CN115693878B

CN115693878B - Liquid flow energy storage current transformation device and control method thereof

Info

Publication number: CN115693878B
Application number: CN202211227442.0A
Authority: CN
Inventors: 王仕城; 欧阳超; 胡磊
Original assignee: Beijing Suoying Electric Technology Co ltd
Current assignee: Beijing Suoying Electric Technology Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2024-04-16
Anticipated expiration: 2042-10-09
Also published as: CN115693878A

Abstract

The application discloses a liquid flow energy storage current transformation device and a liquid flow energy storage current transformation control method, wherein the device comprises: the system comprises an alternating current side assembly, a direct current side assembly and a master controller; the alternating-current side assembly is connected with a power grid, the alternating-current side assembly is connected with the direct-current side assembly, and the direct-current side assembly is connected with the flow battery; the alternating current side assembly comprises a first AC/DC module and a second AC/DC module; the direct current side assembly comprises a first DC/DC module and a second DC/DC module, wherein a first port of the first DC/DC module is connected in series with a second port of the first AC/DC module, and a first port of the second DC/DC module is connected in series with a second port of the second AC/DC module; the master controller is connected with the alternating current side assembly and the direct current side assembly. According to the method, the structure of the liquid flow energy storage device is simplified in a modularized structure mode, the communication time is shortened, and the response speed of the liquid flow energy storage system is improved.

Description

Liquid flow energy storage current transformation device and control method thereof

Technical Field

The application relates to the field of energy storage, in particular to a liquid flow energy storage current transformation device and a liquid flow energy storage current transformation control method.

Background

With the development of energy storage diversification, the application range of the liquid flow energy storage system is also wider and wider.

The most widely used electrochemical energy storage system battery at present is a lithium ion battery, the application amount of the energy storage converter which is matched with the battery is larger, the technology is mature, the specification of the energy storage converter related to the energy storage converter is mainly a direct-current side voltage range, and the voltage range of the flow battery is greatly different from the voltage range of the flow battery, so that the energy storage converter and the direct-current converter are generally selected to be matched with the voltage range and the application requirement of the flow battery when the flow energy storage system is designed.

The currently adopted energy storage current transformation system consists of an energy storage current transformer, a direct current transformer, a communication device and the like, and the energy storage current transformation system consists of independent equipment, so that the response speed of the system is low, and the execution efficiency of power execution is low.

Disclosure of Invention

In view of this, the present application provides a liquid flow energy storage current transformation device and a control method for liquid flow energy storage current transformation, which aim to solve the problems of low response speed and low execution power efficiency of a liquid flow energy storage system.

In order to achieve the above object, the present application provides the following technical solutions:

a first aspect of the present application provides a liquid flow energy storage deflector device, the device comprising: the system comprises an alternating current side assembly, a direct current side assembly and a master controller;

The alternating-current side assembly is connected with a power grid, the alternating-current side assembly is connected with the direct-current side assembly, and the direct-current side assembly is connected with the first flow battery and the second flow battery;

the alternating current side assembly comprises a first alternating current-to-direct current (AC/DC) module and a second AC/DC module, and a first port of the first AC/DC module is connected in parallel with a first port of the second AC/DC module;

the direct current side assembly comprises a first Direct Current (DC)/DC module and a second DC/DC module, wherein a first port of the first DC/DC module is connected in series with a second port of the first AC/DC module, and a first port of the second DC/DC module is connected in series with a second port of the second AC/DC module;

the master controller is connected with the first AC/DC module, the second AC/DC module, the first DC/DC module and the second DC/DC module;

the master controller is used for sending a starting instruction to the alternating current side component so that the first AC/DC module and the second AC/DC module operate in a direct current constant voltage mode;

and the master controller is used for sending a charging instruction to the direct-current side component so that the device enters a charging mode, the first flow battery is charged through the first DC/DC module, and the second flow battery is charged through the second DC/DC module.

Optionally, a master controller in the device is connected with the scheduling system;

the general controller is further configured to receive a power instruction of the scheduling system, so that the device enters a power mode, where the power instruction is a charging instruction or a discharging instruction, and the power mode includes a charging power mode and/or a discharging power mode.

Optionally, the overall controller is specifically configured to:

if the power instruction is a charging instruction, the master controller is further configured to collect a direct current voltage of the first DC/DC module to obtain a first voltage value;

the master controller is further used for judging whether the first voltage value is larger than a preset first threshold value or not;

if the first voltage value is greater than a preset first threshold value, the master controller is further configured to return a charge forbidden mark to a scheduling system, and send a start instruction to an AC side component, so that the first AC/DC module and the second AC/DC module operate in a direct current constant voltage mode, and the device enters the standby mode;

if the first voltage value is smaller than or equal to a preset first threshold value, the master controller is further configured to determine whether the first voltage value is greater than a preset second threshold value, where the preset second threshold value is smaller than the preset first threshold value;

If the first voltage value is greater than a preset second threshold value and is smaller than or equal to the first threshold value, the master controller is further configured to send a constant voltage charging instruction to the direct current side component, so that the first DC/DC module operates in a constant voltage mode;

if the first voltage value is smaller than or equal to a preset second threshold value, the master controller is further configured to determine whether the first voltage value is greater than or equal to a preset third threshold value, where the preset third threshold value is smaller than the preset second threshold value;

if the first voltage value is greater than or equal to a preset third threshold value and less than or equal to a preset second threshold value, the master controller is further configured to send a constant current charging instruction to the direct current side component, so that the first DC/DC module operates in a constant current mode;

if the first voltage value is smaller than a preset third threshold value, the master controller is further configured to determine whether the first voltage value is greater than a preset fourth threshold value, where the preset fourth threshold value is smaller than the preset third threshold value;

if the first voltage value is greater than or equal to a preset fourth threshold value and less than a preset third threshold value, the master controller is further configured to send the constant voltage charging instruction to the direct current side component, so that the first DC/DC module operates in the constant voltage mode;

And if the first voltage value is smaller than a preset fourth threshold value, the master controller is further configured to send a low-voltage charging instruction to the direct-current side component, so that the first DC/DC module charges the first flow battery with a preset current value.

Optionally, after the first DC/DC module operates in the constant current mode, the overall controller is further configured to:

after the first DC/DC module operates in a constant current mode for a preset period of time, the master controller is further used for collecting direct current voltage of the first DC/DC module to obtain a second voltage value;

the master controller is further configured to determine whether the second voltage value is greater than the preset second threshold;

and if the second voltage value is greater than the preset second threshold value, the master controller is further configured to send the constant voltage charging instruction to the direct current side component, so that the first DC/DC module operates in the constant voltage mode.

Optionally, the master controller is further configured to send a charging instruction to the first DC/DC module when receiving a hot standby instruction of the scheduling system, so that a loop formed by the first AC/DC module and the first DC/DC module charges the first flow battery, and send a discharging instruction to the second DC/DC module, so that a loop formed by the second AC/DC module and the second DC/DC module discharges the second flow battery.

Optionally, the first DC/DC module includes a first DC/DC sub-module and a second DC/DC sub-module;

the master controller is also used for judging the position of the fault in the device;

if the position of the fault is the first AC/DC module, the master controller is further configured to send a first shutdown instruction to the AC side component, so that a loop formed by the first AC/DC module and the first DC/DC module is disconnected;

if the position of the fault is the first DC/DC sub-module, the master controller is further configured to send a second shutdown instruction to the direct current side component, so that the first DC/DC sub-module is shutdown;

and if the position of the fault is the first DC/DC sub-module and the second DC/DC sub-module, the master controller is further used for sending a third shutdown instruction to the direct current side component so as to shutdown the first DC/DC module.

In another aspect, the present application provides a control method for flow energy storage and current transformation, which is applied to the flow energy storage and current transformation device, and the method includes:

the master controller sends a starting instruction to the alternating current side component so that the first AC/DC module and the second AC/DC module operate in a direct current constant voltage mode;

And the master controller sends a charging instruction to the direct-current side component so that the device enters a charging mode, the first flow battery is charged through the first DC/DC module, and the second flow battery is charged through the second DC/DC module.

Optionally, the method further comprises:

the master controller receives a power instruction of a dispatching system so that the device enters a power mode, wherein the power instruction is a charging instruction or a discharging instruction, and the power mode comprises a charging power mode and/or a discharging power mode.

Optionally, the method further comprises:

if the power instruction is a charging instruction, the master controller collects direct current voltage of the first DC/DC module to obtain a first voltage value;

the master controller judges whether the first voltage value is larger than a preset first threshold value or not;

if the first voltage value is greater than a preset first threshold value, the master controller returns a charge forbidden mark to the dispatching system and sends a starting instruction to an alternating current side component so that the first AC/DC module and the second AC/DC module run in a direct current constant voltage mode, and the device enters the standby mode;

if the first voltage value is smaller than or equal to a preset first threshold value, the master controller judges whether the first voltage value is larger than a preset second threshold value, wherein the preset second threshold value is smaller than the preset first threshold value;

If the first voltage value is greater than a preset second threshold value and smaller than or equal to the first threshold value, the master controller sends a constant voltage charging instruction to the direct current side component so that the first DC/DC module operates in a constant voltage mode;

if the first voltage value is smaller than or equal to a preset second threshold value, the overall controller judges whether the first voltage value is larger than or equal to a preset third threshold value, wherein the preset third threshold value is smaller than the preset second threshold value;

if the first voltage value is greater than or equal to a preset third threshold value and less than or equal to a preset second threshold value, the master controller sends a constant current charging instruction to the direct current side component so that the first DC/DC module operates in a constant current mode;

if the first voltage value is smaller than a preset third threshold value, the master controller judges whether the first voltage value is larger than a preset fourth threshold value, wherein the preset fourth threshold value is smaller than the preset third threshold value;

if the first voltage value is greater than or equal to a preset fourth threshold value and less than a preset third threshold value, the master controller sends the constant voltage charging instruction to the direct current side component so that the first DC/DC module operates in the constant voltage mode;

And if the first voltage value is smaller than a preset fourth threshold value, the master controller sends a low-voltage charging instruction to the direct-current side component so that the first DC/DC module charges the first flow battery with a preset current value.

Optionally, after the master controller sends a constant current charging instruction to the direct current side component so that the first DC/DC module operates in a constant current mode, the method further includes:

after the first DC/DC module operates in a constant current mode for a preset period of time, the master controller collects direct current voltage of the first DC/DC module to obtain a second voltage value;

the master controller judges whether the second voltage value is larger than the preset second threshold value or not;

and if the second voltage value is greater than the preset second threshold value, the master controller sends the constant voltage charging instruction to the direct current side component so that the first DC/DC module operates in the constant voltage mode.

Optionally, the method further comprises: and when the master controller receives a hot standby instruction of the dispatching system, sending a charging instruction to the first DC/DC module, so that a loop formed by the first AC/DC module and the first DC/DC module charges the first flow battery, and sending a discharging instruction to the second DC/DC module, so that a loop formed by the second AC/DC module and the second DC/DC module discharges the second flow battery.

Optionally, the method further comprises:

the master controller judges the position of the fault in the device;

if the position of the fault is the first AC/DC module, the master controller sends a first shutdown instruction to the alternating-current side component so as to disconnect a loop formed by the first AC/DC module and the first DC/DC module;

if the position of the fault is the first DC/DC sub-module, the master controller sends a second shutdown instruction to the direct-current side component so as to shutdown the first DC/DC sub-module;

and if the position of the fault is the first DC/DC sub-module and the second DC/DC sub-module, the main controller sends a third shutdown instruction to the direct current side component so as to shutdown the first DC/DC module.

The application discloses a liquid flow energy storage deflector and a control method thereof, wherein the device comprises: the system comprises an alternating current side assembly, a direct current side assembly and a master controller; the alternating-current side assembly is connected with a power grid, the alternating-current side assembly is connected with the direct-current side assembly, and the direct-current side assembly is connected with the flow battery; the alternating current side assembly comprises a first AC/DC module and a second AC/DC module, wherein a first port of the first AC/DC module is connected in parallel with a first port of the second AC/DC module; the direct current side assembly comprises a first DC/DC module and a second DC/DC module, wherein a first port of the first DC/DC module is connected in series with a second port of the first AC/DC module, and a first port of the second DC/DC module is connected in series with a second port of the second AC/DC module; the master controller is connected with the first AC/DC module, the second AC/DC module, the first DC/DC module and the second DC/DC module; and the master controller is used for sending a starting instruction to the alternating-current side component so that the first AC/DC module and the second AC/DC module operate in a direct-current constant-voltage mode, and the device enters a standby mode. According to the method, the structure of the liquid flow energy storage device is simplified in a modularized mode, the communication time is shortened, and the response speed of the system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exemplary diagram of a presently employed liquid flow energy storage system provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a liquid flow energy storage converter device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another liquid flow energy storage converter device according to an embodiment of the present disclosure;

fig. 4 is a schematic flow chart of a control method for liquid flow energy storage and conversion according to an embodiment of the present application;

FIG. 5 is a schematic flow chart of another method for controlling flow energy storage and conversion according to an embodiment of the present disclosure;

FIG. 6 is a schematic flow chart of another method for controlling flow energy storage and conversion according to an embodiment of the present disclosure;

FIG. 7 is a schematic flow chart of another method for controlling flow energy storage and conversion according to an embodiment of the present disclosure;

Fig. 8 is a schematic flow chart of another control method for flow energy storage and conversion according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

One example of a presently employed flow energy storage system is shown in fig. 1, where fig. 1 includes a power grid, an energy storage converter (Power Conversion System, PCS), a direct current converter (DC/DC), and a flow battery.

The existing liquid flow energy storage system mainly comprises a plurality of devices such as PSC, DC/DC, communication devices and the like, redundancy of materials such as device structural members, communication components, connected cable accessories, copper bars and the like inevitably occurs among the devices, and the redundancy of the devices leads to the problem of communication redundancy in the liquid flow energy storage system, so that the problem of slow overall response time and low execution efficiency of the system is solved.

Fig. 2 is a schematic diagram of a liquid flow energy storage converter device according to an embodiment of the present application, where the device includes: an AC side assembly 210, a DC side assembly 220, a general controller 230, a first AC/DC module 211, a second AC/DC module 212, a first DC/DC module 221, and a second DC/DC module 222. The ac side component 210 of the device is connected to an external power Grid (Grid), and the dc side component 220 is connected to external first and second flow batteries.

It is to be understood that the structure illustrated in the present embodiment does not constitute a specific limitation on the electronic apparatus. In other embodiments, the apparatus may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components.

The ac side assembly 210 includes: a first AC/DC module 211 and a second AC/DC module 212. The first port of the first AC/DC module 211 is connected in parallel with the first port of the second AC/DC module 212.

The dc side assembly 220 includes: a first DC/DC module 221 and a second DC/DC module 222. The first port of the first DC/DC module 221 is connected in series with the second port of the first AC/DC module 211, and the first port of the second DC/DC module 222 is connected in series with the second port of the second AC/DC module 212.

The overall controller 230 is connected to the first AC/DC module 211, the second AC/DC module 212, the first DC/DC module 221, and the second DC/DC module 222.

The overall controller 230 is configured to send a start-up instruction to the AC side component 220, so that the first AC/DC module 211 and the second AC/DC module 212 operate in a DC constant voltage mode,

and the overall controller 230 is configured to send a charging instruction to the DC side component, so that the device enters a charging mode, charges the first flow battery through the first DC/DC module 221, and charges the second flow battery through the second DC/DC module 222.

Through the device provided by the embodiment, the liquid flow energy storage system originally formed by a plurality of devices, the alternating current side component adopts a modularized AC/DC module, the direct current side component adopts a modularized DC/DC module, and the devices such as PSC, DC/DC, communication equipment and the like in the prior art are formed into an integrated independent liquid flow energy storage converter. The independent liquid flow energy storage converter reduces the material cost of equipment, simplifies the communication architecture, shortens the communication time and improves the response speed of the system.

In one possible embodiment, the overall controller 230 is coupled to a scheduling system and a flow battery management system, and the overall controller 230 is capable of receiving power commands from the scheduling system, which may be either charge power commands or discharge power commands. Upon receiving the instruction, the overall controller 230 causes the device to enter a corresponding power mode, including a charging power mode and/or a discharging power mode.

If the instruction received by the overall controller 230 is a charging power instruction, the overall controller 230 is configured to measure a direct current voltage between the first DC/DC module 221 and the flow battery, and obtain a first voltage value.

Specifically, the overall controller 230 can collect the direct current voltage between the first DC/DC module 221 and the flow battery, to obtain a first voltage value, i.e. the battery voltage. The overall controller 230 can perform a corresponding operation according to the magnitude of the first voltage value and according to a preset control logic.

Specifically, the overall controller 230 compares the first voltage value with a plurality of preset thresholds, for example, a first threshold, a second threshold, a third threshold, a fourth threshold, and the like. In this embodiment, u_max, u_health_max, u_health_min, and u_min are used for illustration. It is understood that the present application is not limited to naming a plurality of preset thresholds.

The overall controller 230 executes corresponding charging power mode control logic according to the magnitude of the first voltage value.

If the first voltage value is greater than u_max, the overall controller 230 obtains that the voltage is in the charge-disabled flag bit, and returns the charge-disabled flag to the dispatch system. At this time, the battery is charged sufficiently, and no charging is required, the overall controller 230 sends a start command to the AC side component 210, and the first AC/DC module 211 and the second AC/DC module 212 in the AC side component 210 operate in a DC constant voltage mode, so that the liquid flow energy storage converter device enters a standby mode. At this time, the liquid flow energy storage converter device can only execute the discharge power command. It will be appreciated that if the flow energy storage deflector is already in the standby mode or the hot standby mode, the overall controller 230 need not send an actuation command to the ac side component 210.

If the first voltage value is within the range of (U_health_max, U_Max), the overall controller 230 sends a constant voltage charging command to the DC side component 220 to cause the first DC/DC module 221 and the second DC/DC module 222 to operate in a constant voltage mode, wherein the constant voltage charging command includes a preset voltage value slightly greater than the first voltage value.

It is understood that the battery voltage is gradually increased during charging. Therefore, during the charging process, the overall controller 230 measures the direct current voltage between the first DC/DC module 221 and the flow battery in real time, so as to obtain a second voltage value, and if the second voltage value is greater than u_max, the overall controller 230 executes the corresponding control logic.

If the first voltage value is within the range of [ u_health_min, u_health_max ], the overall controller 230 sends a constant current charging command to the DC-side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant current mode, and the liquid flow energy storage converter enters a constant current charging mode. When the constant current charging command needs to be sent, the overall controller 230 converts the first voltage value into a current value in combination with the charging power command, and sends the current value as the constant current charging command to the direct current side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant current mode with the current value as a standard.

It can be appreciated that, during the charging process, the overall controller 230 measures the direct current voltage between the first DC/DC module 221 and the flow battery in real time to obtain a third voltage value, and when the third voltage value is greater than u_health_max, the overall controller 230 sends a constant voltage charging instruction to the direct current side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 are switched from the constant current mode to the constant voltage mode, and the flow energy storage converter enters the constant voltage charging mode.

If the first voltage value is within the range of [ u_min, u_health_min), the overall controller 230 sends a constant voltage charging command to the DC side component 220, such that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant voltage mode, such that the flow energy storage converter enters a constant voltage charging mode.

If the first voltage value is within the range of [0, u_min ]), the overall controller 230 obtains that the voltage is at the ultra-low flag, and at this time, the battery is in a low voltage state. The overall controller 230 sends a low-voltage charging instruction to the direct-current side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 charge the flow battery at a fixed current value preset in the flow battery management system, and the flow energy storage converter device enters a limited-constant current charging mode. The flow battery management system is charged by a preset fixed current value, so that the situation that the flow battery is charged under a low voltage and high intensity is avoided, and the service life of the flow battery is shortened.

It is appreciated that after a period of charging, the battery voltage of the flow battery rises, off the minimum warning line. When the overall controller 230 detects that the battery voltage is greater than u_min+x_set, the overall controller 230 obtains a voltage separation ultra-low flag bit, and the overall controller 230 sends a standby instruction to enable the liquid flow energy storage converter device to enter a standby mode, and at this time, the liquid flow energy storage converter device can only execute a charging power instruction. If the subsequent overall controller 230 receives the charging power command of the dispatching system again, the overall controller 230 executes corresponding control logic according to the voltage value.

Through the device provided by the embodiment, when the charging power instruction of the dispatching system is received, the battery voltage of the flow battery can be detected in real time by the master controller in the independent flow energy storage converter, and the flow energy storage converter can enter a corresponding working mode by combining corresponding voltage values with corresponding control logic.

Fig. 3 is a schematic diagram of another flow energy storage deflector according to an embodiment of the present application, where the flow energy storage deflector includes: an AC side assembly 210, a DC side assembly 220, a general controller 230, a first AC/DC module 211, a second AC/DC module 212, a first DC/DC module 221, and a second DC/DC module 222. The first DC/DC module 221 includes a first DC/DC sub-module 323, a second DC/DC sub-module 324, and a third DC/DC sub-module 325, and the second DC/DC module 222 includes a fourth DC/DC sub-module 326, a fifth DC/DC sub-module 327, and a sixth DC/DC sub-module 328. The ac side assembly 210 of the device is connected to an external power Grid (Grid), and the dc side assembly 220 is connected to an external flow battery. The overall controller 230 is connected to the external dispatching system, and is configured to receive an instruction sent by the external dispatching system. The overall controller 230 is connected to an external flow battery management system so that the overall controller can perform corresponding operations according to current control logic preset in the flow battery management system.

It can be appreciated that the flow energy storage converter device provided in the embodiments of the present application can include two or more AC/DC modules and two or more DC/DC modules, and in this embodiment, two AC/DC modules and two DC/DC modules are described as an example.

When the flow energy storage deflector is in a shutdown state, the overall controller 230 receives a start-up command sent by the dispatch system.

After receiving the start command, the overall controller 230 determines whether the liquid flow energy storage converter device meets the start condition, and when the liquid flow energy storage converter device meets the start condition, the overall controller 230 controls the liquid flow energy storage converter device to start.

It will be appreciated that the start-up conditions include: the liquid flow energy storage converter has no faults. The flow energy storage converter may have faults such as under-voltage faults, over-current faults, over-temperature faults, abnormal switch feedback faults, overtime faults of various actions, and the total controller 230 controls the flow energy storage converter to start only when the flow energy storage converter has no faults. The overall controller 230 can receive the information sent by the dc side component, the ac side component, and the flow battery management system, so as to determine whether the flow energy storage converter device has the fault.

After the flow energy storage inverter is activated, the overall controller 230 controls the first and second AC/DC modules 211, 212 of the AC side assembly 210 to be pre-charged. When the AC/DC module in the AC side assembly 210 meets the closing condition, the AC/DC switch in the AC/DC module is closed.

Taking the first AC/DC module 211 as an example, the overall controller 230 collects voltages of the first port and the second port of the first AC/DC module 211 and calculates a difference between the voltages of both sides. At this time, the closing conditions are: when the difference between the voltages at the two sides is smaller than the preset threshold, the AC/DC switch in the first AC/DC module 211 is closed. For example, when the difference between the voltages at two sides is smaller than 5V, the alternating current and direct current switches are closed, so that the internal circuit of the first AC/DC module is connected. By determining the closing condition, the surge current caused by the excessive pressure difference can be avoided, and the loss to the dc side module 220 can be avoided.

After the AC/DC switch in the AC/DC module is closed, the overall controller 230 detects whether the switch in the AC/DC module is completely closed, and prevents a fault caused by the non-closing of the switch.

After determining that the switch in the AC/DC module is fully closed, the overall controller 230 sends a DC constant voltage command to the AC side assembly 210 to cause the first AC/DC module 211 and the second AC/DC module 212 in the AC side assembly to operate in a DC constant voltage mode, and the liquid flow energy storage converter enters a standby mode.

It will be appreciated that the overall controller 230, upon receiving a shutdown command or detecting a fault, can send the shutdown command to the remaining components in time to cause the flow energy storage deflector to enter a shutdown state.

When the overall controller 230 receives the power command sent by the dispatch system, the flow energy storage inverter enters a power mode. If the overall controller 230 does not receive a power command, the flow energy storage inverter remains in standby mode.

If the power command received by the overall controller 230 is a discharge power command, the overall controller 230 measures the direct current voltage between the first DC/DC module 221 and the flow battery to obtain udc1.1.

Take udc1.1 as an example, as the battery voltage. The overall controller 230 can perform a corresponding operation according to the size of udc1.1, according to a preset discharge power pattern control logic.

Specifically, the overall controller 230 compares udc1.1 with a plurality of preset thresholds, for example, a first threshold, a second threshold, a third threshold, a fourth threshold, and so on. In this embodiment, u_max, u_health_max, u_health_min, and u_min are used for illustration. It is understood that the present application is not limited to naming a plurality of preset thresholds.

The overall controller 230 executes corresponding discharge power mode control logic according to the size of udc 1.1.

If Udc1.1 is greater than U_Max, then the overall controller 230 obtains that the voltage is at the charge-disabled flag bit and returns the charge-disabled flag to the dispatch system. At this time, the battery is charged sufficiently, and no charging is required, the overall controller 230 sends a start command to the AC side component 210, and the first AC/DC module 211 and the second AC/DC module 212 in the AC side component 210 operate in a DC constant voltage mode, so that the liquid flow energy storage converter device enters a standby mode. At this time, the liquid flow energy storage converter device can only execute the discharge power command.

If Udc1.1 is within the range of (U_health_min, U_Max), the overall controller 230 sends a constant current discharge instruction to the DC side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant current mode, and the liquid flow energy storage converter enters a constant current discharge mode, wherein when the constant current discharge instruction needs to be sent, the overall controller 230 converts Udc1.1 into a current value in combination with a discharge power instruction, and sends the current value as a constant current discharge instruction to the DC side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant current mode taking the current value as a standard.

It will be appreciated that the battery voltage gradually drops when discharged. Therefore, during the charging process, the overall controller 230 measures the direct current voltage between the first DC/DC module 221 and the flow battery in real time to obtain a fourth voltage value, if the fourth voltage value is smaller than u_health_min, the overall controller 230 executes corresponding control logic, and the overall controller 230 sends a constant voltage discharge instruction to the direct current side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant voltage mode, and the flow energy storage converter enters a constant voltage discharge mode. The constant voltage discharge command includes a preset voltage value, and the preset voltage value is slightly smaller than Udc1.1. For example, udc1.1 is 300V and the preset voltage value is 290V. The DC/DC module gradually reduces Udc1.1 through current regulation in the DC/DC module according to a preset voltage value in the constant voltage discharge instruction.

If udc1.1 is within the range of (u_min, u_health_min), the overall controller 230 sends a constant voltage discharge command to the DC side component 220, so that the first DC/DC module 221 and the second DC/DC module 222 operate in a constant voltage mode, and the liquid flow energy storage converter enters a constant voltage discharge mode.

During the discharging process, the overall controller 230 measures the direct current voltage between the first DC/DC module 221 and the flow battery in real time, and obtains a fifth voltage value. When the fifth voltage value is smaller than u_min, the total controller 230 obtains that the voltage is in the forbidden bit zone. At this time, the battery voltage is lower than the minimum warning line, the liquid flow energy storage converter stops discharging, enters a standby mode, and can only execute a charging power mode.

If Udc1.1 is within the range of (0, U_min.) the operations performed by the overall controller 230 are consistent with the operations performed by the overall controller 230 when the fifth voltage value described above is less than U_min, and are not described in detail herein.

In a possible embodiment, the overall controller 230 receives a hot standby instruction sent by the scheduling system, and the overall controller 230 performs a corresponding operation according to the hot standby control logic.

After receiving the hot standby command, the master controller 230 determines a hot standby condition, and when the liquid flow energy storage converter device meets the hot standby condition, the next step can be executed. The hot standby conditions include: at least two AC/DC modules and at least one DC/DC sub-module of their connected DC/DC modules are fault free. For example, the first AC/DC module 211 and the second AC/DC module 212 in the present embodiment, and the first DC/DC sub-module 323 in the first DC/DC module 221 connected in series with the first AC/DC module 211 and the fourth DC/DC sub-module 326 in the second DC/DC module 222 connected in series with the second AC/DC module 212 have no faults.

After the flow energy storage converter device meets the hot standby condition, the overall controller 230 sends a standby command to the AC side component 210, so that the first AC/DC module 211 and the second AC/DC module 212 operate in a direct current constant voltage mode, and the flow energy storage converter device enters a standby state.

After the liquid flow energy storage converter device enters a standby state, the overall controller 230 judges whether the two AC/DC modules without faults and the DC/DC submodules of the DC/DC modules connected with the two AC/DC modules meet a hot standby strategy condition, and when the hot standby strategy condition is met, the next step can be executed. The hot standby policy conditions include: one of the DC/DC sub-modules and the corresponding loop can charge the flow battery with minimum power, and the other DC/DC sub-module and the corresponding loop can discharge the flow battery with minimum power. For example, the loop formed by the first AC/DC module 211 and the first DC/DC sub-module 323 in the present embodiment can charge the flow battery with minimum power, and the loop formed by the second AC/DC module 212 and the fourth DC/DC sub-module 326 can discharge the flow battery with minimum power.

After the hot standby policy condition is satisfied, the overall controller 230 sends a charging instruction to one DC/DC sub-module in the direct current side assembly 220 and sends a discharging instruction to the other DC/DC sub-module, so that the one DC/DC sub-module and the corresponding loop charge the flow battery with the minimum power, and the other DC/DC sub-module and the corresponding loop discharge the flow battery with the minimum power. For example, in the present embodiment, the loop formed by the first AC/DC module 211 and the first DC/DC sub-module 323 charges the flow battery with minimum power, the loop formed by the second AC/DC module 212 and the fourth DC/DC sub-module 326 discharges the flow battery with minimum power, and the flow energy storage converter enters the hot standby mode.

Through the device provided by the embodiment of the application, one DC/DC sub-module loop can charge the flow battery, the other DC/DC sub-module loop discharges the flow battery, the two are operated with the minimum same power, and for an external power grid, the current is close to 0, and the total power consumption is the minimum heat loss. By executing the steps, the device is maintained in a hot standby state with minimum power consumption, and when a power instruction sent by a dispatching system is received, the device does not need to be started first and then the power instruction is executed, so that the response time of the liquid flow energy storage converter device is shortened.

In one possible embodiment, the overall controller 230 can determine where in the flow energy storage deflector a fault is located and implement a corresponding strategy.

Taking the embodiment of the apparatus shown in fig. 3 as an example, the overall controller 230 detects that the loop where the first AC/DC module 211 is located is faulty, and the overall controller 230 sends a first shutdown instruction to the AC side component 210, so that the loop where the first AC/DC module 211 is located is disconnected. At this point, the flow energy storage deflector can still operate through the loop in which the second AC/DC module 212 is located, and the flow energy storage deflector will not therefore enter a shutdown state.

The overall controller 230 detects that the second DC/DC sub-module 324 in the first DC/DC module 221 fails, and the overall controller 230 sends a second shutdown instruction to the DC-side assembly 220, so that the second DC/DC sub-module 324 is shutdown. At this point, the flow energy storage deflector can still pass through the first DC/DC module 221 and still pass through the remaining sub-modules, and the flow energy storage deflector will not therefore enter a shutdown state.

The overall controller 230 detects that the fourth DC/DC sub-module 326, the fifth DC/DC sub-module 327 and the sixth DC/DC sub-module 328 in the second DC/DC module 222 are all failed, and the overall controller 230 sends a third shutdown instruction to the DC-side component 220, so that the second DC/DC module 222 is shutdown, and a loop formed by the second DC/DC module 222 and the corresponding second AC/DC module 212 is disconnected. At this time, the flow energy storage converter can still operate through the loop in which the first AC/DC module 211 is located, and the flow energy storage converter does not enter the shutdown state.

It will be appreciated that if all AC/DC modules or DC/DC modules in the device fail, the flow energy storage deflector device enters a shutdown state.

The overall controller 203 detects that a certain part except the body of the first AC/DC module 211 fails, but in a loop corresponding to the first AC/DC module 211, the overall controller 230 sends a fourth shutdown command to the DC side component 220, so that the loop corresponding to the first AC/DC module 211 is disconnected, and the liquid flow energy storage converter device cannot enter a shutdown state.

It will be appreciated that if the failed component is a component common to all circuits, the flow energy storage deflector is brought into a shutdown condition.

According to the device provided by the embodiment, due to the adoption of the modularized design, only the corresponding loop of the corresponding AC/DC module at the alternating current side can be stopped according to faults, the other path can be normally operated, or one sub-module of the corresponding DC/DC module is stopped, and other sub-modules of the module can be normally operated. In most fault conditions, the device provided by the embodiment of the application can also normally operate.

The following describes a schematic flow chart of a control method of a liquid flow energy storage converter device according to an embodiment of the present application with reference to fig. 4, which may be implemented by the following steps S401 to S404.

S401: the master controller sends a start command to the ac side component.

Specifically, the master controller in the liquid flow energy storage converter device can receive a charging instruction from the dispatching system and send a starting instruction to the alternating current side component.

S402: the AC/DC module operates in a direct current constant voltage mode.

Specifically, after the master controller sends a starting instruction to the alternating-current side assembly, all the AC/DC modules in the alternating-current side assembly operate in a direct-current constant-voltage mode, and the liquid flow energy storage converter device enters a standby mode.

S403: the master controller sends a charging instruction to the direct current side component.

Specifically, after the liquid flow energy storage converter device enters a standby mode, the master controller sends a charging instruction to the direct-current side component.

S404: the DC/DC module charges the flow battery.

Specifically, after receiving a charging instruction sent by the master controller, the direct-current side assembly charges the flow battery through a DC/DC module in the direct-current side assembly, and the flow energy storage converter enters a charging mode.

The following describes a flow chart of a control method of a liquid flow energy storage converter device according to an embodiment of the present application with reference to fig. 5, which may be implemented by the following steps S501 to S503.

S501: the master controller sends a start command to the ac side component.

Specifically, a master controller in the liquid flow energy storage deflector can receive a start command from the scheduling system.

Specifically, after receiving a starting instruction, the master controller carries out self-detection on the liquid flow energy storage converter device, and judges whether the current liquid flow energy storage converter device meets starting conditions or not.

The starting conditions include: the liquid flow energy storage converter has no faults. The flow energy storage converter may have faults such as under-voltage faults, over-current faults, over-temperature faults, abnormal switch feedback faults, overtime faults of various actions, and the master controller will execute step S502 only when the flow energy storage converter has no faults. If the liquid flow energy storage converter device has a fault, the master controller can send fault information to the liquid flow battery management system, so that technicians can overhaul the liquid flow energy storage converter device according to the fault information in the liquid flow battery management system.

Specifically, after the AC/DC module operates in the DC constant voltage mode for a period of time, the overall controller can collect voltages of ports on both sides of the AC/DC module and calculate a difference value, and the overall controller determines whether the difference value meets a closing condition. The closing conditions are as follows: when the difference value of the voltages at the two sides is smaller than a preset threshold value. And when the difference value meets a closing condition, closing an alternating current/direct current switch in the AC/DC module. Taking the first AC/DC module as an example, the total control detects the voltages of the ports at the two sides of the first AC/DC module, calculates a difference value, wherein the difference value is 3V at the moment, meets the closing condition, and when the difference value of the voltages at the two sides is smaller than 5V, the total controller closes an AC switch and a DC switch in the first AC/DC module.

S502: the AC/DC module operates in a direct current constant voltage mode.

Specifically, after the main controller closes the alternating current and direct current switches in the first AC/DC module, whether the switches in the AC/DC module are completely closed or not is detected, and faults caused by the fact that the switches are not closed are prevented.

Specifically, after the overall controller sends a start command to the AC side component, all AC/DC modules in the AC side component operate in a DC constant voltage mode.

S503: the liquid flow energy storage converter device enters a standby state.

Specifically, after all AC/DC modules in the AC side assembly operate in a DC constant voltage mode, the flow energy storage converter device enters a standby state.

Specifically, in any step from step S501 to step S503, when the overall controller receives a shutdown instruction or detects a fault, the overall controller can send the shutdown instruction to the other components in time, so that the liquid flow energy storage converter device enters a shutdown state.

According to the method provided by the embodiment of the application, the start of the liquid flow energy storage converter device can be realized, and because the start condition and the closing condition need to be met during the start, the liquid flow energy storage converter device is prevented from being started under the condition of faults, and equipment faults caused by forced start of the liquid flow energy storage converter device are prevented. And the total control can receive a shutdown instruction at any time or detect the existence of a fault, so that the liquid flow energy storage converter enters a shutdown state and the liquid flow energy storage converter is prevented from being out of control.

The following is a schematic flow chart describing another control method of the flow energy storage converter device according to the embodiment of the present application, which may be implemented by the following steps S601 to S612.

S601: and (5) voltage judgment.

Specifically, after receiving a charging power instruction of the dispatching system, the master controller measures direct current voltage between the DC/DC module and the flow battery to obtain a voltage value of the flow battery.

Specifically, the overall controller compares the voltage value of the flow battery with a plurality of preset thresholds, for example, a first threshold, a second threshold, a third threshold, a fourth threshold, and the like. In this embodiment, u_max, u_health_max, u_health_min, and u_min are used for illustration. It is understood that the present application is not limited to naming a plurality of preset thresholds.

If the voltage value of the flow battery is greater than u_max, step S602 is performed.

If the voltage value of the flow battery is within the range of (u_health_max, u_max), step S603 is performed.

If the voltage value of the flow battery is within the range of [ U_Health_min, U_Health_max ], step S606 is performed.

If the voltage value of the flow battery is within the range of [ u_min, u_health_min), step S603 is performed.

If the voltage value of the flow battery is within the range of [0, U_min ], step S611 is performed.

S602: triggering the forbidden bit zone to the master controller.

Specifically, the master controller obtains that the voltage is in the charge-forbidden flag bit, and returns a charge-forbidden flag to the scheduling system. At the moment, the electric quantity of the battery is sufficient, charging is not needed, the master controller sends a starting instruction to the alternating current side assembly, and the AC/DC module in the alternating current side assembly operates in a direct current constant voltage mode, so that the liquid flow energy storage converter device enters a standby mode. At this time, the liquid flow energy storage converter device can only execute the discharge power command, and the control method is terminated.

It will be appreciated that if the flow energy storage deflector is already in the standby mode or the hot standby mode, the overall controller need not send an actuation command to the ac side components.

S603: the master controller transmits a constant voltage charging power command.

Specifically, the overall controller sends a constant voltage charging instruction to the direct current side component.

Specifically, the constant voltage charging command includes a preset voltage value slightly greater than the voltage value of the flow battery. For example, the voltage value of the flow battery is 300V, and the preset voltage value is 310V. The DC/DC module is used for gradually increasing the voltage value of the flow battery through current regulation in the DC/DC module according to the preset voltage value in the constant-voltage charging instruction.

S604: the DC/DC module operates in a constant voltage mode.

Specifically, the direct-current side assembly receives a constant-voltage charging instruction sent by the master controller, all DC/DC modules in the direct-current side assembly operate in a constant-voltage mode, and the liquid flow energy storage converter device enters the constant-voltage charging mode.

S605: and judging whether the voltage value of the flow battery is larger than U_Max.

Specifically, the battery voltage gradually increases during charging. After a preset period of time, for example, after 1S, it is determined whether the voltage value of the flow battery is greater than u_max, and if the voltage value of the flow battery is greater than u_max, step S601 is performed. If the voltage value of the flow battery is smaller than u_max, step S604 is performed.

S606: and the master controller sends a constant-current charging power instruction.

Specifically, the master controller sends a constant current charging instruction to the direct current side component.

Specifically, when a constant current charging instruction is required to be sent, the total controller converts a first voltage value into a current value in combination with a charging power instruction, and sends the current value as the constant current charging instruction to the direct current side component, so that the DC/DC module operates in a constant current mode taking the current value as a standard.

S607: the DC/DC module operates in a constant current mode.

Specifically, the direct-current side assembly receives a constant-current charging instruction sent by the master controller, all DC/DC modules in the direct-current side assembly operate in a constant-current mode, and the liquid flow energy storage converter device enters a constant-current charging mode.

S608: and judging whether the voltage value of the flow battery is larger than U_health_max.

Specifically, the battery voltage gradually increases during charging. After a preset period of time, for example, after 1S, it is determined whether the voltage value of the flow battery is greater than u_health_max, and if the voltage value of the flow battery is greater than u_health_max, step S605 is executed. If the voltage value of the flow battery is smaller than u_health_max, step S608 is continued.

S609: triggering the ultra-low flag bit to the master controller.

Specifically, the overall controller obtains that the voltage is in the ultra-low zone bit, and the voltage is lower than the minimum warning line, and at this time, the battery is in a low-voltage state. The master controller sends a low voltage charging command to the dc side component.

S610: the DC/DC module starts a limited-constant current mode to charge the flow battery.

Specifically, the current side component receives a low-voltage charging instruction sent by the master controller, all DC/DC modules in the direct current side component are charged by a preset fixed current value in the flow battery management system, and the flow energy storage converter enters a limited-constant current charging mode. The flow battery management system is charged by a preset fixed current value, so that the situation that the flow battery is charged under a low voltage and high intensity is avoided, and the service life of the flow battery is shortened.

S611: and judging whether the voltage value of the flow battery is larger than U_min+X_set.

Specifically, after a period of charging, the battery voltage of the flow battery rises, leaving the minimum warning line. When the total controller detects that the battery voltage is greater than U_min+X_set, the total controller obtains the voltage to be separated from the ultralow flag bit, and the total controller sends a standby instruction to enable the liquid flow energy storage converter to enter a standby mode, and at the moment, the liquid flow energy storage converter can only execute a charging power instruction.

It will be appreciated that x_set is a value preset manually to ensure that the battery voltage of the flow battery is out of the minimum guard line, and the value will be different for different flow batteries, and therefore the application is not limited to this value.

S612: and releasing the ultra-low flag bit to the master controller.

Specifically, the overall controller obtains feedback that the voltage is out of the ultra-low flag bit.

Through the method provided by the embodiment of the application, the condition that the flow energy storage converter device charges the flow battery can be met, and the method provided by the application can execute different control strategies according to the voltage value of the flow battery, and the control strategies are replaced under the condition that the voltage value of the flow battery changes, so that the battery is prevented from being damaged due to too long charging, and the service life of the flow battery is prolonged.

The following is a schematic flow chart describing another control method of the flow energy storage converter device according to the embodiment of the present application, which may be implemented by the following steps S701 to S710.

S701, judging the voltage.

If the voltage value of the flow battery is greater than u_max, step S702 is performed.

If the voltage value of the flow battery is within the range of (u_health_min, u_max), step S703 is performed.

If the voltage value of the flow battery is within the range of (U_min, U_Health_min), step S706 is performed.

If the voltage value of the flow battery is within the range of (0, U_min), step S710 is performed.

S702: triggering the forbidden bit zone to the master controller.

The master controller obtains the voltage at the charge-forbidden flag bit. At the moment, the liquid flow energy storage converter device can only execute a discharge power instruction, and the main controller sends a constant current discharge instruction to the direct current side assembly, so that all DC/DC modules in the direct current side assembly operate in a constant current mode, and the liquid flow energy storage converter device enters a constant current discharge mode.

S703: the master controller sends a constant current discharge power instruction.

Specifically, the master controller sends a constant current discharge instruction to the direct current side component.

Specifically, when a constant-current discharge instruction is required to be sent, the total controller converts the voltage value of the flow battery into a current value in combination with the discharge power instruction, and sends the current value as the constant-current discharge instruction to the direct-current side component, so that the DC/DC module operates in a constant-current mode taking the current value as a standard.

S704: the DC/DC module operates in a constant current discharge mode.

Specifically, the direct-current side assembly receives a constant-current discharge instruction sent by the master controller, all DC/DC modules in the direct-current side assembly operate in a constant-current mode, and the liquid flow energy storage converter enters a constant-current discharge mode.

S705: and judging whether the voltage value of the flow battery is smaller than U_health_min.

Specifically, the battery voltage gradually decreases during discharge. Therefore, during the charging process, the overall controller measures the DC voltage value between the DC/DC module and the flow battery in real time, and if the DC voltage value is smaller than u_health_min, step S707 is executed. If the dc voltage is greater than u_health_min, step S704 is performed.

S706: the overall controller transmits a constant voltage discharge power command.

Specifically, the overall controller sends a constant voltage discharge instruction to the direct current side component.

Specifically, the constant voltage discharge command includes a preset voltage value, which is slightly smaller than the voltage value of the flow battery. For example, the voltage value of the flow battery is 300V, and the preset voltage value is 290V. The DC/DC module is used for gradually reducing the voltage value of the flow battery through current regulation in the DC/DC module according to the preset voltage value in the constant voltage discharge instruction.

S707: the DC/DC module operates in a constant voltage discharge mode.

Specifically, the direct-current side assembly receives a constant-voltage discharge instruction sent by the master controller, all DC/DC modules in the direct-current side assembly operate in a constant-voltage mode, and the liquid flow energy storage converter device enters the constant-voltage discharge mode.

S708: and judging whether the voltage value of the flow battery is smaller than U_min.

Specifically, the battery voltage gradually decreases after a lapse of a certain period of discharge. Therefore, during the charging process, the overall controller measures the DC voltage value between the DC/DC module and the flow battery in real time, and if the DC voltage value is smaller than u_min, step S709 is executed. If the dc voltage value is greater than u_min, step S707 is performed.

S709: triggering the forbidden bit zone to the master controller.

The master controller obtains the voltage at the forbidden bit zone. At this time, the battery voltage is lower than the minimum warning line, the liquid flow energy storage converter stops discharging, enters a standby mode, only the charging power mode can be executed, and the control method is terminated.

S710: triggering the ultra-low flag bit to the master controller.

The master controller obtains that the voltage is in the ultra-low flag bit. At this time, the battery voltage is lower than the minimum warning line, the liquid flow energy storage converter stops discharging, enters a standby mode, only the charging power mode can be executed, and the control method is terminated.

According to the method provided by the embodiment of the application, the discharge of the flow battery by the flow energy storage converter device can be met, and different control strategies can be executed according to the voltage value of the flow battery, and under the condition that the voltage value of the flow battery changes, the control strategies are replaced, so that the loss of the battery caused by the fact that the voltage of the battery is too low but still in a discharge state is avoided, and the service life of the flow battery is prolonged.

The following is a schematic flow chart describing another control method of the liquid flow energy storage converter device according to the embodiment of the present application, which may be implemented by the following steps S801 to S805.

S801: a hot standby instruction is received.

Specifically, the master controller receives a hot standby instruction sent by the scheduling system.

S802: whether the hot standby condition is satisfied.

Specifically, after the main controller receives the hot standby instruction, the hot standby condition is judged, and when the liquid flow energy storage converter device accords with the hot standby condition, the next step can be executed. The hot standby conditions include: at least two AC/DC modules and the DC/DC sub-modules of their connected DC/DC modules are fault-free. If the flow energy storage converter device meets the hot standby condition, step S803 is performed. If the flow energy storage converter device does not meet the hot standby condition, the step S802 is continued.

S803: the standby mode is completed.

The same method as in steps S401 to S403 is not described here.

S804: whether the hot standby policy condition is satisfied.

Specifically, after the liquid flow energy storage converter device enters a standby state, the master controller judges whether the two AC/DC modules without faults and the DC/DC submodule of the DC/DC module connected with the two AC/DC modules meet a hot standby strategy condition, and when the hot standby strategy condition is met, the next step can be executed. The hot standby policy conditions include: one of the AC/DC modules and the corresponding loop is capable of charging the flow battery with a minimum power, and the other AC/DC module and the corresponding loop is capable of discharging the flow battery with a minimum power. The minimum power is the minimum power which can be operated by the liquid flow energy storage converter device.

S805: the overall controller charges one of the DC/DC sub-modules and the corresponding loop with minimum power operation and discharges the other loop with minimum power operation.

Specifically, after the hot standby policy condition is met, the master controller sends a charging instruction to one DC/DC sub-module in the direct-current side component and sends a discharging instruction to the other DC/DC sub-module, so that the one DC/DC sub-module and the corresponding loop charge the flow battery with the minimum power, and the other DC/DC sub-module and the corresponding loop discharge the flow battery with the minimum power. At this time, the liquid flow energy storage converter device enters a hot standby mode.

It will be appreciated that the two selected DC/DC sub-modules cannot be connected to the same AC/DC module.

By the method provided by the embodiment of the application, the power consumption is kept in the hot standby state at the minimum, when the power instruction sent by the dispatching system is received, the DC/DC module can be communicated with the AC/DC module without precharging from the shutdown state, and then the power instruction is executed, so that the response time of the liquid flow energy storage converter is shortened.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims of this application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, e.g., the division of units is merely a logical service division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each service unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software business units.

The integrated units, if implemented in the form of software business units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Those skilled in the art will appreciate that in one or more of the examples described above, the services described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the services may be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The objects, technical solutions and advantageous effects of the present invention have been described in further detail in the above embodiments, and it should be understood that the above are only embodiments of the present invention.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid flow energy storage deflector device, the device comprising: the system comprises an alternating current side assembly, a direct current side assembly and a master controller;

The master controller is used for sending a charging instruction to the direct-current side component so that the device enters a charging mode, the first flow battery is charged through the first DC/DC module, and the second flow battery is charged through the second DC/DC module;

the first DC/DC module comprises a first DC/DC sub-module and a second DC/DC sub-module;

2. The apparatus of claim 1, wherein a master controller in the apparatus is connected to a scheduling system;

3. The apparatus of claim 2, wherein the overall controller is specifically configured to:

if the first voltage value is greater than a preset first threshold value, the master controller is further configured to return a charge forbidden mark to the scheduling system, and send a start instruction to the AC side component, so that the first AC/DC module and the second AC/DC module operate in a direct current constant voltage mode, and the device enters a standby mode;

4. The apparatus of claim 3, wherein after the first DC/DC module operates in a constant current mode, the overall controller is further configured to:

5. The apparatus of claim 1, wherein the device comprises a plurality of sensors,

and the master controller is further used for sending a charging instruction to the first DC/DC module when receiving a hot standby instruction of the dispatching system, so that a loop formed by the first AC/DC module and the first DC/DC module charges the first flow battery, and sending a discharging instruction to the second DC/DC module, so that a loop formed by the second AC/DC module and the second DC/DC module discharges the second flow battery.

6. A method of controlling a flow energy storage variable flow, characterized in that the method is performed by a flow energy storage variable flow device according to any of the preceding claims 1 to 5, the method comprising:

the master controller sends a charging instruction to the direct-current side component so that the device enters a charging mode, the first flow battery is charged through a first DC/DC module, and the second flow battery is charged through a second DC/DC module;

wherein the master controller judges the position of the fault in the device;

7. The method of claim 6, wherein the method further comprises:

8. The method of claim 7, wherein the method further comprises:

if the first voltage value is greater than a preset first threshold value, the master controller returns a charge forbidden mark to the dispatching system and sends a starting instruction to an alternating current side component so that the first AC/DC module and the second AC/DC module run in a direct current constant voltage mode, and the device enters a standby mode;

9. The method of claim 8, wherein after the overall controller sends a constant current charging command to the DC side component to cause the first DC/DC module to operate in a constant current mode, the method further comprises: