CN110323789B - Wind turbine generator power control method and system based on virtual inertia simulation - Google Patents
Wind turbine generator power control method and system based on virtual inertia simulation Download PDFInfo
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- CN110323789B CN110323789B CN201910412319.8A CN201910412319A CN110323789B CN 110323789 B CN110323789 B CN 110323789B CN 201910412319 A CN201910412319 A CN 201910412319A CN 110323789 B CN110323789 B CN 110323789B
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
Abstract
The invention relates to a wind turbine generator power control method and system based on virtual inertia simulation, comprising the following steps: determining the output power of the wind turbine generator according to the real-time frequency of the power grid; and adjusting the real-time output power of the wind turbine generator to be the output power of the wind turbine generator. According to the technical scheme, when the wind power generation income is not influenced, the wind turbine generator is enabled to only respond to the dynamic change of the system frequency by setting the selection function and the parameters thereof, so that the equivalent moment of inertia provided by the wind turbine generator for the system is increased; under the condition of system failure or disturbance, the wind turbine generator can prevent the frequency from changing too fast, promote the low point of frequency change, and provide reaction time for primary frequency modulation of other wind turbine generators; meanwhile, the problem of secondary power drop caused by primary frequency modulation of the wind turbine generator is avoided, and the anti-interference capability of the system for resisting rapid change of power supply and load and the frequency stability of the high-proportion wind power system are improved.
Description
Technical Field
The invention relates to the field of inertia and frequency adjustment of wind power generation participation systems, in particular to a wind turbine generator power control method and system based on virtual inertia simulation.
Background
The variable-speed constant-frequency wind turbine generator is connected with the power electronic converter device through the fast control, so that decoupling control of a power generation system and a power grid is realized.
With the rapid development of wind power generation, the conventional synchronous generator set of the power system is replaced by wind power in a large quantity, the equivalent moment of inertia of the power system is continuously reduced, and the system frequency stability level is continuously reduced. Under the condition of high power loss or system fault, the full-network frequency fault is extremely easy to induce, and the large-scale access of wind power without inertia and frequency active supporting capability brings great challenges to the safe and stable operation of a power system.
In order to realize the maximum utilization of wind energy, most wind turbines run in a maximum power tracking state, the wind wheels of the large-capacity wind turbines are huge, the rotational inertia is large, and the kinetic energy of the rotor under the normal running condition is quite considerable. According to the traditional wind turbine generator virtual inertia frequency modulation control method based on the rotor kinetic energy, primary frequency modulation is carried out by utilizing the rotor kinetic energy of the wind turbine generator through frequency deviation term additional control so as to support the system frequency, however, the primary frequency modulation of a system is participated in, stable and durable energy sources are needed, if the primary frequency modulation is carried out by utilizing limited rotor kinetic energy only, the rotating speed of the wind turbine generator can be lowered due to the release of the rotor kinetic energy, the secondary power drop is necessarily caused after the primary frequency modulation is ended, and the frequency stabilization of a power system is not facilitated.
At present, a wind turbine active power control method for reasonably and effectively utilizing rotor kinetic energy, actively responding to system frequency change, providing inertia support for a system and improving the capability of a high-proportion wind power system for resisting rapid change of power supply and load and the system stability under the conditions of not affecting wind power generation income, leaving no power reserve and external energy storage does not exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a wind turbine generator power control method based on virtual inertia simulation, which adjusts the frequency modulation active power of a wind turbine generator by setting a selection function of a wind turbine generator frequency differentiation-active additional control link and a wind turbine generator frequency deviation-active additional control link and parameters thereof; the wind turbine generator is enabled to only respond to the dynamic change process of the system frequency, so that the dynamic change rate of the system frequency under the condition of power grid faults or disturbance is slowed down, the low point of the system frequency change is improved, the severity of the system frequency faults is reduced, and more reaction time is provided for frequency modulation control of other wind turbines; meanwhile, the problem of secondary power drop caused by primary frequency modulation by utilizing the kinetic energy of the rotor is effectively avoided, and the frequency stability performance of the high-proportion wind power system is enhanced.
The invention aims at adopting the following technical scheme:
the invention provides a wind turbine generator power control method based on virtual inertia simulation, which is improved in that the method comprises the following steps:
determining the output power of the wind turbine generator according to the real-time frequency of the power grid;
and adjusting the real-time output power of the wind turbine generator to be the output power of the wind turbine generator.
