CN114744659A - Energy storage charging and discharging control method and device and storage medium - Google Patents
Energy storage charging and discharging control method and device and storage medium Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 71
- 238000007599 discharging Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
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- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of energy storage, in particular to a charge and discharge control method, a device and a storage medium for energy storage, wherein the method comprises the following steps: acquiring a preset charging and discharging schedule; determining a charge and discharge plan corresponding to the current moment according to the preset charge and discharge plan table, if the charge and discharge plan corresponding to the current moment is discharge, determining the output power of stored energy according to the dischargeable capacity of the stored energy, and controlling the stored energy to discharge outwards according to the output power until the dischargeable capacity of the stored energy is reduced to a preset first power; if the charging and discharging plan corresponding to the current moment is charging, determining the input power of energy storage according to the chargeable capacity of the energy storage, and controlling the energy storage to charge according to the input power until the chargeable capacity of the energy storage reaches a preset second power; wherein the first power is less than the second power; the invention can charge and discharge efficiently and reliably.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a charge and discharge control method and device for energy storage and a storage medium.
Background
The energy storage power station is used as a part of a distributed energy storage system, and the cooperative control between the energy storage power station and the power grid is beneficial to the peak load shifting utilization of electric energy, and the effects of side peak clipping and valley filling of the power grid and the like are realized. In the prior art, when energy storage is used for performing charging and discharging operations, the energy storage is generally charged and discharged by adopting fixed power, the efficiency is low, and the energy storage cannot cope with a changing power utilization scene.
Therefore, it is necessary to provide an efficient and reliable energy storage charging and discharging strategy, which can efficiently and reliably perform charging and discharging.
Disclosure of Invention
The present invention is directed to a method, an apparatus, and a storage medium for controlling charging and discharging of stored energy, so as to solve one or more technical problems in the prior art and provide at least one useful choice or creation condition.
In order to achieve the purpose, the invention provides the following technical scheme:
a charge and discharge control method for energy storage, the method comprising the steps of:
step S100, acquiring a preset charge and discharge schedule; the charging and discharging schedule comprises a charging and discharging schedule corresponding to each time period and a maximum rated power corresponding to the charging and discharging schedule, and the charging and discharging schedule comprises scheduled charging and scheduled discharging;
step S200, determining a charge and discharge plan corresponding to the current moment according to the preset charge and discharge plan table, and executing step S300 if the charge and discharge plan corresponding to the current moment is a planned discharge; if the charge-discharge plan corresponding to the current moment is the planned charge, executing step S400;
step S300, determining the output power of stored energy according to the dischargeable capacity of stored energy, and controlling the stored energy to discharge outwards according to the output power until the dischargeable capacity of stored energy is reduced to a preset first power;
step S400, determining input power of stored energy according to the chargeable capacity of the stored energy, and controlling the stored energy to be charged according to the input power until the chargeable capacity of the stored energy reaches a preset second power; wherein the first power is less than the second power.
Further, in step S300, the determining an output power of stored energy according to the dischargeable capacity of stored energy, and controlling the stored energy to discharge to the outside according to the output power until the dischargeable capacity of stored energy is reduced to a preset first power includes:
step S310, obtaining the dischargeable capacity of the stored energy;
step S320, determining whether the dischargeable capacity of the energy storage is greater than a preset first power, if so, executing step S330; otherwise, executing step S380;
step S330, acquiring a preset first power, and setting the preset first power as the initial power of energy storage;
step S340, controlling the stored energy to start discharging with the initial power, and determining whether the stored energy generates reverse flow, if so, executing step S350; if not, go to step S370;
step S350, determining whether the frequency of the stored energy generated reverse flow reaches a set frequency threshold value, and if not, executing step S360; if yes, go to step S380;
step S360, after the initial power of the stored energy is updated to n.k.P 1, executing step S340; wherein k is a preset proportionality coefficient, k is more than 0 and less than 1, n is the frequency of the stored energy for generating reverse flow, and P1 is a preset first power;
step S370, gradually increasing the output power of the stored energy from the initial power to the maximum rated power by adopting a step approach mode, and controlling the stored energy to discharge outwards according to the output power in real time until the dischargeable capacity of the stored energy is reduced to a preset first power;
and step S380, controlling the stored energy to stop discharging, and switching to discharge to the outside through a transformer, wherein the transformer is connected with the stored energy.
