CN114217112A - Method, device, equipment and medium for detecting three-phase unbalance fault of starting resistor - Google Patents
Method, device, equipment and medium for detecting three-phase unbalance fault of starting resistor Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a medium for detecting three-phase unbalance faults of a starting resistor, wherein the method comprises the steps of detecting real-time effective values of all phases of currents of a three-phase starting resistor of a flexible direct current system; calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current; and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault. Whether the resistance value of each phase of starting resistor is normal or not is judged by measuring the relative size of the effective value of each phase of current on each phase of starting resistor, so that the three-phase unbalanced fault of the starting resistor can be detected in time.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a method, a device, equipment and a medium for detecting a three-phase unbalance fault of a starting resistor.
Background
The starting resistor of the flexible direct current system is important equipment of the flexible direct current system, the starting resistor is put into use when the flexible direct current system is started, after the alternating current breaker is closed, the alternating current power supply charges the uncontrolled rectification of the flexible direct current converter valve through the starting resistor, and after the charging is finished, the bypass isolating switch connected with the starting resistor in parallel is closed to bypass the starting resistor.
In order to keep the three-phase starting balance of the flexible direct current system, the resistance values of the three-phase starting resistors are generally set to be the same. After the alternating current circuit breaker is closed, the voltage and the current on the three-phase starting resistor rapidly rise to the maximum value and then gradually decrease until the uncontrolled charging is finished.
If the flexible direct current system is started each time due to the internal short circuit defect of each phase of starting resistor, the starting resistor is short-circuited in a small range at the weak insulation position, but the system can still be started normally due to the small short-circuited resistance value; therefore, the unbalanced fault of the three-phase starting resistor is difficult to find, the defect of the equipment is enlarged after the short circuit of the starting resistor in a small range for many times, and the equipment is developed into an obvious short circuit and damaged.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a medium for detecting a three-phase unbalance fault of a starting resistor, which can detect the three-phase unbalance fault of the starting resistor in time and avoid fault expansion.
An embodiment of the present invention provides a method for detecting a three-phase imbalance fault of a starting resistor, including:
detecting real-time effective values of all phase currents of a three-phase starting resistor of the flexible direct current system;
calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault.
As a preferable mode, the calculating a real-time dynamic non-uniformity coefficient of the flexible direct current system according to the effective value of each phase current specifically includes:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
Preferably, the calculating process of the uneven coefficient threshold specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating a maximum peak current I at a starting resistance of the flexible DC systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
The embodiment of the invention also provides a device for detecting the three-phase unbalance fault of the starting resistor, which comprises the following components: the device comprises a current detection module, an uneven coefficient calculation module and a judgment module;
the current detection module is used for detecting real-time effective values of all phases of current of a three-phase starting resistor of the flexible direct current system;
the uneven coefficient calculation module is used for calculating the real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
the judging module is used for judging that the three-phase unbalance fault occurs in the starting resistor when the dynamic uneven coefficient is larger than the uneven coefficient threshold of the pre-calculated three-phase current.
Preferably, the uneven coefficient calculation module is specifically configured to:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
Preferably, the calculating process of the uneven coefficient threshold specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating a maximum peak current I at a starting resistance of the flexible DC systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
The embodiment of the present invention further provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the method for detecting a three-phase imbalance fault of a starting resistor as described in any one of the above embodiments is implemented.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for detecting a three-phase imbalance fault of a starting resistor according to any one of the above embodiments.
The invention provides a method, a device, equipment and a medium for detecting three-phase unbalance faults of a starting resistor, which are characterized in that effective values of all phases of current in real time of the three-phase starting resistor of a flexible direct current system are detected; calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current; and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault. Whether the resistance value of each phase of starting resistor is normal or not is judged by measuring the relative size of the effective value of each phase of current on each phase of starting resistor, so that the three-phase unbalanced fault of the starting resistor can be detected in time.
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Fig. 1 is a schematic flowchart of a method for detecting a three-phase imbalance fault of a starting resistor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection apparatus for a three-phase imbalance fault of a starting resistor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
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.
The embodiment of the present invention provides a method for detecting a three-phase unbalanced fault of a starting resistor, and referring to fig. 1, the method is a schematic flow chart of the method for detecting a three-phase unbalanced fault of a starting resistor provided in the embodiment of the present invention, and includes steps S101 to S103:
s101, detecting real-time effective values of all phase currents of a three-phase starting resistor of the flexible direct current system;
s102, calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
s103, when the dynamic uneven coefficient is larger than the uneven coefficient threshold value of the pre-calculated three-phase current, judging that the three-phase unbalance fault occurs in the starting resistor.
