CN110460098B - Wind turbine dual-mass-block shafting stability control method based on virtual mass block - Google Patents

Wind turbine dual-mass-block shafting stability control method based on virtual mass block Download PDF

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CN110460098B
CN110460098B CN201910799947.6A CN201910799947A CN110460098B CN 110460098 B CN110460098 B CN 110460098B CN 201910799947 A CN201910799947 A CN 201910799947A CN 110460098 B CN110460098 B CN 110460098B
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wind turbine
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shafting
generator
mass
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CN110460098A (en
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张祥宇
朱正振
付媛
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North China Electric Power University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines

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Abstract

The invention discloses a wind turbine dual-mass-block shafting stability control method based on a virtual mass block, which comprises the following steps of: monitoring the angular speed of the wind driven generator; judging whether the shafting part of the wind turbine generator is disturbed or not; judging whether the wind turbine is in a maximum power operation area according to the operation angular speed of the wind wheel of the wind turbine, and correspondingly setting the pitch angle of the wind turbine: and judging whether the angular speed of the wind driven generator enters an allowable fluctuation range or not. According to the virtual mass block-based stability control method for the double-mass shafting of the wind turbine, the mechanical power output by the wind turbine generator is changed by adjusting the pitch angle of the wind turbine generator, the unbalanced power formed by the two-mass model wind turbine generator in the dynamic process can be reduced, the interference tolerance of the flexible connecting part of the shafting of the wind turbine generator is improved, and the shafting oscillation stability of the wind turbine generator in the process of system disturbance and large-amplitude power adjustment is ensured.

Description

Wind turbine dual-mass-block shafting stability control method based on virtual mass block
Technical Field
The invention relates to the technical field of wind power grid connection, in particular to a virtual mass block-based stability control method for a double-mass-block shafting of a wind turbine.
Background
With the increasing of the access proportion of new energy, many scholars at home and abroad research the friendly grid-connected control function of the new energy in various forms, and in order to improve the stable operation characteristic of a power system after wind power is accessed into a system, a novel power controller attached to a wind power grid-connected inverter is widely concerned. However, the power controller improves the system operation performance, and simultaneously fluctuates along with the large-amplitude output characteristic of the wind turbine generator, for the wind turbine generator, large-range power change can impact the flexible shaft of the wind turbine generator, even cause rotating speed oscillation instability, and endanger the safe operation of the wind turbine generator. The traditional rotating speed feedforward compensation term added on the maximum power tracking control of the wind turbine generator is used for actively damping shafting torsional vibration, but the dynamic stability of the system is also adversely affected by improper setting of the shafting stability control coefficient. Therefore, the power of the wind turbine generator is adjusted in a dynamic process, so that reliable damping of the flexible connecting shaft of the wind turbine generator is ensured, and risks of various optimization controllers in actual popularization and application are further avoided. The stable operation capability of the grid-connected wind turbine generator is improved, and the key for realizing the high-proportion renewable energy source friendly grid-connected function is realized.
Disclosure of Invention
The invention aims to provide a virtual mass block-based stable control method for a double-mass shafting of a wind turbine, which can reduce unbalanced power formed by a two-mass model wind turbine generator in a dynamic process by adjusting the pitch angle of a wind turbine generator to change the output mechanical power, improve the interference tolerance of a flexible connecting part of the shafting of the wind turbine generator, and ensure the stable shafting oscillation of the wind turbine generator in the process of system disturbance and large-amplitude power adjustment.
