CN113852066A - Energy storage battery low-power-consumption control method and energy storage power supply system - Google Patents

Energy storage battery low-power-consumption control method and energy storage power supply system Download PDF

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Publication number
CN113852066A
CN113852066A CN202111138797.8A CN202111138797A CN113852066A CN 113852066 A CN113852066 A CN 113852066A CN 202111138797 A CN202111138797 A CN 202111138797A CN 113852066 A CN113852066 A CN 113852066A
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China
Prior art keywords
energy storage
module
power
storage battery
direct current
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Pending
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CN202111138797.8A
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Chinese (zh)
Inventor
曾云洪
李伟进
那科
樊廷峰
杨玉兵
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202111138797.8A priority Critical patent/CN113852066A/en
Publication of CN113852066A publication Critical patent/CN113852066A/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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/08—Three-wire systems; Systems having more than three wires
    • H02J1/084—Three-wire systems; Systems having more than three wires for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
    • 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
    • H02J15/00—Systems for storing electric 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • 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
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors

Abstract

The invention discloses a low-power-consumption control method of an energy storage battery and an energy storage power supply system. The method is applied to an energy storage and power supply system, the energy storage and power supply system comprises an energy storage battery, a DC/DC module, a power module and a battery management system, the energy storage battery is connected with a load through the DC/DC module and a direct current bus in sequence, the power module is respectively connected with the energy storage battery, the DC/DC module and the battery management system, the method is characterized in that the power module is also connected with the direct current bus, the energy storage and power supply system further comprises a current detection module, and the method comprises the following steps: after the DC/DC module outputs electric energy to the direct current bus, acquiring a direct current bus current value of the energy storage and power supply system; and switching the energy storage battery or the direct current bus to supply power to the power supply module according to the current value of the direct current bus. According to the invention, the unnecessary consumption of the electric energy of the energy storage battery can be avoided, and the utilization rate of the energy storage battery is improved.

Description

Energy storage battery low-power-consumption control method and energy storage power supply system
Technical Field
The invention relates to the technical field of electronic power, in particular to a low-power-consumption control method of an energy storage battery and an energy storage power supply system.
Background
Under the current overall requirements of carbon neutralization and carbon peak-to-peak, the application proportion of clean energy is getting larger and larger, the photovoltaic is used as clean energy and provides important guarantee for carbon neutralization, and the energy storage battery is used as an energy storage unit of photovoltaic power generation and plays an important role in a clean energy system. As an energy storage unit, the energy storage battery has the problem that the energy charging and discharging utilization rate cannot reach 100%, for example, the energy storage battery is charged by 10kWh and is finally discharged by only 8kWh, one part of the reasons is low power protection of the energy storage battery and cannot be completely discharged, and the other part of the reasons is operation power consumption of a control component of an energy storage power supply system, so that the whole energy storage power supply system has internal power consumption, and further the electric energy utilization rate of the energy storage battery is reduced.
Aiming at the problem that the control part of the energy storage power supply system in the prior art has running power consumption, so that the electric energy utilization rate of the energy storage battery is low, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a low-power-consumption control method of an energy storage battery and an energy storage power supply system, and aims to solve the problem that the electric energy utilization rate of the energy storage battery is low due to the fact that a control component of the energy storage power supply system in the prior art runs power consumption.
In order to solve the technical problem, the invention provides a low-power-consumption control method for an energy storage battery, which is applied to an energy storage power supply system, wherein the energy storage power supply system comprises an energy storage battery, a DC/DC module, a power supply module and a battery management system, the energy storage battery is connected with a load through the DC/DC module and a direct current bus in sequence, the power supply module is respectively connected with the energy storage battery, the DC/DC module and the battery management system, the low-power-consumption control method is characterized in that the power supply module is also connected with the direct current bus, the energy storage power supply system further comprises a current detection module, and the method comprises the following steps:
after the DC/DC module outputs electric energy to the direct current bus, acquiring a direct current bus current value of the energy storage and power supply system;
and switching the energy storage battery or the direct current bus to supply power to the power supply module according to the current value of the direct current bus.
Further, switching the energy storage battery or the dc bus to supply power to the power module according to the current value of the dc bus includes:
judging whether the current value of the direct current bus meets a first preset condition or not;
if so, controlling the direct current bus to supply power to the power supply module;
and if not, controlling the energy storage battery to supply power to the power supply module.
Further, the first preset condition is that:
the current value of the direct current bus is smaller than a preset current value; the preset current value is determined according to a first direct current bus current value and a second direct current bus current value;
the first direct current bus current value is a direct current bus current value when the direct current bus supplies power to the power supply module and the output power of the DC/DC module is zero; the second direct current bus current value is the direct current bus current value when the energy storage battery supplies power for the power supply module and the output power of the DC/DC module is zero.
Further, the determining the preset current value according to the first dc bus current value and the second dc bus current value includes:
the preset current value is equal to the difference between the second direct current bus current value and the first direct current bus current value.
Further, after the direct current bus is controlled to supply power to the power module, the method further includes:
judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not;
and if so, controlling the direct current bus to start charging the energy storage battery.
Further, after the energy storage battery is controlled to supply power to the power module, the method further includes:
judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not;
and if so, controlling the direct current bus to start charging the energy storage battery.
The invention also provides an energy storage and power supply system, which comprises an energy storage battery, a DC/DC module, a power supply module and a battery management system, wherein the energy storage battery is connected with a load through the DC/DC module and the DC bus in sequence; the battery management system is also used for switching the energy storage battery or the direct current bus to supply power to the power module according to the current value of the direct current bus.
Further, the energy storage and power supply system further comprises:
and the first switch is arranged between the energy storage battery and the power supply module and used for controlling the on-off of the energy storage battery and the power supply module.
Further, the energy storage and power supply system further comprises:
and the manual switch is connected with the first switch in parallel and used for manually controlling the energy storage battery to supply power to the power supply module.
Further, the energy storage and power supply system further comprises:
and the second switch is arranged between the direct current bus and the power module and used for controlling the on-off of the direct current bus and the power module.
Further, the energy storage and power supply system further comprises:
and the third switch is arranged between the energy storage battery and the DC/DC module and is used for controlling the connection and disconnection between the energy storage battery and the DC/DC module.
Further, the energy storage and power supply system further comprises:
and the charging circuit comprises a fourth switch and a first resistor which are arranged in series, and is arranged between the energy storage battery and the DC/DC module and used for controlling whether the energy storage battery charges the DC/DC module or not.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the above-described energy storage battery low power consumption control method.
By applying the technical scheme of the invention, the current value of the direct current bus of the energy storage power supply system is obtained, the energy storage battery or the direct current bus is switched to supply power to the power module according to the current value of the direct current bus, and the direct current bus can be switched to supply power to the power module under the condition of low load, so that the unnecessary consumption of the electric energy of the energy storage battery can be avoided, and the utilization rate of the energy storage battery is improved.
Drawings
Fig. 1 is a block diagram of an energy storage and power supply system according to the related art;
FIG. 2 is a block diagram of an energy storage and supply system according to an embodiment of the invention;
FIG. 3 is a flowchart of a method for controlling low power consumption of an energy storage battery according to an embodiment of the invention;
fig. 4 is a block diagram of an energy storage and supply system according to another embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the switches in embodiments of the present invention, the switches should not be limited to these terms. These terms are only used to distinguish between switches disposed in different positions. For example, a first switch may also be referred to as a second switch, and similarly, a second switch may also be referred to as a first switch, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a low power consumption control method for an energy storage battery 1, which is applied to an energy storage power supply system, fig. 1 is a structural diagram according to the existing energy storage power supply system, as shown in fig. 1, the existing energy storage power supply system includes an energy storage battery 1, a DC/DC module 2, a power module 3, and a battery management system 4, the energy storage battery 1 sequentially passes through the DC/DC module 2 and a DC bus to connect to a load 5, the power module 3 is respectively connected to the energy storage battery 1, the DC/DC module 2, and the battery management system 4, the energy storage power supply system further includes a power grid, the power grid is connected to the DC/DC module 2 through the AC/DC module to output electric energy to the DC bus to supply power to the load 5, in the energy storage power supply system, the battery management system 4 needs to control charging and discharging of the energy storage battery 1 through a control component, and the energy storage battery 1 is connected to the power module 3, all the above operations need to consume a part of electric energy, which is the internal power consumption of the energy storage and power supply system, in the above energy storage system, the internal power consumption is provided by the energy storage battery 1, so the internal power consumption will reduce the electric energy utilization rate of the energy storage battery 1. Under the condition that the load of the load 5 is low, the electric energy of the direct current bus is sufficient, so that the power module 3 can be considered to be supplied with power through the direct current bus, the power consumption of the energy storage battery 1 is reduced, and the utilization rate of the energy storage battery 1 is improved. Based on the above conception, an energy storage power supply system is provided, fig. 2 is a structural diagram of the energy storage power supply system according to the embodiment of the present invention, and as shown in fig. 2, on the basis of the existing energy storage power supply system, the power supply module 3 is further connected to a direct current bus, and the energy storage power supply system further includes a current detection module 6.
The embodiment also provides a low power consumption control method for an energy storage battery, and fig. 3 is a flowchart of the low power consumption control method for the energy storage battery according to the embodiment of the present invention, as shown in fig. 3, the low power consumption control method for the energy storage battery includes:
s101, after the DC/DC module outputs electric energy to the direct current bus, acquiring a direct current bus current value of the energy storage and power supply system.
And S102, switching an energy storage battery or a direct current bus to supply power to the power module according to the current value of the direct current bus.
According to the low-power-consumption control method for the energy storage battery, the direct-current bus current value of the energy storage power supply system is obtained, the energy storage battery or the direct-current bus is switched to supply power to the power module according to the direct-current bus current value, the direct-current bus can be switched to supply power to the power module under the condition of low load, the electric energy of the energy storage battery can be prevented from being unnecessarily consumed, and the utilization rate of the energy storage battery is improved.
Example 2
This embodiment provides another energy storage battery low-power consumption control method, and direct current bus current can reflect, in order to realize switching power supply of power module according to the load of load, switches energy storage battery or direct current bus according to the direct current bus current value and supplies power for power module, includes: judging whether the current value of the direct current bus meets a first preset condition or not; if so, indicating that the load of the load is very low, and controlling the direct-current bus to supply power to the power supply module so as to reduce the power consumption of the energy storage battery; if not, the load of the load is high, and the energy storage battery is controlled to supply power to the power supply module. Wherein the first preset condition is as follows: the current value of the direct current bus is smaller than a preset current value; wherein the preset current value is determined according to the first direct current bus current value I1 and the second direct current bus current value I2. The first direct current bus current value I1 is a direct current bus current value when the direct current bus supplies power for the power supply module and the output power of the DC/DC module is zero; the second direct current bus current value I2 is a direct current bus current value when the energy storage battery supplies power for the power supply module and the output power of the DC/DC module is zero. The preset current value is equal to the difference between the second dc bus current value I2 and the first dc bus current value I1. In specific implementation, after the energy storage system is powered on, the energy storage battery is controlled to be connected with the DCDC module and the power supply module, meanwhile, the DC/DC module does not output current to the outside, the current value of the bus is detected and marked as a first direct current bus current I1; and controlling the energy storage battery and the DCDC module to be disconnected, the energy storage battery and the power module to be disconnected, the direct current bus and the power module to be connected, detecting the current value of the bus current, marking the current value as a second direct current bus current value I2, and calculating to obtain a preset current value Ik which is I2-I1.
When the electric quantity of the energy storage battery is lower than a certain value, the energy storage battery needs to be charged, and therefore, after the direct-current bus is controlled to supply power to the power module, the method further comprises the following steps: judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not; if so, indicating that the electric quantity of the energy storage battery is insufficient, and controlling the direct current bus to start charging the energy storage battery; if not, the electric quantity of the energy storage battery is normal, and the direct current bus is continuously controlled to supply power to the power supply module.
Similarly, after the energy storage battery is controlled to supply power to the power module, the method further includes: judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not; if the direct current bus is not in the normal state, the energy storage battery is continuously controlled to supply power to the power module.
Example 3
