CN115912397A - Wind storage coordinated frequency modulation control method, system and equipment for double-fed wind turbine generator - Google Patents
Wind storage coordinated frequency modulation control method, system and equipment for double-fed wind turbine generator Download PDFInfo
- Publication number
- CN115912397A CN115912397A CN202211457161.4A CN202211457161A CN115912397A CN 115912397 A CN115912397 A CN 115912397A CN 202211457161 A CN202211457161 A CN 202211457161A CN 115912397 A CN115912397 A CN 115912397A
- Authority
- CN
- China
- Prior art keywords
- wind turbine
- turbine generator
- fed wind
- frequency modulation
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000003990 capacitor Substances 0.000 claims abstract description 79
- 230000004044 response Effects 0.000 claims abstract description 42
- 230000008859 change Effects 0.000 claims abstract description 27
- 238000004146 energy storage Methods 0.000 claims description 33
- 238000004590 computer program Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- 230000033228 biological regulation Effects 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 6
- 230000006870 function Effects 0.000 description 23
- 238000011217 control strategy Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 13
- 230000009467 reduction Effects 0.000 description 12
- 230000008901 benefit Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000008093 supporting effect Effects 0.000 description 7
- 238000010248 power generation Methods 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000011022 operating instruction Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Wind Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a wind storage coordinated frequency modulation control method, system and product for a doubly-fed wind turbine generator. The method comprises the following steps: when the load state is a sudden change state, when the rotor rotating speed is less than the minimum rotor rotating speed, the double-fed wind turbine generator is enabled to release or absorb the rotor kinetic energy, inertia response power is provided for the system until the current frequency deviation of the system is equal to 0, and the inertia response is determined to be finished; when the rotating speed is not less than the minimum rotating speed of the rotor, determining that the double-fed wind turbine generator does not participate in frequency modulation; when the current frequency deviation is less than 0.033Hz, judging whether the charge state of the super capacitor is less than the minimum charge state; if the current is less than the preset value, starting the super capacitor and providing primary frequency modulation power for the system; if the current frequency deviation is not less than 0.033Hz or the charge state is not less than the minimum charge state, the super capacitor is not started; and when the load state is a stable state, the double-fed wind turbine generator is operated at the maximum power tracking point, and the super capacitor is not started. The invention can provide long-time active support and meet the requirement of primary frequency modulation.
Description
Technical Field
The invention relates to the field of wind turbine power generation grid connection, in particular to a wind storage coordinated double-fed wind turbine generator frequency modulation control method, system and device.
Background
Wind power is used as a main force for new energy power generation, the installed capacity of China reaches 30 ten thousand MW by the end of 2021, and the world first of newly increased installed capacity is continuously maintained for 12 years. The problem of safety and stability of the power system caused by the wind power integration is particularly important in the face of large-scale installed capacity. A Doubly-Fed Induction Generator (DFIG) is one of the most widely used wind power generation models, and is connected to a power grid through a rotor-side converter and a grid-side converter, and the rotor speed of the DFIG is decoupled from the system frequency and generally operates in a maximum power tracking state. Although the traditional decoupling control of the doubly-fed wind generator realizes the maximization of wind energy utilization, when power fluctuation occurs to a power grid, the kinetic energy of a rotor of the doubly-fed wind generator is hidden, active support cannot be provided for the power grid like a conventional synchronous generator, the stability of the system is reduced, and the frequency safety problem is easily caused.
Aiming at the problem of frequency modulation caused by fan grid connection, scholars at home and abroad carry out a great deal of research and provide frequency modulation strategies such as virtual inertia control, overspeed load shedding control, variable pitch angle control and the like, but the virtual inertia control support mode is adopted to effectively inhibit the system frequency fluctuation, but cannot provide long-time active support so as to meet the primary frequency modulation requirement; the long-time frequency modulation function of the fan is realized by adopting the control modes of overspeed and variable pitch load shedding, but the defect exists, and the maximum power tracking can not be realized in the normal state of overspeed load shedding, so that part of wind power resources are wasted; the pitch angle is frequently adjusted to cause abrasion of a mechanical device and reduce the service life of the variable-pitch load reduction device.
Disclosure of Invention
The invention aims to provide a wind-storage coordinated frequency modulation control method, system and equipment for a doubly-fed wind turbine generator, and aims to solve the problems that a virtual inertia control strategy cannot provide primary frequency adjustment support, an overspeed load shedding control strategy is limited in rotating speed adjustment range, and power generation benefits are reduced.
In order to achieve the purpose, the invention provides the following scheme:
a wind storage coordinated frequency modulation control method for a double-fed wind turbine generator comprises the following steps: a double-fed wind turbine generator and a super capacitor;
acquiring the load state of a frequency modulation system of the double-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt state comprises an abrupt increase state and an abrupt decrease state;
when the load state is a sudden change state, judging whether the rotor rotating speed of the doubly-fed wind turbine generator is less than the minimum rotor rotating speed or not, and judging whether the current frequency deviation of a frequency modulation system of the doubly-fed wind turbine generator is less than 0.033Hz or not;
when the rotor rotating speed of the double-fed wind turbine generator is smaller than the minimum rotor rotating speed, enabling the double-fed wind turbine generator to release or absorb rotor kinetic energy and provide inertia response power for a frequency modulation system of the double-fed wind turbine generator;
calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator in real time until the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator is equal to 0, and determining that the inertia response is finished and the rotating speed of the rotor is restored to the initial value;
when the rotor rotating speed of the double-fed wind turbine generator is not less than the minimum rotor rotating speed, determining that the double-fed wind turbine generator does not participate in frequency modulation;
when the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is smaller than 0.033Hz, judging whether the charge state of the super capacitor is smaller than the minimum charge state;
if the charge state is smaller than the minimum charge state, starting the super capacitor, providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation;
if the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is not less than 0.033Hz or the state of charge is not less than the minimum state of charge, not starting the super capacitor;
and when the load state is a stable state, the double-fed wind turbine generator is operated at the maximum power tracking point, and the super capacitor is not started.
Optionally, the rotor kinetic energy released by the doubly-fed wind turbine generator set in the process of adjusting the rotor speed is as follows:
wherein, delta E k Is the released kinetic energy of the rotor; e 1 To adjust the kinetic energy of the rotor; e 2 Is the adjusted kinetic energy of the rotor; j is the equivalent moment of inertia of the double-fed wind turbine generator; omega 1 The rotor speed before adjustment; omega 2 The adjusted rotor speed; n is 1 Is omega 1 A lower wind speed; n is 2 Is omega 2 A lower wind speed; and N is the gear box transformation ratio.