In order to achieve the purpose, the invention provides the following scheme:
a wind turbine double-mass-block shafting stability control method based on virtual mass blocks comprises the following steps:
step 1: based on a virtual mass block technology, establishing a double-mass-block shafting model of the wind turbine, converting wind power absorbed by the wind turbine into mechanical torque, and inputting the mechanical torque to a rotating shaft of a rotor of the wind driven generator;
step 2: monitoring angular velocity ω of wind turbineg；
And step 3: judging whether the shafting part of the wind turbine generator is disturbed or not, namely, judging omegagFrom the initial angular velocity omegag0Difference | ω ofg-ωg0Whether | is greater than the critical stability threshold ωcIf so, judging that the shafting part of the wind turbine generator is disturbed, and turning to the step 4, otherwise, turning to the step 2;
and 4, step 4: according to the wind wheel operating angular velocity omega of the wind machinerJudging whether the wind turbine generator is in the maximum power operation area or not when the wind turbine generator is in the maximum power operation arearAt the cut-in electrical angular velocity ω0And the electrical angular velocity omega when entering the constant rotation speed region1In between, it means that the wind turbine is at the maximumPower operation zone, when the pitch angle of the wind turbine is set to beta according to equation (1)1The following are:
Figure GDA0002664917610000021
otherwise, the pitch angle of the wind turbine is set to β according to equation (2)0The following are:
Figure GDA0002664917610000022
where λ is tip speed ratio, λ ═ R ωrV,/v; r is the radius of the wind wheel, and v is the wind speed; cPmaxThe maximum wind energy utilization coefficient; Δ ωrThe rotor angular speed deviation of the wind wheel of the wind turbine is obtained; hr_vicRepresenting the virtual mass control coefficient, Pr0The initial mechanical power captured for the wind turbine.
And 5: judging the angular velocity omega of the wind power generatorgWhether or not to enter the allowable fluctuation range, i.e. | ωg-ωg0Whether | is less than the critical stability threshold ωcIf so, the control process is ended, otherwise, the process goes to step 4.
Optionally, based on the virtual mass block technology, a dual-mass-block shafting model of the wind turbine is established, wind power absorbed by the wind turbine is converted into mechanical torque, and the mechanical torque is input to a rotating shaft of a rotor of the wind turbine, which specifically includes: the method comprises the following steps of establishing a wind turbine dual-mass shafting model as follows:
Figure GDA0002664917610000023
wherein, ω isrFor the angular speed of operation of the wind rotor of a wind turbine, i.e. the angular speed of the wind rotor, omegagIs the angular velocity of the wind turbine; theta is the shafting torque angle, HrAnd HgInertia time constants, K, of the wind turbine and the wind generator, respectivelySIs the shafting stiffness coefficient, Pr0Initial mechanical power captured for a wind turbine, kmaxAnd the maximum power tracking coefficient of the wind turbine generator is obtained.
Optionally, step 4 further includes:
the output mechanical power is adjusted by adjusting a pitch controller of the wind turbine so as to equivalently change the inertia time constant of the wind turbine, and then the power compensation quantity delta P generated by the pitch angle of the wind turbine is adjustedrIs composed of
Figure GDA0002664917610000031
Required power compensation amount deltaprThe compensation power change rate of the wind turbine generator is set to be P%, and then:
Figure GDA0002664917610000032
in the maximum power operation area, when the compensation power change rate of the wind turbine generator is P%, the wind energy utilization coefficient CPHCan be expressed as:
Figure GDA0002664917610000033
wherein the maximum wind energy utilization coefficient CPmaxCan be expressed as:
Figure GDA0002664917610000034
wherein, CPmaxFor the maximum wind energy utilization coefficient, the maximum wind energy utilization coefficient corresponding to the optimal tip speed ratio of a specific wind turbine is unique, and the maximum wind energy utilization coefficient C can be determined by searching a wind energy utilization coefficient curvePmaxDetermining the optimal tip speed ratio and the maximum wind energy utilization coefficient CPmaxThereafter, a pitch angle reference value β may be set according to equation (2)0。
