CN113572267A - Energy storage device - Google Patents

Energy storage device Download PDF

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Publication number
CN113572267A
CN113572267A CN202110834220.4A CN202110834220A CN113572267A CN 113572267 A CN113572267 A CN 113572267A CN 202110834220 A CN202110834220 A CN 202110834220A CN 113572267 A CN113572267 A CN 113572267A
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CN
China
Prior art keywords
energy storage
unit
charging
interface
subsystem
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Pending
Application number
CN202110834220.4A
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Chinese (zh)
Inventor
王成武
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Shenzhen Xihe Future Technology Co ltd
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Shenzhen Xihe Future Technology Co ltd
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Priority to CN202110834220.4A priority Critical patent/CN113572267A/en
Publication of CN113572267A publication Critical patent/CN113572267A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention provides an energy storage device comprising: a parent system and a subsystem; wherein, the subsystem and the mother system are in disconnectable connection; the subsystem and the parent system are used for: receiving and storing first electric energy converted from solar energy; when the power grid is connected, receiving second electric energy transmitted by the power grid; outputting a supply power based on the stored electrical energy; when the subsystem is connected with the mother system, the power supply output by the subsystem and the mother system can be parallel and then is transmitted to the load connection node and/or the standby power connection node; when the connection of the subsystem and the mother system is disconnected, the subsystem can be used as a mobile power supply and independently transmits power to the load connection node, and the power of the mother system can be independently transmitted to the standby power connection node. According to the invention, through the system design of the parallel operation of the main system and the sub-systems, the portable energy source use scene and the off-grid storage scene of the user are integrated into an integral whole machine.

Description

Energy storage device
Technical Field
The invention relates to the technical field of energy storage, in particular to energy storage equipment.
Background
Recently, household photovoltaic demand is increasing, environmental protection and carbon neutralization policy are called, and energy storage end products of consumers become core products of low-carbon life of users. In addition, along with the discrete residential form of overseas markets, the power grid coverage is incomplete, and the influence of extreme weather environment, domestic energy storage products can well cope with relevant scenes.
As the industry develops, the following problems remain:
(1) in the life scene of a user, the portable scenes such as the outdoor scene, the personal studio and the like are abundant, and an independent portable power supply is needed for power supply;
(2) in the industry, portable energy storage and household energy storage are two types of products, and the cost is high.
Disclosure of Invention
The invention provides energy storage equipment, which aims to solve the problem that household energy storage and portable energy storage in the prior art are two types of products and cannot be fused with each other.
The present invention provides an energy storage device, comprising: a parent system and a subsystem; wherein the content of the first and second substances,
the subsystem and the mother system are in disconnectable connection; the separated subsystems can be used as portable energy storage power supplies for supplying power outdoors;
the subsystem and the mother system are in disconnectable connection;
the subsystem and the parent system are both used for:
receiving and storing first electric energy converted from solar energy;
when the power grid is connected, receiving second electric energy transmitted by the power grid;
outputting a supply power based on the stored electrical energy;
wherein:
when the subsystem is connected with the mother system, the power supply output by the subsystem and the mother system can be parallel and then is transmitted to a load connection node and/or a standby power connection node;
when the connection between the sub-system and the mother system is disconnected, the sub-system can separately transmit power to the load connection node, and the power of the mother system can separately transmit power to the standby power connection node.
Preferably, the parent system comprises: the photovoltaic energy storage system comprises a first photovoltaic panel, a first control unit, a first charge and discharge unit and a first energy storage unit; wherein the content of the first and second substances,
the first charge and discharge unit includes: the solar energy power generation system comprises a first DC input end, at least one first communication interface, a first DC interface, a first bidirectional inverter and a first solar energy controller;
the first AC input end of the first side of the first bidirectional inverter is used for connecting the power grid; the first AC output end of the first side of the first bidirectional inverter is used for connecting the standby power connection node; the first bi-directional inverter second side is directly or indirectly connected to the first DC interface; the controlled end of the first bidirectional inverter is also connected with the first control unit through the first communication interface so as to be controlled by the first control unit;
the first solar controller is connected between the first DC input and the first DC interface; the controlled end of the first solar controller is also connected to the first control unit through the first communication interface;
the first photovoltaic panel is connected with a first DC input end of the first charging and discharging unit;
the first control unit is respectively connected with the first energy storage unit and the first communication interface of the first charging and discharging unit;
the first energy storage unit is directly or indirectly connected with the first DC interface of the first charging and discharging unit.
