CN113178871A - Power supply voltage stabilizing method and device for mains supply flash interruption and direct-current power supply - Google Patents
Power supply voltage stabilizing method and device for mains supply flash interruption and direct-current power supply Download PDFInfo
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- CN113178871A CN113178871A CN202110476373.6A CN202110476373A CN113178871A CN 113178871 A CN113178871 A CN 113178871A CN 202110476373 A CN202110476373 A CN 202110476373A CN 113178871 A CN113178871 A CN 113178871A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The invention is suitable for the technical field of power supplies, and provides a power supply voltage stabilizing method and device aiming at commercial power flash-off and a direct-current power supply, wherein the method comprises the following steps: acquiring mains voltage input into the AC/DC module; if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed; and during the mains supply flash, increasing the proportional parameter of a PID (proportion integration differentiation) controller in a control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash. This application can avoid the problem of commercial power flash stage voltage sudden drop through above-mentioned scheme, reduces output voltage drop value through increase proportion parameter to guarantee the stability of mains output voltage during commercial power flash.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a power supply voltage stabilizing method and device aiming at commercial power flash-off and a direct-current power supply.
Background
Along with the continuous development of electric power and electronic equipment, people also have higher and higher power supply quality requirements for power supply equipment, and for some components and parts such as a PLC (programmable logic controller), a controller and the like which have higher requirements for voltage quality, stable output electric energy of the power supply equipment is needed, and if the mains supply is unstable, the situation of flash-off occurs, voltage mutation is caused, and the safety and stability of the whole system can be influenced.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power supply voltage stabilizing method and apparatus for mains supply flash interruption, and a dc power supply, so as to solve the problem of unstable voltage caused by mains supply flash interruption in the prior art.
The first aspect of the embodiment of the invention provides a power supply voltage stabilizing method aiming at commercial power flash, which is applied to power supply equipment, wherein the power supply equipment comprises an AC/DC module and a current transformation module, and the output end of the AC/DC module is connected with the input end of the current transformation module;
the method comprises the following steps:
acquiring mains voltage input into the AC/DC module;
if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed;
and during the mains supply flash, increasing the proportional parameter of a PID (proportion integration differentiation) controller in a control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash.
The second aspect of the embodiment of the invention provides a power supply voltage stabilizing device for mains supply flash interruption, which is applied to power supply equipment, wherein the power supply equipment comprises an AC/DC module and a current transformation module, and the output end of the AC/DC module is connected with the input end of the current transformation module;
the device includes:
the mains supply voltage acquisition module is used for acquiring mains supply voltage input into the AC/DC module;
the commercial power flash-off judging module is used for judging commercial power flash-off if the duration time that the commercial power voltage is less than the preset voltage value reaches a first preset time;
the first voltage stabilizing module is used for increasing the proportional parameter of a PID controller in a control loop of the converter module during mains supply flash so as to reduce the output voltage drop value of the converter module during mains supply flash.
A third aspect of embodiments of the present invention provides a dc power supply, including 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 power supply voltage stabilization method for mains supply flash interruption as described above when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the power supply voltage stabilization method for mains flicker as described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the power supply voltage stabilizing method provided by the embodiment firstly obtains the mains voltage input into the AC/DC module; if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed; and then, during the mains supply flash interruption, increasing the proportional parameter of the PID controller in the control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash interruption. The problem that commercial power flash-off stage voltage suddenly drops can be avoided through above-mentioned scheme to this embodiment, reduces output voltage drop value through increase proportion parameter to guarantee the stability of mains output voltage during commercial power flash-off.
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 a schematic flow chart of a power supply voltage stabilization method for mains supply flash interruption according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power supply apparatus provided by an embodiment of the invention;
fig. 3 is a schematic diagram of a power supply voltage stabilizing device for commercial power flash-off according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a dc power supply according to an embodiment of the 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 explain the technical means of the present invention, the following description will be given by way of specific examples.
In an embodiment, as shown in fig. 1, fig. 1 shows a flow of a power supply voltage stabilizing method for mains supply flash interruption, where the method is applied to a power supply device, and a specific implementation flow of the method includes:
s101: and acquiring the mains voltage input into the AC/DC module.
