CN103326423B - Network communication and control system for non-equilibrium management photovoltaic lithium-ion energy storage module nodes - Google Patents
Network communication and control system for non-equilibrium management photovoltaic lithium-ion energy storage module nodes Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 483
- 238000004146 energy storage Methods 0.000 title claims abstract description 165
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 48
- 239000010410 layer Substances 0.000 claims abstract description 266
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 230000010365 information processing Effects 0.000 claims abstract description 5
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 158
- 229910052744 lithium Inorganic materials 0.000 claims description 158
- 230000006855 networking Effects 0.000 claims description 42
- 230000008878 coupling Effects 0.000 claims description 26
- 238000010168 coupling process Methods 0.000 claims description 26
- 238000005859 coupling reaction Methods 0.000 claims description 26
- 238000002955 isolation Methods 0.000 claims description 26
- 230000003287 optical effect Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 3
- 230000005611 electricity Effects 0.000 description 15
- 210000004027 cell Anatomy 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 238000010248 power generation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
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- 230000008520 organization Effects 0.000 description 1
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- 210000000352 storage cell Anatomy 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a network communication and control system for non-equilibrium management photovoltaic lithium-ion energy storage module nodes. The system comprises a module communication and control layer, a relay communication layer and a central communication and control layer from bottom to top, wherein the module communication and control layer further comprises one or a plurality of parallel photovoltaic lithium-ion energy storage module nodes, wherein the nodes are based on CAN communication, and external transmission interfaces are in mutual series connection with one another. The module communication and control layer is used for achieving energy management and external transmission of the photovoltaic lithium-ion energy storage module and external communication of the module. The relay communication layer further comprises one or a plurality of relay communication nodes which are connected in a tree shape and based on CAN communication, and the relay communication layer is used for node expansion and interlayer information processing and forwarding of the network communication and control system. The central communication and control layer further comprises a CAN/ Ethernet protocol conversion unit and a central monitoring unit comprising an Ethernet interface, and the central communication and control layer is used for achieving the transmission function of data uplink and control order downlink between the nodes of the relay communication layer and the module communication and control layer.
Description
Technical Field
The invention relates to a non-equilibrium management photovoltaic lithium battery energy storage module node networking communication and control system.
Background
Solar energy has attracted increasing attention as a new energy source, and photovoltaic power generation, one of the main applications of the solar energy, has a wide market prospect. However, the main disadvantage of solar energy is that the energy is unstable, which is not available at night in the daytime and strong and weak in sunny days, and an energy storage battery is usually required to suppress the influence of solar energy instability. Therefore, photovoltaic energy storage power generation systems have come to be produced, which include photovoltaic cells for converting solar energy into electrical energy and energy storage cells for storing the electrical energy generated by the photovoltaic cells.
In the case of energy storage batteries, lithium batteries have a very large potential for use in the field of photovoltaic energy storage and power generation due to their high energy density and long cycle life. At present, special lithium battery packs for solar energy systems are sold in the market, and domestic telecommunication operators also actively investigate the application prospect of the lithium batteries in the communication field. In addition, the application research of the lithium battery in various aspects such as energy storage power sources, electric vehicles and the like is also actively carried out. It is expected that with the gradual maturity of lithium battery technology, the lithium battery will gradually become the main force of energy storage of the photovoltaic power generation system.
In order to improve the service life of a lithium ion battery pack and the safety of a photovoltaic lithium battery energy storage power generation system, a photovoltaic lithium battery energy storage system based on lithium ion battery unbalanced management has been proposed, which has a structure and a function that the system comprises a plurality of photovoltaic power storage modules connected in series, each photovoltaic power storage module comprises a lithium ion battery unit and a photovoltaic battery unit for charging the lithium ion battery unit, and further comprises an energy management unit for performing power control on the photovoltaic battery unit and the lithium ion battery unit, so as to realize the charging of the lithium ion battery unit by the photovoltaic battery unit, the discharging of the lithium ion battery unit and the external power supply of the module, reduce the influence of the capacity difference of the lithium ion battery unit on the system through the independent control of the module, and realize the unbalanced management of the series lithium ion battery pack, the cycle service life of the lithium ion battery pack is prolonged, and the safety of the system is improved.
According to the characteristics of an unbalanced management mode, a plurality of independent unbalanced management photovoltaic/lithium battery energy storage modules in the unbalanced management photovoltaic lithium battery system are provided with independent energy management units, while the power control of the photovoltaic battery units and the lithium ion battery units is realized, the characteristic information of the modules needs to be sent to a central monitoring system in a reliable and ordered organization form, a downlink command from the central monitoring system is received, the self-adaptive identification and configuration of the module nodes are realized, and the like, so that a large-scale node communication and control network is formed, wherein the intelligent construction of the network and the reliable communication of the network are key problems to be solved in the networking communication and control of the large-scale nodes, so that the intelligent networking, the node positioning and identification and the real-time and reliable communication of the node information of the system are realized, the requirements on the intelligence, the real-time performance and the reliability of the system are met. In addition, the comprehensive charge state of the whole photovoltaic lithium battery system under unbalanced management and the expected power supply capacity of the system are fully calculated and predicted in a layered and interconnected network distributed mode, and the intelligent and reliable supplement of the energy storage and power generation system is also effectively provided. The unbalanced management photovoltaic lithium battery energy storage system only explains the implementation mode of cascade and expansion of the power level of the unbalanced management photovoltaic lithium battery energy storage module, and effective design is not carried out on the construction and implementation of the large-scale node networking communication and control system.
Disclosure of Invention
In view of the above, there is a need to provide an effective module node networking communication and control system based on the unbalanced management photovoltaic lithium battery energy storage system, while the photovoltaic battery cells and the lithium ion battery cells of the power level of the photovoltaic lithium-ion electric energy storage module are subjected to effective energy management, by applying a system communication mechanism with high reliability and reasonable communication and control system topology, an ordered system communication and control network is intelligently constructed, the real-time interaction of system information and the reliable management of system nodes are achieved, the prediction and evaluation of the power supply capacity of the whole system are achieved through the information interaction among the communication layers, the instantaneity, the safety and the reliability of the photovoltaic lithium battery energy storage module and even the energy storage power generation system are improved finally, and the intelligent photovoltaic lithium battery energy storage system with the unbalanced management is constructed.
