CN114089057A - Fault diagnosis method and terminal of power supply system - Google Patents
Fault diagnosis method and terminal of power supply system Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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Abstract
The invention provides a fault diagnosis method and a terminal of a power supply system. The direct current power supply system comprises a converter device and a monitoring device, wherein the monitoring device comprises a bus voltage detection module and an input detection module; the method comprises the following steps: acquiring bus voltage detected by a bus voltage detection module; acquiring input power detected by an input detection module; acquiring the output voltage of the converter equipment; acquiring the output current of the converter equipment; calculating the equivalent voltage output by the converter equipment according to the input power and the output current; and comparing the bus voltage, the output voltage and the direct equivalent voltage, and determining the fault of the power supply system according to the comparison result. The invention compares the voltages of three sources in the power supply system, can determine whether the power supply system has faults or not based on the comparison result, and can determine the fault position in the power supply system based on the source corresponding to the abnormal voltage.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a fault diagnosis method and a terminal of a power supply system.
Background
The power supply system comprises an inverter device and a monitoring device. In the working process of the power supply system, the monitoring device needs to collect, monitor and regulate the input parameters and the output parameters of the converter device so as to control the working state of the power supply system.
However, both the monitoring device and the control device may have a fault, for example, when a collection module of the monitoring device has a fault, the collected bus voltage value may be abnormal, and controlling the converter device according to the abnormal bus voltage value may cause abnormal output of the converter device, thereby causing a serious accident such as a system downtime.
Disclosure of Invention
The invention provides a fault diagnosis method and a terminal of a power supply system, which aim to solve the problem of timely finding out faults of the power supply system.
In a first aspect, the invention provides a fault diagnosis method for a power supply system, wherein the power supply system comprises converter equipment and monitoring equipment, and the monitoring equipment comprises a bus voltage detection module and an input detection module; the fault diagnosis method comprises the following steps:
acquiring bus voltage detected by a bus voltage detection module;
acquiring input power detected by an input detection module;
acquiring the output voltage of the converter equipment;
acquiring the output current of the converter equipment;
calculating the equivalent voltage output by the converter equipment according to the input power and the output current;
and comparing the bus voltage, the output voltage and the equivalent voltage, and determining a diagnosis result of the power supply system according to the comparison result.
In one possible implementation manner, the power supply system includes a dc power supply system, the converter device includes a rectifier device, and the input detection module includes an ac input detection module;
the bus voltage comprises a direct current bus voltage; the input power comprises alternating current input power;
the bus voltage that obtains bus voltage detection module detection includes:
acquiring direct-current bus voltage detected by a bus voltage detection module;
the obtaining of the input power detected by the input detection module comprises:
acquiring alternating current input power detected by an alternating current input detection module;
acquiring the output voltage of the converter equipment comprises the following steps:
acquiring the output voltage of the rectifying equipment;
obtaining the output current of the inverter device comprises:
acquiring output current of a rectifying device;
calculating the equivalent voltage output by the converter device according to the input power and the output current comprises:
calculating the direct current equivalent voltage output by the rectifying equipment according to the alternating current input power and the output current;
comparing the bus voltage, the output voltage and the equivalent voltage, and determining a diagnosis result of the power supply system according to the comparison result comprises:
and comparing the direct current bus voltage, the output voltage and the direct current equivalent voltage, and determining the diagnosis result of the direct current power supply system according to the comparison result.
In one possible implementation, comparing the bus voltage, the output voltage, and the equivalent voltage, and determining the fault of the power supply system according to the comparison result includes:
comparing the bus voltage with the output voltage;
and if the absolute value of the difference between the bus voltage and the output voltage is not greater than a first preset threshold, determining that the diagnosis result of the power supply system is a first result.
In one possible implementation, the method further includes:
if the absolute value of the difference between the bus voltage and the output voltage is greater than a first preset threshold value, comparing the output voltage with the equivalent voltage;
and if the absolute value of the difference between the output voltage and the equivalent voltage is not greater than a second preset threshold, determining that the diagnosis result of the power supply system is a second result.
