CN115549128A - Primary frequency modulation and AGC coordination control method and device and electronic equipment - Google Patents

Primary frequency modulation and AGC coordination control method and device and electronic equipment Download PDF

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CN115549128A
CN115549128A CN202211253922.4A CN202211253922A CN115549128A CN 115549128 A CN115549128 A CN 115549128A CN 202211253922 A CN202211253922 A CN 202211253922A CN 115549128 A CN115549128 A CN 115549128A
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power station
station
instruction
energy storage
agc
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邹祖冰
林忠伟
汤维贵
张子涵
姚维为
赵泽
柴兆瑞
周家伟
刘瑞阔
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China Three Gorges Corp
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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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The invention discloses a method and a device for coordinating and controlling primary frequency modulation and AGC (automatic gain control) and electronic equipment, wherein the method comprises the following steps: judging whether primary frequency modulation control is entered; if the primary frequency modulation control is not carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station for operation as a first limit and a second limit respectively, reserving preset proportional capacity without participating in output, and then distributing AGC commands to a wind power station, a photoelectric station and the energy storage power station for execution; if primary frequency modulation control is started, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a third limit and a fourth limit respectively, and releasing all the capacity to participate in output; calculating a primary frequency modulation instruction increment, and after the primary frequency modulation instruction increment is superposed with the obtained AGC instruction, distributing the primary frequency modulation instruction increment to a wind power station, a photoelectric station and an energy storage power station for execution; wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit. The technical scheme provided by the invention realizes a primary frequency modulation and AGC coordination control scheme which gives consideration to the energy storage life and the frequency modulation target.

Description

Primary frequency modulation and AGC coordination control method and device and electronic equipment
Technical Field
The invention relates to the field of power systems, in particular to a method and a device for coordinated control of primary frequency modulation and AGC and electronic equipment.
Background
At present, a strategy of coordination Control between primary frequency modulation, secondary frequency modulation (Automatic Generation Control, AGC) and primary frequency modulation of a wind and light storage station is a current research hotspot. Patent document CN114696342a discloses a fast frequency modulation control method for a wind and light storage station considering AGC cooperation, which discloses timings for adding and withdrawing AGC through primary frequency modulation, and discloses how a primary frequency modulation instruction and an AGC instruction are superimposed according to control directions of the primary frequency modulation instruction and the AGC instruction.
However, in the prior art, factors influencing the energy storage life are rarely considered, so that the energy storage life is influenced by frequent instruction changes generated during the coordination control of primary frequency modulation and AGC.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a method, an apparatus and an electronic device for coordinating and controlling primary frequency modulation and AGC, and implements a scheme for coordinating and controlling primary frequency modulation and AGC that considers both the energy storage life and the frequency modulation target.
According to a first aspect, an embodiment of the present invention provides a method for coordinated control of primary frequency modulation and AGC, where the method includes: judging whether primary frequency modulation control is entered; if the primary frequency modulation control is not carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a first limit and a second limit respectively, and reserving the capacity with preset proportion without participating in output; acquiring an AGC instruction, and distributing the AGC instruction to a wind power station, a light power station and the energy storage power station for execution; if primary frequency modulation control is carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a third limit and a fourth limit respectively, and releasing all capacity to participate in output; calculating a primary frequency modulation instruction increment, and after the primary frequency modulation instruction increment is superposed with the obtained AGC instruction, distributing the primary frequency modulation instruction increment to a wind power station, a light power station and the energy storage power station for execution; wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
Optionally, the method further comprises: judging whether to quit the primary frequency modulation control or not after the primary frequency modulation control is entered; if the primary frequency modulation control is quitted, acquiring AGC instructions distributed by the wind power station, the optical power station and the energy storage power station in the previous control period respectively; calculating instruction difference values of AGC instructions respectively distributed in the current control period of the wind power station, the optical power station and the energy storage power station and AGC instructions respectively distributed in the previous control period; if any command difference value is smaller than a preset command change dead zone, correcting an AGC command distributed in the current control period of the corresponding power station into an AGC command distributed in the previous control period; and if any command difference value is larger than the preset active command change step length, correcting the AGC command distributed in the current control period of the corresponding power station into the superposition sum of the AGC command distributed in the previous control period and the preset active command change step length in the control direction.
Optionally, the allocating the AGC instruction to be executed by a wind power station, a photovoltaic power station, and the energy storage power station includes: acquiring respective control modes of a wind power station, a photovoltaic power station and the energy storage power station, and judging whether the AGC instruction is effective or not, wherein the control modes comprise a field station centralized control mode, a power grid direct regulation mode and an exit control mode; if the AGC instruction is effective, calculating the difference value between the AGC instruction and the actual active power of the corresponding power station in the power grid direct modulation mode to obtain a station execution instruction; and distributing the station execution instruction to the corresponding power station under the station centralized control mode for execution.
Optionally, the determining whether the AGC instruction is valid includes: judging whether the active data of the grid-connected point stops refreshing within a preset time interval or not; if the refreshing is stopped, determining that the AGC command is invalid; if the refreshing is not stopped, judging whether the real active power of the grid-connected point is larger than a preset multiple of the total capacity of the whole power station or smaller than 0; and if the real active power of the grid-connected point is larger than the preset multiple of the total capacity of the whole power station or smaller than 0, determining that the AGC command is invalid.
Optionally, if the wind power station and the energy storage power station are in a station centralized control mode, and the photovoltaic power station is in a power grid direct regulation mode, allocating the station execution instruction to the corresponding power station in the station centralized control mode for execution, and including: calculating the instruction deviation between the active real power of the current grid-connected point and the AGC instruction; if the instruction deviation is larger than the preset station allowable deviation dead zone, distributing a station execution instruction for the wind power station according to the following formula
Figure BDA0003889153920000031
And distributing station execution instructions for the energy storage power station according to the following formula
Figure BDA0003889153920000032
In the formula (I), the compound is shown in the specification,
Figure BDA0003889153920000033
representing the portion of the wind power plant to which the instructions from the plant are distributed,
Figure BDA0003889153920000034
indicates that the station executes the instructions, and
Figure BDA0003889153920000035
Figure BDA0003889153920000036
which is representative of the AGC instruction(s),
Figure BDA0003889153920000037
represents the real active power of the photovoltaic plant,
Figure BDA0003889153920000038
representing the maximum possible active power of the wind power plant,
Figure BDA0003889153920000039
representing the minimum possible active power of the wind power plant,
Figure BDA00038891539200000310
represents the maximum charging power of the energy storage power station,
Figure BDA00038891539200000311
representing the maximum dischargeable power of the energy storage power station.
