CN109494763B - Method for restraining wind power fluctuation by battery participation - Google Patents

Method for restraining wind power fluctuation by battery participation Download PDF

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CN109494763B
CN109494763B CN201811295413.1A CN201811295413A CN109494763B CN 109494763 B CN109494763 B CN 109494763B CN 201811295413 A CN201811295413 A CN 201811295413A CN 109494763 B CN109494763 B CN 109494763B
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wind power
storage battery
capacity
condition
battery
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CN109494763A (en
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欧阳强
左浩
李家珏
张涛
邵宝珠
李胜辉
孙峰
戈阳阳
滕云
张强
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State Grid Corp of China SGCC
Shenyang University of Technology
State Grid Liaoning Electric Power Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
Shenyang University of Technology
State Grid Liaoning Electric Power Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power 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
    • H02J3/24—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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/386—
    • 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]
    • 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 belongs to the technical field of smart power grids, and particularly relates to a method for restraining wind power fluctuation by battery participation, which is a method for stabilizing wind power fluctuation based on battery energy storage and effectively restrains power grid fluctuation caused by unstable wind power. The method comprises the steps of adopting different control methods for wind power plants with different installed capacities; carrying out storage battery input or removal calculation aiming at wind power plants with different installed capacities; when s is more than 1 and less than or equal to 5, judging whether the storage battery is put into the climbing slope or not; when the pair is descended again
Figure DDA0001851053320000011
Judging; when s is more than 5, judging whether the storage battery is put into the climbing slope or not, and then descending
Figure DDA0001851053320000012
Judging; and the mathematical model is used for inhibiting wind power fluctuation by matching the wind power with the storage battery in the states of climbing, leveling and descending. The wind power generation system carries out battery energy storage on the wind power of the wind power plant, carries out battery energy storage under the condition of large wind power output, consumes part of wind power and ensures the stability of a power grid. The problem of frequency fluctuation when the traditional unit can not meet the requirements due to increased load is solved, and the power supply reliability and stability of the power system are guaranteed.

Description

Method for restraining wind power fluctuation by battery participation
Technical Field
The invention belongs to the technical field of smart power grids, and particularly relates to a method for restraining wind power fluctuation by battery participation, which is a method for stabilizing wind power fluctuation based on battery energy storage and effectively restrains power grid fluctuation caused by unstable wind power.
Background
In the current wind power generation continuous grid-connected power system, due to uncertainty and volatility of wind power generation, more and more challenges are brought to safe and reliable operation of a power grid, the regulations for accessing wind power plants with different installed capacities into the power system are that in the wind power plant with the installed capacity of less than 30MW, the maximum variation within 10min is 20MW, the maximum variation within 1min is 6MW, in the power plant with the installed capacity of 30MW-150MW, the maximum variation within 1min is not more than 1/5 of the installed capacity, the maximum variation within 10min is not more than 2/3 of the installed capacity, in the wind power plant with the installed capacity of more than 150MW, the maximum variation within 1min is not more than 30MW, and the maximum variation within 10min is not more than 100 MW. Due to the limitation of the condition requirements, the wind power plant can hardly reach the grid-connected condition under the condition of large weather change, and a large amount of wind abandon is caused.
Disclosure of Invention
The invention provides a method for restraining wind power fluctuation by a battery based on the defects of the technology and the influence of wind power output fluctuation on the stable operation of a power grid, and the method is a method for restraining wind power fluctuation based on battery energy storage. The wind power station grid-connected wind power generation system aims at solving the technical problem that a large amount of wind abandon phenomena are generated in the grid-connected process of a wind power station.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for restraining wind power fluctuation by a battery comprises the following steps:
step 1, adopting different control methods for wind power plants with different installed capacities;
step 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition limit modeling on wind power plants with different installed capacities:
order to
Figure GDA0003494667810000011
In the above formula: s represents a coefficient for judging installed capacity of wind power plant, g1Represents the average variation of wind power output in one minute, g10Representing the average variation of wind power output within ten minutes; pzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1To indicate one minutePrevious force; pd10Representing the force applied ten minutes ago;
step 3, when s is more than 1 and less than or equal to 5, judging whether the storage battery is put into the climbing slope or not; when the pair is descended again
Figure GDA0003494667810000021
Judging;
step 4, when s is more than 5, judging whether the storage battery is put into the climbing slope or not, and then descending the slope
Figure GDA0003494667810000022
Judging;
and 5, solving a mathematical model for restraining wind power fluctuation by matching the storage battery under the states of wind power climbing, leveling and descending.
The step 1 comprises the following steps: adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of the wind power plant as PzCollecting the real-time output of the wind power plant, and setting the current output of the wind power plant as PdThe output before one minute is Pd1The output before ten minutes is Pd10。
The step 2 comprises the following steps: the method comprises the following steps of calculating the input or removal of a storage battery for wind power plants with different installed capacities, ensuring real-time judgment for wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition limit modeling on wind power plants with different installed capacities:
order to
Figure GDA0003494667810000023
In the above formula: s represents a coefficient for judging installed capacity of wind power plant, g1Represents the average variation of wind power output in one minute, g10Representing the average variation of wind power output within ten minutes; pzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago;
when s is less than or equal to 1, whether wind power climbing is charged for power storage or notThe pool is judged firstly
Figure GDA0003494667810000024
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝2ln(Pd-Pd1) In the formula Pdc1Representing the energy storage capacity of the battery required to be input to meet the 1-minute fluctuation quantity of the wind power; if the condition is not satisfied, proceed
Figure GDA0003494667810000025
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝ln(Pd-Pd1) In the formula Pdc10The battery energy storage capacity required to be input when the wind power fluctuation quantity within 10 minutes is met is shown, and a storage battery is not required to be connected when the condition is not met;
when the wind power is reduced, whether the storage battery is put into the wind power generation device to discharge or not is judged, and firstly, the judgment is carried out
Figure GDA0003494667810000031
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝2ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure GDA0003494667810000032
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝2(Pd-Pd1) And when the condition is not met, the storage battery does not need to be connected for discharging.
The step 3 comprises the following steps: when s is more than 1 and less than or equal to 5, whether the storage battery is put into the climbing slope or not is judged, and firstly, the storage battery is put into the climbing slope
Figure GDA0003494667810000033
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝5ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure GDA0003494667810000034
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝4(Pd-Pd1) When the condition is not met, the storage battery does not need to be accessed;
when the pair is descended again
Figure GDA0003494667810000035
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝5ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure GDA0003494667810000036
Judging, calculating the grid-connected capacity of the storage battery when the condition is met, and performing discharge power Pdc10＝4(Pd-Pd1) And when the condition is not met, the storage battery does not need to be accessed.
The step 4 comprises the following steps: when s is more than 5, whether the storage battery is put into the climbing slope is judged, and firstly, the storage battery is put into the climbing slope
Figure GDA0003494667810000037
Judging that if the condition is satisfied, starting to put the storage battery for storing energy, calculating the capacity of the put storage battery according to the following formula,
Figure GDA0003494667810000038
if the condition is not satisfied, proceed
Figure GDA0003494667810000039
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met,
Figure GDA00034946678100000310
when the condition is not met, the storage battery does not need to be accessed;
then the descent is carried out
Figure GDA0003494667810000041
If the condition is satisfied, the battery is started to be charged for discharging, the following formula is calculated for the charged battery capacity,
Figure GDA0003494667810000042
if the condition is not satisfied, proceed
Figure GDA0003494667810000043
Judging that the grid-connected capacity of the storage battery is calculated when the condition is met,
Figure GDA0003494667810000044
when the condition is not met, the storage battery does not need to be connected for discharging;
wherein, PzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago.
The step 5 comprises the following steps: solving a mathematical model for restraining wind power fluctuation by matching with a storage battery in a state of climbing, leveling and descending wind power, and setting n for a wind power plant smaller than 30MW1One, 30MW < n2≤150MW n2More than 150MW having n3A plurality of; the input quantity is (n)1+n2+n3)Pd1+(n1+n2+n3)Pd10。
The method for restraining the battery participating in wind power fluctuation comprises the following steps:
step 1, adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 500MW, and setting the current output of the wind power plant as Pd300MW, power P one minute agod1305MW, power P ten minutes agod10450 MW; judging the wind power output fluctuation condition and the capacity of the wind power plant, and controlling the output so as to input the energy storage of the storage battery;
step 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition-limited modeling on wind power plants with different installed capacities; the specific calculation by the flow is as follows:
Figure GDA0003494667810000045
Figure GDA0003494667810000051
in the formula, the installed capacity judgment coefficient of the S wind power plant is 16.67 g1The average variation of wind power output in one minute is 5MW, g10The average variable quantity of the wind power output within ten minutes is-15 MW, and the stabilizing effect of the storage battery is not needed in the process;
step 3, when the installed capacity of a certain wind power plant is PzAcquiring the real-time output of the wind power plant at 25MW, and setting the current output of the wind power plant as Pd20MW, power P one minute agod112MW, power P ten minutes agod10＝20MW；
Figure GDA0003494667810000052
Whether to put the storage battery into the storage battery is judged firstly
Figure GDA0003494667810000053
When the condition is satisfied, the accumulator starts to be put into the storage tank for storing energy, the capacity of the put accumulator is calculated by the following formula, Pdc1＝2ln(Pd-Pd1) 2ln 8; therefore, the storage battery grid connection is needed, and the grid connection capacity is 4ln4 MW;
step 4, when the installed capacity of a certain wind power plant is PzCollecting the real-time output of the wind power plant at 250MW, and setting the current output of the wind power plant as Pd150MW, power P one minute agod1140MW, power P ten minutes agod10＝230MW；
When s is 8.3 > 5, whether or not to put the storage battery is judged, and firstly, the storage battery is put into
Figure GDA0003494667810000054
The storage battery is not required to be put into the storage battery for energy storage when the conditions are not met, and the process is carried out when the conditions are not met
Figure GDA0003494667810000055
And the judgment is carried out,
Figure GDA0003494667810000056
the condition is not met, and the storage battery is not required to be accessed;
then proceed with
Figure GDA0003494667810000057
Therefore, the calculation does not satisfy the condition, the battery does not need to be started to be charged for discharging, the following formula is calculated for the charged battery capacity,
Figure GDA0003494667810000061
the following conditions are determined to proceed
Figure GDA0003494667810000062
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, and obtaining the grid-connected capacity
Figure GDA0003494667810000063
In conclusion, the storage battery is not required to be connected for discharging;
step 5, setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 120MW, and setting the current output of the wind power plant as Pd80MW, power P one minute agod140MW, P, force before ten minutesd10＝50MW；
Figure GDA0003494667810000064
So that s is more than 1 and less than or equal to 5, and firstly, calculating to judge whether to put the storage battery into the storage battery
Figure GDA0003494667810000065
Not satisfying the conditions, not requiring the input of a storage battery for energy storage, Pdc10; to carry out
Figure GDA0003494667810000066
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, Pdc10When the sum is 0, the storage battery is not required to be connected in the calculation;
step 6, performing overall calculation on the wind power plant to obtain a final calculation result of (n)1+n2+n3)Pd1+(n1+n2+n3)Pd104ln4 MW; therefore, the capacity of the currently incorporated storage battery is 4ln4MW, and the current wind power fluctuation can be effectively restrained.
The invention has the following advantages and beneficial effects:
the wind power generation system aims at the problem that in the prior art, a large amount of wind abandon is generated in the grid connection process of the wind power plant, the battery energy storage is carried out on the wind power of the wind power plant, the battery energy storage is carried out under the condition that the wind power output is large, part of the wind power is consumed, and the stability of a power grid is ensured. When the wind power plant output is low, the storage battery is required to discharge, the phenomenon of insufficient wind power output is filled, when the wind power output is low, the battery is discharged, the frequency fluctuation caused by the fact that the traditional unit cannot meet the requirement due to load increase is solved, and the power supply reliability and stability of the power system are guaranteed.
Drawings
The invention will be described in further detail with reference to the drawings and specific embodiments for facilitating understanding and practicing of the invention by those of ordinary skill in the art, but it should be understood that the scope of the invention is not limited by the specific embodiments.
FIG. 1 is an incorporated control diagram of the storage battery of the present invention following wind power;
FIG. 2 is a flow chart of the control for stabilizing wind power fluctuation according to the present invention.
Detailed Description
The invention relates to a method for restraining wind power fluctuation by a battery, which comprises the following steps:
step 1, adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of the wind power plant as PzCollecting the real-time output of the wind power plant, and setting the current output of the wind power plant as PdThe output before one minute is Pd1The output before ten minutes is Pd10。
And 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system. Firstly, carrying out condition-limited modeling on wind power plants with different installed capacities.
Order to
Figure GDA0003494667810000071
In the above formula: s represents a coefficient for judging installed capacity of wind power plant, g1Represents the average variation of wind power output in one minute, g10Represents the average variation of wind power output within ten minutes, PzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago.
When s is less than or equal to 1, judging whether the wind power climbing is put into the storage battery or not, and firstly, carrying out
Figure GDA0003494667810000072
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝2ln(Pd-Pd1) In the formula Pdc1The battery energy storage capacity required to be input to satisfy the 1-minute fluctuation amount of the wind power is represented. If the condition is not satisfied, proceed
Figure GDA0003494667810000073
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝ln(Pd-Pd1) In the formula Pdc10Represents the input required by meeting the wind power fluctuation quantity of 10 minutesWhen the energy storage capacity of the battery is not satisfied, the storage battery is not required to be accessed.
When the wind power is reduced, whether the storage battery is put into the wind power generation device to discharge or not is judged, and firstly, the judgment is carried out
Figure GDA0003494667810000074
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝2ln(Pd-Pd1). If the condition is not satisfied, proceed
Figure GDA0003494667810000081
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝2(Pd-Pd1) And when the condition is not met, the storage battery does not need to be connected for discharging.
Step 3, when s is more than 1 and less than or equal to 5, judging whether the storage battery is put into the climbing slope or not, and firstly, carrying out
Figure GDA0003494667810000082
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝5ln(Pd-Pd1). If the condition is not satisfied, proceed
Figure GDA0003494667810000083
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝4(Pd-Pd1) And when the condition is not met, the storage battery does not need to be accessed.
When the pair is descended again
Figure GDA0003494667810000084
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝5ln(Pd-Pd1). If the condition is not satisfied, proceed
Figure GDA0003494667810000085
Judging, calculating the grid-connected capacity of the storage battery when the condition is met, and performing discharge power Pdc10＝4(Pd-Pd1) And when the condition is not met, the storage battery does not need to be accessed.
Step 4, when s is more than 5, judging whether the storage battery is put into the climbing slope or not, and firstly, carrying out
Figure GDA0003494667810000086
Judging that if the condition is satisfied, starting to put the storage battery for storing energy, calculating the capacity of the put storage battery according to the following formula,
Figure GDA0003494667810000087
if the condition is not satisfied, proceed
Figure GDA0003494667810000088
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met,
Figure GDA0003494667810000089
when the condition is not met, the storage battery does not need to be accessed.
Then the descent is carried out
Figure GDA00034946678100000810
If the condition is satisfied, the battery is started to be charged for discharging, the following formula is calculated for the charged battery capacity,
Figure GDA00034946678100000811
if the condition is not satisfied, proceed
Figure GDA0003494667810000091
Judging that the grid-connected capacity of the storage battery is calculated when the condition is met,
Figure GDA0003494667810000092
when the condition is not met, the storage battery does not need to be connected for discharging.
Step 5, the wind power is matched with a storage battery in a climbing, leveling and descending stateSolving a mathematical model for restraining wind power fluctuation in a combined mode, and setting n in a wind power plant smaller than 30MW1One, 30MW < n2≤150MWn2More than 150MW having n3And (4) respectively. The input quantity is (n)1+n2+n3)Pd1+(n1+n2+n3)Pd10。
Example 1:
step 1, adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 500MW, and setting the current output of the wind power plant as Pd300MW, power P one minute agod1305MW, power P ten minutes agod10450 MW. As shown in FIG. 1, FIG. 1 is an integrated control diagram of the storage battery of the invention following wind power. Wind power output fluctuation conditions and wind power plant capacity judgment are carried out through the graph 1, output control is carried out, and accordingly input of storage battery energy storage is carried out.
And 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system. Firstly, carrying out condition-limited modeling on wind power plants with different installed capacities. As shown in fig. 2, fig. 2 is a flow chart of the control for stabilizing wind power fluctuation according to the present invention. The following is specifically calculated by the flow chart:
Figure GDA0003494667810000093
Figure GDA0003494667810000094
in the formula, the installed capacity judgment coefficient of the S wind power plant is 16.67 g1The average variation of wind power output in one minute is 5MW, g10The average variable quantity of the wind power output within ten minutes is-15 MW, and the process does not need the stabilizing effect of the storage battery.
Step 3, when a certain wind power is generatedInstalled capacity of the farm is PzAcquiring the real-time output of the wind power plant at 25MW, and setting the current output of the wind power plant as Pd20MW, power P one minute agod112MW, power P ten minutes agod10＝20MW。
Figure GDA0003494667810000101
Whether to put the storage battery into the storage battery is judged firstly
Figure GDA0003494667810000102
When the condition is satisfied, the accumulator starts to be put into the storage tank for storing energy, the capacity of the put accumulator is calculated by the following formula, Pdc1＝2ln(Pd-Pd1) 2ln 8. Therefore, the storage battery needs to be connected to the grid, and the grid-connected capacity is 4ln4 MW.
Step 4, when the installed capacity of a certain wind power plant is PzCollecting the real-time output of the wind power plant at 250MW, and setting the current output of the wind power plant as Pd150MW, power P one minute agod1140MW, power P ten minutes agod10＝230MW
When s is 8.3 > 5, whether or not to put the storage battery is judged, and firstly, the storage battery is put into
Figure GDA0003494667810000103
The storage battery is not required to be put into the storage battery for energy storage when the conditions are not met, and the process is carried out when the conditions are not met
Figure GDA0003494667810000104
And the judgment is carried out,
Figure GDA0003494667810000105
the condition is not satisfied. The storage battery is not required to be connected.
Then proceed with
Figure GDA0003494667810000106
If the calculation is not satisfied, the condition is satisfied, and the charging of the storage battery is not started to discharge, and the charged storage battery is chargedThe battery capacity is calculated by the following formula,
Figure GDA0003494667810000107
the following conditions are determined to proceed
Figure GDA0003494667810000108
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, and obtaining the grid-connected capacity
Figure GDA0003494667810000111
In conclusion, the storage battery does not need to be connected for discharging.
Step 5, setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 120MW, and setting the current output of the wind power plant as Pd80MW, power P one minute agod140MW, P, force before ten minutesd10＝50MW。
Figure GDA0003494667810000112
So that s is more than 1 and less than or equal to 5, and firstly, calculating to judge whether to put the storage battery into the storage battery
Figure GDA0003494667810000113
Not satisfying the conditions, not requiring the input of a storage battery for energy storage, Pdc10. To carry out
Figure GDA0003494667810000114
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, Pdc10The sum total calculation does not require the battery to be connected.
Step 6, performing overall calculation on the wind power plant to obtain a final calculation result of (n)1+n2+n3)Pd1+(n1+n2+n3)Pd104ln4 MW. Therefore, the capacity of the currently incorporated storage battery is 4ln4MW, and the current wind power fluctuation can be effectively restrained.

Claims (7)

1. A method for restraining wind power fluctuation by a battery is characterized by comprising the following steps: the method comprises the following steps:
step 1, adopting different control methods for wind power plants with different installed capacities;
step 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition limit modeling on wind power plants with different installed capacities:
order to
Figure FDA0003494667800000011
In the above formula: s represents a coefficient for judging installed capacity of wind power plant, g1Represents the average variation of wind power output in one minute, g10Representing the average variation of wind power output within ten minutes; pzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago;
step 3, when s is more than 1 and less than or equal to 5, judging whether the storage battery is put into the climbing slope or not; when the pair is descended again
Figure FDA0003494667800000012
Judging;
step 4, when s is more than 5, judging whether the storage battery is put into the climbing slope or not, and then descending the slope
Figure FDA0003494667800000013
Judging;
and 5, solving a mathematical model for restraining wind power fluctuation by matching the storage battery under the states of wind power climbing, leveling and descending.
2. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the step 1 comprises the following steps: adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of the wind power plant as PzThe real-time output of the wind power plant is collected,let the current output of the wind farm be PdThe output before one minute is Pd1The output before ten minutes is Pd10。
3. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the step 2 comprises the following steps: the method comprises the following steps of calculating the input or removal of a storage battery for wind power plants with different installed capacities, ensuring real-time judgment for wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition limit modeling on wind power plants with different installed capacities:
order to
Figure FDA0003494667800000014
In the above formula: s represents a coefficient for judging installed capacity of wind power plant, g1Represents the average variation of wind power output in one minute, g10Representing the average variation of wind power output within ten minutes; pzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago;
when s is less than or equal to 1, judging whether the wind power climbing is put into the storage battery or not, and firstly, carrying out
Figure FDA0003494667800000021
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝2ln(Pd-Pd1) In the formula Pdc1Representing the energy storage capacity of the battery required to be input to meet the 1-minute fluctuation quantity of the wind power; if the condition is not satisfied, proceed
Figure FDA0003494667800000022
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝ln(Pd-Pd1) In the formula Pdc10The battery energy storage capacity required to be input for meeting the wind power fluctuation quantity of 10 minutes is represented, andwhen the conditions are met, the storage battery does not need to be accessed;
when the wind power is reduced, whether the storage battery is put into the wind power generation device to discharge or not is judged, and firstly, the judgment is carried out
Figure FDA0003494667800000023
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝2ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure FDA0003494667800000024
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝2(Pd-Pd1) And when the condition is not met, the storage battery does not need to be connected for discharging.
4. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the step 3 comprises the following steps: when s is more than 1 and less than or equal to 5, whether the storage battery is put into the climbing slope or not is judged, and firstly, the storage battery is put into the climbing slope
Figure FDA0003494667800000025
Judging that if the conditions are met, starting to put the storage battery for energy storage, and calculating the capacity of the put storage battery according to the following formula, Pdc1＝5ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure FDA0003494667800000026
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met, Pdc10＝4(Pd-Pd1) When the condition is not met, the storage battery does not need to be accessed;
when the pair is descended again
Figure FDA0003494667800000027
If the judgment result shows that the condition is satisfied, the battery is started to be charged for discharging, the charged battery capacity is calculated by the following formula, Pdc1＝5ln(Pd-Pd1) (ii) a If the condition is not satisfied, proceed
Figure FDA0003494667800000028
Judging, calculating the grid-connected capacity of the storage battery when the condition is met, and performing discharge power Pdc10＝4(Pd-Pd1) And when the condition is not met, the storage battery does not need to be accessed.
5. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the step 4 comprises the following steps: when s is more than 5, whether the storage battery is put into the climbing slope is judged, and firstly, the storage battery is put into the climbing slope
Figure FDA0003494667800000031
Judging that if the condition is satisfied, starting to put the storage battery for storing energy, calculating the capacity of the put storage battery according to the following formula,
Figure FDA0003494667800000032
if the condition is not satisfied, proceed
Figure FDA0003494667800000033
Judging, calculating the grid-connected capacity of the storage battery when the conditions are met,
Figure FDA0003494667800000034
when the condition is not met, the storage battery does not need to be accessed;
then the descent is carried out
Figure FDA0003494667800000035
If the condition is satisfied, the battery is started to be charged for discharging, the following formula is calculated for the charged battery capacity,
Figure FDA0003494667800000036
if the condition is not satisfied, proceed
Figure FDA0003494667800000037
Judging that the grid-connected capacity of the storage battery is calculated when the condition is met,
Figure FDA0003494667800000038
when the condition is not met, the storage battery does not need to be connected for discharging;
wherein, PzRepresenting installed capacity of the wind farm; pdRepresenting the current contribution of the wind farm; pd1Representing the force applied one minute ago; pd10Representing the force applied ten minutes ago.
6. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the step 5 comprises the following steps: solving a mathematical model for restraining wind power fluctuation by matching with a storage battery in a state of climbing, leveling and descending wind power, and setting n for a wind power plant smaller than 30MW1One, 30MW < n2≤150MWn2More than 150MW having n3A plurality of; the input quantity is (n)1+n2+n3)Pd1+(n1+n2+n3)Pd10。
7. The method for suppressing wind power fluctuation of the battery according to claim 1, wherein: the method comprises the following steps:
step 1, adopting different control methods for wind power plants with different installed capacities, and setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 500MW, and setting the current output of the wind power plant as Pd300MW, power P one minute agod1305MW, power P ten minutes agod10450 MW; judging the wind power output fluctuation condition and the capacity of the wind power plant, and controlling the output so as to input the energy storage of the storage battery;
step 2, carrying out storage battery input or removal calculation on wind power plants with different installed capacities, ensuring real-time judgment on wind power fluctuation conditions and ensuring the safety and reliability of power supply of a power system; firstly, carrying out condition-limited modeling on wind power plants with different installed capacities; the specific calculation by the flow is as follows:
Figure FDA0003494667800000041
Figure FDA0003494667800000042
in the formula, the installed capacity judgment coefficient of the S wind power plant is 16.67 g1The average variation of wind power output in one minute is 5MW, g10The average variable quantity of the wind power output within ten minutes is-15 MW, and the stabilizing effect of the storage battery is not needed in the process;
step 3, when the installed capacity of a certain wind power plant is PzAcquiring the real-time output of the wind power plant at 25MW, and setting the current output of the wind power plant as Pd20MW, power P one minute agod112MW, power P ten minutes agod10＝20MW；
Figure FDA0003494667800000043
Whether to put the storage battery into the storage battery is judged firstly
Figure FDA0003494667800000044
When the condition is satisfied, the accumulator starts to be put into the storage tank for storing energy, the capacity of the put accumulator is calculated by the following formula, Pdc1＝2ln(Pd-Pd1) 2ln 8; therefore, the storage battery grid connection is needed, and the grid connection capacity is 4ln4 MW;
step 4, when the installed capacity of a certain wind power plant is PzCollecting the real-time output of the wind power plant at 250MW, and setting the current output of the wind power plant as Pd150MW, power P one minute agod1140MW, power P ten minutes agod10＝230MW；
When s is 8.3 > 5, whether to put the storage battery into the storage battery or not is carried outJudgment is first made
Figure FDA0003494667800000051
The storage battery is not required to be put into the storage battery for energy storage when the conditions are not met, and the process is carried out when the conditions are not met
Figure FDA0003494667800000052
And the judgment is carried out,
Figure FDA0003494667800000053
the condition is not met, and the storage battery is not required to be accessed;
then proceed with
Figure FDA0003494667800000054
Therefore, the calculation does not satisfy the condition, the battery does not need to be started to be charged for discharging, the following formula is calculated for the charged battery capacity,
Figure FDA0003494667800000055
the following conditions are determined to proceed
Figure FDA0003494667800000056
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, and obtaining the grid-connected capacity
Figure FDA0003494667800000057
In conclusion, the storage battery is not required to be connected for discharging;
step 5, setting the installed capacity of a certain wind power plant as PzAcquiring the real-time output of the wind power plant with the power of 120MW, and setting the current output of the wind power plant as Pd80MW, power P one minute agod140MW, P, force before ten minutesd10＝50MW；
Figure FDA0003494667800000058
So that s is more than 1 and less than or equal to 5, and firstly, calculating to judge whether to put the storage battery into the storage battery
Figure FDA0003494667800000059
Not satisfying the conditions, not requiring the input of a storage battery for energy storage, Pdc10; to carry out
Figure FDA00034946678000000510
Judging that the condition is not met, calculating the grid-connected capacity of the storage battery, Pdc10When the sum is 0, the storage battery is not required to be connected in the calculation;
step 6, performing overall calculation on the wind power plant to obtain a final calculation result of (n)1+n2+n3)Pd1+(n1+n2+n3)Pd104ln4 MW; therefore, the capacity of the currently incorporated storage battery is 4ln4MW, and the current wind power fluctuation can be effectively restrained.
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