CN113659683B - Virtual internal resistance control method for balancing among battery clusters - Google Patents
Virtual internal resistance control method for balancing among battery clusters Download PDFInfo
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- CN113659683B CN113659683B CN202110990934.4A CN202110990934A CN113659683B CN 113659683 B CN113659683 B CN 113659683B CN 202110990934 A CN202110990934 A CN 202110990934A CN 113659683 B CN113659683 B CN 113659683B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 44
- 229910006123 SOCa Inorganic materials 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 7
- 230000007774 longterm Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—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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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a virtual internal resistance control method for balancing among battery clusters, which comprises two parts of control of a balancing strategy and an adjusting device, wherein the balancing strategy comprises a starting balancing strategy and an operating balancing strategy, and the starting balancing strategy selects whether the balancing strategy is operated or not by comparing the magnitude of the output current and the average output current of the input battery clusters; the running balancing strategy adjusts the output voltage of the adjusting device according to the deviation state of the state of charge (SOC) of each battery cluster and the average value SOCa of all the SOCs to finish balancing treatment; the regulating device controls the work of the switching tube by regulating the output pulse width, thereby realizing the regulation of the output voltage of the regulating device. The application can realize stable control of the output voltage of the battery clusters, simultaneously ensure the equalization effect of parallel connection among the battery clusters, and avoid the condition of circulating current or power oscillation in parallel connection.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a virtual internal resistance control method for balancing among battery clusters.
Background
Energy storage technology mainly refers to the storage of electrical energy. The stored energy can be used as emergency energy, can also be used for storing energy when the load of the power grid is low, and can be used for outputting energy when the load of the power grid is high, so as to cut peaks and fill valleys and lighten the fluctuation of the power grid. Energy is in a variety of forms including radiation, chemical, gravitational potential energy, electrical potential energy, electricity, high temperature, latent heat and power. Energy storage involves converting energy in a form that is difficult to store into a more convenient or economically storable form.
The electrochemical energy storage has been widely used in various situations such as power generation side, power grid side and user side due to the advantages of quick response and the like. And due to factors such as cost, the electrochemical energy storage is developed towards high capacity, high power density and high power integration level. The technical route adopted to support the development in the direction is to increase the parallel branches of the battery clusters and increase the capacity of the single-machine system.
However, long-term operation shows that certain deviation of voltage among battery clusters can occur in the operation process, and internal resistance also changes to different degrees. The change can weaken the direct parallel connection capability of the battery clusters, so that circulation current is caused during zero-power operation, the battery clusters with large internal resistance can not be fully charged during charging, and the battery clusters with large internal resistance can not provide enough power during discharging. Long time, the situation that the whole system cannot continuously run due to the short plate effect generated after a pack of batteries is abnormal can occur. After the single-pack battery is maintained, the new battery pack is used for replacement, and the situation that the new battery and the old battery are used in a mixed mode exists, so that the difference is further increased.
Disclosure of Invention
In order to solve the above problems, the present application provides a virtual internal resistance control method for balancing among battery clusters, including a balancing strategy and a regulating device control, where the balancing strategy includes the following steps:
s1: configuring initial output voltage and maximum charge and discharge current of each battery cluster through a battery management module BMS;
s2: starting a single regulating device in sequence, and throwing the single regulating device into a direct current bus;
s3: sampling the voltage of a direct current bus, the voltage and the output current of each battery cluster in real time, and calculating the average output current of all the put-in battery clusters;
s4: comparing the output current of the input battery cluster with the average output current, and selecting whether to operate an equalization strategy;
s5: counting the SOC of each battery cluster through a battery management module BMS, and calculating an average value SOCa of all the SOCs;
s6: selecting whether to perform equalization processing or not by judging whether the operation power of the electric equipment exceeds a preset threshold value;
s7: judging states of the SOC of each battery cluster, wherein the deviation of the SOC and the SOCa exceeds a preset threshold range, and adjusting the output voltage of the adjusting device;
s8: judging whether the equalization processing of all the battery clusters is finished, if not, repeating the steps S5 to S8; otherwise, the equalization processing is exited;
the adjusting device control comprises the following steps:
a: sampling the output current, the output voltage and the input voltage of the regulating device of each battery cluster in real time;
b: the battery management module BMS configures the output voltage setting and the virtual resistance of the regulating device in a communication mode;
c: obtaining a droop voltage by multiplying the output current by the virtual resistor, and obtaining an output voltage reference by giving a difference between the output voltage and the droop voltage;
d: the deviation between the output voltage reference and the output voltage is output after passing through the PI regulator, and the control quantity is limited between the maximum discharging current and the maximum charging current, so as to obtain the output current reference;
e: outputting a control quantity after the deviation of the output current reference and the output current passes through the PI regulator, and limiting the control quantity between the maximum regulation deviation and the minimum regulation deviation to obtain a PWM modulation degree deviation;
f: dividing the output voltage by the input voltage to obtain a PWM modulation degree basic value, and overlapping the PWM modulation degree deviation with the PWM modulation degree basic value to obtain a PWM modulation degree, wherein the PWM modulation degree is compared with a carrier wave in real time, and the output pulse width is adjusted to drive a switching tube to work, so that the adjustment of the output voltage of the adjusting device is realized.