In this embodiment, in a starting process of the flexible dc system, detecting an effective value of each real-time phase current of the three-phase starting resistor, specifically, detecting an effective value of each real-time phase current of each starting resistor in a starting process of the three-phase starting resistor;
calculating a real-time dynamic uneven coefficient in the starting process of the flexible tributary system according to the recorded effective value of each phase current;
and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault.
The relative size of the effective value of each phase current on each phase starting resistor is measured to judge whether the resistance value of each phase starting resistor is normal or not, so that the abnormity of a certain phase resistance value can be detected. And the method is easier to find small-amplitude abnormity than current absolute value judgment, and is beneficial to finding problems in time.
The invention provides a method for detecting three-phase unbalance faults of a starting resistor, which is used for detecting real-time effective values of all phases of current of a three-phase starting resistor of a flexible direct-current system; calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current; and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault. Whether the resistance value of each phase of starting resistor is normal or not is judged by measuring the relative size of the effective value of each phase of current on each phase of starting resistor, so that the three-phase unbalanced fault of the starting resistor can be detected in time.
In another embodiment provided by the present invention, the step S102 specifically includes:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
In the embodiment, the real-time current maximum value I on the starting resistor in the three phases at the same time t in the real-time effective values of the currents of the various phases is counted according to the real-time effective value of the three phases of the currentmax(t) and the real-time current maximum Imin(t) according to the formula α (t) Imax(t)/Imin(t) the dynamic unevenness coefficient at different time t is calculated, and α dynamically changes with time, so that the dynamic unevenness coefficient is called dynamic unevenness coefficient.
By detecting the effective value of each phase current in real time and calculating the dynamic uneven coefficient in real time, the real-time detection of the three-phase unbalanced fault of the starting resistor can be realized.
In another embodiment provided by the present invention, the step S103 specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating the maximum peak current I of the starting resistance value of the flexible direct current systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
In the specific implementation of this embodiment, the rated resistance value R of the three-phase starting resistor of the flexible direct-current system may be specifically obtained by querying configuration information of the three-phase resistor, and the rated resistance values of the three-phase starting resistor of the flexible direct-current system are initially set to be the same, but when different resistors are manufactured, a natural allowable deviation σ exists in the process;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；Rmax＝R+σ；Rmin＝R-σ；
Assuming extreme cases, in a three-phase starting resistor: the resistance value of the one-phase starting resistor is RminThe resistance of the other two starting resistors is Rmax(ii) a Or the two-phase starting resistor has a resistance value of RminThe resistance value of another phase starting resistor is Rmax。
The method can calculate each phase current on the starting resistor under natural deviation through simulation, and calculate the maximum peak current I under extreme conditionsmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
When alpha is>α0And when the starting resistor has a three-phase unbalance fault, the system gives an alarm, and an operator can overhaul and maintain the starting resistor according to the alarm condition, so that the accident expansion is avoided.
It should be noted that the invention can also calculate the uneven coefficient threshold alpha of different three-phase currents according to the unbalanced condition of the resistance values of various resistors％～αNAnd setting a plurality of alarm levels according to the severity, and realizing alarm of a plurality of alarm levels according to the size relationship between the dynamic uneven coefficient and different uneven coefficient threshold values.
The method is used for detecting the three-phase unbalance fault of the starting resistor by calculating the three-phase non-uniform coefficient threshold, generally speaking, the resistance value of the starting resistor is constant after the manufacturing of the starting resistor is finished, the resistance value can not be obviously increased or reduced under the non-fault condition, and the range (R) is not exceededmin～Rmax). And the resistance values of the resistors with different short-circuit faultsPossibly in the range of 0 to RminAnd (3) removing the solvent. Under the condition of short circuit fault of one phase of resistance, the non-uniform coefficient alpha of three-phase current is greater than alpha0. And realizing three-phase unbalance fault detection.
The embodiment of the invention provides a method for detecting three-phase unbalance faults of a starting resistor, which is used for detecting real-time effective values of all phases of current of a three-phase starting resistor of a flexible direct-current system; calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current; and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault. Whether the resistance value of each phase of starting resistor is normal or not is judged by measuring the relative size of the effective value of each phase of current on each phase of starting resistor, so that the three-phase unbalanced fault of the starting resistor can be detected in time.
An embodiment of the present invention further provides a detection apparatus for a three-phase imbalance fault of a starting resistor, which is shown in fig. 2 and is a schematic structural diagram of the detection apparatus for a three-phase imbalance fault of a starting resistor provided in the embodiment of the present invention, where the apparatus includes: the device comprises a current detection module, an uneven coefficient calculation module and a judgment module;
the current detection module is used for detecting real-time effective values of all phases of current of a three-phase starting resistor of the flexible direct current system;
the uneven coefficient calculation module is used for calculating the real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
the judging module is used for judging that the three-phase unbalance fault occurs in the starting resistor when the dynamic uneven coefficient is larger than the uneven coefficient threshold of the pre-calculated three-phase current.
