CN114188996A - Electrochemical energy storage power station active control method, system and medium adapting to frequency modulation function - Google Patents
Electrochemical energy storage power station active control method, system and medium adapting 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 electrochemical energy storage power station in-station active control method, system and medium adaptive to a frequency modulation function, which comprises the steps of calculating the charging and discharging times of each energy storage unit of an electrochemical energy storage power station at the current moment, and receiving, dispatching and issuing 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 active output upper and lower limits of each energy storage unit at the moment; and calculating to obtain the target value of the active power output of the energy storage unit, and transmitting the 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 charging and discharging states of the energy storage units as much as possible, reduces the battery aging speed 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 power control technology of an energy storage power station, in particular to an electrochemical energy storage power station active power control method, system and medium adapting to a frequency modulation function.
Background
With the determination of the targets of carbon peak reaching and carbon neutralization, a novel power system strategy thought mainly based on new energy is provided, the energy storage power station is brought to the construction of climax, and with the gradual decrease of the ratio of the traditional main power of frequency modulation, namely the output of conventional water and thermal power plants, the electrochemical energy storage power station becomes a main power source for frequency modulation of a power grid with the high-speed active response characteristic.
In order to ensure the stability of the power grid frequency and the cross-regional tie line tide, the frequency modulation power supply is required to frequently and rapidly lift and output active power. The electrochemical energy storage power station frequently and rapidly rises and falls active power output, and if reasonable distribution and control are not carried out, the energy storage battery can be switched back and forth between a charging state and a discharging state, so that the energy storage battery is rapidly aged, and the service life of the electrochemical energy storage power station is greatly shortened. Therefore, an electrochemical energy storage power station active control method and system adaptive to the frequency modulation function are needed, which reasonably distribute and control an active power adjustment instruction, reduce frequent and rapid switching of charging and discharging states of an energy storage battery, reduce the aging speed of the electrochemical energy storage power station battery for frequency modulation, and prolong the service life of the electrochemical energy storage power station.
Existing methods related to power control of energy storage power stations are numerous. For example, chinese patent application No. 201110459445.2 discloses a battery energy storage power station power control method and system for frequency modulation, which support the energy storage power station to participate in the power grid frequency modulation function, but do not relate to reducing frequent and rapid switching of the charging and discharging states of the energy storage battery through control; 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 the reactive power distribution of each energy storage converter in the energy storage power station, but does not relate to the distribution and control of the active power adjustment instruction.
Disclosure of Invention
The invention provides an electrochemical energy storage power station internal active control method, system and medium adaptive to a frequency modulation function, aiming at solving the technical problem that the conventional energy storage power station power control method cannot reduce the frequent and rapid switching of the charging and discharging states of an energy storage battery as far as possible.
In order to achieve the technical purpose, the technical scheme of the invention is that,
an electrochemical energy storage power station in-station active power control method adapting to a frequency modulation function comprises the following steps:
1) calculating the charging and discharging times n of each energy storage unit at the current moment t according to the duration of the zero active output of each energy storage unit of the electrochemical energy storage power station in the active output adjustment process of the energy storage power stationti(ii) a Wherein the shorter the duration of zero, ntiThe larger;
2) the electrochemical energy storage power station receives a total station frequency modulation instruction value P given by current time t schedulingAGCt；
3) According to the current time t, the active total output P of the electrochemical energy storage power stationtEach energy storage unit has active output force PtiAnd the upper limit maxP of the active output of each energy storage unittiAnd lower limit minPtiCalculating the active output variation value delta P of each energy storage unittiThe calculation formula is as follows:
3.1) if PAGCt≥0、Pt≥0，
3.2) if PAGCt＜0、Pt≥0，
3.3) if PAGCt＜0、Pt＜0，
3.4) if PAGCt≥0、Pt＜0，
4) According to each energy storage unit haveWork output variation value DeltaPtiObtaining the target value P' of the active output of each energy storage unittiThe calculation formula is as follows:
P′ti＝Pti+ΔPti
5) enabling each energy storage unit to have an active output target value PtiAnd the frequency converter, namely PCS, of each energy storage unit is sent to execute.
