CN114977251A - Control method for stabilizing wind power fluctuation of energy storage system - Google Patents

Control method for stabilizing wind power fluctuation of energy storage system Download PDF

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CN114977251A
CN114977251A CN202210895258.7A CN202210895258A CN114977251A CN 114977251 A CN114977251 A CN 114977251A CN 202210895258 A CN202210895258 A CN 202210895258A CN 114977251 A CN114977251 A CN 114977251A
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power
energy storage
storage system
time
charging
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CN114977251B (en
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罗隆福
杨京渝
欧阳志国
马芳
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Hunan Huada Electrician Hi Tech Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a control method for stabilizing wind power fluctuation of an energy storage system, which comprises the following steps: determining a charging interval and a discharging interval of a wind power plant energy storage system in a scheduling cycle according to a time sequence relation between wind power characteristics and load requirements of a wind power plant research area; in the charging interval, charging or not acting the energy storage system with the aim of stabilizing the upward fluctuation of the wind power; in the discharging area, discharging or not acting the energy storage system with the aim of stabilizing the downward fluctuation of the wind power; and adjusting the charging power or the discharging power of the energy storage system in real time by combining the capacity constraint and the charging and discharging power constraint of the energy storage system. The wind power absorption capacity in the valley period can be improved, the charging and discharging times of the energy storage system can be effectively reduced, the economic life of the energy storage system is prolonged, the energy space-time translation capacity is realized, the wind power absorption in the valley period can be promoted, the wind power abandoning capacity can be reduced, and the market competitiveness of the wind storage system is effectively improved.

Description

Control method for stabilizing wind power fluctuation of energy storage system
Technical Field
The invention relates to the technical field of wind-storage combined power generation system control, in particular to a control method for stabilizing wind power fluctuation of an energy storage system considering wind power consumption in a valley period.
Background
Currently, wind power generation is one of important components for accelerating the construction of a clean, low-carbon, safe and efficient energy system and continuously promoting the development strategy of carbon emission reduction, and the fluctuation and randomness of wind power bring huge impact and influence on the safe and stable operation of a power grid. In order to ensure the safe and stable operation of the whole power system and promote the development of new energy and traditional energy, the state sets up the corresponding technical standard and industry standard of wind power generation operation management. Corresponding stipulations and evaluation standards are made on the aspects of wind power prediction error, power fluctuation and the like. The energy storage system is matched with wind power to operate, so that the method is an effective means for improving the influence of wind power generation characteristics on grid connection and promotes grid connection consumption of large-scale wind power.
The energy storage system only participates in the control of stabilizing the wind power fluctuation to be a single scene, the charging and discharging times of the energy storage system are increased, the service life of a battery is shortened, and meanwhile, the problem of wind power consumption in the load valley period cannot be effectively solved. The control effect or the battery life is only considered as a single optimization target, and a good balance between the tracking effect and the energy storage service life is difficult to find, so that the overall economy and competitiveness of the wind storage system are influenced. Wind power has obvious anti-peak-shaving characteristic to stabilize wind power fluctuation as the control strategy of single target, can not effectively improve load trough time period wind-powered electricity generation and consume and reduce and abandon wind electric quantity scheduling problem, wind-powered electricity generation field energy storage operation main part benefit is not obvious.
Disclosure of Invention
In order to solve the technical problem that a wind storage combined power generation system can track a wind power curve while improving wind power consumption in a valley period, the invention provides an energy storage system stabilizing wind power fluctuation control method considering the wind power consumption in the valley period.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a control method for stabilizing wind power fluctuation of an energy storage system comprises the following steps:
determining a charging interval and a discharging interval of a wind power plant energy storage system in a scheduling cycle according to a time sequence relation between wind power characteristics and load requirements of a wind power plant research area;
in the charging interval, charging or not acting the energy storage system with the aim of stabilizing the upward fluctuation of the wind power;
and in the discharging area, discharging or not acting the energy storage system by taking the stabilization of the downward fluctuation of the wind power as a target.
And further adjusting the charging power or the discharging power of the energy storage system in real time by combining the capacity constraint and the charging and discharging power constraint of the energy storage system.