Preferably, the parent system comprises: a first circuit breaker and/or a second circuit breaker; wherein the content of the first and second substances,
the first circuit breaker is connected with the first AC output end to realize the connection protection of the home loop;
the second circuit breaker is connected between the first energy storage unit and the DC interface of the first charging and discharging unit, and system starting protection is achieved.
Preferably, the parent system further comprises: the first direct current bus control contactor is used for protecting a direct current circuit;
the first direct current bus control contactor is connected between the first energy storage unit and a first DC interface of the first charging and discharging unit.
Preferably, the subsystem comprises: the photovoltaic energy storage system comprises a second photovoltaic panel, a second control unit, a second charge and discharge unit and a second energy storage unit; wherein the content of the first and second substances,
the second charge and discharge unit includes: the second DC input end, at least one second communication interface, a second DC interface, a second bidirectional inverter and a second solar controller;
the second AC input end of the first side of the second bidirectional inverter is used for connecting a power grid; a second AC output of a first side of the second bidirectional inverter for connection to the load connection node; the second bi-directional inverter second side is directly or indirectly connected to the second DC interface; the controlled end of the second bidirectional inverter is also connected with the second control unit through the second communication interface so as to be controlled by the second control unit;
the second solar controller is connected between the second DC input and the second DC interface; the controlled end of the second solar controller is also connected to the second control unit through the second communication interface;
the second photovoltaic panel is connected with a second DC input end of the second charging and discharging unit;
the second control unit is respectively connected with the second energy storage unit and a second communication interface of the second charging and discharging unit; the second control unit is also connected with the first control unit;
the second energy storage unit is directly or indirectly connected with a second DC interface of the second charging and discharging unit;
the first DC interface of the first charging and discharging unit is in disconnectable connection with the second DC interface of the second charging and discharging unit;
the first AC output end of the first charging and discharging unit is in disconnectable connection with the second AC output end of the second charging and discharging unit.
Preferably, the operation mode of the first bidirectional inverter can be changed under the control of the first control unit, the operation mode of the second bidirectional inverter can be changed under the control of the second control unit, and the operation modes at least include:
the bidirectional inverter in the first mode can invert the electric energy of the energy storage unit connected to the second side and then output the electric energy to the AC output end of the first side;
the bidirectional inverter in the second mode can convert the electric energy received by the AC input end of the first side and then charge the energy storage unit connected with the second side;
and in the third mode, the bidirectional inverter in the third mode can supply the electric energy received by the AC input end of the second side to the AC output end of the second side and convert the redundant electric energy to charge the energy storage unit connected with the first side.
Preferably, the subsystem further comprises: the second direct current bus control contactor is used for direct current circuit protection;
and the second direct current bus control contactor is connected between the second energy storage unit and a second DC interface of the second charging and discharging unit.
Preferably, the subsystem is connected with the mother system through at least one contactor.
Preferably, the at least one contactor comprises: the direct current parallel machine control contactor and the alternating current load parallel machine control contactor are arranged on the base; wherein the content of the first and second substances,
the direct current parallel operation control contactor comprises: the first direct current parallel machine control contactor and the second direct current parallel machine control contactor;
the parallel operation control contactor for the alternating current load comprises: the first alternating current load parallel operation control contactor and the second alternating current load parallel operation control contactor are connected in parallel;
the first end of the first direct current parallel operation control contactor is connected with the first DC interface of the first charging and discharging unit, the first end of the second direct current parallel operation control contactor is connected with the second DC interface of the second charging and discharging unit, and the second end of the first direct current parallel operation control contactor is in disconnectable connection with the second end of the second direct current parallel operation control contactor;
the first end of the first alternating current load parallel operation control contactor is connected with the first AC output end of the first charging and discharging unit, the first end of the second alternating current load parallel operation control contactor is connected with the second AC output end of the second charging and discharging unit, and the second end of the first alternating current load parallel operation control contactor is in disconnectable connection with the second end of the second alternating current load parallel operation control contactor.