In one possible implementation, the method further includes:
if the absolute value of the difference between the output voltage and the equivalent voltage is greater than a second preset threshold value, comparing the bus voltage with the equivalent voltage;
and if the absolute value of the difference between the bus voltage and the equivalent voltage is greater than a third preset threshold, determining that the diagnosis result of the power supply system is a third result.
In one possible implementation, the method further includes:
if the absolute value of the difference between the bus voltage and the equivalent voltage is not greater than a third preset threshold, respectively judging whether the input current and the output current of the power supply system are abnormal or not;
if the input current and/or the output current of the power supply system are abnormal, judging that the diagnosis result of the power supply system is a third result;
and if the input current and the output current of the power supply system are normal, judging that the diagnosis result of the power supply system is a first result.
In one possible implementation, the converter device comprises a plurality of converter modules;
calculating the equivalent voltage output by the converter device according to the input power and the output current comprises:
calculating the equivalent voltage output by the converter equipment according to the input power, the output current and a preset formula;
the preset formula is as follows:
wherein, U represents the equivalent voltage, P represents the input power, η represents the preset voltage conversion efficiency, n represents the number of the current transformation modules in the current transformation equipment, and I represents the output current.
In one possible implementation, the separately determining whether the input current and the output current of the power supply system are abnormal includes:
acquiring input power, output power, input voltage, output voltage, input current and output current of a power supply system;
calculating a first input current of the power supply system based on the input power and the input voltage of the power supply system;
calculating a first output current of the power supply system based on the output power and the output voltage of the power supply system;
if the difference between the first input current and the input current of the power supply system is smaller than a first current threshold value, judging that the input current of the power supply system is normal;
if the difference between the first input current and the input current of the power supply system is not smaller than the first current threshold, judging that the input current of the power supply system is abnormal;
if the difference between the first output current and the output current of the power supply system is smaller than a second current threshold value, judging that the output current of the power supply system is normal;
and if the difference between the first output current and the output current of the power supply system is not less than the second current threshold, judging that the output current of the power supply system is abnormal.
In a second aspect, the present invention provides a terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method as shown in the first aspect or any one of the possible implementations of the first aspect when executing the computer program.
In a third aspect, the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as set forth in the first aspect or any one of the possible implementations of the first aspect.
The invention provides a fault diagnosis method and a terminal of a power supply system, wherein the power supply system comprises a converter device and a monitoring device, and the monitoring device comprises a bus voltage detection module and an input detection module; the method comprises the following steps: acquiring bus voltage detected by a bus voltage detection module; acquiring input power detected by an input detection module; acquiring the output voltage of the converter equipment; acquiring the output current of the converter equipment; calculating the equivalent voltage output by the converter equipment according to the input power and the output current; and comparing the bus voltage, the output voltage and the equivalent voltage, and determining the fault of the power supply system according to the comparison result. The embodiment of the invention compares the voltages of three sources in the power supply system, can determine whether the power supply system has faults or not based on the comparison result, and can determine the fault position in the power supply system based on the source corresponding to the abnormal voltage.
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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 of a fault diagnosis method for a power supply system according to an embodiment of the present invention;
fig. 2 is an application scenario diagram of a fault diagnosis method for a power supply system according to another embodiment of the present invention;
fig. 3 is a flowchart of an implementation of a fault diagnosis method for a power supply system according to an embodiment of the present invention;
fig. 4 is a flowchart of a fault diagnosis method for a power supply system according to another embodiment of the present invention;
fig. 5 is a flowchart of a fault diagnosis method for a power supply system according to another embodiment of the present invention;
fig. 6 is a flowchart of an implementation of a fault diagnosis method for a power supply system according to another embodiment of the present invention;
fig. 7 is a flowchart of a fault diagnosis method for a power supply system according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a fault diagnosis device of a power supply system according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a terminal according to 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.
Fig. 2 is an application scenario diagram of a fault diagnosis method for a power supply system according to another embodiment of the present invention. As shown in fig. 2, the method may be applied to an ac power supply system, where the ac power supply system includes an inverter device and a monitoring device, and the monitoring device includes a bus voltage detection module and an input detection module. In the working process of the alternating current power supply system, the inverter device inverts the input direct current to obtain alternating current, the alternating current is output to the bus, the monitoring device samples the bus voltage while supplying power for a load, and the output parameters of the inverter device are adjusted based on the sampled voltage.
