CN110880776B - Method and device for controlling charging and discharging of energy storage equipment in energy storage system - Google Patents
Method and device for controlling charging and discharging of energy storage equipment in energy storage system Download PDFInfo
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- H—ELECTRICITY
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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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Abstract
The invention relates to a method and a device for controlling charging and discharging of energy storage equipment in an energy storage system. A method for controlling charging and discharging of an energy storage device in an energy storage system comprises the following steps: acquiring a current load value of the energy storage system and a minimum peak value after peak clipping every month; determining the power utilization period of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section; determining a charge-discharge mode of the energy storage device based on the electricity utilization period and the period electricity price; and controlling the energy storage equipment to charge or discharge according to the charging and discharging mode. The embodiment can meet the requirement for peak clipping of the energy storage system, is favorable for reducing the electricity consumption cost of the energy storage system, and further improves the operation benefit of the energy storage system.
Description
Technical Field
The invention relates to the technical field of power system operation analysis, in particular to a method and a device for controlling charging and discharging of energy storage equipment in an energy storage system.
Background
At present, the load in the power system presents the characteristic of obvious peak-valley difference, the installed capacity is increased by simply depending on the expansion of investment scale, or the upgrading and capacity expansion are carried out on the power transmission and distribution line, the consumption is huge, and the electricity consumption cost can be increased. The national improvement committee issues a 'notification about the completion of basic electricity price execution modes of two electricity price users', and combines the basic electricity price corresponding to a capacity or load peak value with the electricity price corresponding to actual electricity consumption to determine the electricity price so as to regulate and control electricity consumption in a peak period, encourage electricity consumption in a low ebb period and improve the load characteristics of a system.
Along with the popularization of two system prices of electricity and the energy storage cost reduction, more users will purchase energy storage equipment and carry out commercial operation, can reduce fixed price of electricity cost through cutting down self load peak value on the one hand, and on the other hand obtains energy storage operation income through peak valley price of electricity. However, the energy storage charging and discharging mode under the condition is closely related to specific load characteristics, peak-valley electricity price time periods and numerical values, so that the overall profit of the energy storage system must fully consider the annual load time sequence characteristics of industrial user loads and the charging and discharging strategy of the energy storage system.
Disclosure of Invention
The invention provides a method and a device for controlling charging and discharging of energy storage equipment in an energy storage system, which aim to overcome the defects of the related technology.
According to a first aspect of the embodiments of the present invention, there is provided a method for controlling charging and discharging of an energy storage device in an energy storage system, including
Acquiring a current load value of the energy storage system and a minimum peak value after peak clipping every month;
determining the power utilization period of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section;
determining a charge-discharge mode of the energy storage device based on the electricity utilization period and the period electricity price;
and controlling the energy storage equipment to charge or discharge according to the charging and discharging mode.
Optionally, the determining, based on the current load value, the electricity utilization period to which the energy storage system belongs includes:
acquiring a load maximum value and a load minimum value in a natural day to which the current moment belongs;
calculating a load maximum distance according to the current load value and the load maximum value, and calculating a load minimum distance according to the current load value and the load minimum value;
if the distance of the maximum load value is smaller than or equal to the distance of the minimum load value, determining the electricity utilization period of the energy storage system at the current moment as a wave crest period; and if the distance of the maximum load is greater than the distance of the minimum load, determining that the electricity utilization period of the energy storage system at the current moment is a trough period.
Optionally, the determining the charge-discharge mode of the energy storage device based on the electricity utilization period and the period electricity price comprises:
if the electricity consumption time interval is a wave crest interval and the electricity consumption time interval adopts the low valley electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 1;
if the electricity consumption time interval is a wave crest segment and the electricity consumption time interval adopts a flat segment electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 2;
if the electricity consumption time interval is a wave crest interval and the peak electricity price is adopted in the electricity consumption time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 3;
if the electricity utilization time interval is a trough time interval and the electricity utilization time interval adopts the low-trough electricity price, determining that the charging and discharging mode of the energy storage device is a mode 4;
if the power consumption time interval is a trough section and the power consumption time interval adopts a flat section of power price, determining that the charging and discharging mode of the energy storage device is a mode 5;
and if the electricity utilization time interval is a trough time interval and the peak electricity price is adopted in the electricity utilization time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 6.
Optionally, if the charge-discharge mode is the mode 1, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 1-1, otherwise, switching to a mode 1-2; the minimum peak value after the peak clipping every month is the difference value between the maximum load value every month and the maximum discharge power of the energy storage equipment;
Lpeak＝maxLmonth-Pdisch
in the formula, LpeakmaxL, the minimum peak after peak clipping every monthmonthAt a monthly load maximum, PdischThe maximum discharge power of the energy storage equipment;
in the mode 1-1, when the current load value is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge, otherwise, controlling the energy storage equipment to charge;
wherein, each section of discharge electric quantity is as follows:
if the energy storage equipment is not fully discharged, calculating the fully discharged L in the discharge section by adopting a dichotomy methodpeak(ii) a Or if the energy storage equipment is not fully charged enough, backtracking the energy storage equipment section by section according to a preset backtracking method, and revising the process;
in the mode 1-2, when each load in the energy storage system is smaller than the minimum peak value after peak clipping every month, the energy storage equipment is controlled to be charged, and the charging energy is selected by considering load curve and charge state constraint at the same time
The charging capacity of the energy storage device comprises:
if the charge state is not considered, the charge electric quantity is the area of a closed region corresponding to a load curve between the current moment and the charge-discharge transition time point; or,
if the state of charge is considered, the charging capacity is
To take into account the charge capacity of the load curve area,
Snfor energy storage battery rating, SOCmaxThe maximum state of charge of the battery is obtained, and the SOC is the current state of charge.
Optionally, if the charge-discharge mode is the mode 2, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 2-1, otherwise, switching to the mode 2-2;
in the mode 2-1, if the load is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge;
and under the mode 2-1, if the load does not exceed the peak value after peak clipping, controlling the energy storage equipment not to be charged or discharged.
Optionally, if the charge-discharge mode is the mode 3, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 3-1, otherwise, switching to a mode 3-2;
in the mode 3-1, if the existing energy in the energy storage equipment does not meet the peak clipping requirement, the energy storage equipment is controlled to discharge by adopting a backtracking method; if the energy in the energy storage equipment meets the peak clipping requirement, controlling the energy storage equipment to discharge;
in mode 3-2, the energy storage device is controlled to perform maximum power discharge.
Optionally, if the charge-discharge mode is the mode 4, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
controlling the energy storage equipment to be charged in the whole process; charging energySelecting by considering load curve and charge state constraint
Optionally, if the charge-discharge mode is the mode 4, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
optionally, if the charge-discharge mode is the mode 5, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: and controlling the energy storage device not to be charged or discharged.
Optionally, if the charge-discharge mode is the mode 6, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: and controlling the energy storage device to discharge at the maximum power.
According to a second aspect of the embodiments of the present invention, there is provided an apparatus for controlling charging and discharging of an energy storage device in an energy storage system, including
The load acquisition module is used for acquiring the current load value of the energy storage system and the minimum peak value after peak clipping every month;
the time interval acquisition module is used for determining the electricity utilization time interval of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section;
the mode acquisition module is used for determining a charge and discharge mode of the energy storage equipment based on the electricity utilization time interval and the time interval electricity price;
and the charging and discharging control module is used for controlling the energy storage equipment to charge or discharge according to the charging and discharging mode.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
according to the embodiment, the current load value of the energy storage system and the minimum peak value after peak clipping every month are obtained; then, determining an electricity utilization period of the energy storage system based on the current load value, wherein the electricity utilization period comprises a peak segment and a trough segment; then, determining a charge-discharge mode of the energy storage device based on the electricity utilization time period and the time period electricity price; and finally, controlling the energy storage equipment to charge or discharge according to the charging and discharging mode, so as to meet the requirement of peak clipping on the energy storage system, thus being beneficial to reducing the power consumption cost of the energy storage system and further improving the operation benefit of the energy storage system.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart illustrating a method of controlling charging and discharging of an energy storage device in an energy storage system according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating a load curve according to an exemplary embodiment.
FIG. 3 is a flow diagram illustrating updating the minimum peak after peak clipping per month according to an exemplary embodiment.
FIG. 4 is a flowchart illustrating a discharge trace back according to an example embodiment.
Fig. 5 is a block diagram illustrating an apparatus for controlling charging and discharging of an energy storage device in an energy storage system according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of devices consistent with certain aspects of the invention, as detailed in the appended claims.
