CN117614073A - Control method and system based on energy storage PCS topological structure - Google Patents

Control method and system based on energy storage PCS topological structure Download PDF

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Publication number
CN117614073A
CN117614073A CN202311651872.XA CN202311651872A CN117614073A CN 117614073 A CN117614073 A CN 117614073A CN 202311651872 A CN202311651872 A CN 202311651872A CN 117614073 A CN117614073 A CN 117614073A
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China
Prior art keywords
soc
battery charging
value
discharging unit
battery
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CN202311651872.XA
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Chinese (zh)
Inventor
李润源
郭傅傲
贺振
王敦凯
肖小曼
薛青虎
施俊杰
石明
刘子涵
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Shanghai Investigation Design and Research Institute Co Ltd SIDRI
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Shanghai Investigation Design and Research Institute Co Ltd SIDRI
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Priority to CN202311651872.XA priority Critical patent/CN117614073A/en
Publication of CN117614073A publication Critical patent/CN117614073A/en
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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
    • 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]
    • 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
    • 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
    • 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
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery

Abstract

The embodiment of the invention relates to a control method and a system based on an energy storage PCS topological structure, wherein the control method comprises the following steps: acquiring the current SOC value of each battery charging and discharging unit; charging or discharging the battery charging and discharging units according to the current SOC value of the battery charging and discharging units and a preset first SOC threshold value; obtaining the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value; setting control voltage and initial SOC value of each battery charging and discharging unit according to loss parameters of each battery charging and discharging unit; and controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit. According to the technical scheme provided by the embodiment of the invention, the control strategy is formulated by utilizing the monitoring data of the energy storage unit, so that the working efficiency of the energy storage unit is improved.

Description

Control method and system based on energy storage PCS topological structure
Technical Field
The embodiment of the invention relates to the technical field of energy storage of power systems, in particular to a control method and a control system based on an energy storage PCS topological structure.
Background
The energy storage PCS is generally composed of a DC/AC converter, a DC/DC converter, an energy storage unit, a control unit, and the like. The modes of operation of the energy storage PCS generally include an inversion mode and a charging mode. In the inversion mode, the stored direct-current electric energy is converted into alternating-current electric energy by the energy storage PCS so as to supply alternating-current load; in the charging mode, the stored energy PCS converts ac power to dc power to charge the battery.
The energy storage PCS control technology promotes the development of a new energy power generation system, and can make up for the defect that the power generation capacity of the new energy power generation system is unstable and uncontrollable. How to realize the efficient and long-term operation of the energy storage unit becomes a problem to be solved.
Disclosure of Invention
Based on the above situation in the prior art, an object of an embodiment of the present invention is to provide a control method and a system based on an energy storage PCS topology structure, and utilize monitoring data of an energy storage unit to formulate a control strategy, so as to improve working efficiency of the energy storage unit.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a control method based on an energy storage PCS topology structure, the energy storage PCS topology structure including a new energy power generation module, an energy storage PCS module and an inverter module, the new energy power generation module and the energy storage PCS module being connected to the inverter module through a dc bus, the inverter module being connected to a power grid; the energy storage PCS module comprises a plurality of battery charging and discharging units which are connected in cascade through controllable switch units; the control method comprises the following steps:
acquiring the current SOC value of each battery charging and discharging unit;
according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value, charging or discharging operation is carried out on each battery charging and discharging unit, so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value;
obtaining the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value;
setting control voltage and initial SOC value of each battery charging and discharging unit according to loss parameters of each battery charging and discharging unit;
and controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit.
Further, according to the current SOC value and the preset first SOC threshold value of each battery charging and discharging unit, the charging or discharging operation for each battery charging and discharging unit includes:
sequencing according to the current SOC value of each battery charging and discharging unit;
generating a queue to be charged and a queue to be discharged according to the sequencing result and a preset first SOC threshold;
starting from a battery charging and discharging unit with the minimum SOC in the queue to be charged, starting from a battery charging and discharging unit with the maximum SOC in the queue to be discharged, and selecting the battery charging and discharging units from the queue to be charged and the queue to be discharged in sequence to perform corresponding charging and discharging operations.
