CN115967154A - Energy storage power supply system and control method based on energy storage power supply system - Google Patents
Energy storage power supply system and control method based on energy storage power supply system Download PDFInfo
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- CN115967154A CN115967154A CN202310118898.1A CN202310118898A CN115967154A CN 115967154 A CN115967154 A CN 115967154A CN 202310118898 A CN202310118898 A CN 202310118898A CN 115967154 A CN115967154 A CN 115967154A
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Abstract
The embodiment of the invention provides an energy storage power supply system and a control method based on the energy storage power supply system, wherein the energy storage power supply system comprises: the system comprises an alternating current energy storage converter, a direct current energy storage converter and a battery management module; the alternating current energy storage converter is characterized in that an alternating current input end of the alternating current energy storage converter is connected with a power grid, an output end of the alternating current energy storage converter is respectively connected with a first alternating current load and a second alternating current load, and the priority of the first alternating current load is higher than that of the second alternating current load; the input end of the direct current energy storage converter is connected with the photovoltaic cell panel, and the output end of the direct current energy storage converter is connected with the direct current load; the direct-current energy storage converter is connected with the alternating-current energy storage converter through the battery management module, so that when a power grid fails, uninterrupted power-down operation of a load is realized, key load equipment is guaranteed not to be stopped, data are not lost, and efficient utilization of a power supply system is realized.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to an energy storage power supply system and a control method based on the energy storage power supply system.
Background
With the development of society, the demand of industrial power utilization and residential power utilization is increasing day by day, and the problem of power supply tension is prominent particularly in peak power utilization periods. With the adjustment of the state on the energy structure, the development of new energy is supported greatly, the rapid development of microgrid technology and battery echelon utilization is realized, and the peak clipping and valley filling of the smart power grid are realized by using the smart power grid consisting of an energy storage system and a photovoltaic power generation system.
In specific application, if a power grid fails, the load is powered off, and the power grid cannot operate normally, so that data is lost, and efficient utilization of a power supply system cannot be realized.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are proposed to provide an energy storage and power supply system and a control method based on the energy storage and power supply system that overcome or at least partially solve the above problems.
A first aspect of an embodiment of the present invention provides an energy storage and power supply system, where the energy storage and power supply system includes: the system comprises an alternating current energy storage converter, a direct current energy storage converter and a battery management module; the alternating current energy storage converter is characterized in that an alternating current input end of the alternating current energy storage converter is connected with a power grid, an output end of the alternating current energy storage converter is respectively connected with a first alternating current load and a second alternating current load, and the priority of the first alternating current load is higher than that of the second alternating current load;
the input end of the direct current energy storage converter is connected with the photovoltaic cell panel, and the output end of the direct current energy storage converter is connected with a direct current load;
and the direct current energy storage converter is connected with the alternating current energy storage converter through the battery management module.
A second aspect of the embodiments of the present invention provides a control method based on an energy storage and power supply system, which is applied to the energy storage and power supply system of the first aspect, and the method includes:
under the condition of power grid fault interruption, the alternating current energy storage converter is switched to an off-grid operation mode, the alternating current energy storage converter is disconnected with the power grid, and the battery management module is adopted to respectively supply power to the first alternating current load and the second alternating current load; and the direct current energy storage converter is adopted to supply power to the direct current load.
Optionally, under the condition that the current remaining capacity of the battery management module is smaller than a first preset value and the current remaining capacity cannot enable the first ac load and the second ac load to operate, the ac energy storage converter disconnects a load switch of the second ac load, and the dc energy storage converter transmits the energy collected by the photovoltaic cell panel to the first ac load through the battery management module to supply power to the first ac load.
Optionally, the method further comprises:
under the condition that a power grid is on line, the alternating current energy storage converter works in a current source mode and respectively supplies power to the first alternating current load and the second alternating current load;
and under the condition that the energy collected by the photovoltaic cell panel is greater than a second preset value, the direct-current energy storage converter supplies power to the direct-current load.