Preferably, the determining the output power of the wind turbine generator according to the real-time frequency of the power grid includes:
determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
and determining the output power of the wind turbine by utilizing the frequency modulation active power of the wind turbine.
Further, the determining the frequency modulation active power of the wind turbine generator set according to the real-time frequency of the power grid includes:
when f'>f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 1 +△P 2 ；
When f'>f s1 And Deltaf<f s2 At the time, deltaP W ＝△P 1 ；
When f'<f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 2 ；
When f'<f s1 And Deltaf<f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; deltaP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; deltaP 2 Frequency modulation active power of a wind turbine generator system frequency deviation-active additional control link; deltaP W The frequency modulation active power of the wind turbine generator is obtained.
Further, the frequency modulation active power DeltaP of the frequency differentiation-active additional control link of the wind turbine generator is determined according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
Wherein K is 2 The amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
the frequency deviation Δf of the grid is determined as follows:
△f＝f-f r
wherein f r Is the reference frequency of the power grid.
Further, the determining the output power of the wind turbine generator by using the frequency modulation active power of the wind turbine generator includes:
and determining the output power P of the wind turbine generator according to the following formula:
P＝△P W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
The invention provides a wind turbine generator power control system based on virtual inertia simulation, which is improved in that the system comprises:
and a determination module: the method comprises the steps of determining output power of a wind turbine generator according to real-time frequency of a power grid;
and an adjusting module: the method is used for adjusting the real-time output power of the wind turbine generator to be the output power of the wind turbine generator.
Preferably, the determining module includes:
a first determination unit: the frequency modulation active power generation device is used for determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
a second determination unit: the method is used for determining the output power of the wind turbine by utilizing the frequency modulation active power of the wind turbine.
Further, the first determining unit is configured to:
when f'>f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 1 +△P 2 ；
When f'>f s1 And Deltaf<f s2 At the time, deltaP W ＝△P 1 ；
When f'<f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 2 ；
When f'<f s1 And Deltaf<f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; deltaP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; deltaP 2 Frequency modulation active power of a wind turbine generator system frequency deviation-active additional control link; deltaP W The frequency modulation active power of the wind turbine generator is obtained.
Further, the frequency modulation active power DeltaP of the frequency differentiation-active additional control link of the wind turbine generator is determined according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
Wherein K is 2 The amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
the frequency deviation Δf of the grid is determined as follows:
△f＝f-f r
wherein f r Is the reference frequency of the power grid.
Further, the second determining unit is configured to:
and determining the output power P of the wind turbine generator according to the following formula:
P＝△P W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
Compared with the closest prior art, the invention has the following beneficial effects:
according to the technical scheme provided by the invention, the output power of the wind turbine generator is determined according to the real-time frequency of the power grid; adjusting the real-time output power of a wind turbine generator to be the output power of the wind turbine generator; under the condition that power standby and external energy storage are not arranged, the wind turbine generator is enabled to operate under the condition of maximum power tracking, so that wind power generation income is not influenced, meanwhile, reasonable utilization of limited rotor kinetic energy of the wind turbine generator is realized, the wind turbine generator does not participate in primary frequency modulation of a system, the problem of secondary power drop caused by primary frequency modulation by utilizing the rotor kinetic energy is effectively avoided, and frequency stability performance of a high-proportion wind power system is enhanced;
according to the technical scheme provided by the invention, the frequency modulation active power of the wind turbine is regulated by setting a selection function and parameters of a wind turbine frequency differentiation-active additional control link and a wind turbine frequency deviation-active additional control link; the power only responds to the dynamic change process of the system frequency, but does not respond to the steady-state process of the system frequency, so that the dynamic change rate of the system frequency under the condition of power grid faults or disturbance is slowed down, the low point of the system frequency change is promoted, the severity of the system frequency faults is slowed down, and more reaction time is provided for frequency modulation control of other units.
Drawings
FIG. 1 is a flow chart of a wind turbine power control method based on virtual inertia simulation;
FIG. 2 is a power control block diagram of a wind turbine based on virtual inertia simulation;
FIG. 3 is an effect diagram of a wind turbine active power control method based on virtual inertia when load steps are increased;
FIG. 4 is an effect diagram of a virtual inertia-based active power control method of a wind turbine generator when a load continuously changes;
FIG. 5 is a flow chart of a wind turbine power control system based on virtual inertia simulation.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a wind turbine generator power control method based on virtual inertia simulation, as shown in fig. 1, the method comprises the following steps:
step 101: determining the output power of the wind turbine generator according to the real-time frequency of the power grid;
step 102: and adjusting the real-time output power of the wind turbine generator to be the output power of the wind turbine generator.
