CN118163696A - Mobile energy storage charging system - Google Patents
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- 238000004146 energy storage Methods 0.000 title claims abstract description 167
- 238000007600 charging Methods 0.000 title claims abstract description 148
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- 238000007599 discharging Methods 0.000 claims abstract description 33
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
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Abstract
The invention provides a mobile energy storage charging system, which belongs to the technical field of mobile energy storage and charging and discharging, and comprises a main body with a hook arm self-discharging system, a box body suitable for the hook arm self-discharging system, a direct current quick charging socket, a direct current high voltage power distribution system, a battery management system, a battery energy storage system, a DC/DC bidirectional control system, an AC/DC bidirectional converter, a DC/DC direct current charger, an AC power distribution system, a UPS system, a fire protection system, an environment control system, a lighting system, a GPS positioning system, an EMS comprehensive energy management control system, a cloud platform monitoring system and a cab vehicle-mounted monitoring platform, wherein the box body is used for mobile energy storage charging; the battery management system includes the steps of: acquiring data of a battery module; when abnormal conditions of the battery module are detected, the battery management system determines an equalization battery power sequence of power distribution; controlling the direct-current high-voltage distribution system to dynamically adjust the electric energy flow direction; while preventing circulation between the battery clusters.
Description
Technical Field
The invention belongs to the technical field of mobile energy storage and charging and discharging, and particularly relates to a mobile energy storage charging system.
Background
With the rapid development of social economy and the wide application of new energy technologies, energy storage systems play an increasingly important role in the fields of power supply, emergency standby power supply, distributed energy management and the like. However, conventional energy storage systems generally suffer from a number of challenges.
Firstly, in terms of deployment flexibility, the conventional energy storage system often adopts a fixed or semi-fixed installation mode, so that the layout of the energy storage system on a geographic space is greatly limited, and the energy storage system is difficult to quickly adapt to power supply requirements in different regions and different scenes. For example, in coping with sudden power shortages, grid faults, or temporary electricity demands in remote areas, the fast response and mobile replenishment capability of conventional energy storage systems is relatively inadequate.
Secondly, the inconvenience of the conventional energy storage system is mainly reflected in the maintenance and operation processes. When abnormal conditions such as aging, performance degradation, overcharge/discharge, abnormal temperature and the like of the single battery occur in the battery module, the battery module is required to be inspected in a manual inspection or shutdown maintenance mode, and the process is long in time consumption and high in cost and can influence the normal operation and efficiency performance of the whole energy storage system. In addition, the capacity of efficient management and optimal utilization of power resources in a battery pack is limited due to the lack of intelligent allocation strategies.
Furthermore, the prior art relies on periodic maintenance detection and passive troubleshooting mechanisms to address abnormal battery problems in the energy storage system. In the mode, once the battery module fails, the stability of the whole energy storage system is easily reduced, and under the condition that an abnormal battery is not found and replaced in time, chain reaction can be possibly caused, the states of other battery units are further deteriorated, and the service life of the whole energy storage system is shortened.
Disclosure of Invention
In view of the above, the present invention provides a mobile energy storage charging system, which is integrated with a carrier vehicle with a hooked arm self-discharging system, so that the energy storage device can flexibly move among a plurality of sites and be rapidly deployed.
The invention is realized in the following way:
The invention provides a mobile energy storage charging system, which comprises a main body with a hooked arm self-discharging system, a box body suitable for the hooked arm self-discharging system, a direct current quick charging socket, a direct current high voltage distribution system, a battery management system, a battery energy storage system, a DC/DC bidirectional control system, an AC/DC bidirectional converter, a DC/DC direct current charger, an AC distribution system, a UPS system, a fire protection system, an environment control system, a lighting system, a GPS positioning system, an EMS comprehensive energy management control system, a cloud platform monitoring system and a cab vehicle-mounted monitoring platform, wherein the box body is used for mobile energy storage charging;
The main body is a carrier of the mobile energy storage charging system and is provided with a plurality of boxes for use in different scenes.
Based on the technical scheme, the mobile energy storage charging system can be further improved as follows:
The battery energy storage system consists of an energy storage battery and is used for storing electric energy;
The direct-current high-voltage distribution system is a direct-current distribution hub of the mobile energy storage charging system and is used for distributing direct current to the battery energy storage system for storage or distributing electric quantity released by the battery energy storage system to the DC/DC bidirectional control system to be used as load electricity;
The DC/DC bidirectional control system consists of a main control board and a DC/DC bidirectional power control module, is assembled by adopting a modularized design and is used for bidirectional power control, voltage stabilization, single-module polling, balancing of battery cluster electric quantity, prevention of inter-cluster circulation and bidirectional isolation;
The DC/DC direct-current charger adopts a DC/DC power module to take electricity from a direct-current bus and converts the energy of the battery energy storage system into charging electric energy;
The AC/DC bi-directional converter is the interface of the battery with the grid or AC load, bidirectional conversion for converting alternating current to direct current and direct current to direct current;
the alternating current power distribution system is a power distribution hub of an alternating current power supply and is used for being in butt joint with alternating current load equipment to supply power to the alternating current load equipment;
The UPS system is composed of a UPS host and a battery energy storage system and is used for supplying power to an EMS comprehensive energy management control system, a fire protection system, a video monitoring system, a GPS positioning system and a battery management system;
The battery management system consists of a battery management unit BMU, a battery cluster management unit BCU and a battery stack management unit BAU and is used for monitoring the state of the battery energy storage system;
The EMS comprehensive energy management control system is used for coordinating and managing the mobile energy storage charging system, sending relevant information to the cloud platform monitoring system and receiving monitoring and scheduling of the cloud platform monitoring system.