At present, the load in the power system presents the characteristic of obvious peak-valley difference, the installed capacity is increased by simply depending on the expansion of investment scale, or the upgrading and capacity expansion are carried out on the power transmission and distribution line, the consumption is huge, and the electricity consumption cost can be increased. The national improvement committee issues a 'notification about the completion of basic electricity price execution modes of two electricity price users', and combines the basic electricity price corresponding to a capacity or load peak value with the electricity price corresponding to actual electricity consumption to determine the electricity price so as to regulate and control electricity consumption in a peak period, encourage electricity consumption in a low ebb period and improve the load characteristics of a system.
Along with the popularization of two system prices of electricity and the energy storage cost reduction, more users will purchase energy storage equipment and carry out commercial operation, can reduce fixed price of electricity cost through cutting down self load peak value on the one hand, and on the other hand obtains energy storage operation income through peak valley price of electricity. However, the energy storage charging and discharging mode under the condition is closely related to specific load characteristics, peak-valley electricity price time periods and numerical values, so that the overall profit of the energy storage system must fully consider the annual load time sequence characteristics of industrial user loads and the charging and discharging strategy of the energy storage system.
In order to solve the above problem, this embodiment provides a method for controlling charging and discharging of an energy storage device in an energy storage system, which may be applied to a processor of the energy storage device or a central controller in the energy storage system, and fig. 1 is a flowchart illustrating a method for controlling charging and discharging of an energy storage device in an energy storage system according to an exemplary embodiment. Referring to fig. 1, a method for controlling charging and discharging of energy storage equipment in an energy storage system includes steps 101 to 104, wherein:
in step 101, the current load value of the energy storage system and the minimum peak value after peak clipping every month are obtained.
In this embodiment, the historical load value of the energy storage system in a set period is obtained, in an example, the set period may be one (natural) day, so that the maximum load value and the minimum load value in one day may be obtained. And selecting the load value at a certain time point from the day as the current load value of the energy storage system.
Considering that the two current maximum demand electricity rates are calculated according to the month, in this embodiment, the minimum peak value after peak clipping per month is also calculated in a month period, and the minimum peak value after peak clipping per month of the load is also calculated in a month period when the energy storage profit is calculated, as shown in formula (2):
Lpeak＝maxLmonth-Pdisch (2)
in the formula (2), LpeakmaxL, the minimum peak after peak clipping every monthmonthAt a monthly load maximum, PdischThe maximum discharge power of the energy storage device.
It should be noted that, if the actual load characteristic in the energy storage system is high in peak load and dense, the energy storage peak clipping capability is reduced, so that the actual peak load after peak clipping is reduced, and the subsequent embodiment performs iterative correction on the calculation process.
In step 102, determining the electricity utilization period of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section.
In this embodiment, the distances between the current load value and the maximum and minimum load values may be calculated according to the current load value, the maximum load value, and the minimum load value, as shown in equation (1):
in the formula (1), L (t) is the load value at the t-th time (i.e. the current load value), LdayLoad value sets of all time points in a day, maxL is a load maximum value, minL is a load minimum value, dpeak(t) is the distance from l (t) to the maximum load, dvalley(t) is the distance to the load minimum from l (t).
In this embodiment, the current load value may be divided into a peak segment or a trough segment, and the criterion is as follows:
1) if d ispeak(t) is less than or equal to dvalley(t), determining to divide the current load value l (t) into wave peak sections;
2) if d ispeak(t) is greater than dvalley(t), it is determined to divide the current load value l (t) into valley segments.
In step 103, a charge and discharge mode of the energy storage device is determined based on the electricity utilization period and the period price.
In this embodiment, the time-interval electricity prices may be acquired in advance, wherein the time-interval electricity prices include a trough electricity price, a flat-interval electricity price, and a peak electricity price. The time-interval electricity price can be obtained according to a power supply company of the region where the energy storage system is located.
In this embodiment, the charging and discharging mode of the energy storage device may be determined according to the power consumption time period and the time period power price to which the current load value belongs, as shown in table 1.
TABLE 1
| Off-peak electricity price | Flat section electricity price | Peak electricity price | |
| Load peak band | Mode 1 | Mode 2 | Mode 3 |
| Load wave trough section | Mode 4 | Mode 5 | Mode 6 |
In step 104, the energy storage device is controlled to charge or discharge according to the charging and discharging mode.
Mode 1: if there is at least one load greater than LpeakThen, transition is made to mode 1-1; otherwise, modes 1-2.
Mode 1-1: in this mode, the load is greater than LpeakIs discharged while in othersCharging in a time period.
Referring to FIG. 2, in the load curve (shown by the thick solid line), the load in the D-E-F-G-H section is greater than LpeakTherefore, the energy storage equipment is controlled to perform discharge peak clipping in the period; and the A-B-C-D section and the H-I-J-K section control the energy storage device to perform valley charging in the period.
Since the charge-discharge transition time points ts and te corresponding to the D point and the H point are not known time points, it is necessary to calculate by interpolation:
in the formulae (3) and (4), t1～t7At different time points, L, as shown in FIG. 21～L7Load values are mapped for different time points.
In this embodiment, the charging energy per segment is calculated for the complete time (one day) in the mode 1-1:
if the state of charge is not considered, the ideal charging capacity is the area of a plane closed area enclosed by the continuous curve shown in fig. 2, taking a-B-C-D as an example, the charging energy is:
in the formula,
to take into account the charge capacity of the load curve area,
the maximum charging power of the stored energy is min, which represents the maximum charging power constraint of the stored energy to be considered during charging.
If state of charge is considered, the charging energy considering the state of charge constraint is:
in the formula, SnFor energy storage battery rating, SOCmaxThe maximum state of charge of the battery is obtained, and the SOC is the current state of charge.
The load curve and the charge state are comprehensively considered, and the actual charging energy of each section is as follows:
in this embodiment, each section of discharge electric quantity is calculated:
a tracing mechanism: when the discharge electric quantity does not meet the peak clipping requirement:
1) calculating the full-discharge insufficient discharge, and calculating the full-discharge sufficient discharge L in the discharge section if the full-discharge insufficient dischargepeakThe specific flow is shown in fig. 3.
Referring to fig. 3, first, the new peak value after feasible peak clipping is set to maxllmomth, and the new peak value after infeasible peak clipping is set to Lpeak. And then calculating a new peak value after tentative peak clipping by adopting a dichotomy method, and calculating the peak clipping electric quantity to be detected of the new peak value after tentative peak clipping by using an electric quantity integration method. And if the full electric quantity of the energy storage equipment is larger than the electric quantity to be subjected to peak clipping and larger than the electric quantity to be subjected to peak clipping. If not, the new peak value after the peak clipping is updated by the new peak value after the tentative peak clipping, and the new peak value after the tentative peak clipping is calculated by the dichotomy again. If yes, then try to find out whether the new peak after peak clipping and the previous convergence? If not, the new peak value after the peak clipping is updated by the new peak value after the tentative peak clipping, and the new peak value after the tentative peak clipping is calculated by the dichotomy again. If yes, outputting a result, and taking the new result as the minimum peak value after peak clipping every month.
2) If the full power is discharged enough, the process is revised by tracing back segment by segment, and the specific flow is shown in fig. 4.
Referring to fig. 4, it is determined whether the current period is the first time period of the day. If so, marking the backtracking failure, and ending the process after the dichotomy recalculates the peak value after peak clipping. If not, backtracking the previous time interval, wherein the previous time interval can comprise three states:
in the first state, the charging state, the maximum charging amount is calculated, and whether the peak clipping requirement is met (the current electric quantity of the energy storage device) is judged. If not, judging whether the energy storage equipment is fully charged, marking that the backtracking fails when the energy storage equipment is fully charged, finishing the process after recalculating the peak value after peak clipping by a bisection method, modifying the charging state of the current backtracking time period according to the maximum chargeable quantity when the energy storage equipment is not fully charged, modifying the electric quantity to be peak clipping at the current peak clipping time period, and returning to the step of judging whether the current time period is the first time period in the day again.
And in the second state, if the battery is not charged or discharged, calculating the maximum charge amount, and judging whether the peak clipping requirement is met or not (the current electric quantity of the energy storage equipment). If not, judging whether the energy storage equipment is fully charged, marking that the backtracking fails when the energy storage equipment is fully charged, finishing the process after recalculating the peak value after peak clipping by a bisection method, modifying the charging state of the current backtracking time period according to the maximum chargeable quantity when the energy storage equipment is not fully charged, modifying the electric quantity to be peak clipping at the current peak clipping time period, and returning to the step of judging whether the current time period is the first time period in the day again.
And a third state, namely a discharging state, judging whether peak clipping exists, if so, merging the two peak clipping requirements, returning to judge whether the section is the first time period in the day again, and if not, calculating whether the discharging electric quantity meets the peak clipping requirement. When the peak clipping requirement is not met, modifying the charging state of the current backtracking time interval according to the maximum chargeable quantity, and returning to judge whether the current time interval is the first time interval in the day or not after modifying the electric quantity to be subjected to peak clipping in the current peak clipping time interval; and when the peak clipping requirement is met, modifying the discharge state in the current backtracking period according to the peak clipping requirement, and finishing the process after modifying the electric quantity to be subjected to peak clipping in the current peak clipping period.
It should be noted that there is a special case in the backtracking mechanism that the peak clipping requirement cannot be met even if the energy storage device is in a full power state due to the superposition of peak clipping amounts in multiple time periods, and at this time, a new peak value meeting the peak clipping requirement needs to be recalculated by using the bisection method.
Modes 1 to 2: in the mode, the existing loads are all less than LpeakTherefore, the energy storage equipment is controlled to be charged in the whole process, and finally, the charging energy is selected by simultaneously considering the load curve and the charge state constraint
Mode 2: in this mode, if the load is greater than LpeakIt is switched to mode 2-1, otherwise to mode 2-2.
Mode 2-1: in this mode, if there is a load greater than LpeakAnd controlling the energy storage equipment to discharge and peak clipping only, wherein the steps are the same as those of the discharging section in the mode 1-1.
Mode 2-2: and if the peak value after peak clipping is not exceeded, controlling the energy storage equipment not to be charged or discharged.
Mode 3: in this mode, if the load is greater than LpeakIt is switched to mode 2-1, otherwise to mode 2-2.
Mode 3-1: in this mode, the energy storage device is first controlled to discharge to ensure peak clipping. If the existing energy in the energy storage equipment does not meet the peak clipping requirement, performing discharge tracing in the same mode 1-1; and if the existing energy meets the peak clipping requirement, controlling the energy storage equipment to discharge.
According to the discharge power constraint, the discharge energy is:
in the formula (8), the reaction mixture is,
is the stored energy maximum discharge power.
The discharge energy, as constrained by the state of charge, is:
in the formula (9), SOCminIs the minimum state of charge of the battery.
Mode 3-2: and controlling the energy storage equipment to discharge at the maximum power, wherein the discharge energy meets the formula (10).
Mode 4: controlling the energy storage equipment to charge in the whole process, and selecting the final charging energy by considering the load curve and the charge state constraint
Mode 5: and controlling the energy storage device not to be charged or discharged.
Mode 6: and controlling the energy storage equipment to discharge at the maximum power, wherein the discharge energy meets the formula (10).
In this embodiment, it is proposed to divide the charging and discharging modes according to the load peak-valley type and the electricity price peak-valley period, and then further calculate a detailed charging and discharging strategy based on each charging and discharging mode, including the charging and discharging start-stop time, the charging and discharging energy, the corresponding charge state, and the like. Particularly aiming at the reduction effect of the stored energy on the basic electricity price in the binary electricity price, considering that the intensive load peak value can influence the peak value after peak clipping, a correction method of a dichotomy iteration and backtracking mechanism is provided; meanwhile, aiming at the peak value after peak clipping, the power is constrained not to exceed the limit in the charging process. Like this, be favorable to reducing energy storage system's power consumption cost among the embodiment, further promote energy storage system's operation benefit.
An embodiment of the present invention further provides an apparatus for controlling charging and discharging of an energy storage device in an energy storage system, and fig. 5 is a block diagram illustrating an apparatus for controlling charging and discharging of an energy storage device in an energy storage system according to an exemplary embodiment. Referring to fig. 5, an apparatus for controlling charging and discharging of an energy storage device in an energy storage system includes:
the load obtaining module 501 is configured to obtain a current load value of the energy storage system and a minimum peak value after peak clipping every month;
a time period obtaining module 502, configured to determine, based on the current load value, a power consumption time period to which the energy storage system belongs; the electricity utilization period comprises a wave crest section and a wave trough section;
a mode obtaining module 503, configured to determine a charging and discharging mode of the energy storage device based on the power consumption time interval and the time interval power price;
and the charge and discharge control module 504 is configured to control the energy storage device to charge or discharge according to the charge and discharge mode.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (3)
1. A method for controlling charging and discharging of energy storage equipment in an energy storage system is characterized by comprising the following steps:
acquiring a current load value of the energy storage system and a minimum peak value after peak clipping every month;
determining the power utilization period of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section;
determining a charge-discharge mode of the energy storage device based on the electricity utilization period and the period electricity price;
controlling the energy storage equipment to charge or discharge according to the charging and discharging mode;
determining a charge-discharge mode of the energy storage device based on the electricity usage period and the period price of electricity includes:
if the electricity consumption time interval is a wave crest interval and the electricity consumption time interval adopts the low valley electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 1;
if the electricity consumption time interval is a wave crest segment and the electricity consumption time interval adopts a flat segment electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 2;
if the electricity consumption time interval is a wave crest interval and the peak electricity price is adopted in the electricity consumption time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 3;
if the electricity utilization time interval is a trough time interval and the electricity utilization time interval adopts the low-trough electricity price, determining that the charging and discharging mode of the energy storage device is a mode 4;
if the power consumption time interval is a trough section and the power consumption time interval adopts a flat section of power price, determining that the charging and discharging mode of the energy storage device is a mode 5;
if the electricity utilization time interval is a trough section and the peak electricity price is adopted in the electricity utilization time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 6;
if the charge-discharge mode is the mode 1, the controlling the energy storage device to charge or discharge according to the charge-discharge mode comprises:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 1-1, otherwise, switching to a mode 1-2; the minimum peak value after the peak clipping every month is the difference value between the maximum load value every month and the maximum discharge power of the energy storage equipment;
Lpeak＝max Lmonth-Pdisch
in the formula, LpeakmaxL, the minimum peak after peak clipping every monthmonthAt a monthly load maximum, PdischThe maximum discharge power of the energy storage equipment;
in the mode 1-1, when the current load value is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge, otherwise, controlling the energy storage equipment to charge;
wherein, each section of discharge electric quantity is as follows:
if the energy storage equipment is not fully discharged, calculating the corresponding L when the energy storage equipment is fully discharged in the discharge section by adopting a dichotomy methodpeak(ii) a Or if the energy storage equipment is not fully charged enough, backtracking the energy storage equipment section by section according to a preset backtracking method, and revising the process;
in the mode 1-2, when each load in the energy storage system is smaller than the minimum peak value after peak clipping every month, the energy storage equipment is controlled to be charged, and the charging energy is selected by considering load curve and charge state constraint at the same time
To take into account the charge capacity of the load curve area,
Snfor energy storage battery rating, SOCmaxThe maximum charge state of the battery is obtained, and the SOC is the current charge state;
if the charge-discharge mode is the mode 2, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 2-1, otherwise, switching to the mode 2-2;
in the mode 2-1, if the load is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge;
in the mode 2-1, if the load does not exceed the peak value after peak clipping, the energy storage equipment is controlled not to be charged or discharged;
if the charge-discharge mode is the mode 3, the controlling the energy storage device to charge or discharge according to the charge-discharge mode comprises:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 3-1, otherwise, switching to a mode 3-2;
in the mode 3-1, if the existing energy in the energy storage equipment does not meet the peak clipping requirement, the energy storage equipment is controlled to discharge by adopting a backtracking method; if the energy in the energy storage equipment meets the peak clipping requirement, controlling the energy storage equipment to discharge;
in the mode 3-2, controlling the energy storage equipment to discharge the maximum power;
if the charge-discharge mode is the mode 4, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
controlling the energy storage equipment to be charged in the whole process; the charging energy is selected by considering the load curve and the charge state constraint simultaneously
Wherein,
to take into account the charge capacity of the load curve area,
charging energy being state-of-charge bound, SchActual charging energy for each segment;
if the charge-discharge mode is the mode 5, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: controlling the energy storage equipment not to be charged or discharged;
if the charge-discharge mode is the mode 6, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: and controlling the energy storage device to discharge at the maximum power.
2. The method of claim 1, wherein the determining the energy storage system for the electricity usage period based on the current load value comprises:
acquiring a load maximum value and a load minimum value in a natural day to which the current moment belongs;
calculating a load maximum distance according to the current load value and the load maximum value, and calculating a load minimum distance according to the current load value and the load minimum value;
if the distance of the maximum load value is smaller than or equal to the distance of the minimum load value, determining the electricity utilization period of the energy storage system at the current moment as a wave crest period; and if the distance of the maximum load is greater than the distance of the minimum load, determining that the electricity utilization period of the energy storage system at the current moment is a trough period.