The active power control method in the electrochemical energy storage power station adapting to the frequency modulation function comprises the step 1) of charging and discharging times n of each energy storage unittiThe calculation principle is as follows:
1.1) time 0 Each energy storage unit n0iAre all 0;
1.2) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is more than or equal to 30min, nti＝n(t-1)i+1；
1.3) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 30min and more than or equal to 10min, nti＝n(t-1)i+2；
1.4) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is less than 10min and more than or equal to 1min, nti＝n(t-1)i+5；
1.5) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 1min and more than or equal to 10s, nti＝n(t-1)i+10；
1.6) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 10s, nti＝n(t-1)i+30；
1.7) when the ith group of energy storage units is replaced by all energy storage unitsAfter the battery is charged, n istiThe reset is 0.
The method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function comprises the step 3) of controlling the total active power P of the electrochemical energy storage power station at the current moment ttEach energy storage unit has active output force PtiThe relationship of (a) to (b) is as follows:
the electrochemical energy storage power station internal active power control method adapting to the frequency modulation function comprises the step 3) that the upper limit maxP of the active power output of each energy storage unittiAnd lower limit minPtiThe calculation formula of (a) is as follows:
in the formula, PiMFor rating the energy storage unit for active power, WtiFor the stored energy of the energy storage unit at the current time t, maxWi、minWiMaximum storable energy and minimum storable energy, maxU, respectively, of the energy storage unitti、minUtiRespectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxUi、minUiThe 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.
In the electrochemical energy storage power station active power control method adapting to the frequency modulation function, in the step 3.2), the calculation formula of f (i) is as follows:
in the formula, XtEnergy storage unit set for charging and discharging selected for current moment tAnd (6) mixing.
The electrochemical energy storage power station in-station active control method adapting to the frequency modulation function is characterized in that the energy storage unit set X for converting discharge into charge is selected at the current moment ttThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
the electrochemical energy storage power station active power control method adapting to the frequency modulation function has the following calculation formula of g (i) in the step 2.4):
in the formula, YtAnd selecting a set of energy storage units for charging to discharging at the current moment t.
The electrochemical energy storage power station in-station active control method adapting to the frequency modulation function is characterized in that the energy storage unit set Y for charging to discharging is selected at the current moment ttThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
an electrochemical energy storage power station in-plant active control system adapting to frequency modulation function comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured, and the memory stores programs for executing the steps of the electrochemical energy storage power station in-plant active control method adapting to frequency modulation function.
A computer readable storage medium having stored thereon a computer program programmed or configured to perform the method for active control in an electrochemical energy storage power station adapted to frequency modulation function.
The method has the technical effects that the frequency of charging and discharging of each energy storage unit of the electrochemical energy storage power station at the current moment is calculated, and a total-station frequency modulation instruction value is received, dispatched and issued; 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 active output upper and lower limits of each energy storage unit at the moment; and calculating to obtain the target value of the active power output of the energy storage unit, and transmitting the 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 charging and discharging states of the energy storage units as much as possible, reduces the battery aging speed 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 schematic diagram of a basic process flow of an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for controlling the active power in the electrochemical energy storage power station, which adapts to the frequency modulation function, of the embodiment includes the following steps:
1) calculating the charging and discharging times n of each energy storage unit at the current moment t according to the duration of the zero active output of each energy storage unit of the electrochemical energy storage power station in the active output adjustment process of the energy storage power stationti(ii) a Wherein the shorter the duration of zero, ntiThe larger. Specifically, the calculation principle is as follows:
1.1) time 0 Each energy storage unit n0iAre all 0;
1.2) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is more than or equal to 30min, nti＝n(t-1)i+1；
1.3) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 30min and more than or equal to 10min, nti＝n(t-1)i+2；
1.4) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is less than 10min and more than or equal to 1min, nti＝n(t-1)i+5；
1.5) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 1min and more than or equal to 10s, nti＝n(t-1)i+10；
1.6) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 10s, nti＝n(t-1)i+30；
1.7) if the ith group of energy storage units replace all energy storage batteries, then n of the replaced ith group of energy storage unitstiThen 0 is reset. However, if only part of the energy storage cells is replaced, n of the ith group of energy storage cellstjRemain unchanged.