The embodiment provides an energy storage and power supply system, as shown in fig. 1 mentioned above, the energy storage and power supply system includes an energy storage battery 1, a DC/DC module 2, a power module 3, and a battery management system 4, where the energy storage battery 1 sequentially passes through the DC/DC module 2 and a DC bus to connect to a load 5, the power module 3 is respectively connected to the energy storage battery 1, the DC/DC module 2, and the battery management system 4, the power module 3 is further connected to the DC bus, and the energy storage and power supply system further includes a current detection module 6 for obtaining a current value of the DC bus of the energy storage and power supply system; the battery management system 4 is further configured to switch the energy storage battery 1 or the dc bus to supply power to the power module 3 according to the current value of the dc bus.
The energy storage power supply system of this embodiment switches energy storage battery 1 or dc bus according to the dc bus current value and supplies power for power module 3 through obtaining the dc bus current value of energy storage power supply system, under the lower circumstances of load 5 load, can switch the dc bus and supply power for power module 3, can avoid energy storage battery 1's electric energy to consume unnecessarily, improves energy storage battery 1's utilization ratio.
Example 4
In this embodiment, another energy storage and power supply system is provided, and fig. 4 is a structural diagram of an energy storage and power supply system according to another embodiment of the present invention, in order to switch a power supply of the power module 3, as shown in fig. 4, the energy storage and power supply system further includes: and the first switch K1 is arranged between the energy storage battery 1 and the power module 3 and used for controlling the on-off between the energy storage battery 1 and the power module 3. And the manual switch S is connected with the first switch K1 in parallel and used for manually controlling the energy storage battery 1 to supply power to the power module 3, and when the manual switch S is manually pressed down in specific implementation, the energy storage battery 1 supplies power to the power module 3. And the second switch K2 is arranged between the direct current bus and the power module 3 and used for controlling the on-off between the direct current bus and the power module 3.
When the electric quantity of the energy storage battery 1 is lower than a certain value, the energy storage battery 1 needs to be charged, at this time, the energy storage battery 1 needs to be conducted with the DC/DC module 2, and when the energy storage battery 1 supplies power to the DC bus, the energy storage battery 1 needs to be conducted with the DC/DC module 2, so that the energy storage power supply system further comprises: and the third switch K3 is arranged between the energy storage battery 1 and the DC/DC module 2 and is used for controlling the connection and disconnection between the DC/DC module 2 and the energy storage battery 1 during charging.
Because there is a bus capacitor (not shown in the figure) in the DC/DC module 2, the bus capacitor needs to be charged before supplying power to the load 5, and therefore, the energy storage and supply system further includes: the charging circuit 7 comprises a fourth switch K4 and a first resistor R1 which are arranged in series, and the charging circuit 7 is arranged between the energy storage battery 1 and the DC/DC module 2 and is used for controlling whether the energy storage battery 1 charges the DC/DC module 2.
In order to realize the unidirectional conduction of current, a diode D is further arranged between the dc bus and the power module 3, and is used for controlling the current to flow to the power module 3 only from the dc bus.
In order to realize the overload, short circuit and under-voltage protection functions, as shown in fig. 4, a first circuit breaker QF1 is arranged between the energy storage battery 1 and the power module 3, and a second circuit breaker QF2 is further arranged between the dc bus and the power module 3.
In order to realize the unidirectional conduction of current, a diode is also arranged between the direct current bus and the power module and used for controlling the current to flow to the power module only from the direct current bus.
The control flow of the energy storage and power supply system of the embodiment is as follows:
and S1, the energy storage battery is powered on, the battery management system controls the third switch K3 and the first switch K1 to be closed, meanwhile, the DC/DC module is controlled not to output electric energy outwards, and the current detection module obtains the current value of the direct current bus and marks the current value as a first direct current bus current value I1.
And S2, the power management system controls the second switch K2 to be closed and the first switch K1 to be opened, the current detection module obtains the current direct current of the direct current bus and marks the current value as a second direct current bus current value I2, after the current value is detected, the first switch K1 is controlled to be closed and the second switch K2 is controlled to be opened, the current detection module transmits the current values I1 and I2 to the battery management system through CAN communication, and the battery management system calculates a preset current value Ik which is I2-I1.
S3, the DC/DC module opens the output power, outputs current to the DC bus, detects the bus current value I in real time, and transmits the DC bus current value to the battery management system through the CAN bus;
and S4, the battery management system performs low power consumption control according to the current value of the direct current bus and the battery power.
State 1: when I is less than or equal to Ik and the electric quantity of the battery is more than 10%, the energy storage battery does not need to output current to the direct current bus, the battery management system controls the second switch K2 to be closed, and controls the first switch K1 and the third switch K3 to be opened, so that the energy storage battery does not discharge outwards;
state 2: when I is less than or equal to Ik and the electric quantity of the battery is less than or equal to 10%, at the moment, the energy storage system needs to be charged, the battery management system controls the third switch K3 to be closed, controls the second switch K2 to be closed, and switches the first switch K1 off, so that the DC/DC module starts to charge the energy storage battery;
state 3: when I is larger than Ik and the electric quantity of the battery is larger than 10%, the energy storage battery needs to output current to the direct current bus, and the battery management system controls the third switch K3 and the first switch K1 to be closed and controls the second switch K2 to be opened;
and 4: when I is larger than Ik and the electric quantity of the battery is smaller than or equal to 10%, at the moment, the energy storage battery needs to be charged, the battery management system controls the third switch K3 to be closed, controls the second switch K2 to be closed, and controls the first switch K1 to be opened, so that the DC/DC module starts to charge the energy storage battery.
In this embodiment, the battery management system communicates with the DC/DC module through the CAN bus, acquires the current value of the DC bus through communication, and controls the energy storage battery to be turned on or off according to the current value of the DC bus, so that the energy storage battery is connected to the grid, and the power consumption of the energy storage battery is minimized when the load has no power demand.
The above-described system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (13)

1. The energy storage battery low-power consumption control method is applied to an energy storage power supply system, the energy storage power supply system comprises an energy storage battery, a DC/DC module, a power module and a battery management system, the energy storage battery is connected with a load through the DC/DC module and a direct current bus in sequence, the power module is respectively connected with the energy storage battery, the DC/DC module and the battery management system, the energy storage battery low-power consumption control method is characterized in that the power module is also connected with the direct current bus, the energy storage power supply system further comprises a current detection module, and the method comprises the following steps:
after the DC/DC module outputs electric energy to the direct current bus, acquiring a direct current bus current value of the energy storage and power supply system;
and switching the energy storage battery or the direct current bus to supply power to the power supply module according to the current value of the direct current bus.
2. The method of claim 1, wherein switching the energy storage battery or the dc bus to power the power module according to the dc bus current value comprises:
judging whether the current value of the direct current bus meets a first preset condition or not;
if so, controlling the direct current bus to supply power to the power supply module;
and if not, controlling the energy storage battery to supply power to the power supply module.
3. The method according to claim 2, wherein the first preset condition is:
the current value of the direct current bus is smaller than a preset current value; the preset current value is determined according to a first direct current bus current value and a second direct current bus current value;
the first direct current bus current value is a direct current bus current value when the direct current bus supplies power to the power supply module and the output power of the DC/DC module is zero; the second direct current bus current value is the direct current bus current value when the energy storage battery supplies power for the power supply module and the output power of the DC/DC module is zero.
4. The method of claim 3, wherein the predetermined current value is determined from a first DC bus current value and a second DC bus current value, comprising:
the preset current value is equal to the difference between the second direct current bus current value and the first direct current bus current value.
5. The method of claim 2, wherein after controlling the dc bus to power the power module, the method further comprises:
judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not;
and if so, controlling the direct current bus to start charging the energy storage battery.
6. The method of claim 2, wherein after controlling the energy storage battery to supply power to the power module, the method further comprises:
judging whether the electric quantity of the energy storage battery is smaller than or equal to a preset threshold value or not;
and if so, controlling the direct current bus to start charging the energy storage battery.
7. An energy storage power supply system comprises an energy storage battery, a DC/DC module, a power supply module and a battery management system, wherein the energy storage battery is connected with a load through the DC/DC module and a direct current bus in sequence; the battery management system is also used for switching the energy storage battery or the direct current bus to supply power to the power module according to the current value of the direct current bus.
8. The energy-storage power supply system according to claim 7, further comprising:
and the first switch is arranged between the energy storage battery and the power supply module and used for controlling the on-off of the energy storage battery and the power supply module.
9. The energy-storage power supply system according to claim 8, further comprising:
and the manual switch is connected with the first switch in parallel and used for manually controlling the energy storage battery to supply power to the power supply module.
10. The energy-storage power supply system according to claim 7, further comprising:
and the second switch is arranged between the direct current bus and the power module and used for controlling the on-off of the direct current bus and the power module.
11. The energy-storage power supply system according to claim 7, further comprising:
and the third switch is arranged between the energy storage battery and the DC/DC module and is used for controlling the connection and disconnection between the energy storage battery and the DC/DC module.
12. The energy-storage power supply system according to claim 7, further comprising:
and the charging circuit comprises a fourth switch and a first resistor which are arranged in series, and is arranged between the energy storage battery and the DC/DC module and used for controlling whether the energy storage battery charges the DC/DC module or not.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
CN202111138797.8A 2021-09-27 2021-09-27 Energy storage battery low-power-consumption control method and energy storage power supply system Pending CN113852066A (en)

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Application Number Priority Date Filing Date Title
CN202111138797.8A CN113852066A (en) 2021-09-27 2021-09-27 Energy storage battery low-power-consumption control method and energy storage power supply system

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