CN114977251B - 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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CN114977251B
CN114977251B CN202210895258.7A CN202210895258A CN114977251B CN 114977251 B CN114977251 B CN 114977251B CN 202210895258 A CN202210895258 A CN 202210895258A CN 114977251 B CN114977251 B CN 114977251B
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power
energy storage
storage system
time
charging
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CN114977251A (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

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
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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 method can improve the wind power consumption capacity in the valley period, effectively reduce the charging and discharging times of the energy storage system, improve the economic life of the energy storage system, simultaneously has the space-time translation capacity on energy, can promote the wind power consumption in the valley period and reduce the wind abandoning electric quantity, and effectively improves the market competitiveness of the wind storage system.

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 by an energy storage system considering wind power absorption 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 section 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 307141DEST_PATH_IMAGE001
And lower limit of state of charge
Figure 489860DEST_PATH_IMAGE002
Make a comparison if
Figure 410543DEST_PATH_IMAGE003
Adjusting the energy storage system to discharge the lower limit of power
Figure 71331DEST_PATH_IMAGE004
As the current time
Figure 151283DEST_PATH_IMAGE005
To the end of time
Figure 239324DEST_PATH_IMAGE006
Discharging with the discharge power of (1); wherein, the first and the second end of the pipe are connected with each other,
Figure 647303DEST_PATH_IMAGE006
indicating the end time of the discharge interval section,
Figure 111783DEST_PATH_IMAGE005
as the current time of day, the time of day,
Figure 780661DEST_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 39604DEST_PATH_IMAGE001
And upper limit of state of charge
Figure 59513DEST_PATH_IMAGE008
Make a comparison if
Figure 436005DEST_PATH_IMAGE009
Adjusting the energy storage system to charge the upper limit of the power
Figure 959391DEST_PATH_IMAGE010
As the current time
Figure 654814DEST_PATH_IMAGE005
To the end of time
Figure 162019DEST_PATH_IMAGE011
Charging with the charging power; wherein the content of the first and second substances,
Figure 702722DEST_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 487138DEST_PATH_IMAGE012
（1）
in the formula (I), the compound is shown in the specification,
Figure 822304DEST_PATH_IMAGE013
for wind farms in
Figure 816805DEST_PATH_IMAGE005
The actual wind power at the moment is,
Figure 161199DEST_PATH_IMAGE014
for energy storage systems in
Figure 924756DEST_PATH_IMAGE005
The charging power at the time of day is,
Figure 837348DEST_PATH_IMAGE015
for automatic power generation control
Figure 53566DEST_PATH_IMAGE005
Limit corresponding to time power-limiting instructionElectrical power;
if the wind power plant does not have a power limiting instruction for transmitting power to the power grid, the energy storage system charges or does not act with the aim of stabilizing the upward fluctuation of the wind power as a target, and specifically:
first, the energy storage system is calculated
Figure 936071DEST_PATH_IMAGE005
Time-stationary 1 control interval
Figure 554134DEST_PATH_IMAGE016
Charging power required by upward fluctuation of wind power in battery
Figure 762262DEST_PATH_IMAGE017
：
Figure 341142DEST_PATH_IMAGE018
（2）
Figure 27338DEST_PATH_IMAGE019
（3）
Figure 499907DEST_PATH_IMAGE020
（4）
In the formula (I), the compound is shown in the specification,
Figure 878936DEST_PATH_IMAGE021
and
Figure 69746DEST_PATH_IMAGE022
respectively at the wind farm
Figure 936464DEST_PATH_IMAGE023
Time of day and
Figure 263540DEST_PATH_IMAGE005
wind and storage combined output at any moment;
Figure 813470DEST_PATH_IMAGE024
to represent
Figure 225997DEST_PATH_IMAGE005
Actual wind power at any moment and
Figure 519575DEST_PATH_IMAGE023
difference of wind-storage combined output at each moment;
Figure 842103DEST_PATH_IMAGE025
representing a maximum limit for allowing power fluctuations for 1 control interval,
Figure 297356DEST_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
Figure 462758DEST_PATH_IMAGE005
Time of day settling
Figure 294447DEST_PATH_IMAGE027
Charging power required by upward fluctuation of wind power in control time interval
Figure 596116DEST_PATH_IMAGE028
：
Figure 97635DEST_PATH_IMAGE029
（5）
Figure 750334DEST_PATH_IMAGE030
（6）
Figure 385714DEST_PATH_IMAGE031
（7）
In the formula (I), the compound is shown in the specification,
Figure 541889DEST_PATH_IMAGE032
to represent
Figure 479889DEST_PATH_IMAGE005
Before the moment of time
Figure 354304DEST_PATH_IMAGE027
The minimum value of wind-storage combined output in each control time interval;
Figure 527797DEST_PATH_IMAGE033
to represent
Figure 804057DEST_PATH_IMAGE005
Before the moment of time
Figure 37593DEST_PATH_IMAGE027
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 773205DEST_PATH_IMAGE034
indicating permission
Figure 750388DEST_PATH_IMAGE027
A maximum limit for the power fluctuation in the control time interval;
finally, selecting
Figure 615576DEST_PATH_IMAGE017
And
Figure 20013DEST_PATH_IMAGE028
the larger value of the sum is taken as the energy storage system is at present
Figure 869020DEST_PATH_IMAGE005
Charging power at a moment
Figure 259681DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 510534DEST_PATH_IMAGE027
Within a control time intervalThe wind power fluctuates upwards:
Figure 85872DEST_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 156596DEST_PATH_IMAGE005
Discharge power required by downward fluctuation of wind power within 1 control time interval is stabilized constantly
Figure 475582DEST_PATH_IMAGE036
：
Figure 456307DEST_PATH_IMAGE037
（9）
Then, calculating the energy storage system at
Figure 202546DEST_PATH_IMAGE005
Time of day settling
Figure 760567DEST_PATH_IMAGE027
Discharging power required by downward fluctuation of wind power in each control time interval
Figure 617664DEST_PATH_IMAGE028
：
Figure 577530DEST_PATH_IMAGE038
（10）
Figure 370037DEST_PATH_IMAGE039
（11）
Figure 680932DEST_PATH_IMAGE040
（12）
In the formula (I), the compound is shown in the specification,
Figure 341721DEST_PATH_IMAGE041
to represent
Figure 890514DEST_PATH_IMAGE005
Before the moment of time
Figure 244135DEST_PATH_IMAGE027
The maximum value of wind-storage combined output in each control time interval;
Figure 165297DEST_PATH_IMAGE042
to represent
Figure 629776DEST_PATH_IMAGE005
Before the moment of time
Figure 298655DEST_PATH_IMAGE027
The power of the maximum value of the power downward fluctuation in each control time interval;
finally, selecting
Figure 823177DEST_PATH_IMAGE026
And
Figure 577507DEST_PATH_IMAGE043
is currently used as the energy storage system
Figure 455464DEST_PATH_IMAGE005
Discharge power at a time
Figure 244429DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 939852DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates downwards:
Figure 915898DEST_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 722180DEST_PATH_IMAGE001
The calculation formula of (2) is as follows:
Figure 506597DEST_PATH_IMAGE045
（14）
in the formula (I), the compound is shown in the specification,
Figure 107342DEST_PATH_IMAGE046
in order to provide the charging efficiency of the energy storage system,
Figure 101843DEST_PATH_IMAGE047
in order to achieve the discharge efficiency of the energy storage system,
Figure 180658DEST_PATH_IMAGE048
time is indicative of the charging power,
Figure 944214DEST_PATH_IMAGE049
time represents the discharge power; and at any time
Figure 591227DEST_PATH_IMAGE005
The state of charge and the charge-discharge power of the battery satisfy the following inequality constraints:
Figure 73024DEST_PATH_IMAGE050
（15）
Figure 221109DEST_PATH_IMAGE051
（16）
Figure 573593DEST_PATH_IMAGE052
（17）
wherein, the equation (15) is the charge state constraint, the equation (16) is the charge power constraint, the equation (17) is the discharge power constraint,
Figure 781720DEST_PATH_IMAGE016
in order to control the time interval(s),
Figure 859135DEST_PATH_IMAGE010
represents the upper charging power limit of the energy storage system,
Figure 545332DEST_PATH_IMAGE004
is the lower limit of the energy storage discharge power.
As a matter of preference,
Figure 17901DEST_PATH_IMAGE053
，
Figure 131351DEST_PATH_IMAGE054
。
advantageous effects
An important reason for restricting wind power consumption is the reverse 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 current situation of insufficient negative reserve of the system can be improved to relax the peak regulation bottleneck of the power grid and the problem of wind abandon caused by the peak regulation bottleneck of the power grid. 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 a graph of energy storage system output power 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 by an energy storage system considering wind power consumption during the valley period according to the present invention is described in detail below with reference to the embodiments and the 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 322161DEST_PATH_IMAGE012
（1）
in the formula (I), the compound is shown in the specification,
Figure 687414DEST_PATH_IMAGE013
for wind farms in
Figure 280070DEST_PATH_IMAGE005
The actual wind power at the moment is,
Figure 830000DEST_PATH_IMAGE014
for energy storage systems in
Figure 508106DEST_PATH_IMAGE005
The charging power at the moment of time is,
Figure 270525DEST_PATH_IMAGE015
for automatic power generation control
Figure 593053DEST_PATH_IMAGE005
And 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 313885DEST_PATH_IMAGE005
Time-stationary 1 control time interval
Figure 479287DEST_PATH_IMAGE016
Charging power required by upward fluctuation of wind power in battery
Figure 45397DEST_PATH_IMAGE017
：
Figure 347066DEST_PATH_IMAGE018
（2）
Figure 114164DEST_PATH_IMAGE019
（3）
Figure 766863DEST_PATH_IMAGE020
（4）
In the formula (I), the compound is shown in the specification,
Figure 136664DEST_PATH_IMAGE021
and
Figure 292839DEST_PATH_IMAGE022
respectively at the wind farm
Figure 355473DEST_PATH_IMAGE023
Time of day and
Figure 606719DEST_PATH_IMAGE005
wind and storage combined output at any moment;
Figure 45791DEST_PATH_IMAGE024
to represent
Figure 322051DEST_PATH_IMAGE005
The actual wind power at the moment and
Figure 555586DEST_PATH_IMAGE023
difference of wind storage combined output at each moment;
Figure 651718DEST_PATH_IMAGE025
representing the maximum limit for allowing power fluctuation within 1 control interval,
Figure 238689DEST_PATH_IMAGE026
stabilizing the charging power of the wind power fluctuating upwards for the energy storage system within 1 control time interval; wherein
Figure 635035DEST_PATH_IMAGE055
Indicating that the energy storage system is not active.
Then, calculating the energy storage system at
Figure 39472DEST_PATH_IMAGE005
Time of day stabilization
Figure 622900DEST_PATH_IMAGE027
Charging power required by upward fluctuation of wind power in control time interval
Figure 138195DEST_PATH_IMAGE028
：
Figure 264414DEST_PATH_IMAGE056
（5）
Figure 839751DEST_PATH_IMAGE030
（6）
Figure 176055DEST_PATH_IMAGE057
（7）
In the formula (I), the compound is shown in the specification,
Figure 495041DEST_PATH_IMAGE032
represent
Figure 475766DEST_PATH_IMAGE005
Before the moment of time
Figure 222005DEST_PATH_IMAGE027
The minimum value of wind-storage combined output in each control time interval;
Figure 780026DEST_PATH_IMAGE033
to represent
Figure 637123DEST_PATH_IMAGE005
Before the moment of time
Figure 596989DEST_PATH_IMAGE027
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 888031DEST_PATH_IMAGE034
indicating permission
Figure 198926DEST_PATH_IMAGE027
A maximum limit for the power fluctuation in the control time interval;
