CN113777429A - Filter capacitor failure early warning method and control device - Google Patents
Filter capacitor failure early warning method and control device Download PDFInfo
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- CN113777429A CN113777429A CN202110987014.7A CN202110987014A CN113777429A CN 113777429 A CN113777429 A CN 113777429A CN 202110987014 A CN202110987014 A CN 202110987014A CN 113777429 A CN113777429 A CN 113777429A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 171
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- 238000004590 computer program Methods 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 12
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- 238000010586 diagram Methods 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without 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
- H02M7/537—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without 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
- H02M7/537—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The invention relates to the field of power supply correlation, in particular to a filter capacitor failure early warning method and a control device, wherein the method comprises the following steps: when the uninterruptible power supply supplies power to a load, detecting the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply; and when the voltage difference between the current voltage and the standard sinusoidal voltage value is greater than a preset voltage difference threshold value and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is failed in the open circuit mode, and sending failure alarm information for indicating that the filter capacitor is failed in the open circuit mode. The invention can send out warning information in time when the filter capacitor is in open circuit failure, thereby avoiding the influence on load work due to the open circuit failure of the filter capacitor.
Description
Technical Field
The invention relates to the field of power supply correlation, in particular to a filter capacitor failure early warning method and a control device.
Background
At present, when an uninterruptible power supply supplies power to a load, a direct current is generally converted into an SPWM (Sinusoidal Pulse Width Modulation) waveform, then LC filtering is performed on the SPWM waveform to obtain an ac sine wave, and finally the load is supplied with power through the ac sine wave.
However, when a filter capacitor for LC filtering of the SPWM waveform is aged and disabled, an ac sine wave obtained by filtering may be distorted, resulting in a decrease in power supply quality and an impact on load operation.
Disclosure of Invention
The invention aims to provide a filter capacitor failure early warning method and a control device, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a filter capacitor failure early warning method comprises the following steps:
step S1, when the UPS supplies power to the load, the current voltage or current at two ends of a filter capacitor in a filter circuit of the UPS is detected;
step S2, in the step S1, when the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply is detected, when the voltage difference between the current voltage and a standard sinusoidal voltage value is larger than a preset voltage difference threshold value, and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is in open circuit failure, and sending failure warning information for indicating that the filter capacitor is in open circuit failure;
step S3, in the step S1, when a current is detected across a filter capacitor in a filter circuit of the uninterruptible power supply, calculating a degree of decrease in a capacitance value of the filter capacitor based on the current;
step S4, in step S3, when the capacitance value of the filter capacitor is decreased to a predetermined interval, sending alarm information corresponding to the predetermined interval to indicate that load operation is affected, where the predetermined interval is multiple, and each predetermined interval corresponds to one alarm information.
Preferably, after it is determined that the filter capacitor is not open-circuit failed, the current of the filter capacitor in the filter circuit of the uninterruptible power supply is detected.
Preferably, the current voltage at two ends of the filter capacitor in the filter circuit of the uninterruptible power supply is detected when the capacitance value decrease degree of the filter capacitor is higher than a preset decrease threshold value.
Preferably, the preset interval comprises a first preset interval and a second preset interval, the first preset interval corresponds to first warning information, the second preset interval corresponds to second warning information, the lower limit value of the first preset interval is equal to the upper limit value of the second preset interval, and the first warning information, the second warning information and the warning level of the failure warning information are sequentially improved.
Preferably, the calculating of the degree of capacitance value reduction of the filter capacitor based on the present current includes: calculating the current capacitance value of the filter capacitor according to the current and the reference voltage of the uninterruptible power supply, and determining the capacitance value reduction degree of the filter capacitor based on the current capacitance value and the reference capacitance value of the filter capacitor.
Preferably, the detecting a current voltage across a filter capacitor in a filter circuit of the uninterruptible power supply includes: sampling voltages at two ends of the filter capacitor at a first preset frequency; the detecting a current of a filter capacitor in a filter circuit of the uninterruptible power supply includes: and sampling the current of the filter capacitor at a second preset frequency.