Fig. 2 is an application scenario diagram of a fault diagnosis method for a power supply system according to an embodiment of the present invention. As shown in fig. 2, the method can also be applied to a dc power supply system, where the dc power supply system includes a rectifying device and a monitoring device, and the monitoring device includes a bus voltage detection module and an ac input detection module. In the working process of the direct current power supply system, the rectifying equipment rectifies input alternating current to obtain direct current, the direct current is output to a bus to supply power to a load and a battery pack, meanwhile, the monitoring equipment samples the voltage of the bus, and output parameters of the rectifying equipment are adjusted based on the sampled voltage.
Referring to fig. 3, it shows an implementation flowchart of the fault diagnosis method of the power supply system provided by the embodiment of the present invention, which is detailed as follows:
In this embodiment, the method is applied to a terminal, where the terminal may be a monitoring device or a computer device other than the monitoring device, and the following explanation is performed in this embodiment by taking the monitoring device as an example. In the working process of the power supply system, a bus voltage detection module in the monitoring equipment can continuously sample the bus voltage, and the obtained sampling voltage is the bus voltage.
In this embodiment, the input detection module in the monitoring device is configured to detect an electrical signal parameter of the input variable current device. The monitoring device can diagnose the converting capacity of the converting device by comparing the input parameter and the output parameter of the converting device.
In this embodiment, a plurality of converter modules in the converter device perform the conversion operation simultaneously. For each current transformation module, the monitoring device firstly obtains a plurality of output voltages of the current transformation module at different moments through the CAN bus, then selects a median value from the plurality of output voltages of the current transformation module as the output voltage of the current transformation module, and finally averages the output voltages of the current transformation modules to obtain the output voltage of the current transformation device.
And step 304, acquiring the output current of the converter device.
In this embodiment, the monitoring device is connected to the converter device through the CAN bus, and CAN directly obtain the output current of the converter device. The above parameters in this embodiment may be acquired in any order.
And step 305, calculating the equivalent voltage output by the converter device according to the input power and the output current.
In this embodiment, the converter device converts the input direct current or alternating current to obtain direct current or alternating current, and the electric energy is partially lost in the conversion process, so the input power of the converter device is greater than the output power, but the difference between the input power and the output power is within a normal range, the output power corresponding to the input power under normal conditions can be calculated based on empirical values, and the voltage which the converter device should output can be determined by combining the actual output current of the converter device.
And step 306, comparing the bus voltage, the output voltage and the equivalent voltage, and determining a diagnosis result of the power supply system according to the comparison result.
In this embodiment, the bus voltage is a sampling voltage obtained by sampling the bus by the monitoring device, the output voltage is a voltage actually output by the converter device, and the equivalent voltage is a voltage that should be output by the converter device. If all parts of the power supply system have no faults, the voltages of three different sources, namely the bus voltage, the output voltage and the equivalent voltage, are in the same range. If there is a value that is too different from the other values in the bus voltage, the output voltage, and the equivalent voltage, it may be that there is a fault in the position corresponding to the value. If the difference between the three values is too large, multiple faults may occur in the power supply system, or a relatively serious fault may occur in the monitoring device, and emergency protective measures need to be taken and the fault needs to be eliminated.
Referring to fig. 4, in some embodiments, step 306 comprises:
In step 402, the diagnosis result of the power supply system is determined as a first result.
In this embodiment, the first result is that the power supply system operates normally, and the monitoring device may regulate and control the output parameter of the converter device based on the bus voltage. If the absolute value of the difference between the bus voltage and the output voltage is not greater than the first preset threshold, the bus voltage and the output voltage are normal, and the fact that the power supply system has no fault can be determined without comparing the bus voltage and the output voltage with the equivalent voltage respectively.
Referring to fig. 5, in some embodiments, step 401 further comprises:
if the absolute value of the difference between the bus voltage and the output voltage is greater than the first preset threshold, step 403 is executed.
In step 404, the diagnosis result of the power supply system is determined as a second result.
