CN114070012A - Bus reverse filling prevention control method and device, control equipment and power supply system - Google Patents

Bus reverse filling prevention control method and device, control equipment and power supply system Download PDF

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Publication number
CN114070012A
CN114070012A CN202111265670.2A CN202111265670A CN114070012A CN 114070012 A CN114070012 A CN 114070012A CN 202111265670 A CN202111265670 A CN 202111265670A CN 114070012 A CN114070012 A CN 114070012A
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China
Prior art keywords
bus
voltage
target
power supply
output
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Pending
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CN202111265670.2A
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Chinese (zh)
Inventor
陈威龙
苏宁焕
陈同有
吕吉炜
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Kehua Data Co Ltd
Zhangzhou Kehua Electric Technology Co Ltd
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Kehua Data Co Ltd
Zhangzhou Kehua Electric Technology Co Ltd
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Priority to CN202111265670.2A priority Critical patent/CN114070012A/en
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    • 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
    • H02M1/00—Details of apparatus for conversion
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters

Abstract

The invention provides a control method, a control device, control equipment and a power supply system for preventing reverse filling of a bus. The method comprises the following steps: acquiring an electrical parameter of a target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules; judging whether the target bus generates voltage reverse irrigation according to the electrical parameters; when the voltage reverse irrigation of the target bus is judged, obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression; and performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules. The invention can improve the reliability of bus operation.

Description

Bus reverse filling prevention control method and device, control equipment and power supply system
Technical Field
The invention relates to the technical field of power supply control, in particular to a method, a device, control equipment and a power supply system for controlling reverse filling prevention of a bus.
Background
With the development of power supply technology, a plurality of buses are commonly connected in parallel to supply power to high-power electric equipment.
The parallel buses may have different output voltages due to their respective output characteristics. The output voltages of the parallel buses are different, and a bus backflow phenomenon may occur, that is, a bus with a high output voltage may flow voltage to a bus with a low output voltage. The long-time bus back-flow may damage the device and may further affect the normal power supply.
In the prior art, anti-reverse devices such as diodes are connected in series at the output end of each bus to prevent the reverse filling of the buses. However, taking the bus back-filling phenomenon of two parallel buses as an example, the problem that only a single bus is output and the normal output of the two parallel buses cannot be ensured by adopting a back-blocking prevention device such as a series diode exists, and the normal operation of the electric equipment is affected. Namely, the prior art is adopted to process the reverse flow of the parallel bus, and the normal work of the electric equipment can be possibly realized.
Disclosure of Invention
The embodiment of the invention provides a method, a device, control equipment and a power supply system for controlling reverse filling prevention of a bus, and aims to solve the problem that the normal work of a bus machine is possibly influenced by processing reverse filling prevention of a parallel bus in the prior art.
In a first aspect, an embodiment of the present invention provides a control method for preventing reverse filling of a bus, including:
acquiring an electrical parameter of a target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
judging whether the target bus generates voltage reverse irrigation according to the electrical parameters;
when the voltage reverse irrigation of the target bus is judged, obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression;
and performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules.
In one possible implementation, the electrical parameters include output voltage, output current, bus voltage, and bus given voltage; the predetermined voltage compensation relationship is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein, Delta U is a voltage compensation value, UoutTo output a voltage, IoutFor outputting current, Ubus_refFor bus given voltage, Ubus_fdbIs the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
In one possible implementation, the electrical parameters include an output voltage and an output current; judging whether the target bus generates voltage reverse irrigation according to the electrical parameters, comprising the following steps of:
calculating the output power of the target bus according to the output voltage and the output current;
and if the output power is smaller than the preset power value, judging that the voltage of the target bus flows backwards.
In one possible implementation, the electrical parameters include a bus voltage and a bus given voltage; judging whether the target bus generates voltage reverse irrigation according to the electrical parameters, comprising the following steps of:
and if the difference value obtained by subtracting the given voltage of the bus from the bus voltage is larger than the preset difference value, judging that the voltage of the target bus is reversely filled.
In one possible implementation manner, performing voltage compensation on the target bus according to the voltage compensation value includes:
superposing the voltage compensation value to an input parameter of an output voltage ring of the target bus to obtain an output value of the output voltage ring;
and generating a target PWM wave according to the output value, and controlling a target bus according to the target PWM wave.
