According to statistics, the pitch fault of the variable pitch unit generally accounts for about 40% of the total fault of the unit, and the fault generated by the pitch slip ring accounts for about 50% of the total fault of the unit. Therefore, the reliability of the variable-pitch slip ring plays a vital role in the stability of the unit, and whether the type selection of the variable-pitch slip ring is reasonable or not determines whether the variable-pitch slip ring can work reliably or not. The model selection of the variable-pitch slip ring mainly considers the rated capacity and the peak capacity of the slip ring, while the model selection mode of the existing variable-pitch slip ring is generally selected according to experience without considering key factors influencing the rated capacity and the peak capacity, the calculation process is rough, the calculation result is not accurate enough, the phenomenon of inaccurate model selection exists, and the safe and reliable operation of a variable-pitch system is influenced.

Disclosure of Invention

The invention aims to provide a model selection method and a model selection device for a variable-pitch slip ring of a wind generating set, which are used for solving the problem that the safe and reliable operation of a variable-pitch system is influenced due to inaccurate model selection of the variable-pitch slip ring.

In order to solve the technical problem, the invention provides a type selection method of a variable-pitch slip ring of a wind generating set, which comprises the following steps:

establishing a fan simulation model, simulating according to a set operating condition of a fan, and acquiring a time sequence load of a fan variable pitch system, wherein the time sequence load of the fan variable pitch system comprises a blade root moment, an overturning moment, an axial force, a radial resultant force and an acceleration in a variable pitch process;

calculating rated driving torque and peak driving torque of a variable pitch motor according to time sequence load of a variable pitch system of the fan;

respectively calculating equivalent rated power and equivalent peak power consumed by all the variable pitch motors according to the rated driving torque and the peak driving torque of the variable pitch motors and the equivalent rotating speed of the variable pitch motors;

calculating equivalent rated current and peak current of the variable pitch slip ring side according to equivalent rated power and equivalent peak power consumed by all variable pitch motors; and selecting the variable-pitch slip ring according to the equivalent rated current and the peak current of the variable-pitch slip ring side.

In order to solve the technical problem, the invention further provides a model selection device of the wind generating set variable pitch slip ring, which comprises a processor and a memory, wherein the processor is used for processing the instructions stored in the memory so as to realize the model selection method of the wind generating set variable pitch slip ring.

The invention has the beneficial effects that: by establishing a fan simulation model and simulating according to the set operation condition of the fan, the equivalent rated current and the peak current of the variable pitch slip ring side are accurately calculated according to the load of the variable pitch slip ring, namely the working condition of the whole variable pitch system, so that the accurate model selection of the variable pitch slip ring is realized, the system fault rate is favorably reduced, the service life of the variable pitch slip ring is prolonged, and the safe and reliable operation of the variable pitch system is ensured.

As a further improvement of the method and the device, in order to accurately calculate the rated driving torque and the peak driving torque of the variable pitch motor, the process of calculating the rated driving torque and the peak driving torque of the variable pitch motor according to the time sequence load of the variable pitch system of the fan comprises the following steps: calculating the friction torque of a variable-pitch bearing according to the overturning moment, the axial force and the radial resultant force of the variable-pitch system of the fan; calculating the driving torque of a variable pitch motor according to the friction torque of the variable pitch bearing, the blade root torque and the acceleration in the variable pitch process; and calculating the rated driving torque and the peak driving torque of the variable pitch motor according to the driving torque of the variable pitch motor.

As a further improvement of the method and the device, in order to accurately obtain the equivalent rotating speed of the variable pitch motor, the equivalent rotating speed of the variable pitch motor is calculated according to the maximum variable pitch speed designed by the variable pitch system of the fan and the transmission ratio of the reduction gearbox of the variable pitch system.

As a further improvement of the method and the device, in order to accurately obtain the equivalent rotating speed of the variable pitch motor, the calculation formula of the equivalent rotating speed of the variable pitch motor is as follows:

wherein, ω is_motorFor equivalent rotation speed of a variable pitch motor, beta' is the maximum pitch rate designed by a fan pitch system, i_gbxThe transmission ratio of a reduction gearbox of the variable pitch system.

As a further improvement of the method and the device, in order to accurately obtain the equivalent rated power and the equivalent peak power of the load of the variable pitch slip ring, the calculation formulas of the equivalent rated power and the equivalent peak power consumed by all variable pitch motors are as follows:

wherein, P_3rate、P_3peakRespectively the equivalent rated power and the equivalent peak power, M, consumed by all the variable-pitch motors_{act_rate}、M_{act_max}Rated driving torque and peak driving torque, omega, of the variable pitch motor respectively_motorThe equivalent rotating speed of the variable pitch motor.

