CN115241894A - Method, system and medium for controlling primary frequency modulation of double-fed fan - Google Patents
Method, system and medium for controlling primary frequency modulation of double-fed fan Download PDFInfo
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- CN115241894A CN115241894A CN202210909663.XA CN202210909663A CN115241894A CN 115241894 A CN115241894 A CN 115241894A CN 202210909663 A CN202210909663 A CN 202210909663A CN 115241894 A CN115241894 A CN 115241894A
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- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- 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
- H02J3/381—Dispersed generators
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
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- 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
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- 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
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Abstract
The invention discloses a method, a system and a medium for controlling primary frequency modulation of a double-fed fan, belonging to the field of wind power generation, wherein the method comprises the following steps: calculating equivalent wind speed based on the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed so as to further calculate a pitch angle compensation signal; calculating a pitch angle reference signal to control the pitch angle of the fan and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed; calculating a first driving signal according to the electromagnetic power, the output reactive power, the three-phase voltage and the electromagnetic torque reference signal of the fan so as to drive the rotor-side PWM converter; and calculating to obtain a second driving signal according to the collected fan direct current bus capacitor voltage and the grid side q-axis current so as to drive the grid side PWM converter. The maximum power of the fan corresponding to the current wind speed can be accurately pre-judged under the condition that the wind speed is inaccurate to carry out accurate blade adjustment and load reduction on the fan on the basis.
Description
Technical Field
The invention belongs to the field of wind power generation, and particularly relates to a method, a system and a medium for controlling primary frequency modulation of a double-fed fan.
Background
Doubly-Fed Induction generators (DFIGs) are the most widely used wind generators. When the frequency of the grid-connected power supply system is lower than the rated frequency, the active output of the new energy station is increased according to the primary frequency modulation curve, and the limit of the primary frequency modulation power variation amplitude is set to be not less than 6% of the operating power. According to the above standard, if new energy equipment such as a double-fed fan participates in primary frequency modulation in a load reduction standby mode, at least 6% of rated power should be reduced. And only under the condition of finding the optimal power of the fan, accurate load shedding can be realized, otherwise, excessive load shedding or insufficient load shedding can be realized. The optimal power is hooked with the wind speed, so that the equivalent wind speed of the fan is measured or evaluated, and the load is accurately reduced.
In the prior art, two wind speed measurement modes exist, one is to install a wind speed measurement instrument on a wind turbine cabin to measure wind speed, and the other is to set a wind speed measurement device outside a wind turbine body to evaluate equivalent wind speed captured by the wind turbine. In the two modes, the measured wind speed does not represent the wind speed captured by the fan, and the wind speed of only one point is captured, namely the problem of inaccurate measurement exists, so that the calculated optimal power has errors, the electric energy waste is easily caused by excessive load shedding, or the standby power is insufficient due to insufficient load shedding, and the requirement of primary frequency modulation cannot be met.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a method, a system and a medium for controlling the primary frequency modulation of a double-fed fan, and aims to determine the due optimal power of the fan under the current operating condition according to the function corresponding relation of wind speed, pitch angle, rotating speed and mechanical power, and perform fixed load shedding on the basis and apply primary frequency modulation control.
In order to achieve the above object, according to an aspect of the present invention, a method for controlling primary frequency modulation of a doubly-fed wind turbine is provided, including: s1, calculating to obtain equivalent wind speed according to the collected fan power, pitch angle and fan rotating speed based on the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed, and calculating a pitch angle compensation signal according to grid-connected frequency, preset load shedding power, the equivalent wind speed and the fan power; s2, calculating a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed; s3, calculating to obtain a first driving signal according to the collected electromagnetic power, output reactive power, three-phase voltage and the electromagnetic torque reference signal of the fan, and calculating to obtain a second driving signal according to the collected direct-current bus capacitor voltage of the fan and the grid side q-axis current; and S4, controlling the pitch angle of the fan according to the pitch angle reference signal, driving a rotor-side PWM converter connected with a fan rotor according to the first driving signal, and driving a grid-side PWM converter connected with a power grid according to the second driving signal so as to adjust the rotating speed of the fan and the active power and the reactive power output by a fan stator.
Further, the calculating of the pitch angle compensation signal in S1 includes: calculating a difference value between the optimal power corresponding to the equivalent wind speed and the preset load shedding power to obtain a reference power in a load shedding operation state; obtaining compensation power after the grid-connected frequency is subjected to droop control, and taking the sum of the reference power and the compensation power in a load shedding operation state as fan reference power; calculating the pitch angle compensation signal according to the fan reference power and the fan power.