In a second aspect, an embodiment of the present invention provides a bus bar reverse filling prevention control device, including:
the acquisition unit is used for acquiring the electrical parameters of the target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
the judging unit is used for judging whether the target bus generates voltage reverse irrigation according to the electrical parameters;
the calculation unit is used for obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression when the voltage reverse irrigation of the target bus is judged;
and the compensation unit is used for performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules.
In one possible implementation, the electrical parameters include output voltage, output current, bus voltage, and bus given voltage; the predetermined voltage compensation relationship is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein, Delta U is a voltage compensation value, UoutTo output a voltage, IoutFor outputting current, Ubus_refFor bus given voltage, Ubus_fdbIs the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
In a third aspect, an embodiment of the present invention provides a control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor, when executing the computer program, implements the steps of the bus bar reverse-flow prevention control method according to the first aspect or any one of the possible implementations of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a power supply system, including a plurality of parallel power supply modules and the control device of the above third aspect; the plurality of parallel power modules are controlled by the control equipment;
for each power supply module, the power supply module comprises an AC/DC unit and a DC/AC unit which are connected in sequence; a bus is arranged between the output end of the AC/DC unit and the input end of the DC/AC unit; the AC/DC unit and the DC/AC unit are both controlled by a control device.
In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the bus bar reverse-flow prevention control method according to the first aspect or any one of the possible implementations of the first aspect are implemented.
The embodiment of the invention provides a method, a device, control equipment and a power supply system for controlling reverse filling prevention of a bus, wherein the method comprises the steps of obtaining an electric parameter of a target bus; judging whether the target bus generates voltage reverse irrigation; when the voltage of the target bus bar reversely flows, the voltage compensation value is calculated, the voltage compensation is carried out on the target bus bar according to the voltage compensation value, the voltage reverse flow of the target bus bar is finally eliminated, the normal output of the target power supply module is ensured, the bus bar can be prevented from damaging related hardware devices due to the voltage reverse flow, the service life of the bus bar is prolonged, the normal output of each bus bar can be ensured, and the working reliability of the bus bar is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is an application scenario diagram provided in an embodiment of the present invention;
FIG. 2 is a flowchart of an implementation of a method for controlling reverse filling prevention of a bus according to an embodiment of the present invention;
FIG. 3 is a schematic loop diagram of an output voltage loop provided by an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a bus reverse-filling prevention control device provided by the embodiment of the invention;
fig. 5 is a schematic diagram of a control device provided in an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
The control method for preventing reverse filling of the buses, provided by the embodiment of the invention, is mainly applied to the condition that a plurality of buses are connected in parallel, and can be used for connecting direct current buses in parallel or connecting alternating current buses in parallel.
For example, for a power module machine, it includes a plurality of power modules connected in parallel. The structure of each power supply module is the same. For each power supply module, it may comprise one or more voltage converting units, which may comprise AC/DC units, AC/AC units, DC/DC units, DC/AC units. Depending on the number and kind of the included voltage units, the power supply module may have at least the following four configurations:
first, when the power module includes only an AC/DC unit or a DC/DC unit, the bus type of the power module is a direct current bus.
Second, when the power module includes only a DC/AC unit or an AC/AC unit, the bus type of the power module is an alternating current bus.
Thirdly, the power module comprises an AC/DC unit and a DC/AC unit which are connected in sequence, wherein a direct current bus of the power module is arranged between the output end of the AC/DC unit and the input end of the DC/AC unit.
Fourthly, the power supply module comprises a DC/AC unit and an AC/DC unit which are connected in sequence, wherein an alternating current bus of the power supply module is arranged between the output end of the DC/AC unit and the input end of the AC/DC unit.
For the rest of the combination cases, refer to the above cases, and are not described again.
According to at least the four situations, the embodiment of the invention is mainly applied to the situation that a plurality of buses are connected in parallel.
Referring to fig. 1, a diagram of an application scenario provided by an embodiment of the present invention is shown.
