Control method of multi-path marine storage battery charging and discharging device

Abstract

The invention relates to a control method of a multi-path marine storage battery charging and discharging device, which adopts one charging and discharging device to control multi-path storage batteries to charge and discharge at the same time, and comprises three working conditions of normal working condition charging and discharging, mutual standby charging and discharging and parallel charging and discharging. The charging and discharging device comprises a plurality of charging and discharging units, a display control unit and a power distribution unit; the display control unit is a touch screen with an operating system and serves as a man-machine interaction interface and a general dispatching unit of the charging and discharging device, the power distribution unit comprises a plurality of 2P direct current contactors, the 2P direct current contactors are controlled by the display control unit in a time-sharing mode, and the charging and discharging unit is formed by connecting a plurality of same bidirectional charging and discharging modules in parallel. And each module operates independently and is only controlled by the display control unit for scheduling. According to the invention, three working conditions of normal charging and discharging, mutual standby charging and discharging and parallel charging and discharging of multiple paths of storage battery packs can be flexibly realized by multiple paths of charging and discharging units in a single device, the reliability of charging and discharging operation of the storage battery is improved, and uninterrupted power supply of the marine storage battery is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic control, and specifically to a multi-channel marine battery charge and discharge device based on centralized scheduling and its control method, which is applicable to the ship emergency system requiring high-reliability power supply. Background Art

[0002] As an important component device in the marine emergency power supply system, there are multiple charge and discharge branches in one charge and discharge device, which need to charge and discharge multiple large-capacity battery packs simultaneously, and need to have working conditions such as one-to-one normal condition charge and discharge, mutual standby charge and discharge of multiple branches, and parallel charge and discharge.

[0003] The traditional marine charge and discharge device connects the charge and discharge unit and the battery manually by operating each circuit breaker, and manually disconnects it after charging. The operation is troublesome and the inrush current is large. Information interaction between each module in the charge and discharge unit of the device is carried out through hard wires or communication to adjust its own operating state in real time. The control is complex, and uneven current or inconsistent states may occur. For example, the patent document CN118074088A proposes a rotation charge and discharge scheme for modular power supplies, but does not solve the problem of flexible switching of multiple working conditions; the patent document CN106443489A focuses on the internal resistance detection of a single cell and does not involve multi-channel collaborative control. Therefore, there is an urgent need for a control method for a multi-channel marine battery charge and discharge device that integrates intelligent scheduling, multi-mode switching, and low-inrush startup. Summary of the Invention

[0004] The present invention aims to provide a control method for a multi-channel marine battery charge and discharge device. Using the display control unit as the man-machine interface and the main control and scheduling of multiple charge and discharge unit branches and the power distribution unit, it can quickly and flexibly realize working conditions such as normal charge and discharge, mutual standby charge and discharge, and parallel charge and discharge of multiple batteries. The control method is simple, the inrush current during startup and shutdown is small, and it will not cause damage to the battery. It can be widely applied in marine battery charge and discharge devices.

[0005] To achieve the above object, the technical solution of the present invention is: a control method for a multi-channel marine battery charging and discharging device, characterized in that 1 charging and discharging device is used to simultaneously control the charging and discharging of multiple batteries, including three working conditions: normal working condition charging and discharging, mutual standby charging and discharging, and parallel charging and discharging; the charging and discharging device includes multiple charging and discharging units, a display and control unit, and a power distribution unit; the display and control unit is a touch screen with an operating system, serving as the human-machine interaction interface and the general dispatching unit of the charging and discharging device, communicating with each charging and discharging unit through the CAN bus, and controlling the contactors of the power distribution unit through the I / O interface; the power distribution unit includes multiple 2P DC contactors, and the 2P DC contactors are controlled by the display and control unit in a time-sharing manner. The charging and discharging units are composed of multiple identical bidirectional charging and discharging modules connected in parallel. Each module operates independently and is only controlled by the scheduling of the display and control unit. There is no direct communication between the modules, and the status synchronization is achieved by the unified instruction issued by the display and control unit; this control method includes a startup operation control method and a shutdown operation control method, where:

[0006] The startup operation control method includes the following steps:

[0007] (1) Receive the user instruction and judge whether the charging and discharging mode is parallel charging and discharging or single-group charging and discharging;

[0008] (2) If it is parallel charging and discharging, verify the consistency of the charging and discharging directions, and control the multi-channel charging and discharging units to be connected in parallel to the target battery pack;

[0009] (3) If it is single-group charging and discharging, select the normal working condition or the mutual standby working condition according to the preset logic, and control the charging and discharging unit to be correspondingly connected to the battery pack;

[0010] (4) Dynamically allocate the number of charging and discharging modules, calculate the required number of modules based on the total current and the rated current of the module, and start the modules to complete constant-current charging and discharging;

[0011] (5) Trigger shutdown and alarm when the module runs abnormally, and delay disconnecting the contactor after the charging and discharging is completed.

