AU2021349653A1 - Frequency modulation control method and device for wind farm - Google Patents
Frequency modulation control method and device for wind farm Download PDFInfo
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- AU2021349653A1 AU2021349653A1 AU2021349653A AU2021349653A AU2021349653A1 AU 2021349653 A1 AU2021349653 A1 AU 2021349653A1 AU 2021349653 A AU2021349653 A AU 2021349653A AU 2021349653 A AU2021349653 A AU 2021349653A AU 2021349653 A1 AU2021349653 A1 AU 2021349653A1
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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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- Control Of Eletrric Generators (AREA)
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Abstract
Provided are a frequency modulation control method and device for a wind farm. The frequency modulation control method comprises: on the basis of the frequency modulation requirements of a wind farm, enabling, for the wind farm, a function of performing frequency modulation processing in a predetermined frequency modulation control manner; on the basis of the current frequency of a power grid, determining a frequency modulation instruction under the predetermined frequency modulation control manner; determining a coordinative control mode between an automatic power generation control system and the predetermined frequency modulation control manner; and on the basis of the determined coordinative control mode, determining a power deviation instruction value according to the frequency modulation instruction, so as to perform frequency modulation processing on the basis of the determined power deviation instruction value.
Description
[0001] The present disclosure generally relates to the technical field of wind power, and in particular to a method and device for frequency modulation control of a wind farm.
[0002] With the increasing penetration rate of new energy generators, the safety and stability of wind turbines have attracted widespread attention in high-penetration regional power grids. In the actual operation of the power grid, in a case that the power consumption does not match the power supply, a small component with a small change and a short change period may be incurred in the power grid frequency. Mainly, with regard to such frequency disturbance, an adjustment system of a turbine generator directly and automatically adjusts valves of the turbine to complete power grid load compensation, so as to correct the fluctuation of the grid frequency. This process is referred to as a primary frequency modulation of the generator.
[0003] After a sudden change in power grid frequency, when the wind turbine is operating normally and the active output is greater than 20% of the rated power Pn, the wind turbine responds quickly to the frequency variation rate of the system in response to the frequency variation rate of the grid-connected point exceeding a threshold (for example, 0.3 Hz/s). This process is referred to as the inertia response.
[0004] In the conventional technology, wind turbines participate in system frequency control mainly in two aspects: inertia response and primary frequency modulation. However, in the above frequency control, primary frequency modulation and inertia response need to be started at the same time, and the corresponding power deviations of primary frequency modulation and inertia response are superimposed to obtain frequency modulation commands, which cannot achieve precise control of the power grid. In addition, in the current frequency control, the coordinating control between the primary frequency modulation and the secondary frequency modulation is relatively simple, for example, independent control of the primary frequency modulation and the secondary frequency modulation cannot be realized.
[0005] The purpose of the exemplary embodiments of the present disclosure is to provide a method and device for frequency modulation control of a wind farm, so as to overcome at least one of the above-mentioned disadvantages.
[0006] In a general aspect, a method for frequency modulation control of a wind farm is provided, the method includes: enabling, based on a frequency modulation requirement of the wind farm, a function of performing frequency modulation processing in a predetermined frequency modulation control manner for the wind farm; determining, based on a current frequency of a power gird, a frequency modulation command in the predetermined frequency modulation control manner; determining a coordination control mode of an automatic generation control system AGC and the predetermined frequency modulation control manner; and determining a power deviation command value according to the frequency modulation command based on the determined coordination control manner, so as to perform frequency modulation processing based on the determined power deviation command value.
[0007] In another general aspect, a device for frequency modulation control of a wind farm is provided, the device includes: an enabling module, configured to enable a function of performing frequency modulation processing in a predetermined frequency modulation control manner for the wind farm based on a frequency modulation requirement of the wind farm; a frequency modulation command determination module, configured to determine a frequency modulation command in the predetermined frequency modulation control manner based on a current frequency of a power gird; a coordination control module, configured to determine a coordination control mode for an automatic generation control system AGC and the predetermined frequency modulation control manner; and a power deviation determination module, configured to determine a power deviation command value according to the frequency modulation command based on the determined coordination control mode, so as to perform frequency modulation processing based on the determined power deviation command value.
[0008] In another general aspect, a controller is provided, including: a processor; and a memory having a computer program stored thereon, where the computer program, when executed by the processor, implements the above method for frequency modulation control of a wind farm.
[0009] In another general aspect, a computer-readable storage medium storing a computer program is provided, where the computer program, when executed by a processor, implements the above method for frequency modulation control of a wind farm.
[0010] According to the exemplary embodiments of the present disclosure, the method and device for frequency modulation control of a wind farm can implement independent control for different frequency modulation manners, thereby realizing precise control of the power grid.
[0011] The above and other purposes, features and advantages of exemplary embodiments of the present disclosure will become clearer through the following descriptions in conjunction with the accompanying drawings exemplarily demonstrating the embodiments, in which:
[0012] Figure 1 is a flow chart of a method for frequency modulation control of a wind farm according to an exemplary embodiment of the present disclosure;
[0013] Figure 2 is a schematic curve of droop control in primary frequency modulation according to an exemplary embodiment of the present disclosure;
[0014] Figure 3 is a schematic diagram of a step response index of primary frequency modulation according to an exemplary embodiment of the present disclosure;
[0015] Figure 4 is a flow chart of the steps of determining a power deviation command value in a block superposition mode according to an exemplary embodiment of the present disclosure;
[0016] Figure 5 is a flow chart of the steps of determining a power deviation command value in an AGC blocking frequency modulation mode according to an exemplary embodiment of the present disclosure;
[0017] Figure 6 is a flow chart of the steps of determining a power deviation command value in a frequency modulation blocking AGC mode according to an exemplary embodiment of the present disclosure;
[0018] Figure 7 is a flow chart of the steps of determining a power deviation command value in a frequency modulation superposing AGC mode according to an exemplary embodiment of the present disclosure;
[0019] Figure 8 is a block diagram of a device for frequency modulation control of a wind farm according to an exemplary embodiment of the present disclosure; and
[0020] Figure 9 is a block diagram of a controller according to an exemplary embodiment of the present disclosure.
[0021] Various exemplary embodiments will be described in detail hereinafter with reference to the drawings, in which some exemplary embodiments are shown.
[0022] Figure 1 is a flow chart of a method for frequency modulation control of a wind farm according to an exemplary embodiment of the present disclosure.
[0023] Referring to Figure 1, in step S10, based on frequency modulation requirement(s) of the wind farm, the function of performing frequency modulation in a predetermined frequency modulation control manner is enabled for the wind farm.
[0024] For example, the predetermined frequency modulation control manner may refer to the frequency modulation control manner indicated in the frequency modulation requirement of the wind farm. As an example, the predetermined frequency modulation control manner may include at least one of the following items: a primary frequency modulation manner and an inertia response frequency modulation manner.