As shown in fig. 1, a power module machine may include N power modules connected in parallel to supply power to a consumer. The power supply module comprises a power supply module D1, a power supply module D2. The power module D1 includes an AC/DC unit P01 and a DC/AC unit Q01 connected in series, the power module D2 includes an AC/DC unit P02 and a DC/AC unit Q02 connected in series, and the power module Dn includes an AC/DC unit P0n and a DC/AC unit Q0n connected in series.
Taking the power module D1 as an example, a bus of the power module D1 is arranged between the output end of the AC/DC unit P01 and the input end of the DC/AC unit Q01, and the AC/DC unit P01 adopts a vienna topology or a Boost topology in many cases. The power module D1 also includes two voltage control loops, an input voltage loop and an output voltage loop. The input voltage loop is used to control the voltage of the AC/DC unit P01 and the output voltage loop is used to control the voltage of the DC/AC unit Q01. In addition, the output voltage of the DC/AC unit P01 is also the output voltage of the power module D1. The AC/DC unit P01 may also be referred to as a rectifying unit P01, and the DC/AC unit Q01 may also be referred to as an inverting unit Q01. The other power supply modules have the same structure.
Referring to fig. 1, the method according to the embodiment of the present invention may be described with reference to two parallel buses, taking the power module D1 and the power module D2 as an example, the power module D1 and the power module D2 may include only the AC/DC unit P01 and the AC/DC unit P02, respectively, where the bus of the power module D1 is connected in parallel with the bus of the power module D2. From the above, the embodiment of the invention can be applied to the case that a plurality of buses are connected in parallel.
Referring to fig. 2, an implementation flowchart of the bus reverse filling prevention control method provided by the embodiment of the invention is shown. As shown in fig. 2, a method for controlling reverse filling prevention of a bus may include:
s101, acquiring electrical parameters of a target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
optionally, a plurality of identical power modules are connected in parallel, each power module is provided with a corresponding bus, and the bus can be divided into a direct current bus or an alternating current bus according to different structures of the power modules.
The target bus is a bus in the target power module. In practical application, all the buses connected in parallel can be controlled simultaneously. The embodiment of the invention takes the target bus as an example for description, and the control processes of the rest buses are the same.
The electrical parameter of the target bus may be a real-time electrical parameter such as input voltage, input current, output voltage, output current, bus voltage, etc. The electrical parameter of the target busbar may also be a given electrical parameter of the input voltage ring, a given electrical parameter of the output voltage ring, such as a given electrical parameter of the input given voltage, a given voltage of the busbar, etc. The real-time electrical parameters can be acquired, and the given electrical parameters can be directly acquired.
S102, judging whether voltage reverse irrigation occurs to the target bus according to the electrical parameters;
optionally, whether voltage back-flow occurs to the target bus can be judged according to the real-time electrical parameter and the given electrical parameter.
For example, whether voltage back-flow of the target bus is possible can be judged by comparing the output voltage of the target bus with the output voltages of the rest buses. And whether the voltage of the target bus is reversely poured can be judged through other electrical parameters.
S103, when the voltage reverse irrigation of the target bus is judged, obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression;
optionally, when voltage back-flowing occurs to the target bus, it is indicated that the output voltage of the target bus is lower than the output voltages of the other buses, so that the output voltage of the target bus needs to be raised, and the voltage compensation value of the target bus can be calculated according to the electrical parameter and the predetermined voltage compensation relational expression. The predetermined voltage compensation relation can be used for calculating a voltage compensation value, and the voltage compensation value can represent a voltage value required to be increased by the output voltage of the target power supply module to a certain extent.
And S104, performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules.
Optionally, voltage compensation may be performed on the target bus in which voltage backflow occurs according to the voltage compensation value to raise the output voltage of the target power module, so that the output voltage of the target power module is the same as the output voltages of the other power modules. The same means that the output voltage of the target power module is identical to the output voltages of the other power modules. Or the difference value between the output voltage of the target power module and the output voltages of the other power modules is within a certain range, although the output voltage of the target power module is not equal to the output voltages of the other power modules, the buses of the other power modules do not flow back to the target bus voltage of the target power module, and the target buses of the target power module do not flow back to the bus voltages of the other power modules. That is, the output voltage of the target power supply module may fluctuate within a certain range.