Optionally, if the wind power plant is in the station centralized control mode, and the photovoltaic power plant and the energy storage power plant are in the grid direct-modulation mode, the allocating the station execution instruction to the corresponding power plant in the station centralized control mode for execution includes: calculating the instruction deviation between the active real power of the current grid-connected point and the AGC instruction; if the instruction deviation is larger than the preset station allowable deviation dead zone, distributing a station execution instruction for the wind power station according to the following formula
Figure BDA00038891539200000312
In the formula (I), the compound is shown in the specification,
Figure BDA0003889153920000041
representing the portion of the wind power plant to which the instructions from the plant are distributed,
Figure BDA0003889153920000042
indicates that the station executes the instructions, and
Figure BDA0003889153920000043
Figure BDA0003889153920000044
is indicative of the AGC instruction(s),
Figure BDA0003889153920000045
represents the real active power of the photovoltaic plant,
Figure BDA0003889153920000046
the real active power of the energy storage power station is shown,
Figure BDA0003889153920000047
representing the maximum possible active power of the wind power plant,
Figure BDA0003889153920000048
representing the minimum possible active power of the wind power plant.
Optionally, the method further comprises: and when the SOC of the energy storage power station reaches the preset distance of the currently set SOC upper limit or SOC lower limit, performing interpolation processing on the maximum dischargeable power or the maximum charging power of the energy storage power station.
According to a second aspect, an embodiment of the present invention provides a device for coordinated control of primary frequency modulation and AGC, the device including: the primary frequency modulation starting judgment module is used for judging whether primary frequency modulation control is entered; the first energy storage parameter setting module is used for setting the upper and lower SOC (system on chip) limits of the energy storage power station in operation as a first limit and a second limit respectively if primary frequency modulation control is not performed, and reserving preset proportional capacity to not participate in output; the first instruction distribution module is used for acquiring an AGC instruction and distributing the AGC instruction to the wind power station, the optical power station and the energy storage power station for execution; the second energy storage parameter setting module is used for setting the upper and lower SOC (system on chip) limits of the energy storage power station in operation as a third limit and a fourth limit respectively and releasing all capacity to participate in output if primary frequency modulation control is performed; the second instruction distribution module is used for calculating a primary frequency modulation instruction increment, and distributing the primary frequency modulation instruction increment and the obtained AGC instruction to the wind power station, the optical power station and the energy storage power station for execution after the primary frequency modulation instruction increment is superposed; wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
According to a third aspect, an embodiment of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory having stored therein computer instructions, and the processor performing the method of the first aspect, or any one of the optional embodiments of the first aspect, by executing the computer instructions.
According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to thereby perform the method of the first aspect, or any one of the optional implementation manners of the first aspect.
The technical scheme provided by the application has the following advantages:
according to the technical scheme, the factors influencing the energy storage life such as the State of Charge (SOC) and the energy storage power impact are comprehensively considered, the energy storage output is carefully controlled each time, and the aims of prolonging the energy storage life and ensuring the power grid frequency not to exceed the limit are fulfilled by using the frequency modulation control strategy of changing the SOC. When the station does not enter primary frequency modulation control, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a first limit with a lower upper limit and a second limit with a higher lower limit respectively, reserving preset proportional capacity for the primary frequency modulation, not participating in the output, and then distributing AGC instructions of secondary frequency modulation to the wind power station, the optical power station and the energy storage power station for execution so as to reduce the use of the energy storage power station and prolong the service life of the energy storage power station; when primary frequency modulation control is carried out, the upper limit and the lower limit of the SOC of the energy storage power station are set to be a third limit with a higher upper limit and a fourth limit with a lower limit respectively, all the capacity is released to participate in output, and therefore the purpose that the frequency of the power grid is not out of limit is guaranteed. Through the control steps provided by the embodiment, a primary frequency modulation and AGC coordination control scheme which gives consideration to the energy storage life and the frequency modulation target is realized.
In addition, in an embodiment, the result that the fluctuation rate of a grid-connected point is increased due to wind and light fluctuation and the dynamic characteristics of field station adjustment is comprehensively considered, if the grid-connected point is in the process of participating in control by primary frequency modulation, and when the primary frequency modulation exits the control process, AGC (automatic gain control) instructions distributed by the wind power station, the optical power station and the energy storage power station in the previous control period are also obtained; calculating the instruction difference values of AGC instructions respectively distributed in the current control period of the wind power station, the photovoltaic power station and the energy storage power station and AGC instructions respectively distributed in the previous control period; and then judging whether the AGC command of the current control period needs to be corrected or not according to the size relation between the command difference and a preset command change dead zone and the size relation between the command difference and a preset active command change step length, and if so, adjusting the AGC command of the current control period according to a corresponding correction strategy. Through the correction steps, the influence of wind and light volatility and station regulation dynamic characteristics on the electric energy quality is reduced, the power impact when the primary frequency modulation exits is reduced, and undisturbed switching between the primary frequency modulation and AGC control is realized.
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The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic diagram illustrating steps of a primary frequency modulation and AGC coordination control method according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for coordinating and controlling primary frequency modulation and AGC according to an embodiment of the present invention;
FIG. 3 is a graph illustrating test results without considering primary frequency modulation drop-out effects in one embodiment of the present invention;
FIG. 4 is a diagram illustrating test results considering primary frequency modulation drop-out effects in one embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a configuration of a primary frequency modulation and AGC coordination control device according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, in an embodiment, a method for coordinating and controlling primary frequency modulation and AGC specifically includes the following steps:
step S101: and judging whether to enter primary frequency modulation control.
Step S102: and if the primary frequency modulation control is not carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a first limit and a second limit respectively, and reserving the preset proportional capacity without participating in output.
Step S103: and acquiring an AGC instruction, and distributing the AGC instruction to a wind power station, a light power station and an energy storage power station for execution.
Step S104: and if primary frequency modulation control is carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a third limit and a fourth limit respectively, and releasing all the capacity to participate in output.
Step S105: and calculating primary frequency modulation instruction increment, and after the primary frequency modulation instruction increment is superposed with the obtained AGC instruction, distributing the primary frequency modulation instruction increment to a wind power station, a photoelectric station and an energy storage power station for execution. Wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
Specifically, the energy storage service life factors such as the energy storage SOC and the energy storage power impact are comprehensively considered, the energy storage output is carefully carried out each time, and the aims of prolonging the energy storage service life and ensuring that the power grid frequency is not out of limit are fulfilled by using the frequency modulation control strategy of the variable SOC.
First, it is necessary to determine whether primary modulation is involved in the current control period. Before this step is performed, data acquisition is performed so that the calculation processes of the current and subsequent steps can be performed by the acquired data. The system monitors the frequency, current and the like of a grid-connected point in real time,The method comprises the steps of monitoring variables such as voltage and active values, monitoring variable parameters such as active power, maximum active power and minimum active power of a wind power station, a light power station and an energy storage power station, and presetting related parameters. The parameters specifically required include: the real-time power-generating values of the wind power station, the photovoltaic power station and the energy storage power station are sampled, and the frequency, the current, the voltage and the real-time power-generating values of the grid-connected points of the wind and light energy storage station are transmitted to the controller through a communication link so as to be used for strategy real-time judgment. Presetting a plurality of parameters including a system rated frequency f N (typically 50 Hz), percentage of reserve capacity for energy storage, frequency variation dead band f of primary frequency modulation D1 The difference rate delta% of primary frequency modulation control is preset with the variation limit value of the up-modulation active power of the wind and light storage station
Figure BDA0003889153920000071
Active power variation limiting value adjusted under wind and light storage station
Figure BDA0003889153920000072
Wind power station active instruction change step length, photoelectric station active instruction change step length and wind power station maximum available active power
Figure BDA0003889153920000073
Minimum possible active power of wind power station
Figure BDA0003889153920000074
Maximum possible active power of photoelectric station
Figure BDA0003889153920000075
Minimum possible active power of photovoltaic station
Figure BDA0003889153920000076
Active instruction change step length of energy storage power station, active instruction change dead zone of wind power station, active instruction change dead zone of photoelectric station, active instruction change dead zone of energy storage power station and maximum dischargeable power of energy storage power station
Figure BDA0003889153920000077
Maximum chargeable capacity of energy storage power stationPower of
Figure BDA0003889153920000078
(it should be noted that,
Figure BDA0003889153920000079
the physical meaning of (1) is the maximum chargeable power of the current energy storage power station, the scalar of the numerical value is a positive value, when the numerical value is added with a negative sign in front, the direction of charging needs to be distinguished from charging and discharging, and the charging is negative), and the state of charge (SOC) of the energy storage system.
Then, judging whether the deviation between the current grid-connected point frequency and the system rated frequency exceeds a preset primary frequency modulation frequency change dead zone f D1 If the dead zone is exceeded, the comprehensive control of primary frequency modulation and secondary frequency modulation is carried out, otherwise, the conventional secondary frequency modulation control is carried out, and therefore the judgment of whether the primary frequency modulation control is carried out is achieved.
If primary frequency modulation control is not started, in a current scene, the upper limit and the lower limit of the energy storage SOC are respectively and automatically adjusted to a lower first limit and a higher second limit, for example, the upper limit and the lower limit are respectively 0.8 and 0.2 (for example, not limited), and an up-regulation margin of a preset proportion of energy storage capacity (for example, 10%) is reserved for the primary frequency modulation, that is, 90% of the capacity of the energy storage system is used for secondary frequency modulation, and 10% of the capacity is used for primary frequency modulation, so as to improve the service life of the energy storage power station, maintain the performance of the energy storage power station, and ensure that the energy storage power station can better support the primary frequency modulation of the power grid when the primary frequency modulation participates, and the effect of the primary frequency modulation cannot be influenced by the performance reduction of the energy storage. And then, distributing the AGC instruction of the secondary frequency modulation to a wind power station, an optical power station and an energy storage power station for execution.
If the deviation of the current grid-connected point frequency and the system rated frequency exceeds a primary frequency modulation frequency change dead zone f D1 Then, the primary frequency modulation control is entered. In the current scenario, the upper and lower limits of the energy storage SOC are automatically adjusted to a third higher limit and a fourth lower limit, respectively, for example, the upper and lower limits are 0.9 and 0.1, respectively; and the preset proportion reserved for the primary frequency modulation in the secondary frequency modulation is used (E.g., 10%) of the energy storage capacity. Therefore, the effects of primary frequency modulation and secondary frequency modulation are ensured in a mode of energy storage full-rated output, and the purpose that the frequency of a power grid is not out of limit is ensured.
In the present embodiment, the primary fm-command increment Δ P is calculated as follows 1 。
Figure BDA0003889153920000081
In the formula,. DELTA.P 1 I.e. the incremental value of the active power instruction, P, under the control of primary frequency modulation n Rated power of wind and light storage station, f N For the nominal frequency of the system, f D1 The delta% is a dead zone boundary value of primary frequency modulation control, and the difference rate of the primary frequency modulation control of the wind and light storage station.
Then, the primary frequency modulation instruction is increased by delta P 1 And transmitting the instruction to a coordination control module of primary frequency modulation and AGC for instruction superposition, wherein the principle of primary frequency modulation priority is required to be followed during superposition, namely, the current AGC instruction adjusting direction is judged according to the current AGC instruction value and the real active power value of the wind and light storage station grid-connected point, if the AGC instruction is the same as the adjusting direction of the primary frequency modulation instruction increment, the instruction is directly superposed, otherwise, AGC control is locked, and only the instruction of primary frequency modulation is responded. And finally, obtaining a final functional control instruction of the wind and light storage station, and issuing the final functional control instruction to the wind power station/the light power station/the energy storage power station according to the principle of energy storage priority regulation, namely, firstly using the energy storage to meet the current active regulation requirement, and if and only if the regulation margin of the energy storage is not enough, then using the light power station to respond to the active regulation requirement, and finally using the wind power station to participate in regulation. Therefore, the advantage of rapid adjustment is achieved based on the energy storage power station, the rapidity of frequency adjustment is guaranteed when primary frequency modulation is responded, and the operation safety of a power grid is further guaranteed.
Through the SOC-variable frequency modulation control strategy, the embodiment of the invention provides a coordination control scheme which can give consideration to both the energy storage life and the frequency modulation target.
Specifically, as shown in fig. 2, in an embodiment, the method for coordinating and controlling primary frequency modulation and AGC according to an embodiment of the present invention further includes the following steps:
the method comprises the following steps: and judging whether to exit the primary frequency modulation control or not after entering the primary frequency modulation control.
Step two: and if the primary frequency modulation control is quitted, acquiring AGC instructions distributed by the wind power station, the optical power station and the energy storage power station in the previous control period respectively.
Step three: and calculating the instruction difference values of the AGC instructions respectively distributed in the current control period of the wind power station, the photovoltaic power station and the energy storage power station and the AGC instructions respectively distributed in the previous control period.
Step four: and if any command difference value is smaller than the preset command change dead zone, correcting the AGC command distributed in the current control period of the corresponding power station into the AGC command distributed in the previous control period.
Step five: and if any command difference value is larger than the preset active command change step length, correcting the AGC command distributed in the current control period of the corresponding power station into the superposition sum of the AGC command distributed in the previous control period and the preset active command change step length in the control direction.
Specifically, in order to reduce the fluctuation of a grid connection point caused by the fact that the wind power station, the optical power station and the energy storage power station are adjusted greatly, and meanwhile, the wind power station, the optical power station and the energy storage power station are guaranteed not to be impacted by power, the influence of deep charging and deep discharging on the energy storage power station is reduced, a safe operation module is designed and used for executing the first step to the fifth step. The module can ensure the stability of a wind power station, a photoelectric station and an energy storage power station in the secondary frequency modulation process, and can ensure that the active fluctuation rate of a grid-connected point is reduced when primary frequency modulation control exits. When the frequency deviation between the current grid-connected point frequency and the system rated frequency is less than a preset primary frequency modulation frequency change dead zone f D1 And then, the primary frequency modulation control needs to be quitted.
When the primary frequency modulation control is quitted, firstly, the actual sending values and the distributed AGC instruction values of the wind power station, the optical power station and the energy storage power station in the previous control period are recorded, and the AGC instruction values sent to the wind power station, the optical power station and the energy storage power station in the current control period are collected in real time. The method comprises the steps that a first period of operation of the wind and light storage station cannot acquire a command value of a previous control period, so that whether the first period of operation of the wind and light storage station is the current first period or not needs to be judged, if the first period is the current first period, an active command value of the previous control period is made to be equal to a current actual value, and if not, the command value of the previous period is normally acquired.
And secondly, calculating instruction difference values of AGC instructions distributed by the current control periods of the wind power station, the photovoltaic power station and the energy storage power station respectively and AGC instructions distributed by the previous control period respectively, comparing the calculated instruction difference values with a preset instruction change dead zone and a preset active instruction change step length one by one, and if the instruction difference values are smaller than the preset instruction change dead zone, indicating that the amplitude of the instruction change is too small, and the output of the field station cannot be greatly influenced even if the instruction change is not carried out, so that the AGC instructions distributed corresponding to the current control period of the power station are corrected into the AGC instructions distributed by the previous control period, and the frequency fluctuation of a grid-connected point is reduced. For example: and after the difference is made between the AGC command distributed in the current control period of the wind power station and the AGC command distributed in the previous control period, comparing the command difference with a preset command change dead zone, and if the command difference is smaller than the preset command change dead zone, the wind power station does not execute the AGC command distributed in the current control period but continues to execute the AGC command distributed in the previous control period. In addition, the instruction difference value of each power station is compared with the preset active instruction change step length, if the instruction difference value is larger than the preset active instruction change step length, the AGC instruction change of the current control period is over large, and in order to reduce the frequency fluctuation of a grid-connected point, the AGC instruction of the corresponding power station is updated in the control direction according to the fact that the AGC instruction distributed in the current control period = the AGC instruction distributed in the last control period + the preset active instruction change step length; if the instruction difference value of the corresponding power station is between the two value ranges, the power station only needs to keep the AGC instruction distributed in the previous control period. Through the steps, the power impact when the primary frequency modulation exits is reduced, and undisturbed switching is realized.
Specifically, in an embodiment, the step S103 specifically includes the following steps:
step six: and acquiring respective control modes of the wind power station, the optical power station and the energy storage power station, and judging whether an AGC instruction is effective, wherein the control modes comprise a field station centralized control mode, a power grid direct regulation mode and an exit control mode.
Step seven: and if the AGC instruction is effective, calculating the difference value between the AGC instruction and the actual active power of the corresponding power station in the power grid direct modulation mode to obtain a station execution instruction.
Step eight: and distributing the station execution instruction to the corresponding power station under the station centralized control mode for execution.
Specifically, the embodiment of the invention provides a specific frequency modulation control strategy, and aims at that a wind power station, a photovoltaic power station and an energy storage power station are respectively in different modes, a station execution instruction which is actually required to be executed by the power station and is only in a station centralized control mode is calculated, and then the station execution instruction is distributed, so that the instruction distribution accuracy is improved.
The field station centralized control mode represents that the power station executes an instruction issued by a wind and light storage field station control strategy; the power grid direct modulation mode represents that the power station directly receives a control instruction issued by a power grid, in other words, the control right of the power station does not belong to the wind and light storage station any more, so that the instruction needs to be eliminated when the station carries out secondary frequency modulation; if the plant is operating in the exit control mode, the characterization plant does not accept any instructions. Three power stations including a wind power station, a photovoltaic power station and an energy storage power station and three operation modes including field station centralized control, power grid direct regulation and exit control can be combined to form 27 AGC command distribution strategies, as shown in table 1, wherein 0 represents the field station centralized control mode, 1 represents the power grid direct regulation mode, and 2 represents the exit control.
TABLE 1 summary of AGC-participated regulation control modes of wind and light storage station
Figure BDA0003889153920000111
Figure BDA0003889153920000121
For example: if the wind power station, the optical power station and the energy storage power station work in the mode 8, the wind power station is in a field station centralized control mode, the energy storage power station is in a power grid direct regulation mode, and the optical power station exits from the control mode, so that the optical power station and the energy storage power station do not participate in the distribution of AGC instructions, and the part of the real power of the energy storage power station needs to be deducted when the AGC instructions are distributed to the wind power station, namely the real power of the energy storage power station is deducted from the AGC instructions sent by a grid-connected point to obtain field station execution instructions, and the wind power station only distributes the part of the field station execution instructions according to the working conditions of the wind power station. Based on the above steps, when the validity verification of the AGC command passes, the embodiment provides 27 command allocation strategies, which satisfy the full-scene processing requirement.