In this embodiment, as shown in fig. 2, fig. 2 shows a structure of a power supply device provided by an embodiment of the present invention, which includes: the AC/DC converter comprises an AC/DC module and a current transformation module, wherein the output end of the AC/DC module is connected with the input end of the current transformation module. The power supply equipment can be direct current power supply equipment or alternating current power supply equipment, when the power supply equipment is direct current power supply equipment, the current transformation module is a DC/DC module, and when the power supply equipment is alternating current power supply equipment, the current transformation module is a DC/AC module.
S102: and if the duration time of the mains voltage Ud which is less than the preset voltage value reaches a first preset time, judging that the mains is flashed.
In this embodiment, the preset voltage value may be 220V, and when the commercial power voltage is less than 220V and lasts for a certain time, it is determined that the commercial power is flashed. If the phase voltage is used as a monitoring value, the preset voltage value of each phase voltage can be 90V, and if the phase voltages of the three-phase power are all smaller than 90V and the duration time of the phase voltages smaller than 90V reaches a first preset time, the commercial power is judged to be flashed off.
Specifically, the first preset time is 1 ms.
S103: and during the mains supply flash, increasing the proportional parameter of a PID (proportion integration differentiation) controller in a control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash.
In this embodiment, in order to ensure that the output voltage of the power supply device does not drop during the mains supply flash, the energy required by the rear-end mains supply flash period is provided by the bus capacitor of the power supply device by the method of adjusting the proportional parameter of the control loop PID of the converter module.
In this embodiment, the duration of the mains supply flash is 10ms at most, and when the mains supply flash exceeds 10ms, the mains supply is considered to be powered off, and a battery device can be used for supplying power to the load. The method provided by the embodiment can ensure that the output voltage does not drop during the mains supply flash-off period, reduce frequent switching actions of the battery caused by transient sudden drop of the output voltage due to the mains supply flash-off, and ensure safe and stable operation of the system.
As can be seen from the foregoing embodiments, the power supply voltage stabilizing method provided in this embodiment first obtains the mains voltage input to the AC/DC module; if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed; and then, during the mains supply flash interruption, increasing the proportional parameter of the PID controller in the control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash interruption. The problem that commercial power flash-off stage voltage suddenly drops can be avoided through above-mentioned scheme to this embodiment, reduces output voltage drop value through increase proportion parameter to guarantee the stability of mains output voltage during commercial power flash-off.
In one embodiment, a bus is connected between the positive electrode and the negative electrode of the output end of the AC/DC moduleLine capacitance, and the bus capacitance satisfies
Wherein C represents a bus capacitance value, UoRepresenting the output voltage of said converter module, IoRepresenting the output current of said converter module, t representing a predetermined time, auoRepresenting the variation of the output voltage within the preset time t.
In this embodiment, the bus capacitance needs to meet the above conditions in order to provide the back end with sufficient energy required during mains flash.
In an embodiment, after S102, the method provided in this embodiment further includes:
and clearing the integral of the PID controller in the control loop of the variable flow module.
In this embodiment, in order to avoid the sudden increase of the output voltage at the moment of the commercial power restoration caused by the excessive integral accumulation during the commercial power flash, after the commercial power flash is determined, the integral of the PID controller in the control loop of the current conversion module is cleared.
In one embodiment, the method provided in this embodiment further includes:
s201: and if the commercial power is flashed off, the duration time that the commercial power voltage is greater than the preset voltage value reaches a second preset time, judging that the commercial power is recovered, and carrying out amplitude limiting treatment on the current loop set value of the current converting module after the commercial power is recovered.
In this embodiment, after the commercial power is flashed off, the three-phase voltages Ua, Ub, and Uc all rise to greater than 90V and last for a second preset time, and it is determined that the commercial power is restored.
Specifically, the second preset time may be set to one switching period, i.e., 41.66 us.
In order to avoid the instant output voltage overshoot of the commercial power recovery, in this embodiment, when the commercial power recovery is determined, the current loop set current of the converter module is limited, so as to reduce the duty ratio of the converter module, thereby achieving the effect of reducing the output voltage overshoot value.
In an embodiment, the specific implementation flow of S201 includes:
and in a preset switching period after the mains supply is recovered, linearly increasing the current loop set value of the current conversion module from the first current set value to a preset current loop set value.