Further, in step S340, the determining whether the stored energy generates a reverse flow includes:
and detecting the active power of the transformer for supplying power to the stored energy, and if the active power is a negative value, determining that the stored energy generates reverse flow.
Further, in step S370, the step-by-step approaching the output power of the stored energy from the initial power to the maximum rated power includes:
and according to a set time interval, gradually increasing the energy storage output power by a set step power until the energy storage output power reaches the maximum rated power.
Further, in step S400, the determining an input power of the stored energy according to a chargeable capacity of the stored energy, and controlling the stored energy to be charged according to the input power until the chargeable capacity of the stored energy reaches a second power set in advance includes:
step S410, acquiring the residual capacitance of the transformer; the transformer is connected with the energy storage, and the residual capacity of the transformer is the difference value between the reserved capacity of the transformer and the active power currently output by the transformer; the reserved capacity of the transformer is obtained by reducing the total capacity of the transformer;
step S420, determining whether the residual electric capacity of the transformer is greater than a preset capacity threshold, if so, executing step S430; otherwise, executing step S460;
step S430, acquiring the chargeable capacity of the stored energy;
step S440, determining whether the chargeable capacity of the stored energy is greater than a preset second power, if so, executing step S450; otherwise, executing step S460;
step S450, increasing the input power of the stored energy from zero to the maximum rated power step by step in a stepping approach mode, and controlling the stored energy to charge according to the input power in real time until the chargeable capacity of the stored energy reaches a preset second power;
step S460, controlling the transformer to stop discharging, and executing step S410.
Further, before step S200, the method further includes:
and detecting whether the working parameters of the energy storage inverter, the battery manager and the transformer are normal or not, and executing the step S200 if the working parameters of the energy storage inverter, the battery manager and the transformer are determined to be normal.
A charge and discharge control device for stored energy, the device comprising:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the energy storage charging and discharging control method as described in any one of the above.
A computer-readable storage medium having stored thereon a charge-discharge control program for energy storage, the charge-discharge control program for energy storage, when executed by a processor, implementing the steps of the charge-discharge control method for energy storage as claimed in any one of the above.
The invention has the beneficial effects that: the invention discloses a charge-discharge control method, a charge-discharge control device and a storage medium for energy storage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 without inventive exercise.
FIG. 1 is a schematic flow chart of a charge and discharge control method for energy storage according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an energy storage charge and discharge control device in an embodiment of the invention.
Detailed Description
The idea, specific structural components and technical effects of the present invention will be described clearly and completely in the following description in conjunction with the embodiments and the accompanying drawings to fully understand the objects, aspects and effects of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic flow chart of a charge and discharge control method for energy storage provided by the present invention, where the method includes the following steps:
step S100, acquiring a preset charge and discharge schedule; the charging and discharging schedule comprises charging and discharging schedules corresponding to all time periods and maximum rated power corresponding to the charging and discharging schedules, and the charging and discharging schedules comprise planned charging and planned discharging;
specifically, a charge and discharge plan corresponding to each time period is established in advance, the charge and discharge plan corresponding to each time period is set as a planned charge or a planned discharge, and if the charge and discharge plan corresponding to the time period is the planned charge, the maximum rated power of the charge is set; if the charge-discharge plan corresponding to the time period is the planned charge, setting the maximum rated power of the charge; for example, assume that 3 o 'clock to 6 o' clock is scheduled charging, which corresponds to a maximum rated power of 200 KW;
step S200, determining a charge and discharge plan corresponding to the current moment according to the preset charge and discharge plan table, and executing step S300 if the charge and discharge plan corresponding to the current moment is a planned discharge; if the charge-discharge plan corresponding to the current moment is the planned charge, executing the step S400;
step S300, determining the output power of stored energy according to the dischargeable capacity of stored energy, and controlling the stored energy to discharge outwards according to the output power until the dischargeable capacity of stored energy is reduced to a preset first power;
step S400, determining input power of stored energy according to the chargeable capacity of the stored energy, and controlling the stored energy to be charged according to the input power until the chargeable capacity of the stored energy reaches a preset second power; wherein the first power is less than the second power.
