CN116316727A - Energy storage power supply control method and device, energy storage power supply and storage medium - Google Patents

Energy storage power supply control method and device, energy storage power supply and storage medium Download PDF

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Publication number
CN116316727A
CN116316727A CN202310244136.6A CN202310244136A CN116316727A CN 116316727 A CN116316727 A CN 116316727A CN 202310244136 A CN202310244136 A CN 202310244136A CN 116316727 A CN116316727 A CN 116316727A
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China
Prior art keywords
power supply
input
power
energy storage
direct current
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CN202310244136.6A
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Chinese (zh)
Inventor
请求不公布姓名
王福强
尚尊超
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Lixun Precision Technology Xi'an Co ltd
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Lixun Precision Technology Xi'an Co ltd
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Priority to CN202310244136.6A priority Critical patent/CN116316727A/en
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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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The application relates to an energy storage power supply control method, an energy storage power supply control device, an energy storage power supply and a storage medium, wherein the method comprises the following steps: acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information; determining the type of the input power supply according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input; and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to charge and discharge control logic corresponding to the input power supply type. The method can determine the type of the input power source connected with the input end of the energy storage power source according to the signal updating state, thereby providing possibility for the energy storage power source to be configured with only one input end, saving the cost and reducing the occupation of the internal space of the product.

Description

Energy storage power supply control method and device, energy storage power supply and storage medium
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage power supply control method, an energy storage power supply control device, an energy storage power supply and a storage medium.
Background
With the continuous development of energy storage technology, photovoltaic energy storage products are increasingly widely used. On the photovoltaic energy storage product, because the generating efficiency of the photovoltaic panel can be limited by factors such as weather and shielding and application scenes, a charging port of a mains supply adapter is usually added in the product design process, and the charging port is matched with the photovoltaic panel for application and is used as a product input design. At present, two input ports exist in a common photovoltaic energy storage system, one is a photovoltaic panel, and the other is a direct current access port after a household power distribution network passes through an adapter power supply. The direct-current boosting topology enables the photovoltaic panel of the input port to reach the maximum input power by controlling the impedance relation of the direct-current boosting topology, and the photovoltaic panel is utilized with the maximum efficiency.
However, for low-power portable photovoltaic energy storage power sources, multiple input ports can occupy volumes on the device panel, which is detrimental to product design layout and increases device cost.
Disclosure of Invention
In order to solve the technical problem of how to reduce the cost of energy storage power supply equipment, the application provides an energy storage power supply control method, an energy storage power supply control device, an energy storage power supply and a storage medium.
In a first aspect, the present application provides a method for controlling an energy storage power supply, the method including:
Acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
determining the type of the input power supply according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
according to the charge and discharge control logic corresponding to the input power supply type, controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply;
optionally, before the input power signal is acquired based on the preset input control information, the method further includes:
acquiring a preset adjustment rule of a switching tube; the switching tube is configured in the bidirectional direct current-direct current module or the isolated boosting inversion module;
the duty ratio of the switching tube is adjusted according to the preset adjustment rule, and the duty ratio of the switching tube is used as the input control information;
based on preset input control information, the obtaining the input power signal includes:
acquiring power values of a first end of a power bus at different duty ratios, and taking the power values as the input power supply signals;
Optionally, the determining the input power type according to the signal update state includes:
determining that the input power supply type is a power distribution network voltage source input under the condition that the signal update state indicates that the input power supply signal linearly grows in the target control period;
acquiring a first power supply signal corresponding to the maximum value of the input control information from the input power supply signal, and acquiring a second power supply signal from the input power supply signal, wherein the second power supply signal is the maximum value of the input power supply signal in the target control period;
when the signal update state indicates that the input power supply signal and the input control information are positively correlated in a preset interval, and the ratio of the first power supply signal to the second power supply signal is smaller than a preset threshold value, determining that the input power supply type is photovoltaic panel input; the preset threshold is smaller than one and larger than zero; the maximum value of the input control information in the preset interval is smaller than or equal to the input control information corresponding to the second power supply signal;
optionally, before the bidirectional direct current-to-direct current module is controlled to perform the charge-discharge operation on the energy storage power supply according to the charge-discharge control logic corresponding to the input power supply type, the method further includes:
Acquiring first power information of an energy storage battery pack in an energy storage unit;
acquiring second power information of an output load; the second power information is smaller than or equal to rated output power of the output load;