In the preferred embodiment of the present invention, as shown in fig. 2, an active power control block diagram of a wind turbine based on virtual inertia simulation mainly includes: wind turbine generator system frequency differentiation-active additional control link and wind turbine generator system frequency deviation-active additional control link; the purposes of rapidly controlling the electromagnetic torque of the generator, rapidly throughput the kinetic energy of the wind wheel rotor and providing inertia support for a power grid are achieved by setting a wind turbine generator frequency differential-active additional control link and a wind turbine generator frequency deviation-active additional control link.
The control process of the wind turbine generator frequency differentiation-active additional control link can be as follows: at the initial moment of the frequency change of the power grid, if the frequency differential (frequency change rate) does not exceed the dead zone threshold value 1, frequency modulation is not carried out through a wind turbine generator frequency differential-active additional control link; if the frequency differential (frequency change rate) exceeds the dead zone threshold value 1, the frequency change rate is selected by selecting the function 1 to filter the effective control information, and the coefficient K is amplified by the differential term 1 Forming additional active power DeltaP 1 。
The control process of the wind turbine generator frequency deviation-active additional control link can be as follows:
if the frequency deviation delta f does not exceed the dead zone threshold 2, frequency modulation is not carried out through a wind turbine generator frequency deviation-active additional control link; if the frequency deviation Deltaf exceeds the dead zone threshold 2, the frequency deviation is subjected to effective control information screening through the selection function 2, and the frequency deviation is amplified by a deviation term amplification factor K 2 Forming additional active power DeltaP 2 。
The dead zone threshold value 1 and the dead zone threshold value 2 are set, so that the wind turbine generator set frequency differentiation-active additional control link and the wind turbine generator set frequency deviation-active additional control link do not work on slight frequency change;
by an amplification factor K 1 And K is equal to 2 Setting, namely realizing the amplitude control of the wind turbine generator system frequency differentiation-active additional control link and the wind turbine generator system frequency deviation-active additional control link on the system inertia support;
the response of the wind turbine generator frequency differential-active additional control link to the noise signal is eliminated by selecting the function 1 and the parameter setting, so that the accuracy of inertia control is improved; by selecting the function 2 and setting parameters, the frequency deviation-active additional control link of the wind turbine generator only plays a role in the frequency dynamic change process, but does not respond to the frequency steady-state process, so that the equivalent moment of inertia of the system is increased, and the problems of secondary power drop and the like caused by utilizing the transitional release of the kinetic energy of the rotor are avoided.
Specifically, the step 101 includes:
determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
and determining the output power of the wind turbine by utilizing the frequency modulation active power of the wind turbine.
Specifically, the determining the frequency modulation active power of the wind turbine generator set according to the real-time frequency of the power grid includes:
when f'>f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 1 +△P 2 ；
When f'>f s1 And Deltaf<f s2 At the time, deltaP W ＝△P 1 ；
When f'<f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 2 ；
When f'<f s1 And Deltaf<f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; deltaP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; deltaP 2 Frequency modulation active power of a wind turbine generator system frequency deviation-active additional control link; deltaP W The frequency modulation active power of the wind turbine generator is obtained.
In the optimal embodiment of the invention, dead zone threshold parameter setting determines the degree of participation of a wind turbine generator set frequency differential-active additional control link and a wind turbine generator set frequency deviation-active additional control link in system inertia control; if the dead zone threshold value 1 parameter is set too large, the wind turbine cannot respond to the severe change of the system frequency in time, and if the dead zone threshold value is set too small, the wind turbine responds to slight system frequency fluctuation, so that the wind turbine frequently participates in the inertia control of the system, and the mechanical load and fatigue of the wind turbine are not facilitated;
the dead zone threshold 1 is typically between 0.1Hz/s and 0.5Hz/s depending on the actual grid fault characteristics, and may be specifically selected depending on the actual grid frequency fault characteristics.
The dead zone threshold 2 parameter is set by considering the dead zone threshold of the primary frequency modulation action frequency of the conventional unit, and the wind turbine generator has high response speed and is required to actively support the frequency change of the system before the active power of other units of the system responds, so that the dead zone threshold is smaller than that of the conventional hydrothermal power unit, and the dead zone threshold is usually 0.01 Hz-0.03 Hz.
