CN114977232A - Energy storage control method and device and microgrid - Google Patents
Energy storage control method and device and microgrid 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
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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
- H02J15/00—Systems for storing electric energy
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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
- H02J3/008—Circuit arrangements for AC mains or AC distribution networks involving trading of energy or energy transmission rights
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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
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Abstract
The invention discloses an energy storage control method, an energy storage control device and a microgrid. The energy storage control method comprises the following steps: acquiring a system target demand updated in real time in a demand settlement period; calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power; and if the energy storage is not charged, taking the intermediate value of the energy storage power as the target value of the energy storage power, and repeatedly executing the step of calculating the updated target demand of the system. According to the technical scheme of the embodiment of the invention, the target demand of the system is not required to be predicted by a large amount of historical data, the energy storage system is controlled by the target demand of the system updated in real time, and the energy storage system is favorable for avoiding increasing the demand electric charge due to the addition of the energy storage system, so that the electricity utilization cost is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of power control, in particular to an energy storage control method, an energy storage control device and a microgrid.
Background
With the large-scale development of new energy sources, the combined complementation of multiple new energy sources including an energy storage system is a necessary trend, and the addition of the energy storage system may influence the control of the microgrid (user side) on the maximum power demand.
Two electricity price making mechanisms are often adopted by industrial enterprises for calculating electricity prices. The two power generation rates comprise a basic power rate and a power rate, wherein the basic power rate is a demand power rate, and the demand power rate is related to the power demand reported by the microgrid (user side) and does not change along with actual power consumption. In the prior art, when demand prediction is performed on a newly built microgrid (user side), the prediction accuracy is poor due to insufficient historical data. In addition, with the development of new energy, it is a necessary trend to add energy storage systems to the microgrid (user side), but the addition of the energy storage systems may increase the electricity demand of the microgrid (user side).
Disclosure of Invention
The invention provides an energy storage control method, an energy storage control device and a microgrid, which are used for improving the demand calculation precision and avoiding the increase of demand electricity charge caused by the addition of an energy storage system.
According to an aspect of the present invention, there is provided an energy storage control method including:
acquiring real-time updated system target demand in a demand settlement period;
calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power;
and if the stored energy is not charged, taking the intermediate value of the stored energy power as the target value of the stored energy power, and repeatedly executing the calculation step of updating the target demand of the system.
Optionally, in the case of energy storage charging, the method for calculating the energy storage power target value includes:
calculating an energy storage charging boundary according to the system target demand and the load power;
and taking the minimum value of the energy storage charging boundary and the energy storage power intermediate value as the energy storage power target value.
Optionally, when calculating the energy storage charging boundary, the method further includes:
and adjusting the energy storage charging boundary by adopting a boundary threshold value.
Optionally, the method for obtaining the system target demand updated in real time includes:
calculating the real-time load demand according to the load power;
and updating and calculating the system target demand according to the real-time load demand.
Optionally, the method for updating the system target demand in real time according to the real-time load demand includes:
and taking the maximum value of the real-time load demand and the system target demand at the last moment as the updated system target demand.
Optionally, the method for calculating the real-time load demand according to the load power includes:
integrating the load power in a demand calculation period to obtain a load integral value;
and converting the load integral value into the real-time load demand.
Optionally, when calculating the load integral value, the method further includes:
and integrating the load power in a demand calculation period by adopting a slip calculation method.
Optionally, the method for obtaining the system target demand updated in real time includes:
collecting the system target demand updated in real time by a load ammeter; wherein the system target demand is a maximum value of the load demands.
According to another aspect of the present invention, there is provided an energy storage control apparatus including:
the demand updating module is used for acquiring the system target demand updated in real time in a demand settlement period;
the energy storage and charging control module is used for calculating the load power by adopting a power service algorithm to obtain an energy storage power intermediate value; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power;
and the energy storage non-charging control module is used for taking the energy storage power intermediate value as the energy storage power target value and repeatedly executing the calculation step of updating the system target demand if the energy storage is not charged.
According to another aspect of the present invention, there is also provided a microgrid comprising: the system comprises a load system, an energy storage system and a control system; the control system executes the energy storage control method according to the first aspect.