Preferably, a filter capacitor failure control device includes a control device body, a memory, a processor and a computer program stored in the memory and executable on the processor are installed in the control device body, and the processor executes the computer program to implement the steps of the filter capacitor failure early warning method according to any one of claims 1 to 6.
Preferably, the controlling means body sets up inside uninterrupted power source equipment, uninterrupted power source equipment includes DC power supply, three-phase half-bridge circuit and three-phase filter circuit, the direct current of DC power supply output passes through the three-phase half-bridge circuit and truns into three-phase SPWM waveform, three-phase filter circuit truns into three-phase SPWM waveform to three-phase sinusoidal alternating current again, for the load power supply.
Compared with the prior art, the invention has the beneficial effects that: when the uninterruptible power supply supplies power to a load, the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply is detected; and when the voltage difference between the current voltage and the standard sinusoidal voltage value is greater than a preset voltage difference threshold value and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is failed in the open circuit mode, and sending failure alarm information for indicating that the filter capacitor is failed in the open circuit mode. The invention judges whether the filter capacitor is broken or not to fail according to the voltage value of the filter capacitor when the uninterruptible power supply supplies power, and can send out warning information when the filter capacitor is broken or not to fail so as to avoid the influence on load work caused by the broken failure of the filter capacitor.
Drawings
Fig. 1 is a flowchart illustrating an implementation of a filter capacitor failure early warning method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a filter capacitor failure early warning device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a filter capacitor failure early warning device according to an embodiment of the present invention
FIG. 4 is a schematic diagram of a control device provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an uninterruptible power supply according to an embodiment of the present invention.
In the figure: 3. a filter capacitor failure early warning device; 31. a voltage detection module; 32. an alarm module; 33. a current detection module; 4. a control device; 40. a processor; 41. a reservoir; 42. a computer program.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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.
Referring to fig. 1, it shows a flowchart of an implementation of the filter capacitor failure early warning method provided by the embodiment of the present invention, which is detailed as follows:
In this embodiment, the present voltage is an instantaneous value. The current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply represents the voltage instantaneous value at two ends of the filter capacitor during working. The detected current voltage may be one cycle or a plurality of cycles to improve the accuracy of the detected value. The filter circuit comprises a capacitor and an inductor, and is used for converting the SPWM waveform into sine alternating current so as to supply power to a load.
The filter circuit in this embodiment may be single-phase, three-phase, or multi-phase, and correspondingly, the sinusoidal alternating current obtained by filtering may also be single-phase, three-phase, or multi-phase, respectively. The failure early warning detection of the filter capacitor is not influenced by the number of phases in the filter circuit, and the failure early warning detection of the filter capacitor of each phase is independently carried out.
And 102, when the voltage difference between the current voltage and the standard sinusoidal voltage value is greater than a preset voltage difference threshold value and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is failed in the open circuit mode, and sending failure alarm information for indicating that the filter capacitor is failed in the open circuit mode.
In this embodiment, the standard sinusoidal voltage value is a preset value, and represents a voltage value at two ends of the filter capacitor with a normal capacitance value when the filter capacitor works. In this embodiment, the voltage difference between the current voltage and the standard sinusoidal voltage value may represent the degree of the capacitance value of the current filter capacitor deviating from the normal capacitance value, and if the voltage difference is greater than the preset voltage difference threshold, it indicates that the degree of the capacitance value of the current filter capacitor deviating from the normal capacitance value has reached the degree of the open circuit failure. On the other hand, if the current filter capacitor is in an open circuit failure state, the circuit where the current filter capacitor is located is in an open circuit state, and the voltage value at the two ends of the current filter capacitor should be equal to the bus voltage of the uninterruptible power supply. Therefore, the determination of whether or not the filter capacitor is open-circuited or failed may be performed using any one of the above two conditions, or the determination of whether or not the filter capacitor is open-circuited or failed may be performed in combination with the two conditions, which is not limited herein.
