CN111900774A - Energy scheduling method - Google Patents
Energy scheduling method Download PDFInfo
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- CN111900774A CN111900774A CN202010725891.2A CN202010725891A CN111900774A CN 111900774 A CN111900774 A CN 111900774A CN 202010725891 A CN202010725891 A CN 202010725891A CN 111900774 A CN111900774 A CN 111900774A
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- battery pack
- maintenance
- scheduling method
- power
- energy scheduling
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses an energy scheduling method. The energy scheduling method comprises the following steps: in the charging stage of the battery pack, acquiring total charging power P1; in the discharging process of the battery pack maintenance stage, the total discharging power P2 is obtained in real time; when detecting that the continuous duration of P2 < P1-K < P2+ L is equal to a first preset duration, reducing the discharge power of the battery pack, and when detecting that P2+ L < P1-K, recovering the discharge power of the battery pack to the original discharge power; when the continuous duration of P2-P1-K-P2 + M is detected to be equal to a second preset duration, starting a new load so that the new load and the original load discharge the battery pack together to form current for discharging; and K is a safety margin, L and M are positive numbers, L is less than M, and the first preset time length is less than the second preset time length. The technical scheme provided by the embodiment of the invention ensures complete discharge in the maintenance process of the battery pack and improves the maintenance effect of the battery pack.
Description
Technical Field
The embodiment of the invention relates to the technical field of electric automobile charging and battery replacement, in particular to an energy scheduling method.
Background
The charging and replacing power station is used for charging, replacing and maintaining a battery pack in the electric automobile, and further development of the electric automobile industry is promoted.
In the prior art, in the discharging process of the battery pack maintenance stage, the discharging power is not limited, so that the situation that the total discharging power is greater than the total charging power in the charging stage is easy to occur, the charging process of the battery pack is interrupted, the battery pack is incompletely discharged, and the maintenance effect of the battery pack is influenced.
Disclosure of Invention
The invention provides an energy scheduling method, which is used for ensuring complete discharge of a battery pack and improving the maintenance effect of the battery pack.
The embodiment of the invention provides an energy scheduling method, which comprises the following steps:
in the charging stage of the battery pack, acquiring total charging power P1;
in the discharging process of the battery pack maintenance stage, the total discharging power P2 is obtained in real time;
when detecting that the continuous duration of P2 < P1-K < P2+ L is equal to a first preset duration, reducing the discharge power of the battery pack, and when detecting that P2+ L < P1-K, recovering the discharge power of the battery pack to the original discharge power;
when the continuous duration of P2-P1-K-P2 + M is detected to be equal to a second preset duration, starting a new load so that the new load and the original load discharge the battery pack together to form current for discharging;
and K is a safety margin, L and M are positive numbers, L is less than M, and the first preset time length is less than the second preset time length.
According to the technical scheme provided by the embodiment of the invention, the total charging power P1 is obtained in the charging stage of the battery pack, the total discharging power P2 is obtained in real time in the discharging process of the maintenance stage of the battery pack, the continuous duration of P2 < P1-K < P2+ L is detected to be equal to the first preset duration, the discharging power of the battery pack is reduced, the discharging power of the battery pack is recovered to the original discharging power when P2+ L < P1-K is detected, and the new load is started when the continuous duration of P2 < P1-K < P2+ M is detected to be equal to the second preset duration, so that the new load and the original load discharge together to discharge the battery pack to form current for discharging, complete discharging in the maintenance process of the battery pack is ensured, and the maintenance effect of the battery pack is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic flowchart of an energy scheduling method according to an embodiment of the present invention;
fig. 2 is a schematic structural distribution diagram of a power supply system according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of an energy scheduling method according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides an energy scheduling method, which comprises the following steps:
in the charging stage of the battery pack, acquiring total charging power P1;
in the discharging process of the battery pack maintenance stage, the total discharging power P2 is obtained in real time;
when detecting that the continuous duration of P2 < P1-K < P2+ L is equal to a first preset duration, reducing the discharge power of the battery pack, and when detecting that P2+ L < P1-K, recovering the discharge power of the battery pack to the original discharge power;
when the continuous duration of P2-P1-K-P2 + M is detected to be equal to a second preset duration, starting a new load so that the new load and the original load discharge the battery pack together to form current for discharging;
and K is a safety margin, L and M are positive numbers, L is less than M, and the first preset time length is less than the second preset time length.
According to the technical scheme provided by the embodiment of the invention, the total charging power P1 is obtained in the charging stage of the battery pack, the total discharging power P2 is obtained in real time in the discharging process of the maintenance stage of the battery pack, the continuous duration of P2 < P1-K < P2+ L is detected to be equal to the first preset duration, the discharging power of the battery pack is reduced, the discharging power of the battery pack is recovered to the original discharging power when P2+ L < P1-K is detected, and the new load is started when the continuous duration of P2 < P1-K < P2+ M is detected to be equal to the second preset duration, so that the new load and the original load discharge together to discharge the battery pack to form current for discharging, complete discharging in the maintenance process of the battery pack is ensured, and the maintenance effect of the battery pack is improved.
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 obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 1 is a flowchart illustrating an energy scheduling method according to an embodiment of the present invention. The energy scheduling method may be applied to the power supply system shown in fig. 2.
As shown in fig. 2, the power supply system includes a battery pack maintenance module 110, a load module 120, a reverse current blocking module 130, an energy management module 140, a battery pack charging module 150, and a power consumption equipment power supply module 160, wherein the battery pack maintenance module 110, the load module 120, the reverse current blocking module 130, the battery pack charging module 150, and the power consumption equipment power supply module 160 are all connected to the energy management module 140, the reverse current blocking module 130 is connected to the battery pack maintenance module 110, the load module 120, the battery pack charging module 150, the power consumption equipment power supply module 160, and an external power grid, and a connection point O in fig. 2 is connected to the external power grid.
For example, with continued reference to fig. 2, the battery pack maintenance module 110 may include a bidirectional AC/DC converter 111 and at least one bidirectional DC/DC converter 112, the load module 120 includes at least one load, the reverse current blocking module 130 includes a circuit breaker 132 and a four quadrant electricity meter 131, and the battery pack charging module 150 includes at least one unidirectional AC/DC converter 151.
Specifically, the battery pack maintenance module 110 is configured to charge and maintain the battery pack, where the maintenance includes a discharging phase and a charging phase that are performed in sequence. The load module 120 is used to bleed off current generated during discharge during the maintenance phase of the battery pack. The reverse current blocking module 130 is configured to detect a current at an inlet of an external power grid, determine whether a reverse current occurs, and cut off the external power grid after determining that the reverse current occurs. The energy management module 140 is configured to control normal operations of the battery pack maintenance module 110, the load module 120, the reverse current blocking module 130, the battery pack charging module 150, and the electric device power supply module 160, so as to implement reasonable energy scheduling. The battery pack charging module 150 is used for charging the battery pack with current provided by an external power grid. The power supply module 160 is used to implement functions of its internal components, which include, for example, a power exchange cabinet, a fire fighting system, a monitoring system, and an environmental system, and consumes power during the discharging process of the battery pack maintenance phase.
As shown in fig. 1, the energy scheduling method may specifically include the following steps:
It should be noted that the battery pack charging phase refers to a phase of supplying power to the battery pack maintenance module 110, the battery pack charging module 150, and the electric device power supply module 160 by using the current provided by the external power grid. For example, the total charging power P1 may be obtained by an electric meter installed on an inlet line of the external power grid.
It should be noted that the maintenance phase of the battery pack includes a charging process and a discharging process, and the present embodiment is configured to adjust the energy during the discharging process.
For example, the total discharge power P2 may be obtained by an electric meter disposed on the main line of the battery pack maintenance module 110. The electricity meter may be located, for example, between the bidirectional AC/DC converter and the three bidirectional DC/DC converters of fig. 2.
And 103, when detecting that the continuous duration of P2 < P1-K < P2+ L is equal to a first preset duration, reducing the discharge power of the battery pack, and when detecting that P2+ L < P1-K, restoring the discharge power of the battery pack to the original discharge power.
The first preset time can be reasonably set according to actual needs, for example, the value range of the first preset time is 0.5-1.5 s.
The essential meaning of step 103 is: under the condition of reserving safety margin, when the duration that P2 approaches P1 reaches a first preset duration, the difference between P2 and P1 is increased by reducing the discharge power of the battery pack, and after P2 is far away from P1, the discharge power of the battery pack can be recovered, so that the condition that P2 continuously approaches P1 to cause that P2 is larger than P2 is avoided, and further, the condition that the discharge of the battery pack is not completely stopped after the condition occurs is avoided.
And 104, detecting that the continuous duration of P2-P1-K-P2 + M is equal to a second preset duration, starting a new load so that the new load and the original load discharge the battery pack together to form current for discharging, wherein K is a safety margin, L and M are positive numbers, L is less than M, and the first preset duration is less than the second preset duration.
It should be noted that the original load is a load that is connected to the power supply system before the new load is connected to the power supply system, in this embodiment, no other load is connected to the power supply system before the new load is connected to the power supply system, and the new load is a load that is first connected to the power supply system.
The second preset time can be reasonably set according to actual needs, for example, the value range of the second preset time is 2-4 s.
It should be noted that the second preset time period is longer than the first preset time period, and P2+ M is longer than P2+ L, so if it is detected that the continuous duration of P2 < P1-K < P2+ M is equal to the second preset time period, it indicates that the difference between P2 and P1 is not effectively increased in step 103 by reducing the discharging power of the battery pack.
The essential meaning of step 104 is: under the condition that safety margin is reserved, when the difference value between the P2 and the P1 cannot be effectively increased in the step 103 by reducing the discharge power of the battery pack, the discharge speed of the current formed by the discharge of the battery pack is accelerated by accessing a new load, so that the condition that the P2 is more than the P2 due to the fact that the P2 continuously approaches the P1 is avoided, the situation that the discharge of the battery pack is not completely stopped after the condition occurs is further avoided, the complete discharge of the battery pack is ensured, and the maintenance effect of the battery pack is improved.
According to the technical scheme provided by the embodiment, the total charging power P1 is obtained in the charging stage of the battery pack, the total discharging power P2 is obtained in real time in the discharging process of the maintenance stage of the battery pack, the continuous duration of P2 < P1-K < P2+ L is detected to be equal to the first preset duration, the discharging power of the battery pack is reduced, the discharging power of the battery pack is recovered to the original discharging power when P2+ L < P1-K is detected, and the continuous duration of P2 < P1-K < P2+ M is detected to be equal to the second preset duration, a new load is started, so that the new load and the original load discharge the battery pack together to form current discharge, complete discharge is ensured in the maintenance process of the battery pack, and the maintenance effect of the battery pack is improved.
For example, L ═ a × W, W may be the total capacity of the battery pack, and a may range from 0.25 to 0.35.
In this embodiment, the parameters of the battery pack can be shown in table 1 below:
the total capacity of the battery pack is 52.5KWh, and L may be 17KW, for example.
Optionally, M may be equal to the normal output charging power of the bidirectional charger corresponding to each battery pack.
The bidirectional charger is, for example, a bidirectional charger corresponding to one bidirectional DC/DC in the battery pack maintenance module 110 in fig. 2. For example, the normal output charging power of the bidirectional charger corresponding to each battery pack may be 26.7 KW.
Illustratively, the value range of the safety margin can be 5-7 KW, and more preferably, the safety margin can be 6 KW.
In this embodiment, the energy scheduling method may further include: and when a new battery pack maintenance requirement is detected, judging whether the P1 and the current P2 meet a maintenance starting condition, if so, allowing the new battery pack to be maintained, and when a maintenance starting instruction corresponding to the new battery pack is detected, starting to maintain the new battery pack.
It should be noted that the battery pack maintenance module includes a plurality of battery pack maintenance branches, each of which is used to perform maintenance on one battery pack at a time, for example, each of the bidirectional DC/DC converters in fig. 2 belongs to one battery pack maintenance branch. The present embodiment is suitable for determining whether a single battery pack maintenance branch starts the battery pack maintenance operation, for example, before the battery pack maintenance branch is started, the battery pack maintenance module may have a battery pack maintenance sub-branch that is already performing the battery pack maintenance, or may not have a battery pack maintenance sub-branch that is already performing the battery pack maintenance, and the latter P2 is equal to 0.
Optionally, the maintenance start condition may be: p1 > P2+ N, N is a positive number.
It should be noted that the setting of the maintenance start condition allows the battery pack to be normally discharged, and thus the maintenance operation can be normally performed.
Illustratively, N ═ b × W, W may be the total capacity of the battery pack, and b may range from 0.45 to 0.55.
It should be noted that, this arrangement mode makes the difference between P2 and P1 large when starting to maintain the battery pack, and the situation that P2 > P1 occurs in a short time, thus ensuring the normal operation of the maintenance operation of the battery pack. Specifically, N may be 30KW, for example.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An energy scheduling method, comprising:
in the charging stage of the battery pack, acquiring total charging power P1;
in the discharging process of the battery pack maintenance stage, the total discharging power P2 is obtained in real time;
when detecting that the continuous duration of P2 < P1-K < P2+ L is equal to a first preset duration, reducing the discharge power of the battery pack, and when detecting that P2+ L < P1-K, recovering the discharge power of the battery pack to the original discharge power;
when the continuous duration of P2-P1-K-P2 + M is detected to be equal to a second preset duration, starting a new load so that the new load and the original load discharge the battery pack together to form current for discharging;
and K is a safety margin, L and M are positive numbers, L is less than M, and the first preset time length is less than the second preset time length.
2. The energy scheduling method of claim 1, wherein L is a × W, W is a total capacity of the battery pack, and a is in a range of 0.25 to 0.35.
3. The energy scheduling method of claim 1, wherein M is equal to the normal output charging power of the bidirectional charger corresponding to each battery pack.
4. The energy scheduling method of claim 1, wherein the safety margin is 5-7 kw.
5. The energy scheduling method according to claim 1, wherein the first preset duration is in a range of 0.5-1.5 s.
6. The energy scheduling method according to claim 1, wherein the second preset duration is in a range of 2-4 s.
7. The energy scheduling method of claim 1, further comprising:
when a new battery pack maintenance requirement is detected, whether the P1 and the current P2 meet a maintenance starting condition or not is judged, and if yes, the new battery pack is allowed to be maintained;
and when a maintenance starting instruction corresponding to a new battery pack is detected, starting to maintain the new battery pack.
8. The energy scheduling method according to claim 7, wherein the maintenance start condition is: p1 > P2+ N, N is a positive number.
9. The energy scheduling method of claim 8, wherein N ═ b × W, W is the total capacity of the battery pack, and b has a value in a range of 0.45 to 0.55.
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