In another embodiment of the present invention, the uneven coefficient calculating module is specifically configured to:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
In another embodiment provided by the present invention, the calculating process of the uneven coefficient threshold specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating a maximum peak current I at a starting resistance of the flexible DC systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
It should be noted that specific functions of each module of the detection apparatus for detecting a three-phase imbalance fault of a starting resistor provided in this embodiment are specifically described in the foregoing embodiment, and are not described herein again.
Fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a startup resistance three phase imbalance fault detection program. When the processor executes the computer program, the steps in the above-mentioned embodiments of the method for detecting a three-phase imbalance fault of the starting resistor are implemented, for example, the step shown in fig. 1 is a method for detecting a three-phase imbalance fault of the starting resistor. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program, for example, a device for detecting a three-phase imbalance fault of a starting resistor.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device. For example, the computer program may be divided into a current detection module, an uneven coefficient calculation module and a determination module, and specific functions of the modules are not described herein.
The terminal device can be a desktop computer, a notebook, a palm computer, a cloud server and other computing devices. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine certain components, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 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 device, discrete hardware component, or the like. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is the control center of the terminal device and connects the various parts of the whole terminal device using various interfaces and lines.
The memory may be used for storing the computer programs and/or modules, and the processor may implement various functions of the terminal device by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the terminal device integrated module/unit can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The invention provides a method, a device, equipment and a medium for detecting three-phase unbalance faults of a starting resistor, wherein the method comprises the steps of detecting real-time effective values of all phases of currents of a three-phase starting resistor of a flexible direct current system; calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current; and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault. Whether the resistance value of each phase of starting resistor is normal or not is judged by measuring the relative size of the effective value of each phase of current on each phase of starting resistor, so that the three-phase unbalanced fault of the starting resistor can be detected in time.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method for detecting a three-phase unbalance fault of a starting resistor is characterized by comprising the following steps:
detecting real-time effective values of all phase currents of a three-phase starting resistor of the flexible direct current system;
calculating a real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
and when the dynamic non-uniformity coefficient is larger than the pre-calculated non-uniformity coefficient threshold value of the three-phase current, judging that the starting resistor has a three-phase imbalance fault.
2. The method according to claim 1, wherein the calculating a real-time dynamic non-uniformity coefficient of the flexible dc system according to the effective value of each phase current includes:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
3. The method for detecting a three-phase imbalance fault of a starting resistor according to claim 1, wherein the calculation process of the uneven coefficient threshold specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating a maximum peak current I at a starting resistance of the flexible DC systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
4. A detection device for a three-phase unbalance fault of a starting resistor is characterized by comprising: the device comprises a current detection module, an uneven coefficient calculation module and a judgment module;
the current detection module is used for detecting real-time effective values of all phases of current of a three-phase starting resistor of the flexible direct current system;
the uneven coefficient calculation module is used for calculating the real-time dynamic uneven coefficient of the flexible direct current system according to the effective value of each phase current;
the judging module is used for judging that the three-phase unbalance fault occurs in the starting resistor when the dynamic uneven coefficient is larger than the uneven coefficient threshold of the pre-calculated three-phase current.
5. The starting resistor three-phase imbalance fault detection device of claim 4, wherein the non-uniformity coefficient calculation module is specifically configured to:
counting the real-time current maximum value I in the effective values of the currents of each phase at the moment tmax(t) and the real-time current minimum Imin(t)；
Calculating the dynamic non-uniformity coefficient alpha (t) as Imax(t)/Imin(t)。
6. The apparatus for detecting a three-phase imbalance fault in a starting resistor according to claim 4, wherein the calculating process of the threshold value of the non-uniformity coefficient specifically includes:
obtaining a rated resistance value R and a natural allowable deviation sigma of a three-phase starting resistor of the flexible direct current system;
calculating the maximum value R of the theoretical starting resistance of the three-phase starting resistance according to the rated resistance R and the natural allowable deviation sigmamaxAnd the theoretical starting resistance minimum value Rmin；
Simulating a maximum peak current I at a starting resistance of the flexible DC systemmax0And minimum peak current Imin0；
Calculating the non-uniformity coefficient threshold value alpha0＝Imax0/Imin0。
7. A terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing a method of detecting a startup resistance three-phase imbalance fault as claimed in any one of claims 1 to 3 when executing the computer program.
8. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls an apparatus to execute a method for detecting a three-phase imbalance fault of a starting resistor according to any one of claims 1 to 3.
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