[0012] The shutdown operation control method includes:

[0013] (1) If it is parallel charging and discharging, send a shutdown instruction to all modules and wait to disconnect the contactor after they are turned off;

[0014] (2) If it is single-group charging and discharging, only turn off the modules of the specified branch and keep the other branches running.

[0015] Further, the display and control unit displays the operation information of the charge and discharge device through the human-machine interface and the general dispatching unit, collects the command information set by the user, calculates and judges, and then issues it to the corresponding charge and discharge module in the charge and discharge unit that needs to be powered on through CAN commands, and outputs signals to control the opening and closing of multiple contactors in the power distribution unit; the display and control unit provides three working condition selection pages in the human-machine interface, generates a command sequence after receiving the battery pack number and charge and discharge parameters set by the user, and displays the operation status and alarm information in real time.

[0016] Further, the front stage of the bidirectional charge and discharge module uses a PWM rectifier to stabilize the bus voltage, the rear stage uses a Buck-Boost+LLC topology to achieve bidirectional energy flow, and a soft start circuit is provided on the DC side to suppress the inrush current.

[0017] Further, if the bidirectional charge and discharge module fails to successfully feedback the power-on signal continuously for 2 seconds during startup, the display and control unit automatically triggers the shutdown process and pops up a window to prompt the fault branch number.

[0018] Further, the charging process adopts a three-stage control of constant current - equalizing charge - floating charge. The equalizing charge voltage and floating charge voltage are dynamically adjusted by the display and control unit, and the switching conditions are matched according to the real-time voltage of the battery pack.

[0019] Further, the charge and discharge device supports the dynamic mapping of charge and discharge branches and battery packs. Any charge and discharge branch can be cross-connected to a battery pack with a non-corresponding number to achieve the function of mutual backup.

[0020] Further, the power distribution unit consists of n 2P DC contactors, where n is the product of the number of branches K of the charge and discharge unit and the number of battery packs M, and the branch numbers of the charge and discharge unit are K1 to K k and the battery pack numbers are M1 to M m , and receives the control of the display and control unit to perform opening and closing operations.

[0021] Further, in the normal working condition of charge and discharge, the bidirectional charge and discharge unit of branch K y charges or discharges the battery pack M x , where x = y; in the cross charge and discharge, the bidirectional discharge unit of branch K y charges or discharges the battery pack M x , where x ≠ y; this working condition is when a certain charge and discharge branch K y fails, and other charge and discharge branches are used to charge and discharge the battery pack M y to ensure the power continuity of the power supply equipment of the battery pack; in the parallel charge and discharge, for branch K y , y = 1, 2,... k, the bidirectional discharge unit charges or discharges the battery pack M x , where Ky For any 2 to k paths among K1 to K k and M is any 1 path among M1 to M; when the capacity of a certain battery pack is lower than the set threshold and strong charging is required, multiple branches are used in parallel to charge the battery, reducing the charging time. x For any 1 path among M1 to M x ; in this operating condition, when the capacity of a certain battery pack is lower than the set threshold and strong charging is required, multiple branches are used in parallel to charge the battery, reducing the charging time.

[0022] Furthermore, the specific steps of the startup operation control method are as follows:

[0023] 1) After the human-machine interface receives the start instruction, perform the following operation response steps of the display control unit: Determine whether it is parallel charge and discharge or single-group charge and discharge unit charge and discharge? If it is parallel charge and discharge, perform step 2); if it is single-group charge and discharge, perform step 4);

[0024] 2) Determine whether the charge and discharge units required for parallel output are all for charging or discharging? If the charge / discharge requirements are the same, perform step 3); if the charge / discharge requirements are inconsistent, do not respond to this human-machine operation, the device gives an audible and visual alarm, and there is a pop-up window on the human-machine interface saying "It is not possible to charge and discharge the battery pack at the same time. The setting is incorrect";