As a further improvement of the method and the device, in order to accurately obtain the equivalent rated current and the peak current of the variable pitch slip ring side to determine the model of the variable pitch slip ring, the calculation formula of the equivalent rated current and the peak current of the variable pitch slip ring side is as follows:

wherein, I_rate、I_peakRespectively the equivalent rated current and the peak current, P, of the variable-pitch slip ring side_3rate、P_3peakRespectively the equivalent rated power and the equivalent peak power, P, consumed by all the variable-pitch motors_lossFor losses in the variable pitch drive system, U is the slip ring side rated voltage,is the total power factor of the pitch system.

As a further improvement of the method and the device, in order to accurately calculate the friction torque of the variable-pitch bearing, the calculation formula of the friction torque of the variable-pitch bearing is as follows:

wherein M is_fricIs the friction torque of the variable-pitch bearing, mu is the friction coefficient of the variable-pitch bearing, M_xyFor overturning moment, F_ZAs an axial force, D_LDiameter of bearing race, F_xyFor a resultant radial force, M_prePre-tightening the bearing roller path.

As a further improvement of the method and the device, in order to accurately calculate the driving torque of the pitch motor, the calculation formula of the driving torque of the pitch motor is as follows:

M_act＝(ABS(M_Z)+M_{fric_max}+M_acc)/(i_teeth*η_teeth*i_gbx*η_gbx)

wherein M is_actFor the driving torque of the pitch motor, ABS () is the absolute value function, M_ZAs root moment, M_{fric_max}For maximum friction torque of pitch bearing, M_{fric_max}＝K_max*M_fric，K_maxIs friction coefficient, and has a value range of 1-1.25, M_fricFor the friction torque of pitch bearings, M_accFor moment of inertia of pitch bearing, M_acc＝J*α_accJ is equivalent moment of inertia of the pitch system, alpha_accFor acceleration during pitch variation, i_teethIs the number of the small teeth of the variable pitch propeller, eta_teethFor the efficiency of the pitch-setting pinion drive, i_gbxFor the transmission ratio of the reduction gearbox, eta_gbxThe transmission efficiency of the reduction gearbox is improved.

As a further improvement of the method and the device, in order to accurately calculate the rated driving torque and the peak driving torque of the variable pitch motor, the calculation formulas of the rated driving torque and the peak driving torque of the variable pitch motor are as follows:

wherein M is_{act_rate}、M_{act_max}Rated driving torque and peak driving torque of a variable pitch motor respectively, wherein RMS is root mean square, M_actFor the driving torque of the pitch motor max () is the function of the maximum value, i_teethIs the number of the small teeth of the variable pitch propeller, eta_teethFor the efficiency of the pitch-setting pinion drive, i_gbxFor the transmission ratio of the reduction gearbox, eta_gbxThe transmission efficiency of the reduction gearbox is improved.

Drawings

FIG. 1 is a schematic diagram of a prior art pitch system configuration;

FIG. 2 is a flow chart of a type selection method of a variable pitch slip ring of a wind generating set.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The embodiment of the model selection method of the variable-pitch slip ring of the wind generating set comprises the following steps:

the embodiment provides a model selection method for a variable-pitch slip ring of a wind generating set, the reasonable variable-pitch slip ring can be selected through the method, the safety and the reliability of the set are high, the system fault rate is favorably reduced, the manufacturing cost of a fan is reduced, and the service life of the variable-pitch slip ring is prolonged. The flow chart corresponding to the model selection method of the variable-pitch slip ring of the wind generating set is shown in FIG. 2, and specifically comprises the following steps:

(1) and establishing a fan simulation model, and simulating according to the set operating condition of the fan to obtain the time sequence load of the fan variable pitch system.

The fan model used in this embodiment is a Bladed simulation model that can perform fan stress analysis and statistical calculation. The set operation conditions of the fan are set according to GL specifications, namely general specifications in the wind driven generator industry, more than 1400 fan operation conditions of 9 types including power generation, fault, start, normal stop, emergency stop, idling and the like are specified in great detail by the GL specifications, the working conditions cover the possible working conditions in the fan operation life, and the main working conditions and the secondary working conditions are not distinguished. And when the fan is subjected to simulation calculation, all the operation conditions are set and calculated one by one according to the specification.

Setting all fan parameters such as a wind wheel, a transmission, a tower drum, a generator and the like in a blanked software, building a fan model, setting working conditions according to GL regulations, operating the software, extracting and counting calculation results (simulation calculation is carried out according to time, and different time lengths are set under different working conditions), and analyzing and processing the calculation results according to requirements to obtain the required time sequence load. The obtained time sequence load of the fan variable pitch system comprises blade root moment M_ZOverturning moment M_xyAxial force F_ZResultant radial force F_xyAnd acceleration alpha in the process of pitch variation_acc。

(2) According to the overturning moment M of the fan variable pitch system_xyAxial force F_ZAnd resultant radial force F_xyCalculating the friction torque M of the pitch bearing_fricThe corresponding calculation formula is:

wherein mu is the friction coefficient of the variable-pitch bearing, D_LDiameter of bearing race, F_xyFor a resultant radial force, M_prePre-tightening the bearing roller path.

(3) According to the friction torque M of the variable-pitch bearing_fricBlade root moment M_ZAnd acceleration alpha in the process of pitch variation_accCalculating the driving torque M of the variable pitch motor_actThe calculation formula should be:

M_act＝(ABS(M_Z)+M_{fric_max}+M_acc)/(i_teeth*η_teeth*i_gbx*η_gbx)

wherein ABS () is the absolute value function, M_ZAs root moment, M_{fric_max}For maximum friction torque of pitch bearing, M_{fric_max}＝K_max*M_fric，K_maxThe coefficient of friction is 1-1.25, and the inertia moment of the variable-pitch bearing is M_acc＝J*α_accJ is equivalent moment of inertia of the pitch system, i_teethIs the number of the small teeth of the variable pitch propeller, eta_teethFor the efficiency of the pitch-setting pinion drive, i_gbxFor the transmission ratio of the reduction gearbox, eta_gbxThe transmission efficiency of the reduction gearbox is improved.

(4) According to the driving torque M of a variable-pitch motor_actCalculating the rated driving torque M of the variable pitch motor_{act_rate}And peak drive torque M_{act_max}The corresponding calculation formula is:

wherein RMS is the root mean square, and max () is the function for maximum.

(5) According to the rated driving torque M of a variable-pitch motor_{act_rate}And peak drive torque M_{act_max}And respectively calculating equivalent rated power P consumed by all the variable pitch motors at the equivalent rotating speed of the variable pitch motors_3rateAnd equivalent peak power P_3peak。

Wherein, the maximum pitch rate beta' designed according to the fan pitch system and the transmission ratio i of the reduction gearbox of the pitch system_gbxCalculating the equivalent rotating speed omega of the variable pitch motor_motorThe corresponding calculation formula is:

at the moment, all the variable pitch motors (3 variable pitch motors) consume equivalent rated power P_3rateAnd equivalent peak power P_3peakThe calculation formula of (2) is as follows:

(6) according to the equivalent rated power and the equivalent peak power consumed by all the variable-pitch motors, calculating the equivalent rated current I of the variable-pitch slip ring side by using an alternating current three-phase power calculation method and considering factors such as loss, power factor and the like_rateAnd peak current I_peak(ii) a And according to the equivalent rated current I of the variable-pitch slip ring side_rateAnd peak current I_peakAnd selecting the variable-pitch slip ring.

The calculation formula of the equivalent rated current and the peak current of the variable pitch slip ring side is as follows:

in the above formula, P_lossFor losses in the variable pitch drive system, U is the slip ring side rated voltage,is the total power factor of the pitch system.

Of course, when the error is allowable, as another embodiment, in step (6), the equivalent rated current and the peak current of the pitch slip ring side, that is, the rated capacity and the peak capacity of the slip ring, may also be obtained by only considering the power factor and not considering the loss in the pitch drive system, so as to determine the model of the pitch slip ring. Since the process of determining the model of the variable-pitch slip ring according to the rated capacity and the peak capacity of the slip ring belongs to the prior art, the details are not repeated here.

The method for selecting the type of the variable-pitch slip ring of the wind generating set is simple in principle, the effective capacity value of the slip ring is accurately calculated according to the working condition of the load (the whole variable-pitch system) carried by the variable-pitch slip ring by establishing the fan simulation model, the appropriate and matched variable-pitch slip ring is selected on the premise of ensuring the safe and reliable operation of the variable-pitch system, the fault condition of the variable-pitch system is effectively reduced, and the design cost of the wind generating set is reduced.

The embodiment of the model selection device of the variable-pitch slip ring of the wind generating set comprises the following steps:

the embodiment provides a type selection device of a wind generating set variable pitch slip ring, which comprises a processor and a memory, wherein the processor is used for processing instructions stored in the memory so as to realize the type selection method of the wind generating set variable pitch slip ring. For those skilled in the art, according to the above method for selecting the type of the variable pitch slip ring of the wind generating set, a corresponding computer instruction is obtained to obtain the device for selecting the type of the variable pitch slip ring of the wind generating set. Since the model selection method of the pitch slip ring of the wind generating set has been described in detail in the above embodiments of the model selection method of the pitch slip ring of the wind generating set, the details are not described here.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present application, various changes, modifications or equivalents of the embodiments of the present application can be made, and these changes, modifications or equivalents are within the protection scope of the claims of the present invention.