According to the technical scheme of the embodiment of the invention, the system target demand updated in real time is obtained in the demand settlement period; calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power; and if the energy storage is not charged, taking the intermediate value of the energy storage power as the target value of the energy storage power, and repeatedly executing the step of calculating the updated target demand of the system. By the energy storage control method provided by the embodiment of the invention, the target demand of the newly built system of the energy storage power station can be calculated without a large amount of historical load data, and the demand calculation precision is improved. In addition, the embodiment of the invention controls the energy storage system according to the system target demand updated in real time, so that the system target demand of the microgrid (user side) when the energy storage system is not included is not increased when the energy storage system is added, the power consumption cost is reduced, and the hidden income is increased.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an electrical schematic diagram of a microgrid according to an embodiment of the present invention;
fig. 2 is a flowchart of an energy storage control method according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for calculating an energy storage power target value during energy storage charging in step S120 according to an embodiment of the present invention;
fig. 4 is a flowchart of another energy storage control method provided in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart of a method of calculating a real-time load demand provided in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an energy storage control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background, two electricity price making mechanisms commonly used by industrial enterprises have the following specific meanings: the electricity price is divided into a basic electricity price and an electricity degree electricity price. The basic electricity price is the basis for calculating the electricity price according to the transformer capacity or the maximum demand of the industrial enterprises. Wherein the maximum demand may be a maximum of the average load every 15 minutes or every 30 minutes of a month. The basic electricity price can be contracted by a power supply department and a microgrid (user side), the limit is determined, and a fixed electricity consumption fee is charged every month and does not change along with the actual electricity consumption. And the electricity rate is an electricity rate calculated from the actual power consumption amount of the microgrid (user side).
According to the two electricity price making mechanisms, the total electricity price of the microgrid (user side) can be calculated by the following formula:
total electricity rate is basic electricity rate (demand electricity rate) + electricity rate (actual electricity consumption rate)
The demand electric charge can be calculated by a formula, namely the demand electric charge is the unit price of the demand multiplied by the reported demand. Therefore, the demand electricity charge is affected by the reported demand of the microgrid (user side), and the more the reported demand is, the more the demand electricity charge is. The reporting mode of the power demand can comprise the following modes: one is that according to the rated capacity of the transformer, the micro-grid (user side) reports the power demand; and the other is to determine the reporting demand according to the real-time demand charging.
At present, service scenes of renting energy storage power stations are gradually increased, and original load demand electric charge is not increased after a micro-grid (user side) is expected to be added into an energy storage system. However, for a newly built microgrid (user side), due to the lack of historical load data, the accuracy of predicting the target demand is poor, and the target demand cannot be calculated in real time.
Based on the above technical problem, the embodiments of the present invention provide the following technical solutions.
In order to facilitate understanding of the energy storage control method provided by the embodiment of the invention, firstly, an electrical structure of the microgrid to which the energy storage control method is applied is explained.
Fig. 1 is an electrical schematic diagram of a microgrid according to an embodiment of the present invention. As shown in fig. 1, the microgrid (user side) includes: a load system 10, an energy storage system 20, and a control system 30. The control system 30 is configured to execute an energy storage control method according to any embodiment of the present invention, which will be explained in the following embodiments.
Illustratively, the transformer 41 is connected to a bus 50 of the grid, and a Point of Common Coupling (PCC) Point is provided on the transformer 41 and the bus 50. The load system 10 of the microgrid (user side) may include electric consumers, photovoltaic systems and other distributed energy systems, etc. Illustratively, other distributed energy systems may include wind power systems and the like. A load point 422 is provided between the transformer 41 and the load system 10, and an energy storage point 423 is provided between the transformer 41 and the energy storage system 20.
Optionally, the control system 30 includes a general controller 31 and an energy storage controller 32. Communication lines 51 are connected between the master controller 31 and the load point 422, between the master controller and the load system 10, between the master controller and the energy storage point 423, between the master controller and the energy storage system 20, and between the master controller and the energy storage controller 32. Communication lines 51 are connected between the energy storage controller 32 and the energy storage point 423 and between the energy storage system 20, and communication lines 51 are connected between the common connection point 421 and the load point 422 and between the common connection point and the load system 10. The control system 30 may output control signals to the load point 422, the load system 10, the energy storage point 423, the energy storage system 20, and the energy storage controller 32 via communication lines 51, and the control system 30 may also collect relevant data via communication lines 51.
Optionally, the microgrid (user side) structure further includes a time service server 40, and the time service server 40 is configured to perform timing in the real-time demand calculation process. The point of common connection 421, the point of load 422 and the point of energy storage 423 are provided with metering devices, for example: a metering ammeter, etc., and the metering device is used for measuring the corresponding load data of the connected equipment, etc. The metering device at the load point 422 is also used for evaluating system indexes and performing system time correction, so that the time of all the metering devices is kept consistent, and metering errors caused by time errors during metering of required quantity are avoided.
The control system 30 in the microgrid (user side) structure is used for executing the energy storage control method, so that the demand calculation precision of the newly built energy storage power station is improved, the real-time demand is used as a control basis, the energy storage system is controlled, the demand electric charge is not increased when the energy storage system is added, and the electricity utilization cost is reduced. The following embodiment will specifically describe the energy storage control method performed by the control system 30.
The embodiment of the invention provides an energy storage control method which is suitable for energy storage control of a microgrid (user side), and is particularly suitable for a newly constructed microgrid (user side). The energy storage control method can be executed by an energy storage control device, and the energy storage control device can be configured in a control system. Fig. 2 is a flowchart of an energy storage control method according to an embodiment of the present invention. As shown in fig. 2, the energy storage control method includes:
and S110, acquiring the real-time updated system target demand in the demand settlement period.
Specifically, the demand settlement period is a time period for settling the demand electricity fee, and may be, for example, one month, which is determined according to the requirement of the power supply department. The real-time updated system target demand is the maximum demand of the microgrid (user side) which changes in real time along with real-time changing load data in the microgrid (user side), and the real-time updated system target demand represents the system maximum demand of a time period from the starting point of the demand settlement period to the current real-time calculation time.
S120, calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; and if the energy storage charging is carried out, calculating the target value of the energy storage power by taking the target demand of the system at the current moment as a control target and combining the intermediate value of the energy storage power and the load power.
Specifically, the intermediate value of the energy storage power is the load power calculated in real time by using a power service algorithm, and whether the energy storage system is in a charging state or not can be judged according to the intermediate value of the energy storage power. For example, when the intermediate value of the energy storage power is greater than 0, it indicates that the energy storage system needs to be controlled to be in a charging state. And the target value of the energy storage power is the set target power value under the condition that the demand in the demand settlement period does not exceed the target demand of the system updated in real time after the energy storage system is added. When the energy storage is charged, in order to avoid increasing the target demand of the system due to the energy storage charging, the target value of the energy storage power is obtained by calculation according to the intermediate value of the energy storage power and the load power, so that the maximum demand at the current moment is not more than the target demand of the system, and the added energy storage system is prevented from increasing the target demand of the system.
And S130, if the energy storage is not charged, taking the intermediate value of the energy storage power as a target value of the energy storage power, and repeatedly executing the calculation step of updating the target demand of the system.
Specifically, the energy storage non-charging state may include states of energy storage discharging, energy storage not charging and discharging, energy storage shutdown or energy storage failure. Illustratively, when the intermediate value of the energy storage power is less than 0, the energy storage system needs to be controlled to be in a discharging state; and when the intermediate value of the energy storage power is equal to 0, controlling the energy storage system to be in an un-charging and un-discharging state. When the stored energy is not charged, the stored energy does not consume electric energy. When the stored energy is in a non-charging state, the load demand at the common connection point can be reduced, and the risk that the microgrid (user side) exceeds the load demand due to the addition of the stored energy does not exist. Therefore, the energy storage power intermediate value can be used as the energy storage power target value at the current moment, and the operation of updating the system target demand at the next moment can be repeated.
According to the technical scheme of the embodiment, the system target demand updated in real time is obtained in the demand settlement period; calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power; and if the energy storage is not charged, taking the intermediate value of the energy storage power as the target value of the energy storage power, and repeatedly executing the step of calculating the updated target demand of the system. By the energy storage control method provided by the embodiment, the system target demand of the newly built energy storage power station can be calculated without a large amount of historical load data, and the demand calculation precision is improved. In addition, the embodiment of the invention controls the energy storage system according to the system target demand updated in real time, so that the system target demand of the microgrid (user side) when the energy storage system is not included is not increased when the energy storage system is added, the power consumption cost is reduced, and the hidden income is increased.
Optionally, fig. 3 is a flowchart of a method for calculating an energy storage power target value during energy storage charging in step S120 according to an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 3, in the case of energy storage charging, the method for calculating the energy storage power target value includes:
and S1201, calculating an energy storage charging boundary according to the system target demand and the load power.
Specifically, the energy storage charging boundary is the maximum charging power that can be reached during energy storage charging. The load power can be directly measured and collected by a metering device arranged at the load point, and can also be obtained by calculating the power at the common connecting point and the active power at the energy storage point, and the load power can be calculated according to the following formula:
Pload＝Ppcc-Pbms
wherein Pload represents the load power, Ppcc represents the power of the point of common coupling, and Pbms represents the active power of the point of energy storage.
Illustratively, when calculating the energy storage charging boundary, the method further comprises adjusting the energy storage charging boundary by using a boundary threshold value. And calculating an energy storage charging boundary by using the system target demand as a control target according to the load power according to the following formula:
Pcharge_safe＝Pt-Pload+C
where Pt represents the system target demand, Pcharge _ safe represents the energy storage charge boundary, and C represents the boundary threshold. The boundary threshold value is used for improving the safety of the energy storage system, ensuring the service life of the energy storage system and preventing the over-discharge phenomenon of the energy storage system. And when the target demand of the system is larger than the load power, the energy storage system needs to be charged.
It should be noted that, in the calculation process of the energy storage power target value, the boundary threshold may be set, or the boundary threshold may not be set, and the result of the energy storage power target value is not affected.
And S1202, taking the minimum value of the energy storage charging boundary and the energy storage power intermediate value as an energy storage power target value.
Specifically, boundary calculation is performed according to the energy storage charging boundary, the energy storage charging boundary is compared with the intermediate value of the energy storage power, and a smaller value is obtained as an energy storage target power value, which can be expressed as follows by using a formula:
Ptarget＝MIN(Pt1，Pcharge_safe)
where Ptarget represents the final energy storage target power value, and Pt1 represents the energy storage power intermediate value. The smaller one of the energy storage power intermediate value and the energy storage charging boundary is selected, so that the maximum demand can be ensured not to exceed the target demand of the system, the added energy storage system does not increase the demand electric charge, and the implicit income is increased.
Optionally, fig. 4 is a flowchart of another energy storage control method provided in the embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 4, the method for obtaining the system target demand updated in real time includes:
and S111, calculating the real-time load demand according to the load power.
Specifically, the real-time meeting demand is calculated by collecting the load power in a demand period in real time and combining the time of the demand period.
And S112, updating and calculating the system target demand according to the real-time load demand.
For example, the maximum value between the real-time load demand and the last system target demand may be used as the updated system target demand. Specifically, the maximum demand from the start point of the demand settlement period to the current time is calculated in real time, and a larger one of the maximum demand calculated at the previous time and the real-time load demand can be selected as the maximum demand of the current time calculated in real time, and the maximum demand is the system target demand. The above calculation process can be expressed by the following numerical relationships:
Pt’＝MAX(Pt，Pcurr)
wherein, Pt' represents the maximum demand of the current moment, and Pt represents the maximum demand calculated at the last moment. The real-time update of the system target demand can be realized through the calculation method.
Optionally, fig. 5 is a flowchart of a method for calculating a real-time load demand according to an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 5, the method for calculating the real-time load demand according to the load power includes:
and S1111, integrating the load power in a demand calculation period to obtain a load integral value.
S1112 converts the load integral value into a real-time load demand.
Specifically, the integral of the load power within a demand period is calculated in real time, for example: the demand period can be 15 minutes, namely the load electric quantity within 15 minutes. The load capacity of 15 minutes is multiplied by a conversion coefficient which can convert the load capacity in minutes into the load capacity in hours, so that the real-time load demand is calculated. The above calculation process can be expressed by the following formula:
Pcurr＝(P1+P2+P3+…+Pk)×T×a
where, Pcurr denotes a real-time load demand, and a denotes a coefficient for converting a load electric quantity in minutes into a load electric quantity in hours. Illustratively, the a-factor is 0.25h when the demand period is 15 minutes. P1, P2, …, Pk represent the load power per unit time in 15 minutes, for example: the unit time may be 1 minute. T represents 15 minutes and is in hours.
Illustratively, when calculating the load integral value, the method further comprises integrating the load power in the demand calculation period by adopting a slip calculation method. And acquiring the load power in real time to obtain the load power per minute in a demand calculation period, wherein the demand calculation period is a demand period, and is generally 15 minutes. After the load power of the 16 th minute is collected, the load power in the demand calculation time period is the load power of the 2 nd minute to the 16 th minute; similarly, after the load power of the 17 th minute is collected, the load power in the demand calculation period is the load power of the 3 rd minute to the 17 th minute. And sequentially calculating backwards in a sliding manner to obtain the load power changing in real time in the demand calculation period, and integrating the load power to obtain a real-time load integral value. The real-time load demand is obtained by calculating the load integral value in real time, and the calculation accuracy is improved.
The real-time update of the system target demand can be obtained by adopting the calculation method, and can also be obtained by directly measuring and collecting through a metering device. The following example will illustrate the measurement of real-time system target demand using a metering device.
Optionally, on the basis of the foregoing embodiment, the method for obtaining the system target demand updated in real time includes:
collecting real-time updated system target demand by a load ammeter; wherein the system target demand is the maximum of the load demands.
Specifically, because the metering device of the load electric meter is arranged at the load point, the load electric meter can acquire the maximum value in the load demand in real time as the system target demand updated in real time. However, the load meter may also perform the demand calculation for the amount of electricity in a demand period, rather than calculating the demand in real time in a demand period. Therefore, a certain demand error may exist in the calculation according to the system target demand collected by the load electric meter, and the accuracy is poor.
The embodiment of the invention also provides an energy storage control device. Fig. 6 is a schematic structural diagram of an energy storage control device according to an embodiment of the present invention. As shown in the figure, the energy storage control device comprises:
a demand updating module 100, configured to obtain a system target demand updated in real time in a demand settlement period;
the energy storage and charging control module 200 is used for calculating the load power by adopting a power service algorithm to obtain an energy storage power intermediate value; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power;
and the energy storage non-charging control module 300 is configured to, if the energy storage is not charged, take the intermediate value of the energy storage power as the target value of the energy storage power, and repeatedly perform the step of calculating the updated target system demand.
The energy storage control device provided by the embodiment of the invention can execute the energy storage control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Optionally, on the basis of the foregoing embodiment, the energy storage and charging control module 200 includes:
the boundary calculation unit is used for calculating an energy storage charging boundary according to the system target demand and the load power;
and the power target value calculation unit is used for taking the minimum value of the energy storage charging boundary and the energy storage power intermediate value as the energy storage power target value.
Optionally, on the basis of the foregoing embodiment, the charging boundary calculating unit includes:
and the boundary adjusting subunit is used for adjusting the energy storage charging boundary by adopting a boundary threshold value.
Optionally, on the basis of the foregoing embodiment, the demand update module 100 includes:
the load demand updating unit is used for calculating the real-time load demand according to the load power;
and the target demand updating unit is used for updating and calculating the target demand of the system according to the real-time load demand.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An energy storage control method, comprising:
acquiring real-time updated system target demand in a demand settlement period;
calculating the load power by adopting a power service algorithm to obtain an intermediate value of the energy storage power; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power;
and if the stored energy is not charged, taking the intermediate value of the stored energy power as the target value of the stored energy power, and repeatedly executing the calculation step of updating the target demand of the system.
2. The energy storage control method according to claim 1, wherein in the case of energy storage charging, the method of calculating the energy storage power target value comprises:
calculating an energy storage charging boundary according to the system target demand and the load power;
and taking the minimum value of the energy storage charging boundary and the energy storage power intermediate value as the energy storage power target value.
3. The energy storage control method according to claim 2, further comprising, when calculating the energy storage charging boundary:
and adjusting the energy storage charging boundary by adopting a boundary threshold value.
4. The energy storage control method according to claim 1, wherein the method of obtaining the real-time updated system target demand comprises:
calculating the real-time load demand according to the load power;
and updating and calculating the system target demand according to the real-time load demand.
5. The energy storage control method according to claim 4, wherein the method for updating the system target demand in real time according to the real-time load demand comprises:
and taking the maximum value of the real-time load demand and the system target demand at the last moment as the updated system target demand.
6. The energy storage control method according to claim 4, wherein the method of calculating the real-time load demand from the load power comprises:
integrating the load power in a demand calculation period to obtain a load integral value;
and converting the load integral value into the real-time load demand.
7. The energy storage control method according to claim 6, characterized by, at the time of calculating the load integral value, further comprising:
and integrating the load power in a demand calculation period by adopting a slip calculation method.
8. The energy storage control method according to claim 1, wherein the method of obtaining the real-time updated system target demand comprises:
collecting the system target demand updated in real time by a load ammeter; wherein the system target demand is a maximum value of the load demands.
9. An energy storage control device, comprising:
the demand updating module is used for acquiring the system target demand updated in real time in a demand settlement period;
the energy storage and charging control module is used for calculating the load power by adopting a power service algorithm to obtain an energy storage power intermediate value; if the energy storage charging is carried out, calculating an energy storage power target value by taking the system target demand at the current moment as a control target and combining the energy storage power intermediate value and the load power;
and the energy storage non-charging control module is used for taking the energy storage power intermediate value as the energy storage power target value and repeatedly executing the calculation step of updating the system target demand if the energy storage is not charged.
10. A microgrid, comprising: the system comprises a load system, an energy storage system and a control system; the control system executes the energy storage control method according to any one of claims 1 to 8.
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| CN118589551A (en) * | 2024-07-31 | 2024-09-03 | 深圳库博能源股份有限公司 | A PLC-based energy storage demand prediction and coordination control method and system |
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| CN118589551B (en) * | 2024-07-31 | 2024-11-22 | 深圳库博能源股份有限公司 | A PLC-based energy storage demand prediction and coordination control method and system |
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