In this embodiment, the second result is that the bus voltage detection module has a fault, and the monitoring device needs to regulate and control the output parameter of the converter device based on the output voltage. If the absolute value of the difference between the bus voltage and the output voltage is greater than the first preset threshold, it indicates that the bus voltage and the output voltage have too large a difference, and the bus voltage or the output voltage may be abnormal. In order to further confirm whether the bus voltage or the output voltage is abnormal, the output voltage and the equivalent voltage can be compared, if the absolute value of the difference between the output voltage and the equivalent voltage is not larger than a second preset threshold value, the output voltage and the equivalent voltage are both normal, the bus voltage and the equivalent voltage do not need to be compared, the abnormal voltage can be determined as the bus voltage, and the fault part is determined as the bus voltage detection module.
Referring to fig. 6, in some embodiments, step 403 further comprises:
if the absolute value of the difference between the output voltage and the equivalent voltage is greater than the second predetermined threshold, step 405 is executed.
In step 406, the diagnosis result of the power supply system is determined to be a third result.
In this embodiment, the third result is that there are multiple faults in the power supply system, and it is necessary to stop the operation control mode, regulate and control the output parameters of the converter device by using the preset monitoring failure voltage, and turn off the IGBT at the battery pack. On the basis that the absolute value of the difference between the bus voltage and the output voltage is greater than a first preset threshold value and the absolute value of the difference between the output voltage and the equivalent voltage is greater than a second preset threshold value, if the absolute value of the difference between the bus voltage and the equivalent voltage is greater than a third preset threshold value, it is indicated that the bus voltage, the output voltage and the equivalent voltage are inconsistent, at this time, a plurality of faults may exist in the power supply system, the monitoring of the power supply system by the monitoring equipment may fail, and an emergency protection state needs to be entered.
In some embodiments, step 405 further comprises:
if the absolute value of the difference between the bus voltage and the equivalent voltage is not greater than the third preset threshold, go to step 407;
in step 409, the diagnosis result of the power supply system is determined as a first result.
In this embodiment, if the absolute value of the difference between the bus voltage and the equivalent voltage is not greater than the third preset threshold, that is, the bus voltage is the same as the equivalent voltage, and the difference between the bus voltage and the equivalent voltage is greater than the difference between the bus voltage and the output voltage, there are two fault conditions: the first is that the corresponding part of the bus voltage and the equivalent voltage has a fault, and the second is that the corresponding part of the output voltage has a fault. To determine a particular fault condition, it may be determined whether the input and output currents of the power supply system are abnormal. If the input current and/or the output current of the power supply system are abnormal, the working state of the power supply system is abnormal, the bus voltage obtained by the bus voltage detection module and the input detection module possibly having the same deviation is consistent with the equivalent voltage, and the specific fault condition cannot be determined at the moment, so that monitoring failure protection is required; if the input current and the output current of the power supply system are normal, it indicates that the power supply system has no problem in operation, and the monitoring device can regulate and control the output parameters of the converter device based on the bus voltage.
In some embodiments, the converter device comprises a plurality of converter modules;
step 305 comprises:
calculating the equivalent voltage output by the converter equipment according to the input power, the output current and a preset formula;
the preset formula is as follows:
wherein, U represents the equivalent voltage, P represents the input power, η represents the preset voltage conversion efficiency, n represents the number of the current transformation modules in the current transformation equipment, and I represents the output current.
In this embodiment, the preset voltage conversion efficiency is used to calculate the output power corresponding to the input power under normal conditions, and then the monitoring device calculates the equivalent voltage corresponding to the input power based on the output power.
In some embodiments, the separately determining whether the input current and the output current of the power supply system are abnormal includes:
acquiring input power, output power, input voltage, output voltage, input current and output current of a power supply system;
calculating a first input current of the power supply system based on the input power and the input voltage of the power supply system;
calculating a first output current of the power supply system based on the output power and the output voltage of the power supply system;
if the difference between the first input current and the input current of the power supply system is smaller than a first current threshold value, judging that the input current of the power supply system is normal;
if the difference between the first input current and the input current of the power supply system is not smaller than the first current threshold, judging that the input current of the power supply system is abnormal;
if the difference between the first output current and the output current of the power supply system is smaller than a second current threshold value, judging that the output current of the power supply system is normal;
and if the difference between the first output current and the output current of the power supply system is not less than the second current threshold, judging that the output current of the power supply system is abnormal.