Optionally, the method further comprises:
when the residual electric quantity of the battery management module is larger than a third preset value and a power grid is normal, the alternating-current energy storage converter works in a current source mode, and the alternating-current energy storage converter obtains the output power of the direct-current energy storage converter and the actual power of the photovoltaic cell panel; and determining a control strategy of the output power according to the output power and the actual power.
Optionally, the control strategy includes at least: during peak power, the alternating current energy storage converter controls the battery management module to discharge, and redundant electric quantity is fed back to a power grid;
and/or
During valley electricity, the alternating current energy storage converter controls the battery management module to charge so that the battery management module supplements energy.
Optionally, the method further comprises:
under the condition that the power grid is interrupted due to faults, the alternating current energy storage converter is switched to an off-grid operation mode, and when the current electric quantity of the battery management module is larger than a fourth preset value, the alternating current energy storage converter judges the actual power of the photovoltaic cell panel;
and if the actual power is greater than a fifth preset value, the direct-current energy storage converter supplies power to the direct-current load.
Optionally, the method further comprises:
and under the condition that the residual electric quantity of the battery management module is smaller than the sixth preset value, and the sixth preset value is smaller than the first preset value, the alternating current energy storage converter controls the direct current energy storage converter to be disconnected with the direct current load, and the alternating current energy storage converter supplies power to the first alternating current load.
Optionally, the method further comprises:
when the first alternating current load, the second alternating current load and the direct current load are suddenly interrupted, the alternating current energy storage converter controls the direct current energy storage converter to charge the battery management module;
and after the battery management module finishes charging, adjusting the output power of the photovoltaic cell panel.
The embodiment of the invention has the following advantages:
the embodiment of the invention provides an energy storage power supply system and a control method based on the energy storage power supply system, wherein the energy storage power supply system comprises: the system comprises an alternating current energy storage converter, a direct current energy storage converter and a battery management module; the alternating current energy storage converter comprises an alternating current energy storage converter, a first alternating current load, a second alternating current load and a second alternating current load, wherein the alternating current input end of the alternating current energy storage converter is connected with a power grid; the input end of the direct current energy storage converter is connected with the photovoltaic cell panel, and the output end of the direct current energy storage converter is connected with the direct current load; the direct-current energy storage converter is connected with the alternating-current energy storage converter through the battery management module, so that when a power grid fails, uninterrupted power-down operation of a load is realized, key load equipment is guaranteed not to be stopped, data are not lost, and efficient utilization of a power supply system is realized.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an energy storage and power supply system according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of an energy storage and power supply system of the present invention;
FIG. 3 is a schematic structural diagram of another embodiment of an energy storage and power supply system of the present invention;
FIG. 4 is a schematic structural diagram of another embodiment of the energy storage and power supply system of the present invention;
fig. 5 is a schematic structural diagram of another embodiment of the energy storage and power supply system of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1, a schematic structural diagram of an embodiment of an energy storage power supply system according to the present invention is shown, where the energy storage power supply system includes: the system comprises an alternating current energy storage converter 101, a direct current energy storage converter 102 and a battery management module 103; the alternating current input end of the alternating current energy storage converter is connected with a power grid 104, the output end of the alternating current energy storage converter is respectively connected with a first alternating current load 105 and a second alternating current load 106, and the priority of the first alternating current load is higher than that of the second alternating current load;
the input end of the direct current energy storage converter is connected with the photovoltaic cell panel 107, and the output end of the direct current energy storage converter is connected with the direct current load 108;
the dc energy storage converter 102 is connected to the ac energy storage converter 101 via a battery management module 103.
The invention provides an energy storage and power supply system, which comprises an alternating current energy converter, a direct current energy storage converter, a photovoltaic cell panel PV and a cell system (a cell management module);
the AC input end of the AC energy storage converter is connected with a power grid, the DC input end is connected with a battery system, the AC output end 1 is connected with a key AC load 1 (a first AC load), and the AC output end 2 is connected with a common AC load 2 (a second AC load);
the direct current input end of the direct current energy storage converter is connected with a photovoltaic cell panel PV, the direct current output end 1 is connected with a cell system, and the direct current output end 2 is connected with a direct current load; the alternating current converter is in communication connection with the direct current converter; as shown in fig. 2.
As shown in fig. 4, an embodiment of the present invention provides a control method based on an energy storage and power supply system, which is applied to the energy storage and power supply system, and the method includes:
under the condition of power grid fault interruption, the alternating current energy storage converter is switched to an off-grid operation mode, the alternating current energy storage converter is disconnected with the power grid, and a battery management module is adopted to respectively supply power to a first alternating current load and a second alternating current load; and a direct-current energy storage converter is adopted to supply power to a direct-current load.
When the power grid is interrupted due to a fault, the alternating-current energy storage converter is automatically switched into an off-grid operation mode, meanwhile, the alternating-current energy storage converter is disconnected from an SCR (selective catalytic reduction) switch of the power grid, a battery system supplies power to a key alternating-current load and a common alternating-current load through alternating-current energy storage conversion, and the direct-current energy storage converter outputs power to a direct-current load so as to realize the uninterrupted power supply of the load;
as shown in fig. 5, under the condition that the current remaining power of the battery management module is less than the first preset value and the current remaining power cannot enable the first ac load and the second ac load to operate, the ac energy storage converter turns off the load switch of the second ac load, and the dc energy storage converter transmits the energy collected by the photovoltaic cell panel to the first ac load through the battery management module to supply power to the first ac load.
When the residual electric quantity of the battery system is lower than a certain value and is not enough to ensure that the key alternating current load runs for a long time, the alternating current energy storage converter disconnects a load switch of the common alternating current load, meanwhile, the direct current energy storage converter supplies power to the key alternating current load through the battery system, and the energy storage system realizes the most efficient energy utilization.
As shown in fig. 3, the method further comprises:
under the condition that a power grid is on line, the alternating current energy storage converter works in a current source mode and respectively supplies power to a first alternating current load and a second alternating current load;
and under the condition that the energy collected by the photovoltaic cell panel is greater than a second preset value, the direct-current energy storage converter supplies power to the direct-current load.
Specifically, when the power grid is on line, the alternating current energy storage converter works in a current source mode, the alternating current energy storage converter outputs power to a key alternating current load and a common alternating current load, when the PV energy of the photovoltaic cell panel is sufficient, the direct current energy storage converter outputs power to a direct current load, and redundant energy supplies power to an alternating current side load through a battery system; when the PV energy of the photovoltaic cell panel is insufficient, the energy of the power grid side supplies power to the direct-current load through the cell system;
optionally, the method further comprises:
under the condition that the residual electric quantity of the battery management module is larger than a third preset value and a power grid is normal, the alternating-current energy storage converter works in a current source mode, and the alternating-current energy storage converter obtains the output power of the direct-current energy storage converter and the actual power of a photovoltaic cell panel; and determining a control strategy of the output power according to the output power and the actual power.
Optionally, the control strategy comprises at least: during peak power, the alternating-current energy storage converter controls the battery management module to discharge, and redundant electric quantity is fed back to the power grid;
and/or
During the valley electricity period, the AC energy storage converter controls the battery management module to charge so that the battery management module supplements energy.