Specifically, the step S4 specifically includes the following steps:
s41: comparing the output current of the input battery cluster with the average output current respectively, and if the output current exceeds a preset threshold, indicating that the battery cluster has circulation with other battery clusters if the output current exceeds the threshold, performing step S42; otherwise, go to step S43;
s42: when the output current of the battery cluster is larger than the average output current, the output voltage of the battery cluster is reduced; when the output current of the battery cluster is smaller than the average output current, the output voltage of the battery cluster is increased, and then the step S3 and the step S4 are repeated;
s43: judging whether all the regulating devices of the battery clusters are put into operation, if so, configuring the maximum charge and discharge currents of all the regulating devices as the maximum operable value, and operating an equalization strategy; otherwise, step S2 is performed.
Specifically, step S6 is to perform equalization processing by judging whether the running power of the electric equipment exceeds a preset threshold value or not, if so; otherwise, the equalization is exited.
Specifically, the step S7 specifically includes the following steps:
s71: judging whether the deviation of the SOC and SOCa of each battery cluster is smaller than a preset threshold range, if so, reducing the output voltage of the adjusting device of the battery cluster;
s72: judging whether the deviation between the SOC and SOCa of each battery cluster is larger than a preset threshold range, if so, increasing the output voltage of the adjusting device of the battery cluster;
s73: and judging whether the output voltage of the regulating device of each battery cluster exceeds the highest or lowest limit, and if so, limiting the output voltage of the regulating device of the battery cluster to be within the highest and lowest limit ranges.
Specifically, the modulation device comprises a bypass switch and a voltage-regulating direct-current converter.
Specifically, the BATTERY management module BMS (BATTERY MANAGEMENT SYSTEM ) is connected to the modulation device.
The application has the beneficial effects that: the stable control of the output voltage of the battery clusters can be realized, the equalization effect of parallel connection among the battery clusters is ensured, and the condition of circulating current or power oscillation in parallel connection is avoided; independent management of each battery cluster can be realized, and the influence on the overall operation effect and the cycle life caused by inconsistent internal resistance and voltage of the battery due to long-term operation is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the startup equalization strategy of the present application;
FIG. 2 is a flow chart of the operation equalization strategy of the present application;
FIG. 3 is a flow chart of the output voltage control of the regulator of the present application;
FIG. 4 is a schematic diagram of an embodiment of the present application;
FIG. 5 is a schematic view of the structure of the adjusting device of the present application;
FIG. 6 is a main circuit diagram of the voltage regulating DC converter of the present application;
FIG. 7 is a schematic diagram of a voltage regulating DC converter according to the present application;
FIG. 8 is a block diagram of the output voltage control of the regulator of the present application;
FIG. 9 is a schematic diagram of an output voltage reference generating module according to the present application;
FIG. 10 is a schematic view of a voltage control loop module according to the present application;
FIG. 11 is a schematic diagram of a current control loop module according to the present application;
FIG. 12 is a schematic diagram of a feed-forward module structure according to the present application;
in the figure: the power system comprises a 1-direct current bus, a 2-battery cluster, a 3-energy storage converter, a 4-power grid, a 5-regulating device, a 6-bypass switch, a 7-regulating direct current converter, an 8-handle and a 9-battery management module BMS.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and may be a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Example 1:
referring to fig. 1-12, a virtual internal resistance control method for balancing among battery clusters includes two parts of control of a balancing strategy and a regulating device 5, wherein the balancing strategy includes a starting balancing strategy and an operating balancing strategy, and the starting balancing strategy includes the following steps:
s1: configuring initial output voltage and maximum charge and discharge current of each battery cluster 2 through a battery management module BMS 9; wherein, the maximum charge and discharge current should be limited to a smaller value, so as to avoid the impact current during the charging;
s2: starting the single regulating devices 5 in sequence and putting the single regulating devices into the direct current bus 1;
s3: sampling the voltage of the direct current bus 1, the voltage and the output current of each battery cluster 2 in real time, and calculating the average output current of all the put-in battery clusters 2;
s4: comparing the output current of the inputted battery cluster 2 with the average output current, and selecting whether to operate an equalization strategy.
Specifically, the battery management module BMS9 is commonly called as a battery nurse or a battery manager, and is mainly used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, and monitoring the state of the battery. The BMS battery management system unit comprises a BMS battery management system, a control module, a display module, a wireless communication module, electric equipment, a battery pack for supplying power to the electric equipment and an acquisition module for acquiring battery information of the battery pack, wherein the BMS battery management system is connected with the wireless communication module and the display module through communication interfaces respectively, the output end of the acquisition module is connected with the input end of the BMS battery management system, the output end of the BMS battery management system is connected with the input end of the control module, the control module is connected with the battery pack and the electric equipment respectively, and the BMS battery management system is connected with a Server through the wireless communication module.
Further, in the present embodiment, the step S4 specifically includes the following steps:
s41: respectively comparing the output current of the input battery cluster 2 with the average output current, and if the output current exceeds a preset threshold, indicating that the battery cluster 2 has circulation with other battery clusters if the output current exceeds the threshold, performing step S42; otherwise, go to step S43;
s42: when the output current of the battery cluster 2 is larger than the average output current, the output voltage of the battery cluster 2 is reduced; when the output current of the battery cluster 2 is smaller than the average output current, the output voltage of the battery cluster 2 is increased, and then the step S3 and the step S4 are repeated;
s43: judging whether all the regulating devices 5 of the battery clusters 2 are put into operation, if so, configuring the maximum charge and discharge currents of all the regulating devices 5 as the maximum operable value, and operating an equalization strategy; otherwise, step S2 is performed.
The operation equalization strategy comprises the following steps:
s5: counting the states of charge (SOC) of each battery cluster 2 through a battery management module (BMS 9), and calculating an average value (SOCa) of all the SOCs;
s6: selecting whether to perform equalization processing or not by judging whether the operation power of the electric equipment exceeds a preset threshold value;
s7: judging the state that the deviation between the state of charge (SOC) and the SOCa of each battery cluster 2 exceeds a preset threshold range, and adjusting the output voltage of the adjusting device 5;
s8: judging whether the equalization processing of all the battery clusters 2 is finished, if not, repeating the steps S5 to S8; otherwise, the equalization processing is exited.
Further, in the embodiment, step S6 is performed by determining whether the running power of the electric equipment exceeds a preset threshold, if yes, performing equalization processing; otherwise, the equalization is exited.
Further, in the present embodiment, the step S7 specifically includes the following steps:
s71: judging whether the deviation of the state of charge (SOC) and the SOCa of each battery cluster 2 is smaller than a preset threshold range, if so, reducing the output voltage of the regulating device 5 of the battery cluster 2;
s72: judging whether the deviation of the state of charge (SOC) and the SOCa of each battery cluster 2 is larger than a preset threshold range, if so, increasing the output voltage of the regulating device 5 of the battery cluster 2;
s73: it is determined whether the output voltage of the regulating device 5 of each battery cluster 2 exceeds the maximum or minimum limit, and if so, the output voltage of the regulating device 5 of the present battery cluster 2 is limited to be within the maximum and minimum limit ranges.
The control of the regulating device 5 comprises the following steps:
a: sampling the output current, the output voltage and the input voltage of the regulating device 5 of each battery cluster 2 in real time;
b: the battery management module BMS9 configures the output voltage setting and the virtual resistance of the regulating device 5 by means of communication;
c: obtaining a droop voltage by multiplying the output current by the virtual resistor, and obtaining an output voltage reference by giving a difference between the output voltage and the droop voltage;
d: the deviation between the output voltage reference and the output voltage is output after passing through the PI regulator, and the control quantity is limited between the maximum discharging current and the maximum charging current, so as to obtain the output current reference;
e: outputting a control quantity after the deviation of the output current reference and the output current passes through the PI regulator, and limiting the control quantity between the maximum regulation deviation and the minimum regulation deviation to obtain a PWM modulation degree deviation;
f: dividing the output voltage by the input voltage to obtain a PWM modulation degree basic value, and overlapping the PWM modulation degree deviation with the PWM modulation degree basic value to obtain a PWM modulation degree, wherein the PWM modulation degree is compared with a carrier wave in real time, and the output pulse width is adjusted to drive a switching tube to work, so that the output voltage of the regulating device 5 is regulated.
Referring to fig. 4-5, the present application proposes an embodiment, a virtual internal resistance adjusting device for balancing among battery clusters, including a plurality of battery clusters 2, where the battery clusters 2 are all connected with a dc bus 1 through an adjusting device 5, the adjusting device 5 includes a bypass switch 6 and a voltage-regulating dc converter 7, and the bypass switch 6 and the voltage-regulating dc converter 7 are connected in parallel; the direct current bus 1 is connected with the energy storage converter 3, the energy storage converter 3 is connected with the power grid 4, direct current is converted into alternating current through the energy storage converter 3, and the alternating current is connected into the power grid 4, so that energy exchange between the battery cluster 2 and the power grid 4 is realized. When the voltage-regulating direct-current converter 7 is not required to work or the voltage-regulating direct-current converter 7 is abnormal, the bypass switch 6 is attracted to directly connect the battery cluster 2 to the direct-current bus 1, and the virtual internal resistance corresponding to the battery cluster 2 is 0; when the voltage-regulating direct-current converter 7 is required to work, the bypass switch 6 is turned off, and the output characteristic of the voltage-regulating direct-current converter 7 is changed and regulated by regulating the output voltage of the voltage-regulating direct-current converter 7 connected with the battery cluster 2, so that the function of balancing the voltage and the State of charge (SOC) among the battery clusters 2 is achieved.
Further, in the present embodiment, a battery management module BMS9 is further included, and the battery management module BMS9 is connected to the adjusting device 5.
Further, referring to fig. 6-7, the dc-dc converter 7 includes a main control board, and a main control chip and a control circuit are disposed on the main control board.
Further, in this embodiment, the main control chip is of a model TMS320F28034. The chip is a DSP chip, also called a digital signal processor, is a microprocessor particularly suitable for digital signal processing operation, and is mainly applied to rapidly realizing various digital signal processing algorithms in real time.
Further, in this embodiment, the control circuit includes a closed-loop control circuit and an open-loop high-frequency control circuit, where the closed-loop control circuit is configured to implement closed-loop voltage control and current-limiting control; the open loop high frequency control circuit is used for realizing secondary side current balance. Specifically, the instantaneous closed-loop control circuit is completed by a three-level BUCK/BOOST topology (comprising filter capacitors C1-C4, switch tubes BT 1-BT 4 and energy storage inductors L1-L2), closed-loop voltage control and current limiting control can be performed, and the three-level BUCK/BOOST topology can reduce voltage regulation pressure difference, so that the efficiency is convenient to improve; the open loop high frequency control circuit is realized by a group of two-way full bridges (including switch tubes BT 5-BT 16, transformers T1-T2 and a filter capacitor C5) at a high voltage side and a low voltage side, and the two transformers in the middle are connected in series to perform forced inflow of the same current, so that secondary side current balance is realized. For example, the 1500V battery cluster 2 voltage is connected to the regulated dc converter 7, the voltage is reduced to 800V by the closed loop control circuit, and the output voltage is controlled to 40V by the open loop high frequency control circuit. (see FIG. 3)
Further, in this embodiment, the dc-dc converter 7 is provided with an indicator light and a communication interface, where the indicator light includes at least a power indicator light and an operating status indicator light; the communication interface at least comprises an IO interface, an RS485 interface and a CAN communication interface.
Further, in this embodiment, the handle 8 is disposed on the dc-dc converter 7, which is convenient for carrying, mounting and dismounting.
Specifically, the adjusting device 5 further includes a control module, where the control module includes an output voltage reference generating module, a voltage control loop module, a current control loop module, and a feedforward module, and the configuration parameters of the control module include an output voltage setting and a virtual resistor, the sampling parameters include an output current, an output voltage, and an input voltage, and the output parameter is a PWM modulation degree.
The output voltage reference generation module: and obtaining a droop voltage by multiplying the output current by the virtual resistor, and obtaining an output voltage reference by giving a difference between the output voltage and the droop voltage. (FIG. 9)
The voltage control loop module: and outputting a control quantity after the deviation between the output voltage reference and the output voltage is passed through the PI regulator, and limiting the control quantity between the maximum discharge current and the maximum charge current to obtain an output current reference. (FIG. 10)
The current control loop module: and outputting a control quantity after the deviation of the output current reference and the output electric current passes through the PI regulator, and limiting the control quantity between the maximum regulation deviation and the minimum regulation deviation to obtain the PWM modulation degree deviation. (FIG. 11)
The feed-forward module: dividing the output voltage by the input voltage to obtain a PWM modulation degree basic value, and overlapping the PWM modulation degree deviation with the PWM modulation degree basic value to obtain the PWM modulation degree. The modulation degree is compared with the carrier wave in real time, and the output pulse width is adjusted to drive the switching tube to work, so that the output voltage is adjusted. (FIG. 11)
According to the application, the SOC balance among the battery clusters 2 is realized by adjusting the output voltage of the adjusting device 5, so that the aim of independent management of each battery cluster 2 is fulfilled, and the problem that the integral operation effect and the cycle life are influenced due to inconsistent internal resistance and voltage of the battery caused by long-term operation is avoided.
It should be noted that, for simplicity of description, the foregoing embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required for the present application.
In the above embodiments, the basic principle and main features of the present application and advantages of the present application are described. It will be appreciated by persons skilled in the art that the present application is not limited by the foregoing embodiments, but rather is shown and described in what is considered to be illustrative of the principles of the application, and that modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application, and therefore, is within the scope of the appended claims.
Claims (4)
1. The virtual internal resistance control method for balancing among the battery clusters is characterized by comprising two parts of a balancing strategy and a regulating device (5), wherein the balancing strategy comprises the following steps:
s1: configuring initial output voltage and maximum charge and discharge current of each battery cluster (2) through a battery management module BMS (9);
s2: starting the single regulating devices (5) in sequence and putting the single regulating devices into the direct current bus (1);
s3: sampling the voltage of the direct current bus (1) and the voltage and output current of each battery cluster (2) in real time, and calculating the average output current of all the put-in battery clusters (2);
s4: comparing the output current of the input battery cluster (2) with the average output current, and selecting whether to operate an equalization strategy or not; the step S4 specifically comprises the following steps:
s41: respectively comparing the output current of the input battery cluster (2) with the average output current, and if the output current exceeds a preset threshold value, indicating that the battery cluster (2) and other battery clusters have circulation currents, then executing step S42; otherwise, go to step S43;
s42: when the output current of the battery cluster (2) is larger than the average output current, the output voltage of the battery cluster (2) is reduced; when the output current of the battery cluster (2) is smaller than the average output current, the output voltage of the battery cluster (2) is increased, and then the step S3 and the step S4 are repeated;
s43: judging whether all the regulating devices (5) of the battery clusters (2) are put into operation, if so, configuring the maximum charge and discharge currents of all the regulating devices (5) as the maximum value capable of operating, and operating an equalization strategy; otherwise, step S2 is carried out;
s5: counting the SOC of each battery cluster (2) through a battery management module BMS (9), and calculating the average value SOCa of all the SOCs;
s6: selecting whether to perform equalization processing or not by judging whether the operation power of the electric equipment exceeds a preset threshold value;
s7: judging states of the state of charge (SOC) and SOCa) of each battery cluster (2) exceeding a preset threshold range, and adjusting the output voltage of the adjusting device (5); the step S7 specifically comprises the following steps:
s71: judging whether the state of charge (SOC) of each battery cluster (2) is smaller than a preset threshold range of SOCa, if so, reducing the output voltage of a regulating device (5) of the battery cluster (2);
s72: judging whether the state of charge (SOC) of each battery cluster (2) is larger than a preset threshold range of SOCa, if so, increasing the output voltage of the regulating device (5) of the battery cluster (2);
s73: judging whether the output voltage of the regulating device (5) of each battery cluster (2) exceeds the highest limit or the lowest limit, if so, limiting the output voltage of the regulating device (5) of the battery cluster (2) to be within the highest limit and the lowest limit;
s8: judging whether the equalization processing of all the battery clusters (2) is finished, and if not, repeating the steps S5 to S8; otherwise, the equalization processing is exited;
the control of the adjusting device (5) comprises the following steps:
a: sampling the output current, the output voltage and the input voltage of the adjusting device (5) of each battery cluster (2) in real time;
b: the battery management module BMS (9) configures the output voltage setting and the virtual resistance of the regulating device (5) in a communication mode;
c: obtaining a droop voltage by multiplying the output current by the virtual resistor, and obtaining an output voltage reference by giving a difference between the output voltage and the droop voltage;
d: the deviation between the output voltage reference and the output voltage is output after passing through the PI regulator, and the control quantity is limited between the maximum discharging current and the maximum charging current, so as to obtain the output current reference;
e: outputting a control quantity after the deviation of the output current reference and the output current passes through the PI regulator, and limiting the control quantity between the maximum regulation deviation and the minimum regulation deviation to obtain a PWM modulation degree deviation;
f: dividing the output voltage by the input voltage to obtain a PWM modulation degree basic value, and overlapping the PWM modulation degree deviation with the PWM modulation degree basic value to obtain a PWM modulation degree, wherein the PWM modulation degree is compared with a carrier wave in real time, and the output pulse width is adjusted to drive a switching tube to work, so that the adjustment of the output voltage of the adjusting device (5) is realized.
2. The method for controlling virtual internal resistance for balancing among battery clusters as claimed in claim 1, wherein step S6 is to perform balancing processing by determining whether the running power of the electric equipment exceeds a preset threshold value, if yes; otherwise, the equalization is exited.
3. A virtual internal resistance control method for inter-cluster equalization of a battery as claimed in claim 1, characterized in that said regulating means (5) comprises a bypass switch (6) and a voltage regulating dc converter (7).
4. A virtual internal resistance control method for balancing between battery clusters according to claim 1, characterized in that the battery management module BMS (9) is connected to the regulating means (5).
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| CN114069789B (en) * | 2021-11-20 | 2023-09-22 | 傲普(上海)新能源有限公司 | Control circuit of battery cluster parallel circulation transformer |
| CN114204647B (en) * | 2022-01-06 | 2023-11-24 | 上海交通大学 | Parallel battery cluster state management system and parallel battery cluster |
| CN114583807B (en) * | 2022-05-09 | 2022-10-14 | 宁德时代新能源科技股份有限公司 | Method, device, equipment, storage medium and program product for controlling energy storage system |
| CN115800415B (en) * | 2022-06-17 | 2023-11-14 | 宁德时代新能源科技股份有限公司 | Battery management method, system, battery system and electronic equipment |
| CN115800420B (en) * | 2022-09-20 | 2023-10-20 | 宁德时代新能源科技股份有限公司 | Energy storage system and method for regulating an energy storage system |
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