[0025] Here, primary frequency modulation (frequency modulation for frequency variation) refers to the automatic control process in which the control system of each wind turbine in the power grid automatically controls the increase or decrease of the active power of the wind turbine once the frequency of the power grid deviates from the rated value, that is, the frequency deviation is reduced by adjusting the active output, to maintain the frequency of the power grid stable. In other words, the primary frequency modulation function is one of the means to dynamically ensure the balance of the active power of the power grid. When the frequency of the power grid increases (higher than the rated value), the primary frequency modulation function controls the wind turbines to reduce the grid-connected active power. When the frequency of the power grid is reduced (lower than the rated value), the wind turbines are controlled to increase the grid-connected active power.
[0026] The inertia response frequency modulation manner (frequency modulation for frequency variation rate) may refer to the characteristics of the active output of a wind turbine changing with time after the frequency of the power grid changes suddenly. In the case that the wind turbine is running normally and the active output is greater than 20% of the rated power Pn, and the frequency variation rate of the grid-connected point exceeds the threshold (for example, 0.3Hz/s), the wind turbine responds quickly to the frequency variation rate of the system.
[0027] For example, by controlling to change the rotor speed of the wind turbine and using the rotor kinetic energy to obtain the additional generator power of the wind turbine, an inertia response control loop associated with the system frequency is added to the variable speed control element of the wind turbine to correct the original speed control process, so that the wind turbine can adjust its active power output within a short reaction time, that is, the wind turbine has an effective response to the system frequency.
[0028] In the case that the frequency of the power grid remains at the rated value and does not change, the inertia response control loop will not effect. Once the frequency of the power grid changes, the inertia response control loop will start to act according to the control requirements. In a case that the frequency of the power grid drops, the wind turbine reduces the rotor speed through the inertia response control loop, thereby converting part of the rotor kinetic energy into active power to be input into the system. Conversely, in a case that the frequency of the power grid increases, the wind turbine absorbs part of the electromagnetic power by increasing the rotor speed, and stores the converted active power in the rotor of the wind turbine, thereby reducing the output of active power, that is, realizing the purpose that the wind turbine participates in the inertia response control of system frequency modulation.
[0029] At present, wind turbines usually have control capabilities for both inertia response frequency modulation and primary frequency modulation. The frequency modulation processing is to enable the primary frequency modulation manner and inertia response frequency modulation manner at the same time and superpose the respective power deviations corresponding to primary frequency modulation and inertia response frequency modulation to obtain frequency modulation commands. In contrast, in an exemplary embodiment of the present disclosure, not only can it enable the primary frequency modulation manner and the inertial response frequency modulation manner at the same time, but also can just enable the primary frequency modulation manner, or can just enable the inertial response frequency modulation manner, that is, the primary frequency modulation manner and the inertial response frequency modulation manner can be controlled independently, so as to realize the precise control of the power grid.
[0030] In an example, in addition to indicating the frequency modulation control manner by the frequency modulation requirement of the wind farm, the power adjustment direction is also indicated, i.e., whether to increase the power or to reduce the power.
[0031] In this case, after enabling the function of performing frequency modulation processing in the predetermined frequency modulation control manner for the wind farm, the function of power change consistent with the power adjustment direction indicated by the frequency modulation requirement of the wind farm is also enabled in the predetermined frequency modulation control manner. As an example, the function of power change may include a power increase function and a power decrease function.
[0032] In an example, the frequency modulation control method for a wind farm according to an exemplary embodiment of the present disclosure may further include: receiving adjustments to control parameters of the primary frequency modulation manner and/or the inertia response frequency modulation manner in the frequency modulation process.
[0033] In order to achieve precise control, independent input and independent parameter configuration are implemented for the primary frequency modulation manner and the inertia response frequency modulation manner, and the control parameters may be directly controlled by the dispatching system of the wind farm. The control parameters of primary frequency modulation manner and inertia response frequency modulation manner may be as shown in Table 1 below.
Table 1
Function/parameter Default Manner of modification
Control enabling
Function activating Activating Dispatching real-time control Frequency variation activating Activating Dispatching real-time control
Frequency variation rate activating Exit Dispatching real-time control Setting of control parameters of primary frequency (frequency variation) Over frequency activating 1 On-line adjustable Over frequency dead zone 0.1 On-line adjustable Over frequency cutoff frequency 50.2 On-line adjustable Over frequency slope 1 On-line adjustable
Low frequency activating 1 On-line adjustable Low frequency dead zone 0.1 On-line adjustable Low frequency cutoff frequency 49.8 On-line adjustable Low frequency slope 1 On-line adjustable Setting of control parameters of inertia response frequency (frequency variation rate)
Frequency variation rate 70.04 On-line adjustable
[0034] By adjusting the above control parameters in real time, a unified, automatic, and precise control can be realized, which remedy the inflexibility in the conventional technology, and achieve the flexible and controllable power grid with a user-friendly characteristic.
[0035] In step S20, based on a current frequencyofapowergird,afrequency modulation command in the predetermined frequency modulation control manner is determined.
[0036] Here, the frequency modulation command includes a power deviation value in the predetermined frequency modulation control manner. For example, for the case where only primary frequency modulation manner is enabled (i.e., the predetermined frequency modulation control manner is the primary frequency modulation manner), the frequency modulation command may refer to a power deviation value determined in the primary frequency modulation manner.
[0037] For the case where only the inertia response frequency modulation manner is enabled (i.e., the predetermined frequency modulation control manner is the inertia response frequency modulation manner), the frequency modulation command may refer to the power deviation value determined in the inertia response frequency modulation manner.
[0038] For the case where the primary frequency modulation manner and the inertia response frequency modulation manner are enabled at the same time (i.e., the predetermined frequency modulation control manner includes both the primary frequency modulation manner and the inertia response frequency modulation manner), the frequency modulation command may refer to a superposition of the power deviation value determined in the primary frequency modulation manner and the power deviation values determined in the inertia response frequency modulation manner.
[0039] The process of determining the power deviation value in the primary frequency modulation manner will be described with reference to Figure 2 below.
[0040] Figure 2 is a schematic curve of droop control in primary frequency modulation according to an exemplary embodiment of the present disclosure.
[0041] As shown in Figure 2, for new energy stations (such as wind farms, photovoltaic power plants), in a case that the frequency of the power grid is higher than the rated value (i.e., high frequency disturbance), downward adjustment is no longer performed in a case that the action amount corresponding to the primary frequency modulation manner reaches 10% of the rated output. In a case that the frequency of the power grid is lower than the rated value (i.e., low frequency disturbance), upward adjustment is no longer performed in a case that the action amount corresponding to the primary frequency modulation manner reaches 5% of the rated output.
