CN117335526A - Power conversion device, control method thereof and power supply system - Google Patents

Power conversion device, control method thereof and power supply system Download PDF

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Publication number
CN117335526A
CN117335526A CN202311338036.6A CN202311338036A CN117335526A CN 117335526 A CN117335526 A CN 117335526A CN 202311338036 A CN202311338036 A CN 202311338036A CN 117335526 A CN117335526 A CN 117335526A
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CN
China
Prior art keywords
current value
battery
conversion device
power
power conversion
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Pending
Application number
CN202311338036.6A
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Chinese (zh)
Inventor
王昊
李世军
舒成维
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If New Energy Technology Wuxi Co ltd
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If New Energy Technology Wuxi Co ltd
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Priority to CN202311338036.6A priority Critical patent/CN117335526A/en
Publication of CN117335526A publication Critical patent/CN117335526A/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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power conversion device, a control method thereof and a power supply system. A first side of the power conversion device is connected with the battery, and a second side of the power conversion device is selectively connected with a power grid or a load; the method comprises the following steps: sampling to obtain an electrical parameter of a second side of the power conversion device; determining an actual current value of the battery based at least on the electrical parameter of the second side, wherein the actual current value comprises an actual charging current value or an actual discharging current value; the operation of the power conversion device is adjusted based on the actual current value. The technical scheme of the invention improves the accuracy of battery current determination.

Description

Power conversion device, control method thereof and power supply system
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a power conversion device, a control method thereof, and a power supply system.
Background
With the rapid development of new energy technology, batteries are increasingly used. There is a bi-directional power conversion device that can convert electric energy discharged from a battery into another form of electric energy to be supplied to a load, and can also charge the battery using an external power source.
In order to ensure that the current of the battery in charging or discharging meets the charging and discharging requirements, the power conversion device needs to acquire the current of the battery side in the charging and discharging process in the operation process so as to timely regulate the charging and discharging current of the battery when the charging and discharging current of the battery does not meet the requirements.
At present, current in the process of charging and discharging a battery is mostly obtained through a current sensor or a signal sampling circuit. However, the charge and discharge current of the battery at the low voltage side is relatively large, the current variation range is wide, a large collection range is required, the cost of the current sensor or the signal sampling circuit is high, and the charge and discharge current of the battery is difficult to accurately obtain.
Disclosure of Invention
The invention provides a power conversion device, a control method thereof and a power supply system, which are used for solving the problems of high battery current sampling cost and low accuracy.
According to an aspect of the present invention, there is provided a control method of a power conversion device, a first side of the power conversion device being connected to a battery, a second side of the power conversion device being selectively connected to a grid or a load; the method comprises the following steps:
sampling to obtain an electrical parameter of a second side of the power conversion device;
Determining an actual current value of the battery based at least on the electrical parameter of the second side, wherein the actual current value comprises an actual charge current value or an actual discharge current value;
and adjusting the operation of the power conversion device based on the actual current value.
Optionally, the sampling obtains an electrical parameter of the second side of the power conversion device, including:
sampling to obtain a first voltage value and a first current value of a second side of the power conversion device;
said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
sampling to obtain an actual voltage value of the battery at a first side of the power conversion device;
determining a first power value of the second side according to the first voltage value and the first current value;
an actual current value of the battery is determined based on the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value.
Optionally, determining the actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value includes:
determining a power range in which the first power value is located;
And determining an actual current value of the battery according to the conversion efficiency of the power conversion device corresponding to the power range, the actual voltage value of the battery and the first power value.
Optionally, determining the actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value includes:
determining a second power value of a first side of the power conversion device according to the conversion efficiency and the first power value;
and determining an actual current value of the battery according to the second power value and the actual voltage value of the battery.
Optionally, the sampling obtains an electrical parameter of the second side of the power conversion device, including:
sampling to obtain a second current value of a second side of the power conversion device;
said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
and determining the actual current value of the battery according to the mapping relation between the second current value of the second side and the battery current.
Optionally, the mapping relationship between the second current value of the second side and the battery current is determined according to the following manner:
respectively sampling a first side current value and a second side current value of the power conversion device under test conditions;
And fitting a mapping relation curve according to the first side current value and the second side current value.