Further, the battery management unit BMU provides internal operation state information of the battery module to the battery management system through a communication interface, and is used for managing the charging and discharging processes of the battery module and collecting information of the energy storage battery;
the battery cluster management unit BCU is used for collecting information collected by the battery management unit BMU and forwarding the collected information to the battery management system;
The battery stack management unit BAU is used for connecting the battery management unit BMU and carrying out information interaction with the EMS comprehensive energy management control system and the external direct current charging pile.
Further, the charging includes the following two types: and the external direct current charging pile charges the box body: the battery energy storage system is supplemented by the direct-current charging pile in the charging station through the direct-current quick charging socket and the direct-current high-voltage distribution system;
Alternating current commercial power supplements power for the mobile energy storage charging system: the direct current high voltage distribution system distributes electric energy to the battery energy storage system for storage.
Further, the discharge process is as follows: the battery energy storage system discharges outwards, the direct-current high-voltage distribution system distributes electric energy to the DC/DC bidirectional control system, and the electric energy is discharged outwards through the AC/DC bidirectional converter or the DC/DC direct-current charger.
Wherein, the battery management system includes the following steps:
S10, the battery management system acquires working state data of each battery module in the mobile energy storage charging system in real time, wherein the working state data comprise battery voltage, current, temperature and position information of the battery module in an energy storage container;
S20, when the battery management system detects that the battery module is abnormal, the battery management system adopts an optimal path algorithm according to a preset activity allocation address strategy to obtain a balanced battery electric quantity sequence;
and S30, controlling the direct-current high-voltage distribution system to dynamically adjust the electric energy flow direction by the battery management system according to the balanced battery electric quantity sequence obtained by the optimal path algorithm, and preventing circulation among battery clusters.
The battery management system adopts an innovative activity allocation address strategy and an optimal path algorithm, can monitor the battery state in real time and rapidly adjust the electric quantity allocation priority when abnormal conditions are detected, balances the electric quantity of the battery, and has more electric quantity, more electric quantity and less electric quantity, thereby greatly improving the intelligent level and the operation efficiency of the energy storage system. The series of improvement measures not only solve the limitations of the traditional energy storage system, but also provide a more advanced and reliable solution for the construction of the smart grid and the application of green energy sources in the future.
Further, the specific step S20 is as follows:
The battery management system monitors the voltage, current, temperature and state of charge of each battery module in real time and acquires accurate data;
Regarding each battery module as a node in a network, and constructing a network model reflecting the energy relation among the battery modules by analyzing the difference of available electric quantity;
Calculating a dynamic electric quantity balanced distribution sequence, namely a balanced battery electric quantity sequence, according to the current available electric quantity of each battery module by utilizing an optimal path algorithm;
The battery modules with high available electricity release part of energy by means of resistance consumption or control of charging/discharging speed, and are used for all the battery modules to reach similar charge level.
Further, the balancing battery power sequence specifically includes:
In the charging process, the battery management system performs a current limiting measure on the battery clusters in a high charge state, and simultaneously increases energy transmission to the battery clusters in a low charge state for all the battery clusters to reach a consistent charge level in a safety range;
In the discharging stage, according to the electric quantity balancing principle, limiting the discharging speed of the battery cluster with lower electric quantity, and avoiding overdischarge; while allowing higher capacity battery clusters to increase discharge output for maintaining efficient operation of the entire battery cluster.
Further, the step S30 further includes, when detecting that the battery cluster fails, the battery management system recalculates an equalization battery power sequence according to a preset failure handling policy, and the remaining battery clusters that are in normal operation perform power management according to the equalization battery power sequence.
Further, the optimal path algorithm is based on graph theory, a network model between the battery module and the equipment to be charged is constructed, and an optimal path from the battery module with more available electric quantity to the equipment to be charged is calculated through an optimal path searching algorithm.
Compared with the prior art, the mobile energy storage charging system provided by the invention has the beneficial effects that:
1. Quick response and flexible deployment: the mobile energy storage charging container can be transported to a place with a useful electricity requirement through a carrying vehicle to provide charging, energy storage and other electric power application services, the mobile energy storage charging container can be deployed on the vehicle or can be deployed on a flat ground through a hook arm self-discharging system, one carrying vehicle can be provided with a plurality of energy storage charging containers, the mobile energy storage charging container can be used on site, one mobile energy storage charging container is in the transportation process, one mobile energy storage charging container is in the use requirement of station charging, the use efficiency of the carrying vehicle is improved, the cost input of the carrying vehicle is reduced, and the economic benefit value is extremely high;
2. the electricity supplementing is convenient: the power is supplied to the mobile energy storage charging system through the station direct current charging pile, and the power is supplied to the mobile energy storage charging system through alternating current commercial power;
3. The configured battery management system is compatible with the functional characteristics of the power and energy storage battery management systems, so that the battery power supply of the external charging pile system can be realized by carrying out information interaction with the external charging pile, and the charging and discharging application of the conventional energy storage system can be realized by carrying out information interaction with the EMS comprehensive energy management control system, compared with the conventional battery management system, the battery management system has stronger and more comprehensive functions;
4. maintenance and overhaul are convenient: the whole system adopts the container and the modularized design, and is more convenient to maintain and overhaul.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a battery management system of a mobile energy storage charging system;
FIG. 2 is an exemplary diagram of a mobile energy storage charging system;
FIG. 3 is a topology of a mobile energy storage charging system;
FIG. 4 is a network topology of a mobile energy storage charging system;
In the drawings, the list of components represented by the various numbers is as follows:
10. a main body; 20. a box body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 2, the present invention provides an illustration of a first embodiment of a mobile energy storage charging system, in this embodiment, the mobile energy storage charging system includes a main body 10 with a hook arm self-discharging system, a box body suitable for the hook arm self-discharging system, a direct current fast charging socket, a direct current high voltage distribution system, a battery management system, a battery energy storage system, a DC/DC bidirectional control system, an AC/DC bidirectional converter, a DC/DC direct current charger, an AC distribution system, a UPS system, a fire protection system, an environmental control system, a lighting system, a GPS positioning system, an EMS comprehensive energy management control system, a cloud platform monitoring system, a cab vehicle-mounted monitoring platform, and the box body is used for mobile energy storage charging;
the main body is a carrier of the mobile energy storage charging system and is provided with a plurality of boxes for use in different scenes.
Further, the battery energy storage system consists of an energy storage battery and is used for storing electric energy;
The direct-current high-voltage distribution system is a direct-current distribution hub of the mobile energy storage charging system and is used for distributing direct current to the battery energy storage system for storage or distributing electric quantity released by the battery energy storage system to the DC/DC bidirectional control system to be used as load electricity;
The DC/DC bidirectional control system consists of a main control board and a DC/DC bidirectional power control module, is assembled by adopting a modularized design and is used for bidirectional power control, voltage stabilization, single-module polling, balancing of battery cluster electric quantity, prevention of inter-cluster circulation and bidirectional isolation;
the DC/DC direct-current charger adopts a DC/DC power module to take electricity from a direct-current bus and converts the energy of the battery energy storage system into charging electric energy;
the AC/DC bi-directional converter is the interface of the battery with the grid or AC load, bidirectional conversion for converting alternating current to direct current and direct current to direct current;
The alternating current power distribution system is a power distribution hub of an alternating current power supply and is used for being in butt joint with alternating current load equipment to supply power to the alternating current load equipment;
The UPS system is composed of a UPS host and a battery energy storage system and is used for supplying power to the EMS comprehensive energy management control system, the fire control system, the video monitoring system, the GPS positioning system and the battery management system;
The battery management system consists of a battery management unit BMU, a battery cluster management unit BCU and a battery stack management unit BAU and is used for monitoring the state of the battery energy storage system;
The EMS comprehensive energy management control system is used for coordinating and managing the mobile energy storage charging system, sending relevant information to the cloud platform monitoring system and receiving monitoring and scheduling of the cloud platform monitoring system.
Further, the battery management unit BMU provides internal running state information of the battery module for the battery management system through the communication interface, and is used for managing the charging and discharging processes of the battery module and collecting information of the energy storage battery;
The battery cluster management unit BCU is used for collecting information collected by the battery management unit BMU and forwarding the collected information to the battery management system;
the battery stack management unit BAU is used for connecting the battery management unit BMU and carrying out information interaction with the EMS comprehensive energy management control system and the external direct current charging pile.
Further, the charging includes the following two types: the external dc charging stake charges the case 20: the battery energy storage system is supplemented by the direct-current charging pile in the charging station through the direct-current quick charging socket and the direct-current high-voltage distribution system;
alternating current commercial power supplements power for the mobile energy storage charging system: the direct current high voltage distribution system distributes electric energy to the battery energy storage system for storage.
Further, the discharge process is as follows: the battery energy storage system discharges outwards, the direct current high-voltage distribution system distributes electric energy to the DC/DC bidirectional control system, and the electric energy is discharged outwards through the AC/DC bidirectional converter or the DC/DC direct current charger.
As shown in fig. 1, the battery management system includes the steps of:
S10, the battery management system acquires working state data of each battery module in the mobile energy storage charging system in real time, wherein the working state data comprises battery voltage, current, temperature and position information of the battery module in an energy storage container;
s20, when the battery management system detects that the battery module is abnormal, the battery management system adopts an optimal path algorithm according to a preset activity allocation address strategy to obtain a balanced battery electric quantity sequence;
S20, specifically comprises the following steps:
The battery management system monitors the voltage, current, temperature and state of charge of each battery module in real time and acquires accurate data;
each battery module is regarded as a node in the network, and a network model reflecting the energy relation among the battery modules is constructed by analyzing the difference of available electric quantity;
calculating a dynamic electric quantity balanced distribution sequence, namely a balanced battery electric quantity sequence, according to the current available electric quantity of each battery module by utilizing an optimal path algorithm;
by means of resistor consumption or control of charging/discharging speed, partial energy is released from the available high-electricity battery modules for all battery modules to reach similar charge level.
