CN112628069B - Fan inertia response control method and system considering influence of turbulent wind speed on rotating speed recovery - Google Patents

Fan inertia response control method and system considering influence of turbulent wind speed on rotating speed recovery Download PDF

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CN112628069B
CN112628069B CN202011504391.2A CN202011504391A CN112628069B CN 112628069 B CN112628069 B CN 112628069B CN 202011504391 A CN202011504391 A CN 202011504391A CN 112628069 B CN112628069 B CN 112628069B
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fan
rotating speed
speed
electromagnetic power
recovery
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CN112628069A (en
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殷明慧
陈载宇
张正阳
卜京
周连俊
邹云
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/103—Purpose of the control system to affect the output of the engine
    • F05B2270/1033—Power (if explicitly mentioned)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/32—Wind speeds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/327—Rotor or generator speeds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/335—Output power or torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/337—Electrical grid status parameters, e.g. voltage, frequency or power demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Abstract

The invention discloses a fan inertia response control method and system considering the influence of turbulent wind speed on rotation speed recovery. Aiming at the problem that reliable recovery of the rotating speed and power grid frequency support cannot be considered when single electromagnetic power is set at the turbulent wind speed, the invention fully considers the gradual-up/gradual-down gust alternating change characteristic of the turbulent wind speed, switches and sets the electromagnetic power instruction of the fan according to the wind speed change at the rotating speed recovery stage of inertial response control, accelerates the wind wheel by using strong pneumatic power when the gust is gradually increased, and interrupts the rotating speed recovery and switches to a suboptimal power curve to operate so as to calm the fan when the gust is gradually decreased. The invention can reliably realize the speed recovery under the turbulent wind speed and simultaneously avoid the secondary drop of the power grid frequency.

Description

Fan inertia response control method and system considering influence of turbulent wind speed on rotating speed recovery
Technical Field
The invention belongs to the field of fan control, and particularly relates to a fan inertia response control method and system considering comprehensive influence of turbulent wind speed on rotating speed recovery.
Background
The variable speed wind turbine generator set widely adopted in the current power system generally operates in a maximum power point tracking mode, the rotating speed of a wind wheel is decoupled from the frequency of a power grid, and the increasingly high wind power ratio brings a difficult challenge to maintaining the frequency stability of the power system. Therefore, when a frequency event occurs, the wind turbine generator needs to adopt inertia corresponding control, and provides short-time active power support for a power grid by releasing kinetic energy of a wind wheel, so that the frequency response of the power grid is improved.
In order to guarantee the operation stability and the power generation benefit of the wind turbine generator, the wind wheel needs to be accelerated to the optimal rotating speed again after the frequency support is finished. At present, most researches on the rotating speed recovery method pay attention to coordination of wind wheel rotating speed recovery and power grid support, and two types of rotating speed recovery methods are mainly proposed, namely a recovery method based on constant electromagnetic power and a recovery method based on preset accelerating power. The electromagnetic power instruction of the wind turbine generator is set according to a certain constant value lower than the aerodynamic power captured by the wind wheel in the former case, and the electromagnetic power instruction of the wind turbine generator is set according to the expected acceleration power and the aerodynamic power captured by the wind wheel in the latter case.
However, the above-described rotational speed recovery methods all employ a single electromagnetic power setting. Because the actual turbulent wind speed has strong random fluctuation, the single electromagnetic power setting cannot meet the operation requirement of the wind turbine generator set on both rotating speed recovery and power grid support. On one hand, if the recovery method always adopts the overhigh electromagnetic power setting, the gradual-down gust contained in the turbulent wind speed can cause the interruption of the recovery and even the failure of the recovery, thereby causing the secondary drop of the power grid frequency; on the other hand, the continuous recovery of the rotating speed during the gradual wind gust can cause the wind generating set to support the active power of the power grid insufficiently, and further cause the secondary drop of the power grid frequency.
Disclosure of Invention
The invention aims to provide a fan inertia response control method and system considering the comprehensive influence of turbulent wind speed on rotating speed recovery.