In this embodiment, after the utility power is restored, the current set value of the converter module may be first reduced to the first current set value, and then, in a plurality of subsequent switching cycles, the current set value is linearly increased from the first current set value to the preset current loop set value, so that the duty ratio of the converter module is slowly increased, and the current set value is linearly restored to the control level of the original converter module.
Specifically, the first current set value may be 0 or 30A, and the preset current loop set value may be 60A. The total time during which the current set point increases linearly may be 20 ms.
According to the embodiment, the risk that the switch tube is damaged due to sudden increase of the output voltage at the moment of recovery of commercial power flash-off can be effectively avoided, and safe and stable operation of power supply equipment is guaranteed.
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.
In an embodiment, as shown in fig. 3, fig. 3 shows a structure of a power supply voltage stabilizing device 100 for mains supply flash interruption provided by this embodiment, which is applied to a power supply device, where the power supply device includes an AC/DC module and a current transformation module, and an output end of the AC/DC module is connected to an input end of the current transformation module;
the device includes:
a mains voltage obtaining module 110, configured to obtain a mains voltage input to the AC/DC module;
the commercial power flash determining module 120 is configured to determine that commercial power is flashed if the duration that the commercial power voltage is less than the preset voltage value reaches a first preset time;
the first voltage stabilizing module 130 is configured to increase a proportional parameter of a PID controller in a control loop of the converter module during a mains supply glitch, so as to reduce an output voltage drop value of the converter module during the mains supply glitch.
In one embodiment, a bus capacitor is connected between the positive electrode and the negative electrode of the output end of the AC/DC module, and the bus capacitor meets the requirement
Wherein C represents a bus capacitance value, UoRepresenting the output voltage of said converter module, IoRepresenting the output current of said converter module, t representing a predetermined time, auoRepresenting the variation of the output voltage within the preset time t.
In one embodiment, the power stabilizing apparatus 100 for mains supply flash interruption further includes:
and the integral zero clearing module is used for zero clearing the integral of the PID controller in the control loop of the variable flow module.
In one embodiment, the power stabilizing apparatus 100 for mains supply flash interruption further includes:
and the amplitude limiting module is used for judging that the commercial power is recovered if the duration time that the commercial power voltage is greater than the preset voltage value reaches a second preset time after the commercial power is flashed off, and carrying out amplitude limiting processing on the current loop set value of the current converting module after the commercial power is recovered.
In one embodiment, the clipping module is specifically configured to:
and in a preset switching period after the mains supply is recovered, linearly increasing the current loop set value of the current conversion module from the first current set value to a preset current loop set value.
As can be seen from the foregoing embodiments, the power supply voltage stabilizing method provided in this embodiment first obtains the mains voltage input to the AC/DC module; if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed; and then, during the mains supply flash interruption, increasing the proportional parameter of the PID controller in the control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash interruption. The problem that commercial power flash-off stage voltage suddenly drops can be avoided through above-mentioned scheme to this embodiment, reduces output voltage drop value through increase proportion parameter to guarantee the stability of mains output voltage during commercial power flash-off.
Fig. 4 is a schematic diagram of a dc power supply according to an embodiment of the invention. As shown in fig. 4, the dc power supply 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in said memory 41 and executable on said processor 40. The processor 40, when executing the computer program 42, implements the steps in the embodiments of the power supply voltage stabilization method for mains supply flash described above, such as the steps 101 to 103 shown in fig. 1. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 110 to 130 shown in fig. 3.
The computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to implement the present invention. The 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 42 in the dc power supply 4.
The dc power supply 4 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or other computing devices. The dc power source may include, but is not limited to, a processor 40, a memory 41. Those skilled in the art will appreciate that fig. 4 is merely an example of the dc power supply 4, and does not constitute a limitation of the dc power supply 4, and may include more or less components than those shown, or combine certain components, or different components, for example, the dc power supply may also include input-output devices, network access devices, buses, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf 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 memory 41 may be an internal storage unit of the dc power supply 4, such as a hard disk or a memory of the dc power supply 4. The memory 41 may also be an external storage device of the dc power supply 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the dc power supply 4. Further, the memory 41 may include both an internal storage unit and an external storage device of the dc power supply 4. The memory 41 is used for storing the computer program and other programs and data required by the dc power supply. The memory 41 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 to perform all or part of the above-mentioned functions. 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.
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 in the present invention, it should be understood that the disclosed apparatus/dc power supply and method may be implemented in other ways. For example, the above-described apparatus/dc power supply embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division manners in actual implementation, 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.
The 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 of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments 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 the 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 contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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 power supply voltage stabilization method aiming at commercial power flash is characterized in that the method is applied to power supply equipment, the power supply equipment comprises an AC/DC module and a current transformation module, and the output end of the AC/DC module is connected with the input end of the current transformation module;
the method comprises the following steps:
acquiring mains voltage input into the AC/DC module;
if the duration time that the mains supply voltage is smaller than the preset voltage value reaches a first preset time, judging that the mains supply is flashed;
and during the mains supply flash, increasing the proportional parameter of a PID (proportion integration differentiation) controller in a control loop of the current conversion module so as to reduce the output voltage drop value of the current conversion module during the mains supply flash.
2. The power supply voltage stabilizing method aiming at commercial power flash-off of claim 1, wherein a bus capacitor is connected between the positive electrode and the negative electrode of the output end of the AC/DC module, and the bus capacitor meets the requirement
Wherein C represents a bus capacitance value, UoRepresenting the output voltage of said converter module, IoRepresenting the output current of said converter module, t representing a predetermined time, auoRepresenting the variation of the output voltage within the preset time t.
3. The method of claim 1, wherein after determining that the mains is flashed if the duration of the mains voltage being less than a preset voltage value reaches a first preset time, the method further comprises:
and clearing the integral of the PID controller in the control loop of the variable flow module.
4. The power supply voltage stabilization method for mains flicker of claim 1, wherein the method further comprises:
and if the commercial power is flashed off, the duration time that the commercial power voltage is greater than the preset voltage value reaches a second preset time, judging that the commercial power is recovered, and carrying out amplitude limiting treatment on the current loop set value of the current converting module after the commercial power is recovered.
5. The power supply voltage stabilizing method for commercial power flash-off as claimed in claim 4, wherein the limiting process of the current loop set value of the current transforming module after commercial power recovery comprises:
and in a preset switching period after the mains supply is recovered, linearly increasing the current loop set value of the current conversion module from the first current set value to a preset current loop set value.
6. A power supply voltage stabilizing device aiming at commercial power flash is characterized in that the power supply voltage stabilizing device is applied to power supply equipment, the power supply equipment comprises an AC/DC module and a current transformation module, and the output end of the AC/DC module is connected with the input end of the current transformation module;
the device comprises:
the mains supply voltage acquisition module is used for acquiring mains supply voltage input into the AC/DC module;
the commercial power flash-off judging module is used for judging commercial power flash-off if the duration time that the commercial power voltage is less than the preset voltage value reaches a first preset time;
the first voltage stabilizing module is used for increasing the proportional parameter of a PID controller in a control loop of the converter module during mains supply flash so as to reduce the output voltage drop value of the converter module during mains supply flash.
7. The power supply voltage stabilizing device for commercial power flash-off of claim 6, wherein a bus capacitor is connected between the positive electrode and the negative electrode of the output end of the AC/DC module, and the bus capacitor meets the requirement
Wherein C represents a bus capacitance value, UoRepresenting the output voltage of said converter module, IoRepresenting the output current of said converter module, t representing a predetermined time, auoRepresenting the variation of the output voltage within the preset time t.
8. A power supply regulation device for mains flicker as claimed in claim 6, wherein the device further comprises:
and the integral zero clearing module is used for zero clearing the integral of the PID controller in the control loop of the variable flow module.
9. A dc power supply comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 5 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN202110476373.6A CN113178871A (en) | 2021-04-29 | 2021-04-29 | Power supply voltage stabilizing method and device for mains supply flash interruption and direct-current power supply |
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| CN202110476373.6A CN113178871A (en) | 2021-04-29 | 2021-04-29 | Power supply voltage stabilizing method and device for mains supply flash interruption and direct-current power supply |
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| JP2012016155A (en) * | 2010-06-30 | 2012-01-19 | Sinfonia Technology Co Ltd | Motor controller |
| CN204012748U (en) * | 2014-08-08 | 2014-12-10 | 山东天启信息技术有限公司 | SPWM rectification feedback device for a kind of variable-frequency motor |
| CN106385102A (en) * | 2016-10-12 | 2017-02-08 | 东北大学 | Power supply voltage sag protector of super capacitor energy storage and control method thereof |
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