[0042] For example, the droop characteristic of the primary frequency modulation may be realized by setting a polyline function of the frequency and the active power, that is, the frequency modulation for frequency variation refers to the case that outside the dead zone of the primary frequency modulation, a magnitude of the frequency deviation and the active power variation in the primary frequency modulation of the new energy station conform to the droop characteristic, which may be represented, as an example, by the following equation: 1
[0043] P=P- xPN N(f-f)/f Equation(1) 6%o
[0044] In the Equation (1), P represents the current value of active power, P represents the initial value of active power, PN represents the rated power value, f represents the current grid connected point frequency value, f, represents the dead zone of primary frequency modulation, fN represents the rated value of frequency, and 8% represents the adjustment coefficient of the primary frequency modulation of the new energy station. Here, the difference between P and P is the power deviation value in the primary frequency modulation manner.
[0045] As an example, the adjustment coefficient 6% is the ratio of the system frequency variation per unit value (with the rated frequency as the reference value) to the active power variation per unit value (with the rated power as the reference value).
[0046] For example, in the droop characteristic curve shown in Figure 2, the dead zone f, of primary frequency modulation is set to 0.05Hz, the adjustment coefficient 6% is set to 5%, and the maximum power limit for adjusting the power up in the primary frequency modulation is set to 6% PN , and the maximum power limit for adjusting the power down in the primary frequency modulation is set to 10% PN .
[0047] Figure 3 is a schematic diagram of a step response index of primary frequency modulation according to an exemplary embodiment of the present disclosure.
[0048] As shown in Figure 3, the step response index of primary frequency modulation is as follows: to represents the initial time, trepresents the enabling time, tP represents the response time, t, represents the adjustment time, PNrepresents the rated power value, and AP represents the target power adjustment amount.
[0049] It should be understood that the approach for determining the power deviation value in the primary frequency modulation manner described above is merely an example. Those skilled in the art may determine the power deviation value in the primary frequency modulation manner in other ways. In addition, the parameter values listed in Figures 2 and 3 are only examples, and the disclosure is not limited thereto. Those skilled in the art may adjust the parameter values as needed.
[0050] The process of determining the power deviation value in the inertia response frequency modulation manner will be described below.
[0051] In the inertia response frequency modulation manner, the active power variation AP (i.e., the power deviation value) of the virtual synchronous generator should satisfy the equation below:
[0052] AP P dfp Equation (2) fv dt
[0053] In the Equation (2), f represents the current frequency value of the grid-connected point, fN represents the rated value of the frequency, PNrepresents the rated power value, and T represents the inertial time constant.
[0054] For example, the inertia time constant T may be calculated using the equation below:
[0055] N Equation (3)
[0056] In the Equation (3), J represents the moment of inertia of the virtual synchronous generator, PNrepresents the rated active power value of the virtual synchronous generator, and aoNrepresents the rated angular velocity of the system.
[0057] It should be understood that the approach for determining the power deviation value in the inertia response frequency modulation manner described above is only an example. Those skilled in the art may determine the power deviation value in the inertia response frequency modulation manner in other ways.
[0058] Referring back to Figure 1, in step S30, a coordination control mode for an automatic generation control system AGC and the predetermined frequency modulation control manner is determined.
[0059] The above-mentioned predetermined frequency modulation control manner is deviation adjustment, which can only ease the change amount of the power grid frequency. Therefore, it is necessary to use a synchronizer to accelerate or decelerate the load of some wind turbines to restore the power grid frequency. This process is called secondary frequency modulation.
[0060] In other words, the frequency of the power grid can be accurately maintained at a constant value only after secondary frequency modulation. Currently, there are two approaches for secondary frequency modulation: (a) the dispatching system issues general commands to each new energy station to adjust the load; and (b) wind turbines operate in AGC manner to achieve automatic load dispatch of the wind turbines. That is, the primary frequency modulation is that the turbine speed control system automatically adjusts the load of wind turbine according to the change of the power grid frequency to restore the power grid frequency, while the secondary frequency modulation is to manually adjust the load of wind turbine according to the power grid frequency.
[0061] The coordination control mode of the predetermined frequency modulation control manner and AGC is a real-time selection control mode for dispatching participation. In the exemplary embodiment of the present disclosure, four coordination control modes for selecting and achieving the coordination control of the predetermined frequency modulation control manner and AGC are listed. Here, in a case that the coordination control mode is not selected, the frequency modulation processing is only performed in the predetermined frequency modulation control manner. In this case, the power deviation command value is the frequency modulation command.
[0062] As an example, the coordination control mode may include, but not limited to, any of the following: block superposition mode, AGC blocking frequency modulation mode, frequency modulation blocking AGC mode, and frequency modulation superposing AGC mode.
[0063] In an exemplary embodiment of the present disclosure, there are multiple coordination control modes of the predetermined frequency modulation control manner and AGC, and each coordination control mode includes various sub-modes. The coordination control modes co-exist and complement each other to achieve flexible selections. The coordination control modes for the predetermined frequency modulation control manner and AGC are as shown in Table 2 below.
[0064] Table 2
Coordination control mode of the predetermined frequency modulation control manner and
AGC Block superposition First superposition sub- Exit On-line adjustable
mode
Second superposition sub- Exit On-line adjustable
mode
AGC blocking frequency First blocking sub-mode Activating Dispatching real-time
modulation control
Second blocking sub- Activating Dispatching real-time
mode control
Frequency modulation Third blocking sub-mode Exit Dispatching real-time
blocking AGC control
Fourth blocking sub-mode Exit Dispatching real-time control
Frequency modulation Third superposition sub- Exit Dispatching real-time
superposing AGC mode control
Fourth superposition sub- Exit Dispatching real-time
mode control
[0065] As shown in Table 2, for the block superposition mode, the activating and exit of the coordination control mode may be controlled on-line and in real time. For the AGC blocking frequency modulation mode, frequency modulation blocking AGC mode, and frequency modulation superposing AGC mode, the activating and exit of each of the coordination control modes may be controlled in real time via the dispatching system. For example, the above three coordination control modes may be provided to the dispatching system. The dispatching system selects one from the provided coordination control modes and feeds back mode selection information indicating the selected coordination control mode. At this time, based on the mode selection information received from the dispatching system, the selected coordination control mode indicated by the mode selection information may be activated, and other coordination control modes may be controlled to exit.
[0066] In step S40, a power deviation command value is determined according to the frequency modulation command based on the determined coordination control mode, so as to perform frequency modulation processing based on the determined power deviation command value.
[0067] For example, the determined power deviation command value may be issued to each wind turbine in the wind farm, so as to control each wind turbine to perform frequency modulation processing.
[0068] In an exemplary embodiment of the present disclosure, the coordination control manner of the predetermined frequency modulation control manner (such as primary frequency modulation) and secondary frequency modulation may be controlled independently, thereby realizing precise control of the power grid. The process of determining the power deviation command values in different coordination control modes will be described with reference to Figures 4 to 7.