The failure warning information in this embodiment is used to indicate that the current filter capacitor is in an open circuit failure state, and accordingly, may also be used to automatically enter a circuit protection mode or remind a worker to use a corresponding protection measure, for example, to switch to a bypass for output, so as to ensure stable and reliable operation of a load.
Optionally, on the basis of the embodiment shown in fig. 1, the method further includes:
In this embodiment, steps 201 to 203 are a process of performing an alarm by detecting the current of the filter capacitor; the steps 101 to 102 are a process of performing alarm by detecting the voltage of the filter capacitor; the order of execution of the two is not limited herein. For example, it may be implemented by any of the following three possible implementations, as follows:
in a first possible implementation manner, steps 201 to 203 and steps 101 to 102 may be executed in parallel, and executed relatively independently, that is, voltage and current detection may be performed on the filter capacitor synchronously, where when the filter capacitor is close to an open circuit failure, the value of the current value is small, and it is convenient to determine whether the filter capacitor is open circuit failure or not through the current voltage; when the capacitance value of the filter capacitor is not reduced to a large extent, the specific reduction degree of the capacitance value of the filter capacitor is determined more accurately through the current.
In a second possible implementation manner, detecting a current of a filter capacitor in a filter circuit of an uninterruptible power supply includes: after determining that the filter capacitor is not open circuit failure, detecting the current of the filter capacitor in a filter circuit of the uninterruptible power supply.
In this implementation manner, step 101 may be executed first, and whether the filter capacitor is open-circuit failed or not is determined according to the current voltage of the filter capacitor, and if the filter capacitor is not open-circuit failed, steps 201 and 202 are executed again, the current is detected, the capacitance value decrease degree of the filter capacitor is determined, and whether step 203 is executed or not is determined according to the decrease degree. If the current voltage of the filter capacitor is determined to be open-circuit failure after the step 101 is executed, the failure warning message is directly sent without executing the steps 201 to 202, detecting the current, and executing the step 203 accordingly.
In a third possible implementation manner, detecting a current voltage across a filter capacitor in a filter circuit of an uninterruptible power supply includes: and under the condition that the capacitance value reduction degree of the filter capacitor is higher than a preset reduction threshold value, detecting the current voltage at two ends of the filter capacitor in a filter circuit of the uninterruptible power supply.
In this implementation, steps 201 and 202 may be executed first, the current of the filter capacitor is detected, if the calculated capacitance value reduction degree of the filter capacitor is higher than a preset reduction threshold, the filter capacitor may have an open circuit failure, and then step 101 is executed to detect the current voltage of the filter capacitor; if the calculated capacitance value reduction degree of the filter capacitor is not higher than the preset reduction threshold, the filter capacitor is not broken and fails, and at this time, the step 101 is not executed, and the corresponding step 102 is not executed, that is, the current voltage of the filter capacitor does not need to be detected.
Optionally, on the basis of any of the foregoing embodiments, the preset interval includes a first preset interval and a second preset interval, the first preset interval corresponds to the first alarm information, the second preset interval corresponds to the second alarm information, a lower limit value of the first preset interval is equal to an upper limit value of the second preset interval, and alarm levels of the first alarm information, the second alarm information, and the failure alarm information are sequentially increased.
In this embodiment, if the low level, the high level and the medium level are divided, the first warning information is low-level warning information, the second warning information is medium-level warning information, and the failure warning information is high-level warning information. The specific values of the first preset interval and the second preset interval may be determined according to actual conditions, and are not limited herein. For example, the first predetermined interval may be 25% to 50%, and the second predetermined interval may be 50% to 70%. When the capacitance is reduced, the detected current is reduced; when the capacitance value of the filter capacitor is reduced within 25%, the load operation is not influenced. When the capacitance value of the filter capacitor is reduced by 25% -50%, the output voltage ripple becomes large, but the load can still operate, and at the moment, the first warning information of a low level is sent. When the capacitance value of the filter capacitor is reduced by 50% -70%, the output voltage ripple is further increased, the load operation is greatly influenced, and at the moment, second warning information of a middle level is sent. The harshest working condition is that the filter capacitor is broken and fails, at the moment, rapid detection and protection are needed, and the bypass output is switched to, otherwise, the load cannot work, and at the moment, high-level failure warning information is sent out.