In this embodiment, the directly obtained input current and output current of the power supply system are the actual input current and actual output current of the power supply system, the calculated first input current of the power supply system represents the theoretical value of the input current of the power supply system, and the first output current of the power supply system represents the theoretical value of the output current of the power supply system.
In this embodiment, it is determined whether the actual input current and the actual output current of the power supply system are close to the corresponding theoretical values, so as to assist in determining whether the converter device has a fault. If the input current and the output current are abnormal, the converter equipment possibly has a fault.
The method provided by the embodiment of the invention comprises the following steps: acquiring bus voltage detected by a bus voltage detection module; acquiring input power detected by an input detection module; acquiring the output voltage of the converter equipment; acquiring the output current of the converter equipment; calculating the equivalent voltage output by the converter equipment according to the input power and the output current; and comparing the bus voltage, the output voltage and the equivalent voltage, and determining the fault of the power supply system according to the comparison result. The embodiment of the invention compares the voltages of three sources in the power supply system, can determine whether the power supply system has faults or not based on the comparison result, and can determine the fault position in the power supply system based on the source corresponding to the abnormal voltage.
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. 8 is a schematic structural diagram of a fault diagnosis device of a power supply system according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 8, the failure diagnosis device 8 of the power supply system includes:
a first obtaining module 81, configured to obtain the bus voltage detected by the bus voltage detecting module;
a second obtaining module 82, configured to obtain the input power detected by the input detecting module;
a third obtaining module 83, configured to obtain an output voltage of the converter;
a fourth obtaining module 84, configured to obtain an output current of the converter device;
the calculating module 85 is used for calculating the equivalent voltage output by the converter equipment according to the input power and the output current;
and the comparison module 86 is used for comparing the bus voltage, the output voltage and the equivalent voltage and determining the diagnosis result of the power supply system according to the comparison result.
In some embodiments, the power supply system comprises a dc power supply system, the inverter device comprises a rectifier device, and the input detection module comprises an ac input detection module;
the bus voltage comprises a direct current bus voltage; the input power comprises alternating current input power;
the first obtaining module 81 is specifically configured to:
acquiring direct-current bus voltage detected by a bus voltage detection module;
the second obtaining module 82 is specifically configured to:
acquiring alternating current input power detected by an alternating current input detection module;
the third obtaining module 83 is specifically configured to:
acquiring the output voltage of the rectifying equipment;
the fourth obtaining module 84 is specifically configured to:
acquiring output current of a rectifying device;
the calculation module 85 is specifically configured to:
calculating the direct current equivalent voltage output by the rectifying equipment according to the alternating current input power and the output current;
the comparison module 86 is specifically configured to:
and comparing the direct current bus voltage, the output voltage and the direct current equivalent voltage, and determining the diagnosis result of the direct current power supply system according to the comparison result.
In some embodiments, the comparison module 86 includes:
the first comparison unit is used for comparing the bus voltage with the output voltage;
and the diagnosis unit is used for judging that the diagnosis result of the power supply system is a first result when the absolute value of the difference between the bus voltage and the output voltage is not greater than a first preset threshold value.
In some embodiments, the comparison module 86 further comprises:
the second comparison unit is used for comparing the output voltage with the equivalent voltage when the absolute value of the difference between the bus voltage and the output voltage is greater than a first preset threshold value;
the diagnosis unit is further used for judging that the diagnosis result of the power supply system is a second result when the absolute value of the difference between the output voltage and the equivalent voltage is not larger than a second preset threshold.
In some embodiments, the comparison module 86 further comprises:
the third comparison unit is used for comparing the bus voltage with the equivalent voltage when the absolute value of the difference between the output voltage and the equivalent voltage is greater than a second preset threshold;
the diagnosis unit is further used for judging that the diagnosis result of the power supply system is a third result when the absolute value of the difference between the bus voltage and the equivalent voltage is not larger than a third preset threshold.
In some embodiments, the comparison module 86 further comprises:
the current judging unit is used for respectively judging whether the input current and the output current of the power supply system are abnormal or not when the absolute value of the difference between the bus voltage and the equivalent voltage is not larger than a third preset threshold;
the diagnosis unit is also used for judging that the diagnosis result of the power supply system is a third result when the input current and/or the output current of the power supply system are abnormal;
when the input current and the output current of the power supply system are both normal, the diagnosis result of the power supply system is determined to be a first result.