A photovoltaic lithium battery energy storage module node networking communication and control system with unbalanced management comprises a module communication and control layer, a relay communication layer and a central communication and control layer from bottom to top; the module communication and control layer further comprises one or more parallel CAN communication-based photovoltaic lithium battery energy storage module nodes with power transmission interfaces connected in series, and the photovoltaic lithium battery energy storage module nodes are used for realizing energy management, external power transmission and external communication of the module; the relay communication layer further comprises one or more relay communication nodes which are connected in a tree form and based on CAN communication, and the relay communication nodes are used for node expansion and interlayer information processing and forwarding of the networking communication and control system; the central communication and control layer further comprises a CAN/Ethernet protocol conversion unit and a central monitoring unit containing an Ethernet interface, and is used for realizing the functions of data uplink and control command downlink between nodes of the relay communication layer and the module communication and control layer.
Compared with the prior art, the networking communication and control system of the photovoltaic lithium-ion battery energy storage module with unbalanced management CAN effectively realize the intelligent construction of ordered system communication and control network by the aid of a hierarchical CAN bus network structure which is connected by the Ethernet and electrically isolated from top to bottom and is assisted by a reliable CAN bus and Ethernet communication protocol on the basis of power level application of the photovoltaic lithium-ion battery energy storage system with unbalanced management, and CAN simultaneously ensure the robustness of the communication and control system from software and hardware and realize real-time and reliable communication of system information in the network; meanwhile, the ordered communication and control network can realize reliable node positioning, can realize effective identification of independent nodes, particularly quick positioning of fault nodes, can intelligently identify fault types and take corresponding measures by combining uplink node information, combines the advantages of the existing photovoltaic lithium battery energy storage system under unbalanced management in lithium ion battery management, utilizes information interaction among nodes of each layer to predict and evaluate the power supply capacity of the photovoltaic lithium battery energy storage system under unbalanced management, and further improves the reliability and the intelligent level of the whole system.
Drawings
Fig. 1 is a schematic cascade diagram of a node networking communication and control system of an unbalanced management photovoltaic lithium battery energy storage module according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating an expanded connection of a node networking communication and control system of an unbalanced management photovoltaic lithium battery energy storage module according to an embodiment of the present invention.
Fig. 3 is a front view of an unbalanced management photovoltaic lithium battery energy storage unit based on the module node networking communication and control system according to the embodiment of the present invention.
Fig. 4 is a rear view of an unbalanced management photovoltaic lithium battery energy storage unit based on the module node networking communication and control system according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of an unbalanced management photovoltaic lithium battery energy storage system based on the module node networking communication and control system according to the embodiment of the present invention.
Fig. 6 is a schematic diagram of an unbalanced management photovoltaic lithium battery power supply system based on the module node networking communication and control system according to the embodiment of the present invention.
Description of the main elements
Photovoltaic lithium battery energy storage module node 10 with unbalanced management
Photovoltaic cell unit 12
Lithium ion battery cell 14
Module communication module and control layer node communication and control unit 16
Module communication module communication and control layer node energy management unit 17
Module communication and control layer node command receiving/data transmitting CAN transceiving unit 18
Module communication and control layer node optical coupling isolation receiving unit 19
First output terminal 101 of module node
Second output terminal 102 of module node
Module communication and control layer node command receiving/data transmitting CAN bus interface CANH terminal 103
CAN bus interface CANL end 104 for module communication and control layer node command receiving/data transmitting
Module communication and control layer node optical coupling isolation receiving unit signal input end 105
Module communication and control layer node optical coupling isolation receiving unit signal common ground terminal 106
Relay communication layer bottom layer relay communication node 20
Relay communication layer bottom layer relay communication node communication and control unit 22
Relay communication layer lower layer relay communication node command reception/data transmission CAN transceiving unit 23
Optical coupling isolation receiving unit 24 of relay communication node at bottom layer of relay communication layer
Relay communication layer lower layer relay communication node command transmission/data reception CAN transceiving unit 25
Relay communication layer bottom layer relay communication node demultiplexing unit 26
Irradiance detection circuit 27 for relay communication node at bottom layer of relay communication layer
CAN bus interface CANH end 201 for relay communication layer bottom layer relay communication node command receiving/data transmitting
Relay communication layer bottom layer relay communication node command receiving/data transmitting CAN bus interface CANL end 202
Signal input end 203 of optical coupling isolation receiving unit of relay communication node at bottom layer of relay communication layer
Signal common ground terminal 204 of optical coupling isolation receiving unit of relay communication node at bottom layer of relay communication layer
Relay communication layer bottom layer relay communication node command transmitting/data receiving CAN bus interface CANH terminal 205
Relay communication layer bottom layer relay communication node command transmission/data reception CAN bus interface CANL terminal 206
First channel 207 of relay communication node multi-path distribution unit at bottom layer of relay communication layer
Relay communication layer bottom layer relay communication node multi-path distribution unit end channel 208
Signal common ground terminal 209 of relay communication layer bottom layer relay communication node multi-path distribution unit
Relay communication layer top layer relay communication node 30
Relay communication layer top layer relay communication node communication and control unit 32
Relay communication layer top layer relay communication node command receiving/data transmitting CAN transceiving unit 34
Relay communication layer top layer relay communication node command transmitting/data receiving CAN transceiving unit 36
Relay communication layer top layer relay communication node multi-path distribution unit 38
Top relay communication node command receiving/data transmitting CAN bus interface CANH terminal 301 of relay communication layer
CAN bus interface CANL end 302 for command receiving/data transmitting CAN bus node of top layer of relay communication layer
Top relay communication node command transmitting/data receiving CAN bus interface CANH terminal 303 of relay communication layer
CAN bus interface CANL end 304 for command transmission/data reception of relay communication node at top layer of relay communication layer
First channel 305 of multi-path distribution unit of relay communication node at top layer of relay communication layer
Top-layer relay communication node multi-path distribution unit tail channel 306 of relay communication layer
Signal common ground terminal 307 of relay communication node multi-path distribution unit at top layer of relay communication layer
CAN/Ethernet protocol conversion unit 40
CAN/Ethernet protocol conversion module 42
CAN/Ethernet protocol conversion unit command receiving/data transmitting Ethernet communication interface 401
CAN/Ethernet protocol conversion unit command transmitting/data receiving CAN bus communication interface CANH terminal 402
CAN/Ethernet protocol conversion unit command sending/data receiving CAN bus communication interface CANL end 403
Central monitoring unit 50
The central monitoring module 52 to which the central monitoring unit belongs
Ethernet communication module 54 to which the central monitoring unit belongs
Command transmitting/data receiving Ethernet communication interface 501 of central monitoring unit
Photovoltaic lithium battery energy storage unit 60 with unbalanced management
First output end 62 of photovoltaic lithium battery energy storage unit for unbalanced management
Second output end 64 of photovoltaic lithium battery energy storage unit for unbalanced management
Photovoltaic lithium battery energy storage unit frame 66 with unbalanced management
Converter 70
Converter positive input 72
Negative converter input 74
Converter first output 76
Second output 78 of the converter
Photovoltaic lithium battery energy storage system frame 80 with unbalanced management
Non-equilibrium management photovoltaic lithium battery power supply system bus interface and protocol conversion unit frame body 90
Photovoltaic lithium battery power supply system bus interface and protocol conversion unit Ethernet interface 92 with unbalanced management
CANH (controller area network) end 94 for bus interface and protocol conversion unit CAN bus interface of photovoltaic lithium battery power supply system under unbalanced management
Unbalanced management photovoltaic lithium battery power supply system bus interface and protocol conversion unit CAN bus interface CANL end 96
Photovoltaic lithium battery energy storage system 100 with unbalanced management
Photovoltaic lithium battery power supply system 200 with unbalanced management
Detailed Description
The following describes an unbalanced photovoltaic lithium battery energy storage module node communication and control system, a photovoltaic lithium battery energy storage unit using the communication and control system, a photovoltaic lithium battery energy storage system using the communication and control system, and a power supply system in detail with reference to the accompanying drawings.