Preferably, the parent system and/or the subsystem are further configured to:
and when the power grid is connected, storing at least part of the second electric energy transmitted by the power grid.
Preferably, the parent system and/or the subsystem are further configured to:
when the power grid is connected, outputting power supply based on the stored electric energy in a preset power grid wave crest period;
and when the power grid is connected, at least part of the second electric energy transmitted by the power grid is received and stored in a preset power grid trough period.
The energy storage device provided by the invention has the advantages that the subsystem and the mother system which can be disconnected are connected, the subsystem is simply hot-plugged, and the separated subsystem can be used as a portable mobile power supply of a high-power electric appliance, such as: the power of high-power electrical appliances such as electric saws, electric drills and the like in the outdoors, kitchens and personal workrooms can also be used as a mobile power supply for consuming digital data such as mobile phones and the like; in addition, the electric energy is parallelly connected and output to the standby power equipment through the subsystem and the mother system, so that high-power parallel operation is realized; the portable energy source using scene and the off-network storage scene of the user are integrated into a whole machine.
According to the energy storage equipment provided by the invention, electric energy is parallelly output to the standby power equipment through the subsystem and the mother system, the separated mother system outputs the electric energy to the standby power equipment, the whole system (the subsystem and the mother system) or the separated mother system can be high in capacity, and 4kW/2KW high power is output to store energy for families.
In the alternative scheme of the invention, the whole household energy storage device is used as a household energy storage device, a UPS (uninterrupted power supply) standby function is provided through the bidirectional inverter, 10ms seamless switching can be realized, intelligent power standby is realized, and the household emergency power failure can be dealt with.
In the alternative scheme of the invention, the stored electric energy is output at the peak power utilization time period set by the user, and the power grid charges the system at the trough time period at night, thereby bringing long economic benefit.
In the alternative scheme, the integral structure is simple and compact, the whole machine is designed in a light weight mode, and the weight and the size of the product are greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an energy storage device according to an embodiment of the invention;
fig. 2 is a schematic diagram of an energy storage device according to an embodiment of the invention.
Description of reference numerals:
1-a first photovoltaic panel, the first photovoltaic panel,
2-the first control unit is connected to the first control unit,
3-a first charge-discharge unit,
4-the first energy storage unit is provided with,
5-a second photovoltaic panel, the second photovoltaic panel,
6-a second control unit for controlling the second control unit,
7-a second charge-discharge unit,
8-the second energy storage unit is provided with,
9-a first dc bus control contactor,
10-a second dc bus control contactor,
11-first dc parallel control contactor,
12-second dc parallel contact controller,
13-first ac load parallel operation control contactor,
14-second ac load parallel operation control contactor,
15-the first circuit-breaker,
16-second circuit breaker.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, 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.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, "a plurality" means a plurality, e.g., two, three, four, etc., unless specifically limited otherwise.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and the like are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic diagram of an energy storage device according to an embodiment of the invention.
Referring to fig. 1, the energy storage device of the present embodiment includes: parent system and subsystem. Wherein, the subsystem and the mother system are in disconnectable connection. The separated subsystem can be used as a portable mobile energy storage power supply for supplying power to electric equipment.
The subsystem and the parent system are used for: receiving and storing first electric energy converted from solar energy; receiving second electric energy transmitted by the power grid, and feeding redundant second electric energy transmitted by the power grid back to the power grid; outputting a supply power based on the stored electrical energy;
wherein: when the subsystem and the mother system are connected, the power supply output by the subsystem and the mother system can be parallel and then transmitted to a Load connection node (Load) and/or a backup power connection node (Back-up).