During the discharge interval, the real-time charge state of the energy storage system is adjusted
Figure 649734DEST_PATH_IMAGE001
And lower limit of state of charge
Figure 63702DEST_PATH_IMAGE002
Make a comparison if
Figure 141379DEST_PATH_IMAGE003
Adjusting the energy storage system to discharge the lower limit of power
Figure 377189DEST_PATH_IMAGE004
As the current time
Figure 856712DEST_PATH_IMAGE005
To the end of time
Figure 90247DEST_PATH_IMAGE006
Discharging with the discharge power of (1); wherein the content of the first and second substances,
Figure 779854DEST_PATH_IMAGE006
indicating the end time of the discharge interval section,
Figure 694721DEST_PATH_IMAGE005
as the current time of day, the time of day,
Figure 825488DEST_PATH_IMAGE007
the rated capacity of the energy storage system;
during the charging interval, the real-time charge state of the energy storage system is adjusted
Figure 557820DEST_PATH_IMAGE001
And upper limit of state of charge
Figure 344511DEST_PATH_IMAGE008
Make a comparison if
Figure 125385DEST_PATH_IMAGE009
Adjusting the energy storage system to charge the upper limit of the power
Figure 438554DEST_PATH_IMAGE010
As the current time
Figure 951575DEST_PATH_IMAGE005
To the end of time
Figure 287879DEST_PATH_IMAGE011
Charging with the charging power; wherein, the first and the second end of the pipe are connected with each other,
Figure 934761DEST_PATH_IMAGE011
indicating the end time of the charging interval.
Preferably, if there is a power limit instruction for the wind farm to transmit power to the power grid, the charging power of the energy storage system is:
Figure 977803DEST_PATH_IMAGE012
（1）
in the formula (I), the compound is shown in the specification,
Figure 51938DEST_PATH_IMAGE013
for wind farms in
Figure 875538DEST_PATH_IMAGE005
The actual wind power at the moment is,
Figure 935898DEST_PATH_IMAGE014
for energy storage systems in
Figure 958080DEST_PATH_IMAGE005
The charging power at the moment of time is,
Figure 140800DEST_PATH_IMAGE015
for automatic power generation control
Figure 123800DEST_PATH_IMAGE005
The power limiting power corresponding to the time power limiting instruction;
if the wind power plant does not have a power limiting instruction for transmitting power to the power grid, the energy storage system performs charging or does not operate by taking the upward fluctuation of the stabilized wind power as a target, specifically:
first, the energy storage system is calculated
Figure 112484DEST_PATH_IMAGE005
Time-stationary 1 control time interval
Figure 192436DEST_PATH_IMAGE016
Charging power required by upward fluctuation of wind power in battery
Figure 483740DEST_PATH_IMAGE017
：
Figure 78669DEST_PATH_IMAGE018
（2）
Figure 543149DEST_PATH_IMAGE019
（3）
Figure 680869DEST_PATH_IMAGE020
（4）
In the formula (I), the compound is shown in the specification,
Figure 2129DEST_PATH_IMAGE021
and
Figure 22037DEST_PATH_IMAGE022
respectively at the wind farm
Figure 227891DEST_PATH_IMAGE023
Time of day and
Figure 79172DEST_PATH_IMAGE005
wind and storage combined output at any moment;
Figure 774596DEST_PATH_IMAGE024
represent
Figure 485063DEST_PATH_IMAGE005
The actual wind power at the moment and
Figure 88082DEST_PATH_IMAGE023
difference of wind storage combined output at each moment;
Figure 997132DEST_PATH_IMAGE025
representing the maximum limit for allowing power fluctuation within 1 control interval,
Figure 535561DEST_PATH_IMAGE026
stabilizing the charging power of the wind power fluctuating upwards for the energy storage system within 1 control time interval;
then, calculating the energy storage system at
Figure 857958DEST_PATH_IMAGE005
Time of day settling
Figure 202352DEST_PATH_IMAGE027
Charging power required by wind power fluctuation in each control time interval
Figure 169171DEST_PATH_IMAGE028
：
Figure 268714DEST_PATH_IMAGE029
（5）
Figure 484932DEST_PATH_IMAGE030
（6）
Figure 570699DEST_PATH_IMAGE031
（7）
In the formula (I), the compound is shown in the specification,
Figure 516658DEST_PATH_IMAGE032
to represent
Figure 724786DEST_PATH_IMAGE005
Before the moment of time
Figure 631562DEST_PATH_IMAGE027
The minimum value of wind-storage combined output in each control time interval;
Figure 380075DEST_PATH_IMAGE033
represent
Figure 321486DEST_PATH_IMAGE005
Before the moment of time
Figure 700515DEST_PATH_IMAGE027
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 953642DEST_PATH_IMAGE034
indicating permission
Figure 646791DEST_PATH_IMAGE027
A maximum limit for the power fluctuation in the control time interval;
finally, selecting
Figure 973868DEST_PATH_IMAGE017
And
Figure 586115DEST_PATH_IMAGE028
the larger value of the sum is taken as the energy storage system is at present
Figure 467483DEST_PATH_IMAGE005
Charging power at a time
Figure 761061DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 270540DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates upwards:
Figure 929054DEST_PATH_IMAGE035
（8）。
preferably, in the discharging section, the energy storage system discharges or does not act with the goal of stabilizing the downward fluctuation of the wind power, specifically:
first, the energy storage system is calculated
Figure 94456DEST_PATH_IMAGE005
Discharge power required by downward fluctuation of wind power within 1 control time interval is stabilized constantly
Figure 988463DEST_PATH_IMAGE036
：
Figure 555710DEST_PATH_IMAGE037
（9）
Then, calculating the energy storage system at
Figure 385126DEST_PATH_IMAGE005
Time of day settling
Figure 100141DEST_PATH_IMAGE027
Wind power in one control time intervalDischarge power with downward fluctuation of power
Figure 938784DEST_PATH_IMAGE028
：
Figure 94959DEST_PATH_IMAGE038
（10）
Figure 219910DEST_PATH_IMAGE039
（11）
Figure 297587DEST_PATH_IMAGE040
（12）
In the formula (I), the compound is shown in the specification,
Figure 736659DEST_PATH_IMAGE041
represent
Figure 75236DEST_PATH_IMAGE005
Before the moment of time
Figure 512034DEST_PATH_IMAGE027
The maximum value of wind-storage combined output in each control time interval;
Figure 873745DEST_PATH_IMAGE042
to represent
Figure 913245DEST_PATH_IMAGE005
Before the moment of time
Figure 247275DEST_PATH_IMAGE027
The power of the maximum value of the power fluctuation in the control time interval is downward;
finally, selecting
Figure 651711DEST_PATH_IMAGE026
And
Figure 563036DEST_PATH_IMAGE043
is currently used as the energy storage system
Figure 281593DEST_PATH_IMAGE005
Discharge power at a time
Figure 532446DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 170100DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates downwards:
Figure 506404DEST_PATH_IMAGE044
（13）。
preferably, each control time interval is 1 minute, and n is 10.
Preferably, the real-time state of charge of the energy storage system
Figure 28652DEST_PATH_IMAGE001
The calculation formula of (2) is as follows:
Figure 196328DEST_PATH_IMAGE045
（14）
in the formula (I), the compound is shown in the specification,
Figure 942567DEST_PATH_IMAGE046
in order to provide the charging efficiency of the energy storage system,
Figure 703850DEST_PATH_IMAGE047
in order to achieve the discharge efficiency of the energy storage system,
Figure 888844DEST_PATH_IMAGE048
time is indicative of the charging power,
Figure 848709DEST_PATH_IMAGE049
time represents the discharge power; and at any timeCarving tool
Figure 969112DEST_PATH_IMAGE005
The state of charge and the charge-discharge power satisfy the following inequality constraints:
Figure 342325DEST_PATH_IMAGE050
（15）
Figure 3113DEST_PATH_IMAGE051
（16）
Figure 20748DEST_PATH_IMAGE052
（17）
wherein, the formula (15) is the charge state constraint, the formula (16) is the charge power constraint, the formula (17) is the discharge power constraint,
Figure 436685DEST_PATH_IMAGE016
in order to control the time interval,
Figure 969298DEST_PATH_IMAGE010
represents the upper charging power limit of the energy storage system,
Figure 637040DEST_PATH_IMAGE004
the lower limit of the energy storage discharge power.