Referring to fig. 1, a first embodiment of the present invention provides a system for managing photovoltaic lithium battery energy storage module node networking communication and control in an unbalanced manner, wherein a cascade structure of the system includes a module communication and control layer, a relay communication layer, and a central communication and control layer from bottom to top; the module communication and control layer further comprises one or more parallel photovoltaic lithium battery energy storage module nodes 10 which are based on CAN communication and CAN be connected with external power transmission interfaces in series, and the photovoltaic lithium battery energy storage module nodes are used for realizing energy management, external power transmission and external communication of the module nodes 10; the relay communication layer further comprises one or more relay communication nodes 20 and a top layer relay communication node 30 which are connected in a tree form and based on CAN communication, and the relay communication nodes are used for expanding and processing and forwarding interlayer information of the unbalanced photovoltaic lithium battery energy storage module nodes 10 of the networking communication and control system; the central communication and control layer further comprises a CAN/ethernet protocol conversion unit 40 and a central monitoring unit 50 with an ethernet interface, and is used for realizing the functions of data uplink and control command downlink transmission between the photovoltaic lithium battery energy storage module nodes 10 of the unbalanced management of the module communication and control layer through the relay communication nodes 20 and 30.
The photovoltaic lithium-ion battery energy storage module node 10 for unbalanced management comprises a photovoltaic battery unit 12, a lithium ion battery unit 14, a communication and control unit 16, a power control circuit unit 17, a command receiving/data sending CAN transceiving unit 18, an optical coupling isolation receiving unit 19, a pair of external power transmission first output ends 101, a pair of external power transmission second output ends 102, a command receiving/data sending CAN bus communication interface CANH end 103, a command receiving/data sending CAN bus communication interface CANL end 104, an optical coupling isolation receiving unit signal input end 105 and an optical coupling isolation receiving unit signal common ground end 106. The photovoltaic cell unit 12 and the lithium ion battery unit 14 are both electrically connected to the power control circuit unit 17, and supply power to an external load through the first output terminal 101 for external power transmission and the second output terminal 102 for external power transmission. The communication and control unit 16 is used for analyzing the downlink command and the configuration message of the relay communication layer bottom layer relay communication node 20, controlling the working state of the power control circuit unit 17 of the photovoltaic lithium battery energy storage module node 10 under unbalanced management according to the downlink command message, and performing communication configuration of the photovoltaic lithium battery energy storage module node 10 under unbalanced management according to the downlink configuration message, and acquiring and constructing the characteristic information of the photovoltaic lithium battery energy storage module node 10 under unbalanced management according to the downlink configuration message. The power control circuit 17 is configured to control the charging of the lithium ion battery unit 14 by the photovoltaic battery unit 12, the external output of the photovoltaic battery unit 12 and the lithium ion battery unit 14, and perform floating charge management on the lithium ion battery unit 14. The optical coupling isolation receiving unit 19 is electrically connected with the multi-path distribution unit 26 of the relay communication layer bottom layer relay communication node 20 through an optical coupling isolation receiving unit signal input end 105 and an optical coupling isolation receiving unit signal common ground end 106, and is used for triggering the communication configuration function of the photovoltaic lithium battery energy storage module node 10 of the unbalanced management. The first output terminal 101 and the second output terminal 102 can be connected to an external electric device to output electricity.
The relay communication node 20 at the bottom layer of the relay communication layer comprises a communication and control unit 22, a command receiving/data sending CAN transceiving unit 23, an optical coupling isolation receiving unit 24, a command sending/data receiving CAN transceiving unit 25, a multi-path distribution unit 26, an irradiance detection circuit 27, a command receiving/data sending CAN bus communication interface CANH end 201, a command receiving/data sending CAN bus communication interface CANL end 202, an optical coupling isolation receiving unit signal input end 203, an optical coupling isolation receiving unit signal common end 204, a command sending/data receiving CAN bus communication interface CANH end 205, a command sending/data receiving CAN bus communication interface CANL end 206, a multi-path distribution unit signal output end, and a multi-path distribution unit signal common end 209. The signal output end of the multi-path distribution unit comprises a multi-path distribution channel from a first channel 207 of the multi-path distribution unit to a last channel 208 of the multi-path distribution unit. Considering the requirement of practical application, the irradiance detection circuit 27 is configured to detect irradiance information of a plurality of non-equilibrium management photovoltaic lithium electrical energy storage module nodes 10 cascaded by the relay communication layer bottom layer relay communication node, so as to represent an average irradiance of the plurality of cascaded non-equilibrium management photovoltaic lithium electrical energy storage module nodes 10. The communication and control unit 22 is configured to parse the downlink command and configuration message of the relay communication node 30 at the top layer of the relay communication layer, and is used for communication configuration of the relay communication layer bottom layer relay communication node 20, and sending the analysis result to the corresponding non-equilibrium management photovoltaic lithium battery energy storage module node 10 through the command sending/data receiving CAN transceiving unit 25, and transmits a downlink command control message through the command transmitting/data receiving CAN transceiving unit 25 according to the detection result of the irradiance detection circuit 27, and the command receiving/data sending CAN receiving and sending unit 23 is used for collecting and processing the characteristic information data messages of the photovoltaic lithium battery energy storage module node 10 with unbalanced management from the command sending/data receiving CAN receiving and sending unit 25 and forming the processing results into messages for uplink sending. The command receiving/data sending CAN transceiver unit 18 of the photovoltaic lithium-ion battery energy storage module node 10 for unbalanced management of the module communication and control layer is respectively connected with the command sending/data receiving CAN bus communication interface CANH end 205 and the command sending/data receiving CAN bus communication interface CANL end 206 of the relay communication layer bottom layer relay communication node 20 through the command receiving/data sending CAN bus communication interface CANH end 103 and the command receiving/data sending CAN bus communication interface CANL end 104, electrically connected to the command transmitting/data receiving CAN transceiver unit 25 of the relay communication layer lower layer relay communication node 20 to constitute a CAN communication sub-network, and the characteristic information data message is used for receiving the downlink command and the configuration message and sending the characteristic information data message of the photovoltaic lithium battery energy storage module node 10 in an uplink manner by the photovoltaic lithium battery energy storage module node 10 in the unbalanced management. The optical coupling isolation receiving unit 24 is electrically connected with the multi-path distribution unit 38 of the relay communication node 30 on the top layer of the relay communication layer through an optical coupling isolation receiving unit signal input end 203 and an optical coupling isolation receiving unit signal common ground end 204, and is used for triggering a communication configuration function of the relay communication node 20 on the bottom layer of the relay communication layer.
The relay communication layer top layer relay communication node 30 includes a communication and control unit 32, a command receiving/data sending CAN transceiving unit 34, a command sending/data receiving CAN transceiving unit 36, a multi-path distribution unit 38, a command receiving/data sending CAN bus communication interface CANH end 301, a command receiving/data sending CAN bus communication interface CANL end 302, a command sending/data receiving CAN bus communication interface CANH end 303, a command sending/data receiving CAN bus communication interface CANL end 304, a multi-path distribution unit signal output end, and a multi-path distribution unit signal common end 307. The signal output of the demultiplexing unit comprises the demultiplexed channels from the first channel 305 of the demultiplexing unit to the last channel 306 of the demultiplexing unit. Compared with the relay communication layer bottom layer relay communication node 20, the relay communication layer top layer relay communication node 30 does not have an irradiance detection circuit 27, the relay communication layer top layer relay communication node 30 serves as a root node of a relay communication layer, each unbalanced photovoltaic lithium-ion battery energy storage module node communication and control system has one and only one unbalanced photovoltaic lithium-ion battery energy storage module node communication and control node 30, and meanwhile, the unbalanced photovoltaic lithium-ion battery energy storage module node communication and control system CAN communication tree-structure network also serves as a root node. The communication and control unit 32 is configured to analyze downlink commands and configuration messages sent by the central communication and control layer, send analysis results to the corresponding relay communication layer bottom layer relay communication nodes 20 through the command sending/data receiving CAN transceiver unit 36, and aggregate data messages from the relay communication layer bottom layer relay communication nodes 20 of the command sending/data receiving CAN transceiver unit 36 through the command receiving/data sending CAN transceiver unit 34, and form processing results into message uplink for sending. The command receiving/data transmitting CAN transceiver unit 23 of the relay communication layer bottom layer relay communication node 20 is connected to the command transmitting/data receiving CAN bus communication interface CANH end 303 and the command transmitting/data receiving CAN bus communication interface CANL end 304 of the relay communication layer top layer relay communication node 30 through the command receiving/data transmitting CAN bus communication interface CANH end 201 and the command receiving/data transmitting CAN bus communication interface CANL end 202, electrically connected to the command transmitting/data receiving CAN transceiver unit 36 of the relay communication layer top layer relay communication node 30, constituting a CAN communication sub-network, the method is used for the relay communication layer bottom layer relay communication node 20 to receive the downlink command and the configuration message and to send the summarized data message of the relay communication layer bottom layer relay communication node 20 in an uplink manner.
The CAN/ethernet protocol conversion unit 40 includes a CAN/ethernet protocol conversion module 42, a command receiving/data transmitting ethernet communication interface 401, a command transmitting/data receiving CAN bus communication interface CANH end 402, and a command transmitting/data receiving CAN bus communication interface CANL end 403. The command receiving/data sending CAN transceiver unit 34 of the relay communication layer top relay communication node 30 is respectively connected with the command sending/data receiving CAN bus communication interface CANH terminal 402 and the command sending/data receiving CAN bus communication interface CANL terminal 403 of the CAN/ethernet protocol conversion unit through the command receiving/data sending CAN bus communication interface CANH terminal 301 and the command receiving/data sending CAN bus communication interface CANL terminal 302, so as to be electrically connected with the CAN bus interface of the CAN/ethernet protocol conversion unit 40, so as to form a CAN communication sub-network, which is a top CAN sub-network of the unbalanced management photovoltaic lithium battery energy storage module node communication and control system, and is used for expanding and cascading the CAN communication sub-network in the form of a tree network through the relay communication layer top relay communication node 30, and constructing a CAN communication network of the photovoltaic lithium battery energy storage system under the unbalanced management. The ethernet protocol conversion module 42 is used for performing bidirectional protocol conversion between the CAN bus and the ethernet information and completing bidirectional message transceiving tasks.
According to the electrical characteristics of the CAN bus transceiver, it is impossible to attach a theoretically infinite CAN communication node in a single CAN communication network, so the number of the CAN communication nodes attached to each CAN communication sub-network proposed by the embodiment of the present invention is 65, and a top-level CAN communication node is included as an external communication interface of the CAN communication sub-network. Therefore, the relay communication layer may include more than two relay communication node hierarchies according to the requirements of different scale power class or voltage class applications, and thus one or more upper relay communication layers are required to be inserted between the relay communication layer top layer relay communication node 30 and the relay communication layer bottom layer relay communication node 20 to bridge the relay communication layer top layer relay communication node 30 and the relay communication layer bottom layer relay communication node 20 and expand the power class or voltage class of the photovoltaic lithium battery energy storage system. The relay communication node on the upper layer of the relay communication layer is provided with an optical coupling isolation receiving unit compared with the relay communication node 30 on the top layer of the relay communication layer; the irradiance detection circuit 27 is absent from the relay communication layer underlying relay communication node 20. In this embodiment, only a relay communication layer with a two-layer structure is taken as an implementation mode to structurally explain the networking communication and control system of the photovoltaic lithium battery energy storage module with unbalanced management.
The central monitoring unit 50 of the central communication and control layer includes a central monitoring module 52, an ethernet communication module 54 and a command transmitting/data receiving ethernet communication interface 501. The command receiving/data transmitting ethernet communication interface 401 of the CAN/ethernet protocol conversion unit 40 is electrically connected to the ethernet communication module 54 of the central monitoring unit 50 through the command transmitting/data receiving ethernet communication interface 501 of the central monitoring unit 50. The command transmitting/data receiving ethernet communication interface 501 is configured to receive an uplink summary processing data packet and a system downlink command packet from the CAN/ethernet protocol conversion unit 40.
For the networking communication and control system of the photovoltaic lithium battery energy storage module nodes under unbalanced management, when the system is initialized, except that the relay communication nodes 30 on the top layer of the relay communication layer are preconfigured to be in a transceiving state in the CAN network topology, the relay communication nodes 20 on the bottom layer of the relay communication layer and the CAN communication units of the photovoltaic lithium battery energy storage module nodes 10 under unbalanced management of the module communication and control layer are all in a non-transceiving state, and the triggering of the node configuration process is waited. An initialization command ethernet communication message is sent by the central monitoring unit 50 through the ethernet communication module 54 via the command sending/data receiving ethernet communication interface 501, the message is received and converted into a CAN format communication message by the CAN/ethernet protocol conversion module 42 of the CAN/ethernet protocol conversion unit 40 via the command receiving/data sending ethernet communication interface 401, and is sent by the command sending/data receiving CAN bus communication interface CANH terminal 402, a command sending/data receiving CAN bus communication interface CANL terminal 403, and is received by the command receiving/data sending CAN transceiving unit 34 of the relay communication layer top layer relay communication node 30 via the command receiving/data sending CAN bus communication interface CANH terminal 301 and the command receiving/data sending CAN bus communication interface CANL terminal 302, from there on the intelligent networking process of the CAN communication network is started. At this time, the communication and control unit 32 of the relay communication layer top layer relay communication node 30 triggers the optical coupling isolation receiving unit 24 of the relay communication layer bottom layer relay communication node 20 electrically connected with the optical coupling isolation receiving unit through the first channel 305 of the multi-path distribution unit 38 via the signal input end 203 of the optical coupling isolation receiving unit of the relay communication layer bottom layer relay communication node 20, further triggers the communication and control unit 22 of the relay communication layer bottom layer relay communication node 20 to enter a node communication configuration state, and makes the command receiving/data sending CAN receiving/sending unit 23 of the relay communication layer bottom layer relay communication node 20 enter a receivable state, sends a handshake data packet and then enters a command packet receiving state, and informs the relay communication layer top layer relay communication node 30 that the node configuration command packet CAN be sent, at this time, the communication and control unit 32 of the relay communication layer top layer relay communication node 30 sends the node configuration packet Through the command transmitting/data receiving CAN transceiver unit 36 via the command transmitting/data receiving CAN bus communication interface CANH terminal 303 and the command transmitting/data receiving CAN bus communication interface CANL terminal 304, the command receiving/data transmitting CAN transceiver unit 23 of the relay communication layer lower layer relay communication node 20 receives via the command receiving/data transmitting CAN bus communication interface CANH terminal 201 and the command receiving/data transmitting CAN bus communication interface CANL terminal 202, and performs node communication configuration of the relay communication layer lower layer relay communication node 20, including information such as a node number and a node frame ID, to construct an ordered CAN communication sub-network, and configures the command transmitting/data receiving CAN transceiver unit 25 of the relay communication layer lower layer relay communication node 20 to be in a transmitting and receiving state. Subsequently, the relay communication layer bottom layer relay communication node 20 initiates a node configuration process of the photovoltaic lithium battery energy storage module 10 for unbalanced management of the module communication and control layer, which is the same as the node communication configuration process of the relay communication layer top layer relay communication node 30 for the relay communication layer bottom layer relay communication node 20. Meanwhile, the relay communication layer top layer relay communication node 30 will continue to trigger and complete the node configuration process of the relay communication layer bottom layer relay communication node 20 electrically connected with the subsequent channels of the multi-channel distribution unit, and the relay communication layer bottom layer relay communication node 20 will also continue to initiate the node configuration process of the photovoltaic lithium battery energy storage module node 10 for unbalanced management of the module communication and control layer, and each level of relatively independent node configuration is ended when the triggering is finished after the overtime and no handshake signal message from the cascade communication node is received, and finally the ordered networking construction of the CAN communication network to which the whole unbalanced management photovoltaic lithium battery energy storage module node networking communication and control system belongs is completed, because the number of the CAN communication nodes of each CAN communication sub-network is 65 and the construction of the multi-layer CAN sub-network structure, the CAN communication network CAN realize the relatively multi-parallel configuration, therefore, the time consumption of the initialization process does not increase remarkably with the expansion of the node scale, and the normal operation of the system is not influenced.
After the ordered networking of the CAN communication network to which the unbalanced management photovoltaic lithium battery energy storage module node networking communication and control system belongs is constructed, the command sending/data receiving CAN transceiving units 36 and 25 of the relay communication node of the relay communication layer are in a data receiving state by default so as to perform a subsequent data message uplink transmission process initiated by the unbalanced management photovoltaic lithium battery energy storage module node 10 of the ordered communication and control layer; if the system control message needs to be sent downwards midway, the CAN transceiving units 36 and 25 CAN switch transceiving states at any time to complete the issuing process of the command message, and the switching is also suitable for the condition that the relay communication layer bottom layer relay communication node 20 needs to send downwards according to the monitoring information of the irradiance detection circuit 27 to control the working state of the power control circuit unit 17 of the photovoltaic lithium battery energy storage module node 10 for unbalanced management of the module communication and control layer. Therefore, the module communication and control layer, the relay communication layer and the central communication and control layer are matched from bottom to top, so that the real-time processing and the ordered transmission of the uplink data message and the downlink command message information in the networking communication and control system can be realized.
When the ordered networking construction of the CAN communication network to which the unbalanced management photovoltaic lithium battery energy storage module node networking communication and control system belongs is completed, the module communication and control layer node 10 predicts the module power supply capacity and estimates the module equivalent charge state through the parameter acquisition of each unbalanced management photovoltaic lithium battery energy storage module, and the module power supply capacity takes the comprehensive power output capacity of the photovoltaic battery unit and the lithium ion battery unit in the unbalanced management photovoltaic lithium battery energy storage module into account.
In practical application, the lithium ion battery unit 14 and the energy management unit 16 may be disposed on a surface of the photovoltaic battery unit 12, where the surface is opposite to a surface of the photovoltaic battery unit 12 irradiated by light, so as to form a complete node of the photovoltaic lithium battery energy storage module 10 for independent non-equilibrium management.
Referring to fig. 2 to 5, an embodiment of the present invention provides an unbalanced management photovoltaic lithium battery energy storage system 100 based on the module node networking communication and control system, where the unbalanced management photovoltaic lithium battery energy storage system 100 includes a plurality of unbalanced management photovoltaic lithium battery energy storage module nodes 10 that are connected in series, and an unbalanced management photovoltaic lithium battery energy storage unit 60 that is established on the basis of the plurality of unbalanced management photovoltaic lithium battery energy storage module nodes 10 that are connected in series and is composed of the relay communication layer bottom layer relay communication node 20 and the unbalanced management photovoltaic lithium battery energy storage module nodes 10 that belong to the same CAN communication subnet as the relay communication layer bottom layer relay communication node 20. Specifically, a first output end 101 of each unbalanced management photovoltaic lithium battery energy storage module node 10 is electrically connected to a second output end 102 of another unbalanced management photovoltaic lithium battery energy storage module node 10, and the second output end 102 is electrically connected to a first output end 101 of another unbalanced management photovoltaic lithium battery energy storage module node 10, so that a plurality of unbalanced management photovoltaic lithium battery energy storage module nodes 10 are connected in series, and an external CAN communication interface of the unbalanced management photovoltaic lithium battery energy storage unit 60 is a command receiving/data sending CAN communication interface 23 of the relay communication layer bottom layer relay communication node 20. This the output voltage of unbalance management photovoltaic lithium electricity energy storage unit 60 does the sum of the output voltages of a plurality of unbalance management photovoltaic lithium electricity energy storage module nodes 10, the output voltage of unbalance management photovoltaic lithium electricity energy storage system 100 does the sum of the output voltages of a plurality of unbalance management photovoltaic lithium electricity energy storage units 60. The plurality of photovoltaic lithium battery energy storage units 60 under unbalanced management and the relay communication layer top layer relay communication nodes 30, the CAN/Ethernet protocol conversion unit 40 and the central monitoring unit 50 connected in an uplink mode form a complete module node networking communication and control system of the photovoltaic lithium battery energy storage system 100 under unbalanced management. For each unbalanced management photovoltaic lithium battery energy storage unit 60, the number of the unbalanced management photovoltaic lithium battery energy storage module nodes 10 included in the unit is recommended to be 64.
In the practical application process, can with a plurality of that unbalanced management photovoltaic lithium electricity energy storage unit 60 contains unbalanced management photovoltaic lithium electricity energy storage module node 10 splices as a whole, and will relay communication layer bottom communication node 20 and this unbalanced management photovoltaic lithium electricity energy storage unit 60's first output 62 and second output 64 set up with a plurality of unbalanced management photovoltaic lithium electricity energy storage module node 10 in the framework 66 of the same surface of lithium ion battery unit 14, this surface with the surface that the photovoltaic cell unit 12 of unbalanced management photovoltaic lithium electricity energy storage module node 10 received the light irradiation is relative to form a complete unbalanced management photovoltaic lithium electricity energy storage unit 60.
Further, in order to enable the output voltage of the photovoltaic lithium battery energy storage system 100 with unbalanced management to meet the actual requirement, a plurality of photovoltaic lithium battery energy storage units 60 with unbalanced management in the photovoltaic lithium battery energy storage system 100 may be electrically connected to a converter 70, and the converter 70 may be a dc-dc converter or a dc-ac inverter. The converter 70 can convert the output voltage of the photovoltaic lithium-ion battery energy storage system 100 into a dc voltage or an ac voltage for practical application. Meanwhile, when the lithium ion battery cells 14 in the plurality of non-equilibrium management photovoltaic lithium ion electric energy storage modules 10 of the one or more non-equilibrium management photovoltaic lithium ion electric energy storage units 60 in the non-equilibrium management photovoltaic lithium ion electric energy storage system 100 are suspended from being output due to over-discharge, as long as the total output power of the remaining plurality of non-equilibrium management photovoltaic lithium ion electric energy storage modules 10 can meet the actual requirement, the converter 70 may adjust its own output power to compensate for the decrease in output power caused by the suspension of the output of the one or more non-equilibrium management photovoltaic lithium ion electric energy storage modules 10, and at the same time, the module switching information data packet may be effectively uploaded to the central monitoring unit 50 in real time through the module node networking communication system.
In addition, the plurality of the photovoltaic lithium battery energy storage units 60 and the converters 70 of the overall photovoltaic lithium battery energy storage system 100 with unbalanced management, and the relay communication layer top layer relay communication node 30 and the CAN/ethernet protocol conversion unit 40 may be further disposed in a frame 80, wherein the converter 70 includes a converter positive input terminal 72, a converter negative input terminal 74, a converter first output terminal 76 and a converter second output terminal 78; the relay communication layer top layer relay communication node 30 comprises a multi-channel selection unit 38, a command receiving/data sending CAN summarizing interface CANH end 301, a command receiving/data sending CAN summarizing interface CANH end 302, a command sending/data receiving CAN summarizing interface CANH end 303 and a command sending/data receiving CAN summarizing interface CANH end 304; the CAN/ethernet protocol conversion unit 40 includes a command receiving/data transmitting ethernet communication interface 401, a command transmitting/data receiving CAN bus communication interface CANH end 402, and a command transmitting/data receiving CAN bus communication interface CANL end 403. Specifically, for the converter 70, the positive input end 72 of the converter is electrically connected to the first output end 62 of one non-equilibrium management photovoltaic lithium-ion battery energy storage unit 60, the negative input end 74 of the converter is electrically connected to the second output end 64 of another non-equilibrium management photovoltaic lithium-ion battery energy storage unit 60, and the first output end 76 and the second output end 78 of the converter are used for being connected to external devices; for the relay communication layer top layer relay communication node 30, a command receiving/data sending CAN summary interface CANH end 301 and a command receiving/data sending CAN summary interface CANH end 302 of the relay communication layer top layer relay communication node are respectively electrically connected with a command receiving/data sending CAN bus communication interface CANH end 201 and a command receiving/data sending CAN bus communication interface CANL end 202 of the relay communication layer bottom layer relay communication node 20 of each unbalanced management photovoltaic lithium battery energy storage unit 60, and a multi-path distribution unit 38 of the relay communication layer top layer relay communication node 30 is respectively electrically connected with an optical coupling isolation receiving unit 27 of the relay communication layer bottom layer relay communication node 20; for the CAN/ethernet protocol conversion unit 40, the command sending/data receiving CAN bus communication interface CANH end 402 and the command sending/data receiving CAN bus communication interface CANL end 403 of the CAN/ethernet protocol conversion unit are respectively electrically connected with the command receiving/data sending CAN bus communication interface CANH end 301 and the command receiving/data sending CAN bus communication interface CANL end 302 of the relay communication layer top layer relay communication node 30, the command receiving/data sending ethernet communication interface 401 is electrically connected with the ethernet communication interface 501 of the central monitoring unit 50 which CAN be used as an independent operation device, and thus the network construction and communication of the module node networking communication and control system of the unbalanced management photovoltaic lithium battery energy storage system 100 are realized.
Referring to fig. 6, a photovoltaic lithium battery power supply system 200 for unbalanced management according to a second embodiment of the present invention includes a plurality of photovoltaic lithium battery energy storage systems 100 connected in parallel. Specifically, the first output ends 76 of the converters in the photovoltaic lithium battery energy storage systems 100 with multiple unbalanced management are electrically connected to each other, and the second output ends 78 of the converters in the photovoltaic lithium battery energy storage systems 100 with multiple unbalanced management are electrically connected to each other, so that the photovoltaic lithium battery energy storage systems 100 with multiple unbalanced management are connected in parallel. The photovoltaic lithium battery power supply system with unbalanced management 200 can simultaneously output voltage and power to a plurality of external output devices through the plurality of photovoltaic lithium battery energy storage systems 100 with unbalanced management connected in parallel. The plurality of photovoltaic lithium energy storage systems 100 with parallel connected non-equilibrium management of the photovoltaic lithium electricity power supply system 200 is different from the photovoltaic lithium energy storage system 100 with parallel connected non-equilibrium management in the first embodiment of the present invention in that, because the plurality of photovoltaic lithium energy storage systems 100 with parallel connected non-equilibrium management need to be incorporated into the CAN communication network of the same module node networking communication and control system, the relay communication layer top layer relay communication node 30 and the CAN/ethernet protocol conversion unit 40 are not included in the implementation of the plurality of photovoltaic lithium energy storage systems 100 with parallel connected non-equilibrium management, but the relay communication layer top layer relay communication node 30 and the CAN/ethernet protocol conversion unit 40 are disposed in the independent frame 90 of the bus interface and protocol conversion unit of the photovoltaic lithium electricity power supply system with non-equilibrium management, and the external communication and control interface is used as the external communication and control interface of the photovoltaic lithium battery power supply system 200 with unbalanced management to form the photovoltaic lithium battery power supply system with the scalable power level and unbalanced management.
According to the photovoltaic lithium battery power supply system 200 based on the unbalanced management of the module node networking communication and control system, on the basis of the prediction of the power supply capacity and the estimation of the equivalent charge state of each node 10 of the module communication and control layer, the central monitoring unit 50 comprehensively utilizes the effective information to predict and estimate the equivalent power supply capacity and the estimation of the equivalent charge state of the system of the photovoltaic lithium battery power supply system 200 through the information interaction and distributed calculation of the control and communication network.
The node communication and control system for the photovoltaic lithium battery energy storage module with the unbalanced management, the photovoltaic lithium battery energy storage unit with the unbalanced management, the photovoltaic lithium battery energy storage system with the unbalanced management and the photovoltaic lithium battery power supply system with the unbalanced management, which are constructed on the basis of the node communication and control system, has the following advantages: the photovoltaic lithium battery energy storage module node networking communication and control system for unbalanced management CAN effectively realize ordered system communication and intelligent construction of a control network and real-time and reliable communication of system information in the network through a top-down electrically isolated hierarchical CAN bus network structure connected by Ethernet on the basis of realizing energy management of photovoltaic battery units and lithium ion battery units, namely multi-module unbalanced management at a power level, and by assisting with a reliable CAN bus and Ethernet communication protocol; meanwhile, the ordered communication and control network can realize reliable node positioning, can realize effective identification of independent nodes, particularly quick positioning of fault nodes, can intelligently identify fault types and take corresponding measures by combining uplink node information, can effectively predict the power supply capacity and estimate the charge state of the whole system, and further improves the reliability and the intelligent level of the whole system by combining the advantages of the existing unbalanced management photovoltaic lithium battery energy storage system in lithium ion battery management; in addition, the unbalanced management photovoltaic lithium battery energy storage module node communication and control system provided by the invention is formed by connecting a plurality of CAN communication sub-networks through a CAN communication network constructed by a tree network structure, so that the time consumption is not obviously increased along with the expansion of the node scale in the system initialization process, and the calculation and information processing tasks of the system CAN be reasonably shared under the participation of a plurality of relay communication nodes of a relay communication layer, the information processing efficiency and the real-time performance of dynamic response of the system are improved, and the functions of the unbalanced management photovoltaic lithium battery energy storage module node communication and control system are more intelligently realized. The unbalanced management photovoltaic lithium battery energy storage unit, the unbalanced management photovoltaic lithium battery energy storage system and the unbalanced management photovoltaic lithium battery power supply system are constructed on the basis, the output voltage can be converted into the voltage required by practical application through the direct current-direct current converter or the direct current-alternating current converter, when one or more unbalanced management photovoltaic lithium battery energy storage modules are cut out due to over discharge of the lithium ion battery units, other unbalanced management photovoltaic lithium battery energy storage modules can still normally output, the output voltage of the whole unbalanced management photovoltaic lithium battery energy storage system and the power supply system can be adjusted to the voltage required actually through the direct current-direct current converter or the direct current-alternating current converter, state information is effectively fed back to the central monitoring system in real time through the module node networking communication and control system, and on the basis of fully utilizing each unbalanced management photovoltaic lithium battery energy storage module, the real-time performance and the reliability of the system are improved; under module node networking communication and control system's cooperation, through the number of selecting the photovoltaic lithium electricity energy storage module of unbalanced management, it is adjustable unbalanced management photovoltaic lithium electricity energy storage system's total voltage to satisfy the equipment that has different voltage input demands, improve the flexibility of system's power supply.
In addition, other modifications within the spirit of the invention may occur to those skilled in the art, and such modifications are intended to be included within the scope of the invention as claimed.
Claims (6)
1. A networking communication and control system for a photovoltaic lithium battery energy storage module node with unbalanced management is characterized in that the networking communication and control system for the photovoltaic lithium battery energy storage module node with unbalanced management comprises a module communication and control layer, a relay communication layer and a central communication and control layer from bottom to top; wherein,
the module communication and control layer further comprises one or more parallel CAN communication-based photovoltaic lithium battery energy storage module nodes with power transmission interfaces connected in series, and the photovoltaic lithium battery energy storage module nodes are used for realizing energy management, external power transmission and external communication of the module;
the relay communication layer further comprises one or more relay communication nodes which are connected in a tree form and based on CAN communication, and the relay communication nodes are used for node expansion and interlayer information processing and forwarding of the networking communication and control system;
the central communication and control layer further comprises a CAN/Ethernet protocol conversion unit and a central monitoring unit containing an Ethernet interface, and is used for realizing the functions of data message uplink and control command message downlink transmission between nodes of the relay communication layer and the module communication and control layer.
2. The system according to claim 1, wherein the unbalanced management photovoltaic lithium battery energy storage module nodes of the module communication and control layer collect node characteristic information and send uplink data messages while completing node configuration according to received downlink command messages, and the unbalanced management photovoltaic lithium battery energy storage module nodes of the module communication and control layer comprise:
a command receiving/data transmitting CAN receiving and transmitting unit for receiving system downlink command messages, downlink node configuration command messages of upper layer relay communication nodes and transmitting module node characteristic data messages;
the optical coupling isolation receiving unit is used for receiving the downlink node configuration trigger pulse;
the power control circuit unit is used for carrying out energy management on the photovoltaic battery unit and the lithium ion battery unit of the photovoltaic lithium battery energy storage module node under the unbalanced management;
and the communication and control unit is used for completing the working state control, the node configuration, the node information acquisition, the downlink command and configuration message analysis and the uplink data message preparation of the node power control circuit unit of the photovoltaic lithium battery energy storage module under the unbalanced management.
3. The system according to claim 1, wherein the relay communication node at the bottom of the relay communication layer is configured to collect uplink data messages of the photovoltaic lithium battery energy storage module node with unbalanced management at the cascaded module communication and control layer, perform data processing and uplink data message transmission, and forward downlink command messages and participate in networking communication configuration of the photovoltaic lithium battery energy storage module node with unbalanced management at the module communication and control layer, and the relay communication node at the bottom of the relay communication layer comprises:
the command receiving/data sending CAN receiving and sending unit is used for receiving a system downlink command message and sending a data message of the unbalanced management photovoltaic lithium battery energy storage module node uplink summary processing of the module communication and control layer;
a downlink CAN transceiving unit for receiving the uplink acquisition information message of the bottom module node and sending a system downlink command message and a downlink node configuration command message;
the optical coupling isolation receiving unit is used for receiving the node configuration trigger pulse;
a multi-path distribution unit for triggering the node configuration command;
the irradiance detection circuit is used for detecting the irradiance information of the node of the photovoltaic lithium battery energy storage module in the same communication and control sub-network to which the relay communication node at the bottom layer of the relay communication layer belongs;
and the communication and control unit is used for completing the analysis of the downlink command message and the preparation of the uplink command message and sending the control command message of the downlink power control circuit unit according to the irradiance detection signal.
4. The system for managing photovoltaic lithium battery energy storage module node networking communication and control in a non-uniform manner according to claim 1, wherein the top relay communication node of the relay communication layer is configured to collect uplink data information of the relay communication nodes cascaded by the top relay communication node, perform data processing and uplink data message transmission, and forward system downlink commands and downlink configuration commands, and the like, and the system comprises:
a command receiving/data transmitting CAN receiving and transmitting unit for receiving system downlink command messages and transmitting uplink summary processing data messages of the cascade relay communication nodes;
a command sending/data receiving CAN receiving and sending unit for receiving the uplink summarized data message of the cascade relay communication node and sending a system downlink command message and a downlink node configuration message;
a multi-path distribution unit for triggering the node configuration command;
and the communication and control unit is used for completing the analysis of the downlink command message and the preparation of the uplink command message.
5. The system according to claim 3, wherein the networking communication and control of the energy storage module nodes of the photovoltaic lithium-ion battery energy storage system for unbalanced management is realized through a tree network structure of the module communication and control layer, the relay communication layer and the central communication and control layer, and the system has the main functions that for an initialization process, a downlink initialization configuration command is sent by the central communication and control layer, and the relay communication layer and the module communication and control layer are matched with the multi-path distribution unit and the optical coupling isolation receiving units with the ports corresponding to the multi-path distribution unit and the ports corresponding to the multi-path distribution unit through an electrically isolated CAN bus network to perform automatic configuration and expansion of network nodes from top to bottom; and for the data transmission process, efficient and orderly communication transmission of uplink data and downlink command messages is carried out on the basis of automatic node configuration and expansion, so that real-time control management of each component module node of the photovoltaic lithium battery energy storage system under unbalanced management is achieved.
6. The system according to claim 1, wherein the overall power supply capability prediction and the equivalent state of charge estimation of the unbalanced management photovoltaic lithium battery energy storage system are finally obtained through hierarchical node information interaction and distributed calculation based on the prediction of the power supply capability and the equivalent state of charge estimation of the unbalanced management photovoltaic lithium battery energy storage module through a tree network structure of the module communication and control layer, the relay communication layer and the central communication and control layer, so that the power supply reliability of the unbalanced management photovoltaic lithium battery energy storage system is improved.
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Effective date of registration: 20200113 Address after: 610000 No. 2, 1 unit, 5 layer 501-504, No. 801, middle section of Tianfu Road, Chengdu high tech Zone, Sichuan Patentee after: CHENGDU GUOJIA ELECTRICAL ENGINEERING CO., LTD. Address before: 610031 Sichuan City, Chengdu Province, No. two North Ring Road, No. 111 Patentee before: Southwest Jiaotong University |