CN116111613B - Control method and system for participating in frequency modulation of power grid system by wind-storage integrated system - Google Patents
Control method and system for participating in frequency modulation of power grid system by wind-storage integrated system Download PDFInfo
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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
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention belongs to the technical field of wind-storage integrated systems, and particularly discloses a control method and a system for participating in frequency modulation of a power grid system by using the wind-storage integrated system, wherein the method comprises the following steps: calculating actual releasable energy of fans participating in system frequency modulation under different wind speed scenes and energy requirements of the fans during primary frequency modulation; and respectively adding droop control instructions to the grid-side converter and the machine-side converter of the fan, wherein the droop coefficient of the machine-side converter of the controller is determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter. According to the invention, through reasonably setting the sagging coefficients of the machine side and the net side and simultaneously releasing the energy storage energy and the rotor kinetic energy, the wind-storage integrated system can support the whole primary frequency modulation process.
Description
Technical Field
The invention relates to the technical field of wind-storage integrated systems, in particular to a control method and a control system for participating in frequency modulation of a power grid system by using the wind-storage integrated system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The permeability of wind power is gradually improved, and from the view point of maintaining the stability of the system, the power grid system has more requirements on the capacity of the wind turbine generator to participate in the active frequency support of the system. The wind turbine generator system is a conventional method for improving the supporting capability of a participating system through additional energy storage. The existing control method for the frequency modulation of the additional energy storage participation system of the direct-driven fan comprises the following steps: according to the frequency change, the output power is respectively regulated in a droop or inertia response mode on the machine side converter and the energy storage side converter so as to realize the regulation of the frequency of the power grid; and respectively adding different frequency instructions to the power control loops of the machine side converter and the energy storage side converter by adopting a specific curve or fuzzy control mode so as to coordinate the wind turbine generator and the energy storage to jointly respond to the frequency change of the power grid and the like.
However, the following technical problems still exist in the prior art:
on the one hand, the prior art is based on the conventional control mode of the wind turbine generator, namely, the machine side converter adopts maximum power tracking control, the grid side converter adopts constant direct current bus voltage control, and the energy storage side converter adopts independent charge and discharge control. However, the control frame cannot directly ensure the controllability of the output power of the integrated system after the wind turbine generator is combined with the energy storage, and a new control frame is needed, namely, the machine side converter adopts maximum power tracking control, the network side converter adopts power instruction control, and the energy storage side converter adopts constant direct current bus voltage control.
On the other hand, the wind turbine generator system and the energy storage control are coordinated without comprehensively considering factors such as wind speed, frequency deviation and the like in the prior art to ensure that the wind turbine generator system supports the whole primary frequency modulation process under different running conditions, so that the problem of secondary frequency drop is avoided.
Disclosure of Invention
In order to solve the problems, the invention provides a control method and a control system for enabling a wind-storage integrated system to participate in the frequency modulation of a power grid system.
In some embodiments, the following technical scheme is adopted:
a control method for a wind-storage integrated system to participate in frequency modulation of a power grid system comprises the following steps:
calculating actual releasable energy of fans participating in system frequency modulation under different wind speed scenes and energy requirements of the fans during primary frequency modulation;
and respectively adding droop control instructions to the grid-side converter and the machine-side converter of the fan, wherein the droop coefficient of the machine-side converter of the controller is determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter.
The droop coefficient of the controller-side converter is specifically:
wherein ,
the actual releasable energy for the fan to participate in the system frequency modulation, +.>
For the energy requirement of the fan during primary frequency modulation, < >>
For controlling the sag factor of the grid-side converter.
In other embodiments, the following technical solutions are adopted:
a control system for a wind-storage integrated system to participate in frequency modulation of a power grid system comprises:
the data calculation module is used for calculating the actual releasable energy of the fans participating in the system frequency modulation under different wind speed scenes and the energy requirement of the fans during primary frequency modulation;
and the frequency modulation control module is used for respectively attaching droop control instructions to the grid-side converter and the machine-side converter of the fan, wherein the droop coefficient of the machine-side converter is controlled to be determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter.