The equalization battery power sequence specifically comprises the following steps:
In the charging process, the battery management system performs a current limiting measure on the battery clusters in a high charge state, and simultaneously increases energy transmission to the battery clusters in a low charge state for all the battery clusters to reach a consistent charge level in a safety range;
In the discharging stage, according to the electric quantity balancing principle, limiting the discharging speed of the battery cluster with lower electric quantity, and avoiding overdischarge; while allowing higher capacity battery clusters to increase discharge output for maintaining efficient operation of the entire battery cluster.
And S30, controlling the direct-current high-voltage distribution system to dynamically adjust the electric energy flow direction by the battery management system according to the balanced battery electric quantity sequence obtained by the optimal path algorithm, and preventing circulation among battery clusters.
Step S30 also includes that when the battery cluster is detected to have faults, the battery management system recalculates the balanced battery power sequence according to a preset fault coping strategy, and the remaining battery clusters which are normally operated perform power management according to the balanced battery power sequence.
The optimal path algorithm refers to a class of algorithms used in graph theory and computer science to find the optimal path from one vertex to another vertex in a graph (directed graph or undirected graph). "optimal" here generally refers to the shortest, fastest, least costly, etc. path that meets a particular optimization objective. The following are some typical optimal path algorithms:
Dijkstra algorithm:
The problem of single source shortest paths in directed or undirected graphs with non-negative weighted edges was proposed by the netherlands computer scientist Ai Cige, dike stoner in 1956.
The algorithm updates the shortest estimated distance of each vertex to the starting vertex step by step and ensures that the resulting distance is optimal.
Bellman-Ford algorithm:
the case containing negative weight edges can be handled, but provided that there is no negative weight loop in the figure.
It computes a single source shortest path by iteratively relaxing all edges.
Floyd-Warshall algorithm:
the method is a dynamic programming algorithm, can calculate the shortest path between any two points in the graph, and is not limited to the single-source problem.
It recursively determines the effect of all possible intermediate vertices on the shortest path by filling a matrix.
Search algorithm:
is a heuristic search algorithm that uses additional information (typically based on euclidean distance or other valuation function) in solving the shortest path, thereby improving efficiency.
The algorithm a combines the actual cost and the predicted cost to guide the search process, and is particularly suitable for the problem of road finding, such as character navigation in game AI.
Breadth-first search (BFS):
In an unweighted graph, the BFS may find the shortest path directly from the start point to the end point, where "shortest" refers to the least number of edges.
BFS may be used in practice to detect whether there is a path from a node to all other nodes.
Depth First Search (DFS):
DFS is not directly used to find the shortest path, but in some scenarios (e.g., tree structures or cases where all paths need to be traversed), the "optimality" in a special sense can be achieved by appropriate modification.
Further, the specific steps of preventing the circulation among the battery clusters are as follows:
and (3) real-time monitoring: firstly, a battery management system continuously monitors key parameters such as voltage, current, temperature and the like of each battery cluster and the electric energy transmission state between the key parameters through a high-precision sensor;
And (3) calculating an optimal path: when the unbalanced electric quantity is detected, the system adopts a preset optimal path algorithm, and a dynamic energy distribution sequence for avoiding or reducing the circulation is accurately calculated based on factors such as the actual state of charge (SOC), capacity, internal resistance and the like of each battery cluster;
Intelligent control decision: according to the priority order obtained by the algorithm, the battery management system guides a power converter, a relay or other switching elements in the direct-current high-voltage distribution system to operate, and selectively opens or closes a current path to ensure that energy flows according to an optimized path;
Closed loop feedback adjustment: after the electric energy flow direction adjustment is implemented, the electric parameters among the battery clusters are continuously monitored in real time, and the result is fed back to the control system so as to realize closed-loop dynamic adjustment. If there is still sign of circulation, the system will further fine tune the control strategy until the non-efficient energy cycle is eliminated;
Fault isolation and redundancy design: for the fault battery clusters which possibly cause circulation, the system can timely identify and take isolation measures, and meanwhile, the redundancy capacity of other healthy battery clusters is utilized to maintain the normal operation of the whole energy storage system, so that the circulation problem caused by the abnormality of a single battery cluster is fundamentally prevented.
Further, the optimal path algorithm is based on graph theory, a network model between the battery module and the equipment to be charged is built, and an optimal path from the battery module with more available electric quantity to the equipment to be charged is calculated through an optimal path searching algorithm.
As shown in fig. 2, an illustration of a second embodiment of a mobile energy storage charging system is provided in the present invention, where in the present embodiment, the mobile energy storage charging container box, the direct current fast charging socket system, the direct current high voltage distribution system, the battery energy storage system, the battery bidirectional DC/DC control system, the AC/DC bidirectional converter, the DC/DC charging pile system, the AC distribution system, the UPS system, the fire protection system, the environmental control system, the lighting system, the GPS positioning system, the EMS integrated energy management control system, the cloud platform monitoring system, the cab vehicle-mounted monitoring platform, and the like are suitable for the hook arm self-discharging system;
As shown in fig. 3 and 4, the mobile energy storage charging system is illustrated in an exemplary transportation and deployment diagram: the carrier vehicle with the hook arm self-discharging system is a carrier of the movable energy storage charging system, and the movable energy storage charging container is transported to a place with a useful electricity requirement for energy storage and charge and discharge application. The vehicle can be deployed on the ground or can be deployed on the flat ground by unloading the hook arm self-unloading system. A carrier vehicle can be equipped with a plurality of energy storage charging containers, can satisfy a mobile energy storage charging container and use on the spot, and a mobile energy storage charging container is in transit, and a mobile energy storage charging container is in the use demand of station yard charging, has improved carrier vehicle's availability factor, reduces carrier vehicle cost input, and economic benefits value is high.
The mobile energy storage charging container is charged by the direct current charging pile in the external charging station: the direct-current charging pile in the charging station can supplement electricity for the battery energy storage system through the direct-current quick charging socket and the direct-current high-voltage distribution system, the direct-current quick charging socket is a standard national standard socket, and the charging accords with the charging mode and flow of the charging pile in the national standard.
The mobile energy storage charging container is supplemented with electricity through alternating current commercial power: the battery energy storage system can be supplemented by commercial power through an AC/DC bidirectional converter, a DC/DC bidirectional control system and a DC high-voltage distribution system.
The external electric vehicle is supplemented with electricity through a vehicle-mounted DC/DC direct-current charger: the electric quantity stored by the battery energy storage unit is charged into external electric vehicles such as electric vehicles, electric engineering vehicles and the like through the direct-current high-voltage distribution unit, the DC/DC bidirectional control system and the vehicle-mounted DC/DC direct-current charger.
The alternating current distribution system is connected with the commercial power to discharge outwards: the electric quantity stored by the battery energy storage unit is connected into a power grid for external discharge through a direct current high-voltage power distribution unit, a DC/DC bidirectional control system, an AC/DC bidirectional converter and an AC power distribution system, and is used for relevant applications such as peak clipping and valley filling of energy storage, emergency power supply and the like.
Supplying power to the station power system through the alternating current power distribution system: the electric quantity stored by the battery energy storage unit is supplied to loads for stations such as a UPS system, an environment control system, a lighting system and the like through a direct current high-voltage distribution unit, a DC/DC bidirectional control system, an AC/DC bidirectional converter and an AC distribution system.
1. The battery energy storage unit mainly comprises an energy storage battery and is mainly used for storing electric energy.
2. The direct-current high-voltage power distribution unit is a direct-current power distribution junction of the mobile energy storage charging system, and can not only distribute externally input direct current or converted direct current to the battery energy storage system for storage, but also distribute electric quantity released by the battery energy storage system to the DC/DC bidirectional control system to be used as load power.
(1) When the movable energy storage and charging system is supplemented with electricity through the station direct-current charging pile, the direct-current high-voltage power distribution unit can distribute direct current to the battery energy storage unit for storage, and can distribute electric energy to the DC/DC bidirectional control system, and power is supplied to the station load through the AC/DC bidirectional converter and the alternating-current power distribution system;
(2) When the alternating current commercial power supplements power for the mobile energy storage charging system, the direct current high-voltage distribution unit distributes electric energy to the battery energy storage unit for storage;
(3) When the battery energy storage unit discharges outwards, the direct-current high-voltage distribution unit distributes electric energy to the DC/DC bidirectional control system, and discharges outwards through the AC/DC bidirectional converter or the vehicle-mounted DC/DC direct-current charger.
3. The DC/DC bidirectional control system consists of a main control board and a DC/DC bidirectional power control module, is flexibly assembled by adopting a modularized design, and has the functions of bidirectional power control, voltage stabilization, single-module polling, balancing of electric quantity of a battery cluster, prevention of inter-cluster circulation, bidirectional isolation and the like.
4. The vehicle-mounted DC/DC direct-current charger adopts a DC/DC power module to directly take electricity from a direct-current bus and convert the energy of a battery storage unit into charging electric energy of a new energy automobile. Compared with the traditional AC/DC charger, the invention directly takes power from the direct current power supply, and reduces the energy loss in the process of converting DC/AC into AC/DC. The vehicle-mounted DC/DC charger meets the requirements of high-power single-gun charging and double-gun simultaneous charging, and the charging accords with the charging mode and the charging flow of the charging pile of the national standard.
5. The AC/DC bidirectional converter is an interface between a battery and a power grid or an alternating current load, and mainly has the function of realizing bidirectional conversion between alternating current and direct current, so that the quality and dynamic characteristics of electric energy output by the battery energy storage system are determined, and the safety and the service life of the battery are greatly influenced. When the alternating current commercial power is used for supplementing electricity to the mobile energy storage charging container, the alternating current is converted into direct current by the AC/DC bidirectional converter, and when the alternating current distribution system is used for supplying electricity to stations or discharging the commercial power to the outside, the alternating current is converted into alternating current by the AC/DC bidirectional converter.
6. The alternating current power distribution system is a power distribution hub of an alternating current power supply, is in butt joint with alternating current load equipment to supply power to the alternating current load equipment, and is in butt joint with commercial power to be used for peak clipping and valley filling of energy storage.
7. The UPS system is composed of a UPS host and a high-capacity standby battery energy storage unit, and is mainly used for providing a reliable uninterrupted power supply for an EMS comprehensive energy management control system, a fire protection system, a video monitoring system, a GPS positioning system and a BMS battery management system. When the system is in normal operation, the AC side of the AC/DC bidirectional converter is in power supply for the system through the UPS bypass, when the system is in standby and energy-saving modes, the PCS is deactivated, the power is supplied for the system through the high-capacity standby battery energy storage unit and the inversion system of the UPS, and when the battery is reduced to the set electric quantity, the EMS automatically controls the PCS to start for supplementing power for the high-capacity standby battery energy storage unit.
8. The environment control system consists of an intelligent air conditioner, a temperature sensor, a fan, an air duct and the like, and automatically adjusts the temperature of the cabin according to a set value, so that a proper operation environment is provided for the mobile energy storage charging system.
9. The fire protection system provides safety guarantee for the movable energy storage charging vehicle to prevent thermal runaway. The fire-fighting system serving as an important fire-fighting means of the energy storage power station can sense the thermal runaway characteristics of the lithium battery of the energy storage power station at the first time and make a correct instruction at the first time, so that the thermal runaway of the battery is controlled at the initial stage of germination, and the thermal spread of the battery can be effectively restrained.
10. The video monitoring system consists of a video management unit and front-end equipment, and is used for monitoring the appearance running state, security alarm and auxiliary equipment of the equipment in the station.
11. The lighting system is used as an auxiliary facility of the mobile energy storage charging system, and is mainly used for providing reliable lighting for overhauling and debugging the system.
12. The battery management system is one of core subsystems of the mobile energy storage charging system and mainly comprises three parts of a battery management unit BMU, a battery cluster management unit BCU and a battery stack management unit BAU, and the systems of the parts are in hierarchical interaction to jointly realize the functions of state monitoring, strategy control, alarm response, protection action and the like of the battery energy storage unit.
(1) The BMU is a battery module management unit, is the minimum composition management unit of the battery management system, and provides internal running state information of the battery module for the battery cluster management system through a communication interface. The battery module has the functions of monitoring the voltage and the temperature of the single batteries in the battery module, safely managing the charging and discharging processes of the battery module, acquiring information such as the voltage and the temperature of each single battery in the package, balancing the batteries in the package, sending information, managing heat and the like. When a fault is detected, the BMU can alarm abnormal phenomena such as over-high single voltage, over-low single voltage, single voltage differential pressure, over-high temperature, over-low temperature, over-large temperature differential value, charging current, discharging current and the like, and send relevant information to a battery management unit of the previous level;
(2) The BCU is a battery cluster management unit, is a middle level of the battery management system, collects information collected by the battery module management unit downwards, and forwards the collected information to an upper battery array management unit. And the safety management is effectively carried out on the charge and discharge processes of the battery clusters, and the alarm and emergency protection treatment is carried out on possible faults. The BCU is provided with current collection, total voltage collection and leakage detection of the battery cluster, and drives to disconnect the high-voltage power contactor when the state of the battery pack is abnormal, so that the battery cluster is withdrawn from operation, and safe, reliable and stable operation of the battery is ensured. Meanwhile, capacity calibration and SOC calibration can be independently completed under the management of the BMS, and the corrected latest battery system capacity and SOC calibration value are obtained through a self algorithm and are used as the basis for the charge and discharge management of the subsequent battery;
(3) The BAU is a battery array management unit, is the highest level in the whole battery management system, is downwards connected with each battery cluster management unit, and is upwards in information interaction with the EMS integrated energy management control system and the external charging pile, so that the batteries of the whole energy storage battery stack are centrally managed, and the safe, reliable and stable operation of the batteries is ensured. Its main functions include:
① Charging and discharging management of the battery array;
② Self-checking and fault diagnosis alarming of the system;
③ Diagnosing and alarming faults of the battery pack;
④ Safety protection of various anomalies and fault conditions within the battery array;
⑤ Communicating with other devices such as a power conversion system, a monitoring and scheduling management system and the like;
⑥ Data storage, transmission and processing functions: the latest alarm information, reset information and sampling abnormal information of the system are stored, and the stored information can be derived according to the need;
⑦ And the system self-checking function performs self-checking on the whole BMS system according to the data sent by each battery management unit, so that the normal operation of the system is ensured.
The battery management system in the patent is compatible with the functional characteristics of the power and energy storage battery management systems, can perform information interaction with the external charging pile to realize battery power supply of the external charging pile system, and can perform information interaction with the EMS comprehensive energy management control system to realize charge and discharge application of the conventional energy storage system, and compared with the traditional battery management system, the battery management system has stronger and more comprehensive functions.
13. The EMS comprehensive energy management control system is used as a core center of the system and is responsible for coordination and management of the whole mobile energy storage charging system, and is an important guarantee that each independent device and subsystem of the system can operate uniformly, orderly, safely and efficiently.
The EMS comprehensive energy management control system mainly comprises a basic platform, application software, a human-computer interface and the like, and is connected with each functional unit through communication to realize communication and interaction of equipment data. And acquiring data such as telemetry, remote signaling, electricity degree and the like of each functional unit of the system in real time, and transmitting related instructions to each functional unit after analyzing and processing the acquired information, so as to realize system monitoring and strategy management.
The EMS comprehensive energy management control system has rich and various application functions, including functions of battery SOC management, PCS power control, control mode switching, data acquisition, data processing, system alarm, control operation, accident recall, scheduling management, electricity price output, balance output and the like; the system has various control strategies and applications, including a station DC charging pile system power supply control strategy, a commercial power supply control strategy, a peak clipping and valley filling control strategy, an emergency power supply control strategy, a power on/off control strategy, other control strategies customized by customers and the like.
The EMS comprehensive energy management control system can also issue relevant information to the cloud platform monitoring system through the cloud, and receive monitoring and scheduling of the cloud platform monitoring system. Or the information is issued to the vehicle-mounted monitoring system of the cab through WIFI, and the monitoring and dispatching of the vehicle-mounted monitoring system of the cab are received.
14. The cloud platform monitoring system has the functions of real-time monitoring, multi-terminal integration, intelligent operation and maintenance, scheduling, energy management, life analysis, remote upgrading and the like. The cloud edge end coordinated operation is realized by the system by utilizing big data and intelligent Internet of things technology. The mobile energy storage charging system data can be issued to the cloud platform, control instructions can be subscribed from the cloud platform, remote control functions, combination of remote centralized control and local control, AI (advanced technology) holding and the like are realized, meanwhile, protocol expansion of the self-owned cloud platform is supported, cloud architecture deployment and dynamic expansion are supported, and monitoring can be performed on equipment such as a vehicle-mounted monitoring system of a cab and a mobile phone.
15. The GPS positioning system is configured in the system, the vehicle track is inquired in real time, and the positioning information can be uploaded to the cloud platform system and the cab vehicle-mounted monitoring system, so that a driver can master the position information of the energy storage system anytime and anywhere, the vehicle dispatching is facilitated, and the use efficiency of the carrier vehicle is improved.
16. The vehicle-mounted monitoring system of the cab is in butt joint with the cloud platform monitoring system through the cloud, relevant data information of each mobile energy storage charging container is monitored in real time, cloud scheduling information is received, and transfer of the mobile energy storage charging containers is carried out. And the linkage of the EMS and the vehicle-mounted monitoring system of the cab can be realized through WIFI release, and the vehicle-mounted monitoring system has the same display and setting functions as the man-machine interface of the EMS integrated energy management control system in the container, but the setting functions of important parameters are limited. The system can be monitored and controlled by a cab on-board monitoring system.
Specifically, the principle of the invention is as follows: the EMS comprehensive energy management control system is used as a core center of the system and is responsible for coordination and management of the whole mobile energy storage charging system, and is an important guarantee that each independent device and subsystem of the system can operate uniformly, orderly, safely and efficiently; the EMS comprehensive energy management control system is connected with each functional unit through communication to realize communication and interaction of equipment data. The method comprises the steps of collecting data such as telemetry, remote signaling, electric power and the like of each functional unit of the system in real time, and sending relevant instructions to each functional unit after analysis and processing of collected information, so that system monitoring and strategy management are realized;
the battery management system is one of core subsystems of the mobile energy storage charging system and mainly comprises three parts of a battery management unit BMU, a battery cluster management unit BCU and a battery stack management unit BAU, and the systems of the parts are in hierarchical interaction to jointly realize the functions of state monitoring, strategy control, alarm response, protection action and the like of the battery energy storage unit. The battery management system is compatible with the functional characteristics of the power and energy storage battery management systems, so that the battery power supply of the external charging pile system can be realized by carrying out information interaction with the external charging pile, and the charging and discharging application of the conventional energy storage system can be realized by carrying out information interaction with the EMS comprehensive energy management control system.
Claims (10)
1. The mobile energy storage charging system is characterized by comprising a main body (10) with a hook arm self-discharging system, a box body (20) suitable for the hook arm self-discharging system, a direct current quick charging socket, a direct current high voltage distribution system, a battery management system, a battery energy storage system, a DC/DC bidirectional control system, an AC/DC bidirectional converter, a DC/DC direct current charger, an AC distribution system, a UPS system, a fire protection system, an environment control system, a lighting system, a GPS positioning system, an EMS comprehensive energy management control system, a cloud platform monitoring system and a cab vehicle-mounted monitoring platform, wherein the box body (20) is used for mobile energy storage charging;
The main body (10) is a carrier of the mobile energy storage charging system, and the main body (10) is provided with a plurality of boxes (20) for use in different scenes.
2. A mobile energy storage and charging system according to claim 1, wherein said battery energy storage system is comprised of energy storage batteries for electrical energy storage;
The direct-current high-voltage distribution system is a direct-current distribution hub of the mobile energy storage charging system and is used for distributing direct current to the battery energy storage system for storage or distributing electric quantity released by the battery energy storage system to the DC/DC bidirectional control system to be used as load electricity;
The DC/DC bidirectional control system consists of a main control board and a DC/DC bidirectional power control module, is assembled by adopting a modularized design and is used for bidirectional power control, voltage stabilization, single-module polling, balancing of battery cluster electric quantity, prevention of inter-cluster circulation and bidirectional isolation;
The DC/DC direct-current charger adopts a DC/DC power module to take electricity from a direct-current bus and converts the energy of the battery energy storage system into charging electric energy;
The AC/DC bi-directional converter is the interface of the battery with the grid or AC load, bidirectional conversion for converting alternating current to direct current and direct current to direct current;
the alternating current power distribution system is a power distribution hub of an alternating current power supply and is used for being in butt joint with alternating current load equipment to supply power to the alternating current load equipment;
The UPS system is composed of a UPS host and a battery energy storage system and is used for supplying power to an EMS comprehensive energy management control system, a fire protection system, a video monitoring system, a GPS positioning system and a battery management system;
The battery management system consists of a battery management unit BMU, a battery cluster management unit BCU and a battery stack management unit BAU and is used for monitoring the state of the battery energy storage system;
The EMS comprehensive energy management control system is used for coordinating and managing the mobile energy storage charging system, sending relevant information to the cloud platform monitoring system and receiving monitoring and scheduling of the cloud platform monitoring system.
3. The mobile energy storage and charging system according to claim 2, wherein the battery management unit BMU provides internal operation state information of the battery module to the battery management system through a communication interface, and is used for managing the charging and discharging processes of the battery module and collecting energy storage battery information;
the battery cluster management unit BCU is used for collecting information collected by the battery management unit BMU and forwarding the collected information to the battery management system;
The battery stack management unit BAU is used for connecting the battery management unit BMU and carrying out information interaction with the EMS comprehensive energy management control system and the external direct current charging pile.
4. A mobile energy storage charging system according to claim 3, wherein charging comprises two of: the external direct current charging pile charges the box body (20): the battery energy storage system is supplemented by the direct-current charging pile in the charging station through the direct-current quick charging socket and the direct-current high-voltage distribution system;
Alternating current commercial power supplements power for the mobile energy storage charging system: the direct current high voltage distribution system distributes electric energy to the battery energy storage system for storage.
5. The mobile energy storage and charging system of claim 4, wherein the discharging process is: the battery energy storage system discharges outwards, the direct-current high-voltage distribution system distributes electric energy to the DC/DC bidirectional control system, and the electric energy is discharged outwards through the AC/DC bidirectional converter or the DC/DC direct-current charger.
6. The mobile energy storage charging system of claim 5, wherein the battery management system comprises the steps of:
S10, the battery management system acquires working state data of each battery module in the mobile energy storage charging system in real time, wherein the working state data comprise battery voltage, current, temperature and position information of the battery module in an energy storage container;
S20, when the battery management system detects that the battery module is abnormal, the battery management system adopts an optimal path algorithm according to a preset activity allocation address strategy to obtain a balanced battery electric quantity sequence;
and S30, controlling the direct-current high-voltage distribution system to dynamically adjust the electric energy flow direction by the battery management system according to the balanced battery electric quantity sequence obtained by the optimal path algorithm, and preventing circulation among battery clusters.
7. The mobile energy storage charging system of claim 6, wherein the step S20 comprises:
The battery management system monitors the voltage, current, temperature and state of charge of each battery module in real time and acquires accurate data;
Regarding each battery module as a node in a network, and constructing a network model reflecting the energy relation among the battery modules by analyzing the difference of available electric quantity;
Calculating a dynamic electric quantity balanced distribution sequence, namely a balanced battery electric quantity sequence, according to the current available electric quantity of each battery module by utilizing an optimal path algorithm;
The battery modules with high available electricity release part of energy by means of resistance consumption or control of charging/discharging speed, and are used for all the battery modules to reach similar charge level.
8. The mobile energy storage charging system of claim 7, wherein the equalization battery charge sequence is specifically:
In the charging process, the battery management system performs a current limiting measure on the battery clusters in a high charge state, and simultaneously increases energy transmission to the battery clusters in a low charge state for all the battery clusters to reach a consistent charge level in a safety range;
In the discharging stage, according to the electric quantity balancing principle, limiting the discharging speed of the battery cluster with lower electric quantity, and avoiding overdischarge; while allowing higher capacity battery clusters to increase discharge output for maintaining efficient operation of the entire battery cluster.
9. The mobile energy storage charging system of claim 8, wherein step S30 further comprises, when detecting that a battery cluster fails, the battery management system recalculates an equalization battery power sequence according to a preset failure handling policy, and the remaining battery clusters that are operating normally perform power management according to the equalization battery power sequence.
10. The mobile energy storage charging system according to claim 9, wherein the optimal path algorithm is based on graph theory, a network model between a battery module and a device to be charged is built, and an optimal path from the battery module with more available electric quantity to the device to be charged is calculated through an optimal path searching algorithm.
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