Still further, said calculating said pitch angle compensation signal based on said wind turbine reference power and said wind turbine power comprises: and calculating a difference value between the fan reference power and the fan power to obtain a power deviation, and obtaining the pitch angle compensation signal after the power deviation is subjected to proportional-integral control.
Further, the obtaining of the compensation power after the grid-connected frequency is subjected to droop control includes: and calculating the difference between the grid-connected frequency and the power frequency to obtain frequency deviation, and obtaining the compensation power after proportional control of the frequency deviation.
Still further, it includes: limiting the pitch angle compensation signal to 0 when the pitch angle compensation signal is less than 0.
Still further, the S2 includes: taking the optimal rotating speed corresponding to the fan power as a fan reference rotating speed, and calculating a difference value between the fan reference rotating speed and the fan rotating speed to obtain a rotating speed deviation; the rotating speed deviation is subjected to proportional integral control to obtain the electromagnetic torque reference signal; and obtaining a pitch angle control signal after the rotation speed deviation is subjected to proportional control, and calculating the sum of the pitch angle compensation signal and the pitch angle control signal to obtain the pitch angle reference signal.
Still further, it includes: limiting the pitch angle control signal to 0 when the pitch angle control signal is less than 0.
According to another aspect of the invention, a doubly-fed wind turbine primary frequency modulation control system is provided, which is characterized by comprising: the system comprises a rotor-side PWM converter connected with a fan rotor and a grid-side PWM converter connected with a power grid; the slurry-adjusting load-reducing frequency modulation controller is used for calculating to obtain equivalent wind speed according to the collected fan power, pitch angle and fan rotating speed based on the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed, and calculating a pitch angle compensation signal according to grid-connected frequency, preset load-reducing power, the equivalent wind speed and the fan power; the fan controller is used for calculating a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed, and controlling the pitch angle of the fan according to the pitch angle reference signal; the rotor side current-voltage controller is used for calculating to obtain a first driving signal according to the collected electromagnetic power, the output reactive power, the three-phase voltage and the electromagnetic torque reference signal of the fan, and driving the rotor side PWM converter according to the first driving signal; the grid side current and voltage controller is used for calculating to obtain a second driving signal according to the collected fan direct current bus capacitor voltage and the grid side q-axis current, and driving the grid side PWM converter according to the second driving signal; the regulation of the rotating speed of the fan and the active power and the reactive power output by the stator of the fan is realized.
Still further, the size mixing, load reduction and frequency modulation controller comprises: the equivalent wind speed calculator is used for calculating the equivalent wind speed according to the acquired fan power, the pitch angle and the fan rotating speed on the basis of the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed; the optimal power calculator is used for calculating the optimal power corresponding to the equivalent wind speed; the first subtracter is used for calculating a difference value between the optimal power corresponding to the equivalent wind speed and the preset load shedding power to obtain reference power in a load shedding operation state; the droop controller is used for carrying out droop control on the grid-connected frequency to obtain compensation power; a first adder; the compensation power control device is used for calculating the sum of the reference power and the compensation power in the load shedding operation state to obtain the reference power of the fan; the second subtracter is used for calculating the difference between the fan reference power and the fan power to obtain a power deviation; and the first proportional integrator is used for carrying out proportional integral control on the power deviation to obtain the pitch angle compensation signal.
According to another aspect of the present invention, there is provided a computer readable storage medium, on which a computer program is stored, wherein the program is executed by a processor to implement the method for primary frequency modulation control of a doubly-fed wind turbine as described above.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained: the method comprises the steps of determining the due optimal power of the fan at the current wind speed based on the functional relation among the fan power, the pitch angle, the fan rotating speed and the wind speed, obtaining more accurate optimal power, adjusting the propeller and reducing the load of the fan on the basis, reserving the standby power required by primary frequency modulation accurately, and avoiding energy waste caused by excessive load reduction and active power deficiency during frequency modulation caused by insufficient load reduction while ensuring that the fan participates in primary frequency modulation and responds timely.
Drawings
Fig. 1 is a flowchart of a method for controlling primary frequency modulation of a doubly-fed wind turbine according to an embodiment of the present invention;
fig. 2 is a block diagram of a doubly-fed wind turbine primary frequency modulation control system according to an embodiment of the present invention;
FIG. 3 is a control schematic diagram of a size-mixing, load-reducing and frequency-modulating controller according to an embodiment of the present invention;
fig. 4 is a control schematic diagram of a droop controller in a size-mixing, load-reducing and frequency-modulating controller according to an embodiment of the present invention;
fig. 5 is a control schematic diagram of a fan controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present application, the terms "first," "second," and the like (if any) in the description and the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Fig. 1 is a flowchart of a doubly-fed wind turbine primary frequency modulation control method according to an embodiment of the present invention. Referring to fig. 1 and fig. 2 to fig. 5, a method for controlling the primary frequency modulation of the doubly-fed wind turbine in the present embodiment is described in detail, where the method includes operations S1 to S4.
And operation S1, based on the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed, calculating to obtain an equivalent wind speed according to the collected fan power, the pitch angle and the fan rotating speed, and calculating a pitch angle compensation signal according to the grid-connected frequency, the preset load shedding power, the equivalent wind speed and the fan power.
Taking the doubly-fed wind turbine primary frequency modulation control system shown in fig. 2 as an example, in this embodiment, operation S1 is performed by a pitch regulation and load reduction frequency modulation controller in the system, as shown in fig. 3. According to an embodiment of the invention, operation S1 comprises sub-operation S11-sub-operation S14.
In sub-operation S11, based on the mapping relationship between the fan power, the pitch angle, the fan rotation speed, and the wind speed, the equivalent wind speed is calculated according to the collected fan power, pitch angle, and fan rotation speed.
The fan power of the wind energy captured by the fan has a certain functional relationship with the pitch angle, the fan rotating speed and the wind speed, namely P m ＝f(v,ω r β) in which P m Is the fan power, beta is the pitch angle, omega r Is the fan speed, v is the wind speed. Thus, based on the collected fan power, pitch angle and fan speed, an equivalent wind speed can be determined, which is done by an equivalent wind speed calculator in the pitch regulation and load shedding fm controller.
In sub-operation S12, a difference between the optimal power corresponding to the equivalent wind speed and a preset load shedding power is calculated to obtain a reference power in a load shedding operation state.
In the optimal power tracking area and the constant rotating speed area, the pitch angle beta of the optimal working point is 0. After the equivalent wind speed is determined, the relationship P may be passed based on the determined equivalent wind speed and the pitch angle 0 m ＝f(v,ω r And beta) calculating the optimal power corresponding to the equivalent wind speed, wherein the operation is completed by an optimal power calculator in the size-mixing load-reducing frequency-modulation controller.
Further, the optimal power and the preset deloading power P are calculated deline The difference is the reference power in the deloading running state, and the operation is completed by a first subtracter in the sizing deloading frequency modulation controller.
In sub-operation S13, the grid-connected frequency is subjected to droop control to obtain the compensation power, and a sum of the reference power and the compensation power in the load shedding operation state is used as the fan reference power.
According to the embodiment of the invention, the step of obtaining the compensation power after the grid-connected frequency is subjected to droop control specifically comprises the following steps: and calculating the difference between the grid-connected frequency and the power frequency f to obtain frequency deviation, and obtaining the compensation power after the frequency deviation is subjected to proportional control.
Specifically, the grid-connected frequency is subjected to compensation power through a droop controller in a size-mixing load-shedding frequency modulation controller, for example. The droop controller has a structure as shown in fig. 4, and includes a third subtractor and a first scaler. Calculating the grid-connected frequency f by a third subtracter ref And the difference value between the frequency deviation and the power frequency f is obtained and input into a first comparator, and the first comparator outputs compensation power after proportional control. And the first adder adds the reference power output by the first subtracter in the load shedding operation state and the compensation power output by the first comparator to obtain the reference power of the fan.
In sub-operation S14, a pitch angle compensation signal is calculated based on the fan reference power and the fan power.
According to an embodiment of the present invention, sub-operation S14 specifically includes: and calculating a difference value between the reference power of the fan and the power of the fan to obtain a power deviation, and obtaining a pitch angle compensation signal after the power deviation is controlled by proportional integral.
Specifically, for example, a difference value between the reference power of the fan and the power of the fan is calculated through a second subtracter in the size-mixing, load-reducing and frequency-modulating controller, so as to obtain a power deviation; after the power deviation passes through a first proportional integrator in the size-mixing, load-reducing and frequency-modulating controller, the power deviation is subjected to the first proportional integrationOutput pitch angle compensation signal beta cps 。
According to an embodiment of the present invention, when the pitch angle compensation signal is less than 0, it is necessary to limit the pitch angle compensation signal to 0 to ensure that the pitch angle compensation signal is greater than or equal to 0.
And operation S2, calculating to obtain a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed.
Taking the doubly-fed wind turbine primary frequency modulation control system shown in fig. 2 as an example, in the present embodiment, the operation S2 is performed by a wind turbine controller in the system. According to an embodiment of the invention, operation S2 comprises sub-operation S21-sub-operation S23.
In sub-operation S21, the optimal rotation speed corresponding to the fan power is used as a fan reference rotation speed, and a difference between the fan reference rotation speed and the fan rotation speed is calculated to obtain a rotation speed deviation.
Because the optimal rotating speed of the fan and the fan power form a one-to-one corresponding relation, the reference rotating speed of the fan, namely the optimal rotating speed corresponding to the fan power, can be given based on the fan power. This operation may be accomplished by an optimum speed calculator in the fan controller, as shown in FIG. 5. And the optimal rotating speed calculator judges whether the fan works in a maximum rotating speed area or a suboptimal power tracking area according to the input fan power and gives a reference rotating speed of the fan.
Further, the fan reference speed and the fan speed ω are calculated, for example by a fourth subtractor in the fan controller r The difference between the two values, the rotating speed deviation is obtained.
In sub-operation S22, the rotational speed deviation is subjected to proportional-integral control to obtain an electromagnetic torque reference signal. Specifically, the rotating speed deviation is input into a second proportional integrator in the fan controller, and an electromagnetic torque reference signal T is obtained after proportional-integral control emref 。
In sub-operation S23, the rotation speed deviation is subjected to proportional control to obtain a pitch angle control signal, and a sum of the pitch angle compensation signal and the pitch angle control signal is calculated to obtain a pitch angle reference signal.
Specifically, the rotational speed deviation is input to a second one of the fan controllersAnd the proportioner obtains a pitch angle control signal after proportional control. According to an embodiment of the invention, when the pitch angle control signal is less than 0, it is necessary to limit the pitch angle control signal to 0 to ensure that the pitch angle control signal is equal to or greater than 0. Further, the pitch angle control signal is input to a second adder, which calculates a pitch angle compensation signal β cps The sum of the pitch angle control signal and the reference pitch angle signal beta ref 。
And operation S3, calculating to obtain a first driving signal according to the collected electromagnetic power, output reactive power, three-phase voltage and electromagnetic torque reference signal of the fan, and calculating to obtain a second driving signal according to the collected fan direct current bus capacitor voltage and grid side q-axis current.
Taking the doubly-fed wind turbine primary frequency modulation control system shown in fig. 2 as an example, in this embodiment, operation S3 is performed by a rotor-side current-voltage controller and a grid-side current-voltage controller in the system. Specifically, the electromagnetic power P of the fan is collected e Output reactive power Q and three-phase voltage u abc And an electromagnetic torque reference signal T emref Inputting the rotor side current and voltage controller to obtain a first driving signal; collected fan DC bus capacitor voltage U dc Sum net side q-axis current i gq And inputting the current and voltage controller at the network side to obtain a second driving signal.
And operation S4, controlling the pitch angle of the fan according to the pitch angle reference signal, driving a rotor-side PWM converter connected with a fan rotor according to the first driving signal, and driving a grid-side PWM converter connected with a power grid according to the second driving signal so as to adjust the rotating speed of the fan and the active power and the reactive power output by the fan stator.
In the embodiment, a rotor of the double-fed fan is electrically connected with an output end of a rotor-side PWM converter, and a stator of the double-fed fan is connected into a power grid through a transformer; the input end of the network side PWM converter is connected with the capacitor through the direct current bus and is connected with the input end of the rotor side PWM converter; and the output end of the grid-side PWM converter is connected with the transformer through the filter inductor and is connected with a power grid.
Double feed as shown in fig. 2For example, a primary frequency modulation control system of a wind turbine, a wind turbine controller outputs a pitch angle reference signal beta based on the primary frequency modulation control system ref And controlling the pitch angle of the fan, driving the rotor-side PWM converter by the rotor-side current-voltage controller based on the first driving signal output by the rotor-side current-voltage controller, and driving the grid-side PWM converter by the grid-side current-voltage controller based on the second driving signal output by the grid-side current-voltage controller.
The control targets of the rotor-side PWM converter and the rotor-side current-voltage control are two: firstly, current required by excitation is provided for a rotor of the double-fed fan so as to adjust reactive power output by a stator; and secondly, the torque and the rotating speed of the doubly-fed fan are controlled through the current torque component of the rotor, so that the active power output by the fan is controlled. The main functions of the grid-side PWM converter are to keep the voltage of the dc bus stable and to control the input power factor.
The embodiment of the invention also provides a doubly-fed fan primary frequency modulation control system, and the structural block diagrams of the doubly-fed fan primary frequency modulation control system are shown in figures 2-5. The system comprises: a rotor-side PWM converter connected to the fan rotor, and a grid-side PWM converter connected to the grid. The system further comprises: the system comprises a pitch regulation, load reduction and frequency modulation controller, a wind turbine generator, a grid-connected frequency, a preset load reduction power, an equivalent wind speed and a wind speed compensation signal, wherein the pitch regulation, load reduction and frequency modulation controller is used for calculating to obtain the equivalent wind speed according to the collected wind turbine generator power, pitch angle and wind turbine generator speed based on the mapping relation among the wind turbine generator power, pitch angle, wind turbine generator speed and wind speed, and calculating the pitch angle compensation signal according to the grid-connected frequency, the preset load reduction power, the equivalent wind speed and the wind turbine generator power; the fan controller is used for calculating a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed and controlling the pitch angle of the fan according to the pitch angle reference signal; the rotor side current-voltage controller is used for calculating to obtain a first driving signal according to the collected electromagnetic power, output reactive power, three-phase voltage and electromagnetic torque reference signal of the fan and driving the rotor side PWM converter according to the first driving signal; the grid side current and voltage controller is used for calculating to obtain a second driving signal according to the collected fan direct current bus capacitor voltage and the grid side q-axis current, and driving the grid side PWM converter according to the second driving signal; the regulation of the rotating speed of the fan and the active power and the reactive power output by the stator of the fan is realized.
According to an embodiment of the invention, a size mixing, load shedding and frequency modulation controller comprises: the equivalent wind speed calculator is used for calculating the equivalent wind speed according to the acquired fan power, the pitch angle and the fan rotating speed on the basis of the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed; the optimal power calculator is used for calculating the optimal power corresponding to the equivalent wind speed; the first subtractor is used for calculating a difference value between the optimal power corresponding to the equivalent wind speed and the preset deloading power to obtain reference power in a deloading running state; the droop controller is used for carrying out droop control on grid-connected frequency to obtain compensation power; a first adder; the power control device is used for calculating the sum of reference power and compensation power in a load shedding operation state to obtain fan reference power; the second subtracter is used for calculating the difference value between the fan reference power and the fan power to obtain power deviation; and the first proportional integrator is used for carrying out proportional integral control on the power deviation to obtain a pitch angle compensation signal.
The primary frequency modulation control system of the doubly-fed wind turbine in this embodiment is used to execute the primary frequency modulation control method of the doubly-fed wind turbine shown in fig. 1 to 5, and the structure and the principle of the primary frequency modulation control system of the doubly-fed wind turbine are the same as those of the primary frequency modulation control system of the doubly-fed wind turbine in the embodiment shown in fig. 1 to 5, and are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling primary frequency modulation of a doubly-fed wind turbine as shown in fig. 1 to 5.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for controlling primary frequency modulation of a doubly-fed fan is characterized by comprising the following steps:
s1, calculating to obtain equivalent wind speed according to the collected fan power, pitch angle and fan rotating speed based on the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed, and calculating a pitch angle compensation signal according to grid-connected frequency, preset load shedding power, the equivalent wind speed and the fan power;
s2, calculating a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed;
s3, calculating to obtain a first driving signal according to the collected electromagnetic power, output reactive power, three-phase voltage and the electromagnetic torque reference signal of the fan, and calculating to obtain a second driving signal according to the collected direct-current bus capacitor voltage of the fan and the grid side q-axis current;
and S4, controlling the pitch angle of the fan according to the pitch angle reference signal, driving a rotor-side PWM converter connected with a fan rotor according to the first driving signal, and driving a grid-side PWM converter connected with a power grid according to the second driving signal so as to adjust the rotating speed of the fan and the active power and the reactive power output by a fan stator.
2. The doubly-fed wind turbine primary frequency modulation control method of claim 1, wherein the calculating a pitch angle compensation signal in S1 comprises:
calculating a difference value between the optimal power corresponding to the equivalent wind speed and the preset load shedding power to obtain a reference power in a load shedding operation state;
the grid-connected frequency is subjected to droop control to obtain compensation power, and the sum of the reference power in a load shedding operation state and the compensation power is used as fan reference power;
calculating the pitch angle compensation signal according to the fan reference power and the fan power.
3. The method for primarily tuning control of a doubly fed wind turbine as claimed in claim 2 wherein said calculating said pitch angle compensation signal based on said wind turbine reference power and said wind turbine power comprises:
and calculating a difference value between the fan reference power and the fan power to obtain a power deviation, and obtaining the pitch angle compensation signal after the power deviation is subjected to proportional-integral control.
4. The doubly-fed wind turbine primary frequency modulation control method of claim 2, wherein the step of obtaining the compensation power after the grid-connected frequency is subjected to droop control comprises the steps of:
and calculating the difference between the grid-connected frequency and the power frequency to obtain frequency deviation, and obtaining the compensation power after proportional control of the frequency deviation.
5. The doubly-fed wind turbine primary frequency modulation control method of any one of claims 2 to 4, further comprising: limiting the pitch angle compensation signal to 0 when the pitch angle compensation signal is less than 0.
6. The doubly-fed wind turbine primary frequency modulation control method of claim 1, wherein the S2 comprises:
taking the optimal rotating speed corresponding to the fan power as a fan reference rotating speed, and calculating a difference value between the fan reference rotating speed and the fan rotating speed to obtain a rotating speed deviation;
the rotating speed deviation is subjected to proportional integral control to obtain the electromagnetic torque reference signal;
and obtaining a pitch angle control signal after the rotation speed deviation is subjected to proportional control, and calculating the sum of the pitch angle compensation signal and the pitch angle control signal to obtain the pitch angle reference signal.
7. The doubly-fed wind turbine primary frequency modulation control method of claim 6, further comprising: limiting the pitch angle control signal to 0 when the pitch angle control signal is less than 0.
8. The utility model provides a doubly-fed fan primary frequency modulation control system which characterized in that includes: the system comprises a rotor-side PWM converter connected with a fan rotor and a grid-side PWM converter connected with a power grid;
the system comprises a pitch regulation load reduction frequency modulation controller, a wind turbine generator, a grid-connected frequency, a preset load reduction power, an equivalent wind speed and a pitch angle compensation signal, wherein the pitch regulation load reduction frequency modulation controller is used for calculating to obtain the equivalent wind speed according to the collected wind turbine generator power, the pitch angle and the wind turbine generator speed based on the mapping relation among the wind turbine generator power, the pitch angle, the wind turbine generator speed and the wind speed, and calculating the pitch angle compensation signal according to the grid-connected frequency, the preset load reduction power, the equivalent wind speed and the wind turbine generator power;
the fan controller is used for calculating a pitch angle reference signal and an electromagnetic torque reference signal according to the pitch angle compensation signal, the fan power and the fan rotating speed, and controlling the pitch angle of the fan according to the pitch angle reference signal;
the rotor side current-voltage controller is used for calculating to obtain a first driving signal according to the collected electromagnetic power, output reactive power, three-phase voltage and the electromagnetic torque reference signal of the fan and driving the rotor side PWM converter according to the first driving signal;
the grid side current and voltage controller is used for calculating to obtain a second driving signal according to the collected fan direct current bus capacitor voltage and the grid side q-axis current, and driving the grid side PWM converter according to the second driving signal; the regulation of the rotating speed of the fan and the active power and the reactive power output by the stator of the fan is realized.
9. The doubly-fed wind turbine primary frequency modulation control system of claim 8, wherein the pitch and load shedding frequency modulation controller comprises:
the equivalent wind speed calculator is used for calculating the equivalent wind speed according to the acquired fan power, the pitch angle and the fan rotating speed on the basis of the mapping relation among the fan power, the pitch angle, the fan rotating speed and the wind speed;
the optimal power calculator is used for calculating the optimal power corresponding to the equivalent wind speed;
the first subtractor is used for calculating a difference value between the optimal power corresponding to the equivalent wind speed and the preset deloading power to obtain a reference power in a deloading running state;
the droop controller is used for carrying out droop control on the grid-connected frequency to obtain compensation power;
a first adder; the compensation power control device is used for calculating the sum of the reference power and the compensation power in the load shedding operation state to obtain the reference power of the fan;
the second subtracter is used for calculating the difference value between the fan reference power and the fan power to obtain power deviation;
and the first proportional integrator is used for carrying out proportional integral control on the power deviation to obtain the pitch angle compensation signal.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the doubly-fed wind turbine primary tuning control method according to any of claims 1 to 7.
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| CN116137444A (en) * | 2023-02-14 | 2023-05-19 | 武汉理工大学 | Double-fed fan additional active control system for optimizing system frequency response |
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