As a preference, the first and second liquid crystal compositions are,
Figure 368235DEST_PATH_IMAGE053
，
Figure 892758DEST_PATH_IMAGE054
。
advantageous effects
An important reason for restricting wind power consumption is the inverse peak regulation characteristic of wind power, and the essence of the method is that the bottleneck of downward peak regulation of a power grid appears in a load valley period, and the power grid has sufficient negative spare capacity to absorb wind power in a load peak period. The energy storage system is adopted to transfer part of negative reserve capacity of the power grid in the peak load period to the valley period, so that the problem of wind abandon caused by the fact that the peak regulation bottleneck of the power grid is loosened by the current situation that the negative reserve capacity of the system is insufficient can be improved. The energy storage system is divided into fixed charging and discharging time periods, charging is carried out in the load valley period, discharging is carried out in the peak period, wind power consumption in the valley period is promoted, and abandoned wind is reduced. Meanwhile, the electric quantity is stored by taking the stabilization of the upward fluctuation of the wind power as a target in a charging interval, and the electric quantity is released by taking the stabilization of the downward fluctuation of the wind power as a target in a discharging interval, so that the fluctuation of the wind power is stabilized.
Therefore, under the condition of stabilizing certain wind power, the invention reduces the charging and discharging times of the energy storage system and the charging and discharging depth of the battery electric energy, and improves the service life of energy storage. Simultaneously, the power of the shifting valley period is better, and the power of the abandoned wind is reduced. The relationship between the control effect and the energy storage life can be better coordinated, so that the competitiveness of the wind energy storage system is further improved.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present application;
FIG. 2 is a wind-storage combined force output curve according to an embodiment of the present application;
FIG. 3 is an energy storage system output power curve according to an embodiment of the present application;
fig. 4 is an SOC curve of the energy storage system according to the embodiment of the present application.
Detailed Description
The method for stabilizing wind power fluctuation of an energy storage system considering wind power consumption in a valley period according to the present invention is described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, a control method for stabilizing wind power fluctuation by an energy storage system considering wind power consumption in a valley period of the invention includes:
(1) according to the time sequence relation between the wind power characteristics and the load requirements of the wind power plant research area, the charging section and the discharging section of the wind power plant energy storage system in one scheduling period are determined.
(2) In the charging interval, the energy storage system is charged or does not act with the aim of stabilizing the upward fluctuation of the wind power.
If the wind power plant transmits power to the power grid and has a power limiting instruction, the charging power of the energy storage system is as follows:
Figure 115928DEST_PATH_IMAGE012
（1）
in the formula (I), the compound is shown in the specification,
Figure 180836DEST_PATH_IMAGE013
for wind farms at
Figure 969801DEST_PATH_IMAGE005
The actual wind power at the moment is,
Figure 868487DEST_PATH_IMAGE014
for energy storage systems in
Figure 172429DEST_PATH_IMAGE005
The charging power at the moment of time is,
Figure 978711DEST_PATH_IMAGE015
is controlled for automatic power generation at
Figure 91024DEST_PATH_IMAGE005
And the power limiting power corresponding to the time power limiting command.
If the wind power plant does not have a power limiting instruction for transmitting power to the power grid, the energy storage system performs charging or does not operate by taking the upward fluctuation of the stabilized wind power as a target, specifically:
first, the energy storage system is calculated
Figure 754086DEST_PATH_IMAGE005
Time-stationary 1 control time interval
Figure 951849DEST_PATH_IMAGE016
Charging power required by upward fluctuation of wind power in battery
Figure 624139DEST_PATH_IMAGE017
：
Figure 387696DEST_PATH_IMAGE018
（2）
Figure 362605DEST_PATH_IMAGE019
（3）
Figure 906719DEST_PATH_IMAGE020
（4）
In the formula (I), the compound is shown in the specification,
Figure 54803DEST_PATH_IMAGE021
and
Figure 876129DEST_PATH_IMAGE022
respectively at the wind farm
Figure 146573DEST_PATH_IMAGE023
Time of day and
Figure 850087DEST_PATH_IMAGE005
wind and storage combined output at any moment;
Figure 739546DEST_PATH_IMAGE024
to represent
Figure 540011DEST_PATH_IMAGE005
The actual wind power at the moment and
Figure 653461DEST_PATH_IMAGE023
difference of wind storage combined output at each moment;
Figure 47533DEST_PATH_IMAGE025
representing the maximum limit for allowing power fluctuation within 1 control interval,
Figure 599737DEST_PATH_IMAGE026
stabilizing the charging power of the energy storage system, which fluctuates upwards in wind power within 1 control time interval; wherein
Figure 192393DEST_PATH_IMAGE055
Indicating that the energy storage system is not active.
