CN117833324B - Energy control method and device based on energy storage converter - Google Patents

Energy control method and device based on energy storage converter Download PDF

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Publication number
CN117833324B
CN117833324B CN202410252506.5A CN202410252506A CN117833324B CN 117833324 B CN117833324 B CN 117833324B CN 202410252506 A CN202410252506 A CN 202410252506A CN 117833324 B CN117833324 B CN 117833324B
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China
Prior art keywords
energy storage
storage converter
working
grid
mode
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CN117833324A (en
Inventor
冉兆宇
冉伟康
冉琪
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Anhui Tairan Information Technology Co ltd
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Anhui Tairan Information Technology Co ltd
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to the technical field of energy storage converters, and discloses an energy control method and device based on the energy storage converters, wherein the method is applied to an energy storage system, the energy storage system comprises the energy storage converters and a plurality of battery packs, and the method comprises the following steps: collecting a current signal of an energy storage converter; determining the working mode of the energy storage converter according to an alternating current signal of an alternating current end of the energy storage converter contained in the current signal; determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter contained in the current signal; and controlling the energy flow between at least one battery pack and the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter. Therefore, the control accuracy of the energy storage converter can be improved by implementing the invention, and the energy storage converter based on accurate control is beneficial to realizing accurate control of energy flow between the energy storage battery and the power grid.

Description

Energy control method and device based on energy storage converter
Technical Field
The invention relates to the technical field of energy storage converters, in particular to an energy control method and device based on an energy storage converter.
Background
Energy storage systems are an important component in the power generation process. In practical application, the energy storage system can store redundant electric energy in the energy storage battery when the load of the power grid is low, and release the electric energy to the power grid when the load is in a peak power consumption state so as to adjust the load demand. In practical applications, the energy storage system often performs flow control on energy between the energy storage battery and the power grid through an energy storage converter built in the energy storage system.
However, the existing control mode of the energy storage converter is based on the working mode of the energy storage converter, and the control mode is single, so that the accurate control of energy flow between the energy storage battery and the power grid cannot be realized through the control of the energy storage converter. It is important to provide a technical scheme for improving the accuracy of energy control based on the energy storage converter.
Disclosure of Invention
The invention provides an energy control method and device based on an energy storage converter, which can improve the control accuracy of the energy storage converter and is beneficial to realizing the accurate control of energy flow between an energy storage battery and a power grid based on the energy storage converter with accurate control.
In order to solve the technical problem, a first aspect of the present invention discloses an energy control method based on an energy storage converter, the method is applied to an energy storage system, the energy storage system includes the energy storage converter and a plurality of battery packs, the method includes:
Collecting a current signal of the energy storage converter, wherein the current signal of the energy storage converter comprises an alternating current signal of an alternating current end of the energy storage converter and a direct current signal of a direct current end of the energy storage converter, the alternating current end of the energy storage converter is connected with an alternating current bus of the energy storage system in parallel, the alternating current end of the energy storage converter is connected with a power grid through the alternating current bus, the direct current end of the energy storage converter is connected with a direct current bus of the energy storage system in parallel, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the direct current bus;
determining a working mode of the energy storage converter according to an alternating current signal of an alternating current end of the energy storage converter, wherein the working mode comprises a grid-connected mode or an off-grid mode;
determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter;
And controlling the energy flow between at least one battery pack and the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter.
In an optional implementation manner, in a first aspect of the present invention, the determining, according to the operation mode of the energy storage converter and the dc signal of the dc end of the energy storage converter, an operation flow corresponding to the operation mode of the energy storage converter includes:
Determining a first working parameter of a direct current end of the energy storage converter according to a direct current signal of the direct current end of the energy storage converter;
determining a second working parameter of an alternating current end of the energy storage converter according to the working mode of the energy storage converter, wherein a working flow corresponding to the working mode of the energy storage converter comprises the first working parameter of a direct current end of the energy storage converter and the second working parameter of the alternating current end of the energy storage converter;
Wherein, according to the working mode of the energy storage converter, determining the second working parameter of the ac end of the energy storage converter includes:
When the working mode of the energy storage converter is the off-grid mode, determining off-grid working parameters of an alternating-current end of the energy storage converter and determining mode switching conditions of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, wherein the mode switching conditions are used for indicating conditions corresponding to the switching of the working mode of the energy storage converter from the off-grid mode to the grid-connected mode; or alternatively
When the working mode of the energy storage converter is the grid-connected mode, determining grid-connected working parameters of an alternating current end of the energy storage converter according to alternating current signals of the alternating current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter, wherein the control strategy set comprises one or more combinations of a constant current strategy, a constant power strategy and a constant voltage strategy;
The second working parameters of the alternating current end of the energy storage converter comprise off-grid working parameters of the alternating current end of the energy storage converter and mode switching conditions of the energy storage converter in the off-grid mode, or grid-connected working parameters of the alternating current end of the energy storage converter and target control strategies corresponding to the grid-connected working parameters in the grid-connected mode.
In a first aspect of the present invention, the communication end of the energy storage converter and the communication ends of all the battery packs are connected to the communication end of an upper computer of the energy storage system, and the upper computer is provided with a monitoring system, and the monitoring system is used for monitoring the energy storage converter and/or all the battery packs;
And controlling, by the energy storage converter, energy flow between at least one battery pack and the power grid according to a workflow corresponding to a working mode of the energy storage converter, including:
Monitoring the charge state of each battery pack through the monitoring system;
Selecting a target battery set from all the battery packs according to the charge states of all the battery packs, wherein the target battery set comprises at least one target battery pack with the charge states meeting a preset state;
And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein all target battery sets included in the target battery set are battery sets needing to be charged or battery sets needing to be discharged.
As an optional implementation manner, in the first aspect of the present invention, the selecting, according to the states of charge of all the battery packs, the target battery pack set from all the battery packs includes:
Classifying all the battery packs according to the charge states of all the battery packs to obtain a classification result, wherein the classification result comprises a first type battery pack set and a second type battery pack set, the first type battery pack set is empty or all battery packs contained in the first type battery pack set are charging battery packs with charging requirements, the second type battery pack set is empty or all battery packs contained in the second type battery pack set are discharging battery packs with discharging requirements, and the first type battery pack set and the second type battery pack set are not empty at the same time;
And selecting a target battery set from the first battery set and the second battery set, wherein the target battery set comprises the first battery set and/or the second battery set.
As an optional implementation manner, in the first aspect of the present invention, the controlling, by the energy storage converter, the energy flow between the target battery set and the power grid according to the workflow corresponding to the operation mode of the energy storage converter includes:
When all the target battery packs contained in the target battery pack set are battery packs needing to be charged, controlling the power grid to charge the target battery pack set through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter; or alternatively
When all the target battery packs contained in the target battery pack set are battery packs needing to be discharged, controlling the target battery pack set to discharge the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter;
wherein the energy flow between the target battery set and the grid comprises the grid charging the target battery set or the target battery set discharging the grid.
In a first aspect of the present invention, the determining the working mode of the energy storage converter according to the ac signal of the ac end of the energy storage converter includes:
analyzing the working environment of the energy storage system where the energy storage converter is located according to an alternating current signal of an alternating current end of the energy storage converter;
And determining the working mode of the energy storage converter according to the working environment of the energy storage system where the energy storage converter is located.
In an optional implementation manner, in a first aspect of the present invention, the determining, according to an operating environment of the energy storage system where the energy storage converter is located, an operating mode of the energy storage converter includes:
judging whether the current condition of the energy storage system where the energy storage converter is located meets a preset working environment judgment condition according to the working environment of the energy storage system where the energy storage converter is located, wherein the working environment judgment condition comprises a judgment condition of the connection relation between the energy storage system where the energy storage converter is located and the power grid;
when the current condition of the energy storage system meets the working environment judging condition, determining the working mode of the energy storage converter as a grid-connected mode;
and when the current condition of the energy storage system is judged to not meet the working environment judgment condition, determining the working mode of the energy storage converter as an off-grid mode.
The invention discloses an energy control device based on an energy storage converter, which is applied to an energy storage system, wherein the energy storage system comprises the energy storage converter and a plurality of battery packs, and the device comprises an acquisition module, a determination module and a control module, wherein:
The acquisition module is used for acquiring current signals of the energy storage converter, wherein the current signals of the energy storage converter comprise alternating current signals of an alternating current end of the energy storage converter and direct current signals of a direct current end of the energy storage converter, the alternating current end of the energy storage converter is connected with an alternating current bus of the energy storage system in parallel, the alternating current end of the energy storage converter is connected with a power grid through the alternating current bus, the direct current end of the energy storage converter is connected with a direct current bus of the energy storage system in parallel, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the direct current bus;
The determining module is used for determining the working mode of the energy storage converter according to the alternating current signal of the alternating current end of the energy storage converter, wherein the working mode comprises a grid-connected mode or an off-grid mode;
The determining module is further configured to determine a workflow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter;
The control module is used for controlling energy flow between at least one battery pack and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter.
In a second aspect of the present invention, the determining module determines, according to the operation mode of the energy storage converter and the dc signal of the dc end of the energy storage converter, an operation procedure corresponding to the operation mode of the energy storage converter specifically includes:
Determining a first working parameter of a direct current end of the energy storage converter according to a direct current signal of the direct current end of the energy storage converter;
determining a second working parameter of an alternating current end of the energy storage converter according to the working mode of the energy storage converter, wherein a working flow corresponding to the working mode of the energy storage converter comprises the first working parameter of a direct current end of the energy storage converter and the second working parameter of the alternating current end of the energy storage converter;
the determining module determines, according to the working mode of the energy storage converter, a second working parameter of an ac end of the energy storage converter in a manner specifically including:
When the working mode of the energy storage converter is the off-grid mode, determining off-grid working parameters of an alternating-current end of the energy storage converter and determining mode switching conditions of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, wherein the mode switching conditions are used for indicating conditions corresponding to the switching of the working mode of the energy storage converter from the off-grid mode to the grid-connected mode; or alternatively
When the working mode of the energy storage converter is the grid-connected mode, determining grid-connected working parameters of an alternating current end of the energy storage converter according to alternating current signals of the alternating current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter, wherein the control strategy set comprises one or more combinations of a constant current strategy, a constant power strategy and a constant voltage strategy;
The second working parameters of the alternating current end of the energy storage converter comprise off-grid working parameters of the alternating current end of the energy storage converter and mode switching conditions of the energy storage converter in the off-grid mode, or grid-connected working parameters of the alternating current end of the energy storage converter and target control strategies corresponding to the grid-connected working parameters in the grid-connected mode.
In a second aspect of the present invention, the communication end of the energy storage converter and the communication ends of all the battery packs are connected to the communication end of an upper computer of the energy storage system, and the upper computer is provided with a monitoring system, and the monitoring system is used for monitoring the energy storage converter and/or all the battery packs;
and the control module controls the energy flow between at least one battery pack and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein the method specifically comprises the following steps of:
Monitoring the charge state of each battery pack through the monitoring system;
Selecting a target battery set from all the battery packs according to the charge states of all the battery packs, wherein the target battery set comprises at least one target battery pack with the charge states meeting a preset state;
And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein all target battery sets included in the target battery set are battery sets needing to be charged or battery sets needing to be discharged.
As an optional implementation manner, in the second aspect of the present invention, the manner in which the control module selects the target battery set from all the battery packs according to the states of charge of all the battery packs specifically includes:
Classifying all the battery packs according to the charge states of all the battery packs to obtain a classification result, wherein the classification result comprises a first type battery pack set and a second type battery pack set, the first type battery pack set is empty or all battery packs contained in the first type battery pack set are charging battery packs with charging requirements, the second type battery pack set is empty or all battery packs contained in the second type battery pack set are discharging battery packs with discharging requirements, and the first type battery pack set and the second type battery pack set are not empty at the same time;
And selecting a target battery set from the first battery set and the second battery set, wherein the target battery set comprises the first battery set and/or the second battery set.
As an optional implementation manner, in a second aspect of the present invention, the manner in which the control module controls, according to a workflow corresponding to a working mode of the energy storage converter, energy flow between the target battery set and the power grid through the energy storage converter specifically includes:
When all the target battery packs contained in the target battery pack set are battery packs needing to be charged, controlling the power grid to charge the target battery pack set through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter; or alternatively
When all the target battery packs contained in the target battery pack set are battery packs needing to be discharged, controlling the target battery pack set to discharge the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter;
wherein the energy flow between the target battery set and the grid comprises the grid charging the target battery set or the target battery set discharging the grid.
In a second aspect of the present invention, the determining module determines, according to an ac signal of an ac terminal of the energy storage converter, a mode of operation of the energy storage converter specifically includes:
analyzing the working environment of the energy storage system where the energy storage converter is located according to an alternating current signal of an alternating current end of the energy storage converter;
And determining the working mode of the energy storage converter according to the working environment of the energy storage system where the energy storage converter is located.
In a second aspect of the present invention, the determining module determines, according to an operating environment of the energy storage system in which the energy storage converter is located, an operating mode of the energy storage converter specifically includes:
judging whether the current condition of the energy storage system where the energy storage converter is located meets a preset working environment judgment condition according to the working environment of the energy storage system where the energy storage converter is located, wherein the working environment judgment condition comprises a judgment condition of the connection relation between the energy storage system where the energy storage converter is located and the power grid;
when the current condition of the energy storage system meets the working environment judging condition, determining the working mode of the energy storage converter as a grid-connected mode;
and when the current condition of the energy storage system is judged to not meet the working environment judgment condition, determining the working mode of the energy storage converter as an off-grid mode.
In a third aspect, the present invention discloses another energy control device based on an energy storage converter, the device comprising:
A memory storing executable program code;
A processor coupled to the memory;
The processor invokes the executable program code stored in the memory to execute the energy control method based on the energy storage converter disclosed in the first aspect of the invention.
A fourth aspect of the invention discloses a computer storage medium storing computer instructions for performing the energy storage converter based energy control method disclosed in the first aspect of the invention when called.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
In the embodiment of the invention, a current signal of an energy storage converter is acquired, the current signal of the energy storage converter comprises an alternating current signal of an alternating current end of the energy storage converter and a direct current signal of a direct current end of the energy storage converter, the alternating current end of the energy storage converter is connected in parallel to an AC bus of an energy storage system, the alternating current end of the energy storage converter is connected with a power grid through the AC bus, the direct current end of the energy storage converter is connected in parallel to a DC bus of the energy storage system, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the DC bus; determining the working mode of the energy storage converter according to an alternating current signal of an alternating current end of the energy storage converter, wherein the working mode comprises a grid-connected mode or an off-grid mode; determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter; and controlling the energy flow between at least one battery pack and the power grid according to the working flow corresponding to the working mode of the energy storage converter. Therefore, the working mode of the energy storage converter can be determined through the alternating current signal of the alternating current end of the energy storage converter, the accuracy of determining the working mode of the energy storage converter can be improved, the working flow corresponding to the working mode of the energy storage converter is determined through the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter, the accuracy of determining the working flow corresponding to the working mode of the energy storage converter can be improved, the control of the energy storage converter can be realized according to the working flow corresponding to the working mode of the energy storage converter, the accuracy of controlling the energy storage converter can be improved, the energy flow between the energy storage battery and the power grid can be controlled through the energy storage converter, the accurate control of the energy flow between the energy storage battery and the power grid can be realized based on the accurate control of the energy storage converter, the control efficiency of the energy flow can be improved, the energy resource between the energy storage battery and the power grid can be fully utilized, and the intelligent transfer of the energy between the energy storage battery and the power grid can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an energy control method based on an energy storage converter according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another energy control method based on an energy storage converter according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an energy control device based on an energy storage converter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another energy control device based on an energy storage converter according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses an energy control method and device based on an energy storage converter, which can determine the working mode of the energy storage converter through an alternating current signal of an alternating current end of the energy storage converter, can improve the determination accuracy of the working mode of the energy storage converter, then determine the working flow corresponding to the working mode of the energy storage converter through the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter, can improve the determination accuracy of the working flow corresponding to the working mode of the energy storage converter, can realize the control of the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, can improve the control accuracy of the energy storage converter, and can control the energy flow between an energy storage battery and a power grid through the energy storage converter, thereby being beneficial to improving the control efficiency of the energy flow and being beneficial to fully utilizing the energy resource between the energy storage battery and the power grid and realizing the intelligent transfer of the energy between the energy storage battery and the power grid. The following will describe in detail.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of an energy control method based on an energy storage converter according to an embodiment of the invention. The energy control method based on the energy storage converter described in fig. 1 may be applied to an energy storage system, where the energy storage system may be used to implement flow control of energy between an energy storage battery and a power grid, where the energy storage system may include the energy storage converter and a plurality of battery packs, and embodiments of the present invention are not limited. As shown in fig. 1, the energy control method based on the energy storage converter may include the following operations:
101. And collecting a current signal of the energy storage converter.
In the embodiment of the invention, the current signal of the energy storage converter may include an ac signal of an ac end of the energy storage converter and a dc signal of a dc end of the energy storage converter. Specifically, the connection relationship between the energy storage converter and the corresponding device may specifically include: the alternating current end of the energy storage converter is connected in parallel with an AC bus of the energy storage system, the alternating current end of the energy storage converter is connected with a power grid through the AC bus, the direct current end of the energy storage converter is connected in parallel with a DC bus of the energy storage system, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the DC bus. For example, the energy storage converter may be a 250kW off-grid energy storage converter, the AC bus of the energy storage system may be a 380V AC bus, and the DC bus of the energy storage system may be a 750V DC bus.
102. And determining the working mode of the energy storage converter according to the alternating current signal of the alternating current end of the energy storage converter.
In the embodiment of the invention, the working mode can comprise a grid-connected mode or a grid-off mode.
103. And determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter.
In an embodiment of the present invention, the working procedure corresponding to the working mode of the energy storage converter may include a first working parameter of the dc end of the energy storage converter and a second working parameter of the ac end of the energy storage converter. Optionally, a mapping relationship exists between the working mode of the energy storage converter and the second working parameter of the ac end of the energy storage converter. Specifically, when the working mode of the energy storage converter is a grid-connected mode, the second working parameter of the alternating-current end of the energy storage converter is the second working parameter obtained in the grid-connected mode; when the working mode of the energy storage converter is the off-grid mode, the second working parameter of the alternating-current end of the energy storage converter is the second working parameter obtained in the off-grid mode.
104. And controlling the energy flow between at least one battery pack and the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter.
In the embodiment of the present invention, optionally, the energy flow between each battery pack and the power grid may include each battery pack discharging the power grid or each battery pack charging through the power grid, which is not limited in the embodiment of the present invention.
Therefore, the energy control method based on the energy storage converter described in fig. 1 can determine the working mode of the energy storage converter through the alternating current signal of the alternating current end of the energy storage converter, so that the accuracy of determining the working mode of the energy storage converter can be improved, then the working flow corresponding to the working mode of the energy storage converter is determined through the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter, the accuracy of determining the working flow corresponding to the working mode of the energy storage converter can be improved, the control accuracy of the energy storage converter can be improved, the energy flow between the energy storage battery and the power grid can be controlled through the energy storage converter, the accurate control of the energy flow between the energy storage battery and the power grid can be realized based on the accurately controlled energy storage converter, the control efficiency of the energy flow can be improved, the energy resource between the energy storage battery and the power grid can be fully utilized, and the intelligent transfer of the energy between the energy storage battery and the power grid can be realized.
In an optional embodiment, the determining the workflow corresponding to the operation mode of the energy storage converter according to the operation mode of the energy storage converter and the dc signal of the dc end of the energy storage converter in step 103 may include:
Determining a first working parameter of the direct current end of the energy storage converter according to the direct current signal of the direct current end of the energy storage converter;
And determining a second working parameter of the alternating-current end of the energy storage converter according to the working mode of the energy storage converter.
In the embodiment of the invention, the second working parameters of the ac end of the energy storage converter may include an off-grid working parameter of the ac end of the energy storage converter and a mode switching condition of the energy storage converter in an off-grid mode, or a grid-connected working parameter of the ac end of the energy storage converter and a target control strategy corresponding to the grid-connected working parameter in a grid-connected mode.
In an embodiment of the present invention, optionally, the first operating parameter of the dc end of the energy storage converter may include one or more of a rated active power (e.g., 250 kW) of the dc end of the energy storage converter, a dc voltage operating range (e.g., 500-800V) of the dc end of the energy storage converter, a maximum dc input voltage (e.g., 850V) of the dc end of the energy storage converter, a maximum dc input current (e.g., 525A) of the dc end of the energy storage converter, a constant current charging/discharging current range (e.g., 0-525A) of the dc end of the energy storage converter, a constant power charging/discharging power range (e.g., 0-250 kW) of the dc end of the energy storage converter, a dc ripple of the dc end of the energy storage converter, a dc current precision (e.g., less than 0.5%) of the dc end of the energy storage converter, and a dc voltage precision (e.g., less than 1%) of the dc end of the energy storage converter.
Therefore, the first working parameter of the direct current end of the energy storage converter can be determined through the direct current signal of the direct current end of the energy storage converter, the determination accuracy of the first working parameter of the direct current end of the energy storage converter can be improved, the second working parameter of the alternating current end of the energy storage converter can be determined through the working mode of the energy storage converter, the determination accuracy of the second working parameter of the alternating current end of the energy storage converter can be improved, the working flow corresponding to the working mode of the energy storage converter can be accurately determined, and accordingly the follow-up control accuracy of the energy storage converter can be improved based on the determined working flow corresponding to the working mode of the accurate energy storage converter.
In this optional embodiment, as an optional implementation manner, determining the second operating parameter of the ac end of the energy storage converter according to the operating mode of the energy storage converter may include:
when the working mode of the energy storage converter is off-grid mode, according to the alternating current signal of the alternating current end of the energy storage converter, determining off-grid working parameters of the alternating current end of the energy storage converter and determining mode switching conditions of the energy storage converter.
In the embodiment of the invention, the mode switching condition is used for indicating the condition corresponding to the switching of the working mode of the energy storage converter from the off-grid mode to the grid-connected mode. Optionally, the off-grid working parameters of the ac end of the energy storage converter may include one or more combinations of rated ac power (e.g., 250 kW) of the ac end of the energy storage converter, maximum ac power (e.g., 275 kW) of the ac end of the energy storage converter, ac output voltage (e.g., 304-458 v) of the ac end of the energy storage converter, ac end frequency (e.g., 50/60hz±2 Hz) of the ac end of the energy storage converter, power factor adjustment range (e.g., -1) of the ac end of the energy storage converter, current distortion rate of the ac end of the energy storage converter, and output efficiency of the ac end of the energy storage converter, which is not limited by the embodiments of the present invention.
Therefore, when the working mode of the energy storage converter is the off-grid mode, the implementation of the alternative implementation mode can accurately determine the off-grid working parameter of the alternating-current end of the energy storage converter and determine the mode switching condition of the energy storage converter through the alternating-current signal of the alternating-current end of the energy storage converter.
In this optional embodiment, as another optional implementation manner, determining the second operating parameter of the ac end of the energy storage converter according to the operating mode of the energy storage converter may include:
When the working mode of the energy storage converter is a grid-connected mode, determining grid-connected working parameters of the alternating-current end of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter.
In the embodiment of the invention, the control strategy set can comprise one or more of a constant current strategy, a constant power strategy and a constant voltage strategy. Optionally, the grid-connected operation parameters of the ac end of the energy storage converter may include one or more of an output voltage precision of the ac end of the energy storage converter (e.g., less than 1%, and the output voltage precision may be obtained according to a rated working condition), an output voltage range of the ac end of the energy storage converter (e.g., 198-242 v), an output frequency range of the ac end of the energy storage converter (e.g., 49.5-50.5 hz), an output voltage THD value of the ac end of the energy storage converter (e.g., THD value may be used to represent a total harmonic distortion rate), an output voltage imbalance of the ac end of the energy storage converter, a dynamic time-voltage amplitude abrupt change range of the ac end of the energy storage converter, and a dynamic time-voltage amplitude recovery time (e.g., 20 ms) of the ac end of the energy storage converter.
Therefore, in the optional implementation manner, under the condition that the working mode of the energy storage converter is the grid-connected mode, the grid-connected working parameters of the alternating-current end of the energy storage converter and the target control strategies corresponding to the grid-connected working parameters are accurately determined through the alternating-current signals of the alternating-current end of the energy storage converter, and the selection diversity and the flexibility of the determination modes of the working flow corresponding to the working mode of the energy storage converter are improved based on the diversified working modes of the energy storage converter.
Example two
Referring to fig. 2, fig. 2 is a schematic flow chart of an energy control method based on an energy storage converter according to an embodiment of the invention. The energy control method based on the energy storage converter described in fig. 2 may be applied to an energy storage system, where the energy storage system may be used to implement flow control of energy between an energy storage battery and a power grid, where the energy storage system may include the energy storage converter and a plurality of battery packs, and embodiments of the present invention are not limited. As shown in fig. 2, the energy control method based on the energy storage converter may include the following operations:
201. And collecting a current signal of the energy storage converter.
202. And determining the working mode of the energy storage converter according to the alternating current signal of the alternating current end of the energy storage converter.
203. And determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter.
In the embodiment of the invention, the communication end of the energy storage converter and the communication ends of all the battery packs are connected with the communication end of the upper computer of the energy storage system. The upper computer is provided with a monitoring system, wherein the monitoring system is used for monitoring the energy storage converter and/or all battery packs.
204. The state of charge of each battery is monitored by a monitoring system.
In the embodiment of the present invention, step 204 and step 201-step 203 are not separated in sequence, that is, step 204 may occur before step 201-step 203, may occur after step 201-step 20, or may occur simultaneously with any step 201-step 203, which is not limited in the embodiment of the present invention.
205. A target set of battery packs is selected from among all battery packs based on the states of charge of all battery packs.
In an embodiment of the present invention, the target battery set includes at least one target battery set having a state of charge satisfying a preset state.
206. And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter.
In the embodiment of the invention, all the target battery packs included in the target battery pack set are battery packs needing to be charged or battery packs needing to be discharged. Specifically, the energy flow between the target battery set and the power grid includes the power grid charging the target battery set or the target battery set discharging the power grid.
In the embodiment of the present invention, for other descriptions of step 201 to step 206, please refer to the detailed descriptions of step 101 to step 104 in the first embodiment, and the description of the embodiment of the present invention is omitted.
Therefore, the implementation of the energy control method based on the energy storage converter described in fig. 2 can determine the working mode of the energy storage converter through the alternating current signal of the alternating current end of the energy storage converter, so that the accuracy of determining the working mode of the energy storage converter can be improved, then the working flow corresponding to the working mode of the energy storage converter is determined through the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter, the accuracy of determining the working flow corresponding to the working mode of the energy storage converter can be improved, the control accuracy of the energy storage converter can be improved, the energy flow between the energy storage battery and the power grid can be controlled through the energy storage converter, the accurate control of the energy flow between the energy storage battery and the power grid can be realized based on the accurately controlled energy storage converter, the control efficiency of the energy flow can be improved, the energy resource between the energy storage battery and the power grid can be fully utilized, and the intelligent transfer of the energy between the energy storage battery and the power grid can be realized. In addition, the state of charge of each energy storage battery pack can be monitored through the monitoring system, then the target battery pack set is selected through the states of charge of all the energy storage battery packs, accurate selection of the target battery pack set can be achieved, and then energy flow between the target battery pack set and a power grid, which are accurately selected, is controlled through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, so that the control accuracy of the energy flow between the target battery pack set and the power grid can be improved to a certain extent, the occurrence of energy transfer of the target battery pack set which does not need energy transfer is reduced, and the energy transfer accuracy between the target battery pack set and the power grid is also facilitated.
In an alternative embodiment, the selecting the target battery set from all battery sets according to the states of charge of all battery sets in step 205 may include:
classifying all the battery packs according to the charge states of all the battery packs to obtain classification results;
And selecting a target battery set from the first battery set included in the classification result and the second battery set included in the classification result.
In the embodiment of the invention, the classification result may include a first type of battery set and a second type of battery set. The first type battery set is empty or all battery packs contained in the first type battery set are charged battery packs with charging requirements, and the second type battery set is empty or all battery packs contained in the second type battery set are discharged battery packs with discharging requirements. Wherein the first type of battery set is empty when the second type of battery set is different from the first type of battery set.
In an embodiment of the present invention, the target battery set includes a first type battery set and/or a second type battery set. Specifically, when the target battery set includes the first type battery set, it indicates that all battery packs included in the target battery set need to be charged, and when the target battery set includes the second type battery set, it indicates that all battery packs included in the target battery set need to be discharged.
Therefore, according to the alternative embodiment, all the battery packs can be classified according to the charge states of all the battery packs, so that classification results (the classification results can comprise a first type battery pack set and a second type battery pack set) can be obtained, the accuracy and the reliability of classifying all the battery packs can be improved, then the target battery pack set is selected from the first type battery pack set and the second type battery pack set, the accurate selection of the target battery pack set can be realized, and the improvement of the control accuracy of energy flow between the target battery pack set and a power grid in subsequent control is facilitated based on the accurately selected target battery pack set.
In another optional embodiment, the controlling, by the energy storage converter, the energy flow between the target battery set and the power grid according to the workflow corresponding to the operation mode of the energy storage converter in step 206 may include:
When all the target battery packs contained in the target battery pack set are battery packs needing to be charged, controlling a power grid to charge the target battery pack set through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter; or alternatively
When all the target battery packs contained in the target battery pack set are battery packs needing to be discharged, the target battery pack set is controlled by the energy storage converter to discharge the power grid according to the working flow corresponding to the working mode of the energy storage converter.
Therefore, in the optional embodiment, under the condition that the target battery set needs to be charged, the power grid is controlled to charge the target battery set through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, so that the control accuracy of the power grid to charge the target battery set can be improved; and under the condition that the target battery set needs to be discharged, the target battery set is controlled to discharge the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, so that the accuracy of controlling the target battery set to discharge the power grid can be improved, and the diversity and the flexibility of the control modes of charging and discharging between the target battery set and the power grid can be improved based on the diversity of the target battery set.
In yet another alternative embodiment, determining the operation mode of the energy storage converter according to the ac signal of the ac end of the energy storage converter in step 202 may include:
Analyzing the working environment of an energy storage system in which the energy storage converter is positioned according to an alternating current signal of an alternating current end of the energy storage converter;
and determining the working mode of the energy storage converter according to the working environment of the energy storage system in which the energy storage converter is positioned.
In the embodiment of the invention, the working environment of the energy storage system can comprise the working condition environment between the energy storage system and the power grid.
Therefore, according to the alternative embodiment, the working environment of the energy storage system where the energy storage converter is located can be analyzed through the alternating current signal of the alternating current end of the energy storage converter, the analysis accuracy of the working environment of the energy storage system can be improved, then the working mode of the energy storage converter is determined according to the working environment of the energy storage system where the energy storage converter is located, and the determination accuracy and reliability of the working mode of the energy storage converter can be improved based on the accurately analyzed working environment.
In this optional embodiment, as an optional implementation manner, determining the working mode of the energy storage converter according to the working environment of the energy storage system where the energy storage converter is located includes:
judging whether the current condition of the energy storage system where the energy storage converter is located meets the preset working environment judging condition according to the working environment of the energy storage system where the energy storage converter is located;
when the current condition of the energy storage system meets the working environment judgment condition, determining the working mode of the energy storage converter as a grid-connected mode;
And when the current condition of the energy storage system is judged to not meet the working environment judgment condition, determining the working mode of the energy storage converter as an off-grid mode.
In the embodiment of the invention, the working environment judgment conditions comprise judgment conditions of the connection relation between the energy storage system where the energy storage converter is positioned and the power grid. Specifically, according to the working environment of the energy storage system where the energy storage converter is located, determining whether the current condition of the energy storage system where the energy storage converter is located meets the preset working environment determination condition may include: judging whether the working environment of the energy storage system where the energy storage converter is located is used for representing whether the energy storage system where the energy storage converter is located is connected with a power grid or not according to the working environment of the energy storage system where the energy storage converter is located; when the working environment of the energy storage system where the energy storage converter is located is judged to be used for representing that the energy storage system where the energy storage converter is located is connected with a power grid, determining that the current condition of the energy storage system where the energy storage converter is located meets the preset working environment judgment condition; when the working environment of the energy storage system where the energy storage converter is located is judged to be used for indicating that the energy storage system where the energy storage converter is located is not connected with the power grid, the fact that the current condition of the energy storage system where the energy storage converter is located does not meet the preset working environment judgment condition is determined, and therefore judgment accuracy and reliability of whether the current condition of the energy storage system meets the preset working environment judgment condition can be improved.
Therefore, according to the alternative implementation manner, whether the current condition of the energy storage system where the energy storage converter is located meets the preset working environment judging condition can be judged according to the working environment of the energy storage system where the energy storage converter is located, the working mode of the energy storage converter is determined to be the grid-connected mode when the working environment judging condition is judged to be met, the accuracy of determining the grid-connected mode can be improved, the working mode of the energy storage converter is determined to be the off-grid mode when the working environment judging condition is judged not to be met, the accuracy of determining the off-grid mode can be improved, and the diversity and the flexibility of the working mode of the energy storage converter can be improved based on the current condition of the diversity of the energy storage system.
Example III
Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy control device based on an energy storage converter according to an embodiment of the invention. The energy control device based on the energy storage converter described in fig. 3 may be applied to an energy storage system, where the energy storage system may be used to implement flow control of energy between an energy storage battery and a power grid, and the energy storage system may include the energy storage converter and a plurality of battery packs. As shown in fig. 3, the energy control device based on the energy storage converter may include an acquisition module 301, a determination module 302, and a control module 303, where:
The collection module 301 is configured to collect a current signal of the energy storage converter, where the current signal of the energy storage converter includes an AC signal of an AC end of the energy storage converter and a DC signal of a DC end of the energy storage converter, the AC end of the energy storage converter is connected in parallel to an AC bus of the energy storage system, the AC end of the energy storage converter is connected to a power grid through the AC bus, the DC end of the energy storage converter is connected in parallel to a DC bus of the energy storage system, and the DC end of the energy storage converter is connected in parallel to all battery packs of the energy storage system through the DC bus.
The determining module 302 is configured to determine an operation mode of the energy storage converter according to an ac signal of an ac end of the energy storage converter, where the operation mode includes a grid-connected mode or an off-grid mode.
The determining module 302 is further configured to determine a workflow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a dc signal of a dc end of the energy storage converter.
The control module 303 is configured to control energy flow between the at least one battery pack and the power grid through the energy storage converter according to a workflow corresponding to an operation mode of the energy storage converter.
Therefore, the energy control device based on the energy storage converter described in fig. 3 can determine the working mode of the energy storage converter through the alternating current signal of the alternating current end of the energy storage converter, so that the accuracy of determining the working mode of the energy storage converter can be improved, then the working flow corresponding to the working mode of the energy storage converter is determined through the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter, the accuracy of determining the working flow corresponding to the working mode of the energy storage converter can be improved, the control accuracy of the energy storage converter can be improved, the energy flow between the energy storage battery and the power grid can be controlled through the energy storage converter, the accurate control of the energy flow between the energy storage battery and the power grid can be realized based on the accurately controlled energy storage converter, the control efficiency of the energy flow can be improved, the energy resource between the energy storage battery and the power grid can be fully utilized, and the intelligent transfer of the energy between the energy storage battery and the power grid can be realized.
In an alternative embodiment, the determining module 302 may specifically determine, according to the operation mode of the energy storage converter and the dc signal of the dc end of the energy storage converter, the operation flow corresponding to the operation mode of the energy storage converter according to the manner that the operation flow includes:
Determining a first working parameter of the direct current end of the energy storage converter according to the direct current signal of the direct current end of the energy storage converter;
According to the working mode of the energy storage converter, determining a second working parameter of an alternating current end of the energy storage converter, wherein the working flow corresponding to the working mode of the energy storage converter comprises a first working parameter of a direct current end of the energy storage converter and a second working parameter of the alternating current end of the energy storage converter.
Therefore, the first working parameter of the direct current end of the energy storage converter can be determined through the direct current signal of the direct current end of the energy storage converter, the determination accuracy of the first working parameter of the direct current end of the energy storage converter can be improved, the second working parameter of the alternating current end of the energy storage converter can be determined through the working mode of the energy storage converter, the determination accuracy of the second working parameter of the alternating current end of the energy storage converter can be improved, the working flow corresponding to the working mode of the energy storage converter can be accurately determined, and accordingly the follow-up control accuracy of the energy storage converter can be improved based on the determined working flow corresponding to the working mode of the accurate energy storage converter.
In this optional embodiment, as an optional implementation manner, the determining module 302 may specifically determine, according to the operation mode of the energy storage converter, the second operation parameter of the ac end of the energy storage converter, where the determining may include:
When the working mode of the energy storage converter is the off-grid mode, determining off-grid working parameters of the alternating-current end of the energy storage converter and determining mode switching conditions of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, wherein the mode switching conditions are used for indicating conditions corresponding to the switching of the working mode of the energy storage converter from the off-grid mode to the grid-connected mode; or alternatively
When the working mode of the energy storage converter is a grid-connected mode, determining grid-connected working parameters of the alternating-current end of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter, wherein the control strategy set comprises one or more of a constant-current strategy, a constant-power strategy and a constant-voltage strategy;
The second working parameters of the alternating current end of the energy storage converter comprise off-grid working parameters of the alternating current end of the energy storage converter and mode switching conditions of the energy storage converter in an off-grid mode, or grid-connected working parameters of the alternating current end of the energy storage converter and target control strategies corresponding to the grid-connected working parameters in a grid-connected mode.
Therefore, in the optional implementation manner, when the working mode of the energy storage converter is the off-grid mode, the off-grid working parameter of the alternating-current end of the energy storage converter and the mode switching condition of the energy storage converter can be accurately determined through the alternating-current signal of the alternating-current end of the energy storage converter; under the condition that the working mode of the energy storage converter is a grid-connected mode, the grid-connected working parameters of the alternating-current end of the energy storage converter and the target control strategies corresponding to the grid-connected working parameters are accurately determined through the alternating-current signals of the alternating-current end of the energy storage converter, and the selection diversity and the flexibility of the determination modes of the working flow corresponding to the working mode of the energy storage converter are improved based on the diversity of the working mode of the energy storage converter.
In another optional embodiment, the communication end of the energy storage converter and the communication ends of all the battery packs are connected with the communication end of an upper computer of the energy storage system, and a monitoring system is arranged on the upper computer and is used for monitoring the energy storage converter and/or all the battery packs;
and, the manner of controlling the energy flow between the at least one battery pack and the power grid by the energy storage converter by the control module 303 according to the workflow corresponding to the working mode of the energy storage converter may specifically include:
Monitoring the charge state of each battery pack through a monitoring system;
selecting a target battery set from all battery packs according to the charge states of all battery packs, wherein the target battery set comprises at least one target battery pack with the charge state meeting a preset state;
And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein all target battery sets included in the target battery set are battery sets needing to be charged or battery sets needing to be discharged.
Therefore, the optional embodiment can monitor the charge state of each energy storage battery pack through the monitoring system, then select the target battery pack set from the charge states of all the energy storage battery packs, accurately select the target battery pack set, and then control the energy flow between the accurately selected target battery pack set and the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, so that the control accuracy of the energy flow between the target battery pack set and the power grid can be improved to a certain extent, the occurrence of the situation of energy transfer on the target battery pack set which does not need to be subjected to energy transfer is reduced, and the energy transfer accuracy between the target battery pack set and the power grid is also facilitated.
In this alternative embodiment, as an alternative implementation manner, the control module 303 may specifically select the target battery set from all the battery packs according to the states of charge of all the battery packs, where the manner may include:
Classifying all the battery packs according to the charge states of all the battery packs to obtain classification results, wherein the classification results comprise a first type battery pack set and a second type battery pack set, the first type battery pack set is empty or all the battery packs contained in the first type battery pack set are charged battery packs with charging requirements, the second type battery pack set is empty or all the battery packs contained in the second type battery pack set are discharged battery packs with discharging requirements, and the first type battery pack set and the second type battery pack set are not empty at the same time;
A target battery set is selected from the first type battery set and the second type battery set, wherein the target battery set comprises the first type battery set and/or the second type battery set.
Therefore, according to the alternative embodiment, all the battery packs can be classified according to the charge states of all the battery packs, so that classification results (the classification results can comprise a first type battery pack set and a second type battery pack set) can be obtained, the accuracy and the reliability of classifying all the battery packs can be improved, then the target battery pack set is selected from the first type battery pack set and the second type battery pack set, the accurate selection of the target battery pack set can be realized, and the improvement of the control accuracy of energy flow between the target battery pack set and a power grid in subsequent control is facilitated based on the accurately selected target battery pack set.
In this alternative embodiment, as another alternative implementation manner, the control module 303 may specifically include, according to a workflow corresponding to an operation mode of the energy storage converter, controlling, by the energy storage converter, energy flow between the target battery set and the power grid, where the energy flow includes:
When all the target battery packs contained in the target battery pack set are battery packs needing to be charged, controlling a power grid to charge the target battery pack set through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter; or alternatively
When all the target battery packs contained in the target battery pack set are battery packs needing to be discharged, controlling the target battery pack set to discharge a power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter;
Wherein the energy flow between the target battery set and the power grid comprises the power grid charging the target battery set or the target battery set discharging the power grid.
Therefore, according to the alternative implementation mode, under the condition that the target battery set needs to be charged, the power grid is controlled to charge the target battery set through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, and the control accuracy of the power grid to charge the target battery set can be improved; and under the condition that the target battery set needs to be discharged, the target battery set is controlled to discharge the power grid through the energy storage converter according to the working flow corresponding to the working mode of the energy storage converter, so that the accuracy of controlling the target battery set to discharge the power grid can be improved, and the diversity and the flexibility of the control modes of charging and discharging between the target battery set and the power grid can be improved based on the diversity of the target battery set.
In yet another alternative embodiment, the determining module 302 may specifically determine the operation mode of the energy storage converter according to the ac signal of the ac end of the energy storage converter, where the determining module may include:
Analyzing the working environment of an energy storage system in which the energy storage converter is positioned according to an alternating current signal of an alternating current end of the energy storage converter;
and determining the working mode of the energy storage converter according to the working environment of the energy storage system in which the energy storage converter is positioned.
Therefore, according to the alternative embodiment, the working environment of the energy storage system where the energy storage converter is located can be analyzed through the alternating current signal of the alternating current end of the energy storage converter, the analysis accuracy of the working environment of the energy storage system can be improved, then the working mode of the energy storage converter is determined according to the working environment of the energy storage system where the energy storage converter is located, and the determination accuracy and reliability of the working mode of the energy storage converter can be improved based on the accurately analyzed working environment.
In this optional embodiment, as an optional implementation manner, the determining module 302 may specifically determine, according to an operating environment of an energy storage system in which the energy storage converter is located, an operating mode of the energy storage converter, which may include:
judging whether the current condition of the energy storage system where the energy storage converter is located meets the preset working environment judging condition according to the working environment of the energy storage system where the energy storage converter is located, wherein the working environment judging condition comprises the judging condition of the connection relation between the energy storage system where the energy storage converter is located and a power grid;
when the current condition of the energy storage system meets the working environment judgment condition, determining the working mode of the energy storage converter as a grid-connected mode;
And when the current condition of the energy storage system is judged to not meet the working environment judgment condition, determining the working mode of the energy storage converter as an off-grid mode.
Therefore, according to the alternative implementation manner, whether the current condition of the energy storage system where the energy storage converter is located meets the preset working environment judging condition can be judged according to the working environment of the energy storage system where the energy storage converter is located, the working mode of the energy storage converter is determined to be the grid-connected mode when the working environment judging condition is judged to be met, the accuracy of determining the grid-connected mode can be improved, the working mode of the energy storage converter is determined to be the off-grid mode when the working environment judging condition is judged not to be met, the accuracy of determining the off-grid mode can be improved, and the diversity and the flexibility of the working mode of the energy storage converter can be improved based on the current condition of the diversity of the energy storage system.
Example IV
Referring to fig. 4, fig. 4 is a schematic structural diagram of another energy control device based on an energy storage converter according to an embodiment of the invention. As shown in fig. 4, the energy control device based on the energy storage converter may include:
A memory 401 storing executable program codes;
A processor 402 coupled with the memory 401;
The processor 402 invokes executable program codes stored in the memory 401 to perform the steps in the energy control method based on the energy storage converter described in the first embodiment or the second embodiment of the present invention.
Example five
The embodiment of the invention discloses a computer storage medium which stores computer instructions for executing the steps in the energy control method based on the energy storage converter described in the first embodiment or the second embodiment of the invention when the computer instructions are called.
Example six
An embodiment of the present invention discloses a computer program product comprising a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps of the energy storage converter-based energy control method described in embodiment one or embodiment two.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses an energy control method and device based on an energy storage converter, which are disclosed by the embodiment of the invention only as a preferred embodiment of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (8)

1. The energy control method based on the energy storage converter is characterized in that the method is applied to an energy storage system, the energy storage system comprises the energy storage converter and a plurality of battery packs, communication ends of the energy storage converter and communication ends of all the battery packs are connected with communication ends of an upper computer of the energy storage system, the upper computer is provided with a monitoring system, and the monitoring system is used for monitoring the energy storage converter and/or all the battery packs, and the method comprises the following steps:
Collecting a current signal of the energy storage converter, wherein the current signal of the energy storage converter comprises an alternating current signal of an alternating current end of the energy storage converter and a direct current signal of a direct current end of the energy storage converter, the alternating current end of the energy storage converter is connected with an alternating current bus of the energy storage system in parallel, the alternating current end of the energy storage converter is connected with a power grid through the alternating current bus, the direct current end of the energy storage converter is connected with a direct current bus of the energy storage system in parallel, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the direct current bus;
determining a working mode of the energy storage converter according to an alternating current signal of an alternating current end of the energy storage converter, wherein the working mode comprises a grid-connected mode or an off-grid mode;
determining a working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter;
According to a working flow corresponding to the working mode of the energy storage converter, controlling energy flow between at least one battery pack and the power grid through the energy storage converter;
the determining the working flow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and the direct current signal of the direct current end of the energy storage converter comprises the following steps:
Determining a first working parameter of a direct current end of the energy storage converter according to a direct current signal of the direct current end of the energy storage converter;
determining a second working parameter of an alternating current end of the energy storage converter according to the working mode of the energy storage converter, wherein a working flow corresponding to the working mode of the energy storage converter comprises the first working parameter of a direct current end of the energy storage converter and the second working parameter of the alternating current end of the energy storage converter;
Wherein, according to the working mode of the energy storage converter, determining the second working parameter of the ac end of the energy storage converter includes:
When the working mode of the energy storage converter is the off-grid mode, determining off-grid working parameters of the alternating-current end of the energy storage converter and determining mode switching conditions of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, wherein the mode switching conditions are used for indicating the condition that the working mode of the energy storage converter is switched from the off-grid mode to the grid-connected mode, and the off-grid working parameters comprise maximum alternating-current power, alternating-current output voltage, alternating-current end frequency, a power factor adjusting range, current distortion rate and output efficiency; or alternatively
When the working mode of the energy storage converter is the grid-connected mode, determining grid-connected working parameters of the alternating current end of the energy storage converter according to alternating current signals of the alternating current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter, wherein the control strategy set comprises one or more combinations of a constant current strategy, a constant power strategy and a constant voltage strategy, and the grid-connected working parameters comprise output voltage precision, an output voltage range, an output frequency range, an output voltage THD value, output voltage unbalance degree, a dynamic time voltage amplitude mutation range and dynamic time voltage amplitude recovery time;
The second working parameters of the alternating current end of the energy storage converter comprise off-grid working parameters of the alternating current end of the energy storage converter and mode switching conditions of the energy storage converter in the off-grid mode, or grid-connected working parameters of the alternating current end of the energy storage converter and target control strategies corresponding to the grid-connected working parameters in the grid-connected mode;
And controlling, by the energy storage converter, energy flow between at least one battery pack and the power grid according to a workflow corresponding to a working mode of the energy storage converter, including:
Monitoring the charge state of each battery pack through the monitoring system;
Selecting a target battery set from all the battery packs according to the charge states of all the battery packs, wherein the target battery set comprises at least one target battery pack with the charge states meeting a preset state;
And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein all target battery sets included in the target battery set are battery sets needing to be charged or battery sets needing to be discharged.
2. The energy storage converter-based energy control method of claim 1, wherein said selecting a target set of battery packs from all of said battery packs based on states of charge of all of said battery packs comprises:
Classifying all the battery packs according to the charge states of all the battery packs to obtain a classification result, wherein the classification result comprises a first type battery pack set and a second type battery pack set, the first type battery pack set is empty or all battery packs contained in the first type battery pack set are charging battery packs with charging requirements, the second type battery pack set is empty or all battery packs contained in the second type battery pack set are discharging battery packs with discharging requirements, and the first type battery pack set and the second type battery pack set are not empty at the same time;
And selecting a target battery set from the first battery set and the second battery set, wherein the target battery set comprises the first battery set and/or the second battery set.
3. The energy control method based on an energy storage converter according to claim 1, wherein the controlling, by the energy storage converter, the energy flow between the target battery set and the power grid according to the workflow corresponding to the operation mode of the energy storage converter includes:
When all the target battery packs contained in the target battery pack set are battery packs needing to be charged, controlling the power grid to charge the target battery pack set through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter; or alternatively
When all the target battery packs contained in the target battery pack set are battery packs needing to be discharged, controlling the target battery pack set to discharge the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter;
wherein the energy flow between the target battery set and the grid comprises the grid charging the target battery set or the target battery set discharging the grid.
4. A method of energy control based on an energy storage converter according to any one of claims 1-3, wherein said determining an operating mode of the energy storage converter based on an ac signal at an ac end of the energy storage converter comprises:
analyzing the working environment of the energy storage system where the energy storage converter is located according to an alternating current signal of an alternating current end of the energy storage converter;
And determining the working mode of the energy storage converter according to the working environment of the energy storage system where the energy storage converter is located.
5. The energy control method based on an energy storage converter according to claim 4, wherein determining the working mode of the energy storage converter according to the working environment of the energy storage system in which the energy storage converter is located comprises:
judging whether the current condition of the energy storage system where the energy storage converter is located meets a preset working environment judgment condition according to the working environment of the energy storage system where the energy storage converter is located, wherein the working environment judgment condition comprises a judgment condition of the connection relation between the energy storage system where the energy storage converter is located and the power grid;
when the current condition of the energy storage system meets the working environment judging condition, determining the working mode of the energy storage converter as a grid-connected mode;
and when the current condition of the energy storage system is judged to not meet the working environment judgment condition, determining the working mode of the energy storage converter as an off-grid mode.
6. The utility model provides an energy control device based on energy storage converter, its characterized in that, the device is applied to energy storage system, energy storage system includes energy storage converter and a plurality of group battery, energy storage converter's communication end and all the communication end of group battery all is connected energy storage system's host computer's communication end, host computer exists monitored control system, monitored control system is used for to energy storage converter and/or all the group battery is monitored, and the device includes collection module, determination module and control module, wherein:
The acquisition module is used for acquiring current signals of the energy storage converter, wherein the current signals of the energy storage converter comprise alternating current signals of an alternating current end of the energy storage converter and direct current signals of a direct current end of the energy storage converter, the alternating current end of the energy storage converter is connected with an alternating current bus of the energy storage system in parallel, the alternating current end of the energy storage converter is connected with a power grid through the alternating current bus, the direct current end of the energy storage converter is connected with a direct current bus of the energy storage system in parallel, and the direct current end of the energy storage converter is connected with all battery packs of the energy storage system in parallel through the direct current bus;
The determining module is used for determining the working mode of the energy storage converter according to the alternating current signal of the alternating current end of the energy storage converter, wherein the working mode comprises a grid-connected mode or an off-grid mode;
The determining module is further configured to determine a workflow corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter;
the control module is used for controlling energy flow between at least one battery pack and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter;
The determining module determines a working procedure corresponding to the working mode of the energy storage converter according to the working mode of the energy storage converter and a direct current signal of a direct current end of the energy storage converter, wherein the working procedure comprises the following specific steps:
Determining a first working parameter of a direct current end of the energy storage converter according to a direct current signal of the direct current end of the energy storage converter;
determining a second working parameter of an alternating current end of the energy storage converter according to the working mode of the energy storage converter, wherein a working flow corresponding to the working mode of the energy storage converter comprises the first working parameter of a direct current end of the energy storage converter and the second working parameter of the alternating current end of the energy storage converter;
the determining module determines, according to the working mode of the energy storage converter, a second working parameter of an ac end of the energy storage converter in a manner specifically including:
When the working mode of the energy storage converter is the off-grid mode, determining off-grid working parameters of the alternating-current end of the energy storage converter and determining mode switching conditions of the energy storage converter according to alternating-current signals of the alternating-current end of the energy storage converter, wherein the mode switching conditions are used for indicating the condition that the working mode of the energy storage converter is switched from the off-grid mode to the grid-connected mode, and the off-grid working parameters comprise maximum alternating-current power, alternating-current output voltage, alternating-current end frequency, a power factor adjusting range, current distortion rate and output efficiency; or alternatively
When the working mode of the energy storage converter is the grid-connected mode, determining grid-connected working parameters of the alternating current end of the energy storage converter according to alternating current signals of the alternating current end of the energy storage converter, and determining a target control strategy corresponding to the grid-connected working parameters from a preset control strategy set of the energy storage converter, wherein the control strategy set comprises one or more combinations of a constant current strategy, a constant power strategy and a constant voltage strategy, and the grid-connected working parameters comprise output voltage precision, an output voltage range, an output frequency range, an output voltage THD value, output voltage unbalance degree, a dynamic time voltage amplitude mutation range and dynamic time voltage amplitude recovery time;
The second working parameters of the alternating current end of the energy storage converter comprise off-grid working parameters of the alternating current end of the energy storage converter and mode switching conditions of the energy storage converter in the off-grid mode, or grid-connected working parameters of the alternating current end of the energy storage converter and target control strategies corresponding to the grid-connected working parameters in the grid-connected mode;
and the control module controls the energy flow between at least one battery pack and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein the method specifically comprises the following steps of:
Monitoring the charge state of each battery pack through the monitoring system;
Selecting a target battery set from all the battery packs according to the charge states of all the battery packs, wherein the target battery set comprises at least one target battery pack with the charge states meeting a preset state;
And controlling energy flow between the target battery set and the power grid through the energy storage converter according to a working flow corresponding to the working mode of the energy storage converter, wherein all target battery sets included in the target battery set are battery sets needing to be charged or battery sets needing to be discharged.
7. An energy control device based on an energy storage converter, the device comprising:
A memory storing executable program code;
A processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the energy storage converter based energy control method of any one of claims 1-5.
8. A computer storage medium storing computer instructions which, when invoked, are adapted to perform the energy storage converter based energy control method of any one of claims 1-5.
CN202410252506.5A 2024-03-06 2024-03-06 Energy control method and device based on energy storage converter Active CN117833324B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103337869A (en) * 2013-07-17 2013-10-02 国家电网公司 Novel battery energy-storage system and function integration designing method thereof
CN109617101A (en) * 2018-11-14 2019-04-12 国电南京自动化股份有限公司 A kind of energy accumulation current converter charge and discharge mode control method for automatically switching
CN110943483A (en) * 2019-12-18 2020-03-31 国网智能科技股份有限公司 Micro-grid system and control method
CN112600216A (en) * 2020-11-30 2021-04-02 深圳供电局有限公司 Bus voltage and power control method
WO2023178887A1 (en) * 2022-03-24 2023-09-28 中国人民解放军海军工程大学 Large-capacity off-grid wind-photovoltaic hybrid hydrogen-production direct-current micro-grid and control method therefor
CN117220323A (en) * 2023-11-08 2023-12-12 深圳海辰储能科技有限公司 Method and device for controlling network connection and disconnection
CN117578697A (en) * 2024-01-15 2024-02-20 宁波亿储电气科技有限公司 Mining emergency energy storage converter and control method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103337869A (en) * 2013-07-17 2013-10-02 国家电网公司 Novel battery energy-storage system and function integration designing method thereof
CN109617101A (en) * 2018-11-14 2019-04-12 国电南京自动化股份有限公司 A kind of energy accumulation current converter charge and discharge mode control method for automatically switching
CN110943483A (en) * 2019-12-18 2020-03-31 国网智能科技股份有限公司 Micro-grid system and control method
CN112600216A (en) * 2020-11-30 2021-04-02 深圳供电局有限公司 Bus voltage and power control method
WO2023178887A1 (en) * 2022-03-24 2023-09-28 中国人民解放军海军工程大学 Large-capacity off-grid wind-photovoltaic hybrid hydrogen-production direct-current micro-grid and control method therefor
CN117220323A (en) * 2023-11-08 2023-12-12 深圳海辰储能科技有限公司 Method and device for controlling network connection and disconnection
CN117578697A (en) * 2024-01-15 2024-02-20 宁波亿储电气科技有限公司 Mining emergency energy storage converter and control method

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