In the embodiment, a preset charging and discharging schedule is obtained first, a charging and discharging schedule corresponding to the current moment is determined according to the preset charging and discharging schedule, the output power or the input power of stored energy is further determined, the appropriate output power or the appropriate input power is determined in real time, the charging and discharging efficiency of stored energy is improved, and the stored energy is charged and discharged in the first power range and the second power range, so that the high efficiency and the reliability of energy storage work are ensured.
As a further improvement of the foregoing embodiment, in step S300, the determining an output power of the stored energy according to the dischargeable capacity of the stored energy, and controlling the stored energy to discharge the stored energy according to the output power until the dischargeable capacity of the stored energy is reduced to a preset first power includes:
step S310, obtaining the dischargeable capacity of the stored energy;
step S320, determining whether the dischargeable capacity of the energy storage is greater than a preset first power, if so, executing step S330; otherwise, executing step S380;
step S330, acquiring a preset first power, and setting the preset first power as the initial power of energy storage;
step S340, controlling the stored energy to start discharging with the initial power, and determining whether the stored energy generates counter current, if so, executing step S350; if not, go to step S370;
step S350, determining whether the frequency of the stored energy generated reverse flow reaches a set frequency threshold value, and if not, executing step S360; if yes, go to step S380;
step S360, after the initial power of the stored energy is updated to n.k.P 1, step S340 is executed; wherein k is a preset proportionality coefficient, k is more than 0 and less than 1, n is the number of times of reverse flow generated by the stored energy, and P1 is a preset first power;
step S370, gradually increasing the output power of the stored energy from the initial power to the maximum rated power by adopting a step approach mode, and controlling the stored energy to discharge outwards according to the output power in real time until the dischargeable capacity of the stored energy is reduced to a preset first power;
and step S380, controlling the stored energy to stop discharging, and switching to discharge to the outside through a transformer, wherein the transformer is connected with the stored energy.
As a further improvement of the above embodiment, in step S370, the step-by-step approaching the output power of the stored energy from the initial power to the maximum rated power includes:
and according to a set time interval, gradually increasing the energy storage output power by a set step power until the energy storage output power reaches the maximum rated power.
Specifically, the output power of the stored energy is calculated by the following formula: and Pout is P0+ m Pt, wherein Pout is the output power of the energy storage, P0 is the initial power of the energy storage, and Pt is the set stepping power.
In one embodiment, n is 3, m is a variable, m is a natural number, P0 is 40kw, P1 is 40kw, and the maximum rated power is 200 kw.
As a further improvement of the above embodiment, in step S340, the determining whether the stored energy generates a reverse flow includes:
and detecting the active power of the transformer for supplying power to the stored energy, and if the active power is a negative value, determining that the stored energy generates reverse flow.
Generally, when a plurality of loads are simultaneously disconnected from the transformer, the transformer is caused to generate reverse flow. In one embodiment, the active power of the transformer supplying the energy storage is detected at intervals of 250ms, i.e. the value of the active power is refreshed every 250 ms.