[0069] Figure 4 is a flow chart of the steps of determining the power deviation command value in the block superposition mode according to an exemplary embodiment of the present disclosure.
[0070] Referring to Figure 4, in step S411, based on the current frequency of the power grid, the block superposition mode where the AGC is located is determined.
[0071] As an example, the block superposition mode may include a first superposition sub-mode and a second superposition sub-mode. In this case, it may be determined which superposition sub mode the AGC is in based on the current frequency of the power grid.
[0072] For example, it may be determined whether the current frequency of the power grid is within the range of the block dead zone. On determining that the current frequency of the power grid is within the range of the block dead zone (e.g., less than or equal to the upper limit value of the block dead zone range, or greater than or equal to the lower limit value of the block dead zone range), it may be determined that the block superposition mode where the AGC is located is the first superposition sub-mode. On determining that the current frequency of the power grid is not within the range of the block dead zone (e.g., greater than the upper limit value of the block dead zone range or less than the lower limit value of the block dead zone range), it may be determined that the block superposition mode where the AGC is located is the second superposition sub-mode.
[0073] In step S412, a power deviation command value is determined based on the frequency modulation command in a superposition mode corresponding to the block superposition mode where the AGC is located.
[0074] For example, the superposition manner corresponding to the first superposition sub-mode is: superposing the AGC power command and the frequency modulation command to obtain the power deviation command value. That is, in a case of falling in the range of the block dead zone, the AGC power command and the frequency modulation command are superposed as a form of algebraic sum.
[0075] Here, the AGC power command refers to a power deviation value determined in the AGC. Various ways may be used to determine the power deviation value in the AGC.
[0076] For example, a superposition mode corresponding to the second superposition sub-mode may be: in a case of falling out of the range of the block dead zone, then superposition is performed in the positive direction and blocking is performed in the negative direction. Specifically, it may be determined whether the direction of the AGC power command is consistent with the direction of the frequency modulation command. In a case that the direction of the AGC power command is consistent with the direction of the frequency modulation command (i.e., in a positive direction), then the AGC power command and the frequency modulation command are superposed to obtain the power deviation command. In a case that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command (i.e., in a negative direction), the AGC frequency modulation function will be blocked. In this case, the power deviation command value is the frequency modulation command.
[0077] Figure 5 is a flow chart of the steps of determining a power deviation command value in an AGC blocking frequency modulation mode according to an exemplary embodiment of the present disclosure.
[0078] Referring to Figure 5, in step S421, it is determined whether the AGC is power restricted.
[0079] In an example, whether the AGC is power restricted may be determined by: determining a power reference value; determining whether the power reference value meets a preset condition; in a case that the power reference value meets the preset condition, determining that the AGC is not power restricted; otherwise, in a case that the power reference value does not meet the preset condition, determining that the AGC is power restricted.
[0080] As an example, the power reference value may include but not limited to any one of the following items: a measured power deviation value, a rated power deviation value, and a power value in the AGC.
[0081] For the case where the power reference value is the measured power deviation value, the measured power deviation value may be determined based on the power value in the AGC and the measured power value.
[0082] For example, the following equation may be used to determine: DeltPea, = Pcmde - a- P" Equation (4)
[0083] In the Equation (4), DeltP,,,representsthe measured power deviation value, Pcd_,,c
represents the power value in the AGC, and Pearepresents the measured power value.
[0084] In this case, if the measured power deviation value DeltP,, is less than a first set value a, it is determined that the power reference value meets the preset condition; and if the measured power deviation value DeltP,,, is no less than (i.e., greater than or equal to) the first set value a, it is determined that the power reference value does not meet the preset condition.
[0085] In an example, the first set value a may be determined based on the rated power value 'ated , for example, a= 0.1 x P,,Ie .
[0086] For the case where the power reference value is the rated power deviation value, the rated power deviation value may be determined based on the power value in the AGC and the rated power value.
[0087] For example, the following equation may be used to determine:
[0088] Delt -d= P'er _-age- 'raed Equation (5)
[0089] In the Equation (5), DeltFaIed represents the rated power deviation value, e.ndagc represents the power value in the AGC, and ratedrepresents the rated power value.
[0090] In this case, if the rated power deviation value Deltated isless than a second set value P, it is determined that the power reference value meets the preset condition; if the rated power deviation value DeltP.wd is no less than (i.e., greater than or equal to) the second set value ,it is determined that the power reference value does not meet the preset condition.
[0091] In an example, the second set value P may be determined based on the rated power value
aIed , for example, 1 = 0.01 X 'aed . Here, the first set value a is greater than the second set valuefp.
[0092] For the case where the power reference value is the power value Pd agin the AGC, if
Pcm d_agcis equal to a third set value, then it is determined that the power reference value meets the preset condition; if 'cd_agcis not equal to the third set value, then it is determined that the power reference value does not meet preset conditions. As an example, the third set value may be equal to zero.
[0093] Here, it should be understood that the values of the first set value a, the second set value P and the third set value listed above are only examples, and the disclosure is not limited thereto. The skilled in the art may adjust the values of the above-mentioned set values as needed.
[0094] In other words, when the AGC is power restricted, the AGC blocks the frequency modulation function. After the AGC is restored from power restricted status, the frequency modulation may be automatically adjusted according to the actual needs. Since the frequency modulation is adjusted on the basis of the current power, the frequency modulation is exited immediately and the frequency modulation action signal is withdrawn once the AGC is power restricted in the action process of the frequency modulation.
[0095] In a case that the AGC is not power restricted, step S422 is performed: obtaining a power deviation command value based on the AGC power command and the frequency modulation command. For example, the power deviation command value may be obtained by superposing the AGC power command and the frequency modulation command.
[0096] In this case, the AGC does not block the frequency modulation function. When the frequency of the grid-connected point exceeds the dead zone, the frequency modulation action will be triggered and AGC and dispatch frequency modulation action signals.
[0097] For example, the AGC blocking frequency modulation mode may include but not limited to a first blocking sub-mode and a second blocking sub-mode. As an example, the first blocking sub-mode refers to the case of both positive and negative blocking of AGC frequency modulation function. The second blocking sub-mode refers to the case of negative blocking of the AGC frequency modulation function, that is, when the AGC is power restricted and the direction of the AGC power command is opposite to the direction of the frequency modulation command, the AGC frequency modulation function is blocked; and the AGC frequency modulation function is not blocked when the two directions are consistent.
[0098] In a case that the AGC is power restricted, the power deviation command value may be determined according to the frequency modulation command based on a blocking manner corresponding to the AGC blocking frequency modulation mode where the AGC is located.
[0099] For example, in step S423, it is determined whether the negative blocking of AGC frequency modulation function is enabled, that is, it is determined whether the second blocking sub-mode is enabled. Here, which blocking sub-mode is enabled may be controlled by the dispatching system.