Optionally, the energy storage device is selected according to the output power of the rotor side of the doubly-fed wind turbine generator and the output power flowing into the grid-side converter.
Optionally, in the frequency modulation process of the double-fed wind turbine generator and the energy storage device, the active power reference value of the rotor side of the double-fed wind turbine generator is as follows:
wherein, P R_ref The active power reference value of the rotor side of the double-fed wind turbine generator is obtained; p is MPPT Is the maximum output power; k H Is the inertia response coefficient;
calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator;
the active power reference value of the energy storage device converter is as follows:
P C_ref ＝K D Δf；
wherein, P C_ref Is an active power reference value, K, of the super capacitor converter D Is a primary frequency modulation response coefficient; and delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
A wind stores up harmonious double-fed wind turbine generator system frequency modulation control system includes: a double-fed wind turbine generator and a super capacitor;
the load state acquisition module is used for acquiring the load state of the frequency modulation system of the double-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt state comprises an abrupt increase state and an abrupt decrease state;
the first judging module is used for judging whether the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed or not and judging whether the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is less than 0.033Hz or not when the load state is the sudden change state;
the frequency modulation module of the double-fed wind turbine generator is used for enabling the double-fed wind turbine generator to release or absorb kinetic energy of a rotor when the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed, and providing inertia response power for the frequency modulation system of the double-fed wind turbine generator;
the frequency modulation finishing module of the double-fed wind turbine generator is used for calculating the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator in real time until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that the inertia response is finished, and recovering the rotating speed of the rotor to an initial value;
the double-fed wind turbine generator non-participation frequency modulation determining module is used for determining that the double-fed wind turbine generator does not participate in frequency modulation when the rotor rotating speed of the double-fed wind turbine generator is not less than the minimum rotor rotating speed;
the second judging module is used for judging whether the charge state of the super capacitor is smaller than the minimum charge state or not when the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is smaller than 0.033Hz;
the primary frequency modulation module is used for starting the super capacitor and providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator if the charge state is smaller than the minimum charge state until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation;
the non-starting super capacitor determining module is used for not starting the super capacitor if the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is not less than 0.033Hz or the charge state is not less than the minimum charge state;
and the maximum power tracking point operation module is used for enabling the double-fed wind turbine generator to operate at a maximum power tracking point without starting the super capacitor when the load state is a stable state.
Optionally, the rotor kinetic energy released by the doubly-fed wind turbine generator set in the process of adjusting the rotor speed is as follows:
wherein, delta E k Is the released kinetic energy of the rotor; e 1 Is the kinetic energy of the rotor before adjustment; e 2 The adjusted kinetic energy of the rotor; j is the equivalent moment of inertia of the double-fed wind turbine generator; omega 1 The rotor speed before adjustment; omega 2 Is the adjusted rotor speed; n is 1 Is omega 1 The wind speed; n is 2 Is omega 2 A lower wind speed; and N is the gear box transformation ratio.
Optionally, the energy storage device is selected according to the output power of the rotor side of the doubly-fed wind turbine generator and the output power flowing into the grid-side converter.
Optionally, in the frequency modulation process of the double-fed wind turbine generator and the energy storage device, the active power reference value of the rotor side of the double-fed wind turbine generator is as follows:
wherein, P R_ref For the active power reference value of the rotor side of the doubly-fed wind turbine；P MPPT Is the maximum output power; k H Is the inertia response coefficient;
calculating the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator;
the active power reference value of the energy storage device converter is as follows:
P C_ref ＝K D Δf；
wherein, P C_ref Is an active power reference value, K, of the super capacitor converter D Is a primary frequency modulation response coefficient; and delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
An electronic device comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic device to execute the wind storage coordinated frequency modulation control method for the doubly-fed wind turbine generator.
A computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the method for controlling frequency modulation of a doubly-fed wind turbine generator with wind power storage coordination is implemented.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a wind storage coordinated frequency modulation control method, system and equipment for a double-fed wind turbine generator, based on inertia and primary frequency modulation control strategies of the double-fed wind turbine generator, the double-fed wind turbine generator is used for releasing or absorbing rotor kinetic energy to provide inertia power support and super capacitor response primary frequency adjustment, and the grid-connected frequency modulation capability of the double-fed wind turbine generator is realized together by coordinately controlling two energy sources of the super capacitor and the rotor kinetic energy of the double-fed wind turbine generator;
in addition, the system frequency fluctuation is dynamically identified, the requirement that the fan actively participates in system frequency regulation is met, and during the steady-state operation, the doubly-fed wind turbine generator always operates in the maximum power tracking state, so that the maximum wind energy utilization is ensured, and the economic benefit of the system is improved; the pitch angle does not need to be frequently adjusted, so that the abrasion of a mechanical device is avoided, and the service life of the mechanical device is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of a frequency modulation control method for a wind-storage coordinated double-fed wind turbine generator set provided by the invention;
fig. 2 is a graph of a current frequency deviation amount of the frequency modulation system of the doubly-fed wind turbine generator and a system frequency change rate provided by the invention; fig. 2 (a) is a graph of a current frequency deviation amount of the frequency modulation system of the doubly-fed wind turbine generator set according to the present invention versus time; FIG. 2 (b) is a graph of the frequency change rate of the system according to the present invention versus time;
FIG. 3 is a block diagram of a system inertia control strategy provided by the present invention;
FIG. 4 is a graph illustrating the operation of the overspeed load shedding control strategy provided by the present invention;
FIG. 5 is a model diagram of a doubly-fed wind turbine generator transmission system provided by the present invention;
FIG. 6 is a diagram of a configuration model of a super capacitor provided by the present invention;
fig. 7 is a block diagram of a wind storage coordination control strategy provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a wind storage coordinated double-fed wind turbine generator frequency modulation control method, system and equipment, which can provide long-time active support, meet the requirement of primary frequency modulation, improve the economic benefit of the system and prolong the service life of a mechanical device.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In recent years, with the rapid development of energy storage technology, an energy storage device is widely applied to wind power generation, and the energy storage device adopting a super capacitor completely bears inertia and primary frequency modulation functions, so that the active frequency modulation function of a fan is realized on the basis of not changing the existing control scheme of the fan. The energy storage device provides possibility for solving the wind power frequency modulation problem in consideration of the advantages of the energy storage device in energy density and response speed. However, if wind energy storage can be combined and coordinately controlled, the hidden kinetic energy of the fan can be fully utilized, the advantage of sufficient energy of the energy storage device can be exerted, the capacity of the energy storage equipment is effectively reduced, and the maximization of the power generation benefit is realized.