The technical solution for realizing the purpose of the invention is as follows: a method of controlling inertial response of a wind turbine taking into account the effect of turbulent wind speed on speed recovery, the method comprising the steps of:
step 1, acquiring structural parameters and pneumatic parameters of a fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed
Figure BDA0002844455320000027
And grid frequency deviation;
step 2, detecting whether the frequency deviation of the power grid exceeds a dead zone, if not, starting maximum power point tracking control, otherwise, starting inertial response control of the fan, and turning to step 3;
step 3, selecting the electromagnetic power setting mode as a frequency support mode, and turning to step 4;
step 4, judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, turning to step 5, otherwise, turning to step 3;
step 5, taking the rotating speed when the frequency support is finished as the reference rotating speed for judging the rotating speed recovery state
Figure BDA0002844455320000021
Then go to step 6;
step 6, selecting an electromagnetic power setting mode in a rotating speed recovery stage according to the actual rotating speed of the fan: if it is
Figure BDA0002844455320000022
Will be provided with
Figure BDA0002844455320000023
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise, setting the electromagnetic power to select a fan stabilization mode, and then turning to the step 7;
and 7, judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control by the fan, and otherwise, turning to the step 6.
A fan inertial response control system taking into account the effect of turbulent wind speed on speed recovery, the system comprising, in sequence:
the fan parameter acquisition module is used for acquiring the structural parameters and the pneumatic parameters of the fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed
Figure BDA0002844455320000028
And grid frequency deviation;
the system comprises an inertia response control starting module, a frequency support stage electromagnetic power setting module and a maximum power point tracking control module, wherein the inertia response control starting module is used for detecting whether the frequency deviation of a power grid exceeds a dead zone in real time;
the frequency support stage electromagnetic power setting module is used for selecting the electromagnetic power setting mode as a frequency support mode and switching to the first judgment module;
the first judgment module is used for judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, the reference rotating speed initialization module is switched to, and if not, the electromagnetic power setting module is switched to the frequency support stage;
a reference rotation speed initialization module for taking the rotation speed at the end of the frequency support as the reference rotation speed for judging the rotation speed recovery state
Figure BDA0002844455320000024
Then, the electromagnetic power setting mode selection module is switched to a rotating speed recovery stage;
and the electromagnetic power setting mode selection module is used for selecting an electromagnetic power setting mode according to the actual rotating speed of the fan: if it is
Figure BDA0002844455320000025
Will be provided with
Figure BDA0002844455320000026
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise setting the electromagnetic power to select a fan stabilization mode, and then switching to a second judgment module;
and the second judging module is used for judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control on the fan, and otherwise, switching to the electromagnetic power setting mode selection module in the rotation speed recovery stage.
Compared with the prior art, the invention has the following remarkable advantages: 1) the method for controlling the inertial response of the fan by considering the comprehensive influence of the turbulent wind speed on the rotating speed recovery is provided, and the problem that the reliable recovery of the rotating speed and the frequency support of a power grid are difficult to be considered under the turbulent wind speed in the existing method is solved; 2) the steps of the fan inertia response control method considering the comprehensive influence of turbulent wind speed on the rotating speed recovery are disclosed, the electromagnetic power setting is adjusted according to the wind condition in the rotating speed recovery stage, the strong pneumatic power is utilized to accelerate the wind wheel in the gradual strong gust, the suboptimal power curve is tracked to stabilize the fan in the gradual weak gust, the rotating speed of the wind wheel can be reliably recovered under the actual turbulent wind speed, and the secondary falling of the power grid frequency is avoided.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a flow chart of the speed recovery strategy of the present invention.
FIG. 2 is a structural diagram of a controller of a fan inertia response control method considering comprehensive influence of turbulent wind speed on rotation speed recovery.