Then, calculating the energy storage system at
Figure 945585DEST_PATH_IMAGE005
Time of day settling
Figure 686008DEST_PATH_IMAGE027
Charging power required by wind power fluctuation in each control time interval
Figure 917269DEST_PATH_IMAGE028
：
Figure 364431DEST_PATH_IMAGE056
（5）
Figure 147579DEST_PATH_IMAGE030
（6）
Figure 312981DEST_PATH_IMAGE057
（7）
In the formula (I), the compound is shown in the specification,
Figure 347933DEST_PATH_IMAGE032
to represent
Figure 711919DEST_PATH_IMAGE005
Before the moment of time
Figure 603651DEST_PATH_IMAGE027
The minimum value of wind-storage combined output in each control time interval;
Figure 459612DEST_PATH_IMAGE033
to represent
Figure 891730DEST_PATH_IMAGE005
Before the moment of time
Figure 516746DEST_PATH_IMAGE027
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 579380DEST_PATH_IMAGE034
indicating permission
Figure 516112DEST_PATH_IMAGE027
A maximum limit for upward power fluctuation within each control time interval;
finally, selecting
Figure 955184DEST_PATH_IMAGE017
And
Figure 434707DEST_PATH_IMAGE028
the larger value of the sum is taken as the energy storage system is at present
Figure 730559DEST_PATH_IMAGE005
Charging power at a time
Figure 295533DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 7137DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates upwards:
Figure 465800DEST_PATH_IMAGE035
（8）
(3) and in the discharging area, discharging or not acting the energy storage system by taking the stabilization of the downward fluctuation of the wind power as a target.
First, the energy storage system is calculated
Figure 73499DEST_PATH_IMAGE005
Discharge power required by downward fluctuation of wind power within 1 control time interval constantly
Figure 922506DEST_PATH_IMAGE036
：
Figure 500118DEST_PATH_IMAGE020
（9）
Then, calculating the energy storage system at
Figure 750971DEST_PATH_IMAGE005
Time of day settling
Figure 529571DEST_PATH_IMAGE027
Discharging power required by downward fluctuation of wind power in each control time interval
Figure 928191DEST_PATH_IMAGE028
：
Figure 247177DEST_PATH_IMAGE058
（10）
Figure 555798DEST_PATH_IMAGE030
（11）
Figure 364354DEST_PATH_IMAGE059
（12）
In the formula (I), the compound is shown in the specification,
Figure 922375DEST_PATH_IMAGE041
to represent
Figure 248314DEST_PATH_IMAGE005
Before the moment of timenThe maximum value of wind-storage combined output in each control time interval;
Figure 270497DEST_PATH_IMAGE042
represent
Figure 187637DEST_PATH_IMAGE005
Before the moment of time
Figure 701795DEST_PATH_IMAGE027
The power of the maximum value of the power fluctuation in the control time interval is downward;
finally, selecting
Figure 424900DEST_PATH_IMAGE026
And
Figure 442535DEST_PATH_IMAGE043
is currently used as the energy storage system
Figure 796156DEST_PATH_IMAGE005
Discharge power at a time
Figure 391085DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 589985DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates downwards:
Figure 727706DEST_PATH_IMAGE044
（13）。
in a preferred embodiment, each control time interval is 1 minute,
Figure 314545DEST_PATH_IMAGE027
the value is 10.
(4) In order to improve the wind power consumption capacity in the valley period, the capacity constraint and the charge and discharge power constraint of the energy storage system are combined, and the charge power or the discharge power of the energy storage system is further adjusted in real time.
In the discharging interval, in order to ensure that the energy storage system has enough wind power consumption capacity in the charging interval, the SOC of the energy storage system is reduced to a lower limit value at the end of the discharging interval. When the method is implemented, the real-time charge state of the energy storage system is adjusted
Figure 68874DEST_PATH_IMAGE001
And lower limit of state of charge
Figure 540307DEST_PATH_IMAGE002
Comparing, if the following expression is satisfied, adjusting the energy storage system to discharge the lower limit of power
Figure 391588DEST_PATH_IMAGE004
As the current time
Figure 821432DEST_PATH_IMAGE005
To the end of time
Figure 531900DEST_PATH_IMAGE006
The discharge power is discharged, so that the electric quantity of the energy storage system reaches the minimum value at the end moment of a discharge interval;
Figure 400498DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 43969DEST_PATH_IMAGE006
indicating the end time of the discharge interval section,
Figure 113557DEST_PATH_IMAGE005
as the current time of day, the time of day,
Figure 904795DEST_PATH_IMAGE007
the rated capacity of the energy storage system;
during the charging interval, the real-time charge state of the energy storage system is adjusted
Figure 718030DEST_PATH_IMAGE001
And upper limit of state of charge
Figure 481587DEST_PATH_IMAGE008
Comparing, if the following expression is satisfied, adjusting the energy storage system to charge the upper limit of the power
Figure 315551DEST_PATH_IMAGE010
As the current time
Figure 610DEST_PATH_IMAGE005
To the end of time
Figure 148695DEST_PATH_IMAGE011
The charging power of (a) is charged.