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the method for stably controlling the double-mass shafting of the wind turbine based on the virtual mass block, the output mechanical power of the wind turbine is changed by monitoring the rotor rotating speed signal of the wind turbine and adjusting the pitch angle of the wind turbine, so that the flexible change of the inertia time constant of the wind turbine is realized, the unbalanced power formed by the wind turbine with the two-mass model in the dynamic process can be reduced, the interference tolerance of a flexible link component of the shafting of the wind turbine is improved, and the dynamic stability of the shafting of the wind turbine in the process of large-amplitude wind speed fluctuation and power adjustment is ensured; compared with the traditional shafting damping control, due to the fact that the wind turbine shafting torsion angle is difficult to measure in the actual engineering, the wind turbine shafting torsion angle control method introduces the rotating speed signal of the wind turbine, can flexibly adjust the equivalent inertia of the wind turbine shafting, and improves the oscillation capacity of the wind turbine damping shafting on the premise of not adding new hardware equipment; the control method is simple to operate, has few control parameters, is easy to set, has strong adaptability and feasibility, and can realize reliable control on the safe and stable operation of the wind turbine generator.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for controlling stability of a double-mass-block shafting of a wind turbine based on a virtual mass block according to the present invention;
FIG. 2 is a diagram of a simulation topology of a power generation system including a wind farm in an embodiment of the present invention;
FIG. 3 is a wind turbine generator electromagnetic power dynamic response comparison curve in the embodiment of the invention;
FIG. 4 is a comparison graph of the dynamic response of the rotor speed of the wind turbine in the embodiment of the invention;
FIG. 5 is a structural diagram of the virtual shafting stability control of the wind driven generator in the embodiment of the invention;
in the figure, SG1, first synchronous generator; SG2, second synchronous generator; DFIG, doubly-fed wind turbine; B1-B8, a first bus-bar to an eighth bus-bar; l1, first load; l2, second load; T1-T3, a first transformer-a third transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a virtual mass block-based stable control method for a double-mass shafting of a wind turbine, which can reduce unbalanced power formed by a two-mass model wind turbine generator in a dynamic process by adjusting the pitch angle of a wind turbine generator to change the output mechanical power, improve the interference tolerance of a flexible connecting part of the shafting of the wind turbine generator, and ensure the stable shafting oscillation of the wind turbine generator in the process of system disturbance and large-amplitude power adjustment.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method for controlling the stability of a virtual mass block-based wind turbine dual-mass-block shaft system, and as shown in fig. 1, the method for controlling the stability of the virtual mass block-based wind turbine dual-mass-block shaft system provided by the invention comprises the following steps:
step 1: based on a virtual mass block technology, establishing a double-mass-block shafting model of the wind turbine, converting wind power absorbed by the wind turbine into mechanical torque, and inputting the mechanical torque to a rotating shaft of a rotor of the wind driven generator;
step 2: monitoring angular velocity ω of wind turbineg；
And step 3: judging whether the shafting part of the wind turbine generator is disturbed or not, namely, judging omegagFrom the initial angular velocity omegag0Difference | ω ofg-ωg0Whether | is greater than the critical stability threshold ωcIf so, judging that the shafting part of the wind turbine generator is disturbedTurning to the step 4, otherwise, turning to the step 2;
and 4, step 4: according to the wind wheel operating angular velocity omega of the wind machinerJudging whether the wind turbine generator is in the maximum power operation area or not when the wind turbine generator is in the maximum power operation arearAt the cut-in electrical angular velocity ω0And the electrical angular velocity omega when entering the constant rotation speed region1In between, it means that the wind turbine is in the maximum power operation region, and at this time, the pitch angle of the wind turbine is set to be beta according to the formula (1)1The following are:
Figure GDA0002664917610000051
otherwise, the pitch angle of the wind turbine is set to β according to equation (2)0The following are:
Figure GDA0002664917610000052
where λ is tip speed ratio, λ ═ R ωrV,/v; r is the radius of the wind wheel, and v is the wind speed; cPmaxFor the maximum wind energy utilization coefficient, the maximum wind energy utilization coefficient corresponding to the optimal tip speed ratio of a specific wind turbine is unique, and the maximum wind energy utilization coefficient C can be determined by searching a wind energy utilization coefficient curvePmax；ΔωrThe rotor angular speed deviation of the wind wheel of the wind turbine is obtained; hr_vicRepresenting the virtual mass control coefficient, Pr0The initial mechanical power captured for the wind turbine.