Specifically, the frequency modulation active power DeltaP of the frequency differentiation-active additional control link of the wind turbine generator is determined according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
wherein omega c The value is between 6.28 and 62.8rad/s, and the larger the noise interference is, the lower the cut-off frequency value is; q is 0.5-1, and is usually 0.707 to avoid excessive resonance peak; a is that 0 The value is usually 1; in order to avoid triggering the rotation speed protection of the wind turbine due to improper release of the kinetic energy of the rotor, the rotor kinetic energy is utilized to the maximum extent to slow down the frequency change rate, and the rotation speed protection parameters are respectively omega min ＝0.75pu，ω max =1.25pu, wind turbine generator frequency differential term-active power control link amplification factor K 1 Take on a value between 10 and 100, usually take on a value K 1 ＝50；
In the optimal embodiment of the invention, a high-frequency noise signal is easily introduced in the frequency differentiation term calculation process, so that the output power of the wind turbine generator frequency differentiation-active additional control link contains a high-frequency component, and the stable control of the active power of the wind turbine generator and the control of the load of the wind turbine generator are not facilitated. Based on the method, a selection function 1 is added to the wind turbine generator frequency differential-active additional control link, high-frequency noise in output power of the wind turbine generator frequency differential-active additional control link is filtered, stable control of the wind turbine generator frequency differential-active additional control link is achieved, and the system frequency is prevented from changing too fast.
The selection function 1 of the wind turbine generator frequency differential-active additional control link can select 1-order and 2-order to n-order low-pass filter functions, and the attenuation speed of the 2-order low-pass filter function above the cut-off frequency is superior to that of the 1-order low-pass filter function because the parameter design of the high-order low-pass filter function is complex, so that the 2-order low-pass filter function can be selected.
The selection function 1 of the wind turbine generator frequency differential-active additional control link can be:
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
Wherein K is 2 The amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
wherein omega c The value is between 6.28 and 62.8rad/s, and the larger the noise interference is, the lower the cut-off frequency value is; q is 0.5-1, and is usually 0.707 to avoid excessive resonance peak; a is that 0 The value is usually 1; in order to avoid impact on the system caused by simultaneous withdrawal of the frequency differential term and the deviation term control, the deviation term rotation speed protection control is coordinated and matched with the frequency differential term, and a gradual withdrawal mode is adopted, so that the rotation speed protection parameter is different from the differential term and is omega min ＝0.8pu，ω max =1.2pu, frequency deviation term amplification factor K 2 The value is between 10 and 50Usually take the value K 2 ＝20；
In the optimal embodiment of the invention, under the conditions that the kinetic energy of the rotor of the wind turbine is very limited and no other standby energy is coordinated, only the kinetic energy of the rotor of the wind turbine is utilized to provide long-time primary frequency modulation service, thus the secondary power drop is necessarily caused, and the frequency stabilization of a power system is not facilitated. Therefore, the improvement of the frequency steady-state deviation can be abandoned, and the contribution of wind power to the equivalent rotational inertia of the system is considered; the change of the output power of the wind turbine generator can increase the equivalent rotational inertia provided by wind power for the system, further reduce the difference between the actual frequency and the standard frequency of the system, prevent the excessively rapid change of the frequency, slow down the rate of the change of the frequency, promote the low point of the change of the frequency of the system, provide more reaction time for primary frequency modulation of the conventional wind turbine generator, and reduce the severity of the frequency faults of the power grid.
And a selection function 2 is added in the frequency deviation-active additional control link of the wind turbine generator, so that the frequency deviation control does not act on the frequency steady-state process, only the dynamic change process of the frequency is responded, and the kinetic energy of the limited rotor is utilized to the maximum extent to prevent the rapid change of the frequency. Based on the frequency deviation additional control item selection function 2 can select 1-order and 2-order up to n-order high-pass filter functions, and similarly, as the high-order high-pass filter function parameter design is complex, the attenuation speed of the 2-order high-pass filter function below the cut-off frequency is better than that of the 1-order high-pass filter function, the 2-order high-pass filter function can be selected, and after the 2-order high-pass filter function, the wind turbine generator frequency deviation-active additional control link only responds to the frequency dynamic change process, but does not respond to the frequency steady-state value;
the selection function 2 of the wind turbine generator frequency deviation-active additional control link may be:
the frequency deviation Δf of the grid is determined as follows:
△f＝f-f r
wherein f r Is a parameter of the power gridThe frequency is examined.