Specifically, according to the time that a key alternating current load needs to be kept when a power grid is disconnected, 50% of electric quantity of a battery system is reserved to be used as reserve energy, when the electric quantity of the battery system is larger than 50% and the power grid is normal, an alternating current energy storage converter works in a current source mode, the alternating current energy storage converter adjusts the power output of the alternating current energy storage converter and the actual power of a photovoltaic cell panel PV, the alternating current energy storage converter adjusts the control strategy during peak power, the battery system is enabled to discharge and operate, and redundant electric quantity is fed back to the power grid; during the valley power period, the alternating current converter adjusts a control strategy to enable the battery system to charge and run and supplement energy for the battery system; earn the difference between peak electricity and valley electricity, and simultaneously smooth the power of the power grid side, so that the power grid is always in a stable running state without sudden increase and sudden decrease;
optionally, the method further comprises:
under the condition of power grid fault interruption, the alternating current energy storage converter is switched to an off-grid operation mode, and when the current electric quantity of the battery management module is larger than a fourth preset value, the alternating current energy storage converter judges the actual power of the photovoltaic cell panel;
and if the actual power is greater than the fifth preset value, the direct-current energy storage converter supplies power to the direct-current load.
When the power grid is interrupted due to faults, the alternating current energy storage converter is automatically switched to an off-grid operation mode, when the electric quantity of the battery system is larger than 80%, the alternating current energy storage converter judges the actual power of the photovoltaic cell panel PV, the direct current converter supplies power to a direct current load, the alternating current energy storage converter simultaneously supplies power to a key alternating current load and a common alternating current load, and simultaneously judges the residual electric quantity of the battery system and the actual power of the photovoltaic cell panel PV, when the residual electric quantity of the battery system is smaller than 50%, the alternating current energy storage converter continues to supply power to the key alternating current load, but a common alternating current load switch is disconnected, so that the long-time safe operation of the key alternating current load is ensured; when the residual electric quantity of the battery system is less than 30%, the alternating current energy storage converter controls the direct current energy storage converter to disconnect the direct current load, the alternating current energy storage converter continues to supply power to the key alternating current load, and therefore the key load equipment is guaranteed not to stop running, and data are not lost.
Optionally, the method further comprises:
and under the condition that the residual electric quantity of the battery management module is smaller than a sixth preset value, and the sixth preset value is smaller than the first preset value, the alternating current energy storage converter controls the direct current energy storage converter to be disconnected with the direct current load, and the alternating current energy storage converter supplies power to the first alternating current load.
Optionally, the method further comprises:
when the first alternating current load, the second alternating current load and the direct current load are suddenly interrupted, the alternating current energy storage converter controls the direct current energy storage converter to charge the battery management module;
and after the battery management module finishes charging, adjusting the output power of the photovoltaic battery panel.
When the load is suddenly interrupted, the alternating current energy storage converter coordinates the direct current energy storage converter to preferentially charge the battery system, after charging is completed, the output power of the photovoltaic cell panel PV is limited, the maximum utilization of energy is realized, and the light abandoning problem of new energy is reduced.
The energy storage and power supply system of the embodiment of the invention realizes peak clipping and valley filling of the smart grid and smoothes the power of the side of the smart grid; when the power grid fails, uninterrupted power-down operation of the load is realized, key load equipment is guaranteed not to be stopped, data is not lost, and efficient utilization of a power supply system is realized; the light abandoning phenomenon of the energy storage system is avoided, and stable and efficient clean energy is provided for users.
The embodiment of the invention provides an energy storage power supply system and a control method based on the energy storage power supply system, wherein the energy storage power supply system comprises: the system comprises an alternating current energy storage converter, a direct current energy storage converter and a battery management module; the alternating current energy storage converter comprises an alternating current energy storage converter, a first alternating current load, a second alternating current load and a second alternating current load, wherein the alternating current input end of the alternating current energy storage converter is connected with a power grid; the input end of the direct current energy storage converter is connected with the photovoltaic cell panel, and the output end of the direct current energy storage converter is connected with the direct current load; the direct-current energy storage converter is connected with the alternating-current energy storage converter through the battery management module, so that when a power grid fails, uninterrupted power-down operation of a load is realized, key load equipment is guaranteed not to be stopped, data are not lost, and efficient utilization of a power supply system is realized.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, electronic devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing electronic device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing electronic device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing electronic devices to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing electronic device to cause a series of operational steps to be performed on the computer or other programmable electronic device to produce a computer implemented process such that the instructions which execute on the computer or other programmable electronic device provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "include", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or electronic device including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article, or electronic device. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional like elements in the process, method, article, or electronic device in which the element is included.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. An energy storage and power supply system, comprising: the system comprises an alternating current energy storage converter, a direct current energy storage converter and a battery management module; the alternating current energy storage converter is characterized in that an alternating current input end of the alternating current energy storage converter is connected with a power grid, an output end of the alternating current energy storage converter is respectively connected with a first alternating current load and a second alternating current load, and the priority of the first alternating current load is higher than that of the second alternating current load;
the input end of the direct current energy storage converter is connected with the photovoltaic cell panel, and the output end of the direct current energy storage converter is connected with a direct current load;
the direct current energy storage converter is connected with the alternating current energy storage converter through the battery management module.