3. A device for controlling charging and discharging of energy storage equipment in an energy storage system is characterized by comprising
The load acquisition module is used for acquiring the current load value of the energy storage system and the minimum peak value after peak clipping every month;
the time interval acquisition module is used for determining the electricity utilization time interval of the energy storage system based on the current load value; the electricity utilization period comprises a wave crest section and a wave trough section;
the mode acquisition module is used for determining a charge and discharge mode of the energy storage equipment based on the electricity utilization time interval and the time interval electricity price;
the charging and discharging control module is used for controlling the energy storage equipment to charge or discharge according to the charging and discharging mode;
the charging and discharging control module is used for controlling the energy storage device to charge or discharge according to the charging and discharging mode, and specifically comprises:
if the electricity consumption time interval is a wave crest interval and the electricity consumption time interval adopts the low valley electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 1;
if the electricity consumption time interval is a wave crest segment and the electricity consumption time interval adopts a flat segment electricity price, determining that the charge-discharge mode of the energy storage equipment is a mode 2;
if the electricity consumption time interval is a wave crest interval and the peak electricity price is adopted in the electricity consumption time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 3;
if the electricity utilization time interval is a trough time interval and the electricity utilization time interval adopts the low-trough electricity price, determining that the charging and discharging mode of the energy storage device is a mode 4;
if the power consumption time interval is a trough section and the power consumption time interval adopts a flat section of power price, determining that the charging and discharging mode of the energy storage device is a mode 5;
if the electricity utilization time interval is a trough section and the peak electricity price is adopted in the electricity utilization time interval, determining that the charge-discharge mode of the energy storage equipment is a mode 6;
if the charge-discharge mode is the mode 1, the controlling the energy storage device to charge or discharge according to the charge-discharge mode comprises:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 1-1, otherwise, switching to a mode 1-2; the minimum peak value after the peak clipping every month is the difference value between the maximum load value every month and the maximum discharge power of the energy storage equipment;
Lpeak＝maxLmonth-Pdisch
in the formula, LpeakmaxL, the minimum peak after peak clipping every monthmonthAt a monthly load maximum, PdischThe maximum discharge power of the energy storage equipment;
in the mode 1-1, when the current load value is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge, otherwise, controlling the energy storage equipment to charge;
wherein, each section of discharge electric quantity is as follows:
if the energy storage equipment is not fully discharged, calculating the corresponding L when the energy storage equipment is fully discharged in the discharge section by adopting a dichotomy methodpeak(ii) a Or if the energy storage equipment is not fully charged enough, backtracking the energy storage equipment section by section according to a preset backtracking method, and revising the process;
in the mode 1-2, when each load in the energy storage system is smaller than the minimum peak value after peak clipping every month, the energy storage equipment is controlled to be charged, and the charging energy is selected by considering load curve and charge state constraint at the same time
To take into account the charge capacity of the load curve area,
Snfor energy storage battery rating, SOCmaxThe maximum charge state of the battery is obtained, and the SOC is the current charge state;
if the charge-discharge mode is the mode 2, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 2-1, otherwise, switching to the mode 2-2;
in the mode 2-1, if the load is larger than the minimum peak value after peak clipping every month, controlling the energy storage equipment to discharge;
in the mode 2-1, if the load does not exceed the peak value after peak clipping, the energy storage equipment is controlled not to be charged or discharged;
if the charge-discharge mode is the mode 3, the controlling the energy storage device to charge or discharge according to the charge-discharge mode comprises:
if the current load value is larger than the minimum peak value after peak clipping every month, switching to a mode 3-1, otherwise, switching to a mode 3-2;
in the mode 3-1, if the existing energy in the energy storage equipment does not meet the peak clipping requirement, the energy storage equipment is controlled to discharge by adopting a backtracking method; if the energy in the energy storage equipment meets the peak clipping requirement, controlling the energy storage equipment to discharge;
in the mode 3-2, controlling the energy storage equipment to discharge the maximum power;
if the charge-discharge mode is the mode 4, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes:
controlling the energy storage equipment to be charged in the whole process; the charging energy is selected by considering the load curve and the charge state constraint simultaneously
Wherein,
to take into account the charge capacity of the load curve area,
charging energy being state-of-charge bound, SchActual charging energy for each segment;
if the charge-discharge mode is the mode 5, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: controlling the energy storage equipment not to be charged or discharged;
if the charge-discharge mode is the mode 6, the controlling the energy storage device to charge or discharge according to the charge-discharge mode includes: and controlling the energy storage device to discharge at the maximum power.
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