Optionally, the sampling obtains an electrical parameter of the second side of the power conversion device, including:
sampling to obtain a first voltage value and a first current value of a second side of the power conversion device;
said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
sampling to obtain an actual voltage value of the battery at a first side of the power conversion device;
determining a first actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, the first current value and the first voltage value;
determining a second actual current value of the battery according to the mapping relation between the first current value of the second side and the battery current;
and determining the actual current value of the battery according to the first actual current value and the second actual current value.
Optionally, determining the actual current value of the battery according to the first actual current value and the second actual current value includes:
and taking the average value of the first actual current value and the second actual current value as the actual current value of the battery.
According to another aspect of the invention, there is provided a power conversion device, a first side of which is connected to a battery, and a second side of which is selectively connected to a grid or a load; the power conversion device includes:
an acquisition unit configured to acquire an electrical parameter of a second side of the power conversion device;
a control unit configured to determine an actual current value of the battery based at least on an electrical parameter of the second side, and to adjust operation of the power conversion device based on the actual current value, wherein the actual current value comprises an actual charge current value or an actual discharge current value.
According to another aspect of the present invention, there is provided a power supply system including a battery and the power conversion apparatus according to any one of the embodiments of the present invention;
a first side of the power conversion device is connected with the battery;
the second side of the power conversion device is connected with a power grid and is used for charging the battery by alternating current input power of the power grid;
alternatively, the second side of the power conversion device is connected to a load for converting the dc input power of the battery to ac power for powering the load.
According to the technical scheme, the actual current value of the battery at the first side of the power conversion device can be determined and obtained at least according to the electric parameters at the second side of the power conversion device by collecting the electric parameters at the second side of the power conversion device, so that the current value of the battery is not required to be collected by the current collection device, the actual current value of the battery is convenient to determine, the hardware cost is reduced, the accuracy of determining the actual current value of the battery can be improved, and meanwhile, the operation of the power conversion device is adjusted based on the determined actual current value, so that the working state of the power conversion device is consistent with the expected state.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a control method of a power conversion device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method of a power conversion device according to another embodiment of the present invention;
FIG. 3 is a flowchart of a control method of a power conversion device according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a current mapping curve according to an embodiment of the present invention;
FIG. 5 is a flowchart of a control method of a power conversion device according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a power conversion device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power supply system according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a power supply system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. It will be further understood that, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. Furthermore, the terms "or," "and/or," "including at least one of," and the like, as used herein, are to be construed as inclusive, or mean any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various parameters or modules, these parameters or modules should not be limited by these terms. These terms are only used to distinguish one parameter or module from another of the same type. For example, a first parameter may also be referred to as a second parameter, and similarly, a second parameter may also be referred to as a first parameter, without departing from the scope herein. The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context. Furthermore, components, features, and elements that are identically named in different embodiments of the present application may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or further in connection with the context of this particular embodiment.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the claims.
The power conversion device may convert the input electrical energy into another form of electrical energy output to meet specific electrical demands. The power conversion device may be a direct current to direct current converter, or an alternating current to direct current converter. The power conversion device may also be a bidirectional power conversion device, i.e. the first side of the power conversion device is the input side and the second side is the output side; or the second side of the power conversion device is the input side and the first side is the output side. The first side of the power conversion device is connected to a battery and the second side of the power conversion device is selectively connected to a grid or a load. When the second side of the power conversion device is connected with the power grid, the high-voltage alternating-current power of the power grid can be converted into low-voltage direct-current power to be output to the battery, and the battery is charged. When the second side of the power conversion device is connected with the load, the low-voltage direct-current power of the battery can be converted into high-voltage alternating-current power to supply power for the load. Therefore, in general, the first side of the power conversion device connected to the battery is the low-voltage side, and the second side of the power conversion device is the high-voltage side. When the power conversion device is used for charging or discharging the battery, the current on the first side of the power conversion device is larger, and when the current of the battery (the current on the first side of the power conversion device) is collected through the current sensor or the collection circuit, a larger collection range is required, so that the cost of the current sensor or the signal sampling circuit is higher, and the charging and discharging current of the battery is difficult to accurately obtain. For example, taking a 3KW power conversion device as an example, when it is connected to a 12V battery and inverts and outputs 220V ac, the current on the low voltage side will be up to 250A, and with the change of the power consumption, the current on the low voltage side may vary from tens of amperes to hundreds of amperes, which obviously puts very high demands on the current sampling device of the hardware, and often requires high cost to configure a high-end current sensor to achieve accurate current sampling.