In other embodiments, the following technical solutions are adopted:
a terminal device comprising a processor and a memory, the processor for implementing instructions; the memory is used for storing a plurality of instructions which are suitable for being loaded and executed by the processor, and the wind-storage integrated system participates in the control method of the frequency modulation of the power grid system.
In other embodiments, the following technical solutions are adopted:
a computer readable storage medium, in which a plurality of instructions are stored, said instructions being adapted to be loaded by a processor of a terminal device and to perform a method for controlling a wind energy storage integrated system to participate in a frequency modulation of a grid system as described above.
Compared with the prior art, the invention has the beneficial effects that:
(1) During primary frequency modulation, through reasonably setting sagging coefficients of a machine side and a net side, energy storage energy and rotor kinetic energy are released simultaneously, so that the wind-storage integrated system can support the whole primary frequency modulation process. And along with the increase of wind speed scenes, the kinetic energy of the actually releasable rotor of the fan is increased, and the distributed sagging coefficient is continuously increased, so that the stability of the frequency adjustment capability of the wind storage integrated system and the capability of continuously participating in the whole frequency modulation process of the system can be ensured.
(2) The sagging coefficient of the machine side is set according to the rotor kinetic energy which can be released by the fan actually, so that the rotating speed of the fan is ensured to run in a safe range, and the problem of secondary frequency drop caused by the fact that the rotating speed is too low and the fan exits from frequency modulation during frequency modulation is avoided.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a typical frequency perturbation process;
FIG. 2 is a graph showing wind power captured by a fan during primary frequency modulation in an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an energy requirement evaluation of a fan during primary frequency modulation according to an embodiment of the present invention;
FIG. 4 is a control structure diagram of a wind-storage integrated system according to an embodiment of the present invention;
FIG. 5 is a graph showing the comparison of fan and stored energy release under a dual droop control strategy according to embodiments of the present invention.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Term interpretation:
grid frequency disturbance: under ideal conditions, the wind turbine generator is connected to a power grid through alternating current output of a converter, the power grid frequency is power frequency, namely 50Hz, but the power grid frequency disturbance process occurs when large-scale power electronics are connected to the power grid. Grid frequency disturbances, which may be defined as a fluctuation of frequency, are not able to maintain a 50 Hz. A typical grid frequency disturbance is shown in fig. 1 below.
Sag control: droop control is a linear control method applied to conventional synchronous generators. The droop control of the wind turbine generator is realized by simulating the active-frequency droop characteristic of the synchronous machine, so that the synchronous machine has the capability of participating in system frequency adjustment when the power grid frequency changes.
Wind stores up integration system: the wind-storage integrated system is an integrated system with output being uniformly and coordinately controlled, which is formed by the wind turbine and the energy storage after the distributed energy storage is added on the basis of the traditional wind turbine.
Example 1
By combining the description in the background technology, the requirement of the wind turbine for participating in the system frequency adjustment is continuously improved, and the wind turbine is influenced by the wind speed and the running state of the wind turbine, so that the capability of the wind turbine for participating in the system frequency adjustment is dynamically changed; under a low wind speed or large disturbance scene, the wind turbine generator can exit in the frequency modulation process to cause a serious frequency secondary drop event.
Based on the above, in one or more embodiments, a control method for participating in frequency modulation of a power grid system by a wind-storage integrated system is disclosed, which specifically includes the following steps:
(1) Calculating actual releasable energy of fans participating in system frequency modulation under different wind speed scenes and energy requirements of the fans during primary frequency modulation;
specifically, the general fan operates in a maximum power point tracking (hereinafter referred to as MPPT) mode, i.e., a power peak operating at different wind speeds. In the running process, the fan has larger rotational inertia, and the kinetic energy of the rotor can be released to participate in primary frequency modulation of the system when the system is in active disturbance.
In general, when the rated rotation speed of the fan is
During the process, the fan speed +.>
The range of (2) is:
when the fan operates in the MPPT mode, the calculation formula of the maximum amount of releasable rotor kinetic energy is as follows:
wherein ,
the minimum rotational speed for safe operation of the fan is typically 0.7p.u.