And 5: judging the angular velocity omega of the wind power generatorgWhether or not to enter the allowable fluctuation range, i.e. | ωg-ωg0Whether | is less than the critical stability threshold ωcIf so, the control process is ended, otherwise, the process goes to step 4.
In the step 1, a double-mass shafting model of the wind turbine is established based on the virtual mass technology, wind power absorbed by the wind turbine is converted into mechanical torque, and the mechanical torque is input to a rotating shaft of a rotor of the wind turbine, and the method specifically includes the following steps: the method comprises the following steps of establishing a wind turbine dual-mass shafting model as follows:
Figure GDA0002664917610000061
wherein, ω isrFor the angular speed of operation of the wind rotor of a wind turbine, i.e. the angular speed of the wind rotor, omegagIs the angular velocity of the wind turbine; theta is the shafting torque angle, HrAnd HgInertia time constants, K, of the wind turbine and the wind generator, respectivelySIs the shafting stiffness coefficient, Pr0Initial mechanical power captured for a wind turbine, kmaxAnd the maximum power tracking coefficient of the wind turbine generator is obtained.
Laplace transform is performed on the formula (3) to obtain a state equation under the form of a complex frequency domain
Figure GDA0002664917610000062
Due to HrFar greater than HgCompared with Δ ΩrAnd Δ Θ, Δ ΩgThe state variable with the quick-change characteristic is replaced by an integral manifold approximately by utilizing an integral manifold method, so that a three-order state equation is subjected to order reduction processing, and an approximate expression of an analytic solution of a shafting state equation is obtained.
Get ═ Hg/(mHr) Wherein m is>2, multiplying both sides of the formula (3) simultaneously, then
Figure GDA0002664917610000063
Let the state variable Δ ωgThe integrated manifold of (d) is:
Δωg＝h(Δωr,Δθ,) (6)
when m is sufficiently small, equation (6) is expanded to a power series form:
Δωg＝h＝h0+h1+2h2+L o(n) (7)
the function h must satisfy the formula (7), then
Figure GDA0002664917610000071
Wherein the content of the first and second substances,
Figure GDA0002664917610000072
the left end and the right end of the formula (9) are related to0、1、2Are equal to each other, then
Figure GDA0002664917610000073
The state variable [ delta ] omega is obtained by taking the formula (10) into the formula (7)gIs approximately expressed as
Δωg≈KAΔθ+KBΔωr(11)
Wherein the content of the first and second substances,
Figure GDA0002664917610000074
tidying the state equation:
Figure GDA0002664917610000075
the state equation of the system is reduced to:
Figure GDA0002664917610000081
the characteristic equation of the state space after the reduction is as follows:
p2+(KA-a11)p-KAa11-(1-KB)a13＝0 (15)
the real part of the characteristic root corresponding to the axis oscillation mode is
Figure GDA0002664917610000082
As shown in the formula (16), a wind turbineSize of inertia HrDirectly related to the real part of the shafting oscillation mode, and when the equivalent inertia time constant H of the wind turbinerWhen decreasing, σ1,2The virtual axis approaching to the state plane is not beneficial to the dynamic stability of the shafting of the wind turbine generator. Therefore, it is necessary to provide a stable control method for a shaft system, which ensures the safe and stable operation of the wind turbine generator and the grid-connected system in the set control mode.
If the output mechanical power is adjusted by adjusting the pitch controller of the wind turbine so as to equivalently change the inertia time constant of the wind turbine, the power compensation quantity delta P generated by adjusting the pitch angle of the wind turbine is adjustedrIs composed of
Figure GDA0002664917610000083
According to equations (3) and (17), the equation of motion of the rotor of the wind turbine can be expressed as:
Figure GDA0002664917610000084
further finishing to obtain:
Figure GDA0002664917610000085
according to the derivation results of the equations (16) and (19), the real part of the characteristic root corresponding to the axis oscillation mode is
Figure GDA0002664917610000086
From the equation (20), the control coefficient H of the shafting stability controllerr_vicWhen the frequency is larger than 0, the real part of the characteristic root corresponding to the shafting oscillation mode is reduced; when H is presentr_vicWhen the distance is gradually increased from 0, the root track of the characteristic root moves to the left half plane of the coordinate plane, and the dynamic stability of the shafting is improved.
If the required power compensation amount is delta PrBorne by the pitch angle regulator, and the compensation power change rate of the wind turbine generator can be set to be P percent, then
Figure GDA0002664917610000091
In the maximum power operation area, when the variation rate of the compensating power of the unit is P%, the wind energy utilization coefficient CPHCan be expressed as:
Figure GDA0002664917610000092
wherein the maximum wind energy utilization coefficient CPmaxCan be expressed as
Figure GDA0002664917610000093
In the formula, CPmaxFor the maximum wind energy utilization coefficient, the maximum wind energy utilization coefficient corresponding to the optimal tip speed ratio of a specific wind turbine is unique, and the maximum wind energy utilization coefficient C can be determined by searching a wind energy utilization coefficient curvePmaxAfter the optimum tip speed ratio and the maximum wind energy utilization coefficient are determined, a pitch angle reference value may be set according to equation (2)
The compensation amount of the output mechanical power of the wind turbine is delta P calculated by the formula (22)rThe size of the corresponding pitch angle β 1.
In the constant rotating speed region, because the rotating speed fluctuation of the fan in the operating region is very small, the shafting torque formed between the two mass blocks is very small, at the moment, the pitch angle does not need to be adjusted, and the pitch angle is kept at beta0The set value of (2) is sufficient.
According to the formulas (3) and (4), when the wind speed fluctuation is large and the system is disturbed, the shafting dynamic equation of the wind driven generator generates unbalanced power, the rotor rotating speed of the generator starts to oscillate, and impact is caused on the flexible connecting part of the shafting. In order to enable the doubly-fed wind turbine generator set to maintain the dynamic stability of a shafting, when the wind turbine generator set operates in a maximum power operation area, the pitch angle of the wind turbine is reset to be beta according to the formula (22)1So that the mechanical power generated can respond to the change of the rotor speed by adjusting the virtualMass block control coefficient Hr_vicThe magnitude of (2) to quickly stabilize the unbalanced power between shafting, give the shafting dynamic safety short-time power support, and the control structure thereof is shown in fig. 5. In fig. 5, after comparing the wind turbine rotation speed reference command ω r with the actual rotation speed ω r, the pitch angle reference value β calculated according to the equation (2) may be outputted through the PI controller, the integration element 1/s and the inertia element 1/(T1s +1)0The integration link 1/s and the inertia link 1/(T1s +1) are used for simulating a servo mechanism of a wind turbine pitch control system, and T1 is a servo time constant. Control coefficient Hr_vicIs used to adjust the equivalent inertia of the virtual mass.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. Fig. 2 is a simulation topology structure diagram of a wind power-containing power generation system in an embodiment of the present invention, and the corresponding wind power grid-connected system includes a first synchronous generator SG1, a second synchronous generator SG2, a doubly-fed wind turbine generator DFIG, a first transformer T1, a second transformer T2, and a third transformer T3, where the first synchronous generator SG1 is connected to a third bus B3 through a first transformer T1, the second synchronous generator SG2 is connected to a fourth bus B4 through a second transformer T2, and the doubly-fed wind turbine generator DFIG is connected to the third bus B3 through a grid-connected converter and a third transformer T3 in sequence. In this embodiment, based on the DIgSILENT/Power Factory simulation platform, the built simulation system includes two synchronous generator sets with a rated capacity of 900 mw, and a doubly-fed wind farm with 400 doubly-fed wind turbine generators (DFIGs) connected in parallel, where the rated capacity of each DFIG is 2 mw, the wind farm is connected to the system via a third bus B3, a load L1 is 967 mw, and a load L2 is 1767 mw. In the simulation process, the simulation sampling step h of the system is 0.1 millisecond.
TABLE 1 doubly-fed wind turbine generator DFIG unit parameters
Figure GDA0002664917610000101
TABLE 2 Unit parameters of the synchronous Generator set SG
Figure GDA0002664917610000102
In order to verify the influence of the virtual mass block shafting stability control on the wind turbine generator shafting stability, a three-phase short-circuit fault with the duration of 0.1 second is set at an eighth bus B8 of the system shown in fig. 2, the wind speed is kept constant at 9 m/s in the fault process, and the unit parameters of the doubly-fed wind turbine generator DFIG and the unit parameters of the synchronous generator SG are shown in tables 1 and 2.
The following two control schemes are set to verify the influence of different control methods of the wind turbine generator on the shafting oscillation stability, which shows that the invention can flexibly set the pitch angle of the wind turbine through the virtual mass block shafting stability control method, adjust the mechanical power output by the wind turbine, reduce the unbalanced power formed in the dynamic process and improve the shafting dynamic stability performance of the wind turbine generator.
Scheme 1: the wind turbine generator has no additional shafting stability controller, namely, the shafting stability control coefficient Hr_vic＝0。
Scheme 2: the wind turbine generator is additionally provided with a virtual shafting stability controller and a shafting stability control coefficient Hr_vic＝30。
The electromagnetic power output by the wind driven generator and the rotor speed dynamic response curve thereof are shown in fig. 3 and 4. As can be seen from fig. 3a and 4a, since no additional shafting power control is provided, the wind turbine adjusts the output active power with a large amplitude during the system fault, so that the electromagnetic torque and the rotation speed of the wind turbine are greatly fluctuated when the control scheme 1 is implemented, which is not favorable for the dynamic stability of the shafting of the wind turbine; as can be seen from fig. 3b and 4b, after the virtual shafting stability control strategy, i.e. scheme 2, is implemented, the wind turbine generator sets the pitch angle to β according to equation (1)1The mechanical power is changed, the unbalanced power generated by the system in a shafting is compensated, the oscillation frequency of the electromagnetic torque of the wind turbine generator can be reduced, the rotating speed recovery time of the wind turbine generator is shortened, the anti-interference capability of the wind turbine generator is improved, and the safe and stable operation of the wind turbine generator is ensured.