In view of the above technical problems, the present embodiment provides a control method of a power conversion device. Fig. 1 is a flowchart of a control method of a power conversion apparatus according to an embodiment of the present invention, where the control method may be performed by a control unit, and the control unit includes at least one of a digital signal processor (digital signal processing, DSP), a complex programmable logic device (complex programmable logicdevice, CPLD), a field programmable gate array (field programmable gate array, FPGA), a central processing unit (central processing unit, CPU), or a micro control unit (microcontroller unit, MCU), for example. As shown in fig. 1, the method includes:
step S110, sampling and acquiring an electrical parameter of a second side of the power conversion device.
The electric parameter is a parameter related to the electric power input or output by the power conversion device at the second side, and may be at least one of a voltage value, a current value and a power value.
In particular, since the voltage on the second side of the power conversion device is higher, the current on the second side will be significantly smaller than the current on the first side in case the output power of the power conversion device is constant, a lower specification current sensor may be used to collect the current value on the second side of the power conversion device. For example, the current value of the second side of the power conversion device may be collected by a current sensor, a current meter, a current transformer, a current collection circuit, or the like, and the voltage value of the second side of the power conversion device may be collected by a voltage sensor, a voltage transformer, a voltage meter, a voltage collection circuit, or the like. By collecting the voltage value and the current value of the second side of the power conversion device, the power value of the second side of the power conversion device may be determined. In other embodiments, the voltage value, the current value, and the power value of the second side of the power conversion device may also be collected by the power device.
Step S120, determining an actual current value of the battery according to at least the electrical parameter of the second side, wherein the actual current value includes an actual charging current value or an actual discharging current value.
Specifically, the electrical parameter of the second side of the power conversion device has a correlation with the electrical parameter of the first side, for example, the larger the current of the second side, the larger the current of the first side, within a certain range. The electrical parameter of the first side, i.e. the electrical parameter of the battery, can be determined according to the electrical parameter of the second side and the association relation between the electrical parameter of the second side and the electrical parameter of the first side, so as to determine the actual current value of the battery. When the load is connected to the second side of the power conversion device, the battery is discharged, and the actual current value of the battery is the actual discharge current value. When the second side of the power conversion device is connected to the power grid, the battery is charged with ac power from the power grid, and the actual current value of the battery is the actual charging current value. Therefore, the actual current value of the battery is not required to be acquired by adopting a high-cost current sensor, the measuring range of current acquisition is not required to be considered, the accuracy of current acquisition cannot be reduced due to the problem of the measuring range, the accuracy of battery current acquisition is improved, and the actual current of the battery is conveniently determined.
Step S130, adjusting the operation of the power conversion device based on the actual current value.
Specifically, when the battery is charged or discharged, the battery is generally charged or discharged according to a target current value, and the target current value may be a preset fixed value or a value input by a user. The control unit adjusts the operation of the power conversion device according to the target current value and the actual current value so that the charge current value or the discharge current value of the battery follows the target current value to be output so that the current value of the battery is equal to or close to the target current value. When the absolute value of the difference between the actual current value and the target current value is larger, for example, when the absolute value is larger than a preset threshold, the difference between the actual current value and the target current value is larger, the control unit adjusts the operation of the power conversion device, for example, adjusts the pulse width or frequency of a PWM driving signal output to a power switch tube in the power conversion device, and adjusts the output of the power conversion device, so that the current value of the battery is adjusted, the battery is operated according to the target current value, that is, the battery is operated according to an expected state, and the working states of the battery and the power conversion device are consistent with the expected state, so that different charge and discharge requirements are met.
According to the technical scheme, the actual current value of the battery at the first side of the power conversion device can be determined at least according to the electric parameters of the second side of the power conversion device by collecting the electric parameters of the second side of the power conversion device, so that the current value of the battery is not required to be collected by the current collection device, the actual current value of the battery is convenient to determine, the hardware cost is reduced, the accuracy of determining the actual current value of the battery can be improved, and meanwhile, the operation of the power conversion device is adjusted based on the determined actual current value, so that the working state of the power conversion device is consistent with the expected state.
In addition to the above-mentioned aspects, in step S120, there may be various ways of determining the actual current value of the battery based on at least the electrical parameter of the second side, and the control method of the power conversion device will be further described below with reference to the specific manner of determining the actual current value of the battery, but this is not a limitation of the present application.