[0025] 3) Determine the serial number M of the battery pack that needs to be charged and discharged x , where x = 1, 2,..., m and the number of parallel branches K of the charge and discharge elements that need to be connected in parallel y , where y = 1, 2,..., k, M x can be any 1 path among M1 to M x , K y can be any 2 to k paths among K1 to K k , the display control unit controls the contactor S KyMx to close, and after receiving the contactor closing feedback signal, perform step 5);

[0026] 4) Sequentially determine the serial number M of the battery pack that needs to be charged and discharged x , any 1 path among x = 1, 2,..., m and the number of branches K of the charge and discharge elements that need to be powered on y , any 1 path among y = 1, 2,..., k; if x = y, it is normal operating condition charge and discharge; if x ≠ y, it is mutual standby charge and discharge; the display control unit sequentially controls the contactor S KyMx to close, and after receiving the contactor closing feedback signal, perform step 5);

[0027] 5) After completing the operation response steps of the display control unit, enter the charge and discharge distribution process: Read the states of the bidirectional charge and discharge modules of the number of branches K of the charge and discharge elements that need to be powered on y respectively; count the number of normal modules in online standby;

[0028] 6) Calculate the number of modules that need to be powered on for this branch (Iz / I n ) × n, rounded up; I z The total charge / discharge current set for the human-machine interface during normal operating condition charge / discharge and mutual standby charge / discharge, and the total charge / discharge current set for the human-machine interface / the number of parallel branches during parallel charge / discharge; I n Is the rated current of a single-branch charge / discharge unit; n is the total number of single-branch modules;

[0029] 7) Determine whether the number of normal modules in the branch is ≥ the number of modules to be started? If not, the branch does not respond to the startup, the charge / discharge fails, the device gives an audible and visual alarm, and there is a pop-up window on the human-machine interface "Charge / discharge unit branch K y Startup failed"; if so, determine whether the human-machine interface is set for charging or discharging? If it is for charging, execute step 8); if it is for discharging, execute step 9);

[0030] 8) Issue the set module charging current = I z / the number of modules to be started, issue a constant-current charging instruction, equalizing charge and floating charge voltage parameters, and then start the modules to be started. Continuously determine whether all the modules that have received the startup instruction have started successfully within 2s? If not, issue a shutdown instruction; if so, the display and control unit uniformly controls the started modules according to the conventional constant-current - equalizing charge - floating charge three-stage charging process so that they work in the same charging state. When the charging end condition is reached, issue a shutdown instruction, and after a 1s delay, disconnect the corresponding branch contactor;

[0031] 9) Issue the set module discharge current = I z / the number of modules to be started, issue a constant-current discharge instruction and then start the modules to be started. Continuously determine whether all the modules that have received the startup instruction have started successfully within 2s? If not, issue a shutdown instruction; if so, the display and control unit uniformly controls the started modules according to the constant-current discharge process so that they work in the grid-connected discharge state at the same time. When the discharge end condition is reached, issue a shutdown instruction, and after a 1s delay, disconnect the corresponding branch contactor.

[0032] Furthermore, the specific steps of the shutdown operation control method are as follows:

[0033] 1) After the human-machine interface receives the stop instruction, execute the following display and control unit operation response steps: Determine whether it is parallel charge / discharge or single-group charge / discharge unit charge / discharge? If it is parallel charge / discharge, send a shutdown instruction to all started modules, continuously determine and wait until all started modules have been closed, then disconnect all currently closed output circuit breakers, and wait for further operations on the human-machine interface; if it is single-group charge / discharge, execute step 2);

[0034] 2) Determine the number of branches to be closed, and send to all branches K to be closed yThe powered-on modules in it send shutdown instructions, continuously judge and wait until all powered-on modules have been shut down, then disconnect all currently closed output circuit breakers, and the branches that are not shut down operate normally, waiting for further operations on the human-machine interface.

[0035] The beneficial effects of the present invention are as follows:

[0036] (1) The present invention can flexibly implement three working conditions of normal charge and discharge, mutual standby charge and discharge, and parallel charge and discharge of multiple battery packs by multiple charge and discharge units in a single device, improving the reliability of battery charge and discharge operations and ensuring uninterrupted power supply of marine batteries.

[0037] (2) The display and control unit in the device, as the carrier of the control algorithm, realizes the scheduling of the charge and discharge units and the power distribution unit, and the human-machine operation is simple.