According to the method for stably controlling the double-mass shafting of the wind turbine based on the virtual mass block, the output mechanical power of the wind turbine is changed by monitoring the rotor rotating speed signal of the wind turbine and adjusting the pitch angle of the wind turbine, so that the flexible change of the inertia time constant of the wind turbine is realized, the unbalanced power formed by the wind turbine with the two-mass model in the dynamic process can be reduced, the interference tolerance of a flexible link component of the shafting of the wind turbine is improved, and the dynamic stability of the shafting of the wind turbine in the process of large-amplitude wind speed fluctuation and power adjustment is ensured; compared with the traditional shafting damping control, due to the fact that the wind turbine shafting torsion angle is difficult to measure in the actual engineering, the wind turbine shafting torsion angle control method introduces the rotating speed signal of the wind turbine, can flexibly adjust the equivalent inertia of the wind turbine shafting, and improves the oscillation capacity of the wind turbine damping shafting on the premise of not adding new hardware equipment; the control method is simple to operate, has few control parameters, is easy to set, has strong adaptability and feasibility, and can realize reliable control on the safe and stable operation of the wind turbine generator.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (3)

1. A wind turbine double-mass-block shafting stability control method based on virtual mass blocks is characterized by comprising the following steps:
step 1: based on a virtual mass block technology, establishing a double-mass-block shafting model of the wind turbine, converting wind power absorbed by the wind turbine into mechanical torque, and inputting the mechanical torque to a rotating shaft of a rotor of the wind driven generator;
step 2: monitoring angular velocity ω of wind turbineg；
And step 3: judging whether the shafting part of the wind turbine generator is disturbed or not, namely, judging omegagFrom the initial angular velocity omegag0Difference | ω ofg-ωg0Whether | is largeAt a critical stability threshold ωcIf so, judging that the shafting part of the wind turbine generator is disturbed, and turning to the step 4, otherwise, turning to the step 2;
and 4, step 4: according to the wind wheel operating angular velocity omega of the wind machinerJudging whether the wind turbine generator is in the maximum power operation area or not when the wind turbine generator is in the maximum power operation arearAt the cut-in electrical angular velocity ω0And the electrical angular velocity omega when entering the constant rotation speed region1In between, it means that the wind turbine is in the maximum power operation region, and at this time, the pitch angle of the wind turbine is set to be beta according to the formula (1)1The following are:
Figure FDA0002664917600000011
otherwise, the pitch angle of the wind turbine is set to β according to equation (2)0The following are:
Figure FDA0002664917600000012
where λ is tip speed ratio, λ ═ R ωrV,/v; r is the radius of the wind wheel, and v is the wind speed; cPmaxThe maximum wind energy utilization coefficient; Δ ωrThe rotor angular speed deviation of the wind wheel of the wind turbine is obtained; hr_vicRepresenting the virtual mass control coefficient, Pr0Initial mechanical power captured for the wind turbine;
and 5: judging the angular velocity omega of the wind power generatorgWhether or not to enter the allowable fluctuation range, i.e. | ωg-ωg0Whether | is less than the critical stability threshold ωcIf so, the control process is ended, otherwise, the process goes to step 4.
2. The method for stably controlling the shafting of the wind turbine dual mass block based on the virtual mass block as claimed in claim 1, wherein the method for stably controlling the shafting of the wind turbine dual mass block based on the virtual mass block technology comprises the steps of establishing a model of the shafting of the wind turbine dual mass block, converting wind power absorbed by the wind turbine into mechanical torque, and inputting the mechanical torque to a rotating shaft of a rotor of the wind turbine generator: the method comprises the following steps of establishing a wind turbine dual-mass shafting model as follows:
Figure FDA0002664917600000021
wherein, ω isrFor the angular speed of operation of the wind rotor of a wind turbine, i.e. the angular speed of the wind rotor, omegagIs the angular velocity of the wind turbine; theta is the shafting torque angle, HrAnd HgInertia time constants, K, of the wind turbine and the wind generator, respectivelySIs the shafting stiffness coefficient, Pr0Initial mechanical power captured for a wind turbine, kmaxAnd the maximum power tracking coefficient of the wind turbine generator is obtained.
3. The virtual mass-based wind turbine dual-mass shafting stability control method according to claim 1, wherein the step 4 further comprises:
the output mechanical power is adjusted by adjusting a pitch controller of the wind turbine so as to equivalently change the inertia time constant of the wind turbine, and then the power compensation quantity delta P generated by the pitch angle of the wind turbine is adjustedrIs composed of
Figure FDA0002664917600000022
Required power compensation amount deltaprThe compensation power change rate of the wind turbine generator is set to be P%, and then:
Figure FDA0002664917600000023
in the maximum power operation area, when the compensation power change rate of the wind turbine generator is P%, the wind energy utilization coefficient CPHCan be expressed as:
Figure FDA0002664917600000024
wherein the maximum wind energy utilization coefficient CPmaxCan be expressed as:
Figure FDA0002664917600000025
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