[0100] In a case that the negative blocking of AGC frequency modulation function is not enabled, step S424 is performed: determining that the AGC is in the first blocking sub-mode.
[0101] In step S425, in the first blocking sub-mode, the AGC frequency modulation function is blocked, and the frequency modulation command is determined as the power deviation command value.
[0102] In a case that the negative blocking of AGC frequency modulation function is enabled, step S426 is performed: determining that the AGC is in the second locking sub-mode.
[0103] In step S427, it is determined whether the frequency modulation command DeltP PFC is zero.
[0104] In a case that the frequency modulation commandDeltP_PFC is zero, step S428 is performed: it is determined that the power deviation command value is zero. In this case, AGC_ AGCCommandPO assignment and AGCDeltPFlagOld assignment may also be performed.Here, AGC _ AGCCommandPOrepresents the power value at the initial point (when entering the AGC), and AGCDeltPFlagOld represents the historical AGC power deviation value, that is, the AGC power deviation value when the frequency modulation control was performed last time.
[0105] Ina case that the frequency modulation command DeltP PFC isnotzero, step S429 is performed: determining whether a determination condition is met.
[0106] As an example, the determining whether the determination condition is met may refer to determining whether AGCDeltPFlagOld is equal to zero when Pcmd- agc - AGC _ AGCCommandPO is equal to zero.
[0107] In a case that AGCDeltPFlagOld is not equal to zero when Pcmd _agc- AGC_ AGCCommandPO is equal to zero, then it is determined that the determination condition is met; in a case that AGCDeltPFlagOld is equal to zero when Pcmd _agc- AGC_ AGCCommandPO is equal to zero, it is determined that the determination condition is not met.
[0108] In a case that the determination condition is met, step S430 is performed: determining the historical AGC power deviation value as the current AGC power deviation value, i.e., AGCDeltPFag= AGCDeltPFlagOld.In this case, the frequency modulation command and AGCDeltPFlag are superposed to obtain the power deviation command value.
[0109] In a case that the determination condition is not met, step S431 is performed: determining whether the direction of the AGC power command is consistent with the direction of the frequency modulation command.
[0110] For example, the direction of Pcmd _agc- AGC_ AGCCommandPO and the directionof DeltPPFC maybe determined.
[0111] In a case that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command, step S432 is performed: blocking the AGC frequency modulation function, and determining the frequency modulation command as the power deviation command value.
[0112] In a case that the direction of the AGC power command is consistent with the direction of the frequency modulation command, step S433 is performed: superposing the power command and the frequency modulation command to obtain a power deviation command value.
[0113] Figure 6 is a flow chart of the steps of determining a power deviation command value in a frequency modulation blocking AGC mode according to an exemplary embodiment of the present disclosure.
[0114] As an example, the frequency modulation blocking AGC may include but not limited to a third blocking sub-mode and a fourth blocking sub-mode. For example, the third blocking sub- mode may refer to positive and negative blocking, and the fourth blocking sub-mode may refer to negative blocking.
[0115] In this case, the power deviation command value may be determined according to the frequency modulation command based on a blocking manner corresponding to the frequency modulation blocking AGC mode where the AGC is located.
[0116] Specifically, referring to Figure 6, in step S441, it is determined whether the negative blocking is enabled.
[0117] In a case that the negative blocking is not enabled, it indicates that the AGC is in the third blocking sub-mode, that is, positive and negative blocking. In step S442, it is determined whether the frequency modulation command is zero.
[0118] In a case that the frequency modulation command is zero, then step S443 is performed: determining that the power deviation command value is zero, i.e., BlockLogicDeltP= 0.
[0119] In a case that the frequency modulation command is not zero, then step S444 is performed: determining whether the AGC is in a process of exiting frequency modulation. Here, various ways may be used to determine whether the AGC is in the process of exiting frequency modulation.
[0120] In a case that the AGC is not in the process of exiting frequency modulation, step S445 is performed: determining the frequency modulation command as the power deviation command value.
[0121] In a case that the AGC is in the process of exiting frequency modulation, step S446 is performed: determining the difference between the current AGC power command and the power command before entering frequency modulation, and determining the sum of the frequency modulation command and the difference as the power deviation command value.
[0122] For example, the following equation maybe used to determine the AGC power command:
[0123] DelItPAGC=Pcmd-agc- PFCAGCCommandPO Equation (6)
[0124] In the Equation (6), DeltP_ AGC represents the power deviation value in the AGC, Pcmd _ agc represents the power value in the AGC, and PFC_ AGCCommandPO represents the power value at the initial point.
[0125] In a case that the negative blocking is enabled, it indicates that the AGC is in the fourth blocking sub-mode. Then in step S447, it is determined whether the frequency modulation command is zero.
[0126] In a case that the frequency modulation command is zero, then step S448 is performed: determining that the power deviation command value BlockLogicDeltP is zero, and AGCDeltPFlagOld= 0.
[0127] In a case that the frequency modulation command is not zero, then step S449 is performed: determining whether AGCDeItPFagOldis zero when the AGC power command DeltPAGC is zero.
[0128] In a case that AGCDeltPFlagOldis not zero when the AGC power command is zero, step S450 is performed: determining the historical AGC power deviation value as the current AGC power deviation value, and superposing the frequency modulation command and AGCDeItPFlagto obtain the power deviation command value.
[0129] Inacasethat AGCDeltPFlagOldis zero when the AGC power command is zero, step S451 is performed: determining whether the direction of the AGC power command DeltP_ AGC is consistent with the direction of the frequency modulation command DeltPFPC.
[0130] In a case that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command, then step S452 is performed: determining the frequency modulation command as the power deviation command value BlockLogicDeltP.
[0131] In a case that the direction of the AGC power command is consistent with the direction of the frequency modulation command, step S453 is performed: superposing the AGC power command and the frequency modulation command to obtain the power deviation command value.
[0132] Figure 7 is a flow chart of the steps of determining a power deviation command value in a frequency modulation superposing AGC mode according to an exemplary embodiment of the present disclosure.
[0133] As an example, the frequency modulation superposing AGC mode may include but not limited to a third superposition sub-mode and a fourth superposition sub-mode, for example, the third superposition sub-mode may refer to positive and negative superposition, and the fourth superposition sub-mode may refer to positive superposition.
[0134] In this case, the power deviation command value may be determined according to the frequency modulation command based on the superposition manner corresponding to the frequency modulation superposing AGC mode in which the AGC is.
[0135] Referring to Figure 7, in step S461, it is determined whether positive superposition is enabled.
[0136] In a case that the positive superposition is not enabled, it indicates that the AGC is in the third superposition sub-mode, that is, both the positive AGC and the negative AGC are superposed with the frequency modulation command. Then in step S462, it is determined whether the frequency modulation command is zero.