Specifically, in an embodiment, the step six specifically includes the following steps:
step nine: and judging whether the active data of the grid-connected point stops refreshing in a preset time interval.
Step ten: and if the refreshing is stopped, determining that the AGC command is invalid.
Step eleven: if the refreshing is not stopped, judging whether the real active power of the grid-connected point is larger than a preset multiple of the total capacity of the whole power station or smaller than 0;
step twelve: and if the real active power of the grid-connected point is larger than the preset multiple of the total capacity of the whole power station or smaller than 0, determining that the AGC instruction is invalid.
Specifically, in this embodiment, it is first determined whether active data of a point of connection stops refreshing within a preset time interval, and if the active data of the point of connection does not stop refreshing, the AGC instruction to be allocated is invalid. The reason is that the actual active output of the grid-connected point fluctuates continuously due to the large fluctuation of wind and light, if the grid-connected point is not refreshed within a certain time interval, a problem occurs in a data sampling link, all currently acquired data lose credibility, and then an AGC command generated according to the acquired data also loses feasibility, so that the AGC control needs to be stopped in time, and the reliability of a power system is ensured. And then, if the active data of the grid-connected point does not stop refreshing, continuously judging whether the real active power of the grid-connected point is greater than a preset multiple (for example, 1.3 times) of the total capacity of the whole power station or less than 0, if the real active power of the grid-connected point is greater than the preset multiple of the total capacity of the whole power station or less than 0, determining that the AGC command to be distributed exceeds the adjustable range of the whole power station and is an untrusted command, and if the accidental tracking possibly causes the frequency fluctuation to be increased, thereby determining that the AGC command to be distributed is invalid.
Specifically, in an embodiment, if the wind power station and the energy storage power station are in the station centralized control mode, and the photovoltaic power station is in the grid direct-regulation mode, the step eight specifically includes the following steps:
step thirteen: calculating the instruction deviation between the active real power of the current grid-connected point and the AGC instruction;
fourteen steps: if the command deviation is larger than the preset station allowable deviation dead zone, distributing station execution commands for the wind power station according to the following formula
Figure BDA0003889153920000131
And distributing station execution instructions for the energy storage power station according to the following formula
Figure BDA0003889153920000132
In the formula (I), the compound is shown in the specification,
Figure BDA0003889153920000133
representing the portion of the wind power plant to which the instructions from the plant are distributed,
Figure BDA0003889153920000134
indicates that the station executes the instructions, and
Figure BDA0003889153920000135
Figure BDA0003889153920000136
which is indicative of an AGC command,
Figure BDA0003889153920000137
represents the real active power of the photovoltaic plant,
Figure BDA0003889153920000138
representing the maximum possible active power of the wind power plant,
Figure BDA0003889153920000139
representing the minimum possible active power of the wind power plant,
Figure BDA00038891539200001310
represents the maximum charging power of the energy storage power station,
Figure BDA00038891539200001311
representing the maximum dischargeable power of the energy storage power station.
Specifically, the embodiment of the invention provides a specific AGC instruction allocation strategy for a wind power station and an energy storage power station in a station centralized control mode and a photovoltaic power station in a grid direct-regulation mode, so that the accuracy of AGC instruction allocation is further improved. Firstly, calculating the active real power of the current grid-connected point
Figure BDA00038891539200001312
And point of presence AGC commands
Figure BDA00038891539200001313
Deviation therebetween
Figure BDA00038891539200001314
Figure BDA00038891539200001315
If the current deviation is smaller than the preset station allowable deviation dead zone, keeping the current instruction unchanged, and avoiding the condition that the instruction is too frequent and the station burden is increased; and if the current deviation is larger than the preset station allowable deviation dead zone, entering the next step of AGC command distribution.
Wherein, because the wind power station and the energy storage power station are in the station centralized control mode, the real station execution instruction needs to be calculated
Figure BDA00038891539200001316
Namely, the real power value of the optical power station is deducted from the AGC instruction. Then the station executes the instruction
Figure BDA0003889153920000141
And distributing the power to wind power stations and energy storage power stations. The specific meaning of the above two-group allocation strategy formula is explained as follows:
for formula
Figure BDA0003889153920000142
Explanation of (1).
When it occurs
Figure BDA0003889153920000143
In time, the current wind power station instruction is the maximum value of the power which can be generated by the current wind power station, and the current wind power station instruction can meet the field station execution instruction only when the wind power station and the energy storage power station need to generate power together
Figure BDA0003889153920000144
So as to ensure the minimum air abandoning rate; if it is present
Figure BDA0003889153920000145
And is
Figure BDA0003889153920000146
The method indicates that the current station execution instruction can be satisfied by the wind power station, and the redundant electric energy can be received by utilizing the charging characteristic of the stored energy to simultaneously satisfy the low wind abandon rate and the tracking accuracy, so that the instruction given to the wind power station at present is still the current maximum possible power
Figure BDA0003889153920000147
If it is present
Figure BDA0003889153920000148
(it should be noted that,
Figure BDA0003889153920000149
the physical meaning of (1) is the maximum chargeable power of the current energy storage power station, the scalar of the value is a positive value, and a negative sign is added in the front because charging and discharging need to be distinguished, and charging is negative) shows that although the energy storage is charged at the maximum power, the wind power station still generates excess electric energy, so that the power must be limited to meet the tracking accuracy, and therefore the current wind power station instruction is set as
Figure BDA00038891539200001410
To meet tracking accuracy; at the same time, it also needs to judge
Figure BDA00038891539200001411
Whether or not greater than
Figure BDA00038891539200001412
If the minimum value is larger than the preset value, the current instruction value is not lower than the minimum value of the possible active power of the wind power plant
Figure BDA00038891539200001413
According to
Figure BDA00038891539200001414
The output is only needed, if the output is smaller than the value which indicates that the current instruction exceeds the adjusting range of the wind power station, the minimum possible power value of the wind power station is needed
Figure BDA00038891539200001415
The power generation is carried out, and the overlarge frequency fluctuation of the grid-connected point is avoided.
For formula
Figure BDA0003889153920000151
Explanation of (1).