Considering that the rotating speed is reduced during the period of releasing the rotor kinetic energy of the fan, the fan deviates from the MPPT operation point, the captured wind power is reduced, and a part of the rotor kinetic energy released by the fan supplements the energy Eloss lost by the fan due to the deviation from the MPPT operation point. The wind power is continuously reduced during primary frequency modulation, and in order to release the kinetic energy of the rotor as much as possible, the embodiment assumes that the rotation speed at the frequency modulation ending time is the lowest rotation speed of 0.7
。
As shown in fig. 2, the present embodiment assumes wind during primary frequency modulationThe wind power captured by the machine is reduced to the lowest rotating speed of 0.7 at a fixed slope from the maximum power operating point in a period of time t
Corresponding power points, the energy E lost by the fan due to deviation from the MPPT operation point in the frequency modulation time T can be calculated loss And the actual fan captured wind power is always greater than the assumed linearly decreasing power during primary frequency modulation, thus the calculated lost energy E loss Greater than the actual value.
Concrete E loss The calculation formula is as follows:
wherein T is the frequency modulation time,
for the fan speed>
Is the rated rotating speed of the fan.
Actual releasable energy E of fan participation system frequency modulation real Releasable energy E for rotor kmax Subtracting the energy E lost by the fan due to deviation from the MPPT operation point loss The mathematical expression is:
after the system generates active disturbance, the frequency is supported by inertia response and primary frequency modulation firstly until secondary frequency modulation is achieved, namely AGC response is in place (namely the current power disturbance is completely borne by an AGC thermal power unit), and the power supply is required to have enough power and energy to support the frequency for a short time during primary frequency modulation.
In this embodiment, the automatic power generation control AGC (Automatic Generation Control) is an important function in the energy management system EMS, which controls the output of the fm unit to meet the changing customer power requirements. The AGC unit refers to a thermal generator unit.
In this embodiment, the active disturbance of 10% of the system capacity is taken as the maximum possible risk of the system, the AGC unit power starts to increase with a fixed slope at 30s after the fault occurs to simulate the secondary frequency modulation, and the energy requirement of the fan during the primary frequency modulation is estimated, as shown in fig. 3.
Therefore, the energy demand of the fan during primary frequency modulation, namely the trapezoidal area of the energy demand evaluation schematic diagram, is multiplied by the proportion of the generated energy of the fan to the total generated energy of the system, and the calculation formula is as follows:
wherein ,t 1 taking a value of 30s for the AGC starting response time;
taking 10% of the power grid capacity as active disturbance; r is the response growth rate of the AGC.
(2) And respectively adding droop control instructions to the fan grid-side converter and the machine-side converter, wherein the droop coefficient of the control grid-side converter is set according to the energy demand and the lowest point of the maximum expected frequency, and the droop coefficient of the control machine-side converter is determined by the actual releasable energy, the energy demand of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter.
Specifically, in the wind-storage integrated system shown in fig. 4, a machine-side converter (MSC) adopts maximum power tracking control to capture maximum wind power; the super capacitor side DC/DC converter (SSC) takes a fixed DC bus voltage as a control target, so that the stability of the DC bus voltage is ensured; grid-side converters (GSCs) are controlled with power commands from wind power predictions, grid commands, or additional frequency modulation commands.
In FIG. 4, w r For generator speed, i r For measuring the output current of the generator, P r For measuring the output power of the generator, U dc Is straightCurrent bus voltage signal, i ess Outputting a current signal for the super capacitor, wherein f is a grid-connected point frequency signal, i g To output current measurement signal for network side, P g For network side output power measurement signal, f N For the frequency reference value, P MPPT For the power reference value of the maximum power tracking control,
active reference command for machine side converter control,/->
Is the reference value of the voltage of the direct current bus, P command For control command of network side power, +.>
And an active reference instruction for controlling the grid-side converter.