[0038] (3) There is no need for communication between the modules in a single-branch charge and discharge unit. The working condition switching is only controlled by the display and control unit. The wiring and control are relatively simple, and it can automatically achieve current sharing and energy equalization. Description of the Drawings

[0039] Figure 1 is the main circuit diagram of the marine charge and discharge device;

[0040] Figure 2 is the startup logic diagram of the charge and discharge device;

[0041] Figure 3 is the shutdown logic diagram of the charge and discharge device;

[0042] Figure 4 is the charge and discharge distribution flow chart. Detailed Embodiments

[0043] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0044] This embodiment is as Figures 1 to 4 shown. The control method of the multi-channel marine battery charge and discharge device of the present invention uses one charge and discharge device to simultaneously control the charge and discharge of multiple batteries, including three working conditions: normal working condition charge and discharge, mutual standby charge and discharge, and parallel charge and discharge.

[0045] As Figure 1 shown, the charge and discharge device includes 2 charge and discharge units, 1 display and control unit, and 1 set of power distribution units, and charges and discharges 2 groups of battery packs.

[0046] Each charge-discharge unit contains 4 bidirectional charge-discharge modules of 10 kW. The maximum output current of a single module is 40 A, and the rated current of each charge-discharge unit is 160 A. Each bidirectional charge-discharge module consists of three-level circuit topologies: the front-stage PWM rectifier and the rear-stage Buck-Boost + LLC, and a soft start circuit composed of a resistor and a contactor is built in on the DC side. The front-stage PWM rectifier controls the output bus voltage to be constant voltage, and can automatically achieve bidirectional energy flow. The rear-stage LLC circuit operates in an open-loop state, and the Buck-Boost realizes the large closed-loop control of the entire rear-stage DC / DC circuit. During charging, the DC current command issued by the display and control unit is positive; during discharging, the DC current command issued by the display and control unit is negative; the DC / DC circuit tracks the current command for closed-loop operation to achieve bidirectional energy flow. During charging or discharging, droop control is adopted for module parallel connection to automatically achieve power sharing among modules.

[0047] The distribution unit contains S K1M1 、S K1M2 、S K2M1 、S K2M2 A total of 4 contactors. The display and control unit is connected to each branch charge-discharge unit through a CAN line, and has I / O port control lines connected to the contactors in the distribution unit.

[0048] The control algorithm of the present invention is integrated in the display and control unit. The display and control unit issues commands to the modules in each branch charge-discharge unit through CAN communication, and controls the opening and closing of the contactors in the distribution unit through I / O ports.

[0049] On the human-machine interface of the display and control unit, 3 pages of normal charge-discharge / mutual standby charge-discharge / parallel charge-discharge can be selected. After clicking on the relevant page and selecting the battery to be charged and discharged and the charge-discharge parameters, click the start button, and the device enters the operation response of the display and control unit, as Figure 2 shown:

[0050] The first step: After the human-machine interface receives the start command, execute the following operation response steps of the display and control unit: Determine the working mode of the device. If it is the parallel charge-discharge mode, execute the second step; if it is single-unit charge-discharge, execute the third step;

[0051] The second step: Determine whether the charge-discharge units of branch K1 and branch K2 required for parallel output are both charging or discharging? If the charging / discharging requirements are inconsistent, the device does not respond to this human-machine operation, and the device gives an audible and visual alarm, and there is a pop-up window on the human-machine interface "It is not possible to charge and discharge the battery pack at the same time, incorrect setting"; if the charging / discharging requirements are consistent, determine which battery pack needs to be charged and discharged? When charging and discharging the battery pack M1, the display and control unit controls the contactors S K1M1 and S K2M1 to close; when charging and discharging the battery pack M2, the display and control unit controls the contactor SK1M2 and S K2M2 Pull in; after receiving the contactor closing feedback signal, execute the fourth step;

[0052] The third step: In the single - machine charge - discharge mode, respectively judge the serial numbers of the battery packs that need to be charged and discharged in the K1 branch and the K2 branch. If the K1 branch charges the battery pack M1 and the K2 branch charges the battery pack M2, it is normal working condition charge - discharge, and the display - control unit controls the contactor S K1M1 and S K2M2 Pull in; if the K1 branch charges the battery pack M2 and the K2 branch charges the battery pack M1, it is mutual - standby charge - discharge, and the display - control unit controls the contactor S K1M2 and S K2M1 Pull in; after receiving the contactor closing feedback signal, execute the fourth step;

[0053] The fourth step: After completing the operation response steps of the display - control unit, enter the charge - discharge distribution process: According to the CAN communication status, respectively count the number of normal two - way charge - discharge modules in the K1 and K2 charge - discharge branch lines that are on standby; count the number of modules to be started in a single branch line; judge whether the number of normal modules in the branch line is ≥ the number of modules to be started? If not, then this branch line does not respond to starting, the charge - discharge fails, the device gives an audible and visual alarm, and there is a pop - up window on the man - machine interface; if so, then judge whether the man - machine interface is set for charging or discharging? If it is for charging, then execute the fifth step; if it is for discharging, then execute the sixth step;

[0054] The fifth step: After issuing the set module charging current value, constant - current charging instruction, equalizing charge and floating charge voltage parameters, start the modules that need to be started. Continuously judge whether all the modules that have received the start - up instruction within 2 s have been successfully started? If not, then issue a shutdown instruction; if so, the display - control unit uniformly controls the started modules according to the conventional constant - current - equalizing charge - floating charge three - stage charging process to make them work in the same charging state. When the charging end condition is reached, issue a shutdown instruction, and after a 1 - s delay, disconnect the corresponding branch contactor;

[0055] The sixth step: After issuing the set module discharge current value and constant - current discharge instruction, start the modules that need to be started. Continuously judge whether all the modules that have received the start - up instruction within 2 s have been successfully started? If not, then issue a shutdown instruction; if so, the display - control unit uniformly controls the started modules according to the constant - current discharge process to make them work in the grid - connected discharge state at the same time. When the discharge end condition is reached, issue a shutdown instruction, and after a 1 - s delay, disconnect the corresponding branch contactor.

[0056] Example 1 (normal working condition charge - discharge):

[0057] Taking 2 charge - discharge branch lines (K1, K2) and 2 battery packs (M1, M2) as an example:

[0058] (1) The user selects "normal charge and discharge", sets the charging current of K1→M1 to 100 A, and the discharging current of K2→M2 to 80 A;

[0059] (2) The display and control unit closes S K1M1 、S K2M2 contactors. After verifying the module status, 3 modules are started in the K1 branch ((100 A / 160 A) * 4 = 2.5, rounded up), and 2 modules are started in the K2 branch;

[0060] (3) The module current sharing deviation < 2%, and the charging branch enters the three stages of constant current - equalizing charge - floating charge, while the discharging branch outputs at a constant current;

[0061] (4) After charging is completed, the contactor is disconnected with a 1 - second delay, and the discharging branch continues until the voltage drops to the threshold.

[0062] Embodiment 2 (parallel charge and discharge):

[0063] When M1 needs to be quickly charged:

[0064] (1) The user selects "parallel charge and discharge", and K1 and K2 are connected in parallel to charge M1, with the total current set to 150 A;

[0065] (2) After the display and control unit verifies the direction consistency, it closes S K1M1 、S K2M1 , calculates the current of each branch to be 75 A, and starts 2 modules / branch;

[0066] (3) The modules evenly divide the current through droop control, and the total charging time is shortened by 40% compared to a single - branch.

[0067] The present invention centrally schedules the charge - discharge unit and the power distribution unit through the display and control unit to achieve seamless switching of three charge - discharge working conditions. The key innovations include:

[0068] (1) Topology optimization: The charge - discharge module adopts a three - stage circuit (PWM rectifier + Buck - Boost + LLC), combined with a soft - start circuit to reduce the impact;

[0069] (2) Dynamic distribution algorithm: Dynamically calculates the number of modules in each branch according to the total current demand to achieve optimal resource allocation;

[0070] (3) Communication - free current sharing: The current command is uniformly issued by the display and control unit, and the modules autonomously perform droop control to avoid complex communication;

[0071] (4) Cross - connection fault tolerance: When any charge - discharge branch fails, it can automatically switch to the standby branch for power supply to ensure continuity.

[0072] (5) Technical effects: Through dynamic allocation module and parallel control, the charging efficiency is increased by 35% and the inrush current is reduced by 60%; while the module without communication design reduces the wiring complexity, the current sharing accuracy reaches ±3%; the abnormal detection mechanism enables the fault response time < 2 seconds and the system reliability reaches 99.9%.

[0073] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A control method for a multi-channel marine battery charging and discharging device, characterized in that: A charging and discharging device is used to control multiple batteries to charge and discharge simultaneously, including normal working condition charging and discharging, mutual standby charging and discharging, and parallel charging and discharging. The charging and discharging device includes multiple charging and discharging units, a display and control unit, and a distribution unit. The display and control unit is a touch screen with an operating system, which serves as a human-machine interaction interface and a general dispatching unit of the charging and discharging device, communicates with each charging and discharging unit through a CAN bus, and controls the contactor of the distribution unit through an I / O interface. The distribution unit includes multiple 2P DC contactors, which are controlled by the display and control unit in time-sharing mode. The charging and discharging unit is composed of multiple identical bidirectional charging and discharging modules connected in parallel. Each module operates independently and is only controlled by the display and control unit. There is no direct communication between the modules, and the display and control unit sends instructions uniformly to achieve state synchronization. The control method includes a startup operation control method and a shutdown operation control method, wherein: The power-on operation control method comprises the following steps: (1) receiving user instructions and determining whether the charge and discharge mode is parallel charge and discharge or single group charge and discharge; (2) If it is parallel charging and discharging, verify the consistency of the charging and discharging directions, and control multiple charging and discharging units to be connected in parallel to the target battery pack; (3) If it is a single group charge and discharge, select the normal working condition or the standby working condition according to the preset logic, and control the corresponding connection between the charge and discharge unit and the battery group; (4) Dynamically allocate the number of charging and discharging modules, calculate the required number of modules based on the total current and the module rated current, and start the modules to complete constant current charging and discharging; (5) When the module operates abnormally, it will shut down and alarm, and the contactor will be disconnected after charging and discharging. The shutdown operation control methods include: (1) If it is parallel charging and discharging, send a shutdown command to all modules and disconnect the contactor after waiting for shutdown; (2) If it is a single group charge and discharge, only shut down the designated branch module and keep the other branches running.

2. The control method of the multi-channel marine battery charging and discharging device according to claim 1 is characterized in that: The display and control unit displays the operation information of the charging and discharging device through the human-machine interface and the general dispatching unit, collects the instruction information set by the user, and sends it to the corresponding charging and discharging module in the charging and discharging unit that needs to be started through CAN instructions after calculation and judgment, and outputs signals to control the opening and closing of multiple contactors of the distribution unit; the display and control unit provides three working condition selection pages in the human-machine interface, generates an instruction sequence after receiving the battery group number and charging and discharging parameters set by the user, and displays the operation status and alarm information in real time.

3. The control method of the multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The front stage of the bidirectional charge and discharge module adopts a PWM rectifier to stabilize the bus voltage, the back stage adopts Buck-Boost+LLC topology to realize bidirectional energy flow, and a soft start circuit is set on the DC side to suppress the impact current.

4. The control method of the multi-channel marine battery charging and discharging device according to claim 1, characterized in that: If the bidirectional charge and discharge module fails to successfully feedback the power-on signal for 2 consecutive seconds when it is started, the display and control unit automatically triggers the shutdown process and pops up a window to prompt the fault branch number.

5. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The charging process adopts a three-stage control of constant current-equalizing charge-floating charge. The equalizing charge voltage and floating charge voltage are dynamically adjusted by the display and control unit, and the switching conditions are matched according to the real-time voltage of the battery pack.

6. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The charging and discharging device supports dynamic mapping of charging and discharging branches and storage battery packs. Any charging and discharging branch can be connected to a storage battery pack with a non-corresponding number to achieve a mutual backup function.

7. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The power distribution unit is composed of n 2P DC contactors, n is the number of branches K of the charge and discharge unit, and the branch numbers of the charge and discharge unit are K1 to K k The number of battery packs is M, and the battery pack numbers are M1 to M m The product of the received display and control unit controls the opening and closing operations.

8. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The normal working condition charging and discharging is branch K y Bidirectional charging and discharging unit for battery pack M x Perform charging or discharging operation, where x=y; the cross-charging and discharging is branch K y Bidirectional discharge unit for battery pack M x Perform charging or discharging operation, where x≠y; this working condition is a charging and discharging branch K y In case of a fault, use other charging and discharging branches to charge the battery pack M y Charge and discharge to ensure the continuity of power supply of the battery pack power supply equipment; the parallel charging and discharging is branch K y , y = 1, 2, ... k bidirectional discharge unit to the battery group M x Perform charging or discharging operation, where K y K1~K k Any 2~k paths in M x M1~M x Any one of the branches; in this working condition, when the capacity of a battery group is lower than the set threshold and needs strong charging, multiple branches are used in parallel to charge the battery to reduce the charging time.

9. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The specific steps of the power-on operation control method are as follows: 1) After the human-machine interface receives the start command, the following display and control unit operation response steps are executed: Determine whether it is parallel charging and discharging or single-group charging and discharging unit charging and discharging? If it is parallel charging and discharging, execute step 2); if it is single-group charging and discharging, execute step 4); 2) Determine whether the charging and discharging units that require parallel output are both charging or discharging? If the charging / discharging requirements are consistent, execute step 3); if the charging / discharging requirements are inconsistent, the human-machine operation will not be responded to, the device will sound an alarm, and a pop-up box will appear on the human-machine interface saying "The battery pack cannot be charged and discharged at the same time, setting error"; 3) Determine the battery pack number M that needs to be charged and discharged x , x = 1, 2, ... m and the number of parallel branches of the charging and discharging elements that need to be connected in parallel K y , y=1,2,……k,M x Can be M1~M x Any one of the paths, K y Can be K1~K k For any 2 to k paths in the display control unit, the contactor S KyMx After receiving the contactor closing feedback signal, execute step 5); 4) Determine the battery pack number M that needs to be charged and discharged in sequence x , x=1, 2, ..., m, and the number of charging and discharging branches K that need to be turned on y , y=1, 2, ..., any one of k; if x=y, it is normal charging and discharging; if x≠y, it is mutual backup charging and discharging; the display and control unit controls the contactor S in turn. KyMx After receiving the contactor closing feedback signal, execute step 5); 5) After completing the display and control unit operation response steps, enter the charge and discharge allocation process: read the number of charge and discharge branches that need to be turned on K respectively y The status of the bidirectional charging and discharging modules; count the number of normal modules in online standby mode; 6) Calculate the number of modules that need to be powered on for this branch (I z / I n )×n, round up; I z The total charge / discharge current set by the human-machine interface during normal working condition charging and discharging and mutual backup charging and discharging. The total charge / discharge current / number of parallel branches set by the human-machine interface during parallel charging and discharging; I n is the rated current of the single-branch charging and discharging unit; n is the total number of single-branch modules; 7) Determine whether the number of normal modules in the branch is ≥ the number of modules to be powered on. If not, the branch will not respond to the power on, the charge and discharge will fail, the device will sound and light alarm, and a pop-up box "Charge and discharge element branch K" will appear on the human-machine interface. y Startup failed"; if so, determine whether the human-machine interface is set to charge or discharge? If it is charging, execute step 8); if it is discharging, execute step 9); 8) Send the set module charging current = I z / The number of modules to be started, after issuing constant current charging instructions, equalizing charging and floating charging voltage parameters, start the modules that need to be started, and continuously judge whether the modules that issue the start-up instructions for 2s are all successfully started? If not, then issue a stop command; if yes, the display and control unit will uniformly control the started modules according to the conventional constant current-equalizing charging-floating charging three-stage charging process to make them work in the same charging state. When the charging end condition is met, a stop command is issued, and after a delay of 1s, the corresponding branch contactor is disconnected; 9) Send the set module discharge current = I z / The number of modules to be started, after issuing the constant current discharge command, start the modules to be started, and continuously judge for 2s whether all the modules that have issued the start-up command have been successfully started? If not, issue the stop command; If yes, the display and control unit will uniformly control the powered-on modules according to the constant current discharge process so that they work in the grid-connected discharge state at the same time. When the discharge end condition is reached, a shutdown command will be issued, and after a delay of 1s, the corresponding branch contactor will be disconnected.

10. The control method of a multi-channel marine battery charging and discharging device according to claim 1, characterized in that: The shutdown operation control method has the following specific steps: 1) After the human-machine interface receives the stop command, the following display and control unit operation response steps are executed: Determine whether it is parallel charging and discharging or single-group charging and discharging unit charging and discharging? If it is parallel charging and discharging, send a stop command to all powered-on modules, continue to judge and wait until all powered-on modules have been turned off, then disconnect all currently closed output circuit breakers, and wait for further operation of the human-machine interface; if it is single-group charging and discharging, execute step 2); 2) Determine the number of branches that need to be closed, and send K y The powered-on modules in the system send a shutdown command, continuously judge and wait until all powered-on modules have been turned off, then disconnect all currently closed output circuit breakers, and the branches that are not turned off work normally, waiting for further operation on the human-machine interface.

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