Further, generating a queue to be charged and a queue to be discharged according to the sorting result and a preset first SOC threshold value includes:
if SOC is i ≥SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are put into a queue to be discharged;
if SOC is i ＜SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are placed in a queue to be charged;
the battery charging and discharging units in the queue to be charged are arranged from small to large according to the SOC value, and the battery charging and discharging units in the queue to be discharged are arranged from large to small according to the SOC value;
wherein SOC is i An SOC value indicating an i-th battery charge/discharge cell, i=1, … … N, N indicating the number of battery charge/discharge cells, and SOC TH1 Representing a preset first SOC threshold value.
Further, selecting a battery charging and discharging unit from the to-be-charged queue and the to-be-discharged queue, including:
the SOC values of the battery charging and discharging unit selected from the to-be-charged queue and the battery charging and discharging unit selected from the to-be-discharged queue meet the following conditions:
SOC di -SOC ci ＞ΔSOC TH 。
wherein SOC is di Representing the SOC value, SOC of a battery charge-discharge cell selected from a queue to be discharged ci Representing that the SOC value of the battery charging and discharging unit corresponding to the queue to be charged is selected from the queue to be charged, and delta SOC TH Representing a preset SOC difference threshold.
Further, calculating the loss parameters of the charge and discharge units of each battery according to the current internal resistance value, the temperature value and the capacity value of the battery, including:
wherein S represents a loss parameter of the battery charging/discharging unit, R represents a battery internal resistance value of the battery charging/discharging unit, K (SOC, R) 2 ) Representing the function of the SOC value of the battery charge-discharge unit along with the square change of the internal resistance value of the battery, C (t 1/3 ) A function representing a proportional decrease of the capacity value of the battery charge-discharge unit with 1/3 th power of time, Q (0) representing an initial capacity value of the battery charge-discharge unit, Q (T) representing a current capacity value of the battery charge-discharge unit, and T (T) representing a current temperature value of the battery charge-discharge unit; m represents a time constant.
Further, setting the control voltage and the initial SOC value of each battery charging and discharging unit according to the loss parameter of each battery charging and discharging unit, including:
if S is greater than or equal to S TH1 Control voltage u of the battery charging/discharging unit * To correspond to SOC TH1 The initial SOC value is the current SOC value of the battery charging and discharging unit;
if S TH2 ≤S＜S TH1 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to be corresponding to the open circuit voltage u * SOC value of (b);
wherein U is 0 Indicating the maximum bearing voltage of the battery charging and discharging unit, I max Represents the maximum current bearing of the battery charging and discharging unit, S TH1 Represents a first loss threshold, S TH2 Represents a second loss threshold, S TH2 ＜S TH1 。
Further, the method further comprises:
if S is less than S TH2 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to a preset second SOC threshold.
According to another aspect of the present invention, there is provided a control system based on an energy storage PCS topology structure, the energy storage PCS topology structure including a new energy power generation module, an energy storage PCS module and an inverter module, the new energy power generation module and the energy storage PCS module being connected to the inverter module through a dc bus, the inverter module being connected to a power grid; the energy storage PCS module comprises a plurality of battery charging and discharging units which are connected in cascade through controllable switch units; the control system includes:
the SOC value acquisition module is used for acquiring the current SOC value of each battery charging and discharging unit;
the charging and discharging control module is used for carrying out charging or discharging operation on each battery charging and discharging unit according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value;
the loss parameter acquisition module is used for acquiring the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit and calculating the loss parameter of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value;
the control parameter setting module is used for setting the control voltage and the initial SOC value of each battery charging and discharging unit according to the loss parameters of each battery charging and discharging unit;
and the control module is used for controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit.
Further, the charge/discharge control module performs charge or discharge operation on each battery charge/discharge unit according to the current SOC value and the preset first SOC threshold value of each battery charge/discharge unit, including:
sequencing according to the current SOC value of each battery charging and discharging unit;
generating a queue to be charged and a queue to be discharged according to the sequencing result and a preset first SOC threshold;
starting from a battery charging and discharging unit with the minimum SOC in the queue to be charged, starting from a battery charging and discharging unit with the maximum SOC in the queue to be discharged, and selecting the battery charging and discharging units from the queue to be charged and the queue to be discharged in sequence to perform corresponding charging and discharging operations.
Further, the charge-discharge control module generates a queue to be charged and a queue to be discharged according to the sorting result and a preset first SOC threshold value, including:
if SOC is i ≥SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are put into a queue to be discharged;
if SOC is i ＜SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are placed in a queue to be charged;
the battery charging and discharging units in the queue to be charged are arranged from small to large according to the SOC value, and the battery charging and discharging units in the queue to be discharged are arranged from large to small according to the SOC value;
wherein SOC is i An SOC value indicating an i-th battery charge/discharge cell, i=1, … … N, N indicating the number of battery charge/discharge cells, and SOC TH1 Representing a preset first SOC threshold value.
In summary, the embodiment of the invention provides a control method and a system based on an energy storage PCS topology structure, wherein the control method comprises the following steps: acquiring the current SOC value of each battery charging and discharging unit; according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value, charging or discharging operation is carried out on each battery charging and discharging unit, so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value; obtaining the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value; setting control voltage and initial SOC value of each battery charging and discharging unit according to loss parameters of each battery charging and discharging unit; and controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit. According to the technical scheme provided by the embodiment of the invention, the control strategy is formulated by utilizing the monitoring data of the energy storage unit, so that the working efficiency of the energy storage unit is improved.
Drawings
Fig. 1 is a schematic diagram of an energy storage PCS topology structure provided in an embodiment of the present invention;
fig. 2 is a schematic circuit configuration diagram of an energy storage PCS module according to an embodiment of the invention;
fig. 3 is a flowchart of a control method based on an energy storage PCS topology structure according to an embodiment of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present invention should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The use of the terms "first," "second," and the like in one or more embodiments of the present invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The technical scheme of the invention is described in detail below with reference to the accompanying drawings. The embodiment of the invention provides a control method based on an energy storage PCS topological structure, wherein a schematic diagram of the energy storage PCS topological structure provided by the embodiment of the invention is shown in fig. 1, and the energy storage PCS topological structure comprises a new energy power generation module, an energy storage PCS module and an inversion module as shown in fig. 1. The new energy power generation module is, for example, a photovoltaic power generation module, a wind power generation module, or the like, and is not particularly limited herein. The new energy power generation module and the energy storage PCS module are connected to the inversion module through a direct current bus, and the inversion module is connected with a power grid. The generated energy output by the new energy power generation module is influenced by natural factors, fluctuation is large, the output electric energy can be compensated through the energy storage PCS module in the energy storage PCS topological structure, when the electric energy output by the new energy power generation module is large, the battery charging and discharging unit in the energy storage PCS module is charged through the direct current bus so as to store redundant electric energy, and when the electric energy output by the new energy power generation module is small, the battery charging and discharging unit in the energy storage PCS module is discharged through the direct current bus so as to compensate insufficient electric energy. The inversion module is used for converting direct current of the direct current bus into alternating current and outputting the alternating current to the power grid. A schematic diagram of the circuit configuration of an energy storage PCS module is shown in fig. 2, which includes a number of battery charge-discharge units connected in cascade through controllable switch units (not shown). Each battery charging and discharging unit comprises a battery cell capable of being used for charging and discharging, a switch circuit for controlling the charging and discharging of the battery cell, and a monitoring unit for monitoring parameters such as open-circuit voltage, battery internal resistance value, temperature value and capacity value of each battery cell, wherein the specific circuit constitution of the monitoring unit or the selection of a sensor can be selected according to actual needs, and the specific limitation is omitted. The energy storage PCS topological structure can also comprise a control module, each battery charging and discharging unit can be connected into a cascade form through a controllable switch unit according to a control signal output by the control module, electric energy is compensated during the working period of the new energy power generation module, and the battery charging and discharging unit can also be connected into a charging or discharging form according to a control signal output by the control module, and the charging or discharging operation is carried out during the non-working period of the new energy power generation module so as to achieve a desired SOC value and prepare for compensation work.
Fig. 3 shows a flowchart of a control method based on an energy storage PCS topology structure according to an embodiment of the present invention, and as shown in fig. 3, the control method includes the following steps:
s302, acquiring the current SOC value of each battery charging and discharging unit. The current SOC value of the battery charging and discharging unit, that is, the SOC value of the battery cell in the battery charging and discharging unit, may be obtained, for example, by measuring the open circuit voltage of the battery cell and according to a function curve of the open circuit voltage and the SOC value.
And S304, carrying out charging or discharging operation on each battery charging and discharging unit according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value, so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value. The preset first SOC threshold may be obtained by comprehensive calculation according to past power generation data of the new energy power generation module, past power demand data of the power grid, the number of battery charging and discharging units (battery cells) included in the energy storage PCS module, nominal data of the battery charging and discharging units (battery cells), and the like, so as to enable the energy storage PCS module to ensure that the new energy power generation module can normally supply power to the power grid in the next power generation working period.
According to some alternative embodiments, the charging or discharging operation of each battery charging and discharging unit according to the current SOC value and the preset first SOC threshold value of each battery charging and discharging unit may include the following steps:
s3041, sorting according to the current SOC values of the charging and discharging units of the batteries. The battery charging and discharging units may be arranged in order from large to small according to the current SOC value of each battery charging and discharging unit.
S3042, generating a queue to be charged and a queue to be discharged according to the sorting result and a preset first SOC threshold. In the ordered queue, comparing the SOC values of the battery charging and discharging units with a preset first SOC threshold value in turn, if the current SOC value of the battery charging and discharging unit is SOC i ≥SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are put into a queue to be discharged; if SOC is i ＜SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are placed in a queue to be charged; the battery charging and discharging units in the queue to be charged are arranged from small to large according to the SOC value, and the battery charging and discharging units in the queue to be charged are arranged from large to small according to the SOC value; wherein SOC is i An SOC value indicating an i-th battery charge/discharge cell, i=1, … … N, N indicating the number of battery charge/discharge cells, and SOC TH1 Representing a preset first SOC threshold value.
S3043, starting from a battery charging and discharging unit with the minimum SOC in the queue to be charged, starting from a battery charging and discharging unit with the maximum SOC in the queue to be discharged, and sequentially selecting the battery charging and discharging units from the queue to be charged and the queue to be discharged to perform corresponding charging and discharging operations. The SOC value should satisfy:
SOC di -SOC ci ＞ΔSOC TH 。
wherein SOC is di Representing the SOC value, SOC of a battery charge-discharge cell selected from a queue to be discharged ci Representing that the SOC value of the battery charging and discharging unit corresponding to the queue to be charged is selected from the queue to be charged, and delta SOC TH Representing a preset SOC difference threshold.
If the SOC values of the battery charging and discharging unit selected from the to-be-charged queue and the battery charging and discharging unit selected from the to-be-discharged queue do not meet the requirements of the formula, the control unit controls the controllable switch unit to connect the battery charging and discharging unit to an external charging and discharging circuit for charging or discharging operation.
S306, obtaining the current internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current internal resistance value, the temperature value and the capacity value. In this step, the loss parameters of the battery charge and discharge cells can be calculated using the following formula:
wherein S represents the loss parameter of the battery charging and discharging unit, R represents the battery internal resistance value of the battery charging and discharging unit, K (, SOC, R) 2 ) Representing the function of the SOC value of the battery charge-discharge unit along with the square change of the internal resistance value of the battery, C (t 1/3 ) A function representing a proportional decrease of the capacity value of the battery charge-discharge unit with 1/3 th power of time, Q (0) representing an initial capacity value of the battery charge-discharge unit, Q (T) representing a current capacity value of the battery charge-discharge unit, and T (T) representing a current temperature value of the battery charge-discharge unit; m represents a time constant.
The loss degree of the battery is comprehensively related to factors such as the internal resistance loss, the service time and the temperature of the battery. The above formula for calculating the loss parameters of the battery charging and discharging unit can relatively accurately reflect the influence of factors such as internal resistance loss, service time, temperature and the like on the battery loss, the loss parameters of the battery charging and discharging unit are calculated by using the formula, the current loss condition of the corresponding battery unit is reflected according to the magnitude of the loss parameters, the initial SOC value of the battery charging and discharging unit and the control voltage value thereof in the working process are specified according to the current loss condition of the corresponding battery unit, and the battery unit with higher loss degree can be prevented from accelerating loss and generating larger influence on the energy storage process.
S308, setting the control voltage and the initial SOC value of each battery charging and discharging unit according to the loss parameters of each battery charging and discharging unit. According to some alternative embodiments, the setup procedure may comprise the steps of:
s3081 if S is greater than or equal to S TH1 Control voltage u of the battery charging/discharging unit * To correspond to SOC TH1 The initial SOC value is the current SOC value of the battery charging and discharging unit.
S3082, if S TH2 ≤S＜S TH1 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to be corresponding to the open circuit voltage u * SOC value of (b).
S3083 if S is less than S TH2 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to a preset second SOC threshold.