With reference to fig. 4, the control of the wind-storage integrated system can be divided into three parts:
first, the machine side converter control adopts MPPT control. By collecting the rotation speed w of the generator r Giving a power reference value P for MPPT control MPPT During the participation of frequency modulation, collecting a grid-connected point frequency signal f and a frequency reference value f N Difference is made, a frequency modulation instruction is given after droop control, and a power reference value P MPPT Active reference command for controlling machine side converter together with frequency modulation command
The method comprises the steps of carrying out a first treatment on the surface of the Active reference instruction->
And a generator output power measurement P r Generator output current measurement i r The PWM signal is used as the input of the control of the side converter, and the final controller outputs the PWM signal to control the side converter.
Secondly, after energy storage is connected in parallel with a direct current bus through DCDC, constant direct current bus voltage control is adopted; collecting input DC bus voltage signal U dc And the super capacitor outputs a current signal i ess And as energy storage side DC/DC converterAnd the controller outputs PWM signals to control the energy storage side converter.
Finally, the control of the network side converter and the control instruction P of the network side power are carried out command Given by a station or a schedule, during the participation of frequency modulation, the frequency deviation signal gives a frequency modulation instruction after droop control, and a control instruction P of network side power is given command Active reference instruction and frequency modulation instruction together forming network side converter control
The method comprises the steps of carrying out a first treatment on the surface of the Active reference instruction->
And network side output power measurement signal P g Network side output current measurement signal i g As an input for controlling the grid-side converter, the final controller outputs a PWM signal to control the grid-side converter.
When the system primary frequency modulation is participated, the wind-storage integrated system can support the whole primary frequency modulation process by releasing the kinetic energy of the rotor and the stored energy. The control structure of the wind-energy-storage integrated system is based on the control structure of the wind-energy-storage integrated system, and the strategy of simultaneously adding a frequency modulation power instruction, namely double droop control, to the outer ring of the grid-side converter is provided.
The specific process is as follows:
the fan network side converter and the machine side converter are respectively added with a sagging control command, and the network side sagging coefficient K d2 And setting according to the energy demand and the maximum expected frequency minimum point, wherein the maximum expected frequency minimum point is a self-set minimum limit capable of participating in frequency modulation, and if the frequency is lower than the minimum limit capable of participating in frequency modulation, the power capable of participating in frequency modulation reaches the limit value and does not increase with the increase of the frequency.
As a specific embodiment, the present example has a net-side sagging coefficient K d2 Can be given according to national standard recommendations, and is generally in the range of 10-50.
Coefficient of machine side sag K d1 Is determined by the actual energy to be released, the energy requirement of the fan during primary frequency modulation and the sag coefficient set by the grid-side converter. K (K) d2 Greater than K d1 And obtaining the power difference between the machine side and the net side, namely the energy which is needed to be complemented by the energy storage through sagging control calculation.
The additional frequency modulated power commands for the network side and machine side converters are expressed mathematically as:
where Δf refers to the difference between the real-time frequency and the nominal frequency. Sag factor K of grid-side converter d2 The sag factor K of the machine side converter, given by the system d1 The calculation formula is determined by the ratio of the kinetic energy of the releasable rotor of the fan rotor to the energy requirement:
fig. 5 shows a comparison diagram of the release of the wind turbine and the energy storage under the dual droop control strategy, and as can be seen from fig. 5, during primary frequency modulation, the wind turbine integrated system simultaneously releases the kinetic energy of the rotor and the energy of the energy storage, so that the wind turbine integrated system can participate in the primary frequency modulation whole process, and the problem of secondary falling caused by insufficient kinetic energy of the wind turbine exiting from the frequency modulation is avoided.
According to the control method for the wind power storage integrated system participation system frequency modulation based on double-sagging control, under the physical structure of additional energy storage on the direct-current side of the wind power generation unit, the wind power storage integrated system is ensured to continuously participate in the whole primary frequency modulation process of the system through the power control instruction of the coordinated control machine side converter and the grid side converter, the participation frequency adjustment capability of the wind power generation unit under the high wind power permeability and multi-wind power operation scene is improved, and the control method has important significance for guaranteeing safe and stable operation of the unit and the power grid.