As a further improvement of the above embodiment, the step S400 of determining an input power for storing energy according to a chargeable capacity of the stored energy and controlling the stored energy to be charged according to the input power until the chargeable capacity of the stored energy reaches a preset second power includes:
step S410, acquiring the residual capacitance of the transformer; the transformer is connected with the energy storage, and the residual capacity of the transformer is the difference value between the reserved capacity of the transformer and the active power currently output by the transformer; the reserved capacity of the transformer is obtained by reducing the total capacity of the transformer;
in one embodiment, the reserved capacity of the transformer is obtained by reducing the total capacity of the transformer in proportion;
step S420, determining whether the residual electric capacity of the transformer is greater than a preset capacity threshold, if so, executing step S430; otherwise, executing step S460;
step S430, acquiring the chargeable capacity of the stored energy;
step S440, determining whether the chargeable capacity of the stored energy is greater than a preset second power, if so, executing step S450; otherwise, executing step S460;
step S450, increasing the input power of the stored energy from zero to the maximum rated power step by step in a stepping approach mode, and controlling the stored energy to charge according to the input power in real time until the chargeable capacity of the stored energy reaches a preset second power;
step S460, controlling the transformer to stop discharging, and executing step S410.
As a further improvement of the above embodiment, before step S200, the method further includes:
and detecting whether the working parameters of the energy storage inverter, the battery manager and the transformer are normal or not, and executing the step S200 if the working parameters of the energy storage inverter, the battery manager and the transformer are determined to be normal.
In an embodiment, if it is determined that any one of the working parameters of the energy storage inverter, the battery manager and the transformer is abnormal, an alarm is given and the energy storage is stopped from being controlled to be charged and discharged.
In correspondence with the method of fig. 1, referring to fig. 2, an embodiment of the present invention further provides a charge and discharge control apparatus for energy storage, the apparatus including a memory 11, a processor 12, and a computer program stored on the memory 11 and executable on the processor 12.
The processor 12 and the memory 11 may be connected by a bus or other means.
The non-transitory software program and instructions required to implement the charge and discharge control method for stored energy of the above-described embodiment are stored in the memory 11, and when executed by the processor 12, the charge and discharge control method for stored energy of the above-described embodiment is performed.
Corresponding to the method of fig. 1, an embodiment of the present invention further provides a computer-readable storage medium, on which an energy storage charging and discharging control program is stored, and when the energy storage charging and discharging control program is executed by a processor, the steps of the energy storage charging and discharging control method according to any one of the above embodiments are implemented.
The contents in the method embodiments are all applicable to the device embodiments, the functions specifically implemented by the device embodiments are the same as those in the method embodiments, and the beneficial effects achieved by the device embodiments are also the same as those achieved by the method embodiments.
The Processor may be a Central-Processing Unit (CPU), other general-purpose Processor, a Digital Signal Processor (DSP), an Application-Specific-Integrated-Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. The general processor can be a microprocessor or the processor can be any conventional processor, etc., the processor is a control center of the energy storage charging and discharging control device, and various interfaces and lines are utilized to connect all parts of the whole energy storage charging and discharging control device operable device.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the energy storage charging and discharging control device by running or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart-Media-Card (SMC), a Secure-Digital (SD) Card, a Flash memory Card (Flash-Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
While the present invention has been described in considerable detail and with particular reference to several of these embodiments, it is not intended to be limited to any such details or embodiments or any particular embodiment, but rather it is to be construed according to the appended claims so as to provide a broad, enabling interpretation of such claims in view of the prior art, and therefore to effectively encompass the intended scope of the invention. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (8)
1. A charge and discharge control method for energy storage is characterized by comprising the following steps:
step S100, acquiring a preset charge and discharge schedule; the charging and discharging schedule comprises a charging and discharging schedule corresponding to each time period and a maximum rated power corresponding to the charging and discharging schedule, and the charging and discharging schedule comprises scheduled charging and scheduled discharging;
step S200, determining a charge and discharge plan corresponding to the current moment according to the preset charge and discharge plan table, and executing step S300 if the charge and discharge plan corresponding to the current moment is a planned discharge; if the charge-discharge plan corresponding to the current moment is the planned charge, executing step S400;
step S300, determining the output power of stored energy according to the dischargeable capacity of stored energy, and controlling the stored energy to discharge outwards according to the output power until the dischargeable capacity of stored energy is reduced to a preset first power;
step S400, determining input power of stored energy according to the chargeable capacity of the stored energy, and controlling the stored energy to be charged according to the input power until the chargeable capacity of the stored energy reaches a preset second power; wherein the first power is less than the second power.