2) The electrochemical energy storage power station receives a total station frequency modulation instruction value P given by current time t schedulingAGCt。
3) According to the current time t, the active total output P of the electrochemical energy storage power stationtEach energy storage unit has active output force PtiAnd the active output upper and lower limits maxP of each energy storage unitti、minPtiTo calculate the active output variation value delta P of each energy storage unitti。
Wherein the total active power output P of the electrochemical energy storage power station at the current moment ttEach energy storage unit has active output force PtiThe relationship of (a) to (b) is as follows:
active power output upper limit maxP of each energy storage unittiAnd lower limit minPtiThe calculation formula of (a) is as follows:
in the formula, PiMFor rating the energy storage unit for active power, WtiFor the stored energy of the energy storage unit at the current time t, maxWi、minWiMaximum storable energy and minimum storable energy, maxU, respectively, of the energy storage unitti、minUtiRespectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxUi、minUiThe 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.
Calculating DeltaP according to the parameterstiThe formula of (1) is as follows:
3.1) if PAGCt≥0、Pt≥0，
3.2) if PAGCt＜0、Pt≥0，
The formula for f (i) is as follows:
in the formula, XtAnd the energy storage unit set is selected for the current moment t and is converted into a charging energy storage unit set. XtThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
3.3) if PAGCt＜0、Pt＜0，
3.4) if PAGCt≥0、Pt＜0，
The formula for g (i) is as follows:
in the formula, YtAnd selecting a set of energy storage units for charging to discharging at the current moment t. Y istThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
4) according to the active output variation value delta P of each energy storage unittiObtaining the target value P' of the active output of each energy storage unittiThe calculation formula is as follows:
P′ti＝Pti+ΔPti。
5) enabling each energy storage unit to have an active output target value PtiAnd the control signal is transmitted to a frequency converter (PCS) of each energy storage unit for execution.
In summary, the steps of the method in this embodiment include calculating the number of times of charging and discharging each energy storage unit of the electrochemical energy storage power station at the current moment, and receiving, dispatching and issuing 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 active output upper and lower limits of each energy storage unit at the moment; and calculating to obtain the target value of the active power output of the energy storage unit, and transmitting the target value to a frequency converter (PCS) of each energy storage unit for execution. On the basis of meeting the frequency modulation requirement, the method reasonably distributes and controls the active output change value of each energy storage unit, reduces frequent and rapid switching of the charging and discharging states of the energy storage units as much as possible, reduces the battery aging speed of the electrochemical energy storage power station for frequency modulation, and prolongs the service life of the electrochemical energy storage power station.
The invention also provides an electrochemical energy storage power station in-station active control system adapting to the frequency modulation function and a computer readable storage medium according to the embodiment of the invention.
One kind adapts to the functional control system in the electrochemistry energy storage power station of frequency modulation function, including:
one or more microprocessors, the microprocessors programmed or configured;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the aforementioned methods.
In specific use, a user can execute the electrochemical energy storage power station internal active control method adapting to the frequency modulation function through the electrochemical energy storage power station internal active control system adapting to the frequency modulation function, so that the electrochemical energy storage power station active control is realized.
Similarly, the present invention provides a computer readable medium, on which a programmed or configured computer program is stored, wherein the computer program, when executed by a processor, can implement the method for controlling power in an electrochemical energy storage power station that adapts to frequency modulation function according to the embodiment of the present invention.