In some embodiments, the converter device comprises a plurality of converter modules;
the calculation module 85 is specifically configured to:
calculating the equivalent voltage output by the converter equipment according to the input power, the output current and a preset formula;
the preset formula is as follows:
wherein, U represents the equivalent voltage, P represents the input power, η represents the preset voltage conversion efficiency, n represents the number of the current transformation modules in the current transformation equipment, and I represents the output current.
In some embodiments, the current determination unit is specifically configured to:
acquiring input power, output power, input voltage, output voltage, input current and output current of a power supply system;
calculating a first input current of the power supply system based on the input power and the input voltage of the power supply system;
calculating a first output current of the power supply system based on the output power and the output voltage of the power supply system;
if the difference between the first input current and the input current of the power supply system is smaller than a first current threshold value, judging that the input current of the power supply system is normal;
if the difference between the first input current and the input current of the power supply system is not smaller than the first current threshold, judging that the input current of the power supply system is abnormal;
if the difference between the first output current and the output current of the power supply system is smaller than a second current threshold value, judging that the output current of the power supply system is normal;
and if the difference between the first output current and the output current of the power supply system is not less than the second current threshold, judging that the output current of the power supply system is abnormal.
The embodiment of the invention provides a fault diagnosis device of a power supply system, which comprises: the first acquisition module is used for acquiring the bus voltage detected by the bus voltage detection module; the second acquisition module is used for acquiring the input power detected by the input detection module; the third acquisition module is used for acquiring the output voltage of the converter equipment; the fourth acquisition module is used for acquiring the output current of the converter equipment; the computing module is used for computing the equivalent voltage output by the converter equipment according to the input power and the output current; and the comparison module is used for comparing the bus voltage, the output voltage and the equivalent voltage and determining the diagnosis result of the power supply system according to the comparison result. The embodiment of the invention compares the voltages of three sources in the power supply system, can determine whether the power supply system has faults or not based on the comparison result, and can determine the fault position in the power supply system based on the source corresponding to the abnormal voltage.
Fig. 9 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 9, the terminal 9 of this embodiment includes: a processor 90, a memory 91 and a computer program 92 stored in said memory 91 and executable on said processor 90. The processor 90, when executing the computer program 92, implements the steps in the above-described embodiments of the fault diagnosis method for each power supply system, such as the steps 301 to 306 shown in fig. 3. Alternatively, the processor 90, when executing the computer program 92, implements the functions of the modules in the device embodiments, such as the functions of the modules 81 to 586 shown in fig. 8.
Illustratively, the computer program 92 may be partitioned into one or more modules that are stored in the memory 91 and executed by the processor 90 to implement the present invention. The one or more modules 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 92 in the terminal 9. For example, the computer program 92 may be divided into the modules 81 to 56 shown in fig. 8.
The terminal 9 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal 9 may include, but is not limited to, a processor 90, a memory 91. It will be appreciated by those skilled in the art that fig. 9 is only an example of a terminal 9 and does not constitute a limitation of the terminal 9 and may comprise more or less components than those shown, or some components may be combined, or different components, for example the terminal may further comprise input output devices, network access devices, buses, etc.
The Processor 90 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 memory 91 may be an internal storage unit of the terminal 9, such as a hard disk or a memory of the terminal 9. The memory 91 may also be an external storage device of the terminal 9, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 9. Further, the memory 91 may also include both an internal storage unit and an external storage device of the terminal 9. The memory 91 is used for storing the computer program and other programs and data required by the terminal. The memory 91 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/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal 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 implemented, for example, a plurality of units or components may be combined or may be 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 module, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above may 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 embodiments of the fault diagnosis method of the power supply system described above 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 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.
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. The fault diagnosis method of the power supply system is characterized in that the power supply system comprises converter equipment and monitoring equipment, wherein the monitoring equipment comprises a bus voltage detection module and an input detection module;
the method comprises the following steps:
acquiring bus voltage detected by a bus voltage detection module;
acquiring input power detected by an input detection module;
acquiring the output voltage of the converter equipment;
acquiring the output current of the converter equipment;
calculating the equivalent voltage output by the converter equipment according to the input power and the output current;
and comparing the bus voltage, the output voltage and the equivalent voltage, and determining a diagnosis result of the power supply system according to a comparison result.