In order to verify the effect of the method of the embodiment, the simulation model of the embodiment is a wind power plant composed of 300 2MW direct-drive wind turbines and is connected in parallel with a 39-node model. And (3) respectively verifying that the fans do not participate in frequency modulation, additional energy storage frequency modulation is carried out on the alternating current side of the fans (the net side of the fans adopts the traditional fixed direct current bus voltage control), and the additional energy storage frequency modulation is carried out on the direct current side of the extracted wind storage integrated system under the scenes of three different wind speeds, different disturbance and different permeability. A certain synchronous machine is cut out at the disturbance time of 2s, and the fan simulation adopts the disturbance time to lock P for fully releasing the kinetic energy of the rotor MPPT The value mode participates in primary frequency modulation. The following conclusions can be drawn by simulation:
the fan can effectively improve the lowest frequency point compared with the fan which does not participate in frequency modulation.
The damage of secondary frequency modulation caused by the fact that the fan participates in frequency modulation but cannot support the whole process is huge, and the larger the amplitude of secondary drop of the wind power permeability is along with the increase of the wind power permeability.
Through the sagging coefficient of reasonable distributor side and net side, can effectively release rotor kinetic energy and the energy of energy storage, reach the purpose that supports primary frequency modulation overall process. And as the wind speed scene increases, the kinetic energy of the actually releasable rotor of the fan increases, and the allocated droop coefficient is continuously increased.
The mode of additional energy storage at the alternating current side can not directly improve the releasable energy of the fan, and when the fixed sagging coefficient participates in the system frequency modulation, the fan can still exit the frequency modulation because the whole primary frequency modulation process can not be supported, so that a secondary falling event is caused.
Example two
In one or more embodiments, a control system for a wind-storage integrated system to participate in frequency modulation of a power grid system is disclosed, comprising:
the data calculation module is used for calculating the actual releasable energy of the fans participating in the system frequency modulation under different wind speed scenes and the energy requirement of the fans during primary frequency modulation;
and the frequency modulation control module is used for respectively attaching droop control instructions to the grid-side converter and the machine-side converter of the fan, wherein the droop coefficient of the machine-side converter is controlled to be determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter.
It should be noted that, the specific implementation manner of each module has been described in detail in the first embodiment, and will not be described in detail herein.
Example III
In one or more embodiments, a terminal device is disclosed, including a server, where the server includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor implements a control method for participation of a wind storage integrated system in a grid system in the first embodiment when the program is executed. For brevity, the description is omitted here.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic device, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include read only memory and random access memory and provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store information of the device type.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software.
Example IV
In one or more embodiments, a computer-readable storage medium is disclosed, in which a plurality of instructions are stored, the instructions being adapted to be loaded by a processor of a terminal device and to perform a method of controlling a wind energy storage integrated system as described in embodiment one to participate in a frequency modulation of a power grid system.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (7)
1. A control method for enabling a wind-storage integrated system to participate in frequency modulation of a power grid system is characterized by comprising the following steps:
calculating actual releasable energy of fans participating in system frequency modulation under different wind speed scenes and energy requirements of the fans during primary frequency modulation;
the actual releasable energy of the fans participating in the system frequency modulation under different wind speed scenes is the difference value between the rotor releasable energy and the energy lost by the fans due to deviation from the MPPT operation point;
the energy requirement of the fan during primary frequency modulation is specifically as follows:
wherein ,
for the AGC start response time, r is the response growth rate of AGC, +.>
For active disturbance, ++>
、/>
、
The system is characterized in that the system is respectively a sagging coefficient of an air storage integrated system, a sum of sagging coefficients of all fans participating in primary frequency modulation of the system and a sum of sagging coefficients of all synchronous machines participating in primary frequency modulation of the system;
respectively adding a sagging control command to the fan grid-side converter and the machine-side converter, wherein the sagging coefficient of the machine-side converter is determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the sagging coefficient set by the grid-side converter; the method comprises the following steps:
wherein ,
the actual releasable energy for the fan to participate in the system frequency modulation, +.>
For the energy requirement of the fan during primary frequency modulation, < >>
For controlling the sag factor of the grid-side converter.