taking the sum of the first power information and the second power information as output power control information;
correspondingly, the controlling the bidirectional direct current to direct current module to perform charge and discharge operations on the energy storage power supply according to the charge and discharge control logic corresponding to the input power supply type comprises the following steps:
according to the output power control information and charge and discharge control logic corresponding to the input power type, controlling a bidirectional direct current-to-direct current module to perform charge and discharge operation on the energy storage power supply;
optionally, if the input power type is a photovoltaic panel input, the charge-discharge control logic corresponding to the photovoltaic panel input is a maximum power point tracking mode, where the maximum power point tracking mode is used for tracking the maximum input power of the photovoltaic panel, and the controlling the bidirectional dc-dc conversion module to perform the charge-discharge operation on the energy storage power supply according to the output power control information and the charge-discharge control logic corresponding to the input power type includes:
Under the condition that the input power of the power supply corresponding to the photovoltaic cell panel is larger than the output power control information, the bidirectional direct current-to-direct current module is limited to perform charge and discharge operation on the energy storage power supply;
controlling the bidirectional direct current to direct current module to execute charge and discharge operation on the energy storage power supply according to the maximum power point tracking mode under the condition that the power input by the photovoltaic cell panel is smaller than or equal to the output power control information;
optionally, if the input power type is a power distribution network voltage source input, charge and discharge control logic corresponding to the power distribution network voltage source input is a voltage source control logic, and the controlling the bidirectional dc-dc conversion module to perform charge and discharge operations on the energy storage power supply according to the output power control information and the charge and discharge control logic corresponding to the input power type includes:
and controlling the power input power corresponding to the power distribution network voltage source to be matched with the output power control information according to the voltage source control logic, and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply based on the power input power corresponding to the power distribution network voltage source and the output power control information.
In a second aspect, the present application provides an energy storage power supply control device, the device comprising:
the input power supply signal acquisition module is used for acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
the input power supply type determining module is used for determining the input power supply type according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
and the charge-discharge control module is used for controlling the bidirectional direct current-to-direct current module to execute charge-discharge operation on the energy storage power supply according to charge-discharge control logic corresponding to the input power supply type.
In a third aspect, the present application provides an energy storage power supply comprising: the power bus is connected with the power bus and the controller; the energy storage unit comprises a bidirectional direct current-to-direct current module and an energy storage battery pack;
the first end of the power bus is connected with the input end of the energy storage power supply; the input end of the energy storage power supply is used for connecting a photovoltaic cell panel or a power distribution network voltage source;
The second end of the power bus is connected with the first end of the bidirectional direct current-to-direct current module, and the second end of the bidirectional direct current-to-direct current module is connected with the energy storage battery pack;
the third end of the power bus is connected with the first end of the isolation boosting inversion module, and the second end of the isolation boosting inversion module is used for being connected with an output load;
the controller is connected with the control end of the bidirectional direct current-direct current module; and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply.
Optionally, the at least one group of energy storage units comprises one master energy storage unit and at least one slave energy storage unit;
the main energy storage unit comprises a main bidirectional direct current-direct current conversion module and a main energy storage battery pack; the secondary energy storage unit comprises a secondary bidirectional direct current-direct current conversion module and a secondary energy storage battery pack;
the master bidirectional direct current-to-direct current module and the slave bidirectional direct current-to-direct current module are in communication connection;
optionally, the controller is further connected to a control end of the isolation boost inversion module, so that the controller determines an input power type of an input end of the energy storage power supply by controlling a duty ratio of a switching tube in the isolation boost inversion module or the bidirectional direct current-to-direct current module;
Optionally, the input end of the energy storage power supply is connected with a junction box of the photovoltaic cell panel;
optionally, the input end of the energy storage power supply is connected with the output end of the isolation buck rectifying module, and the input end of the isolation buck rectifying module is connected with the power distribution network voltage source;
optionally, the isolated boost inversion module includes: an isolation unit and a boost inversion unit;
the first end of the isolation unit is connected with the third end of the power bus, the second end of the isolation unit is connected with the first end of the boost inversion unit, and the second end of the boost inversion unit is used as the second end of the isolation boost inversion module;
optionally, the bidirectional direct current-to-direct current module includes: the feedback circuit, the control unit and the buck-boost circuit;
the first end of the feedback circuit is connected with the second end of the power bus to sample input voltage;
the second end of the feedback circuit is connected with the control unit; the controller controls the step-up/step-down circuit through the control unit according to the sampled input voltage so as to execute charge/discharge operation on the energy storage battery pack;
optionally, the step-up/step-down circuit includes a step-up/step-down chopper circuit.