According to the embodiment of the invention, the electrical parameters of the target bus are obtained; judging whether the target bus generates voltage reverse irrigation; when the voltage of the target bus bar flows backward, the voltage compensation value is calculated, voltage compensation is carried out on the target bus bar according to the voltage compensation value, the voltage backward flow of the target bus bar is finally eliminated, normal output of a target power supply module is guaranteed, damage to related hardware devices due to voltage backward flow of the bus bar can be avoided, the service life of the bus bar is prolonged, and meanwhile the working reliability of the bus bar can be improved.
In some embodiments of the invention, the electrical parameters include output voltage, output current, bus voltage, and bus given voltage; the predetermined voltage compensation relationship is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein, Delta U is a voltage compensation value, UoutTo output a voltage, IoutFor outputting current, Ubus_refFor bus given voltage, Ubus_fdbIs the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
Optionally, UoutAnd IoutThe product of the voltage and the current is the output power of the target bus, when the voltage of the target bus flows backward, the output voltage and the output current of the target bus are reversed, namely the output power of the target bus is a negative value. And the bus voltage of the target bus is greater than the bus given voltage. First coefficient K1Can be dynamically adjusted according to the output power, and the second coefficient K2The dynamic adjustment can be carried out according to the difference value of the bus voltage and the given bus voltage. I.e. the first coefficient K1And a second coefficient K2Is obtained by adjustment according to actual experience.
For example, the adjustment of the target bus bar may be as follows:
Figure BDA0003326877920000081
for example: when the voltage of the target bus is reversely poured, the output power of the target bus is-0.2 kW, the absolute value is taken and then is 0.2kW, the difference value between the bus voltage and the given voltage of the bus is 5V, and the voltage compensation value obtained through calculation of the voltage compensation relational expression is 0.2V.
For another example: when the voltage of the target bus is reversely poured, the output power of the target bus is-0.6 kW, the absolute value is taken and then is 0.6kW, the difference value between the bus voltage and the given voltage of the bus is 10V, and the voltage compensation value obtained through calculation of the voltage compensation relational expression is 0.7V.
The voltage compensation value in each case can be obtained by means of a table look-up.
In some embodiments of the invention, the electrical parameters include output voltage and output current; judging whether the target bus generates voltage reverse irrigation according to the electrical parameters, comprising the following steps of:
calculating the output power of the target bus according to the output voltage and the output current;
and if the output power is smaller than the preset power value, judging that the voltage of the target bus flows backwards.
Optionally, if the output power is greater than the preset power value, it is determined that voltage backflow does not occur in the target bus.
The preset power value can be set according to actual conditions, for example, the preset power value is zero. And when the output power of the target bus is less than zero, judging that the voltage of the target bus flows backwards. And when the output power of the target bus is greater than zero, judging that the voltage of the target bus is not reversely poured.
In some embodiments of the invention, the electrical parameters include bus voltage and bus given voltage; judging whether the target bus generates voltage reverse irrigation according to the electrical parameters, comprising the following steps of:
and if the difference value obtained by subtracting the given voltage of the bus from the bus voltage is larger than the preset difference value, judging that the voltage of the target bus is reversely filled.
Optionally, if the difference obtained by subtracting the given voltage of the bus from the bus voltage is less than or equal to the preset difference, it is determined that the voltage backflow does not occur to the target bus.
When the voltage of the target bus bar is inversely filled, the bus voltage of the target bus bar can be increased, and therefore whether the voltage of the target bus bar is inversely filled or not can be judged when the difference value between the voltage of the bus bar and the given voltage of the bus bar is larger than the preset difference value. The preset difference value may be set according to actual needs, for example, the preset difference value may be zero.
In some embodiments of the present invention, the voltage compensation of the target bus according to the voltage compensation value includes:
superposing the voltage compensation value to an input parameter of an output voltage ring of the target bus to obtain an output value of the output voltage ring;
and generating a target PWM wave according to the output value, and controlling a target bus according to the target PWM wave.
Referring to fig. 3, a schematic loop diagram of an output voltage loop provided by an embodiment of the present invention is shown. In FIG. 3, UpeakRepresenting the peak value of the output voltage of the target bus, delta U is the voltage compensation value, sin theta is the sine component of the peak value of the output voltage, IoutFor the output current, Uinv is the output voltage of the DC/AC unit of the target bus (i.e. the output voltage U of the target bus)outThe same as each other), UbusThe modulation is the modulation for the bus voltage.