Further, the determining the output power of the wind turbine generator by using the frequency modulation active power of the wind turbine generator includes:
and determining the output power P of the wind turbine generator according to the following formula:
P＝△P W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
In the optimal embodiment of the invention, the wind turbine is operated under the condition of no power reserve and external energy storage (compared with the control method of the wind turbine participating in the primary frequency modulation of the system, the method has no loss of capturing wind energy), so that the wind power generation income is not influenced, and meanwhile, the reasonable utilization of the limited rotor kinetic energy of the wind turbine is realized, the wind turbine does not participate in the primary frequency modulation of the system, the problem of secondary power drop caused by the primary frequency modulation by utilizing the rotor kinetic energy is effectively avoided, and the frequency stability performance of the high-proportion wind power system is enhanced;
in the optimal embodiment of the invention, a wind turbine generator frequency differential-active additional control link and a wind turbine generator frequency deviation-active additional control link are added to a wind turbine generator converter control system. The method comprises the steps of detecting the change rate and deviation of the frequency of a power grid through a wind turbine generator converter, generating a power instruction according to a wind turbine generator active power control algorithm based on virtual inertia, and simultaneously realizing the rapid control of the electromagnetic torque of a generator according to the power instruction, so that the rapid throughput of the kinetic energy of a rotor of the wind turbine generator is realized, and the purpose of improving the equivalent rotational inertia of the system is achieved. The implementation mode is characterized in that the inertia response speed is high, and the complete response time can be better than 100ms because the wind turbine generator system frequency differentiation-active additional control link and the wind turbine generator system frequency deviation-active additional control link are all completed in the variable flow system.
As shown in fig. 3, (a) - (e) are graphs of the system frequency, the rotational speed of the wind turbine, the active power output by the wind farm, the active power output by the frequency deviation-active additional control link, and the active power output by the frequency differentiation-active additional control link, respectively, when the load step increases, in which the black solid line and the long dashed line represent the system response characteristics when the wind power is not performed and the control of the present invention is performed, and the stippled line and the short dashed line represent the system response characteristics when the wind power is performed with the frequency deviation-active additional control and the frequency differentiation-active additional control.
As shown in fig. 4, (a) - (c) are graphs of system load fluctuation, system frequency and wind farm output active power change when the load continuously changes, in which (b) and (c) black solid line and long-dashed line curves represent system response characteristics under the condition that wind power is not under control of the present invention, respectively, and stippled line and short-dashed line curves represent system response characteristics under the condition that wind power is subjected to frequency deviation-active additional control and frequency differentiation-active additional control, respectively.
As can be seen from fig. 3 and fig. 4, the active power control method of the wind turbine generator can improve the anti-interference capability of the system for resisting rapid changes of power supply and load and the frequency stability of the high-proportion wind power system.
The invention provides a wind turbine generator power control system based on virtual inertia simulation, as shown in fig. 5, the system comprises:
and a determination module: the method comprises the steps of determining output power of a wind turbine generator according to real-time frequency of a power grid;
and an adjusting module: the method is used for adjusting the real-time output power of the wind turbine generator to be the output power of the wind turbine generator.
Specifically, the determining module includes:
a first determination unit: the frequency modulation active power generation device is used for determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
a second determination unit: the method is used for determining the output power of the wind turbine by utilizing the frequency modulation active power of the wind turbine.
Specifically, the first determining unit is configured to:
when f'>f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 1 +△P 2 ；
When f'>f s1 And Deltaf<f s2 At the time, deltaP W ＝△P 1 ；
When f'<f s1 And Deltaf>f s2 At the time, deltaP W ＝△P 2 ；
When f'<f s1 And Deltaf<f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; deltaP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; deltaP 2 Frequency modulation active power of a wind turbine generator system frequency deviation-active additional control link; deltaP W The frequency modulation active power of the wind turbine generator is obtained.
Specifically, the frequency modulation active power DeltaP of the frequency differentiation-active additional control link of the wind turbine generator is determined according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
In the method, in the process of the invention,K 2 the amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
the frequency deviation Δf of the grid is determined as follows:
△f＝f-f r
wherein f r Is the reference frequency of the power grid.