In a fourth aspect, the present application provides a generator comprising the stored energy power supply of any one of the third aspects.
In a fifth aspect, the present application provides a power plant comprising the stored energy power supply of any one of the third aspects.
In a sixth aspect, the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing the steps of the energy storage power supply control method according to any one embodiment of the first aspect when executing the program stored in the memory.
In a seventh aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the stored energy power supply control method according to any one of the embodiments of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the energy storage power supply control method provided by the embodiment of the application comprises the following steps: acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information; determining the type of the input power supply according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input; and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to charge and discharge control logic corresponding to the input power supply type. The method can determine the type of the input power source connected with the input end of the energy storage power source according to the signal updating state, thereby providing possibility for the energy storage power source to be configured with only one input end, saving the cost and reducing the occupation of the internal space of the product.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an energy storage power supply according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an energy storage power supply according to another embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a method for controlling an energy storage power supply according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an energy storage power supply control device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
The reference numerals are as follows:
10-an energy storage unit; 11-a controller; 12-a power bus; 13-isolating the boosting inversion module;
101-a bidirectional direct current-to-direct current module; 102-an energy storage battery;
201-a photovoltaic cell panel; 202-a power distribution network voltage source; 203-isolating a buck rectifier module; 204-output load.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
A first embodiment of the present application provides an energy storage power supply, as shown in fig. 1, including: the power bus 12, the controller 11 and at least one group of energy storage units 10 are isolated, and the energy storage units 10 comprise a bidirectional direct current-to-direct current module 101 and an energy storage battery pack 102.
The first end of the power bus 12 is connected with the input end of an energy storage power supply, the input end of the energy storage power supply is used for being connected with a photovoltaic cell panel 201 or a power distribution network voltage source 202, the second end of the power bus 12 is connected with the first end of a bidirectional direct current-to-direct current module 101, the second end of the bidirectional direct current-to-direct current module 101 is connected with an energy storage battery pack 102, the third end of the power bus 12 is connected with the first end of an isolation boosting inversion module 13, the second end of the isolation boosting inversion module 13 is used for being connected with an output load 204, and the controller 11 is connected with the control end of the bidirectional direct current-to-direct current module 101 so as to control the bidirectional direct current-to-direct current module to perform charge and discharge operations on the energy storage power supply.
The power distribution network voltage source 202, that is, the mains supply, because the scene that the energy storage power source uses the mains supply and the photovoltaic cell panel simultaneously hardly exists, in this embodiment, the input port of the energy storage power source equipment is reduced into one port from two ports, the front end connected to the power Bus is used together by the two paths of power sources of the power distribution network voltage source 202 and the photovoltaic cell panel 201, the photovoltaic cell panel 201 or the power distribution network voltage source 202 can be connected as required, one port of the energy storage power source equipment is reduced, the cost of the input port is reduced, and the layout of the equipment panel of the energy storage power source is more flexible. In addition, the function of controlling the input power of the photovoltaic cell panel 201 is realized by controlling the bidirectional direct current-to-direct current module 101 by the controller, so that the direct current boosting topology of the port connection of the photovoltaic cell panel 201 is omitted, the internal space of the device is saved, and the cost is reduced.
In this embodiment, the controller 11 may control the energy storage power supply to be in the charging mode or the discharging mode to perform the charging and discharging operation according to the control of the bidirectional dc-dc conversion module 101, and may, of course, also determine whether the input port is connected to the photovoltaic panel 201 or the connected power distribution network voltage source 202 according to the control of the bidirectional dc-dc conversion module 101, and a specific control method is described in detail in the following method embodiments.
When the input power source type is the input of the power distribution network voltage source, the input end of the energy storage power source is connected with the output end of the isolation buck rectifying module, and the input end of the isolation buck rectifying module is connected with the power distribution network voltage source. When the input power source type is photovoltaic cell panel input, the input end of the energy storage power source is connected with the junction box of the photovoltaic cell panel.
It should be appreciated that this embodiment reduces one output port and one dc boost topology of the energy storage power supply, so that the probability of device failure is reduced, and the reliability of the energy storage power supply is improved.
In one embodiment, as shown in fig. 2, at least one group of energy storage units comprises one master energy storage unit and at least one slave energy storage unit. The secondary energy storage unit comprises a secondary bidirectional direct current-to-direct current module and a secondary energy storage battery pack, and the primary bidirectional direct current-to-direct current module and the secondary bidirectional direct current-to-direct current module are in communication connection.