2. The method according to claim 1, wherein in step S300, the determining an output power of the stored energy according to the dischargeable capacity of the stored energy, and controlling the stored energy to discharge to the outside according to the output power until the dischargeable capacity of the stored energy is reduced to a predetermined first power includes:
step S310, obtaining the dischargeable capacity of the stored energy;
step S320, determining whether the dischargeable capacity of the stored energy is greater than a preset first power, if yes, executing step S330; otherwise, executing step S380;
step S330, acquiring a preset first power, and setting the preset first power as the initial power of energy storage;
step S340, controlling the stored energy to start discharging with the initial power, and determining whether the stored energy generates reverse flow, if so, executing step S350; if not, go to step S370;
step S350, determining whether the frequency of the stored energy generated reverse flow reaches a set frequency threshold value, and if not, executing step S360; if yes, go to step S380;
step S360, after the initial power of the stored energy is updated to n.k.P 1, executing step S340; wherein k is a preset proportionality coefficient, k is more than 0 and less than 1, n is the frequency of the stored energy for generating reverse flow, and P1 is a preset first power;
step S370, gradually increasing the output power of the stored energy from the initial power to the maximum rated power by adopting a step approach mode, and controlling the stored energy to discharge outwards according to the output power in real time until the dischargeable capacity of the stored energy is reduced to a preset first power;
and step S380, controlling the stored energy to stop discharging, and switching to discharge to the outside through a transformer, wherein the transformer is connected with the stored energy.
3. The method according to claim 2, wherein the determining whether the stored energy generates a reverse flow in step S340 includes:
and detecting the active power of the transformer for supplying power to the energy storage, and if the active power is a negative value, determining that the energy storage generates a reverse flow.
4. The method according to claim 2, wherein the step S370 of gradually increasing the output power of the stored energy from the initial power to the maximum rated power by using a step-by-step approach includes:
and according to a set time interval, gradually increasing the energy storage output power by a set step power until the energy storage output power reaches the maximum rated power.
5. The method according to claim 1, wherein the step S400 of determining an input power of the energy storage according to the chargeable capacity of the energy storage and controlling the energy storage to be charged according to the input power until the chargeable capacity of the energy storage reaches a second predetermined power comprises:
step S410, acquiring the residual capacitance of the transformer; the transformer is connected with the energy storage, and the residual capacity of the transformer is the difference value between the reserved capacity of the transformer and the active power currently output by the transformer; the reserved capacity of the transformer is obtained by reducing the total capacity of the transformer;
step S420, determining whether the residual electric capacity of the transformer is greater than a preset capacity threshold, if so, executing step S430; otherwise, executing step S460;
step S430, acquiring the chargeable capacity of the stored energy;
step S440, determining whether the chargeable capacity of the stored energy is greater than a preset second power, if so, executing step S450; otherwise, executing step S460;
step S450, increasing the input power of the stored energy from zero to the maximum rated power step by step in a stepping approach mode, and controlling the stored energy to charge according to the input power in real time until the chargeable capacity of the stored energy reaches a preset second power;
step S460, controlling the transformer to stop discharging, and executing step S410.
6. The method according to claim 1, wherein before step S200, the method further comprises:
and detecting whether the working parameters of the energy storage inverter, the battery manager and the transformer are normal or not, and executing the step S200 if the working parameters of the energy storage inverter, the battery manager and the transformer are determined to be normal.
7. An energy storage charge and discharge control device, characterized in that the device comprises:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the energy storage charging and discharging control method according to any one of claims 1 to 6.
8. A computer-readable storage medium, wherein a charge and discharge control program for energy storage is stored on the computer-readable storage medium, and when the charge and discharge control program for energy storage is executed by a processor, the steps of the charge and discharge control method for energy storage according to any one of claims 1 to 6 are implemented.
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