Figure 829075DEST_PATH_IMAGE009
Wherein the content of the first and second substances,
Figure 771623DEST_PATH_IMAGE011
indicating the end time of the charging interval.
Real-time state of charge of the above energy storage system
Figure 678399DEST_PATH_IMAGE001
The calculation formula is as follows:
Figure 692491DEST_PATH_IMAGE060
（14）
in the formula (I), the compound is shown in the specification,
Figure 165061DEST_PATH_IMAGE046
in order to provide the charging efficiency of the energy storage system,
Figure 747352DEST_PATH_IMAGE047
in order to achieve the discharge efficiency of the energy storage system,
Figure 479DEST_PATH_IMAGE048
when it is time, it means charging,
Figure 693628DEST_PATH_IMAGE049
indicating a discharge. Considering the factors of the service life and the safety of the storage battery and the like at any time
Figure 286284DEST_PATH_IMAGE005
The state of charge and the charge-discharge power satisfy the following inequality constraints:
Figure 898531DEST_PATH_IMAGE050
（15）
Figure 514320DEST_PATH_IMAGE051
（16）
Figure 807898DEST_PATH_IMAGE052
（17）
wherein, the formula (15) is the charge state constraint, the formula (16) is the charge power constraint, the formula (17) is the discharge power constraint,
Figure 317377DEST_PATH_IMAGE016
in order to control the time interval,
Figure 241470DEST_PATH_IMAGE010
represents the upper charging power limit of the energy storage system,
Figure 406872DEST_PATH_IMAGE004
the lower limit of the energy storage discharge power.
Specific examples are given below:
for the embodiment, a wind farm with 50MW in a certain area is adopted to configure a 10MW/20MW · h electrochemical energy storage system as a test system, the sampling time is 1min, the scheduling period is 24 hours, the charge-discharge efficiency of the energy storage system is 0.9, the upper limit of SOC is 0.9, and the lower limit of SOC is 0.1.
In order to verify the superiority of the control method provided by the invention, a control strategy that the energy storage system only participates in a single scene of stabilizing wind power fluctuation is set as a comparison scheme, and for convenience of description, the control strategy is referred to as scheme 1 for short. The process proposed by the present invention is referred to as scheme 2.
As can be seen from fig. 2, 3 and 4, in the scheme 1, although the wind power fluctuation can be controlled within a limited range, the charging and discharging times are greatly increased, the service life of the battery is seriously influenced, and the electric quantity effect in the shifting valley period is the worst, and the capability of reducing the abandoned wind electric quantity is not provided. Scheme 2 has reduced energy storage system's charge-discharge number of times and the charge-discharge degree of depth of battery electric energy under the circumstances of stabilizing certain wind-powered electricity generation power, improves energy storage life. Simultaneously, the power of the shifting valley period is better, and the power of the abandoned wind is reduced. Compared with the scheme 1, the scheme 2 can better coordinate the relationship between the control effect and the energy storage life, thereby further improving the competitiveness of the wind energy storage system.
The above embodiments are preferred embodiments of the present application, and those skilled in the art can make various changes or modifications without departing from the general concept of the present application, and such changes or modifications should fall within the scope of the claims of the present application.

Claims (6)

1. A control method for stabilizing wind power fluctuation of an energy storage system is characterized by comprising the following steps:
determining a charging interval and a discharging interval of a wind power plant energy storage system in a scheduling cycle according to a time sequence relation between wind power characteristics and load requirements of a wind power plant research area;
in the charging interval, charging or not acting the energy storage system with the aim of stabilizing the upward fluctuation of the wind power;
in the discharging area, discharging or not acting the energy storage system with the aim of stabilizing the downward fluctuation of the wind power;
the charging power or the discharging power of the energy storage system is further adjusted in real time by combining the capacity constraint and the charging and discharging power constraint of the energy storage system;
during the discharge period, the real-time charge state of the energy storage system is adjusted
Figure 882791DEST_PATH_IMAGE001
And lower limit of state of charge
Figure 954652DEST_PATH_IMAGE002
Make a comparison if
Figure 66964DEST_PATH_IMAGE003
Adjusting the energy storage system to discharge the lower power limit
Figure 198868DEST_PATH_IMAGE004
As the current time
Figure 458948DEST_PATH_IMAGE005
To the end of time
Figure 537763DEST_PATH_IMAGE006
Discharging with the discharge power of (1); wherein the content of the first and second substances,
Figure 832478DEST_PATH_IMAGE006
indicating the end time of the discharge period section,
Figure 869704DEST_PATH_IMAGE005
as the current time of day, the time of day,
Figure 820343DEST_PATH_IMAGE007
is the rated capacity of the energy storage system;
during the charging interval, the real-time charge state of the energy storage system is adjusted
Figure 234006DEST_PATH_IMAGE001
And upper limit of state of charge
Figure 383228DEST_PATH_IMAGE008
Make a comparison if
Figure 591355DEST_PATH_IMAGE009
Adjusting the energy storage system to charge the upper limit of the power
Figure 763711DEST_PATH_IMAGE010
As the current time
Figure 246645DEST_PATH_IMAGE005
To the end of time
Figure 984794DEST_PATH_IMAGE011
Charging with the charging power; wherein the content of the first and second substances,
Figure 832664DEST_PATH_IMAGE011
indicating the end time of the charging interval.
2. The method according to claim 1, wherein in the charging interval, if there is a power limit command for the wind farm to transmit power to the grid, the charging power of the energy storage system is:
Figure 554632DEST_PATH_IMAGE012
（1）
in the formula (I), the compound is shown in the specification,
Figure 310099DEST_PATH_IMAGE013
for wind farms in
Figure 371596DEST_PATH_IMAGE005
The actual wind power at the moment is,
Figure 452684DEST_PATH_IMAGE014
for energy storage systems in
Figure 130790DEST_PATH_IMAGE005
The charging power at the moment of time is,
Figure 893210DEST_PATH_IMAGE015
for automatic power generation control
Figure 871530DEST_PATH_IMAGE005
The power limiting power corresponding to the moment power limiting instruction;
if the wind power plant does not have a power limiting instruction for transmitting power to the power grid, the energy storage system performs charging or does not operate by taking the upward fluctuation of the stabilized wind power as a target, specifically:
first, the energy storage system is calculated
Figure 857941DEST_PATH_IMAGE005
Time-stationary 1 control time interval
Figure 492184DEST_PATH_IMAGE016
Charging power required by upward fluctuation of wind power in battery
Figure 855032DEST_PATH_IMAGE017
：
Figure 422280DEST_PATH_IMAGE018
（2）
Figure 782854DEST_PATH_IMAGE019
（3）
Figure 701132DEST_PATH_IMAGE020
（4）
In the formula (I), the compound is shown in the specification,
Figure 602092DEST_PATH_IMAGE021
and
Figure 492687DEST_PATH_IMAGE022
respectively at the wind farm
Figure 86480DEST_PATH_IMAGE023
Time of day and
Figure 226474DEST_PATH_IMAGE005
wind and storage combined output at any moment;
Figure 868808DEST_PATH_IMAGE024
to represent
Figure 676227DEST_PATH_IMAGE005
Actual wind power at any moment and
Figure 175341DEST_PATH_IMAGE023
difference of wind storage combined output at each moment;
Figure 5894DEST_PATH_IMAGE025
representing the maximum limit for allowing power fluctuation within 1 control interval,
Figure 248657DEST_PATH_IMAGE026
stabilizing the charging power of the energy storage system, which fluctuates upwards in wind power within 1 control time interval;
then, calculating the energy storage system at