[0137] In a case that the frequency modulation command is zero, then step S463 is performed: determining the power deviation command value to be zero, that is, BlockLogicDeltP= 0.
[0138] In a case that the frequency modulation command is not zero, then step S464 is performed: superposing the AGC power command with the frequency modulation command and PA _ Delt_ AGCOld to obtain the power deviation command value.
[0139] For example, the following equation may be used to determine the power deviation command value:
[0140] BlockLogicDeltP=DeltPFPC+DeltPAGC+PADeltAGCOld
Equation (7)
[0141] In the Equation (7), BlockLogicDeltP represents the power deviation command value, DeltP_ FPC represents the power deviation value in the predetermined frequency modulation control manner, DeltP_ AGC represents the power deviation value in the AGC, and PA _ Delt _ AGCOld represents the historical AGC power deviation value.
[0142] In a case that the positive superposition is enabled, it indicates that the AGC is in the fourth superposition sub-mode. Then in step S465, it is determined whether the frequency modulation command is zero.
[0143] In a case that the frequency modulation command is zero, then step S466 is performed: determining the power deviation command value to be zero, that is, BlockLogicDeltP= 0.
[0144] In a case that the frequency modulation command is not zero, then step S467 is performed: determining whether the historical AGC power deviation value is zero when the AGC power command is zero.
[0145] In a case that the historical AGC power deviation value is not zero when the AGC power command is zero, then step S468 is performed: determining the historical AGC power deviation value as the current AGC power deviation value, and superposing the frequency modulation command and AGCDeltPFlagto obtain the power deviation command value.
[0146] In a case that the historical AGC power deviation value is zero when the AGC power command is zero, step S469 is performed: determining whether the direction of the AGC power command DeltP_ AGC is consistent with the direction of the frequency modulation command DeltP_FPC.
[0147] In a case that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command, step S470 is performed: superposing the frequency modulation command and the historical AGC power deviation value PA _ Delt_ AGCOld to obtain the power deviation command value.
[0148] For example, the following equation may be used to determine the power deviation command value:
[0149] BlockLogicDeltP=DeltPFPC+PA _Delt_ AGCOld Equation (8)
[0150] In the Equation (8), BlockLogicDeltP represents the power deviation command value, DelIPFPC represents the power deviation value in the predetermined frequency modulation control manner, and PA _ Delt_ AGCOld represents the historical AGC power deviation value.
[0151] In a case that the direction of the AGC power command is consistent with the direction of the frequency modulation command, step S471 is performed: superposing the AGC power command, the frequency modulation command and the historical AGC power deviation value PA _ Delt _ AGCOld to obtain the power deviation command value, as shown in the above Equation (7).
[0152] Figure 8 is a block diagram of a device for frequency modulation control of a wind farm according to an exemplary embodiment of the present disclosure.
[0153] As shown in Figure 8, a device 100 for frequency modulation control of a wind farm according to an exemplary embodiment of the present disclosure includes: an enabling module 101, a frequency modulation command determination module 102, a coordination control module 103 and a power deviation determination module 104. In an example, the device 100 for frequency modulation control may be set in a controller of the wind farm.
[0154] Specifically, the enabling module 101 is configured to enable a function of performing frequency modulation processing in a predetermined frequency modulation control manner for the wind farm based on a frequency modulation requirement of the wind farm.
[0155] For example, the predetermined frequency modulation control manner may refer to the frequency modulation control manner indicated by the frequency modulation requirement of the wind farm. As an example, the predetermined frequency modulation control manner may include at least one of a primary frequency modulation manner and an inertia response frequency modulation manner.
[0156] In addition, the frequency modulation requirement of the wind farm may also indicate a power adjustment direction, that is, indicate whether the power adjustment is to increase or decrease power.
[0157] In this case, after enabling the function of performing frequency modulation processing in the predetermined frequency modulation control manner for the wind farm, the enabling module 101 further enables, in the predetermined frequency modulation control manner, the function of power change consistent with the power adjustment direction indicated by the frequency modulation requirement of the wind farm. As an example, the function of power change may include a power increase function and a power decrease function.
[0158] In an optional example, during the frequency modulation process, the enabling module 101 receives the adjustment to the control parameters of the primary frequency modulation manner and/or the inertia response frequency modulation manner.
[0159] The frequency modulation command determining module 102 is configured to determine a frequency modulation command in the predetermined frequency modulation control manner based on a current frequency of a power gird.
[0160] For example, for the case where only primary frequency modulation manner is enabled (i.e., the predetermined frequency modulation control manner is the primary frequency modulation manner), the frequency modulation command may refer to a power deviation value determined in the primary frequency modulation manner.
[0161] For the case where only the inertia response frequency modulation manner is enabled (i.e., the predetermined frequency modulation control manner is the inertia response frequency modulation manner), the frequency modulation command may refer to the power deviation value determined in the inertia response frequency modulation manner.
[0162] For the case where the primary frequency modulation manner and the inertia response frequency modulation manner are enabled at the same time (i.e., the predetermined frequency modulation control manner includes both the primary frequency modulation manner and the inertia response frequency modulation manner), the frequency modulation command may refer to a superposition of the power deviation value determined in the primary frequency modulation manner and the power deviation value determined in the inertia response frequency modulation manner.
[0163] The coordination control module 103 is configured to determine a coordination control mode of an automatic generation control system AGC and the predetermined frequency modulation control manner.
[0164] As an example, the coordination control mode may include, but not limited to, any of the following items: block superposition mode, AGC blocking frequency modulation mode, frequency modulation blocking AGC mode, and frequency modulation superposing AGC mode.
[0165] The power deviation determination module 104 is configured to determine a power deviation command value according to the frequency modulation command based on the determined coordination control mode, so as to perform frequency modulation processing based on the power deviation command value as determined.
[0166] For the case where the coordination control mode is the block superposition mode, the process of determining the power deviation command value by the power deviation determination module 104 is: based on the current frequency of the power grid, determining the block superposition mode where the AGC is located, and determining the power deviation command value based on the frequency modulation command in the superposition mode corresponding to the block superposition mode where the AGC is located.
[0167] For the case where the coordination control mode is the AGC blocking frequency modulation mode, the process of determining the power deviation command value by the power deviation determination module 104 is: determining whether the AGC is power restricted; in a case that the AGC is not power restricted, then obtaining power deviation command value based on the AGC power command and the frequency modulation command; in a case that the AGC is power restricted, determining the power deviation command value according to the frequency modulation command based on a blocking manner corresponding to the AGC blocking frequency modulation mode where the AGC is located.
[0168] For the case where the coordination control mode is the frequency modulation blocking AGC mode, the process of determining the power deviation command value by the power deviation determination module 104 is: determining the power deviation command value according to the frequency modulation command based on the blocking manner corresponding to the frequency modulation blocking AGC mode where the AGC is located.