Claims (10)
1. An electrochemical energy storage power station in-station active power control method adapting to a frequency modulation function is characterized by comprising the following steps:
1) root of herbaceous plantCalculating the charging and discharging times n of each energy storage unit at the current moment t according to the time length of the energy storage units in the active output adjustment process of the electrochemical energy storage power station when the active output is kept zeroti(ii) a Wherein the shorter the duration of zero, ntiThe larger;
2) the electrochemical energy storage power station receives a total station frequency modulation instruction value P given by current time t schedulingAGCt；
3) According to the current time t, the active total output P of the electrochemical energy storage power stationtEach energy storage unit has active output force PtiAnd the upper limit maxP of the active output of each energy storage unittiAnd lower limit minPtiCalculating the active output variation value delta P of each energy storage unittiThe calculation formula is as follows:
3.1) if PAGCt≥0、Pt≥0，
3.2) if PAGCt<0、Pt≥0，
3.3) if PAGCt<0、Pt<0，
3.4) if PAGCt≥0、Pt<0，
4) According to the active output variation value delta P of each energy storage unittiObtaining the target value P' of the active output of each energy storage unittiThe calculation formula is as follows:
P′ti＝Pti+ΔPti
5) enabling each energy storage unit to have an active output target value PtiAnd the frequency converter, namely PCS, of each energy storage unit is sent to execute.
2. The method for controlling active power in an electrochemical energy storage power station adapting to frequency modulation function according to claim 1, wherein in step 1), the number n of charging and discharging times of each energy storage unit is ntiThe calculation principle is as follows:
1.1) time 0 Each energy storage unit n0iAre all 0;
1.2) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is more than or equal to 30min, nti＝n(t-1)i+1；
1.3) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 30min and more than or equal to 10min, nti＝n(t-1)i+2；
1.4) in the active output adjustment process of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of charging and discharging is less than 10min and more than or equal to 1min, nti＝n(t-1)i+5；
1.5) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 1min and more than or equal to 10s, nti＝n(t-1)i+10；
1.6) in the process of adjusting the active output of the energy storage power station, the i-th group of energy storage units are charged to discharged or discharged to charged, if the standing time (the active output is kept zero) of the charging and discharging is less than 10s, nti＝n(t-1)i+30；
1.7) when the ith group of energy storage units replace all energy storage batteries, n is addedtiThe reset is 0.
3. The method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function of claim 1, wherein in the step 3), the total active power output P of the electrochemical energy storage power station at the current moment t istEach energy storage unit has active output force PtiThe relationship of (a) to (b) is as follows:
4. the method for controlling the active power in an electrochemical energy storage power station adapting to the frequency modulation function of claim 1, wherein in the step 3), the upper limit of the active power output maxP of each energy storage unittiAnd lower limit minPtiThe calculation formula of (a) is as follows:
in the formula, PiMFor rating the energy storage unit for active power, WtiFor the stored energy of the energy storage unit at the current time t, maxWi、minWiMaximum storable energy and minimum storable energy, maxU, respectively, of the energy storage unitti、minUtiRespectively the highest value and the lowest value of the voltage of the single battery of the energy storage unit at the current moment t, maxUi、minUiThe 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.
5. The method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function of claim 1, wherein in the step 3.2), the calculation formula of f (i) is as follows:
in the formula, XtAnd the energy storage unit set is selected for the current moment t and is converted into a charging energy storage unit set.
6. The method for active power control in an electrochemical energy storage power station adapting to frequency modulation function of claim 5, wherein the selected energy storage unit set X for discharging to charging at the current moment t is selectedtThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
7. the method for controlling the active power in the electrochemical energy storage power station adapting to the frequency modulation function according to claim 1, wherein the calculation formula of g (i) in the step 2.4) is as follows:
in the formula, YtAnd selecting a set of energy storage units for charging to discharging at the current moment t.
8. The method of claim 7, wherein the set Y of energy storage cells selected at the current time t is charged to dischargedtThe selection principle is as follows: the sum of the charging and discharging times of the energy storage units in the set is minimum, and the energy storage units in the set can meet the requirement of active power output adjustment; the mathematical expression is:
9. an electrochemical energy storage power station in-plant active control system adapted to frequency modulation function, comprising a microprocessor and a memory connected to each other, the microprocessor being programmed or configured, the memory storing a program for performing the steps of the electrochemical energy storage power station in-plant active control method adapted to frequency modulation function according to any one of claims 1 to 8.
10. A computer readable storage medium having stored thereon a computer program programmed or configured to perform the method of active control in an electrochemical energy storage power station adapted to frequency modulation according to any one of claims 1 to 8.
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