If it is currently
Figure BDA0003889153920000152
Shows that energy storage and power generation are currently required to ensure tracking accuracy, and if so
Figure BDA0003889153920000153
The energy storage can not keep up with the power grid command although the energy storage is discharged at the maximum dischargeable power, so the energy storage must be discharged at the maximum dischargeable power
Figure BDA0003889153920000154
If it is not
Figure BDA0003889153920000155
And is
Figure BDA0003889153920000156
Shows that the current energy storage power station does not need to discharge with the maximum dischargeable power
Figure BDA0003889153920000157
Instruction set of energy storage power station
Figure BDA0003889153920000158
If it is currently
Figure BDA0003889153920000159
The method shows that the charging characteristic of the stored energy can be utilized to simultaneously meet the requirements of low wind abandon rate and tracking accuracy, and the judgment is continued
Figure BDA00038891539200001510
Whether or not greater than
Figure BDA00038891539200001511
If greater than
Figure BDA00038891539200001512
The energy storage station is instructed to be charged with the maximum chargeable active power
Figure BDA00038891539200001513
If it is present
Figure BDA00038891539200001514
To ensure current lowCurtailment rate, requiring the energy storage plant to be charged at maximum chargeable power, with an order of
Figure BDA00038891539200001515
Specifically, in an embodiment, if the wind power plant is in the plant centralized control mode, and the photovoltaic power plant and the energy storage power plant are in the grid direct regulation mode, the step eight specifically includes the following steps:
step fifteen: and calculating the instruction deviation between the active real power and the AGC instruction of the current grid-connected point.
Sixthly, the steps are as follows: if the command deviation is larger than the preset station allowable deviation dead zone, distributing station execution commands for the wind power station according to the following formula
Figure BDA00038891539200001516
In the formula (I), the compound is shown in the specification,
Figure BDA00038891539200001517
representing the portion of the wind power plant to which the instructions from the plant are distributed,
Figure BDA00038891539200001518
indicates that the station executes the instructions, and
Figure BDA00038891539200001519
Figure BDA00038891539200001520
which is indicative of an AGC command,
Figure BDA00038891539200001521
represents the real active power of the photovoltaic plant,
Figure BDA00038891539200001522
the real active power of the energy storage power station is shown,
Figure BDA00038891539200001523
representing the maximum possible active power of the wind power plant,
Figure BDA0003889153920000161
representing the minimum possible active power of the wind power plant.
Specifically, the embodiment of the invention also provides a specific AGC instruction allocation strategy aiming at the situation that only the wind power station is in the station centralized control mode, and the optical power station and the energy storage power station are in the power grid direct regulation mode, so that the AGC instruction allocation accuracy is further improved. Firstly, calculating the active real power of the current grid-connected point
Figure BDA0003889153920000162
And point of presence AGC commands
Figure BDA0003889153920000163
Deviation between
Figure BDA0003889153920000164
Figure BDA0003889153920000165
If the current deviation is smaller than the preset station allowable deviation dead zone, keeping the current instruction unchanged; and if the current deviation is larger than the preset station allowable deviation dead zone, entering the next step of AGC command distribution.
Wherein, because the wind power station and the energy storage power station are in the station centralized control mode, the real station execution instruction needs to be calculated
Figure BDA0003889153920000166
Namely, the real power values of the optical power station and the energy storage power station are deducted from the AGC instruction. Then the station executes the instruction
Figure BDA0003889153920000167
Only to wind power plants. When distributing, the station executes the instruction
Figure BDA0003889153920000168
The maximum power generation capability of the wind field
Figure BDA0003889153920000169
Minimum possible power of wind farm
Figure BDA00038891539200001610
Comparing, if two limits are exceeded, the wind power station is required to be instructed to generate power according to the maximum power generation capacity of the wind field
Figure BDA00038891539200001611
Or minimum possible power of wind field
Figure BDA00038891539200001612
And generating power, and if the actual field station execution instructions fall in the range, distributing all actual field station execution instructions to the wind power station for execution, thereby ensuring the minimum wind abandon rate and the tracking accuracy of the wind power station.
Specifically, in an embodiment, the method for coordinating and controlling primary frequency modulation and AGC provided in the embodiment of the present invention further includes the following steps:
seventeen steps: and when the SOC of the energy storage power station reaches the preset distance of the currently set SOC upper limit or SOC lower limit, performing interpolation processing on the maximum dischargeable power or the maximum charging power of the energy storage power station.
Specifically, in AGC control, when the SOC state of the energy storage power station is close to the upper and lower limit limits, interpolation processing is carried out on the maximum power generation capacity and the minimum power generation capacity of the energy storage field station of the energy storage system, the upper limit and the lower limit of the SOC are respectively 0.8 and 0.2, the interpolation processing is shown as the following formula, and therefore the energy storage power station can be enabled to slowly return to zero, sudden exit of the energy storage power station is avoided, and the service life of the energy storage power station is further prolonged.
Figure BDA0003889153920000171
In the formula (I), the compound is shown in the specification,
Figure BDA0003889153920000172
representing the maximum or minimum possible power of the energy storage plant.
Specifically, in a specific application embodiment, a wind-solar energy storage station and a grid model in an existing Real-Time Digital simulation System (RTDS) are utilized to perform Real-Time high-precision simulation. Setting the wind power rated power to 425MW, the wind field reserved capacity to 10% of the wind power rated power, and the wind power generation capacity to 382.5MW; the photovoltaic rated power is 75MW, the reserved capacity of the photovoltaic power station is 10% of the photovoltaic rated power, and the photovoltaic power generation capacity is 67.5MW; the rated power of the stored energy is +/-140 MW. The power grid issues a power limiting instruction at 180s intervals, and the instruction is 80%, 60%, 40%, 20%, 40%, 60% and 80% of total rated power of wind-solar energy storage in sequence. After the power grid issues the instruction, the frequency is judged to not exceed the dead zone, the instruction is not abnormal, and then the conventional secondary frequency modulation control is carried out. The wind power, the photovoltaic power and the stored energy are subjected to active power regulation according to a scheduling instruction, and the wind power and the photovoltaic power are used for generating power according to a maximum power tracking point, so that the wind abandoning and light abandoning rate is reduced to the maximum extent. Through experimental verification, based on the technical scheme provided by the application, when the power command sent by the power grid is changed, the total-station active power can better track the total-station active power command.