2. The method according to claim 1, wherein the power supply system includes a dc power supply system, the inverter device includes a rectifier device, and the input detection module includes an ac input detection module;
the bus voltage comprises a direct current bus voltage; the input power comprises alternating current input power;
the bus voltage that obtains bus voltage detection module detection includes:
acquiring direct-current bus voltage detected by a bus voltage detection module;
the obtaining of the input power detected by the input detection module includes:
acquiring alternating current input power detected by an alternating current input detection module;
the acquiring the output voltage of the variable current device comprises the following steps:
acquiring the output voltage of the rectifying equipment;
the obtaining of the output current of the variable current device comprises:
acquiring the output current of the rectifying equipment;
the calculating the equivalent voltage output by the converter device according to the input power and the output current comprises:
calculating the direct current equivalent voltage output by the rectifying equipment according to the alternating current input power and the output current;
the comparing the bus voltage, the output voltage, and the equivalent voltage, and determining a diagnostic result of the power supply system according to the comparison result includes:
and comparing the direct current bus voltage, the output voltage and the direct current equivalent voltage, and determining a diagnosis result of the direct current power supply system according to a comparison result.
3. The method according to claim 1, wherein the comparing the bus voltage, the output voltage, and the equivalent voltage, and the determining the fault of the power supply system according to the comparison result includes:
comparing the bus voltage with the output voltage;
and if the absolute value of the difference between the bus voltage and the output voltage is not greater than a first preset threshold, determining that the diagnosis result of the power supply system is a first result.
4. The method for fault diagnosis of a power supply system according to claim 3, characterized in that the method further comprises:
if the absolute value of the difference between the bus voltage and the output voltage is greater than a first preset threshold value, comparing the output voltage with the equivalent voltage;
and if the absolute value of the difference between the output voltage and the equivalent voltage is not greater than a second preset threshold, determining that the diagnosis result of the power supply system is a second result.
5. The method for fault diagnosis of a power supply system according to claim 4, characterized in that the method further comprises:
if the absolute value of the difference between the output voltage and the equivalent voltage is greater than a second preset threshold value, comparing the bus voltage with the equivalent voltage;
and if the absolute value of the difference between the bus voltage and the equivalent voltage is greater than a third preset threshold, determining that the diagnosis result of the power supply system is a third result.
6. The method for fault diagnosis of a power supply system according to claim 5, characterized in that the method further comprises:
if the absolute value of the difference between the bus voltage and the equivalent voltage is not greater than a third preset threshold, respectively judging whether the input current and the output current of the power supply system are abnormal;
if the input current and/or the output current of the power supply system are abnormal, judging that the diagnosis result of the power supply system is a third result;
and if the input current and the output current of the power supply system are normal, judging that the diagnosis result of the power supply system is a first result.
7. The method according to any one of claims 1 to 6, wherein the converter device comprises a plurality of converter modules;
the calculating the equivalent voltage output by the converter device according to the input power and the output current comprises:
calculating the equivalent voltage output by the converter equipment according to the input power, the output current and a preset formula;
the preset formula is as follows:
wherein U represents the equivalent voltage, P represents the input power, η represents a preset voltage conversion efficiency, n represents the number of converter modules in the converter device, and I represents the output current.
8. The method according to claim 5, wherein the separately determining whether the input current and the output current of the power supply system are abnormal includes:
acquiring input power, output power, input voltage, output voltage, input current and output current of the power supply system;
calculating a first input current of the power supply system based on an input power and an input voltage of the power supply system;
calculating a first output current of the power supply system based on the output power and the output voltage of the power supply system;
if the difference between the first input current and the input current of the power supply system is smaller than a first current threshold value, judging that the input current of the power supply system is normal;
if the difference between the first input current and the input current of the power supply system is not smaller than a first current threshold, judging that the input current of the power supply system is abnormal;
if the difference between the first output current and the output current of the power supply system is smaller than a second current threshold, judging that the output current of the power supply system is normal;
and if the difference between the first output current and the output current of the power supply system is not less than a second current threshold, judging that the output current of the power supply system is abnormal.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method for diagnosing a fault of a dc power supply system as claimed in any one of claims 1 to 8 above when executing the computer program.