Figure 176161DEST_PATH_IMAGE005
Time of day settling
Figure 49439DEST_PATH_IMAGE027
Charging power required by wind power fluctuation in each control time interval
Figure 164026DEST_PATH_IMAGE028
：
Figure 210479DEST_PATH_IMAGE029
（5）
Figure 930174DEST_PATH_IMAGE030
（6）
Figure 771091DEST_PATH_IMAGE031
（7）
In the formula (I), the compound is shown in the specification,
Figure 372973DEST_PATH_IMAGE032
to represent
Figure 160801DEST_PATH_IMAGE005
Before the moment of time
Figure 797318DEST_PATH_IMAGE027
The minimum value of wind-storage combined output in each control time interval;
Figure 809137DEST_PATH_IMAGE033
represent
Figure 101578DEST_PATH_IMAGE005
Before the moment of time
Figure 224255DEST_PATH_IMAGE027
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 980858DEST_PATH_IMAGE034
indicating permission
Figure 366840DEST_PATH_IMAGE027
A maximum limit for upward power fluctuation within each control time interval;
finally, selecting
Figure 677736DEST_PATH_IMAGE017
And
Figure 869683DEST_PATH_IMAGE028
the larger value of the sum is taken as the energy storage system is at present
Figure 418476DEST_PATH_IMAGE005
Charging power at a time
Figure 772097DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 835867DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates upwards:
Figure 769188DEST_PATH_IMAGE035
（8）。
3. method according to claim 2, characterized in that during the discharge interval the energy storage system is discharged or not activated with the aim of smoothing the wind power fluctuation downwards, in particular:
first, the energy storage system is calculated
Figure 969226DEST_PATH_IMAGE005
Discharge power required by downward fluctuation of wind power within 1 control time interval is stabilized constantly
Figure 759327DEST_PATH_IMAGE036
：
Figure 248077DEST_PATH_IMAGE037
（9）
Then, calculating the energy storage system at
Figure 781827DEST_PATH_IMAGE005
Time of day settling
Figure 101950DEST_PATH_IMAGE027
Discharging power required by downward fluctuation of wind power in each control time interval
Figure 636DEST_PATH_IMAGE028
：
Figure 773419DEST_PATH_IMAGE038
（10）
Figure 110860DEST_PATH_IMAGE039
（11）
Figure 19910DEST_PATH_IMAGE040
（12）
In the formula (I), the compound is shown in the specification,
Figure 355076DEST_PATH_IMAGE041
to represent
Figure 615156DEST_PATH_IMAGE005
Before the moment of time
Figure 490709DEST_PATH_IMAGE027
The maximum value of wind-storage combined output in each control time interval;
Figure 457528DEST_PATH_IMAGE042
to represent
Figure 25912DEST_PATH_IMAGE005
Before the moment of time
Figure 507709DEST_PATH_IMAGE027
The power of the maximum value of the power fluctuation in the control time interval is downward;
finally, selecting
Figure 124635DEST_PATH_IMAGE026
And
Figure 8278DEST_PATH_IMAGE043
is currently used as the energy storage system
Figure 747563DEST_PATH_IMAGE005
Discharge power at a time
Figure 919919DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 137274DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates downwards:
Figure 141002DEST_PATH_IMAGE044
（13）。
4. a method according to claim 2 or 3, characterized in that each control time interval
Figure 988872DEST_PATH_IMAGE016
The time is 1 minute and the time is less,
Figure 445261DEST_PATH_IMAGE027
the value is 10.
5. The method of claim 1, wherein the real-time state of charge of the energy storage system
Figure 466307DEST_PATH_IMAGE001
The calculation formula of (2) is as follows:
Figure 527804DEST_PATH_IMAGE045
（14）
in the formula (I), the compound is shown in the specification,
Figure 77734DEST_PATH_IMAGE046
time is indicative of the charging power,
Figure 286998DEST_PATH_IMAGE047
time represents the discharge power; and at any time
Figure 49418DEST_PATH_IMAGE005
The state of charge and the charge-discharge power satisfy the following inequality constraints:
Figure 762159DEST_PATH_IMAGE048
（15）
Figure 14149DEST_PATH_IMAGE049
（16）
Figure 382813DEST_PATH_IMAGE050
（17）
wherein, the formula (15) is the charge state constraint, the formula (16) is the charge power constraint, the formula (17) is the discharge power constraint,
Figure 745661DEST_PATH_IMAGE016
in order to control the time interval,
Figure 578488DEST_PATH_IMAGE051
represents the upper charging power limit of the energy storage system,
Figure 939062DEST_PATH_IMAGE004
the lower limit of the energy storage discharge power.
6. The method of claim 1,
Figure 591760DEST_PATH_IMAGE052
，
Figure 758300DEST_PATH_IMAGE053
。
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