In this embodiment, the energy storage unit may be two, three or more, for example, to include one master energy storage unit and one slave energy storage unit.
The main bidirectional direct current-to-direct current module and the auxiliary bidirectional direct current-to-direct current module are in communication connection, so that the energy storage expansion function of the equipment can be increased, the energy storage level of the energy storage power supply is improved, and when one of the energy storage units fails, the energy storage power supply can still be normally used, and the failure rate can be reduced.
In this embodiment, the controller may control the energy storage distribution of the master energy storage battery pack and the slave energy storage battery pack, and may control the input power or the output power of the master bidirectional dc-dc conversion module and/or control the input power or the output power of the slave bidirectional dc-dc conversion module, without limitation.
In one embodiment, the controller 11 is further connected to the control terminal of the isolated boost inverter module 13, so that the controller 11 determines the input power type of the input terminal of the energy storage power by controlling the duty ratio of the switching tube in the isolated boost inverter module 13 or the bidirectional dc-dc conversion module 101.
In this embodiment, the controller 11 may control the duty ratio of the switching tube in the isolated boost inversion module 13 to be adjusted according to a preset adjustment rule, the input powers of the first ends of the power buses 12 corresponding to different duty ratios are different, the input powers of the first ends of the power buses 12 under the respective duty ratios are collected, and it may be determined that the input ports of the energy storage power supply are connected to the photovoltaic panel 201 or the power distribution network voltage source 202.
Of course, by controlling the duty ratio of the switching tube in the bidirectional dc-dc conversion module 101, the description is omitted.
In one embodiment, an isolated boost inversion module includes: an isolation unit and a boost inversion unit.
The connection relationship is as follows: the first end of the isolation unit is connected with the third end of the power bus, the second end of the isolation unit is connected with the first end of the boost inversion unit, and the second end of the boost inversion unit is used as the second end of the isolation boost inversion module.
In one embodiment, the bi-directional dc-to-dc module comprises: the feedback circuit, the control unit and the buck-boost circuit.
The connection relationship is as follows: the first end of the feedback circuit is connected with the second end of the power bus to sample the input voltage; the second end of the feedback circuit is connected with the control unit; the controller controls the step-up and step-down circuit through the control unit according to the sampled input voltage so as to execute charge and discharge operation on the energy storage battery pack.
In this embodiment, the feedback circuit samples the input voltage at the second end of the power bus, and controls the buck-boost circuit according to the sampled input voltage, so as to perform charge and discharge operations on the energy storage battery pack. The buck-boost circuit may be a buck-boost chopper circuit.
Based on the same technical concept, a second embodiment of the present application provides a method for controlling an energy storage power supply, where the method is applicable to any one of the energy storage power supplies in the first embodiment, as shown in fig. 3, and the method includes:
step 301, acquiring an input power signal based on preset input control information; determining a signal update state of an input power supply signal in a target control period; the target control period is an information update period corresponding to the input control information.
The input power signal, i.e., the signal input from the energy storage power input, may be collected from the first end of the power bus without limitation.
In one embodiment, before the input power signal is acquired based on the preset input control information, the method further includes: acquiring a preset adjustment rule of a switching tube; the switching tube is configured in a bidirectional direct current-to-direct current module or an isolated boosting inversion module; the duty ratio of the switching tube is adjusted according to a preset adjustment rule, and the duty ratio of the switching tube is used as input control information;
correspondingly, based on preset input control information, acquiring an input power supply signal comprises: the power value of the first end of the power bus at different duty ratios is obtained, and the power value is used as an input power supply signal.
In this embodiment, the duty ratio of the switching tube in the bidirectional dc-dc conversion module may be adjusted, and the duty ratio of the switching tube in the isolation boost inversion module may be adjusted, so that power values corresponding to different switching ratios may be obtained at the first end of the power bus.
In a specific embodiment, the preset adjustment rule may be to control the duty cycle of the switching tube to be adjusted in preset steps in a target control period. Specifically, an adjustment interval of the duty cycle may be set, for example, the duty cycle may be increased from 0% to 95% in a step of 1%, the duty cycle may be increased from 0% to 95% as a target control period (or may also be referred to as a cycle), at this time, the adjustment interval of the duty cycle is 0-95%, the collected power values may be stored in the input_array, for example, in a key value pair form, one duty cycle corresponds to one power value, control over the switching tube may be stopped after one cycle is collected, and several cycles of data may be collected more, so that errors are reduced, and accuracy of data analysis is improved.
Step 302, determining the type of the input power supply according to the signal update state; the input power types include photovoltaic panel inputs and power distribution network voltage source inputs.
The photovoltaic cell panel input and the power distribution network voltage source input respectively have the following characteristics:
the photovoltaic cell panel has different output power corresponding to different output impedance, the output impedance increases along with the gradual increase of the output impedance, and a peak value of maximum power exists, and the output impedance starts to gradually decrease after passing through the maximum peak value.
The power distribution network voltage source, the output power and the output impedance are positively correlated, and the maximum impedance voltage source protection is exceeded.
In one embodiment, determining the input power type based on the signal update status includes:
and determining the input power supply type as the power distribution network voltage source input under the condition that the signal update state indicates that the input power supply signal linearly grows in the target control period.
If the signal update status indicates that the input power signal does not linearly increase within the target control period, at least two determination methods are included as follows.
In the first case, the input power type can be directly determined to be the photovoltaic panel input.
In the second case, a first power supply signal corresponding to the maximum value of the input control information is obtained from the input power supply signals, and a second power supply signal is obtained from the input power supply signals, wherein the second power supply signal is the maximum value of the input power supply signals in a target control period;
When the signal update state indicates that the input power supply signal and the input control information are positively correlated in a preset interval and the ratio of the first power supply signal to the second power supply signal is smaller than a preset threshold value, determining that the input power supply type is photovoltaic panel input; the preset threshold is smaller than one and larger than zero; the maximum value of the input control information in the preset interval is smaller than or equal to the input control information corresponding to the second power supply signal.
In this embodiment, taking the input power signal as the power value for illustration, the duty cycle increases from 0% to 95% in 1% steps, and the acquired power value may be stored in the Inpower_array Array. When the power values in the Array Inpower_array increase linearly relative to the duty cycle, then the input source is the input of the power distribution network voltage source.
If the power value in the Array of power_array exceeds the preset interval, the duty cycle continues to increase, the power value reaches the maximum value when the duty cycle is at the target, and then the power value decreases along with the continuous increase of the duty cycle, that is, the second power signal corresponds to the target duty cycle, and the first power signal corresponds to the maximum value of the duty cycle of 95%. At this time, when the power value in the Array of the plurality of power_arrays increases along with the increase of the duty ratio in the preset interval, and the corresponding first power signal is smaller than 90% of the second power signal when the duty ratio is 95%, the input source is the input of the photovoltaic panel.
It should be noted that, the preset threshold value of 90% is only illustrated herein, and does not represent any further limitation on the preset threshold value, and in fact, the preset threshold value may be adjusted in advance according to the accessed photovoltaic panel, for example, the preset threshold value is set to other values of 80%, 85%, 95%, etc., without limitation. The preset interval can be set to 10% -50% or 20% -60% or other intervals, and the maximum value of the preset interval is only required to be smaller than the target duty ratio, and the interval range is not particularly limited.
Step 303, according to the charge-discharge control logic corresponding to the input power type, controlling the bidirectional dc-dc conversion module to perform charge-discharge operation on the energy storage power supply.
The charge and discharge operations may correspond to a charge mode, a discharge mode, and a standby mode (neither charge nor discharge) of the energy storage power supply. In the charging mode, the charging power of the energy storage battery pack and the output power output to the output load through the power bus can be controlled, and in the discharging mode, the discharging power of the energy storage battery pack can be controlled, and then the output power output to the output load through the power bus can be controlled.
In one embodiment, before the bidirectional direct current-to-direct current module is controlled to perform the charge-discharge operation on the energy storage power supply according to the charge-discharge control logic corresponding to the input power supply type, the method further includes: acquiring first power information of an energy storage battery pack in an energy storage unit; acquiring second power information of an output load; the second power information is smaller than or equal to rated output power of the output load; the sum of the first power information and the second power information is used as output power control information.
Correspondingly, according to charge-discharge control logic corresponding to the input power supply type, the bidirectional direct current-to-direct current module is controlled to execute charge-discharge operation on the energy storage power supply, and the method comprises the following steps: and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to the charge and discharge control logic corresponding to the output power control information and the input power supply type.
In this embodiment, the first power information of the energy storage battery pack is the maximum input power allowed by the energy storage battery pack during charging, the second power information of the output load is the actual power of the output load during operation, it should be understood that the actual power of the output load is less than or equal to the rated output power (i.e. rated power), when the load does not operate, the actual power is zero, and the output power control information is the maximum input power allowed to be input by the input end of the energy storage power supply.
If the input power source type is photovoltaic cell panel input, the charge-discharge control logic corresponding to the photovoltaic cell panel input is a maximum power point tracking mode, the maximum power point tracking mode is used for tracking the maximum input power of the photovoltaic cell panel, and the bidirectional direct current-to-direct current conversion module is controlled to execute charge-discharge operation on the energy storage power source according to the output power control information and the charge-discharge control logic corresponding to the input power source type, and the charge-discharge control module comprises the following steps:
Under the condition that the input power of the power supply corresponding to the photovoltaic cell panel is larger than the output power control information, the bidirectional direct current-to-direct current conversion module is limited to execute charge and discharge operation on the energy storage power supply;
and under the condition that the power input power of the photovoltaic cell panel is smaller than or equal to the output power control information, controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to the maximum power point tracking mode.
The limiting the bidirectional direct current to direct current module to perform charging and discharging operations on the energy storage power supply may be controlling the bidirectional direct current to direct current module to enter a power limiting mode, and in the power limiting mode, the upper limit of the power input by the photovoltaic cell panel is output power control information.
The maximum power point tracking (Maximum Power Point Tracking, abbreviated as MPPT) mode can track the maximum power point of the photovoltaic cell panel, so that the photovoltaic cell panel can be input into an energy storage power supply according to the maximum power.
If the current input power of the photovoltaic cell panel is larger than the output power control information, the current input power of the photovoltaic cell panel can be limited through an MPPT mode for protecting the energy storage power supply and the output load, and if the current input power is smaller than the output power control information, the photovoltaic cell panel can be enabled to input according to the maximum power through the MPPT.
In this embodiment, the following is exemplified:
for example, power information (i.e., first Power information) that the energy storage battery pack needs to be charged (i.e., BMS) may be obtained through a battery management system (Battery Management System), and an output Load is detected as a power_load (0 is less than or equal to the power_load is less than or equal to rated output Power), where the sum of the power_request and the power_load is output Power control information, that is, a maximum Power limit value of an input end of the energy storage Power supply; the voltage of the power Bus can be clamped by the energy storage battery pack, and the type of the input power supply is determined according to the input power supply signal.
When the input source is a photovoltaic cell panel, the bidirectional direct current-to-direct current module starts to operate in an MPPT mode, and when the maximum input Power Power_PVMax > Power_Requestcharge+Power_Load of the input source photovoltaic panel, the MPPT of the bidirectional direct current-to-direct current module enters a Power limiting mode, namely the input power=Power_Requestcharge+Power_Load of the photovoltaic panel is limited.
When the maximum input Power Power_PVMax of the photovoltaic cell panel MPPT is less than or equal to Power_RequestCharge+Power_load, the bidirectional direct current-direct current conversion module operates according to an MPPT mode.
In one embodiment, the energy storage power supply may include at least two sets of energy storage units, such that the energy storage power supply includes one master energy storage unit and one slave energy storage unit.
The method comprises the steps of obtaining Power information Power_RequestCharge1 needed to be charged by a main energy storage battery pack and Power information Power_RequestCharge2 needed to be charged by a slave energy storage battery pack through a BMS, and detecting that an output Load is Power_Load (power_Load is not more than 0 and not more than rated output Power), wherein the sum of the Power_RequestCharge1, the Power_RequestCharge2 and the Power_Load is output Power control information, namely the maximum Power limit value of an input end of an energy storage Power supply; the voltage of the power Bus can be clamped by the master energy storage battery pack and the slave energy storage battery pack together, and the input power type is determined according to the input power signal.
When the input source is a photovoltaic cell panel, the MPPT of the bidirectional direct current-to-direct current module starts to operate in an MPPT mode, and when the maximum input Power of the MPPT of the photovoltaic panel is Power_PVMax > Power_Requestcharge1+Power_Requestcharge2+Power_Load, the MPPT of the bidirectional direct current-to-direct current module enters into a Power limiting mode, namely, the input Power of the photovoltaic panel is limited
＝Power_Requestcharge1+Power_Requestcharge2+Power_Load。
When the maximum input Power Power_PVMax of the MPPT of the photovoltaic cell panel is less than or equal to
When Power_Requestcharge1+Power_Requestcharge2+Power_Load, the bidirectional DC-DC conversion module operates according to the MPPT mode.
It should be noted that the energy storage power source including two sets of energy storage units is only illustrated herein, and the energy storage power source may include one set, two sets, three sets, and more sets of energy storage units, which is not limited.
If the input power source type is the power distribution network voltage source input, the charge and discharge control logic corresponding to the power distribution network voltage source input is the voltage source control logic, and the bidirectional direct current-to-direct current conversion module is controlled to execute charge and discharge operation on the energy storage power source according to the output power control information and the charge and discharge control logic corresponding to the input power source type, and the method comprises the following steps:
and controlling the power input power corresponding to the power distribution network voltage source to be matched with the output power control information according to the voltage source control logic, and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply based on the power input power and the output power control information corresponding to the power distribution network voltage source.
In this embodiment, when the input source is a Power distribution network voltage source, the bidirectional dc-dc conversion module limits the input of the Power distribution network voltage source according to the sum of the power_requestcharge and the power_load.
In particular, the voltage input power of the distribution network voltage source is kept equal to the output power control information.
When the output Load Power_Load changes or the first Power information Power_RequestCharge changes or both changes, so that the output Power control information changes, the voltage input Power of the Power distribution network voltage source changes synchronously, and the voltage input Power of the Power distribution network voltage source is always equal to the output Power control information.
In the above embodiments, by setting an input end and saving a dc boost topology, the generation cost is saved, the internal structural space of the energy storage power supply is saved, the reliability of the product in theory is increased, the input source type is detected more accurately than the traditional voltage method by controlling the duty ratio, in addition, the energy storage unit can be expanded, the energy storage level of the energy storage power supply is improved, meanwhile, the diversity of the product is also improved, and the failure rate can be reduced.
Based on the same technical concept, a third embodiment of the present application provides an energy storage power supply control device, as shown in fig. 4, where the device includes:
an input power signal acquisition module 401, configured to acquire an input power signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
an input power type determining module 402, configured to determine an input power type according to the signal update status; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
and the charge-discharge control module 403 is configured to control the bidirectional dc-dc conversion module to perform charge-discharge operation on the energy storage power supply according to the charge-discharge control logic corresponding to the input power supply type.
As shown in fig. 5, a fourth embodiment of the present application provides an electronic device including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, the memory 113 perform communication with each other through the communication bus 114,
a memory 113 for storing a computer program;
in one embodiment, the processor 111 is configured to implement the energy storage power supply control method provided in any one of the foregoing method embodiments when executing the program stored in the memory 113, and the method includes:
acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
determining the type of the input power supply according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to charge and discharge control logic corresponding to the input power supply type.
The communication bus mentioned by the above terminal may be a peripheral component interconnect standard (Peripheral Component Interconnect, abbreviated as PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated as EISA) bus, etc. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.
The communication interface is used for communication between the terminal and other devices.
The memory may include random access memory (Random Access Memory, RAM) or non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.
The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but also digital signal processors (Digital Signal Processing, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field-programmable gate arrays (Field-Programmable Gate Array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
The fifth embodiment of the present application further provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the energy storage power supply control method provided in any one of the method embodiments described above.
The sixth embodiment of the present application also provides a generator comprising any of the energy storage power sources of the first embodiment.
The seventh embodiment of the present application also provides a power plant comprising any of the energy storage power sources of the first embodiment.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. In the description, suffixes such as "module", "part" or "unit" used for representing elements are used only for facilitating the description of the present application, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for controlling an energy storage power supply, the method comprising:
acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
determining the type of the input power supply according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to charge and discharge control logic corresponding to the input power supply type.
2. The method of claim 1, wherein prior to obtaining the input power signal based on the preset input control information, the method further comprises:
acquiring a preset adjustment rule of a switching tube; the switching tube is configured in the bidirectional direct current-direct current module or the isolated boosting inversion module;
the duty ratio of the switching tube is adjusted according to the preset adjustment rule, and the duty ratio of the switching tube is used as the input control information;
based on preset input control information, the obtaining the input power signal includes:
and acquiring power values of the first end of the power bus at different duty ratios, and taking the power values as the input power supply signals.
3. The method of claim 1, wherein said determining an input power type based on said signal update status comprises:
determining that the input power supply type is a power distribution network voltage source input under the condition that the signal update state indicates that the input power supply signal linearly grows in the target control period;
acquiring a first power supply signal corresponding to the maximum value of the input control information from the input power supply signal, and acquiring a second power supply signal from the input power supply signal, wherein the second power supply signal is the maximum value of the input power supply signal in the target control period;
When the signal update state indicates that the input power supply signal and the input control information are positively correlated in a preset interval, and the ratio of the first power supply signal to the second power supply signal is smaller than a preset threshold value, determining that the input power supply type is photovoltaic panel input; the preset threshold is smaller than one and larger than zero; and the maximum value of the input control information in the preset interval is smaller than or equal to the input control information corresponding to the second power supply signal.
4. The method of claim 1, wherein before the bidirectional dc to dc module is controlled to perform the charging and discharging operations on the energy storage power supply according to the charging and discharging control logic corresponding to the input power supply type, the method further comprises:
acquiring first power information of an energy storage battery pack in an energy storage unit;
acquiring second power information of an output load; the second power information is smaller than or equal to rated output power of the output load;
taking the sum of the first power information and the second power information as output power control information;
correspondingly, the controlling the bidirectional direct current to direct current module to perform charge and discharge operations on the energy storage power supply according to the charge and discharge control logic corresponding to the input power supply type comprises the following steps:
And controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to the output power control information and charge and discharge control logic corresponding to the input power supply type.
5. The method according to claim 4, wherein if the input power type is a photovoltaic panel input, the charge and discharge control logic corresponding to the photovoltaic panel input is a maximum power point tracking mode, the maximum power point tracking mode is used for tracking the maximum input power of the photovoltaic panel, and the controlling the bidirectional dc-dc conversion module to perform the charge and discharge operation on the energy storage power supply according to the output power control information and the charge and discharge control logic corresponding to the input power type includes:
under the condition that the input power of the power supply corresponding to the photovoltaic cell panel is larger than the output power control information, the bidirectional direct current-to-direct current module is limited to perform charge and discharge operation on the energy storage power supply;
and under the condition that the power input by the photovoltaic cell panel is smaller than or equal to the output power control information, controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply according to the maximum power point tracking mode.
6. The method of claim 4, wherein if the input power type is a power distribution network voltage source input, the charge and discharge control logic corresponding to the power distribution network voltage source input is a voltage source control logic, and the controlling the bidirectional dc-dc conversion module to perform the charge and discharge operation on the energy storage power supply according to the output power control information and the charge and discharge control logic corresponding to the input power type comprises:
and controlling the power input power corresponding to the power distribution network voltage source to be matched with the output power control information according to the voltage source control logic, and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply based on the power input power corresponding to the power distribution network voltage source and the output power control information.
7. An energy storage power supply control device, characterized in that the device comprises:
the input power supply signal acquisition module is used for acquiring an input power supply signal based on preset input control information; determining a signal update state of the input power supply signal within a target control period; the target control period is an information update period corresponding to the input control information;
The input power supply type determining module is used for determining the input power supply type according to the signal updating state; the input power supply type comprises photovoltaic cell panel input and power distribution network voltage source input;
and the charge-discharge control module is used for controlling the bidirectional direct current-to-direct current module to execute charge-discharge operation on the energy storage power supply according to charge-discharge control logic corresponding to the input power supply type.
8. An energy storage power supply, characterized by applying the energy storage power supply control method according to any one of claims 1 to 6, comprising: the power bus is connected with the power bus and the controller; the energy storage unit comprises a bidirectional direct current-to-direct current module and an energy storage battery pack;
the first end of the power bus is connected with the input end of the energy storage power supply; the input end of the energy storage power supply is used for connecting a photovoltaic cell panel or a power distribution network voltage source;
the second end of the power bus is connected with the first end of the bidirectional direct current-to-direct current module, and the second end of the bidirectional direct current-to-direct current module is connected with the energy storage battery pack;
the third end of the power bus is connected with the first end of the isolation boosting inversion module, and the second end of the isolation boosting inversion module is used for being connected with an output load;
The controller is connected with the control end of the bidirectional direct current-direct current module; and controlling the bidirectional direct current-to-direct current module to execute charge and discharge operation on the energy storage power supply.
9. The electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the steps of the energy storage power supply control method according to any one of claims 1 to 6 when executing a program stored on a memory.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the energy storage power supply control method according to any one of claims 1-6.
CN202310244136.6A 2023-03-13 2023-03-13 Energy storage power supply control method and device, energy storage power supply and storage medium Pending CN116316727A (en)

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