finally, the process is carried out in a closed loop,selecting
Figure 859715DEST_PATH_IMAGE017
And
Figure 408508DEST_PATH_IMAGE028
as the energy storage system is currently in use
Figure 762129DEST_PATH_IMAGE005
Charging power at a time
Figure 170107DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 369008DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates upwards:
Figure 303466DEST_PATH_IMAGE035
（8）
(3) And in the discharging interval, 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 827988DEST_PATH_IMAGE005
Discharge power required by downward fluctuation of wind power within 1 control time interval constantly
Figure 457683DEST_PATH_IMAGE036
：
Figure 725854DEST_PATH_IMAGE058
（9）
Then, calculating the energy storage system
Figure 249239DEST_PATH_IMAGE005
Time of day settling
Figure 679083DEST_PATH_IMAGE027
Discharging power required by downward fluctuation of wind power in control time interval
Figure 186288DEST_PATH_IMAGE028
：
Figure 867936DEST_PATH_IMAGE059
（10）
Figure 511407DEST_PATH_IMAGE060
（11）
Figure 377732DEST_PATH_IMAGE061
（12）
In the formula (I), the compound is shown in the specification,
Figure 106654DEST_PATH_IMAGE041
represent
Figure 93457DEST_PATH_IMAGE005
Before the moment of timenThe maximum value of wind storage combined output in each control time interval;
Figure 857014DEST_PATH_IMAGE042
represent
Figure 628661DEST_PATH_IMAGE005
Before the moment of time
Figure 844879DEST_PATH_IMAGE027
The power of the maximum value of the power fluctuation in the control time interval is downward;
finally, selecting
Figure 992963DEST_PATH_IMAGE026
And
Figure 486393DEST_PATH_IMAGE043
of (2) is smallerValue as energy storage System is present
Figure 428941DEST_PATH_IMAGE005
Discharge power at a time
Figure 132455DEST_PATH_IMAGE014
To simultaneously suppress 1 sum
Figure 84230DEST_PATH_IMAGE027
The wind power in each control time interval fluctuates downwards:
Figure 291221DEST_PATH_IMAGE044
（13）。
in a preferred embodiment, each control time interval is 1 minute,
Figure 545616DEST_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 should be 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 736425DEST_PATH_IMAGE001
And lower limit of state of charge
Figure 226313DEST_PATH_IMAGE002
Comparing, if the following expression is satisfied, adjusting the energy storage system to discharge the lower limit of power
Figure 818968DEST_PATH_IMAGE004
As the current time
Figure 244264DEST_PATH_IMAGE005
To the end of time
Figure 656791DEST_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 950369DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 397531DEST_PATH_IMAGE006
indicating the end time of the discharge period section,
Figure 852783DEST_PATH_IMAGE005
is the current time of day and is,
Figure 392087DEST_PATH_IMAGE007
the rated capacity of the energy storage system;
during the charging period, the real-time charge state of the energy storage system is adjusted
Figure 223776DEST_PATH_IMAGE001
And upper limit of state of charge
Figure 525445DEST_PATH_IMAGE008
Comparing, if the following expression is satisfied, adjusting the energy storage system to charge the upper limit of the power
Figure 417177DEST_PATH_IMAGE010
As the current time
Figure 679663DEST_PATH_IMAGE005
To the end of time
Figure 315043DEST_PATH_IMAGE011
The charging power of (a) is charged.
Figure 736797DEST_PATH_IMAGE009
Wherein, the first and the second end of the pipe are connected with each other,
Figure 799431DEST_PATH_IMAGE011
indicating the end time of the charging interval.
Real-time state of charge of the above energy storage system
Figure 408267DEST_PATH_IMAGE001
The calculation formula is as follows:
Figure 457126DEST_PATH_IMAGE062
（14）
in the formula (I), the compound is shown in the specification,
Figure 733386DEST_PATH_IMAGE046
in order to provide the charging efficiency of the energy storage system,
Figure 966921DEST_PATH_IMAGE047
in order to achieve the discharge efficiency of the energy storage system,
Figure 328633DEST_PATH_IMAGE048
when the time is longer than the time indicated by charging,
Figure 181182DEST_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 577528DEST_PATH_IMAGE005
The state of charge and the charge-discharge power satisfy the following inequality constraints:
Figure 716386DEST_PATH_IMAGE050
（15）
Figure 299814DEST_PATH_IMAGE051
（16）
Figure 80688DEST_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 708372DEST_PATH_IMAGE016
in order to control the time interval,
Figure 283710DEST_PATH_IMAGE010
represents the upper charging power limit of the energy storage system,
Figure 354434DEST_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 SOC upper limit is 0.9, and the SOC lower limit 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 (5)

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;
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 31372DEST_PATH_IMAGE001
（1）
in the formula (I), the compound is shown in the specification,
Figure 462353DEST_PATH_IMAGE002
for wind farms at
Figure 762885DEST_PATH_IMAGE003
The actual wind power at the moment is,
Figure 595711DEST_PATH_IMAGE004
for energy storage systems in
Figure 956286DEST_PATH_IMAGE003
The charging power at the moment of time is,
Figure 625295DEST_PATH_IMAGE005
for automatic power generation control
Figure 729518DEST_PATH_IMAGE003
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 885693DEST_PATH_IMAGE003
Time-stationary 1 control time interval
Figure 479485DEST_PATH_IMAGE006
Charging power required by upward fluctuation of wind power in battery
Figure 822742DEST_PATH_IMAGE007
：
Figure 527392DEST_PATH_IMAGE008
（2）
Figure 272494DEST_PATH_IMAGE009
（3）
Figure 37188DEST_PATH_IMAGE010
（4）
In the formula (I), the compound is shown in the specification,
Figure 867741DEST_PATH_IMAGE011
and
Figure 625350DEST_PATH_IMAGE012
respectively at the wind farm
Figure 490538DEST_PATH_IMAGE013
Time of day and
Figure 426133DEST_PATH_IMAGE003
wind and storage combined output at any moment;
Figure 478403DEST_PATH_IMAGE014
to represent
Figure 790435DEST_PATH_IMAGE003
The actual wind power at the moment and
Figure 775709DEST_PATH_IMAGE013
difference of wind-storage combined output at each moment;
Figure 819888DEST_PATH_IMAGE015
representing the maximum limit for allowing power fluctuation within 1 control interval,
Figure 421771DEST_PATH_IMAGE016
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 209598DEST_PATH_IMAGE003
Time of day stabilization
Figure 596848DEST_PATH_IMAGE017
Charging power required by upward fluctuation of wind power in control time interval
Figure 811929DEST_PATH_IMAGE018
：
Figure 166687DEST_PATH_IMAGE019
（5）
Figure 758205DEST_PATH_IMAGE020
（6）
Figure 452492DEST_PATH_IMAGE021
（7）
In the formula (I), the compound is shown in the specification,
Figure 900791DEST_PATH_IMAGE022
represent
Figure 414949DEST_PATH_IMAGE003
Before the moment of time
Figure 606896DEST_PATH_IMAGE017
The minimum value of wind-storage combined output in each control time interval;
Figure 155689DEST_PATH_IMAGE023
represent
Figure 978151DEST_PATH_IMAGE003
Before the moment of time
Figure 291190DEST_PATH_IMAGE017
The power of the power fluctuation minimum value in each control time interval is increased;
Figure 224511DEST_PATH_IMAGE024
indicating permission
Figure 690127DEST_PATH_IMAGE017
A maximum limit for upward power fluctuation within each control time interval;
finally, selecting
Figure 417912DEST_PATH_IMAGE007
And
Figure 172241DEST_PATH_IMAGE018
the larger value of the sum is taken as the energy storage system is at present
Figure 971570DEST_PATH_IMAGE003
Charging power at a time
Figure 229376DEST_PATH_IMAGE004
To simultaneously suppress 1 sum
Figure 190379DEST_PATH_IMAGE017
The wind power in each control time interval fluctuates upwards:
Figure 166425DEST_PATH_IMAGE025
（8）；
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 254598DEST_PATH_IMAGE026
And lower limit of state of charge
Figure 366910DEST_PATH_IMAGE027
Make a comparison if
Figure 764393DEST_PATH_IMAGE028
Adjusting the energy storage system to discharge the lower power limit
Figure 227736DEST_PATH_IMAGE029
As the current time
Figure 306550DEST_PATH_IMAGE003
To the end of time
Figure 70107DEST_PATH_IMAGE030
Discharging with the discharge power of (1); wherein the content of the first and second substances,
Figure 638492DEST_PATH_IMAGE030
indicating the end time of the discharge interval section,
Figure 323551DEST_PATH_IMAGE003
as the current time of day, the time of day,
Figure 252061DEST_PATH_IMAGE031
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 338966DEST_PATH_IMAGE026
And upper limit of state of charge
Figure 78252DEST_PATH_IMAGE032
Make a comparison if
Figure 250607DEST_PATH_IMAGE033
Adjusting the energy storage system to charge the upper limit of the power
Figure 733541DEST_PATH_IMAGE034
As the current time
Figure 940532DEST_PATH_IMAGE003
To the end of time
Figure 788402DEST_PATH_IMAGE035
Charging with the charging power; wherein the content of the first and second substances,
Figure 510370DEST_PATH_IMAGE035
indicating the end time of the charging interval。
2. Method according to claim 1, 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 469099DEST_PATH_IMAGE003
Discharge power required by downward fluctuation of wind power within 1 control time interval is stabilized constantly
Figure 343645DEST_PATH_IMAGE036
：
Figure 96838DEST_PATH_IMAGE037
（9）
Then, calculating the energy storage system
Figure 306102DEST_PATH_IMAGE003
Time of day settling
Figure 334101DEST_PATH_IMAGE017
Discharging power required by downward fluctuation of wind power in each control time interval
Figure 46842DEST_PATH_IMAGE018
：
Figure 502094DEST_PATH_IMAGE038
（10）
Figure 870759DEST_PATH_IMAGE039
（11）
Figure 233607DEST_PATH_IMAGE040
（12）
In the formula (I), the compound is shown in the specification,
Figure 269696DEST_PATH_IMAGE041
to represent
Figure 941855DEST_PATH_IMAGE003
Before the moment of time
Figure 797815DEST_PATH_IMAGE017
The maximum value of wind-storage combined output in each control time interval;
Figure 964354DEST_PATH_IMAGE042
to represent
Figure 120529DEST_PATH_IMAGE003
Before the moment of time
Figure 652005DEST_PATH_IMAGE017
The power of the maximum value of the power fluctuation in the control time interval is downward;
finally, selecting
Figure 57578DEST_PATH_IMAGE016
And
Figure 699912DEST_PATH_IMAGE043
is currently used as the energy storage system
Figure 507331DEST_PATH_IMAGE003
Discharge power at a time
Figure 209708DEST_PATH_IMAGE004
To simultaneously suppress 1 sum
Figure 853310DEST_PATH_IMAGE017
Wind power direction in each control time intervalThe following fluctuations:
Figure 299335DEST_PATH_IMAGE044
（13）。
3. method according to claim 1 or 2, characterized in that each control time interval
Figure 961260DEST_PATH_IMAGE006
The time is 1 minute and the time is less,
Figure 834538DEST_PATH_IMAGE017
the value is 10.
4. The method of claim 1, wherein the real-time state of charge of the energy storage system
Figure 214704DEST_PATH_IMAGE026
The calculation formula of (c) is:
Figure 729999DEST_PATH_IMAGE045
（14）
in the formula (I), the compound is shown in the specification,
Figure 184114DEST_PATH_IMAGE046
in order to provide the charging efficiency of the energy storage system,
Figure 290610DEST_PATH_IMAGE047
in order to achieve the discharge efficiency of the energy storage system,
Figure 95755DEST_PATH_IMAGE048
time is indicative of the charging power,
Figure 195167DEST_PATH_IMAGE049
time represents the discharge power; and at any time
Figure 769368DEST_PATH_IMAGE003
The state of charge and the charge-discharge power satisfy the following inequality constraints:
Figure 46766DEST_PATH_IMAGE050
（15）
Figure 339207DEST_PATH_IMAGE051
（16）
Figure 727463DEST_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 421749DEST_PATH_IMAGE006
in order to control the time interval,
Figure 73310DEST_PATH_IMAGE053
represents the upper charging power limit of the energy storage system,
Figure 649785DEST_PATH_IMAGE029
the lower limit of the energy storage discharge power.
5. The method of claim 1,
Figure 779415DEST_PATH_IMAGE054
，
Figure 141258DEST_PATH_IMAGE055
。
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