In one implementation, fig. 2 is a flowchart of a control method of another power conversion device according to an embodiment of the present invention, optionally, referring to fig. 2, the control method of the power conversion device includes:
Step S210, sampling and obtaining a first voltage value and a first current value of a second side of the power conversion device.
Specifically, by acquiring the first voltage value and the first current value of the second side of the power conversion device, it is facilitated to determine the current value of the corresponding first side of the power conversion device, i.e. to determine the actual current value of the battery, from the first voltage value and the first current value.
When the power conversion device is operated in the inverted output mode, the battery discharges the load through the power conversion device at this time, and the output power of the power conversion device at this time can be determined by sampling the voltage value and the current value of the second side of the power conversion device. Alternatively, when the power conversion device is operating in the rectified charging mode, the input power of the power conversion device at this time may be determined by sampling the voltage value and the current value of the second side of the power conversion device.
Step S220, sampling and obtaining an actual voltage value of the battery at the first side of the power conversion device.
In particular, the actual voltage value of the battery on the first side may be obtained, for example, by a voltmeter, a voltage sensor or a power device, facilitating the determination of the actual current value of the battery on the first side from the actual voltage value of the battery on the first side and the electrical parameter on the second side of the power conversion device.
Step S230, determining a first power value of the second side according to the first voltage value and the first current value.
Specifically, for example, a product of the first voltage value and the first current value is calculated, and the product is taken as the first power value. For example, the first voltage value is V 1 The first current value is I 1 First power value P 1 ＝V 1 *I 1 . According to the law of conservation of energy, the input power and the output power of the power conversion device are the same on the basis of not considering the efficiency of the power conversion device; the input power and the output power of the power conversion device also have a correspondence relationship in consideration of the efficiency of the power conversion device. In this way, according to the association relation between the first power value of the second side and the power value of the first side, the power value of the first side can be determined, and then the actual current value of the battery is determined according to the power value of the first side and the actual voltage value of the battery of the first side.
Step S240, determining an actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value.
Specifically, the conversion efficiency of the power conversion device is a ratio of output power to input power of the power conversion device, and is generally less than 1 due to self power consumption and conversion loss of the power conversion device. The conversion efficiency may be determined from the test results of the engineering prototype and stored in a memory of the control unit. The second power value of the battery can be determined according to the conversion efficiency and the first power value of the power conversion device, and the actual current value of the battery can be determined according to the second power value of the battery and the actual voltage value of the battery. Thus, the actual current value of the battery can be accurately calculated, and the sampling of the battery current is not required by using a hardware sensor. And the actual current value of the battery can be calculated in real time or periodically, so that the working state (charge and discharge state) of the battery can be conveniently obtained, and the operation of the power conversion device can be adjusted.
Step S250, adjusting the operation of the power conversion device based on the actual current value.
Specifically, the PI current regulator or the PID current regulator may be used to control and adjust the operation of the power conversion device, and the actual current value of the battery determined in step S240 is used as a feedback amount, and the reference current value is used as a reference amount to perform calculation, where the obtained output signal acts on the power conversion device, and the power conversion device regulates the operation state of the power conversion device so that the actual current value of the battery approaches the reference current value.
On the basis of the above technical solution, optionally, step S240 of determining the actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value includes:
and a1, determining a power range in which the first power value is located.
Specifically, the first power value of the first side of the power conversion device is an input power value of the power grid or a power consumption value of the load. The power of the power grid or the load fluctuates within a certain range, so that there are a minimum power value and a maximum power value of the work, the power value between the minimum power value and the maximum power value can be divided into a plurality of different power ranges (or power segments), and the power range in which the first power value is located can be determined by comparing the first power value with the boundary value of each power range. The efficiency of the power conversion means may be different in different power ranges, so that a power-efficiency curve may be formed from test data of the engineering prototype, and the full power is divided into different power ranges (or power segments) according to efficiency values, in each of which the power conversion means has the same or close conversion efficiency, and the data is stored in a memory of the control unit.
And a2, determining an actual current value of the battery according to the conversion efficiency of the power conversion device corresponding to the power range, the actual voltage value of the battery and the first power value.
Specifically, since different power ranges on the second side of the power conversion device correspond to different conversion efficiencies of the power conversion device, that is, each power range corresponds to one conversion efficiency, the conversion efficiency corresponding to the first power value may be determined according to the conversion efficiency map corresponding to the power range stored in advance. The second power value of the battery may be determined based on the conversion efficiency of the power conversion device and the first power value, the second power value of the battery being equal to a product of the conversion efficiency of the power conversion device and the first power value. The actual current value of the battery can be determined according to the second power value of the battery and the actual voltage value of the battery, and the actual current value of the battery is equal to the quotient of the second power value of the battery and the actual voltage value of the battery. Therefore, because the different charging (discharging) current ranges of the battery correspond to the power ranges of different power conversion devices, the different power ranges correspond to the different power ranges of power grid input (or power conversion device output), and the accurate estimation of the charging current (or discharging current) of the battery can be realized by dynamically adjusting the conversion efficiency in the different charging current ranges so as to meet different charging (or discharging) requirements.
Optionally, step S240, determining an actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value, includes:
step b1, determining a second power value of the first side of the power conversion device according to the conversion efficiency and the first power value.
Specifically, the conversion efficiency of the power conversion device is a ratio of the first power value to the second power value, and therefore, the second power value can be calculated according to the conversion efficiency and the first power value. For example, the first power value is P 1 The conversion efficiency of the power conversion device is k, and the second power value is P 2 ＝k*P 1 。
And b2, determining the actual current value of the battery according to the second power value and the actual voltage value of the battery.
Specifically, the second power value is the charging power or discharging power of the battery, and the ratio of the second power value to the actual voltage value of the battery is calculated, namely the actual current value of the battery. For example, the actual voltage of the battery is V 2 Actual current value of the battery
In another implementation manner, fig. 3 is a flowchart of a control method of a power conversion device according to another embodiment of the present invention, optionally, referring to fig. 3, the control method of the power conversion device includes:
Step S310, sampling and obtaining a second current value of a second side of the power conversion device.
Specifically, for example, a current sensor can be used to obtain a second current value of the second side of the power conversion device, the voltage of the second side of the power conversion device is larger, the current is smaller, and then a power device with a smaller range can be used to obtain the second current, so that the hardware cost is low, the problem of larger acquisition error caused by larger range is avoided, and the accuracy of determining the actual current value of the battery is improved.
The second current value on the second side of the power conversion device is the same as the first current value in the same operation state at the same time, and only a different designation is used for describing the determination manner of the actual current value of the different battery.
Step S320, determining the actual current value of the battery according to the mapping relation between the second current value of the second side and the battery current.
Specifically, as the current on the first side of the power conversion device changes, the current on the second side of the power conversion device also changes accordingly; along with the change of the current of the second side of the power conversion device, the current of the first side of the power conversion device also changes correspondingly, and the second current value of the second side of the power conversion device has a correlation relationship with the battery current, namely a mapping relationship exists. The actual current value of the battery can be determined according to the mapping relation and the second current value of the second side, for example, the second current value is substituted into the mapping relation, and the actual current value of the battery can be found.
For example, the map may be stored in a memory of the control unit in the form of a formula, a table, or a graph, or in a separate memory, and the control unit may find or calculate the actual current value of the battery by substituting the second current value into the map. The mapping relationship can be determined according to the test result of the engineering prototype in the product design stage, and the mapping relationship is stored in a memory of the control unit.
Step S330, adjusting the operation of the power conversion device based on the actual current value.
Optionally, the mapping between the second current value of the second side and the battery current is determined according to the following manner:
and f1, respectively sampling a first side current value and a second side current value of the power conversion device under test conditions.
Specifically, the test condition is, for example, that the actual voltage of the battery is constant (i.e., the actual voltage of the battery is substantially unchanged), and the charging power or the discharging power of the battery may be controlled within a preset power range, which is not limited in this embodiment. For example, the charging power (or discharging power) of the battery may be changed under the condition that the actual voltage of the battery is constant, and the first side current value and the second side current value of the power conversion device may be sampled multiple times to obtain multiple sets of current data.
And f2, fitting a mapping relation curve according to the first side current value and the second side current value.
Specifically, for example, a coordinate system is established, all the first side current values and the corresponding second side current values are placed in the coordinate system, and a mapping relation curve of the first side current values and the second side current values is fitted according to multiple groups of the first side current values and the second side current values. When the mapping relation curve is fitted, all current data can be fitted together to obtain one mapping relation curve, or the mapping relation curve can be fitted in a segmented mode to obtain a plurality of mapping relation curves. In some embodiments, when the mapping relation is one, the second current value of the second side of the power conversion device is substituted into the mapping relation, so that the actual current value of the battery can be determined. In this way, the speed at which the actual current value of the battery is determined can be increased. In some embodiments, when the mapping relationship curves are two, determining a current range of the second current value of the second side of the power conversion device, thereby determining a mapping relationship curve corresponding to the second current value of the second side of the power conversion device, and substituting the second current value into the corresponding mapping relationship curve to obtain the actual current value of the battery. Thus, the accuracy of determining the actual current value of the battery can be improved.
In addition, after the mapping relation curve is fitted, a mapping relation formula (formula) may be obtained according to the mapping relation curve, and when the actual current value of the battery is determined, the second current value may be substituted into the mapping relation formula, and the actual current value of the battery may be obtained by calculation.
Fig. 4 is a schematic diagram of a current mapping relationship curve provided in an embodiment of the present invention, where, as shown in fig. 4, an abscissa is a first side current value (a current value of a battery), an ordinate is a second side current value, a curve (1) is a graph of an actual first side current value and a second side current value, and a curve (2) is a fitted graph. The actual current value of the battery may be determined from the fitted graph and the second current value. Or determining a mapping relation between the first side current value and the second side current value according to the fitted curve, wherein the mapping relation corresponding to fig. 4 is y= -1.7e -7 *x 4 +4.7e -5 *x 3 -0.0037*x 2 +0.12x-0.14, where x is a first side current value (current value of the battery) and y is a second side current value. When the actual current value of the battery is determined, the actual current value of the battery can be calculated by substituting the sampled second current value into the mapping relation.
In yet another implementation manner, fig. 5 is a flowchart of a control method of another power conversion device according to an embodiment of the present invention, optionally, referring to fig. 5, the control method of the power conversion device includes:
Step S410, sampling and acquiring a first voltage value and a first current value of a second side of the power conversion device.
Step S420, sampling and obtaining an actual voltage value of the battery at the first side of the power conversion device.
Step S430, determining a first actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, the first current value and the first voltage value.
Step S440, determining a second actual current value of the battery according to the mapping relation between the first current value of the second side and the battery current.
Step S450, determining the actual current value of the battery according to the first actual current value and the second actual current value.
Specifically, the first actual current value is an actual current value of the battery determined according to an actual voltage value of the battery, a conversion efficiency of the power conversion device, the first current value, and the first voltage value, and the second actual current value is an actual current value of the battery determined according to a mapping relationship between the first current value on the second side and the battery current. And the actual current value of the battery is determined according to the first actual current value and the second actual current value which are determined in two ways, so that the accuracy of determining the actual current value of the battery is improved. For example, the determination of the actual current value of the battery from the first actual current value and the second actual current value may be calculating a weighted average of the first actual current value and the second actual current value, i.e. the first actual current value and the second actual current value may be multiplied by different weight values. The calculation of the arithmetic mean of the first actual current value and the second actual current value can improve the accuracy of calculating the actual current value of the battery and the calculation efficiency. The difference between the first actual current value and the second actual current value can be calculated, if the difference is smaller, the average value of the first actual current value and the second actual current value is taken, and if the difference is larger, the first actual current value and the second actual current value are calculated again, so that the accuracy of calculating the actual current value of the battery is improved.
Step S460, adjusting the operation of the power conversion device based on the actual current value.
On the basis of the above technical solution, optionally, determining the actual current value of the battery according to the first actual current value and the second actual current value includes:
the average value of the first actual current value and the second actual current value is taken as the actual current value of the battery.
Specifically, the average value of the first actual current value and the second actual current value is an arithmetic average value of the first actual current value and the second actual current value. By calculating the average value of the first actual current value and the second actual current value as the actual current value of the battery, the error between the method for determining the battery current according to the conversion efficiency and the method for determining the battery current according to the mapping relation can be reduced, and thus the accuracy of determining the actual current value of the battery can be improved. And moreover, more calculation time is not needed, and the efficiency of determining the actual current value of the battery is improved.
The embodiment also provides a power conversion device. Fig. 6 is a schematic structural diagram of a power conversion device according to an embodiment of the present invention. As shown in fig. 6, the apparatus includes: an acquisition unit 510 and a control unit 520; the acquisition unit 510 is configured to acquire an electrical parameter of the second side of the power conversion device; the control unit 520 is configured to determine an actual current value of the battery at least from the electrical parameter of the second side, wherein the actual current value comprises an actual charging current value or an actual discharging current value, and to adjust the operation of the power conversion device based on the actual current value.
The power conversion device provided by the embodiment of the invention can execute the control method of the power conversion device provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
The embodiment also provides a power supply system. Fig. 7 is a schematic structural view of a power supply system according to an embodiment of the present invention, and referring to fig. 7, the power supply system includes a battery 10 and a power conversion device 20 according to any of the above embodiments; a first side of the power conversion device 20 is connected to the battery 10; a second side of the power conversion device 20 is connected to a grid (not shown) for charging the battery 10 with ac input power of the grid; alternatively, the second side of the power conversion device 20 is connected to the load 30 for converting the dc input power of the battery 10 into ac power for supplying the load 30. Fig. 7 shows a case where the second side of the power conversion device 20 is connected to the load 30, but is not limited thereto.
Specifically, when the second side of the power conversion device 20 is connected to the power grid, the power grid transmits ac input power to the power conversion device 20, and the power conversion device 20 converts high-voltage ac input power of the power grid into low-voltage ac power to charge the battery 10. When the second side of the power conversion device 20 is connected to the load 30, the power conversion device 20 converts the low-voltage dc input power of the battery 10 into higher-voltage ac power to power the load 30. When the battery 10 is operated (charged or discharged), a target current value is set, and the power conversion device 20 adjusts the operation state of the power conversion device 20 according to the target current value and the actual current value so that the current of the battery 10 follows the target current value, that is, so that the battery 10 is operated in a desired state. By determining the actual current value of the battery according to the control method of the power conversion device of any of the above embodiments, the actual current value of the battery can be accurately determined, and the operating state of the power conversion device 20 can be adjusted based on the actual current value, so that the operating state of the power conversion device 20 can be accurately adjusted, which is beneficial to better operation of the power supply system.
As a further implementation manner of this embodiment, on the basis of the foregoing technical solution, fig. 8 is a schematic structural diagram of a power supply system provided by an embodiment of the present invention, optionally, as shown in fig. 8, the power conversion device 20 includes a first conversion unit 21 and a second conversion unit 22, where the first conversion unit 21 is connected to the battery 10, and is used for converting low-voltage dc power of the battery 10 into high-voltage dc bus voltage, or converting the high-voltage dc bus voltage into low-voltage dc power, and inputting the low-voltage dc power into the battery 10. The second conversion unit 22 is connected between the first conversion unit 21 and the power grid or the load 30, and is used for converting the ac power of the power grid into a high-voltage dc bus voltage, or converting the high-voltage dc bus voltage output by the first conversion unit 21 into ac power to supply power to the load 30.
Specifically, the collecting unit 510 of the power conversion device 20 is electrically connected to the second side (i.e. the power grid or the load end) of the power conversion device 20, the collecting unit 510 is electrically connected to the control unit 520, and the electrical parameters of the second side of the power conversion device 20 are collected and sent to the control unit 520; the acquisition unit 510 is also electrically connected to the dc bus of the power conversion device 20, for example, to the bus between the first conversion unit 21 and the second conversion unit 22, and the acquisition unit 510 may acquire an electrical parameter (e.g., at least one of a voltage value, a current value, and a power value) of the dc bus and send the electrical parameter to the control unit 520, such that the control unit 520 determines an actual current value on the battery 10 side at least from the electrical parameter on the second side of the power conversion device 20, and adjusts the operation of the power conversion device 20 based on the actual current value.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
In this application, the same or similar term concept, technical solution, and/or application scenario description will generally be described in detail only when first appearing, and when repeated later, for brevity, will not generally be repeated, and when understanding the content of the technical solution of the present application, etc., reference may be made to the previous related detailed description thereof for the same or similar term concept, technical solution, and/or application scenario description, etc., which are not described in detail later.
In this application, the descriptions of the embodiments are focused on, and the details or descriptions of one embodiment may be found in the related descriptions of other embodiments.
The technical features of the technical solutions of the present application may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the present application.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as above, comprising several instructions for causing a terminal device (which may be a consumer or a network device, etc.) to perform the method of each embodiment of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.

Claims (10)

1. A method of controlling a power conversion device, characterized in that a first side of the power conversion device is connected to a battery and a second side of the power conversion device is selectively connected to a grid or a load; the method comprises the following steps:
sampling to obtain an electrical parameter of a second side of the power conversion device;
determining an actual current value of the battery based at least on the electrical parameter of the second side, wherein the actual current value comprises an actual charge current value or an actual discharge current value;
and adjusting the operation of the power conversion device based on the actual current value.
2. The method of claim 1, wherein the sampling obtains an electrical parameter of a second side of the power conversion device, comprising:
sampling to obtain a first voltage value and a first current value of a second side of the power conversion device;
said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
Sampling to obtain an actual voltage value of the battery at a first side of the power conversion device;
determining a first power value of the second side according to the first voltage value and the first current value;
an actual current value of the battery is determined based on the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value.
3. The method of claim 2, wherein determining the actual current value of the battery based on the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value comprises:
determining a power range in which the first power value is located;
and determining an actual current value of the battery according to the conversion efficiency of the power conversion device corresponding to the power range, the actual voltage value of the battery and the first power value.
4. The method of claim 2, wherein determining the actual current value of the battery based on the actual voltage value of the battery, the conversion efficiency of the power conversion device, and the first power value comprises:
determining a second power value of a first side of the power conversion device according to the conversion efficiency and the first power value;
And determining an actual current value of the battery according to the second power value and the actual voltage value of the battery.
5. The method of claim 1, wherein the sampling obtains an electrical parameter of a second side of the power conversion device, comprising:
sampling to obtain a second current value of a second side of the power conversion device;
said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
and determining the actual current value of the battery according to the mapping relation between the second current value of the second side and the battery current.
6. The method of claim 5, wherein the second current value of the second side versus battery current mapping is determined according to:
respectively sampling a first side current value and a second side current value of the power conversion device under test conditions;
and fitting a mapping relation curve according to the first side current value and the second side current value.
7. The method of claim 1, wherein the sampling obtains an electrical parameter of a second side of the power conversion device, comprising:
sampling to obtain a first voltage value and a first current value of a second side of the power conversion device;
Said determining an actual current value of said battery based at least on an electrical parameter of said second side, comprising:
sampling to obtain an actual voltage value of the battery at a first side of the power conversion device;
determining a first actual current value of the battery according to the actual voltage value of the battery, the conversion efficiency of the power conversion device, the first current value and the first voltage value;
determining a second actual current value of the battery according to the mapping relation between the first current value of the second side and the battery current;
and determining the actual current value of the battery according to the first actual current value and the second actual current value.
8. The method of claim 7, wherein determining an actual current value of the battery from the first actual current value and the second actual current value comprises:
and taking the average value of the first actual current value and the second actual current value as the actual current value of the battery.
9. A power conversion device, wherein a first side of the power conversion device is connected to a battery and a second side of the power conversion device is selectively connected to a power grid or a load; the power conversion device includes:
An acquisition unit configured to acquire an electrical parameter of a second side of the power conversion device;
a control unit configured to determine an actual current value of the battery based at least on an electrical parameter of the second side, and to adjust operation of the power conversion device based on the actual current value, wherein the actual current value comprises an actual charge current value or an actual discharge current value.
10. A power supply system comprising a battery and the power conversion device according to claim 9;
a first side of the power conversion device is connected with the battery;
the second side of the power conversion device is connected with a power grid and is used for charging the battery by alternating current input power of the power grid;
alternatively, the second side of the power conversion device is connected to a load for converting the dc input power of the battery to ac power for powering the load.
CN202311338036.6A 2023-10-16 2023-10-16 Power conversion device, control method thereof and power supply system Pending CN117335526A (en)

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CN111262428A (en) * 2020-03-02 2020-06-09 长城汽车股份有限公司 Control method and device of DCDC converter
CN115036951A (en) * 2021-03-04 2022-09-09 华为数字能源技术有限公司 Energy storage system and battery management method
CN115714537A (en) * 2022-12-02 2023-02-24 苏州融硅新能源科技有限公司 Power converter, control method and power conversion system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111262428A (en) * 2020-03-02 2020-06-09 长城汽车股份有限公司 Control method and device of DCDC converter
CN115036951A (en) * 2021-03-04 2022-09-09 华为数字能源技术有限公司 Energy storage system and battery management method
CN116094013A (en) * 2022-03-02 2023-05-09 天容宝节能科技股份有限公司 Battery energy storage device
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