When the connection of subsystem and mother's system breaks off, the subsystem can regard as portable power source, will supply power alone to carry to load connected node, if can regard as the power supply of 2kW to provide the power consumption of high-power electrical apparatus such as open air, kitchen, personal studio electric saw electric drill. The power supply of the parent system can be fed separately to the backup-up connection node (Back-up).
In one embodiment, the subsystem and the parent system are further used for storing electric energy transmitted from a power grid.
In one embodiment, a parent system comprises: a first photovoltaic panel 1, a first control unit 2, a first charging/discharging unit 3, and a first energy storage unit 4, please refer to fig. 2. Wherein the first charge and discharge unit 3 includes: the solar energy power generation system comprises a first DC input end, at least one first communication interface, a first DC interface, a first bidirectional inverter and a first solar energy controller; the first bidirectional inverter includes: a first AC input and a first AC output.
The solar controller (i.e., the first solar controller mentioned above and the second solar controller mentioned below) may be any circuit capable of processing the electric energy converted from the solar energy so as to make it suitable for storage, transmission and use.
The first AC input end of the first side of the first bidirectional inverter is used for connecting a Grid (Grid); the first AC output end of the first side of the first bidirectional inverter is used for being connected with a Back-up connection node (Back-up); the first bi-directional inverter second side is directly or indirectly connected to the first DC interface. The controlled end of the first bidirectional inverter is also connected with the first control unit 2 through a first communication interface so as to be controlled by the first control unit 2; the controlled end of the first solar controller is also connected to the first control unit through the first communication interface. The first charging and discharging unit 3 is used for charging the first AC input end by the power grid, performing AC-dc conversion and inputting and outputting on the power generation of the first photovoltaic panel 1 and the charging and discharging of the first energy storage unit 4. The first photovoltaic panel 1 is connected with a first DC input terminal of the first charge-discharge unit 3; the first photovoltaic panel 1 is used for receiving solar power generation and transmitting the solar power generation to the first charge and discharge unit 3. The first control unit 2 is respectively connected with the first energy storage unit 4 and the first communication interface of the first charging and discharging unit 3; the first control unit 2 is used to control the operating state of the parent system, which matches or is associated with the operating mode of the first bidirectional inverter mentioned below. The first energy storage unit 4 is connected to the first DC interface of the first charging and discharging unit 3.
In an embodiment, the operation mode of the first bidirectional inverter can be changed under the control of the first control unit 2, and the operation mode at least includes: a first operating mode (also understood as an inverter mode), a second operating mode (also understood as a charging mode), a third operating mode (also understood as a UPS mode). When the first bidirectional inverter is in the first working mode, the first bidirectional inverter is used for inverting the electric energy of the first energy storage unit 4 and outputting the electric energy to the second AC output end; when the first bidirectional inverter is in the second working mode, the first bidirectional inverter is used for converting the electric energy of the power grid and then charging the first energy storage unit 4; and when the first bidirectional inverter is in the third working mode, the first bidirectional inverter is used for supplying the electric energy of the power grid to the load connection node and converting the redundant electric energy to charge the first energy storage unit 4.
In a preferred embodiment, the first energy storage unit further includes a first battery monitoring and managing unit in addition to the battery. . The battery is directly or indirectly connected to the first DC interface, for example, the energy storage unit may further comprise a DC-DC converter, and the battery may be connected to the first DC interface via the DC-DC converter. The first battery monitoring and managing unit can be connected with the battery and/or the DC-DC converter, and can also be connected with the first control unit and used for intelligently managing the charge-discharge state, overcurrent, overcharge protection and the like of the battery.