The voltage compensation value is superposed on the input parameter of the output voltage ring, the target PWM wave is obtained through calculation of the output voltage ring, the target bus is controlled by the target PWM wave, the output voltage is raised, so that the output voltage of the target bus is the same as the output voltage of the rest buses, and the condition that the voltage cannot be reversely poured is ensured.
The embodiment of the invention has the following beneficial effects: the voltage reverse-flow can be avoided when a plurality of parallel buses are connected, the overvoltage protection is triggered by the surface bus device, the normal power supply to the electric equipment is guaranteed, the service life of the buses is prolonged, and the working reliability of the buses is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 4 shows a schematic structural diagram of a bus bar reverse filling prevention control device provided by the embodiment of the invention, and for convenience of description, only the parts related to the embodiment of the invention are shown, and the details are as follows:
as shown in fig. 4, the bus bar reverse filling prevention control device 20 may include:
an obtaining unit 201, configured to obtain an electrical parameter of a target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
the judging unit 202 is used for judging whether voltage backflow occurs to the target bus according to the electrical parameters;
the calculating unit 203 is used for obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression when the voltage reverse irrigation of the target bus is judged;
and the compensation unit 204 is configured to perform voltage compensation on the target bus according to the voltage compensation value, so that the output voltage of the target power supply module is the same as the output voltages of the other power supply modules.
In some embodiments of the invention, the electrical parameters include output voltage, output current, bus voltage, and bus given voltage; the predetermined voltage compensation relationship is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein, Delta U is a voltage compensation value, UoutTo output a voltage, IoutFor outputting current, Ubus_refFor bus given voltage, Ubus_fdbIs the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
In some embodiments of the invention, the electrical parameters include output voltage and output current; the determining unit 202 may include:
the calculating subunit is used for calculating the output power of the target bus according to the output voltage and the output current;
and the first judgment subunit is used for judging that the voltage of the target bus is reversely filled if the output power is smaller than the preset power value.
In some embodiments of the invention, the electrical parameters include bus voltage and bus given voltage; the determining unit 202 may further include:
and the second judgment subunit is used for judging that the voltage of the target bus is reversely filled if the difference value obtained by subtracting the given voltage of the bus from the bus voltage is greater than the preset difference value.
In some embodiments of the present invention, the compensation unit 204 may include:
the superposition subunit is used for superposing the voltage compensation value on an input parameter of an output voltage ring of the target bus to obtain an output value of the output voltage ring;
and the generating subunit is used for generating a target PWM wave according to the output value and controlling the target bus according to the target PWM wave.
Fig. 5 is a schematic diagram of a control device provided in an embodiment of the present invention. As shown in fig. 5, the control device 30 of this embodiment includes: a processor 300, a memory 301, and a computer program 302 stored in the memory 301 and executable on the processor 300. The processor 300 executes the computer program 302 to implement the steps in the above-mentioned embodiments of the bus bar reverse-flow prevention control method, such as S101 to S104 shown in fig. 2. Alternatively, the processor 300, when executing the computer program 302, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the units 201 to 204 shown in fig. 4.
Illustratively, the computer program 302 may be partitioned into one or more modules/units, which are stored in the memory 301 and executed by the processor 300 to implement the present invention. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 302 in the control device 30. For example, the computer program 302 may be divided into the units 201 to 204 shown in fig. 4.
The control device 30 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The control device 30 may include, but is not limited to, a processor 300, a memory 301. Those skilled in the art will appreciate that fig. 5 is merely an example of a control device 30, and does not constitute a limitation of the control device 30, and may include more or fewer components than shown, or some components in combination, or different components, e.g., the control device may also include input-output devices, network access devices, buses, etc.