Wherein U is 0 Indicating the maximum bearing voltage of the battery charging and discharging unit, I max Represents the maximum current bearing of the battery charging and discharging unit, S TH1 Represents a first loss threshold, S TH2 Represents a second loss threshold, S TH2 ＜S TH1 。
And determining a control strategy according to the comparison between the loss parameter calculated by the calculation formula and the loss threshold value. When the loss parameter is greater than or equal to the first loss threshold, it indicates that the loss degree of the battery cell in the battery charging and discharging unit is lower, and normal compensation operation can be performed, so that the battery open circuit voltage corresponding to the first SOC threshold is set according to the SOC value set in step S304, that is, the preset first SOC threshold is set as the initial SOC value. When the loss parameter is smaller than the first loss threshold but greater than or equal to the second loss threshold, it indicates that the loss of the battery cell in the battery charging and discharging unit reaches a certain degree, and the normal participation in the charging and discharging process may cause the accelerated loss of the battery cell or the damage of the battery cell to occur, so that the whole energy storage PCS cannot work normally, and according to the loss level of the battery cell at this time (according to the corresponding internal resistance value), the control voltage of the battery cell of the battery charging and discharging unit is set to a voltage level corresponding to the current internal resistance value and the maximum working current of the battery cell: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to be corresponding to the open circuit voltage u * SOC value of (b). When the loss parameter is smaller than the second loss threshold, the loss of the battery cell in the battery charging and discharging unit is relatively seriousThe normal participation in the charge and discharge process may cause accelerated loss of the battery cell or damage of the battery cell, resulting in that the entire energy storage PCS cannot normally operate, and therefore, according to the loss level of the battery cell at this time (according to the corresponding internal resistance value), the control voltage of the battery charge and discharge unit cell is set to a voltage level corresponding to the current internal resistance value and the maximum operating current of the battery cell: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to a preset second SOC threshold value, and the preset second SOC threshold value represents the SOC lower limit value of the battery charging and discharging unit. According to the embodiment of the invention, the initial working state of the battery charging and discharging unit before the next power generation working period is set according to the real-time monitoring data of the battery charging and discharging unit, so that each battery charging and discharging unit can be ensured to better play a role in the working process, the battery loss is delayed, and the power generation efficiency is improved.
S310, controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit. In this step, the control voltage and the initial SOC value of the control voltage of each battery charge-discharge unit are set in accordance with the above steps before the start of the next power generation operation cycle. The initial SOC value may be set by performing a charge-discharge operation by connecting the battery charge-discharge unit to a corresponding charge-discharge circuit. The setting of the control voltage may be achieved by setting the control voltage in the control module and controlling the duty ratio of the switching circuit in the battery charging and discharging unit by the control module.
According to an embodiment of the invention, there is further provided a control system based on an energy storage PCS topology structure, the energy storage PCS topology structure comprises a new energy power generation module, an energy storage PCS module and an inversion module, the new energy power generation module and the energy storage PCS module are connected to the inversion module through a direct current bus, and the inversion module is connected with a power grid; the energy storage PCS module comprises a plurality of battery charging and discharging units which are connected in cascade through controllable switch units; the control system includes:
the SOC value acquisition module is used for acquiring the current SOC value of each battery charging and discharging unit;
the charging and discharging control module is used for carrying out charging or discharging operation on each battery charging and discharging unit according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value;
the loss parameter acquisition module is used for acquiring the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit and calculating the loss parameter of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value;
the control parameter setting module is used for setting the control voltage and the initial SOC value of each battery charging and discharging unit according to the loss parameters of each battery charging and discharging unit;
and the control module is used for controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit.
The specific process of each module in the control system based on the energy storage PCS topology structure to realize its function is the same as each step of the control method based on the energy storage PCS topology structure according to the above embodiment of the invention, and the repetitive description thereof will be omitted herein.
In summary, the embodiment of the invention relates to a control method and a system based on an energy storage PCS topological structure, wherein the control method comprises the following steps: acquiring the current SOC value of each battery charging and discharging unit; according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value, charging or discharging operation is carried out on each battery charging and discharging unit, so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value; obtaining the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value; setting control voltage and initial SOC value of each battery charging and discharging unit according to loss parameters of each battery charging and discharging unit; and controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit. According to the technical scheme provided by the embodiment of the invention, the control strategy is formulated by utilizing the monitoring data of the energy storage unit, so that the working efficiency of the energy storage unit is improved.
It should be understood that the above discussion of any of the embodiments is exemplary only and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the spirit of the invention, steps may be implemented in any order and there are many other variations of the different aspects of one or more embodiments of the invention described above which are not provided in detail for the sake of brevity. The above detailed description of the present invention is merely illustrative or explanatory of the principles of the invention and is not necessarily intended to limit the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims (10)

1. The control method based on the energy storage PCS topological structure is characterized in that the energy storage PCS topological structure comprises a new energy power generation module, an energy storage PCS module and an inversion module, wherein the new energy power generation module and the energy storage PCS module are connected to the inversion module through a direct current bus, and the inversion module is connected with a power grid; the energy storage PCS module comprises a plurality of battery charging and discharging units which are connected in cascade through controllable switch units; the control method comprises the following steps:
acquiring the current SOC value of each battery charging and discharging unit;
according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value, charging or discharging operation is carried out on each battery charging and discharging unit, so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value;
obtaining the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit, and calculating the loss parameters of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value;
setting control voltage and initial SOC value of each battery charging and discharging unit according to loss parameters of each battery charging and discharging unit;
and controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit.
2. The method according to claim 1, wherein the charging or discharging operation of each battery charging and discharging unit according to the current SOC value of each battery charging and discharging unit and the preset first SOC threshold value, comprises:
sequencing according to the current SOC value of each battery charging and discharging unit;
generating a queue to be charged and a queue to be discharged according to the sequencing result and a preset first SOC threshold;
starting from a battery charging and discharging unit with the minimum SOC in the queue to be charged, starting from a battery charging and discharging unit with the maximum SOC in the queue to be discharged, and selecting the battery charging and discharging units from the queue to be charged and the queue to be discharged in sequence to perform corresponding charging and discharging operations.
3. The method of claim 2, wherein generating a queue to be charged and a queue to be discharged based on the ranking result and a preset first SOC threshold value comprises:
if SOC is i ≥SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are put into a queue to be discharged;
if SOC is i <SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are placed in a queue to be charged;
the battery charging and discharging units in the queue to be charged are arranged from small to large according to the SOC value, and the battery charging and discharging units in the queue to be discharged are arranged from large to small according to the SOC value;
wherein SOC is i An SOC value indicating an i-th battery charge/discharge cell, i=1, … … N, N indicating the number of battery charge/discharge cells, and SOC TH1 Representing a preset first SOC threshold value.
4. A method according to claim 3, wherein selecting battery charge and discharge cells from the queue to be charged and the queue to be discharged comprises:
the SOC values of the battery charging and discharging unit selected from the to-be-charged queue and the battery charging and discharging unit selected from the to-be-discharged queue meet the following conditions:
SOC di -SOC ci >ΔSOC TH 。
wherein SOC is di Representing the SOC value, SOC of a battery charge-discharge cell selected from a queue to be discharged ci Representing that the SOC value of the battery charging and discharging unit corresponding to the queue to be charged is selected from the queue to be charged, and delta SOC TH Representing a preset SOC difference threshold.
5. The method of claim 1, wherein calculating the loss parameter for each battery charge-discharge cell based on the current battery internal resistance value, the temperature value, and the capacity value comprises:
wherein S represents a loss parameter of the battery charging/discharging unit, R represents a battery internal resistance value of the battery charging/discharging unit, K (SOC, R) 2 ) Representing the function of the SOC value of the battery charge-discharge unit along with the square change of the internal resistance value of the battery, C (t 1/3 ) A function representing a proportional decrease of the capacity value of the battery charge-discharge unit with 1/3 th power of time, Q (0) representing an initial capacity value of the battery charge-discharge unit, Q (T) representing a current capacity value of the battery charge-discharge unit, and T (T) representing a current temperature value of the battery charge-discharge unit; m represents a time constant.
6. The method of claim 5, wherein setting the control voltage and the starting SOC value for each battery charge-discharge cell in accordance with the loss parameter for each battery charge-discharge cell comprises:
if S is greater than or equal to S TH1 Control voltage u of the battery charging/discharging unit * To correspond to SOC TH1 The initial SOC value is the current SOC value of the battery charging and discharging unit;
if S TH2 ≤S<S TH1 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to be corresponding to the open circuit voltage u * SOC value of (b);
wherein U is 0 Indicating the maximum bearing voltage of the battery charging and discharging unit, I max Represents the maximum current bearing of the battery charging and discharging unit, S TH1 Represents a first loss threshold, S TH2 Represents a second loss threshold, S TH2 <S TH1 。
7. The method of claim 6, wherein the method further comprises:
if S<S TH2 Control voltage u of the battery charging/discharging unit * The method comprises the following steps: u (u) * ＝U 0 -I max R, the initial SOC value is adjusted to a preset second SOC threshold.
8. The control system based on the energy storage PCS topological structure is characterized by comprising a new energy power generation module, an energy storage PCS module and an inversion module, wherein the new energy power generation module and the energy storage PCS module are connected to the inversion module through a direct current bus, and the inversion module is connected with a power grid; the energy storage PCS module comprises a plurality of battery charging and discharging units which are connected in cascade through controllable switch units; the control system includes:
the SOC value acquisition module is used for acquiring the current SOC value of each battery charging and discharging unit;
the charging and discharging control module is used for carrying out charging or discharging operation on each battery charging and discharging unit according to the current SOC value of each battery charging and discharging unit and a preset first SOC threshold value so that the SOC value of each battery charging and discharging unit reaches the preset first SOC threshold value;
the loss parameter acquisition module is used for acquiring the current battery internal resistance value, the temperature value and the capacity value of each battery charging and discharging unit and calculating the loss parameter of each battery charging and discharging unit according to the current battery internal resistance value, the temperature value and the capacity value;
the control parameter setting module is used for setting the control voltage and the initial SOC value of each battery charging and discharging unit according to the loss parameters of each battery charging and discharging unit;
and the control module is used for controlling the working state of the energy storage PCS module according to the control voltage and the initial SOC value of each battery charging and discharging unit.
9. The system of claim 8, wherein the charge/discharge control module performs a charge or discharge operation on each battery charge/discharge unit according to a current SOC value of each battery charge/discharge unit and a preset first SOC threshold value, comprising:
sequencing according to the current SOC value of each battery charging and discharging unit;
generating a queue to be charged and a queue to be discharged according to the sequencing result and a preset first SOC threshold;
starting from a battery charging and discharging unit with the minimum SOC in the queue to be charged, starting from a battery charging and discharging unit with the maximum SOC in the queue to be discharged, and selecting the battery charging and discharging units from the queue to be charged and the queue to be discharged in sequence to perform corresponding charging and discharging operations.
10. The system of claim 9, wherein the charge-discharge control module generates a queue to be charged and a queue to be discharged according to the ordering result and a preset first SOC threshold value, comprising:
if SOC is i ≥SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are put into a queue to be discharged;
if SOC is i <SOC TH1 The SOC is then set i The corresponding battery charging and discharging units are placed in a queue to be charged;
the battery charging and discharging units in the queue to be charged are arranged from small to large according to the SOC value, and the battery charging and discharging units in the queue to be discharged are arranged from large to small according to the SOC value;
wherein SOC is i An SOC value indicating an i-th battery charge/discharge cell, i=1, … … N, N indicating the number of battery charge/discharge cells，SOC TH1 Representing a preset first SOC threshold value.
CN202311651872.XA 2023-12-04 2023-12-04 Control method and system based on energy storage PCS topological structure Pending CN117614073A (en)

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CN103887853A (en) * 2014-03-18 2014-06-25 浙江大学城市学院 Balance control method of lithium-ion battery set
US20230207905A1 (en) * 2021-06-11 2023-06-29 Shanghai Makesens Energy Storage Technology Co., Ltd. Method and apparatus for dynamic management and control of lithium battery energy storage system, and electronic device therewith
CN116853024A (en) * 2023-08-22 2023-10-10 广汽埃安新能源汽车股份有限公司 Charging control method, charging circuit topology structure, electronic device and storage medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101425698A (en) * 2007-10-30 2009-05-06 索尼株式会社 Battery pack, method of charging secondary battery and battery charger
CN103887853A (en) * 2014-03-18 2014-06-25 浙江大学城市学院 Balance control method of lithium-ion battery set
US20230207905A1 (en) * 2021-06-11 2023-06-29 Shanghai Makesens Energy Storage Technology Co., Ltd. Method and apparatus for dynamic management and control of lithium battery energy storage system, and electronic device therewith
CN116853024A (en) * 2023-08-22 2023-10-10 广汽埃安新能源汽车股份有限公司 Charging control method, charging circuit topology structure, electronic device and storage medium

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