2. A control method based on an energy storage power supply system, which is applied to the energy storage power supply system of claim 1, and comprises the following steps:
under the condition of power grid fault interruption, the alternating current energy storage converter is switched to an off-grid operation mode, the alternating current energy storage converter is disconnected with the power grid, and the battery management module is adopted to respectively supply power to the first alternating current load and the second alternating current load; and the direct current energy storage converter is adopted to supply power to the direct current load.
3. The energy-storage power supply system based control method according to claim 2, wherein in a case that a current remaining power of the battery management module is smaller than a first preset value and the current remaining power cannot operate the first ac load and the second ac load, the ac energy-storage converter turns off a load switch of the second ac load, and the dc energy-storage converter transmits the energy collected by the photovoltaic panel to the first ac load through the battery management module to supply power to the first ac load.
4. The energy storage power supply system based control method according to claim 2, wherein the method further comprises:
under the condition that a power grid is on line, the alternating current energy storage converter works in a current source mode and respectively supplies power to the first alternating current load and the second alternating current load;
and under the condition that the energy collected by the photovoltaic cell panel is greater than a second preset value, the direct-current energy storage converter supplies power to the direct-current load.
5. The energy storage power supply system based control method according to claim 4, wherein the method further comprises:
when the residual electric quantity of the battery management module is larger than a third preset value and a power grid is normal, the alternating-current energy storage converter works in a current source mode, and the alternating-current energy storage converter obtains the output power of the direct-current energy storage converter and the actual power of the photovoltaic cell panel; and determining a control strategy of the output power according to the output power and the actual power.
6. The energy storage power supply system based control method according to claim 5, wherein the control strategy at least comprises: during peak power, the alternating-current energy storage converter controls the battery management module to discharge, and redundant electric quantity is fed back to a power grid;
and/or
During valley electricity, the alternating current energy storage converter controls the battery management module to charge so that the battery management module supplements energy.
7. The energy storage power supply system based control method according to claim 2, wherein the method further comprises:
under the condition that the power grid is interrupted due to faults, the alternating current energy storage converter is switched to an off-grid operation mode, and when the current electric quantity of the battery management module is larger than a fourth preset value, the alternating current energy storage converter judges the actual power of the photovoltaic cell panel;
and if the actual power is larger than a fifth preset value, the direct current energy storage converter supplies power to the direct current load.
8. The energy storage power supply system based control method according to claim 3, wherein the method further comprises:
and under the condition that the residual electric quantity of the battery management module is smaller than the sixth preset value, and the sixth preset value is smaller than the first preset value, the alternating current energy storage converter controls the direct current energy storage converter to be disconnected with the direct current load, and the alternating current energy storage converter supplies power to the first alternating current load.
9. The energy storage power supply system based control method according to claim 2, wherein the method further comprises:
when the first alternating current load, the second alternating current load and the direct current load are suddenly interrupted, the alternating current energy storage converter controls the direct current energy storage converter to charge the battery management module;
and after the battery management module finishes charging, adjusting the output power of the photovoltaic cell panel.
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