The subsystem includes: a second photovoltaic panel 5, a second control unit 6, a second charging/discharging unit 7, and a second energy storage unit 8, please refer to fig. 2. Wherein the second charge and discharge unit 7 includes: the solar energy controller comprises a second DC input end, at least one second communication interface, a second DC interface, a second bidirectional inverter and a second solar energy controller. The second AC input end of the first side of the second bidirectional inverter is used for connecting a Grid (Grid); the second AC output end of the first side of the second bidirectional inverter is used for connecting a Load connection node (Load); the second side of the second bidirectional inverter is directly or indirectly connected to the second DC interface; the controlled end of the second bidirectional inverter is also connected with a second control unit 6 through a second communication interface so as to be controlled by the second control unit 6; the second solar controller is connected between the second DC input end and the second DC interface; the controlled end of the second solar controller is also connected to the second control unit 6 via a second communication interface. The second charging and discharging unit 7 is used for charging the second AC input end by the power grid, and performing AC-dc conversion and input and output on the power generation of the second photovoltaic panel 5 and the charging and discharging of the second energy storage unit 8. The second photovoltaic panel 5 is connected with a second DC input terminal of a second charging and discharging unit 7; the second photovoltaic panel 5 is used for receiving solar power generation and transmitting the solar power generation to the second charge and discharge unit 7. The second control unit 6 is respectively connected with the second energy storage unit 8 and the second communication interface of the second charging and discharging unit 7; the second control unit 6 is used to control the operating state of the subsystem, which matches or is associated with the operating mode of the second bidirectional inverter mentioned below. The second control unit 6 is also connected with the first control unit 2 and is used for realizing parallel operation communication between the main system and the subsystems. The second energy storage unit 8 is connected to the second DC interface of the second charging and discharging unit 7. The first DC interface of the first charging and discharging unit 3 is in disconnectable connection with the second DC interface of the second charging and discharging unit 7; the first AC output terminal of the first charging and discharging unit 3 and the second AC output terminal of the second charging and discharging unit 7 are disconnectable.
The operation mode of the second bidirectional inverter can be changed under the control of the second control unit 6, and the operation mode at least comprises: a first operating mode (also understood as an inverter mode), a second operating mode (also understood as a charging mode), a third operating mode (also understood as a UPS mode). When the second bidirectional inverter is in the first working mode, the second bidirectional inverter is used for inverting the electric energy of the second energy storage unit 8 and outputting the electric energy to the second AC output end; when the second bidirectional inverter is in the second working mode, the second bidirectional inverter is used for converting the electric energy of the power grid and then charging the second energy storage unit 8; and when the second bidirectional inverter is in the third working mode, the second bidirectional inverter is used for supplying the electric energy of the power grid to the load connection node and converting the redundant electric energy to charge the second energy storage unit 8.
In a preferred embodiment, the second energy storage unit further includes a second battery monitoring and managing unit in addition to the battery. The battery is directly or indirectly connected to the second DC interface, for example, the energy storage unit may further comprise a DC-DC converter, and the battery may be connected to the second DC interface via the DC-DC converter. The second battery monitoring and managing unit can be connected with the battery and/or the DC-DC converter, and can also be connected with the second control unit and used for intelligently managing the charge-discharge state, overcurrent, overcharge protection and the like of the battery.
In one embodiment, the first bi-directional inverter and/or the second bi-directional inverter are in a UPS mode, and the bi-directional inverter can directly send the AC input to the AC output, and can convert the excess power at the AC input to charge the energy storage unit.
When the power grid peak time is in a preset power grid peak time period, the first bidirectional inverter and/or the second bidirectional inverter enter an inversion mode, and the bidirectional inverter can invert the electric energy stored by the energy storage unit and then output the electric energy to an AC output end; in some schemes, the electric energy output to the AC output terminal may be completely derived from the electric energy stored in the corresponding energy storage unit, and in other schemes, the electric energy output to the AC output terminal may be partially derived from the electric energy stored in the corresponding energy storage unit and partially derived from the electric energy received by the AC input terminal;
when the power grid is in a preset power grid trough period, the first bidirectional inverter and/or the second bidirectional inverter enter a charging mode, and the bidirectional inverter converts electric energy input by the AC input end and then charges the energy storage unit; this process may be performed when it is determined that the corresponding energy storage unit is not fully charged;
when the power grid is in fault or disconnected, the first bidirectional inverter and/or the second bidirectional inverter enter an inversion mode, and the electric energy stored by the energy storage unit is inverted and then output to an AC output end to supply power to a Load (Load) and/or a Back-up (Back-up).
In one embodiment, the parent system further comprises: the first direct current bus controls the contactor 9 for direct current circuit protection. The first DC bus control contactor 9 is connected between the first energy storage unit 4 and the first DC interface of the first charging/discharging unit 3, please refer to fig. 2.
In one embodiment, the subsystem further comprises: the second dc bus controls the contactor 10 for dc circuit protection. The second DC bus control contactor 10 is connected between the second energy storage unit 8 and the first DC interface of the second charging/discharging unit 7, please refer to fig. 2.
In one embodiment, the subsystems are connected with the mother system through a contactor. Preferably, the contactor comprises: the direct current parallel machine control contactor and the alternating current load parallel machine control contactor are arranged on the base; the direct current parallel operation control contactor is used for battery connection protection of the subsystem and the mother system, and the alternating current load parallel operation control contactor is used for alternating current output protection. Direct current parallel operation control contactor includes: a first direct current parallel operation control contactor 11 and a second direct current parallel operation contact controller 12; the parallel operation control contactor of the alternating current load comprises: the first ac load parallel operation control contactor 13 and the second ac load parallel operation control contactor 14 are shown in fig. 1.
Wherein, the first end of the first DC parallel operation control contactor 11 is connected to the first DC interface of the first charging and discharging unit 3, and the first end of the second DC parallel operation control contactor 12 is connected to the second DC interface of the second charging and discharging unit 7. The second end of the first dc parallel operation control contactor 11 and the second end of the second dc parallel operation control contactor 12 are disconnectable, and after the first dc parallel operation control contactor 11 and the second dc parallel operation control contactor 12 are disconnected, the first dc parallel operation control contactor 11 and the second dc parallel operation control contactor 12 automatically protect the plug interface of the mother system and the plug interface of the subsystem.
A first terminal of the first AC load parallel operation control contactor 13 is connected to a first AC output terminal of the first charging and discharging unit 3, and a first terminal of the second AC load parallel operation control contactor 14 is connected to a second AC output terminal of the second charging and discharging unit 7. The second end of the first ac load parallel operation control contactor 13 and the second end of the second ac load parallel operation control contactor 14 are disconnectable, and after the first ac load parallel operation control contactor 13 and the second ac load parallel operation control contactor 14 are disconnected, the first ac load parallel operation control contactor and the second ac load parallel operation control contactor automatically protect the plug interface of the mother system and the plug interface of the subsystem.
In one embodiment, the parent system further comprises: a first circuit breaker 15 and a second circuit breaker 16. The first circuit breaker 15 is connected with a first AC output end to realize household loop connection protection; the second circuit breaker 16 is connected between the first energy storage unit 4 and the DC interface of the first charging and discharging unit 3, so as to implement system startup protection.
In a preferred embodiment, the mother system and/or the subsystem are used for outputting electric energy to the standby power equipment and/or the electric equipment in the peak period of the power grid according to a preset peak period and a preset valley period of the power grid, and storing the electric energy to the first energy storage unit and/or the second energy storage unit in the valley period of the power grid, so that peak power utilization setting and valley charging setting are realized, peak and valley power utilization price differences are saved, and long-term economic benefits are brought.
In a preferred embodiment, the grid-connected and off-grid switching module is integrated in the bidirectional inverter of the main system and the subsystem, so that 10ms seamless switching and intelligent power backup can be realized, a UPS power backup function is provided, and the emergency power failure of a family can be responded.
The energy storage device of the above embodiment may have three operation modes:
the portable subsystem is simple in hot plug, and can be used as a 2kW power supply to supply power to high-power electrical appliances such as outdoor electric saws, kitchens and electric drills in personal workrooms after separation, as shown in figure 2, after the subsystem is pulled out from a complete machine, a first alternating current Load parallel operation control contactor 13 and a second alternating current Load parallel operation control contactor 14 automatically protect a plug interface of a sub-parent body, and meanwhile, a user can still directly use the power of subsystem power supply inversion to operate a Load from a second AC output end of the subsystem;
secondly, the whole system or the separated parent system can be high-capacity, 4kW/2KW high power is output to store energy for families, when the whole system is combined, a subsystem bidirectional inverter and the parent system bidirectional inverter are in parallel operation to output, and power superposition is 4000W, and the power is output from a second AC output end of the subsystem to Load or a first AC output end of the parent system to Back-up; after the subsystem is disconnected with the mother system, the mother system can still output 2000W power through Back-up;
and thirdly, the whole machine is used as a household energy storage device, a household storage mode with photovoltaic priority is supported, and a user can input photovoltaic input from a solar power controller (MPPT) of the subsystem and the mother system shown in the figure 2 to supply household clean energy. If the photovoltaic output energy cannot meet the load consumption, the insufficient electric quantity can be supplied by the energy storage unit or the power grid.
In the description herein, reference to the terms "an implementation," "an embodiment," "a specific implementation," "an example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An energy storage device, comprising: a parent system and a subsystem; wherein the content of the first and second substances,
the subsystem and the mother system are in disconnectable connection;
the subsystem and the parent system are both used for:
receiving and storing first electric energy converted from solar energy;
when the power grid is connected, receiving second electric energy transmitted by the power grid;
outputting a supply power based on the stored electrical energy;
wherein:
when the subsystem is connected with the mother system, the power supply output by the subsystem and the mother system can be parallel and then is transmitted to a load connection node and/or a standby power connection node;
when the connection between the sub-system and the mother system is disconnected, the sub-system can separately transmit power to the load connection node, and the power of the mother system can separately transmit power to the standby power connection node.
2. The energy storage device of claim 1, wherein the parent system comprises: the photovoltaic energy storage system comprises a first photovoltaic panel, a first control unit, a first charge and discharge unit and a first energy storage unit; wherein the content of the first and second substances,
the first charge and discharge unit includes: the solar energy power generation system comprises a first DC input end, at least one first communication interface, a first DC interface, a first bidirectional inverter and a first solar energy controller;
the first AC input end of the first side of the first bidirectional inverter is used for connecting the power grid; the first AC output end of the first side of the first bidirectional inverter is used for connecting the standby power connection node; the first bi-directional inverter second side is directly or indirectly connected to the first DC interface; the controlled end of the first bidirectional inverter is also connected with the first control unit through the first communication interface so as to be controlled by the first control unit;
the first solar controller is connected between the first DC input and the first DC interface; the controlled end of the first solar controller is also connected to the first control unit through the first communication interface;
the first photovoltaic panel is connected with a first DC input end of the first charging and discharging unit;
the first control unit is respectively connected with the first energy storage unit and the first communication interface of the first charging and discharging unit;
the first energy storage unit is directly or indirectly connected with the first DC interface of the first charging and discharging unit.
3. The energy storage device of claim 2, wherein the parent system comprises: a first circuit breaker and/or a second circuit breaker; wherein the content of the first and second substances,
the first circuit breaker is connected between the first AC output end and the standby power connection end;
the second circuit breaker is connected between the first energy storage unit and the first DC interface of the first charging and discharging unit.
4. The energy storage device of claim 2, wherein the subsystem comprises: the photovoltaic energy storage system comprises a second photovoltaic panel, a second control unit, a second charge and discharge unit and a second energy storage unit; wherein the content of the first and second substances,
the second charge and discharge unit includes: the second DC input end, at least one second communication interface, a second DC interface, a second bidirectional inverter and a second solar controller;
the second AC input end of the first side of the second bidirectional inverter is used for connecting a power grid; a second AC output of a first side of the second bidirectional inverter for connection to the load connection node; the second bi-directional inverter second side is directly or indirectly connected to the second DC interface; the controlled end of the second bidirectional inverter is also connected with the second control unit through the second communication interface so as to be controlled by the second control unit;
the second solar controller is connected between the second DC input and the second DC interface; the controlled end of the second solar controller is also connected to the second control unit through the second communication interface;
the second photovoltaic panel is connected with a second DC input end of the second charging and discharging unit;
the second control unit is respectively connected with the second energy storage unit and a second communication interface of the second charging and discharging unit; the second control unit is also connected with the first control unit;
the second energy storage unit is directly or indirectly connected with a second DC interface of the second charging and discharging unit;
the first DC interface of the first charging and discharging unit is in disconnectable connection with the second DC interface of the second charging and discharging unit;
the first AC output end of the first charging and discharging unit is in disconnectable connection with the second AC output end of the second charging and discharging unit.
5. The energy storage device of claim 2 or 4, wherein the operation mode of the first bidirectional inverter is switchable under the control of the first control unit, and the operation mode of the second bidirectional inverter is switchable under the control of the second control unit, wherein the operation modes at least include:
the bidirectional inverter in the first mode can invert the electric energy of the energy storage unit connected to the second side and then output the electric energy to the AC output end of the first side;
the bidirectional inverter in the second mode can convert the electric energy received by the AC input end of the first side and then charge the energy storage unit connected with the second side;
and in the third mode, the bidirectional inverter in the third mode can supply the electric energy received by the AC input end of the second side to the AC output end of the second side and convert the redundant electric energy to charge the energy storage unit connected with the first side.
6. The energy storage device of claim 2 or 4, wherein the parent system further comprises: a first direct current bus control contactor;
the first direct current bus control contactor is connected between the first energy storage unit and a first DC interface of the first charging and discharging unit;
the subsystem further comprises: the second direct current bus controls the contactor;
and the second direct current bus control contactor is connected between the second energy storage unit and a second DC interface of the second charging and discharging unit.
7. The energy storage device of claim 4, wherein the subsystem is disconnectable from the parent system by at least one contactor.
8. The energy storage device of claim 7, wherein the at least one contactor comprises: the direct current parallel machine control contactor and the alternating current load parallel machine control contactor are arranged on the base; wherein the content of the first and second substances,
the direct current parallel operation control contactor comprises: the first direct current parallel machine control contactor and the second direct current parallel machine control contactor;
the parallel operation control contactor for the alternating current load comprises: the first alternating current load parallel operation control contactor and the second alternating current load parallel operation control contactor are connected in parallel;
the first end of the first direct current parallel operation control contactor is connected with the first DC interface of the first charging and discharging unit, the first end of the second direct current parallel operation control contactor is connected with the second DC interface of the second charging and discharging unit, and the second end of the first direct current parallel operation control contactor is in disconnectable connection with the second end of the second direct current parallel operation control contactor;
the first end of the first alternating current load parallel operation control contactor is connected with the first AC output end of the first charging and discharging unit, the first end of the second alternating current load parallel operation control contactor is connected with the second AC output end of the second charging and discharging unit, and the second end of the first alternating current load parallel operation control contactor is in disconnectable connection with the second end of the second alternating current load parallel operation control contactor.
9. The energy storage device of claim 1, wherein the parent system and/or the subsystem is further configured to:
and when the power grid is connected, storing at least part of the second electric energy transmitted by the power grid.
10. The energy storage device of claim 9, wherein the parent system and/or the subsystem is further configured to:
when the power grid is connected, outputting power supply based on the stored electric energy in a preset power grid wave crest period;
and when the power grid is connected, at least part of the second electric energy transmitted by the power grid is received and stored in a preset power grid trough period.
CN202110834220.4A 2021-07-21 2021-07-21 Energy storage device Pending CN113572267A (en)

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