In addition, the effectiveness of the primary frequency modulation when the AGC control is exited is tested. At 19 seconds, a down-regulated frequency signal of 49.85Hz is sent for 20s by the signal generator. Fig. 3 is a test result without considering the primary fm drop-out effect, and fig. 4 is a test result with considering the primary fm drop-out effect. Comparing and observing fig. 3 and fig. 4, it can be easily found that the embodiment of the invention considers the influence of the exiting primary frequency modulation on the power of the grid-connected point, and when the frequency is recovered to the normal range, the stored energy is dropped to the target value twice according to the set step length (the set value under the working condition is 15 MW).
Through the steps, according to the technical scheme provided by the application, the factors influencing the energy storage life such as the State of Charge (SOC) and the energy storage power impact are comprehensively considered, the energy storage output is carefully controlled each time, and the aims of prolonging the energy storage life and ensuring the power grid frequency not to exceed the limit are fulfilled at the same time by using the frequency modulation control strategy of the variable SOC. When the station does not enter primary frequency modulation control, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a first limit with a lower upper limit and a second limit with a higher lower limit respectively, reserving preset proportional capacity for the primary frequency modulation, not participating in the output, and then distributing AGC instructions of secondary frequency modulation to the wind power station, the optical power station and the energy storage power station for execution so as to reduce the use of the energy storage power station and prolong the service life of the energy storage power station; when primary frequency modulation control is carried out, the upper limit and the lower limit of the SOC of the energy storage power station are set to be a third limit with a higher upper limit and a fourth limit with a lower limit respectively, all the capacity is released to participate in output, and therefore the purpose that the frequency of the power grid is not out of limit is guaranteed. Through the control steps provided by the embodiment, a primary frequency modulation and AGC coordination control scheme which gives consideration to the energy storage life and the frequency modulation target is realized.
In addition, in an embodiment, the result that the fluctuation rate of a grid-connected point is increased due to wind and light fluctuation and the dynamic characteristics of field station adjustment is comprehensively considered, if the grid-connected point is in the process of participating in control by primary frequency modulation, and when the primary frequency modulation exits the control process, AGC (automatic gain control) instructions distributed by the wind power station, the optical power station and the energy storage power station in the previous control period are also obtained; calculating instruction difference values of AGC instructions respectively distributed in the current control period of the wind power station, the optical power station and the energy storage power station and AGC instructions respectively distributed in the previous control period; and then judging whether the AGC command of the current control period needs to be corrected according to the size relation between the command difference value and a preset command change dead zone and the size relation between the command difference value and a preset active command change step length, and if so, adjusting the AGC command of the current control period according to a corresponding correction strategy. Through the correction steps, the influence of wind and light volatility and station regulation dynamic characteristics on the electric energy quality is reduced, the power impact when the primary frequency modulation exits is reduced, and undisturbed switching between the primary frequency modulation and AGC control is realized.
As shown in fig. 5, the present embodiment further provides a coordinated control apparatus for primary frequency modulation and AGC, which includes:
and a primary frequency modulation starting judgment module 101, configured to judge whether to enter primary frequency modulation control. For details, refer to the related description of step S101 in the above method embodiment, and no further description is provided here.
The first energy storage parameter setting module 102 is configured to set an upper limit and a lower limit of an SOC of the energy storage power station in operation as a first limit and a second limit respectively if primary frequency modulation control is not performed, and reserve a preset proportional capacity without participating in output. For details, refer to the related description of step S102 in the above method embodiment, and no further description is provided here.
And the first instruction distribution module 103 is used for acquiring an AGC instruction and distributing the AGC instruction to the wind power station, the optical power station and the energy storage power station for execution. For details, refer to the related description of step S103 in the above method embodiment, and no further description is provided here.
And the second energy storage parameter setting module 104 is configured to set the upper and lower SOC limits of the energy storage power station to be a third limit and a fourth limit, respectively, if primary frequency modulation control is performed, and release all the capacity to participate in output. For details, refer to the related description of step S104 in the above method embodiment, and no further description is provided here.
And the second instruction distribution module 105 calculates the primary frequency modulation instruction increment, and distributes the primary frequency modulation instruction increment and the obtained AGC instruction to the wind power station, the photoelectric station and the energy storage power station for execution after the primary frequency modulation instruction increment is superposed. For details, refer to the related description of step S105 in the above method embodiment, and no further description is provided herein.
Wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
The primary frequency modulation and AGC coordination control device provided in the embodiment of the present invention is configured to execute the primary frequency modulation and AGC coordination control method provided in the above embodiment, and the implementation manner and the principle thereof are the same, and details are referred to the related description of the above method embodiment and are not described again.
Fig. 6 shows an electronic device according to an embodiment of the present invention, where the device includes a processor 901 and a memory 902, which may be connected by a bus or by other means, and fig. 6 illustrates an example of a connection by a bus.
Processor 901 may be a Central Processing Unit (CPU). The Processor 901 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 902, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules corresponding to the methods in the above-described method embodiments. The processor 901 executes various functional applications and data processing of the processor by executing non-transitory software programs, instructions and modules stored in the memory 902, that is, implements the methods in the above-described method embodiments.
The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 901, and the like. Further, the memory 902 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 902 may optionally include memory located remotely from the processor 901, which may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 902, which when executed by the processor 901 performs the methods in the above-described method embodiments.
The specific details of the electronic device may be understood by referring to the corresponding related descriptions and effects in the above method embodiments, and are not described herein again.
Those skilled in the art will understand that all or part of the processes in the methods of the embodiments described above may be implemented by instructing the relevant hardware through a computer program, and the implemented program may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk Drive (Hard Disk Drive, abbreviated as HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (10)

1. A method for coordinated control of primary frequency modulation and AGC, the method comprising:
judging whether primary frequency modulation control is entered;
if the primary frequency modulation control is not carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a first limit and a second limit respectively, and reserving the capacity with preset proportion without participating in output;
acquiring an AGC instruction, and distributing the AGC instruction to a wind power station, a light power station and the energy storage power station for execution;
if primary frequency modulation control is carried out, setting the upper limit and the lower limit of the SOC of the energy storage power station in operation as a third limit and a fourth limit respectively, and releasing all capacity to participate in output;
calculating a primary frequency modulation instruction increment, and after the primary frequency modulation instruction increment is superposed with the obtained AGC instruction, distributing the primary frequency modulation instruction increment to a wind power station, a light power station and the energy storage power station for execution;
wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
2. The method of claim 1, further comprising:
judging whether to quit the primary frequency modulation control or not after the primary frequency modulation control is entered;
if the primary frequency modulation control is quitted, acquiring AGC instructions distributed by the wind power station, the optical power station and the energy storage power station in the previous control period respectively;
calculating instruction difference values of AGC instructions respectively distributed in the current control period of the wind power station, the optical power station and the energy storage power station and AGC instructions respectively distributed in the previous control period;
if any command difference value is smaller than a preset command change dead zone, correcting an AGC command distributed in the current control period of the corresponding power station into an AGC command distributed in the previous control period;
and if any command difference value is larger than the preset active command change step length, correcting the AGC command distributed in the current control period of the corresponding power station into the superposition sum of the AGC command distributed in the previous control period and the preset active command change step length in the control direction.