Example one
During the frequency adjustment, the wind-storage coordinated frequency modulation control method for the doubly-fed wind turbine generator is shown in fig. 1, and fig. 1 is a flow chart of the wind-storage coordinated frequency modulation control method for the doubly-fed wind turbine generator provided by the invention, as shown in fig. 1, wherein w rmin In order to minimize the rotational speed of the rotor,
for calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator, namely the variation of the frequency, df is the frequency change in a certain period of time, dt is the period of time, SOC is the state of charge, SOC is min Is at a minimum state of charge.
A wind storage coordinated frequency modulation control method for a double-fed wind turbine generator comprises the following steps: double-fed wind turbine generator system and ultracapacitor system.
step1: acquiring a load state of a frequency modulation system of the doubly-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt state comprises an abrupt increase state and an abrupt decrease state; executing step2 and step3 when the load state is an abrupt change state; when the load state is a steady state, step10 is performed.
The distinction and the connection between the virtual inertia and the primary frequency modulation are as follows:
aiming at the problem of reduction of system equivalent inertia caused by grid connection of a double-fed wind turbine generator, the advantages and the defects of a virtual inertia control strategy are analyzed; in order to realize the primary frequency modulation power of the double-fed wind turbine generator, an overspeed load reduction control strategy is analyzed, and the energy requirement of primary frequency modulation is met by reducing the mode of capturing wind energy/reserving active power by a fan.
Inertia reflects the resistance degree of the unit to the change of the system frequency state, and is the kinetic energy E of the rotor of the unit at synchronous angular velocity k And system rated capacity S N The ratio of the two is generally expressed by an inertia time constant H:
wherein J is the moment of inertia, w r The number of rotor revolutions is p, and the number of unit pole pairs is p.
The inertia is closely related to the speed of the unit, which in turn is coupled to the system frequency. When the frequency fluctuates, if the mechanical power of the unit is kept unchanged, the kinetic energy of the rotor is output in the form of electromagnetic power, and the power P is H Frequency fluctuation is restrained, and an inertia supporting effect is achieved.
In the formula (f) N For a rated frequency, P N The rated power of the unit.
Primary frequency modulation is to automatically increase or reduce electromagnetic power output of a unit under system control to deal with system frequency disturbance, and unit regulation power K is generally used G And (4) performing representation.
In the formula,. DELTA.P G And the delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
Power P for inertia response H The system frequency differential quantity is in direct proportion, and the differential has the characteristic of advanced regulation, so that when the frequency of the power grid fluctuates, inertia supporting power is released or absorbed firstly, and the response speed is high. In addition, the inertia supports the power response at the rate of change of frequency, so even if the frequency has not yet returned to nominal, the inertia will no longer function as long as the frequency no longer fluctuates. Therefore, the response time is not long, and is generally about 5 s. Comparing the curves of the grid frequency deviation and the frequency change rate in fig. 2, it can be seen that the fluctuation amplitude of the initial frequency change rate is larger, the inertia supporting power has more remarkable effect in the initial stage, but the total energy supply is limited due to the short time.
The primary frequency modulation supporting power is in direct proportion to the current frequency deviation amount of the frequency modulation system of the double-fed wind turbine generator, generally, the frequency deviation amount is larger than or equal to +/-0.03 Hz, namely, the frequency deviation amount exceeds the frequency modulation dead zone, and the response speed is slow compared with that of the inertia supporting. The frequency deviation lasts long compared with the frequency change rate, so the system needs to provide the primary frequency modulation supporting power for a long time, which is generally 30s. As can be seen from fig. 3, at the later stage of the frequency fluctuation, the inertia support power is almost zero, the primary frequency modulation effect is more important, and the overall energy requirement is higher due to the long response time.
Aiming at the problem of system equivalent inertia reduction caused by grid connection of a double-fed wind turbine generator, a virtual inertia control strategy of a double-fed fan is analyzed.
Aiming at the problem of system equivalent inertia reduction caused by grid connection of a double-fed wind turbine generator, an improved virtual inertia control strategy is provided, as shown in fig. 3, a frequency control module is added on the basis of maximum power tracking control of the double-fed wind turbine generator, namely, additional active power is introduced into an active power reference value of a rotor side converter through parameters such as the current frequency deviation amount, the frequency change rate, the proportionality coefficient and the differential coefficient of a frequency modulation system of the double-fed wind turbine generator, so that the inertia response characteristic and the damping characteristic of a synchronous generator set are simulated, and the function of actively providing inertia support when the wind turbine generator faces system frequency fluctuation is further realized.
Under the virtual inertia control strategy, the active power reference value P of the rotor side of the doubly-fed wind turbine generator ref Comprises the following steps:
in the formula, P MPPT For maximum output power, Δ P 1 Is inertia response power, Δ P 2 For damping the response power, K 1 Is a differential coefficient, K 2 Is a scaling factor.
Although the virtual inertia control strategy solves the problem of reduction of equivalent inertia of the system caused by wind power integration, the kinetic energy of a rotor of the fan is limited, and power support for one-time frequency adjustment cannot be provided.
In order to realize the primary frequency modulation power of the double-fed wind turbine generator, an overspeed load reduction control strategy is researched, and the energy requirement of primary frequency modulation is met by reducing the mode that a fan captures wind energy/reserves active power.
When no additional frequency modulation strategy is adopted, the double-fed wind turbine generator generally operates in a maximum power tracking mode, maximum power tracking points of the double-fed wind turbine generator at different wind speeds are connected to form a maximum power tracking curve shown in figure 4, and at the moment, the output power of the wind turbine is as follows:
wherein r is the air density, C p Is the coefficient of wind energy conversion,/ opt For optimal tip speed ratio, R is the fan blade radius.
In order to realize the primary frequency modulation function of the double-fed wind turbine generator, an overspeed load reduction control strategy is provided, the boiler heat storage is reserved by analogy to a synchronous generator set, and the energy requirement of primary frequency modulation is met by reducing the modes of wind energy capture of a fan and active power reservation.Under normal working conditions, the overspeed load reduction control strategy does not operate at the maximum power tracking point A any more, but operates at the load reduction point B in a mode of increasing the rotating speed of the rotor, and the active power reserved by the fan is delta P AB And Δ P AB The magnitude depends on the load shedding ratio d%.