The Processor 300 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 301 may be an internal storage unit of the control device 30, such as a hard disk or a memory of the control device 30. The memory 301 may also be an external storage device of the control device 30, such as a plug-in hard disk provided on the control device 30, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 301 may also include both an internal storage unit of the control device 30 and an external storage device. The memory 301 is used to store computer programs and other programs and data needed to control the device. The memory 301 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The embodiment of the present invention further provides a power supply system, which includes a plurality of parallel buses and the above control device 30; a plurality of parallel power modules are all controlled by the control device 30;
for each power supply module, the power supply module comprises an AC/DC unit and a DC/AC unit which are connected in sequence; a bus is arranged between the output end of the AC/DC unit and the input end of the DC/AC unit; both the AC/DC unit and the DC/AC unit are controlled by the control device 30.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/control device and method may be implemented in other ways. For example, the above-described apparatus/control device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by instructing relevant hardware through a computer program, where the computer program may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the bus bar reverse-flow prevention control method may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A bus reverse filling prevention control method is characterized by comprising the following steps:
acquiring an electrical parameter of a target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
judging whether the target bus generates voltage reverse irrigation according to the electrical parameters;
when the voltage reverse irrigation of the target bus is judged, obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression;
and performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules.
2. The bus bar reverse filling prevention control method according to claim 1, wherein the electrical parameters include an output voltage, an output current, a bus voltage, and a bus given voltage; the predetermined voltage compensation relation is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein Δ U is the voltage compensation value, UoutFor the output voltage, IoutFor the output current, Ubus_refFor a given voltage of the bus, Ubus_fdbTo the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
3. The bus bar reverse filling prevention control method according to claim 1, wherein the electrical parameters include an output voltage and an output current; the judging whether the target bus generates voltage reverse irrigation according to the electrical parameters comprises the following steps:
calculating the output power of the target bus according to the output voltage and the output current;
and if the output power is smaller than a preset power value, judging that the voltage of the target bus flows backwards.
4. The bus bar reverse filling prevention control method according to claim 1, wherein the electrical parameters include a bus bar voltage and a bus bar given voltage; the judging whether the target bus generates voltage reverse irrigation according to the electrical parameters comprises the following steps:
and if the difference value obtained by subtracting the given voltage of the bus from the bus voltage is greater than a preset difference value, judging that the voltage of the target bus is reversely filled.
5. The bus bar reverse filling prevention control method according to any one of claims 1 to 4, wherein the voltage compensation of the target bus bar according to the voltage compensation value comprises:
superposing the voltage compensation value to an input parameter of an output voltage ring of the target bus to obtain an output value of the output voltage ring;
and generating a target PWM wave according to the output value, and controlling the target bus according to the target PWM wave.
6. A bus bar reverse filling prevention control device is characterized by comprising:
the acquisition unit is used for acquiring the electrical parameters of the target bus; the target bus is a bus in the target power supply module; the target power supply module is one of a plurality of parallel power supply modules;
the judging unit is used for judging whether the target bus generates voltage reverse irrigation according to the electrical parameters;
the calculation unit is used for obtaining a voltage compensation value of the target bus according to the electrical parameter and a predetermined voltage compensation relational expression when the voltage reverse irrigation of the target bus is judged;
and the compensation unit is used for performing voltage compensation on the target bus according to the voltage compensation value so as to enable the output voltage of the target power supply module to be the same as the output voltage of the other power supply modules.
7. The bus anti-backflow control device according to claim 6, wherein the electrical parameters include output voltage, output current, bus voltage, and bus given voltage; the predetermined voltage compensation relation is:
ΔU＝K1*|Uout*Iout|+K2*|Ubus_ref-Ubus_fdb|
wherein Δ U is the voltage compensation value, UoutFor the output voltage, IoutFor the output current, Ubus_refFor a given voltage of the bus, Ubus_fdbTo the bus voltage, K1Is a first coefficient, K2Is a second coefficient; wherein, K1、K2Are all greater than zero.
8. A control apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the bus bar reverse-filling prevention control method according to any one of claims 1 to 5 when executing the computer program.
9. A power supply system comprising a plurality of parallel connected power supply modules and the control device of claim 8; the plurality of parallel power modules are all controlled by the control equipment;
for each power supply module, the power supply module comprises an AC/DC unit and a DC/AC unit which are connected in sequence; wherein a bus is arranged between the output end of the AC/DC unit and the input end of the DC/AC unit; the AC/DC unit and the DC/AC unit are both controlled by the control device.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the bus bar reverse-filling prevention control method according to any one of claims 1 to 5.
CN202111265670.2A 2021-10-28 2021-10-28 Bus reverse filling prevention control method and device, control equipment and power supply system Pending CN114070012A (en)

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