[0169] For the case where the coordination control mode is the frequency modulation superposing AGC mode, the process of determining the power deviation command value by the power deviation determination module 104 is: determining the power deviation command value according to the frequency modulation command based on the superposition manner corresponding to the frequency modulation superposing AGC mode where the AGC is located.
[0170] Since the manner of determining the power deviation command values in different coordination control modes has been described in detail in Figures 4 to 7, description will not be repeated here.
[0171] Figure 9 is a block diagram of a controller according to an exemplary embodiment of the present disclosure.
[0172] As shown in Figure 9, according to the exemplary embodiment of the present disclosure, the controller 200 includes: a processor 201 and a memory 202.
[0173] Specifically, the memory 202 is used to store a computer program, and when the computer program is executed by the processor 201, the above-mentioned method for frequency modulation control of a wind farm is implemented.
[0174] Here, the method for frequency modulation control of a wind farm shown in Figure 1 may be implemented in the processor 201 shown in Figure 9. In other words, each module shown in Figure 8 may be realized by general-purpose hardware processors such as digital signal processors, field programmable gate arrays, or may be realized by dedicated hardware processors such as dedicated chips, or may be completely realized by software via a computer program. For example, it may be implemented as various modules in the processor 201 shown in Figure 9. As an example, the controller 200 shown in Figure 9 may be a controller of a wind farm.
[0175] According to the exemplary embodiment of the present disclosure, a computer-readable storage medium storing a computer program is further provided. The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to implement the above method for frequency modulation control of a wind farm. The computer readable storage medium is any data storage device that can store data read by a computer system. Examples of computer-readable storage media include: read-only memory, random-access memory, optical disc, magnetic tape, floppy disk, optical data storage devices, and carrier waves (such as data transmission over the Internet via wired or wireless transmission paths).
[0176] According to the exemplary embodiments of the present disclosure, the method and device for frequency modulation control of a wind farm can realize the independent activating of the primary frequency modulation manner and the inertia response frequency modulation manner, thereby realizing the precise control of the power grid. In addition, it can also realize the independent control of a coordination control manner for the primary frequency modulation and the secondary frequency modulation, which can further facilitate accurate control of the power grid.
[0177] In addition, according to the exemplary embodiments of the present disclosure, the method and device for frequency modulation control of a wind farm can be adaptable to more power grid requirements and more regional environments.
[0178] Although the present disclosure has been shown and described with reference to various exemplary embodiments, it should be understood by those skilled in the art that modifications in formality and in detail to such embodiments may be made, without departing from the spirit and scope of the present disclosure defined by the claims and their equivalents.
Claims (16)
1. A method for frequency modulation control of a wind farm, comprising: enabling, based on a frequency modulation requirement of the wind farm, a function of performing frequency modulation processing in a predetermined frequency modulation control mode for the wind farm; determining, based on a current frequency of a power gird, a frequency modulation command in the predetermined frequency modulation control manner; determining a coordination control mode of an automatic generation control system AGC and the predetermined frequency modulation control manner; and determining a power deviation command value according to the frequency modulation command based on the determined coordination control mode, so as to perform frequency modulation processing based on the determined power deviation command value.
2. The method for frequency modulation control according to claim 1, wherein the predetermined frequency modulation control manner is a frequency modulation control manner indicated in the frequency modulation requirement of the wind farm; and/or the predetermined frequency modulation control manner comprises at least one of a primary frequency modulation manner and an inertia response frequency modulation manner.
3. The method for frequency modulation control according to claim 2, further comprising: receiving adjustments to control parameters of the primary frequency modulation manner and/or the inertia response frequency modulation manner in the frequency modulation processing, and/or the frequency modulation requirement of the wind farm further indicates a power adjustment direction, wherein a function of power change consistent with the power adjustment direction indicated by the frequency modulation requirement of the wind farm is enabled in the predetermined frequency modulation control manner, wherein the function of power change comprises a power increase function and a power decrease function.
4. The method for frequency modulation control according to claim 1, wherein the coordination control mode comprises a block superposition mode, and the block superposition mode comprises a first superposition sub-mode and a second superposition sub-mode, wherein the determining the power deviation command value according to the frequency modulation command based on the determined coordination control mode comprises: determining, based on the current frequency of the power grid, a block superposition mode where the AGC is located, determining the power deviation command value based on the frequency modulation command in a superposition mode corresponding to the block superposition mode where the AGC is located, wherein, the superposition mode corresponding to the first superposition sub-mode comprises: superposing an AGC power command and the frequency modulation command to obtain the power deviation command value; and the superposition mode corresponding to the second superposition sub-mode comprises: determining whether a direction of the AGC power command is consistent with a direction of the frequency modulation command; superposing the AGC power command and the frequency modulation command to obtain the power deviation command value once determining that the direction of the AGC power command is consistent with the direction of the frequency modulation command; blocking an AGC frequency modulation function and determining the frequency modulation command as the power deviation command value once determining that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command.
5. The method for frequency modulation control according to claim 4, wherein the determining, based on the current frequency of the power grid, the block superposition mode where the AGC is located, comprises: determining whether the current frequency of the power grid is within a range of a block dead zone; determining the block superposition mode where the AGC is located is the first superposition sub-mode, once determining that the current frequency of the power grid is within the range of the block dead zone; and determining the block superposition mode where the AGC is located is the second superposition sub-mode, once determining that the current frequency of the power grid is not within the range of the block dead zone.
6. The method for frequency modulation control according to claim 1, wherein the coordination control mode comprises an AGC blocking frequency modulation mode, and the AGC blocking frequency modulation mode comprises a first blocking sub-mode and a second blocking sub-mode, wherein the determining the power deviation command value according to the frequency modulation command based on the determined coordination control mode comprises: determining whether the AGC is power restricted; determining the power deviation command value according to the frequency modulation command based on a blocking mode corresponding to the AGC blocking frequency modulation mode where the AGC is located, once determining that the AGC is power restricted; and obtaining the power deviation command value based on the AGC power command and the frequency modulation command, once determining that the AGC is not power restricted, wherein, the blocking mode corresponding to the first blocking sub-mode comprises: blocking AGC frequency modulation function both in positive and negative directions; and in the first blocking sub-mode, blocking the AGC frequency modulation function and determining the frequency modulation command as the power deviation command value; and the blocking mode corresponding to the second blocking sub-mode comprises: blocking the AGC frequency modulation function in negative direction; and in the second blocking sub-mode, superposing an AGC power command and the frequency modulation command to obtain the power deviation command value once determining that a direction of the AGC power command is consistent with a direction of the frequency modulation command, and blocking the AGC frequency modulation function and determining the frequency modulation command as the power deviation command value once determining that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command.
7. The method for frequency modulation control according to claim 1, wherein the coordination control mode comprises a frequency modulation blocking AGC mode, and the frequency modulation blocking AGC mode comprises a third blocking sub-mode and a fourth blocking sub-mode, wherein the method further comprises determining the power deviation command value according to the frequency modulation command based on the blocking mode corresponding to the frequency modulation blocking AGC mode where the AGC is located.