2. The method for controlling the wind-storage integrated system to participate in the frequency modulation of the power grid system according to claim 1, wherein the energy lost by the fan due to the deviation from the MPPT operating point is calculated according to the actual rotation speed of the fan, the rated rotation speed of the fan and the frequency modulation time.
3. The method for controlling the wind-storage integrated system to participate in the frequency modulation of the power grid system according to claim 1, wherein the droop coefficient of the control grid-side converter is set according to the energy demand and the lowest point of the maximum expected frequency.
4. The control method for the wind-storage integrated system to participate in the frequency modulation of the power grid system according to claim 1, wherein the power difference between the machine side converter and the grid side converter is obtained through droop control calculation, namely the energy required to be complemented by the energy storage system.
5. The utility model provides a wind stores up control system that integration system participated in electric wire netting system frequency modulation which characterized in that includes:
the data calculation module is used for calculating the actual releasable energy of the fans participating in the system frequency modulation under different wind speed scenes and the energy requirement of the fans during primary frequency modulation;
the actual releasable energy of the fans participating in the system frequency modulation under different wind speed scenes is the difference value between the rotor releasable energy and the energy lost by the fans due to deviation from the MPPT operation point;
the energy requirement of the fan during primary frequency modulation is specifically as follows:
wherein ,
for the AGC start response time, r is the response growth rate of AGC, +.>
For active disturbance, ++>
、/>
、
The system is characterized in that the system is respectively a sagging coefficient of an air storage integrated system, a sum of sagging coefficients of all fans participating in primary frequency modulation of the system and a sum of sagging coefficients of all synchronous machines participating in primary frequency modulation of the system;
the frequency modulation control module is used for respectively attaching droop control instructions to the grid-side converter and the machine-side converter of the fan, wherein the droop coefficient of the machine-side converter is determined by the actual releasable energy, the energy requirement of the fan during primary frequency modulation and the droop coefficient set by the grid-side converter, and specifically comprises the following steps:
wherein ,
the actual releasable energy for the fan to participate in the system frequency modulation, +.>
For the energy requirement of the fan during primary frequency modulation, < >>
For controlling the sag factor of the grid-side converter.
6. A terminal device comprising a processor and a memory, the processor for implementing instructions; the memory is used for storing a plurality of instructions, which are suitable for being loaded by a processor and executing a control method for enabling the wind power storage integrated system to participate in the frequency modulation of the power grid system according to any one of claims 1 to 4.
7. A computer readable storage medium, in which a plurality of instructions are stored, characterized in that the instructions are adapted to be loaded by a processor of a terminal device and to execute a control method of a wind energy storage integrated system according to any of claims 1-4 for participating in a frequency modulation of a power grid system.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380438A (en) * | 2019-07-04 | 2019-10-25 | 湖南大学 | A kind of fast frequency hopping control method considering energy storage operation limit |
| CN112350381A (en) * | 2020-10-26 | 2021-02-09 | 国网四川省电力公司电力科学研究院 | Time-sharing coordination control method and system during MPPT operation of PMSG fan |
| CN115603334A (en) * | 2022-10-18 | 2023-01-13 | 山东大学（Cn） | Two-segment droop control method and system for non-virtual inertia wind turbine generator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380438A (en) * | 2019-07-04 | 2019-10-25 | 湖南大学 | A kind of fast frequency hopping control method considering energy storage operation limit |
| CN112350381A (en) * | 2020-10-26 | 2021-02-09 | 国网四川省电力公司电力科学研究院 | Time-sharing coordination control method and system during MPPT operation of PMSG fan |
| CN115603334A (en) * | 2022-10-18 | 2023-01-13 | 山东大学（Cn） | Two-segment droop control method and system for non-virtual inertia wind turbine generator |
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