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 for diagnosing faults of a dc power supply system as set forth in any one of claims 1 to 8 above.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197188A (en) * | 2013-03-05 | 2013-07-10 | 上海翼锐汽车科技有限公司 | Battery current sensor fault diagnosis system and method thereof |
| WO2014078904A1 (en) * | 2012-11-23 | 2014-05-30 | Elevare Energy Ip Pty Ltd | Electrical supply system |
| CN104297631A (en) * | 2014-09-28 | 2015-01-21 | 上海金智晟东电力科技有限公司 | Fault diagnosis device and diagnosis and maintenance method for ring main unit power distribution terminal |
| KR20190086967A (en) * | 2018-01-15 | 2019-07-24 | 주식회사 엘지화학 | Battery management system and method for diagnosing a fault of a busbar |
| CN110221145A (en) * | 2019-06-03 | 2019-09-10 | 国家电网有限公司 | Fault Diagnosis for Electrical Equipment method, apparatus and terminal device |
| CN110632912A (en) * | 2019-10-17 | 2019-12-31 | 浙江正泰中自控制工程有限公司 | DCS power system fault diagnosis method |
| CN111431269A (en) * | 2020-04-24 | 2020-07-17 | 科华恒盛股份有限公司 | Data center power supply system and corresponding control method |
| CN112510768A (en) * | 2020-11-24 | 2021-03-16 | 优刻得科技股份有限公司 | Power supply system |
| CN113282000A (en) * | 2021-04-30 | 2021-08-20 | 科华数据股份有限公司 | Fault diagnosis method and device of data center and dynamic loop monitoring system |
| CN113391165A (en) * | 2021-06-18 | 2021-09-14 | 湖南科壹电气有限公司 | Power distribution network fault diagnosis method and monitoring system |
-
2021
- 2021-10-28 CN CN202111265705.2A patent/CN114089057A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014078904A1 (en) * | 2012-11-23 | 2014-05-30 | Elevare Energy Ip Pty Ltd | Electrical supply system |
| CN103197188A (en) * | 2013-03-05 | 2013-07-10 | 上海翼锐汽车科技有限公司 | Battery current sensor fault diagnosis system and method thereof |
| CN104297631A (en) * | 2014-09-28 | 2015-01-21 | 上海金智晟东电力科技有限公司 | Fault diagnosis device and diagnosis and maintenance method for ring main unit power distribution terminal |
| KR20190086967A (en) * | 2018-01-15 | 2019-07-24 | 주식회사 엘지화학 | Battery management system and method for diagnosing a fault of a busbar |
| CN110221145A (en) * | 2019-06-03 | 2019-09-10 | 国家电网有限公司 | Fault Diagnosis for Electrical Equipment method, apparatus and terminal device |
| CN110632912A (en) * | 2019-10-17 | 2019-12-31 | 浙江正泰中自控制工程有限公司 | DCS power system fault diagnosis method |
| CN111431269A (en) * | 2020-04-24 | 2020-07-17 | 科华恒盛股份有限公司 | Data center power supply system and corresponding control method |
| CN112510768A (en) * | 2020-11-24 | 2021-03-16 | 优刻得科技股份有限公司 | Power supply system |
| CN113282000A (en) * | 2021-04-30 | 2021-08-20 | 科华数据股份有限公司 | Fault diagnosis method and device of data center and dynamic loop monitoring system |
| CN113391165A (en) * | 2021-06-18 | 2021-09-14 | 湖南科壹电气有限公司 | Power distribution network fault diagnosis method and monitoring system |
Non-Patent Citations (2)
| Title |
|---|
| 刘雄航 等: "基于PLC的船用光伏并网能量管理***设计", 《中国修船》, no. 05, 1 October 2020 (2020-10-01) * |
| 陈金木 等: "变电站直流电源***便携式电能质量检测仪研制", 《仪表技术与传感器》, no. 03, 15 March 2019 (2019-03-15) * |
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