8. The method for frequency modulation control according to claim 7, wherein in the third blocking sub-mode, the determining the power deviation command value comprises: determining whether the frequency modulation command is zero; determining the power deviation command value to be zero once determining that the frequency modulation command is zero; determining whether the AGC is in a process of exiting frequency modulation, once determining that the frequency modulation command is not zero; determining a difference between a current AGC power command and a power command before entering the frequency modulation, and determining a sum of the frequency modulation command and the difference as the power deviation command value, once determining that the AGC is in the process of exiting the frequency modulation; and determining the frequency modulation command as the power deviation command value, once determining that the AGC is not in the process of exiting frequency modulation.
9. The method for frequency modulation control according to claim 7, wherein in the fourth blocking sub-mode, the determining the power deviation command value comprises: determining whether the frequency modulation command is zero; determining the power deviation command value to be zero once determining that the frequency modulation command is zero; determine whether a historical AGC power deviation value is zero when the AGC power command is zero, once determining that the frequency modulation command is not zero; determining the historical AGC power deviation value as the current AGC power deviation value, once determining that the historical AGC power deviation value is not zero when the AGC power command is zero; determining whether a direction of the AGC power command is consistent with the direction of the frequency modulation command, once determining that the historical AGC power deviation value is zero when the AGC power command is zero; superposing the AGC power command and the frequency modulation command to obtain the power deviation command value, once determining that the direction of the AGC power command is consistent with the direction of the frequency modulation command; and determining the frequency modulation command as the power deviation command value, once determining that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command.
10. The method for frequency modulation control according to claim 1, wherein the coordination control mode comprises a frequency modulation superposing AGC mode, and the frequency modulation superposing AGC mode comprises a third superposition sub-mode and a fourth superposition sub-mode, wherein the method further comprises determining the power deviation command value according to the frequency modulation command based on a superposition mode corresponding to the frequency modulation superposing AGC mode where the AGC is located.
11. The method for frequency modulation control according to claim 10, wherein in the third superposition sub-mode, the determining the power deviation command value comprises: determining whether the frequency modulation command is zero; determining the power deviation command value to be zero, once determining that the frequency modulation command is zero; and superimposing the AGC power command, the frequency modulation command and the historical AGC power deviation value to obtain the power deviation command value, once determining that the frequency modulation command is not zero.
12. The method for frequency modulation control according to claim 10, wherein in the fourth superposition sub-mode, the determining the power deviation command value comprises: determining whether the frequency modulation command is zero; determining the power deviation command value to be zero, once determining that the frequency modulation command is zero; determine whether a historical AGC power deviation value is zero when the AGC power command is zero, once determining that the frequency modulation command is not zero; determining the historical AGC power deviation value as the current AGC power deviation value, once determining that the historical AGC power deviation value is not zero when the AGC power command is zero; determining whether the direction of the AGC power command is consistent with the direction of the frequency modulation command, once determining that the historical AGC power deviation value is zero when the AGC power command is zero; superposing the AGC power command, the frequency modulation command and the historical AGC power deviation value to obtain the power deviation command value, once determining that the direction of the AGC power command is consistent with the direction of the frequency modulation command; and superposing the frequency modulation command and the historical AGC power deviation value to obtain the power deviation command value, once determining that the direction of the AGC power command is inconsistent with the direction of the frequency modulation command.
13. A device for frequency modulation control of a wind farm, comprising: an enabling module, configured to enable a function of performing frequency modulation processing in a predetermined frequency modulation control manner for the wind farm based on a frequency modulation requirement of the wind farm; a frequency modulation command determination module, configured to determine a frequency modulation command in the predetermined frequency modulation control manner based on a current frequency of a power gird; a coordination control module, configured to determine a coordination control mode of an automatic generation control system AGC and the predetermined frequency modulation control manner; and a power deviation determination module, configured to determine a power deviation command value according to the frequency modulation command based on the determined coordination control mode, so as to perform frequency modulation processing based on the determined power deviation command value.
14. The device for frequency modulation control according to claim 13, wherein the device for frequency modulation control is configured in a controller of the wind farm.
15. A controller comprising: a processor; and a memory having a computer program stored thereon, wherein the computer program, when executed by the processor, implements the method for frequency modulation control of a wind farm according to any one of claims I to 12.
16. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method for frequency modulation control of a wind farm according to any one of claims I to 12.
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| CN102510091B (en) * | 2011-12-01 | 2014-03-26 | 国电南瑞科技股份有限公司 | Coordinate control method suitable for real time scheduling and AGC (Automatic Gain Control) after large scale photovoltaic grid connection |
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| CN104767205B (en) * | 2015-01-29 | 2017-02-22 | 国家电网公司 | Method for establishing automatic generation control system of electric power system based on wind power plant access |
| US20180230969A1 (en) * | 2017-02-10 | 2018-08-16 | Leeward Asset Management, LLC | Methods and systems for wind farm frequency control |
| CN207117185U (en) * | 2017-08-24 | 2018-03-16 | 赫普科技发展（北京）有限公司 | A kind of power grid frequency modulation system based on electrode boiler |
| CN107732943B (en) * | 2017-11-28 | 2020-03-17 | 重庆科凯前卫风电设备有限责任公司 | Wind power grid-connected frequency modulation method and system based on double-fed asynchronous wind driven generator |
| CN109861242B (en) * | 2017-11-30 | 2021-04-16 | 中国电力科学研究院有限公司 | Power coordination control method and system for wind power participating in primary frequency modulation of power grid |
| CN108599253A (en) * | 2018-05-25 | 2018-09-28 | 国家电网公司西北分部 | A kind of combination control method of Wind turbines field grade primary frequency modulation and damping control |
| CN109638872B (en) * | 2018-10-16 | 2020-08-04 | 北京金风科创风电设备有限公司 | Method, device and system for controlling field control level power grid and storage medium thereof |
| CN110350592A (en) * | 2019-06-03 | 2019-10-18 | 南京国电南自电网自动化有限公司 | A kind of fast frequency responding power control system and method |
| CN111555307A (en) * | 2020-04-29 | 2020-08-18 | 云南电网有限责任公司电力科学研究院 | Method for photovoltaic power station to participate in regional power grid frequency adjustment |
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2020
- 2020-09-22 CN CN202011002768.4A patent/CN114256855A/en active Pending
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2021
- 2021-06-24 WO PCT/CN2021/102038 patent/WO2022062509A1/en active Application Filing
- 2021-06-24 AU AU2021349653A patent/AU2021349653A1/en active Pending
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| Publication number | Publication date |
|---|---|
| WO2022062509A1 (en) | 2022-03-31 |
| CN114256855A (en) | 2022-03-29 |
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