When the load is increased to cause system frequency fluctuation, the doubly-fed wind turbine generator moves from a load reduction point B to a maximum power point A under the action of additional power, and the wind energy capture is increased by reducing the rotating speed of the wind turbine generator to make up for the power shortage of the system. When the frequency is restored to the nominal value again, the fan is again operated at the load shedding point B. Under the overspeed load shedding control strategy, the active power reference value at the rotor side of the wind turbine generator is as follows:
the overspeed load shedding control strategy realizes the function of participating in primary frequency regulation after the fan is connected to the grid, but the power value is delta P due to the fact that the fan always runs at a load shedding point under the normal working condition AB The wind energy is in a wind abandoning state, and if the duration is too long, a large amount of wind energy resources are wasted. In addition, because the fan is in an overspeed state, the adjustable range of the rotating speed increasing rate is reduced, and when the load is reduced, the power adjusting range is narrowed, so that the primary frequency modulation capability of the fan is limited.
step2: and judging whether the rotor rotating speed of the doubly-fed wind turbine generator is less than the minimum rotor rotating speed, if so, executing step4, and if not, executing step6.
step3: and judging whether the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator is less than 0.033Hz, if so, executing step7, and if not, executing step9.
step4: and enabling the double-fed wind turbine generator to release or absorb kinetic energy of a rotor, and providing inertia response power for a frequency modulation system of the double-fed wind turbine generator.
step5: and calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator in real time until the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator is equal to 0, determining that inertia response is finished, and recovering the rotating speed of the rotor to an initial value.
step6: and determining that the double-fed wind turbine generator does not participate in frequency modulation.
The energy storage device is matched with a primary frequency modulation control scheme, the kinetic energy of the fan rotor is used as a main energy source of the inertia support, the energy storage device is mainly matched with primary frequency modulation support power, and the grid-connected frequency modulation of the fan is realized through wind storage coordination control.
In consideration of the defects of the traditional virtual inertia control and the overspeed load shedding control and the application of the energy storage device in the field of wind power in recent years, the invention provides a wind storage coordination control scheme to solve the problems of inertia and primary frequency modulation caused by wind turbine grid connection. The energy of the inertia of the reference synchronous generator set is derived from the kinetic energy of the rotor, the energy of primary frequency modulation is derived from the reserved heat storage of the boiler, the invention provides inertia response power by utilizing the kinetic energy of the rotor of the fan, the energy storage device provides primary frequency modulation supporting power, and the grid-connected frequency modulation of the fan is realized together through wind-storage coordination.
If the kinetic energy of the rotor of the fan is used as an energy source of the inertia support, the frequency modulation capability of the rotor kinetic energy needs to be analyzed. The rotor kinetic energy of the doubly-fed wind turbine generator is mainly stored in a transmission system-shafting part and consists of blades, a low-speed shaft, a gear box, a high-speed shaft and a generator, as shown in fig. 5. The rotational inertia of the blade and the generator is far greater than that of the transmission shaft, so that an equivalent two-mass model is often adopted when a shafting part is modeled, and therefore the following formula is adopted when the equivalent rotational inertia J of the doubly-fed wind turbine generator is calculated:
J＝J turb +J gear +J gen N 2
in the formula, J turb Is the moment of inertia of the blade, J gen Is the generator moment of inertia, J gear Is the moment of inertia of the gearbox and N is the gearbox transformation ratio.
Rotor rotating speed of doubly-fed wind turbine generator set from w 1 Is adjusted to w 2 The kinetic energy of the rotor released in the process is:
wherein, delta E k Is the released kinetic energy of the rotor; e 1 To adjust the kinetic energy of the rotor; e 2 The adjusted kinetic energy of the rotor; j is the equivalent rotational inertia of the double-fed wind turbine generator; omega 1 The rotor speed before adjustment; omega 2 The adjusted rotor speed; n is 1 Is omega 1 A lower wind speed; n is 2 Is omega 2 The wind speed; and N is the gear box transformation ratio.
The kinetic energy of the rotor contained in the fan is closely related to the initial rotating speed of the fan, the rotating speeds of the fan are different under different working conditions, and the kinetic energy of the rotor is greatly different.
Taking a certain 1.5MW and 2MW doubly-fed wind turbine generator as an example, the equivalent inertia moments are 7.5658 × 10 6 kg.m 2 And 14.2X 10 6 kg.m 2 Substituting the fan pole pair number p =2 and the minimum fan rotating speed n =1050r/min into the formula
The rotor kinetic energy contained in the fan at different rotating speeds can be obtained, and the table 1 is a rotating speed frequency modulation energy table of 1.5MW fan rotors and 2MW fan rotors, as shown in the table 1.
TABLE 1
When the doubly-fed wind turbine generator system provides inertia power support for the system at 10% rated power, the inertia response time provided by the wind turbine at different rotating speeds can be obtained, as shown in table 1. Even at a lower rotating speed of 1200r/min, the kinetic energy of the rotors of the 1.5MW and 2MW fans can provide inertia response of not less than 5s, the requirement of a system on fan inertia support is met, but the energy of the fans cannot meet the requirement of 30s time of primary frequency modulation, and therefore the inertia adjustment is provided only by the kinetic energy of the rotors.
step7: and judging whether the charge state of the super capacitor is smaller than the minimum charge state, if so, executing step8, and if not, executing step9.
step8: starting the super capacitor, providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation.
step9: the supercapacitor is not activated.
The mode of the super capacitor is used as a main energy storage device, and the capacity configuration size of the super capacitor under different fan capacities is determined.
The energy storage devices are various in types and different in performance, and in the field of wind power frequency modulation, the energy storage devices which are widely applied are storage batteries and super capacitors. Considering that the energy storage equipment is adopted to simulate the functions of reserving heat storage and completing primary frequency modulation of the system of the synchronous generator set boiler, the frequency fluctuation times of the grid frequency modulation day is frequent, the requirement on the frequency modulation speed of the generator set is high, and the super capacitor is adopted as a primary frequency modulation energy source in combination with the advantages of high cycle times and high response speed of the super capacitor.
The super capacitor is installed at a direct current bus of the doubly-fed wind turbine generator (as shown in fig. 6), and energy of the super capacitor flows to a power grid or a load through the grid-side converter. When the capacity of the super capacitor is configured, not only the function and the function of the super capacitor need to be considered, but also the adaptation degree of the output power of the super capacitor and the grid-side converter needs to be analyzed. Firstly, the function of the super capacitor is to provide a primary frequency modulation power support, and the magnitude of primary frequency modulation output or input power is related to the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator, and numerous documents show that the power regulation value generally does not exceed 10% of the rated power of the generator and the time is 30s. Secondly, when the rated power of the selected supercapacitor is 10% N It is necessary to analyze whether the power flowing into the grid-side converter exceeds its limit.
Power P flowing into the grid-side converter gsc Rotor side output power P of doubly-fed wind turbine generator rsc And super capacitor output power P c Two parts are formed; p rsc The working range of the rotor speed is generally 0.7 pu-1.3 pu, and s varies from-0.3 pu to 0.3 pu. When the slip ratio s = -0.3, the doubly-fed wind turbine generator outputs power P DFIG To rated value, rotor side output power P rsc The maximum is also reached.
P gsc ＝P rsc +P c
If the rated power of the double-fed wind turbine generator is 2MW, the maximum power flowing through the rotor-side converter is 461kW, the maximum output power of the super capacitor is 200kW, and the power flowing into the grid-side converter is 661kW and is smaller than the limit value 703kW of the grid-side converter. Therefore, 150kW multiplied by 30s is taken as the energy configuration of the super capacitor, and the requirement of primary frequency modulation energy can be met, and the power limit of the grid-side converter can also be met.
In addition, in order to ensure the safety and the reliability of the grid-side converter, the output power and the capacity of the super capacitor can be properly reduced for the built wind turbine generator. For a newly-built double-fed wind turbine generator, the rated power of the grid-side converter can be properly increased, and the phenomenon that the power flowing into the grid-side converter exceeds the limit of the grid-side converter is avoided.
step10: and enabling the double-fed wind turbine generator to operate at a maximum power tracking point, and not starting the super capacitor.
According to the wind storage coordinated frequency control strategy, rotor kinetic energy is used for providing short-time frequency support, the energy storage device improves frequency steady state deviation, the frequency adjusting function of the double-fed wind turbine generator is achieved together, under the normal working condition, the double-fed wind turbine generator operates at the maximum power tracking point, and the super capacitor is not started. When the system frequency fluctuates due to sudden increase/decrease of the load, the wind turbine generator stops the change of the system frequency by releasing or absorbing the kinetic energy of the rotor, time is reserved for primary frequency modulation, and the power floating amount of the wind turbine generator is in direct proportion to the frequency change rate. When the frequency deviation exceeds the dead zone of primary frequency modulation, the super capacitor is started, or energy is released to prevent the system frequency from falling down, or energy is absorbed to prevent the frequency from rising, so that the steady-state deviation of the frequency is reduced.
In combination with the difference between inertia and primary frequency modulation, the wind storage coordination control strategy utilizes rotor kinetic energy to provide short-time frequency support, the energy storage device improves frequency steady state deviation, and the frequency regulation function of the doubly-fed wind turbine generator is realized together, and the control block diagram is shown in fig. 7.
Under the normal working condition, the doubly-fed wind turbine generator runs at the maximum power tracking point, and the super capacitor is not started. When the system frequency fluctuates due to sudden increase/decrease of the load, the wind turbine generator stops the change of the system frequency by releasing or absorbing the kinetic energy of the rotor, time is reserved for primary frequency modulation, and the power floating amount of the wind turbine generator is in direct proportion to the frequency change rate. When the frequency deviation exceeds the dead frequency range, the super capacitor is started, or releases energy to prevent the system frequency from falling down, or absorbs energy to prevent the system frequency from rising, so as to reduce the frequency steady-state deviation, during which the residual capacity of the super capacitor is monitored, and the super capacitor is stopped when the residual capacity is lower than the minimum super capacitor capacity, or the super capacitor is stopped when the frequency deviation is zero, namely: when the deviation rate is small, the kinetic energy of the fan rotor is used as an energy source of the inertia support, and when the deviation rate is large, the super capacitor is put into operation. During the period, expressions of active power reference values of the doubly-fed wind turbine generator and the super capacitor are respectively as follows:
P C_ref ＝K D Δf
in the formula, P R_ref Describing the relation between the active power reference value and inertia of the wind turbine generator set for the active power reference value of the rotor-side converter of the doubly-fed wind turbine generator set; k H Is the inertia response coefficient; p C_ref Describing the relation between the active power reference value of the super capacitor and a primary frequency modulation response coefficient for the active power reference value of the super capacitor converter; k D Is a primary frequency modulation response coefficient;
and calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
The economical comparison is carried out on the overspeed load shedding strategy and the wind storage coordination strategy, and the result shows that the cost of the wind storage coordination strategy provided by the invention is far lower than the annual economic loss of the overspeed load shedding scheme.
Compared with a virtual inertia control scheme, the wind storage coordination control strategy only uses rotor kinetic energy to provide inertia support, the problem that the rotor speed drops to the lowest point, the rotor kinetic energy quickly rises after being deeply released, and then the frequency drops for the second time does not exist, and the function requirement of primary frequency modulation of the wind turbine generator can be met. Compared with an overspeed load reduction scheme, the wind storage coordination control strategy always operates at the maximum power tracking point under the normal working condition, so that economic loss caused by abandoned wind is avoided, and the limitation on the speed regulation range is not provided. The only disadvantage is that the installation of the super capacitor increases the investment cost, but still has strong economic advantages, and table 2 is an economy comparison table of an overspeed load shedding strategy and an air storage coordination strategy, as shown in table 2.
TABLE 2
Table 2 compares the economic efficiency of the 2W doubly fed wind turbine under two control schemes. When the load shedding rate is 10%, the overspeed load shedding strategy can cause the electricity charge loss of 50.1 ten thousand per year due to the waste of wind energy resources under the condition of unlimited electricity. When the wind storage coordination strategy is adopted, the super capacitor is arranged at the position of a direct current bus of the wind turbine generator, and the construction cost is not soil, so that only the purchase cost of the super capacitor and the current transformer needs to be paid, and the total cost is 35 ten thousand yuan. If the service life of the super capacitor is 8 years, the depreciation life of the converter is 20 years, 3.625 ten thousand yuan is required to be invested each year, and the cost is far less than the annual economic loss of the overspeed load shedding scheme.
Example two
In order to implement the method corresponding to the above embodiment to achieve the corresponding functions and technical effects, a wind storage coordinated frequency modulation control system for a doubly-fed wind turbine generator is provided below.
A wind stores up harmonious double-fed wind turbine generator system frequency modulation control system includes: double-fed wind turbine generator system and ultracapacitor system.
The load state acquisition module is used for acquiring the load state of the frequency modulation system of the double-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt states include a sudden increase state and a sudden decrease state.
And the first judgment module is used for judging whether the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed or not and judging whether the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is less than 0.033Hz or not when the load state is the sudden change state.
And the frequency modulation module of the double-fed wind turbine generator is used for enabling the double-fed wind turbine generator to release or absorb kinetic energy of the rotor when the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed, and providing inertia response power for the frequency modulation system of the double-fed wind turbine generator.