Optionally, on the basis of any of the foregoing embodiments, calculating the capacitance value reduction degree of the filter capacitor based on the current includes: calculating the current capacitance value of the filter capacitor according to the current and the reference voltage of the uninterruptible power supply; and determining the capacitance value reduction degree of the filter capacitor based on the current capacitance value and the reference capacitance value of the filter capacitor.
In this embodiment, the current capacitance value of the filter capacitor may be calculated based on the formula I ═ UC ω, and the reference capacitance value of the filter capacitor represents the capacitance value of the filter capacitor when aging does not occur, where I represents the effective current value of the filter capacitor, U represents the effective voltage value across the filter capacitor, C represents the current capacitance value of the filter capacitor, and ω represents the angular frequency of the sinusoidal alternating current. The difference value between the current capacitance value and the reference capacitance value is the capacitance value of the current filter capacitor which has been reduced, and the ratio of the reduced capacitance value to the reference capacitance value is the capacitance value reduction degree of the filter capacitor.
Optionally, on the basis of any of the foregoing embodiments, detecting a current voltage across a filter capacitor in a filter circuit of the uninterruptible power supply includes: sampling voltages at two ends of the filter capacitor at a first preset frequency; detecting a present current of a filter capacitor in a filter circuit of an uninterruptible power supply, comprising: and sampling the current of the filter capacitor at a second preset frequency.
In this embodiment, the first predetermined frequency and the second predetermined frequency may be the same or different, and are not limited herein. For example, the first predetermined frequency is the same as the second predetermined frequency. The frequency at which the voltages and currents are sampled in this case may be determined based on the standard sine value:
standard sine value (k) sin2 π k/N, k ∈ [0, N-1]
Wherein, N is a carrier ratio, namely the sampling times in a sine wave period; k is the current sample point.
When the uninterruptible power supply supplies power to a load, the embodiment of the invention detects the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply; and when the voltage difference between the current voltage and the standard sinusoidal voltage value is greater than a preset voltage difference threshold value and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is failed in the open circuit mode, and sending failure alarm information for indicating that the filter capacitor is failed in the open circuit mode. The invention judges whether the filter capacitor is broken or not to fail according to the voltage value of the filter capacitor when the uninterruptible power supply supplies power, and can send out warning information when the filter capacitor is broken or not to fail so as to avoid the influence on load work caused by the broken failure of the filter capacitor.
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. 3 shows a schematic structural diagram of a filter capacitor failure early warning apparatus provided in an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, which are detailed as follows:
as shown in fig. 3, the filter capacitor failure early warning device 3 includes: the voltage detection module 31 is configured to detect a current voltage across a filter capacitor in a filter circuit of the uninterruptible power supply when the uninterruptible power supply supplies power to a load; and the alarm module 32 is configured to determine that the filter capacitor is out of circuit and send failure alarm information for indicating that the filter capacitor is out of circuit when the voltage difference between the current voltage and the standard sinusoidal voltage value is greater than a preset voltage difference threshold value and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply.
Optionally, the filter capacitor failure early warning apparatus 3 further includes: the current detection module 33 is configured to detect a current of a filter capacitor in a filter circuit of the uninterruptible power supply when the uninterruptible power supply supplies power to the load; the warning module 32 is further configured to calculate a capacitance value decrease degree of the filter capacitor based on the current, and send warning information corresponding to a preset interval when the capacitance value decrease degree of the filter capacitor is located in a preset interval, so as to indicate that load operation is affected, where the preset interval is multiple, and each preset interval corresponds to one warning information.
Optionally, the current detection module 33 is further configured to: after determining that the filter capacitor is not open circuit failure, detecting the current of the filter capacitor in a filter circuit of the uninterruptible power supply.
Optionally, the voltage detection module 31 is further configured to: and under the condition that the capacitance value reduction degree of the filter capacitor is higher than a preset reduction threshold value, detecting the current voltage at two ends of the filter capacitor in a filter circuit of the uninterruptible power supply.
Optionally, the preset interval includes a first preset interval and a second preset interval, the first preset interval corresponds to the first warning information, the second preset interval corresponds to the second warning information, a lower limit value of the first preset interval is equal to an upper limit value of the second preset interval, and warning levels of the first warning information, the second warning information, and the failure warning information are sequentially increased.
Optionally, the alarm module 32 is specifically configured to: calculating the current capacitance value of the filter capacitor according to the current and the reference voltage of the uninterruptible power supply; and determining the capacitance value reduction degree of the filter capacitor based on the current capacitance value and the reference capacitance value of the filter capacitor.
Optionally, the voltage detection module 31 is specifically configured to: sampling voltages at two ends of the filter capacitor at a first preset frequency; the current detection module 33 is specifically configured to: and sampling the current of the filter capacitor at a second preset frequency.
Fig. 4 is a schematic diagram of a control device according to an embodiment of the present invention. As shown in fig. 4, the control device 4 of this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. The processor 40 executes the computer program 42 to implement the steps of the above-mentioned filter capacitor failure warning method embodiments, such as the steps 101 to 102 shown in fig. 1. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the various modules/units in the various device embodiments described above, such as the functions of the units 31 to 32 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. One or more of the 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 control device 4.
The control device 4 may be a computing device such as a desktop computer, a notebook computer, a palm computer, and a cloud server. The control device may include, but is not limited to, a processor 40, a memory 41. It will be understood by those skilled in the art that fig. 4 is merely an example of the control apparatus 4, and does not constitute a limitation of the control apparatus 4, and may include more or less components than those shown, or combine some components, or different components, for example, the control apparatus may further include input and output devices, network access devices, buses, and the like.
The processor 40 may be a central processing unit, but may also be other general purpose processors, digital signal processors, application specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or the like. 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 control device 4, such as a hard disk or a memory of the control device 4. The memory 41 may also be an external storage device of the control apparatus 4, such as a plug-in hard disk, a smart memory card, a secure digital card, a flash memory card, etc. provided on the control apparatus 4. Further, the memory 41 may also include both an internal storage unit of the control apparatus 4 and an external storage device. The memory 41 is used for storing computer programs and other programs and data required for controlling the apparatus. The memory 41 may also be used to temporarily store data that has been output or is to be output.
An embodiment of the present invention further provides an uninterruptible power supply apparatus, where the uninterruptible power supply apparatus includes the control device shown in fig. 4, and the uninterruptible power supply apparatus may further include other devices or apparatuses, which are not limited herein.
Referring to fig. 5, in a specific embodiment, the uninterruptible power supply apparatus may further include a direct current power supply, a three-phase half-bridge circuit, and a three-phase filter circuit. In the working process of the uninterrupted power supply, direct current output by the direct current power supply is converted into three-phase SPWM waveform through the three-phase half-bridge circuit, and the three-phase SPWM waveform is converted into three-phase sinusoidal alternating current through the three-phase filter circuit to supply power to a load.
In this example, cdcIndicating DC power in an uninterruptible power supply unit, vdcRepresenting the voltage across the DC supply, i.e. the bus voltage, the inductance L1And a capacitor C1Inductor L2And a capacitor C2Inductor L3And a capacitor C3The filter capacitors are respectively connected in series to form a first filter circuit, a second filter circuit and a third filter circuitc1Represents the capacitance C1Current voltage across, ic1Represents the capacitance C1Current of (v)c2Represents the capacitance C2Current voltage across, ic2Represents the capacitance C2Current of (v)c3Represents the capacitance C3Current voltage across, ic3Represents the capacitance C3The current of the current.
The uninterruptible power supply apparatus may also include a current sensor and/or a voltage sensor. And each phase of filter circuit is provided with a current sensor and/or a voltage sensor so as to detect the current and/or the voltage of the filter capacitor. The choice of the specific type or model of current sensor and/or voltage sensor is not limited herein. And the current sensor and/or the voltage sensor which are configured on each phase of filter circuit are connected with the control device of the uninterrupted power supply. The control device collects the current and/or voltage of the filter capacitor through a current sensor and/or a voltage sensor configured on each phase of filter circuit.
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 by the present invention, it should be understood that the disclosed apparatus/control apparatus and method may be implemented in other ways. For example, the above-described apparatus/control apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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 said computer program code, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunications signal, software distribution medium, etc. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A filter capacitor failure early warning method is characterized by comprising the following steps:
step S1, when the UPS supplies power to the load, the current voltage or current at two ends of a filter capacitor in a filter circuit of the UPS is detected;
step S2, in the step S1, when the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply is detected, when the voltage difference between the current voltage and a standard sinusoidal voltage value is larger than a preset voltage difference threshold value, and/or the current voltage is consistent with the bus voltage of the uninterruptible power supply, determining that the filter capacitor is in open circuit failure, and sending failure warning information for indicating that the filter capacitor is in open circuit failure;
step S3, in the step S1, when a current is detected across a filter capacitor in a filter circuit of the uninterruptible power supply, calculating a degree of decrease in a capacitance value of the filter capacitor based on the current;
step S4, in step S3, when the capacitance value of the filter capacitor is decreased to a predetermined interval, sending alarm information corresponding to the predetermined interval to indicate that load operation is affected, where the predetermined interval is multiple, and each predetermined interval corresponds to one alarm information.
2. The filter capacitor failure early warning method according to claim 1, wherein: and detecting the current of a filter capacitor in a filter circuit of the uninterruptible power supply after determining that the filter capacitor is not broken and failed.
3. The filter capacitor failure early warning method according to claim 1, wherein: and detecting the current voltage at two ends of a filter capacitor in a filter circuit of the uninterruptible power supply under the condition that the capacitance value reduction degree of the filter capacitor is higher than a preset reduction threshold value.
4. The filter capacitor failure early warning method according to claim 1, wherein: the preset interval comprises a first preset interval and a second preset interval, the first preset interval corresponds to first alarm information, the second preset interval corresponds to second alarm information, the lower limit value of the first preset interval is equal to the upper limit value of the second preset interval, and the alarm levels of the first alarm information, the second alarm information and the failure alarm information are sequentially improved.
5. The filter capacitor failure early warning method according to claim 1, wherein: the calculating a degree of capacitance value reduction of the filter capacitance based on the present current comprises: calculating the current capacitance value of the filter capacitor according to the current and the reference voltage of the uninterruptible power supply, and determining the capacitance value reduction degree of the filter capacitor based on the current capacitance value and the reference capacitance value of the filter capacitor.
6. The filter capacitor failure early warning method according to claim 1, wherein: the detecting a current voltage across a filter capacitor in a filter circuit of the uninterruptible power supply includes: sampling voltages at two ends of the filter capacitor at a first preset frequency; the detecting a current of a filter capacitor in a filter circuit of the uninterruptible power supply includes: and sampling the current of the filter capacitor at a second preset frequency.
7. A filter capacitor failure control device is characterized in that: the filter capacitor failure early warning method comprises a control device body (4), wherein a memory (41), a processor (40) and a computer program (42) which is stored in the memory (41) and can run on the processor (40) are installed in the control device body (4), and when the processor (40) executes the computer program (42), the steps of the filter capacitor failure early warning method are realized according to any one of the claims 1 to 6.
8. The filter capacitor failure control device of claim 7, wherein: the utility model discloses a power supply, including controlling means body, uninterrupted power source equipment, three-phase half-bridge circuit and three-phase filter circuit, controlling means body (4) set up inside uninterrupted power source equipment, uninterrupted power source equipment includes DC power supply, three-phase half-bridge circuit and three-phase filter circuit, the direct current of DC power supply output truns into three-phase SPWM waveform through three-phase half-bridge circuit, three-phase filter circuit truns into three-phase SPWM waveform into three-phase sinusoidal alternating current again, for the load power supply.
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