3. The method of claim 1, wherein said distributing the AGC commands to wind, photovoltaic, and energy storage power plants comprises:
acquiring respective control modes of a wind power station, a photovoltaic power station and the energy storage power station, and judging whether the AGC instruction is effective or not, wherein the control modes comprise a field station centralized control mode, a power grid direct regulation mode and an exit control mode;
if the AGC instruction is effective, calculating the difference value between the AGC instruction and the actual active power of the corresponding power station in the power grid direct modulation mode to obtain a station execution instruction;
and distributing the station execution instruction to the corresponding power station under the station centralized control mode for execution.
4. The method of claim 3, wherein said determining whether the AGC command is valid comprises:
judging whether the active data of the grid-connected point stops refreshing within a preset time interval or not;
if the refreshing is stopped, determining that the AGC command is invalid;
if the refreshing is not stopped, judging whether the real active power of the grid-connected point is larger than a preset multiple of the total capacity of the whole power station or smaller than 0;
and if the real active power of the grid-connected point is larger than the preset multiple of the total capacity of the whole power station or smaller than 0, determining that the AGC instruction is invalid.
5. The method of claim 3, wherein if the wind power station and the energy storage power station are in the station centralized control mode and the photovoltaic power station is in the grid direct-regulation mode, the allocating the station execution command to the corresponding power station in the station centralized control mode for execution comprises:
calculating the instruction deviation between the active real power of the current grid-connected point and the AGC instruction;
if the instruction deviation is larger than the preset station allowable deviation dead zone, distributing a station execution instruction for the wind power station according to the following formula
Figure FDA0003889153910000021
And distributing station execution instructions for the energy storage power station according to the following formula
Figure FDA0003889153910000031
In the formula (I), the compound is shown in the specification,
Figure FDA0003889153910000032
representing the part of the wind power plant to which the execution instructions from the plant are distributed,
Figure FDA0003889153910000033
indicates that the station executes the instructions, and
Figure FDA0003889153910000034
Figure FDA0003889153910000035
which is representative of the AGC instruction(s),
Figure FDA0003889153910000036
represents the real active power of the photovoltaic plant,
Figure FDA0003889153910000037
representing the maximum possible active power of the wind power plant,
Figure FDA0003889153910000038
representing the minimum possible active power of the wind power plant,
Figure FDA0003889153910000039
represents the maximum charging power of the energy storage power station,
Figure FDA00038891539100000310
representing the maximum dischargeable power of the energy storage power station.
6. The method of claim 3, wherein if the wind power plant is in the plant centralized control mode and the photovoltaic power plant and the energy storage power plant are in the grid direct-regulating mode, the allocating the plant execution instruction to the corresponding power plant in the plant centralized control mode for execution comprises:
calculating the instruction deviation between the active real power of the current grid-connected point and the AGC instruction;
if the instruction deviation is larger than the preset station allowable deviation dead zone, distributing a station execution instruction for the wind power station according to the following formula
Figure FDA00038891539100000311
In the formula (I), the compound is shown in the specification,
Figure FDA00038891539100000312
representing the portion of the wind power plant to which the instructions from the plant are distributed,
Figure FDA00038891539100000313
indicates that the station is executing instructions, and
Figure FDA00038891539100000314
Figure FDA00038891539100000315
which is representative of the AGC instruction(s),
Figure FDA00038891539100000316
represents the real active power of the photovoltaic plant,
Figure FDA00038891539100000317
the real active power of the energy storage power station is shown,
Figure FDA00038891539100000318
representing the maximum possible active power of the wind power plant,
Figure FDA00038891539100000319
representing the minimum possible active power of the wind power plant.
7. The method of claim 5 or 6, further comprising:
and when the SOC of the energy storage power station reaches the preset distance of the currently set SOC upper limit or SOC lower limit, performing interpolation processing on the maximum dischargeable power or the maximum charging power of the energy storage power station.
8. A coordinated control apparatus for primary frequency modulation and AGC, the apparatus comprising:
the primary frequency modulation starting judgment module is used for judging whether primary frequency modulation control is entered;
the first energy storage parameter setting module is used for setting the upper and lower SOC (system on chip) limits of the energy storage power station in operation as a first limit and a second limit respectively if primary frequency modulation control is not performed, and reserving preset proportional capacity to not participate in output;
the first instruction distribution module is used for acquiring an AGC instruction and distributing the AGC instruction to the wind power station, the optical power station and the energy storage power station for execution;
the second energy storage parameter setting module is used for setting the upper and lower SOC (system on chip) limits of the energy storage power station in operation as a third limit and a fourth limit respectively and releasing all capacity to participate in output if primary frequency modulation control is performed;
the second instruction distribution module is used for calculating a primary frequency modulation instruction increment, and distributing the primary frequency modulation instruction increment and the obtained AGC instruction to the wind power station, the optical power station and the energy storage power station for execution after the primary frequency modulation instruction increment is superposed with the AGC instruction;
wherein the third limit is higher than the first limit and the fourth limit is lower than the second limit.
9. An electronic device, comprising:
a memory and a processor communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of any of claims 1-7.
10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to thereby perform the method of any one of claims 1-7.
CN202211253922.4A 2022-10-13 2022-10-13 Primary frequency modulation and AGC coordination control method and device and electronic equipment Pending CN115549128A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116338365A (en) * 2023-05-26 2023-06-27 南方电网数字电网研究院有限公司 Grid-connected performance testing method suitable for direct current offshore wind turbine generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116338365A (en) * 2023-05-26 2023-06-27 南方电网数字电网研究院有限公司 Grid-connected performance testing method suitable for direct current offshore wind turbine generator
CN116338365B (en) * 2023-05-26 2023-09-01 南方电网数字电网研究院有限公司 Grid-connected performance testing method suitable for direct current offshore wind turbine generator

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