Specifically, the second determining unit is configured to:
and determining the output power P of the wind turbine generator according to the following formula:
P＝△P W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (2)
1. The wind turbine generator power control method based on virtual inertia simulation is characterized by comprising the following steps of:
determining the output power of the wind turbine generator according to the real-time frequency of the power grid;
adjusting the real-time output power of a wind turbine generator to be the output power of the wind turbine generator;
the determining the output power of the wind turbine generator according to the real-time frequency of the power grid comprises the following steps:
determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
determining the output power of the wind turbine by utilizing the frequency modulation active power of the wind turbine;
the method for determining the frequency modulation active power of the wind turbine generator set according to the real-time frequency of the power grid comprises the following steps:
when f' > f s1 And Δf > f s2 At the time, deltaP W ＝ΔP 1 +ΔP 2 ；
When f' > f s1 And Δf < f s2 At the time, deltaP W ＝ΔP 1 ；
When f' < f s1 And Δf > f s2 At the time, deltaP W ＝ΔP 2 ；
When f' < f s1 And Δf < f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; ΔP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; ΔP 2 Frequency modulation active addition for the wind turbine generator frequency deviation-active addition control link; ΔP W Frequency modulation active power addition for the wind turbine generator;
determining the frequency modulation active power delta P of the frequency differentiation-active additional control link of the wind turbine generator set according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
Wherein K is 2 The amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
the frequency deviation Δf of the grid is determined as follows:
Δf＝f-f r
wherein f r Is the reference frequency of the power grid;
the determining the output power of the wind turbine generator by using the frequency modulation active power of the wind turbine generator comprises the following steps:
and determining the output power P of the wind turbine generator according to the following formula:
P＝ΔP W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
2. Wind turbine generator system power control system based on virtual inertia simulation, characterized in that the system comprises:
and a determination module: the method comprises the steps of determining output power of a wind turbine generator according to real-time frequency of a power grid;
and an adjusting module: the method comprises the steps of adjusting real-time output power of a wind turbine to be the output power of the wind turbine;
the determining module includes:
a first determination unit: the frequency modulation active power generation device is used for determining the frequency modulation active power of the wind turbine generator according to the real-time frequency of the power grid;
a second determination unit: the method comprises the steps of determining output power of a wind turbine by utilizing frequency modulation active power of the wind turbine;
the first determining unit is configured to:
when f' > f s1 And Δf > f s2 At the time, deltaP W ＝ΔP 1 +ΔP 2 ；
When f' > f s1 And Δf < f s2 At the time, deltaP W ＝ΔP 1 ；
When f' < f s1 And Δf > f s2 At the time, deltaP W ＝ΔP 2 ；
When f' < f s1 And Δf < f s2 At the time, deltaP W ＝0；
Wherein f' is the differentiation of the grid frequency; Δf is the frequency deviation of the grid; f (f) s1 Dead zone frequency of a frequency differential-active additional control link of the wind turbine generator; f (f) s2 Dead zone frequency of a control link is added for frequency deviation-active power of the wind turbine generator; ΔP 1 Frequency modulation active power of a frequency differentiation-active additional control link of the wind turbine generator; ΔP 2 Frequency modulation active power of a wind turbine generator system frequency deviation-active additional control link; ΔP W The frequency modulation active power of the wind turbine generator is used;
determining the frequency modulation active power delta P of the frequency differentiation-active additional control link of the wind turbine generator set according to the following formula 1 ：
Wherein K is 1 The amplification factor of a differential term in the frequency differential-active additional control link of the wind turbine generator; a is that 0 Zero frequency gain of the filter; omega c Is the cut-off frequency of the filter; s is the Laplace operator; q is the quality factor of the filter; f is the real-time frequency of the power grid; omega min The minimum rotation speed protection parameter of the wind turbine generator is set; omega max The maximum rotation speed protection parameter of the wind turbine generator is set; omega is the rotating speed of the wind turbine generator;
determining the frequency modulation active power delta P of the wind turbine generator frequency deviation-active additional control link according to the following formula 2 ：
Wherein K is 2 The amplification factor of a deviation term in the frequency modulation active power of the wind turbine generator frequency deviation-active additional control link is used; Δf is the frequency deviation of the grid;
the frequency deviation Δf of the grid is determined as follows:
Δf＝f-f r
wherein f r Is the reference frequency of the power grid;
the second determining unit is configured to:
and determining the output power P of the wind turbine generator according to the following formula:
P＝ΔP W +P MPPT
wherein DeltaP W The frequency modulation active power of the wind turbine generator is used; p (P) MPPT And the output power is the output power when the maximum power of the wind turbine generator is tracked.
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