Fig. 3 shows the experimental results of the validity verification of the present invention in an embodiment, in which (a) is the turbulent wind speed, and (b) to (d) are the electromagnetic power output by the wind turbine, the rotational speed of the wind turbine, and the influence on the grid frequency, respectively, in the method of the present invention and the conventional method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The invention provides a fan inertia response control method considering the influence of turbulent wind speed on rotation speed recovery, which comprises the following steps:
step 1, acquiring structural parameters and pneumatic parameters of a fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed
Figure BDA0002844455320000031
And grid frequency deviation;
step 2, detecting whether the frequency deviation of the power grid exceeds a dead zone, if not, starting maximum power point tracking control, otherwise, starting inertial response control of the fan, and turning to step 3;
step 3, selecting the electromagnetic power setting mode as a frequency support mode, and turning to step 4;
step 4, judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, turning to step 5, otherwise, turning to step 3;
step 5, taking the rotating speed when the frequency support is finished as the reference rotating speed for judging the rotating speed recovery state
Figure BDA0002844455320000041
Then go to step 6;
step 6, selecting an electromagnetic power setting mode in a rotating speed recovery stage according to the actual rotating speed of the fan: if it is
Figure BDA0002844455320000042
Will be provided with
Figure BDA0002844455320000043
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise, setting the electromagnetic power to select a fan stabilization mode, and then turning to the step 7;
and 7, judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control by the fan, and otherwise, turning to the step 6.
Further, with reference to fig. 1, an electromagnetic power setting strategy in the rotation speed recovery phase of the present invention is described:
the specific form of the wind wheel acceleration mode in the step 6 is as follows: when in use
Figure BDA0002844455320000044
In the process, the strong pneumatic power brought by the gradually-increased gust is utilized to accelerate the wind wheel, and the corresponding electromagnetic power instruction Pe.refThe setting form is as follows:
Figure BDA0002844455320000045
in the formula (I), the compound is shown in the specification,
Figure BDA0002844455320000046
Cp(λsub) Is λsubCorresponding wind energy utilization coefficient.
In step 6, the specific form of the fan stabilization mode is as follows: when in use
Figure BDA0002844455320000047
When the system is in use, the rotation speed is interrupted to recover, the stable operation of the fan is maintained by tracking a suboptimal power curve, and the corresponding electromagnetic power instruction Pe.refThe setting form is as follows:
Figure BDA0002844455320000048
in the formula, KsubThe coefficient of the suboptimal power curve is calculated by the following formula:
Figure BDA0002844455320000049
in the step 7, the rotation speed recovery termination condition is as follows:
Figure BDA00028444553200000410
in the formula (I), the compound is shown in the specification,
Figure BDA00028444553200000411
is composed of
Figure BDA00028444553200000412
And the maximum power point of the lower fan corresponds to the rotating speed.
The invention provides a fan inertia response control system considering the influence of turbulent wind speed on rotating speed recovery, which comprises the following steps of:
the fan parameter acquisition module is used for acquiring the structural parameters and the pneumatic parameters of the fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed
Figure BDA0002844455320000054
And grid frequency deviation;
the system comprises an inertia response control starting module, a frequency support stage electromagnetic power setting module and a maximum power point tracking control module, wherein the inertia response control starting module is used for detecting whether the frequency deviation of a power grid exceeds a dead zone in real time;
the frequency support stage electromagnetic power setting module is used for selecting the electromagnetic power setting mode as a frequency support mode and switching to the first judgment module;
the first judgment module is used for judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, the reference rotating speed initialization module is switched to, and if not, the electromagnetic power setting module is switched to the frequency support stage;
a reference rotation speed initialization module for taking the rotation speed at the end of the frequency support as the reference rotation speed for judging the rotation speed recovery state
Figure BDA0002844455320000051
Then, the electromagnetic power setting mode selection module is switched to a rotating speed recovery stage;
and the electromagnetic power setting mode selection module is used for selecting an electromagnetic power setting mode according to the actual rotating speed of the fan: if it is
Figure BDA0002844455320000052
Will be provided with
Figure BDA0002844455320000053
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise setting the electromagnetic power to select a fan stabilization mode, and then switching to a second judgment module;
and the second judging module is used for judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control on the fan, and otherwise, switching to the electromagnetic power setting mode selection module in the rotation speed recovery stage.
For the specific definition of the fan inertial response control system considering the influence of the turbulent wind speed on the rotation speed recovery, reference may be made to the above definition of the fan inertial response control method considering the influence of the turbulent wind speed on the rotation speed recovery, and details are not described here again. The modules in the fan inertial response control system considering the influence of the turbulent wind speed on the speed recovery can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The present invention will be described in further detail with reference to examples.
Examples
The method is verified through a power system dynamic simulation experiment platform with wind power access.
The control structure of the fan inertia response control method considering the comprehensive influence of the turbulent wind speed on the rotating speed recovery is shown in FIG. 2. When the power grid frequency deviation is detected to exceed the dead zone, the fan starts inertial response control, and the frequency support mode adopts electromagnetic power setting based on limited torque, and the form is as follows:
Figure BDA0002844455320000061
in the formula, ωr0For inertia response to control the wind wheel speed before starting,
Figure BDA0002844455320000062
for the optimal gain coefficient, T, under maximum power point tracking controllimIs the upper limit of electromagnetic torque of the fan, omegaminIs the lower limit of the rotation speed. The frequency support termination condition is as follows:
|Δωr|＜γ
in the formula,. DELTA.omegarThe variable quantity of the rotating speed of the wind wheel in two continuous control periods, and gamma is a convergence threshold value.
Selecting an electromagnetic power setting mode according to the actual rotating speed of the fan at the rotating speed recovery stage: when in use
Figure BDA0002844455320000063
When in use, will
Figure BDA0002844455320000064
Updating the current rotating speed, and setting and selecting a wind wheel acceleration mode according to the electromagnetic power; when in use
Figure BDA0002844455320000065
And when the electromagnetic power is set, the fan stabilizing mode is selected.
Then, whether the fan is full is judged according to the actual rotating speed of the fanEnd condition of foot rotation speed recovery
Figure BDA0002844455320000066
If the maximum power point tracking control is met, the fan terminates the inertia response control and starts the maximum power point tracking control.
The wind speed signal input by the fan adopts turbulent wind speed, and the existing method and the improved method provided by the invention are respectively tested, wherein the existing method respectively adopts a constant power-based recovery method and a preset accelerating power-based recovery method in the rotating speed recovery stage. The results of the experiment are shown in FIG. 3.
The curves in fig. 3 are respectively the turbulent wind speed, the comparison of the output electromagnetic power of the wind turbine in the method of the present invention and the existing method, the comparison of the rotational speed of the wind turbine in the method of the present invention and the existing method, and the comparison of the influence of the method of the present invention and the existing method on the grid frequency. Compared with the prior art, the method provided by the invention can reliably recover the rotating speed under the turbulent wind speed, and the secondary drop of the power grid frequency can not be caused in the rotating speed recovery stage.
The experimental results show that the wind wheel rotating speed can be reliably recovered and the secondary drop of the power grid frequency can be avoided under the turbulent wind speed by adopting the fan inertial response control method considering the comprehensive influence of the turbulent wind speed on the rotating speed recovery, so that the effectiveness and the practicability of the wind wheel inertial response control method are further verified.
To sum up, aiming at the problem that reliable recovery of the rotating speed and power grid frequency support cannot be considered easily when single electromagnetic power is set at the turbulent wind speed, the invention fully considers the gradual-up/gradual-down gust alternating change characteristic of the turbulent wind speed, switches and sets the electromagnetic power instruction of the fan according to the wind speed change at the rotating speed recovery stage of inertial response control, accelerates the wind wheel by using strong pneumatic power when the gust is gradually increased, and interrupts the rotating speed recovery and switches to a suboptimal power curve to operate so as to calm the fan when the gust is gradually decreased. The invention can reliably realize the speed recovery under the turbulent wind speed and simultaneously avoid the secondary drop of the power grid frequency.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (2)

1. A method of controlling inertial response of a wind turbine taking into account the effect of turbulent wind speed on speed recovery, the method comprising the steps of:
step 1, acquiring structural parameters and pneumatic parameters of a fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed v and grid frequency deviation;
step 2, detecting whether the frequency deviation of the power grid exceeds a dead zone, if not, starting maximum power point tracking control, otherwise, starting inertial response control of the fan, and turning to step 3;
step 3, selecting the electromagnetic power setting mode as a frequency support mode, and turning to step 4; the frequency support mode employs a torque limited based electromagnetic power setting, in the form:
Figure FDA0003410766960000011
in the formula, ωr0For inertia response to control the wind wheel speed before starting,
Figure FDA0003410766960000012
for the optimal gain coefficient, T, under maximum power point tracking controllimIs the upper limit of electromagnetic torque of the fan, omegaminIs the lower limit of the rotating speed;
step 4, judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, turning to step 5, otherwise, turning to step 3; the frequency support termination condition is as follows:
|Δωr|＜γ
in the formula,. DELTA.omegarThe variation of the rotating speed of the wind wheel in two continuous control periods is shown, and gamma is a convergence threshold value;
step 5, taking the rotating speed when the frequency support is finished as the reference rotating speed for judging the rotating speed recovery state
Figure FDA0003410766960000013
Then go to step 6;
step 6, selecting an electromagnetic power setting mode in a rotating speed recovery stage according to the actual rotating speed of the fan: if it is
Figure FDA0003410766960000014
Will be provided with
Figure FDA0003410766960000015
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise, setting the electromagnetic power to select a fan stabilization mode, and then turning to the step 7; electromagnetic power instruction P corresponding to wind wheel acceleration modee.refThe setting form is as follows:
Figure FDA0003410766960000016
in the formula (I), the compound is shown in the specification,
Figure FDA0003410766960000021
Cp(λsub) Is λsubCorresponding wind energy utilization coefficient;
electromagnetic power instruction P corresponding to draught fan stabilization modee.refThe setting form is as follows:
Figure FDA0003410766960000022
in the formula, KsubThe coefficient of the suboptimal power curve is calculated by the following formula:
Figure FDA0003410766960000023
step 7, judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control by the fan, and otherwise, turning to step 6;
the rotation speed recovery termination condition is as follows:
Figure FDA0003410766960000024
in the formula (I), the compound is shown in the specification,
Figure FDA0003410766960000025
is composed of
Figure FDA0003410766960000026
And the maximum power point of the lower fan corresponds to the rotating speed.
2. A wind turbine inertial response control system for implementing the method of claim 1 taking into account the effect of turbulent wind speed on speed recovery, characterized in that it comprises, in succession:
the fan parameter acquisition module is used for acquiring the structural parameters and the pneumatic parameters of the fan; the structural parameters comprise wind wheel radius R and electromagnetic torque upper limit TlimLower limit of rotation speed omegaminThe aerodynamic parameters comprise air density rho and optimal tip speed ratio lambdaoptMaximum wind energy utilization coefficient CpmaxReal-time rotating speed omega of fanrAverage wind speed v and grid frequency deviation;
the system comprises an inertia response control starting module, a frequency support stage electromagnetic power setting module and a maximum power point tracking control module, wherein the inertia response control starting module is used for detecting whether the frequency deviation of a power grid exceeds a dead zone in real time;
the frequency support stage electromagnetic power setting module is used for selecting the electromagnetic power setting mode as a frequency support mode and switching to the first judgment module;
the first judgment module is used for judging whether the frequency support termination condition is met or not according to the actual rotating speed of the fan, if so, the reference rotating speed initialization module is switched to, and if not, the electromagnetic power setting module is switched to the frequency support stage;
a reference rotation speed initialization module for taking the rotation speed at the end of the frequency support as the reference rotation speed for judging the rotation speed recovery state
Figure FDA0003410766960000027
Then, the electromagnetic power setting mode selection module is switched to a rotating speed recovery stage;
and the electromagnetic power setting mode selection module is used for selecting an electromagnetic power setting mode according to the actual rotating speed of the fan: if it is
Figure FDA0003410766960000031
Will be provided with
Figure FDA0003410766960000032
Updating to the current rotating speed, simultaneously setting the electromagnetic power to select a wind wheel acceleration mode, otherwise setting the electromagnetic power to select a fan stabilization mode, and then switching to a second judgment module;
and the second judging module is used for judging whether a preset rotation speed recovery termination condition is met or not according to the actual rotation speed of the fan, if so, starting maximum power point tracking control on the fan, and otherwise, switching to the electromagnetic power setting mode selection module in the rotation speed recovery stage.
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