And the frequency modulation ending module of the double-fed wind turbine generator is used for calculating the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator in real time until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that the inertia response is ended, and restoring the rotating speed of the rotor to the initial value.
And the double-fed wind turbine generator non-participation frequency modulation determining module is used for determining that the double-fed wind turbine generator does not participate in frequency modulation when the rotor rotating speed of the double-fed wind turbine generator is not less than the minimum rotor rotating speed.
And the second judging module is used for judging whether the charge state of the super capacitor is less than the minimum charge state or not when the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is less than 0.033Hz.
The primary frequency modulation module is used for starting the super capacitor and providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator if the charge state is smaller than the minimum charge state until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation.
And the non-starting super capacitor determining module is used for not starting the super capacitor if the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is not less than 0.033Hz or the charge state is not less than the minimum charge state.
And the maximum power tracking point operation module is used for enabling the double-fed wind turbine generator to operate at the maximum power tracking point and not starting the super capacitor when the load state is a stable state.
In practical application, the kinetic energy of the rotor released in the process of adjusting the rotating speed of the rotor by the doubly-fed wind turbine generator set is as follows:
In practical application, the energy storage device is selected according to the output power of the rotor side of the doubly-fed wind turbine generator and the output power flowing into the grid-side converter.
In practical application, in the frequency modulation process of the double-fed wind turbine generator and the energy storage device, the active power reference value of the rotor side of the double-fed wind turbine generator is as follows:
The active power reference value of the energy storage device converter is as follows:
P C_ref ＝K D Δ f; wherein, P C_ref For the active power reference value, K, of the supercapacitor converter D Is a primary frequency modulation response coefficient; and delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
EXAMPLE III
The embodiment of the invention provides electronic equipment which comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic equipment to execute the wind storage coordinated double-fed wind turbine generator frequency modulation control method provided by the embodiment.
In practical applications, the electronic device may be a server.
In practical applications, the electronic device includes: at least one processor (processor), memory (memory), bus, and communication Interface (Communications Interface).
Wherein: the processor, the communication interface, and the memory communicate with each other via a communication bus.
A communication interface for communicating with other devices.
The processor is used for executing the program, and specifically can execute the method described in the above embodiment.
In particular, the program may include program code comprising computer operating instructions.
The processor may be a central processing unit CPU or an Application Specific Integrated Circuit ASIC or one or more Integrated circuits configured to implement embodiments of the present invention. The electronic device includes one or more processors, which may be the same type of processor, such as one or more CPUs; or may be different types of processors such as one or more CPUs and one or more ASICs.
And the memory is used for storing programs. The memory may comprise high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.
Based on the above description of the embodiments, the embodiments of the present application provide a storage medium on which computer program instructions are stored, the computer program instructions being executable by a processor to implement the method described in any of the embodiments
The wind-storage coordinated double-fed wind turbine generator frequency modulation control system provided by the embodiment of the application exists in various forms, including but not limited to:
(1) A mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has mobile internet access performance. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.
(3) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices.
(4) And other electronic equipment with data interaction function.
Thus, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application. As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM),
Digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices
Or any other non-transmission medium, that may be used to store information that may be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular transactions or implement particular abstract data types. The application may also be practiced in distributed computing environments where transactions are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A wind storage coordinated double-fed wind turbine generator frequency modulation control method is characterized by comprising the following steps: a double-fed wind turbine generator and a super capacitor;
acquiring a load state of a frequency modulation system of the doubly-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt state comprises an abrupt increase state and an abrupt decrease state;
when the load state is a sudden change state, judging whether the rotor rotating speed of the doubly-fed wind turbine generator is less than the minimum rotor rotating speed or not, and judging whether the current frequency deviation of a frequency modulation system of the doubly-fed wind turbine generator is less than 0.033Hz or not;
when the rotor rotating speed of the double-fed wind turbine generator is smaller than the minimum rotor rotating speed, enabling the double-fed wind turbine generator to release or absorb rotor kinetic energy and provide inertia response power for a frequency modulation system of the double-fed wind turbine generator;
calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator in real time until the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator is equal to 0, and determining that the inertia response is finished and the rotating speed of the rotor is restored to the initial value;
when the rotor rotating speed of the double-fed wind turbine generator is not less than the minimum rotor rotating speed, determining that the double-fed wind turbine generator does not participate in frequency modulation;
when the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is smaller than 0.033Hz, judging whether the charge state of the super capacitor is smaller than the minimum charge state;
if the charge state is smaller than the minimum charge state, starting the super capacitor, providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation;
if the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is not less than 0.033Hz or the state of charge is not less than the minimum state of charge, not starting the super capacitor;
and when the load state is a stable state, the double-fed wind turbine generator is operated at the maximum power tracking point, and the super capacitor is not started.
2. The frequency modulation control method for the wind-storage coordinated doubly-fed wind turbine generator according to claim 1, wherein kinetic energy of a rotor released in the process of adjusting the rotating speed of the rotor by the doubly-fed wind turbine generator is as follows:
wherein, delta E k Is the released kinetic energy of the rotor; e 1 Is the kinetic energy of the rotor before adjustment; e 2 The adjusted kinetic energy of the rotor; j is the equivalent rotational inertia of the double-fed wind turbine generator; omega 1 The rotor speed before adjustment; omega 2 The adjusted rotor speed; n is 1 Is omega 1 A lower wind speed; n is 2 Is omega 2 A lower wind speed; and N is the gear box transformation ratio.
3. The wind-storage coordinated frequency modulation control method for the doubly-fed wind turbine generator set according to claim 1, characterized in that the energy storage device is selected by the output power of the rotor side of the doubly-fed wind turbine generator set and the output power of the grid-side converter.
4. The wind-storage coordinated frequency modulation control method for the doubly-fed wind turbine generator set according to claim 1, wherein in the frequency modulation process of the doubly-fed wind turbine generator set and the energy storage device, the active power reference value of the rotor side of the doubly-fed wind turbine generator set is as follows:
wherein, P R_ref The active power reference value of the rotor side of the doubly-fed wind turbine generator set is obtained; p MPPT Is the maximum output power; k is H Is the inertia response coefficient;
calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator;
the active power reference value of the energy storage device converter is as follows:
P C_ref ＝K D Δf；
wherein, P C_ref Is an active power reference value, K, of the super capacitor converter D Is a primary frequency modulation response coefficient; and delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
5. The utility model provides a wind stores up harmonious double-fed wind turbine generator system frequency modulation control system which characterized in that includes: a double-fed wind turbine generator and a super capacitor;
the load state acquisition module is used for acquiring the load state of the frequency modulation system of the double-fed wind turbine generator; the load state comprises a steady state and a sudden change state; the abrupt state comprises an abrupt increase state and an abrupt decrease state;
the first judging module is used for judging whether the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed or not and judging whether the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is less than 0.033Hz or not when the load state is the sudden change state;
the frequency modulation module of the double-fed wind turbine generator is used for enabling the double-fed wind turbine generator to release or absorb kinetic energy of a rotor when the rotor rotating speed of the double-fed wind turbine generator is less than the minimum rotor rotating speed, and providing inertia response power for the frequency modulation system of the double-fed wind turbine generator;
the double-fed wind turbine generator frequency modulation finishing module is used for calculating the current frequency deviation of the double-fed wind turbine generator frequency modulation system in real time until the current frequency deviation of the double-fed wind turbine generator frequency modulation system is equal to 0, determining that the inertia response is finished, and recovering the rotor rotating speed to an initial value;
the double-fed wind turbine generator non-participation frequency modulation determining module is used for determining that the double-fed wind turbine generator does not participate in frequency modulation when the rotor rotating speed of the double-fed wind turbine generator is not less than the minimum rotor rotating speed;
the second judging module is used for judging whether the charge state of the super capacitor is smaller than the minimum charge state or not when the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is smaller than 0.033Hz;
the primary frequency modulation module is used for starting the super capacitor and providing primary frequency modulation power for the frequency modulation system of the double-fed wind turbine generator if the charge state is smaller than the minimum charge state until the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is equal to 0, determining that primary frequency modulation is finished, and stopping current operation of the super capacitor; the current operation is a charging operation or a discharging operation;
the non-starting super capacitor determining module is used for not starting the super capacitor if the current frequency deviation of the frequency modulation system of the double-fed wind turbine generator is not less than 0.033Hz or the charge state is not less than the minimum charge state;
and the maximum power tracking point operation module is used for enabling the double-fed wind turbine generator to operate at the maximum power tracking point and not starting the super capacitor when the load state is a stable state.
6. The wind-storage coordinated frequency modulation control system for the doubly-fed wind turbine generator according to claim 1, wherein kinetic energy of the rotor released during the regulation of the rotor speed by the doubly-fed wind turbine generator is as follows:
wherein, delta E k Is the released kinetic energy of the rotor; e 1 Is the kinetic energy of the rotor before adjustment; e 2 The adjusted kinetic energy of the rotor; j is the equivalent moment of inertia of the double-fed wind turbine generator; omega 1 The rotor speed before adjustment; omega 2 The adjusted rotor speed; n is 1 Is omega 1 A lower wind speed; n is 2 Is omega 2 The wind speed; and N is the gear box transformation ratio.
7. The wind-storage coordinated doubly-fed wind turbine generator frequency modulation control system according to claim 1, wherein the energy storage device is selected by the output power of the rotor side of the doubly-fed wind turbine generator and the output power of the grid-side converter.
8. The wind-storage coordinated frequency modulation control system for the doubly-fed wind turbine generator according to claim 1, wherein in the frequency modulation process of the doubly-fed wind turbine generator and the energy storage device, the active power reference value of the rotor side of the doubly-fed wind turbine generator is as follows:
wherein, P R_ref The active power reference value of the rotor side of the doubly-fed wind turbine generator set is obtained; p MPPT Is the maximum output power; k H Is the inertia response coefficient;
calculating the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator;
the active power reference value of the energy storage device converter is as follows:
P C_ref ＝K D Δf；
wherein, P C_ref Is an active power reference value, K, of the super capacitor converter D Is a primary frequency modulation response coefficient; and delta f is the current frequency deviation of the frequency modulation system of the doubly-fed wind turbine generator.
9. An electronic device, comprising a memory for storing a computer program and a processor for executing the computer program to make the electronic device execute the wind storage coordinated doubly-fed wind turbine generator frequency modulation control method according to any one of claims 1-4.
10. A computer-readable storage medium, characterized in that it stores a computer program, which when executed by a processor implements the wind-storage coordinated doubly-fed wind turbine generator frequency modulation control method according to any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211457161.4A CN115912397B (en) | 2022-11-21 | 2022-11-21 | Frequency modulation control method, system and equipment for wind-storage-coordinated double-fed wind turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211457161.4A CN115912397B (en) | 2022-11-21 | 2022-11-21 | Frequency modulation control method, system and equipment for wind-storage-coordinated double-fed wind turbine generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115912397A true CN115912397A (en) | 2023-04-04 |
| CN115912397B CN115912397B (en) | 2024-03-15 |
Family
ID=86478136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211457161.4A Active CN115912397B (en) | 2022-11-21 | 2022-11-21 | Frequency modulation control method, system and equipment for wind-storage-coordinated double-fed wind turbine generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115912397B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111616A (en) * | 2023-04-13 | 2023-05-12 | 清华大学 | Multi-time space scale power system frequency full-track coordination optimization control method |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333037A (en) * | 2014-11-02 | 2015-02-04 | 中国科学院电工研究所 | Cooperative control method for participating in frequency modulation and pressure regulation of power system by wind storage cluster |
| CN105226719A (en) * | 2015-11-09 | 2016-01-06 | 安徽工程大学 | For the energy storage control system of wind power regulation and control |
| CN105449701A (en) * | 2016-01-18 | 2016-03-30 | 华北电力科学研究院有限责任公司 | A method and apparatus for an energy storage system to participate in power grid frequency control |
| CN107453410A (en) * | 2017-09-04 | 2017-12-08 | 上海电力学院 | The double-fed blower fan of load disturbance participates in wind bavin microgrid frequency modulation control method |
| CN108631333A (en) * | 2018-04-27 | 2018-10-09 | 上海电力学院 | A kind of wind storage joint frequency modulation control method based on limit direct torque |
| JP2019115249A (en) * | 2017-12-25 | 2019-07-11 | 赫普科技発展（北京）有限公司 | Method, apparatus, and system for frequency modulation in power grid |
| CN110336304A (en) * | 2019-07-22 | 2019-10-15 | 华北电力大学（保定） | A kind of double-fed fan motor unit primary frequency modulation method based on Variable power point tracking and ultracapacitor energy storage coordinated control |
| CN110611320A (en) * | 2019-07-22 | 2019-12-24 | 华北电力大学（保定） | Double-fed wind turbine generator inertia and primary frequency modulation method based on super capacitor energy storage control |
| CN112332442A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Virtual inertia control strategy optimization based on double-fed wind power plant |
| CN112332440A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Doubly-fed wind turbine generator inertia supporting frequency control method based on rotor kinetic energy |
| CN112332462A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Doubly-fed wind generating set primary frequency smooth adjustment method considering source-load power random fluctuation characteristic |
| CN113541161A (en) * | 2021-09-16 | 2021-10-22 | 湖南大学 | Wind-storage combined frequency modulation coordination control method and energy storage configuration method |
| CN114069653A (en) * | 2021-10-29 | 2022-02-18 | 中国电力科学研究院有限公司 | Wind turbine generator set improved frequency modulation control method and system considering energy storage output mode |
| CN114567002A (en) * | 2022-01-24 | 2022-05-31 | 华能扎赉特旗太阳能光伏发电有限公司科右中旗分公司 | Energy storage double-fed wind generating set and synchronous generator cooperative frequency modulation control method |
-
2022
- 2022-11-21 CN CN202211457161.4A patent/CN115912397B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333037A (en) * | 2014-11-02 | 2015-02-04 | 中国科学院电工研究所 | Cooperative control method for participating in frequency modulation and pressure regulation of power system by wind storage cluster |
| CN105226719A (en) * | 2015-11-09 | 2016-01-06 | 安徽工程大学 | For the energy storage control system of wind power regulation and control |
| CN105449701A (en) * | 2016-01-18 | 2016-03-30 | 华北电力科学研究院有限责任公司 | A method and apparatus for an energy storage system to participate in power grid frequency control |
| CN107453410A (en) * | 2017-09-04 | 2017-12-08 | 上海电力学院 | The double-fed blower fan of load disturbance participates in wind bavin microgrid frequency modulation control method |
| JP2019115249A (en) * | 2017-12-25 | 2019-07-11 | 赫普科技発展（北京）有限公司 | Method, apparatus, and system for frequency modulation in power grid |
| CN108631333A (en) * | 2018-04-27 | 2018-10-09 | 上海电力学院 | A kind of wind storage joint frequency modulation control method based on limit direct torque |
| CN110336304A (en) * | 2019-07-22 | 2019-10-15 | 华北电力大学（保定） | A kind of double-fed fan motor unit primary frequency modulation method based on Variable power point tracking and ultracapacitor energy storage coordinated control |
| CN110611320A (en) * | 2019-07-22 | 2019-12-24 | 华北电力大学（保定） | Double-fed wind turbine generator inertia and primary frequency modulation method based on super capacitor energy storage control |
| CN112332442A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Virtual inertia control strategy optimization based on double-fed wind power plant |
| CN112332440A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Doubly-fed wind turbine generator inertia supporting frequency control method based on rotor kinetic energy |
| CN112332462A (en) * | 2020-08-18 | 2021-02-05 | 华北电力大学（保定） | Doubly-fed wind generating set primary frequency smooth adjustment method considering source-load power random fluctuation characteristic |
| CN113541161A (en) * | 2021-09-16 | 2021-10-22 | 湖南大学 | Wind-storage combined frequency modulation coordination control method and energy storage configuration method |
| CN114069653A (en) * | 2021-10-29 | 2022-02-18 | 中国电力科学研究院有限公司 | Wind turbine generator set improved frequency modulation control method and system considering energy storage output mode |
| CN114567002A (en) * | 2022-01-24 | 2022-05-31 | 华能扎赉特旗太阳能光伏发电有限公司科右中旗分公司 | Energy storage double-fed wind generating set and synchronous generator cooperative frequency modulation control method |
Non-Patent Citations (1)
| Title |
|---|
| 颜湘武等: "基于变功率点跟踪和超级电容器储能协调控制的双馈风电机组一次调频策略", 《电工技术学报》, vol. 35, no. 3, pages 530 - 541 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111616A (en) * | 2023-04-13 | 2023-05-12 | 清华大学 | Multi-time space scale power system frequency full-track coordination optimization control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115912397B (en) | 2024-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | A frequency regulation strategy for wind power based on limited over-speed de-loading curve partitioning | |
| CN112332440B (en) | Doubly-fed wind turbine generator inertia supporting frequency control method based on rotor kinetic energy | |
| Kim et al. | Power smoothing of a variable-speed wind turbine generator in association with the rotor-speed-dependent gain | |
| CN110120677B (en) | Self-adaptive dynamic virtual inertia frequency modulation method for double-fed variable-speed pumped storage unit | |
| CN110071526B (en) | Self-adaptive droop control method for PMSG fan participating in power grid frequency regulation | |
| CN107069799B (en) | The control method and system of double-feedback aerogenerator group | |
| CN106286128A (en) | The system frequency control method of a kind of off-load variable-speed wind-power unit and device | |
| CN112865138B (en) | Energy storage primary frequency modulation control method and device for power system | |
| CN116231734A (en) | Micro-grid wind-storage-load layered cooperative frequency modulation control method | |
| CN115912397B (en) | Frequency modulation control method, system and equipment for wind-storage-coordinated double-fed wind turbine generator | |
| CN115833229A (en) | Primary frequency modulation method of wind storage combined system based on multivariable fuzzy logic control | |
| CN110401222B (en) | Comprehensive control method and system for wind generating set participating in system frequency modulation | |
| CN115714399A (en) | Flywheel energy storage-based wind turbine generator set primary allocation control method | |
| Pinazo et al. | Intermittent power control in wind turbines integrated into a hybrid energy storage system based on a new state-of-charge management algorithm | |
| Akbari et al. | Modeling and control of flywheel-integrated generators in split-shaft wind turbines | |
| CN116545010A (en) | Power generation scheduling method, system and equipment considering flexible climbing constraint of system | |
| Yang et al. | Frequency control scheme with dynamic droop characteristics of a DFIG for mitigating the frequency fluctuations | |
| Cui et al. | Inertia and primary frequency modulation strategy for a doubly fed induction generator based on supercapacitor energy storage control | |
| Liu et al. | The effects of wind turbine and energy storage participating in frequency regulation on system frequency response | |
| CN112290590B (en) | PMSG fan control method based on super-capacitor virtual inertia and short-term primary frequency modulation | |
| CN113904346A (en) | Wind turbine generator rotating speed recovery method considering hydroelectric frequency modulation resources | |
| Wang et al. | An optimal over-frequency droop control for DFIG-based wind farm under unreliable communication | |
| Wang et al. | Coordination Between Wind Turbines and Energy Storage System for Frequency Regulation Participation | |
| Zhai et al. | Frequency response strategy of Wind-storage-PEV collaborated system | |
| CN113131495B (en) | Method and system for setting virtual inertia control parameters of wind turbine generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |