CN114188996B - Active control method, system and medium in electrochemical energy storage power station adapted to frequency modulation function - Google Patents
Active control method, system and medium in electrochemical energy storage power station adapted to frequency modulation function Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—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
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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
- 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]
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Abstract
The invention discloses an in-station active control method, a system and a medium of an electrochemical energy storage power station adapting to a frequency modulation function, which comprise the steps of calculating the charge and discharge times of each energy storage unit of the electrochemical energy storage power station at the current moment, and receiving and dispatching a total station frequency modulation instruction value; calculating the active output change value of each energy storage unit according to the active total output of the electrochemical energy storage power station, the active output of each energy storage unit and the upper and lower limits of the active output of each energy storage unit at the moment; and then calculating to obtain the active output target value of the energy storage unit, and transmitting the active output target value to a frequency converter (PCS) of each energy storage unit for execution. On the basis of meeting the frequency modulation requirement, the invention reasonably distributes and controls the active output change value of each energy storage unit, reduces frequent and rapid switching of the charge and discharge states of the energy storage units as much as possible, reduces the aging speed of the battery of the electrochemical energy storage power station for frequency modulation, and prolongs the service life of the electrochemical energy storage power station.
Description
Technical Field
The invention relates to an active control technology of an energy storage power station, in particular to an active control method, an active control system and a medium in an electrochemical energy storage power station which are suitable for a frequency modulation function.
Background
Along with the determination of 'carbon reaching peak', 'carbon neutralization' targets, a novel power system strategic idea mainly comprising new energy is established, an energy storage power station is built on the rise of the tide, and along with the gradual reduction of the traditional frequency modulation main force-the output ratio of conventional water and thermal power plants, an electrochemical energy storage power station becomes a main power supply of power grid frequency modulation by virtue of the high-speed active response characteristic of the electrochemical energy storage power station.
In order to ensure the stability of the power grid frequency and the power flow of the cross-region tie line, the frequency modulation power supply is required to frequently and rapidly lift the active power output. The electrochemical energy storage power station frequently and rapidly rises and falls the active force, if reasonable distribution and control are not carried out, the energy storage battery can be switched back and forth between charging and discharging states, and then the energy storage battery is rapidly aged, and the service life of the electrochemical energy storage power station is greatly shortened. Therefore, there is a need for an in-station active control method and system for an electrochemical energy storage power station, which are suitable for frequency modulation, and which reasonably distributes and controls active power adjustment instructions, reduces frequent and rapid switching of the charge and discharge states of an energy storage battery, reduces the aging speed of the battery of the electrochemical energy storage power station for frequency modulation, and prolongs the service life of the electrochemical energy storage power station.
The existing methods related to power control of energy storage power stations are not few. The chinese patent document with application number 201110459445.2 discloses a method and a system for controlling power of a battery energy storage power station for frequency modulation, which support the energy storage power station to participate in the power grid frequency modulation function, but does not involve frequent and rapid switching by controlling to reduce the charge and discharge states of the energy storage battery; the chinese patent document with application number 201310260143.1 discloses a reactive power distribution and control method for a battery energy storage power station, which optimizes reactive power distribution of each energy storage converter in the energy storage power station, but does not relate to active power adjustment instruction distribution and control.
Disclosure of Invention
In order to solve the technical problem that the charge and discharge states of an energy storage battery can not be frequently and rapidly switched as far as possible in the conventional power control method of the energy storage power station, the invention provides an active control method, a system and a medium in an electrochemical energy storage power station which are suitable for a frequency modulation function.
In order to achieve the technical purpose, the technical scheme of the invention is that,
an in-station active control method of an electrochemical energy storage power station adapting to a frequency modulation function, comprising the following steps:
1) According to the length of time that the active output is kept to be zero in the active output adjustment process of the energy storage power station, the charge and discharge times n of the energy storage units at the current moment t are calculated ti The method comprises the steps of carrying out a first treatment on the surface of the Wherein the shorter the duration of zero, the n ti The larger;
2) The electrochemical energy storage power station receives the total station frequency modulation instruction value P scheduled and issued at the current moment t AGCt ；
3) According to the current time t, the active total output P of the electrochemical energy storage power station t Active force P of each energy storage unit ti Upper limit maxP of active power output of each energy storage unit ti And a lower limit minP ti Calculating the active output change value of each energy storage unit△P ti The calculation formula is as follows:
3.1 If P AGCt ≥0、P t ≥0，
3.2 If P AGCt ＜0、P t ≥0，
3.3 If P AGCt ＜0、P t ＜0，
3.4 If P AGCt ≥0、P t ＜0，
4) According to the active output change value delta P of each energy storage unit ti Obtaining the active output target value P' of each energy storage unit ti The calculation formula is as follows:
P′ ti ＝P ti +ΔP ti
5) Active output target value P' of each energy storage unit ti And the frequency converter which is issued to each energy storage unit, namely PCS, is executed.
In the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function, the charge and discharge times n of each energy storage unit in the step 1) are calculated ti The calculation principle is as follows:
1.1 Each energy storage unit n at time 0 0i Are all 0;
1.2 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and discharge is larger than or equal toAt 30min, n ti ＝n (t-1)i +1；
1.3 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and the discharge is less than 30min and more than or equal to 10min, n ti ＝n (t-1)i +2；
1.4 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (active power output is kept to be zero) of the charge and discharge is less than 10min and more than or equal to 1min, n ti ＝n (t-1)i +5；
1.5 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and the discharge is less than 1min and is more than or equal to 10s, n ti ＝n (t-1)i +10；
1.6 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and discharge is less than 10s, n ti ＝n (t-1)i +30；
1.7 After the i-th group energy storage unit replaces all the energy storage batteries, n is as follows ti Reset to 0.
In the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function, in the step 3), the total active power P of the electrochemical energy storage power station is generated at the current moment t t Active force P of each energy storage unit ti The relationship of (2) is as follows:
in the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function, in the step 3), the upper limit of the active power output maxP of each energy storage unit ti And a lower limit minP ti The calculation formula of (2) is as follows:
wherein P is iM Rated active power of energy storage unit, W ti For the current time t the energy storage unit has stored energy, maxW i 、minW i maxU for maximum storable energy and minimum storable energy of the energy storage unit, respectively ti 、minU ti Respectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxU i 、minU i The set value of the highest voltage and the set value of the lowest voltage of the single battery of the energy storage unit are respectively set.
In the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function, in the step 3.2), the calculation formula of f (i) is as follows:
wherein X is t And (5) selecting a discharging and charging energy storage unit set for the current time t.
In the active control method in the electrochemical energy storage power station adapting to the frequency modulation function, the discharge selected at the current moment t changes the charged energy storage unit set X t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
the calculation formula of g (i) in the step 2.4) is as follows:
wherein Y is t And (5) selecting a charge-to-discharge energy storage unit set for the current time t.
In the active control method in the electrochemical energy storage power station adapting to the frequency modulation function, the energy storage unit set Y from charging to discharging selected at the current moment t t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
an in-station active control system for an adaptive frequency modulation electrochemical energy storage power station comprising a microprocessor and a memory interconnected, the microprocessor being programmed or configured, the memory storing a program to perform the steps of the in-station active control method for an adaptive frequency modulation electrochemical energy storage power station.
A computer readable storage medium having stored therein a computer program programmed or configured to perform the described in-station active control method of an adaptive frequency modulation function electrochemical energy storage power station.
The method has the technical effects that the method receives and dispatches the frequency modulation instruction value of the total station by calculating the charge and discharge times of each energy storage unit of the electrochemical energy storage power station at the current moment; calculating the active output change value of each energy storage unit according to the active total output of the electrochemical energy storage power station, the active output of each energy storage unit and the upper and lower limits of the active output of each energy storage unit at the moment; and then calculating to obtain the active output target value of the energy storage unit, and transmitting the active output target value to a frequency converter (PCS) of each energy storage unit for execution. On the basis of meeting the frequency modulation requirement, the invention reasonably distributes and controls the active output change value of each energy storage unit, reduces frequent and rapid switching of the charge and discharge states of the energy storage units as much as possible, reduces the aging speed of the battery of the electrochemical energy storage power station for frequency modulation, and prolongs the service life of the electrochemical energy storage power station.
Drawings
Fig. 1 is a basic flow diagram of an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for controlling the power in the electrochemical energy storage power station adapted to the frequency modulation function in this embodiment includes the following steps:
1) According to the length of time that the active output is kept to be zero in the active output adjustment process of the energy storage power station, the charge and discharge times n of the energy storage units at the current moment t are calculated ti The method comprises the steps of carrying out a first treatment on the surface of the Wherein the shorter the duration of zero, the n ti The larger. Specifically, the calculation principle is as follows:
1.1 Each energy storage unit n at time 0 0i Are all 0;
1.2 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the standing time (the active power output is kept to be zero) of the charging and discharging is more than or equal to 30min, n ti ＝n (t-1)i +1；
1.3 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and the discharge is less than 30min and more than or equal to 10min, n ti ＝n (t-1)i +2；
1.4 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (active power output is kept to be zero) of the charge and discharge is less than 10min and more than or equal to 1min, n ti ＝n (t-1)i +5；
1.5 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and the discharge is less than 1min and is more than or equal to 10s, n ti ＝n (t-1)i +10；
1.6 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time (the active power output is kept to be zero) of the charge and discharge is less than 10s, n ti ＝n (t-1)i +30；
1.7 If the i-th group energy storage unit is replaced for all the energy storage batteries, n of the replaced i-th group energy storage unit ti Then reset to 0. But if only part of the energy storage cells are replaced, then n of the energy storage cells of the i-th group tj Remain unchanged.
2) The electrochemical energy storage power station receives the total station frequency modulation instruction value P scheduled and issued at the current moment t AGCt 。
3) According to the current time t, the active total output P of the electrochemical energy storage power station t Active force P of each energy storage unit ti Upper and lower limits maxP of active output of each energy storage unit ti 、minP ti Calculate the active output change value DeltaP of each energy storage unit ti 。
Wherein the active total output P of the electrochemical energy storage power station at the current moment t t Active force P of each energy storage unit ti The relationship of (2) is as follows:
upper limit maxP of active output of each energy storage unit ti And a lower limit minP ti The calculation formula of (2) is as follows:
wherein P is iM Rated active power of energy storage unit, W ti For the current time t the energy storage unit has stored energy, maxW i 、minW i maxU for maximum storable energy and minimum storable energy of the energy storage unit, respectively ti 、minU ti Respectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxU i 、minU i The set value of the highest voltage and the set value of the lowest voltage of the single battery of the energy storage unit are respectively set.
From the above parameters, ΔP is calculated ti The formula of (2) is as follows:
3.1 If P AGCt ≥0、P t ≥0，
3.2 If P AGCt ＜0、P t ≥0，
The formula of f (i) is as follows:
wherein X is t And (5) selecting a discharging and charging energy storage unit set for the current time t. X is X t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
3.3 If P AGCt ＜0、P t ＜0，
3.4 If P AGCt ≥0、P t ＜0，
The formula of g (i) is as follows:
wherein Y is t And (5) selecting a charge-to-discharge energy storage unit set for the current time t. Y is Y t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
4) According to the active output change value delta P of each energy storage unit ti Obtaining the active output target value P' of each energy storage unit ti The calculation formula is as follows:
P′ ti ＝P ti +ΔP ti 。
5) Active output target value P' of each energy storage unit ti And a frequency converter (PCS) which is connected to each energy storage unit.
In summary, the method in this embodiment includes the steps of calculating the charge and discharge times of each energy storage unit of the electrochemical energy storage power station at the current moment, and receiving the frequency modulation command value sent by the dispatching station; calculating the active output change value of each energy storage unit according to the active total output of the electrochemical energy storage power station, the active output of each energy storage unit and the upper and lower limits of the active output of each energy storage unit at the moment; and then calculating to obtain the active output target value of the energy storage unit, and transmitting the active output target value to a frequency converter (PCS) of each energy storage unit for execution. According to the method, on the basis of meeting the frequency modulation requirement, the active output change value of each energy storage unit is reasonably distributed and controlled, the frequent and rapid switching of the charging and discharging states of the energy storage units is reduced as much as possible, the aging speed of the battery of the electrochemical energy storage power station for frequency modulation is reduced, and the service life of the electrochemical energy storage power station is prolonged.
According to an embodiment of the invention, the invention further provides an in-station active control system of the electrochemical energy storage power station adapting to the frequency modulation function and a computer readable storage medium.
An in-station active control system of an electrochemical energy storage power station adapting to a frequency modulation function, comprising:
one or more microprocessors programmed or configured;
a memory for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the aforementioned methods.
In the specific use, the user can execute the active control method in the electrochemical energy storage power station adapting to the frequency modulation function through the active control system in the electrochemical energy storage power station adapting to the frequency modulation function, thereby realizing the active control on the electrochemical energy storage power station.
Similarly, the computer readable medium provided by the invention has a programmed or configured computer program stored thereon, and when the computer program is executed by a processor, the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function can be realized.
Claims (8)
1. An in-station active control method of an electrochemical energy storage power station adapting to a frequency modulation function is characterized by comprising the following steps:
1) According to the length of time that the active output is kept to be zero in the active output adjustment process of the energy storage power station, the charge and discharge times n of the energy storage units at the current moment t are calculated ti The method comprises the steps of carrying out a first treatment on the surface of the Wherein the shorter the duration of zero, the n ti The larger;
2) The electrochemical energy storage power station receives the total station frequency modulation instruction value P scheduled and issued at the current moment t AGCt ；
3) According to the current time t, the active total output P of the electrochemical energy storage power station t Active force P of each energy storage unit ti Upper limit maxP of active power output of each energy storage unit ti And a lower limit minP ti Calculating the active output change value delta P of each energy storage unit ti The calculation formula is as follows:
3.1 If P AGCt ≥0、P t ≥0，
3.2 If P AGCt <0、P t ≥0，
3.3 If P AGCt <0、P t <0，
3.4 If P AGCt ≥0、P t <0，
4) According to the active output change value delta P of each energy storage unit ti Obtaining the active output target value P' of each energy storage unit ti The calculation formula is as follows:
P ti ′＝P ti +ΔP ti
5) Active output target value P' of each energy storage unit ti The frequency converter which reaches each energy storage unit, namely PCS execution;
in step 3.2), the calculation formula of f (i) is as follows:
wherein X is t A discharging-charging energy storage unit set selected for the current time t;
the calculation formula of g (i) in step 2.4) is as follows:
wherein Y is t And (5) selecting a charge-to-discharge energy storage unit set for the current time t.
2. The method for in-station active control of an electrochemical energy storage power station adapted to a frequency modulation function according to claim 1, wherein the number of times n of charging and discharging each energy storage unit in step 1) is ti The calculation principle is as follows:
1.1 Each energy storage unit n at time 0 0i Are all 0;
1.2 During the active output adjustment of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time of charging and discharging is more than or equal to 30min, n ti ＝n (t-1)i +1；
1.3 During the active power output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time of the charging and discharging is less than 30min, more than or equal to 10min, n ti ＝n (t-1)i +2；
1.4 During the active output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time of the charging and discharging is less than 10min, more than or equal to 1min, n ti ＝n (t-1)i +5；
1.5 During the active output adjustment process of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time of the charging and discharging is less than 1min, more than or equal to 10s, n ti ＝n (t-1)i +10；
1.6 During the active output adjustment of the energy storage power station, the ith group of energy storage units are charged to discharge or discharged to charge, if the rest time of the charging and discharging is less than 10s, n ti ＝n (t-1)i +30；
1.7 After the i-th group energy storage unit replaces all the energy storage batteries, n is as follows ti Reset to 0.
3. The frequency modulation compliant electrochemical energy storage power station of claim 1 havingThe power control method is characterized in that in the step 3), the active total output P of the electrochemical energy storage power station at the current moment t t Active force P of each energy storage unit ti The relationship of (2) is as follows:
4. the method for in-station active control of an electrochemical energy storage power station adapted to a frequency modulation function according to claim 1, wherein in step 3), each energy storage unit has an upper active power threshold maxP ti And a lower limit minP ti The calculation formula of (2) is as follows:
wherein P is iM Rated active power of energy storage unit, W ti For the current time t the energy storage unit has stored energy, maxW i 、minW i maxU for maximum storable energy and minimum storable energy of the energy storage unit, respectively ti 、minU ti Respectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxU i 、minU i The set value of the highest voltage and the set value of the lowest voltage of the single battery of the energy storage unit are respectively set.
5. The method for in-station active control of an electrochemical energy storage power station adapted to frequency modulation as claimed in claim 1, wherein the set of discharged-to-charged energy storage cells X is selected at the current time t t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
6. the method for in-station active control of an electrochemical energy storage power station adapted to a frequency modulation function according to claim 1, wherein the set of charge-to-discharge energy storage cells Y selected at the current time t t The selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the collection is minimum, and the energy storage units in the collection can meet the requirement of active output adjustment; the mathematical expression is:
7. an in-station active control system for an electrochemical energy storage power station adapted for frequency modulation comprising a microprocessor and a memory interconnected, the microprocessor being programmed or configured, the memory storing a program for performing the steps of the in-station active control method for an electrochemical energy storage power station adapted for frequency modulation according to any one of claims 1 to 6.
8. A computer readable storage medium having stored therein a computer program programmed or configured to perform the method of modulating power in an electrochemical energy storage power station of any one of claims 1 to 6.
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