CN112083348B - Method, system and storage medium for detecting single-phase to ground short circuit of motor - Google Patents
Method, system and storage medium for detecting single-phase to ground short circuit of motor Download PDFInfo
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/08—Measuring resistance by measuring both voltage and current
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
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- 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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- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
The invention discloses a method, a system and a storage medium for detecting a single-phase to-ground short circuit of a motor, wherein the method for detecting the single-phase to-ground short circuit of the motor comprises the following steps: acquiring characteristic parameters of a motor and a motor controller; a fault threshold value calculated according to the characteristic parameters; the method comprises the steps of controlling a switching device in a motor controller to be conducted or closed according to a preset rule, and detecting a test current during the action of the switching device; and judging whether the motor of the electric automobile is in single-phase short circuit to ground or not according to the fault threshold value and the magnitude of the test current. The invention aims to reduce the detection cost of the single-phase ground short circuit of the motor of the electric automobile and improve the detection effect of the single-phase ground short circuit of the motor of the electric automobile.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a method, a system and a storage medium for detecting single-phase to ground short circuit of a motor.
Background
The electric automobile is a vehicle which uses a vehicle-mounted power supply as power and uses a motor to drive wheels to run and meets various requirements of road traffic and safety regulations. Compared with the traditional automobile, the electric automobile has a good application prospect because of smaller influence on the environment.
In the electric automobile industry, the insulation detection method of a vehicle-mounted motor mainly comprises two types: insulation detector and automatically controlled self-checking. The whole vehicle factory generally detects the whole vehicle level through equipment such as an insulation detector, but the whole vehicle factory generally also requires a motor controller to be capable of self-identifying whether a single-phase short circuit to ground occurs.
For the existing self-checking scheme, the three-phase current unbalance method and the Y-capacitor (namely the safety capacitor) voltage sampling method are mainly used for identification. The three-phase current unbalance method is based on the principle of distinguishing the sum of three-phase current of motor. When the motor is short-circuited relative to the casing, the sum of three-phase currents is not zero due to the existence of leakage current. And when the short circuit phenomenon does not occur, the sum of three-phase currents of the motor is 0.
The three-phase current unbalance method is simple, but the method is seriously dependent on the accuracy of a current sampling link and the current battery voltage allowance, and only when the carrier frequency of the sampling link is higher and the battery voltage is more, the three-phase current of the real short ground can be acquired as much as possible, namely, the phenomenon of false alarm or missing alarm caused by short circuit current which is easy to acquire under the conditions of low carrier frequency and low bus voltage can be avoided, so the method adds great difficulty to the setting of the fault threshold value.
The Y capacitor voltage sampling method is to collect the characteristic quantity of the Y capacitor voltage in real time to detect, and when the short circuit occurs relative to the shell, the terminal voltage of the Y capacitor fluctuates, and the protection threshold is designed according to the fluctuation quantity to identify.
The Y capacitor voltage sampling method generally requires an additional Y capacitor voltage sampling circuit and requires re-board arrangement, which brings great cost pressure to the motor controller.
Disclosure of Invention
The embodiment of the application aims to reduce the detection cost of the single-phase ground short circuit of the electric automobile motor and improve the detection effect of the single-phase ground short circuit of the electric automobile motor by providing the detection method, the system and the computer readable storage medium of the single-phase ground short circuit of the motor.
The embodiment of the application provides a method for detecting a single-phase to-ground short circuit of a motor, which is characterized by comprising the following steps:
acquiring characteristic parameters of a motor and a motor controller;
calculating a fault threshold according to the characteristic parameters;
controlling a switching device in the motor controller to be conducted or closed according to a preset rule, and detecting the test current of the switching device in the action period;
and judging whether the motor is in single-phase to ground short circuit or not according to the fault threshold value and the magnitude of the test current.
In some embodiments, the obtaining the characteristic parameters of the motor and the motor controller includes:
acquiring the phase resistance value of the motor;
reading bus voltage, dead time and carrier frequency; and
and reading the conduction voltage drop of the safety capacitor and the switching device in the motor controller.
In some embodiments, the obtaining the phase resistance value of the motor includes:
the upper bridge switch of any phase, such as a U-phase upper bridge switch device, and the lower bridge switch devices of other phases, such as a W-phase lower bridge switch device, are conducted, the duty ratio is continuously adjusted, when the current in the loop is detected to reach a set threshold value, the output voltage is calculated through the bus voltage and the duty ratio, and the phase resistance value of the motor is obtained according to the ratio of the output voltage and the current.
In some embodiments, the bus voltage, the dead time, and the carrier frequency are read by sampling circuitry or sensors in the motor controller.
In some embodiments, the fault threshold is a freewheel current threshold in the motor controller loop.
In some embodiments, the switching device in the motor controller is turned on or off according to a preset rule, and the detecting the test current during the action of the switching device includes:
and keeping a constant duty ratio, switching on any phase upper bridge switching device, such as a U-phase upper bridge switching device, in the first half carrier period, switching on other phase lower bridge switching devices, such as a V-phase lower bridge switching device and a W-phase lower bridge switching device, in the second half carrier period, and detecting the test current in the loop.
In some embodiments, determining whether the motor is shorted to ground in a single phase based on the fault threshold and the test current comprises:
and if the test current is larger than the fault threshold value and the accumulated value of the test current larger than the fault threshold value reaches a set threshold value, judging that the motor is in single-phase ground short circuit.
In some embodiments, the set threshold is a duration threshold or a number of detections threshold.
The application also provides a system for detecting the single-phase ground short circuit of the motor, which comprises a processor, a memory and a system control program stored on the memory and capable of running on the processor, wherein the system control program realizes the steps of the method for detecting the single-phase ground short circuit of the motor when being executed by the processor.
The application also provides a computer readable storage medium, wherein a system control program is stored on the computer readable storage medium, and the system control program realizes the steps of the motor single-phase to ground short circuit detection method when being executed by a processor.
According to the method, the fault threshold value is obtained through calculation of the characteristic parameters of the motor and the motor controller, the test current flowing through the switching device in the motor controller, such as the follow current flowing through the switching device, is detected, and whether the motor of the electric automobile is in single-phase to-ground short circuit is judged according to the fault threshold value and the test current. Compared with the traditional unbalanced method of three-phase current, the method has the advantages that due to the limitation of current sampling bandwidth, high-frequency current cannot be acquired under the conditions of low carrier frequency and low bus voltage, the acquired three-phase current is zero, and the phenomenon of single-phase ground short circuit false alarm or missing alarm occurs, so that the occurrence of single-phase ground short circuit cannot be accurately measured. The detection of the low-frequency follow current, such as the detection of the test current flowing through the switching device in the motor controller, is easier to collect and detect than the high-frequency current, is not easy to make mistakes, and improves the detection effect of the single-phase ground short circuit of the electric automobile motor. In addition, the cost of detecting the single-phase to ground short circuit of the electric automobile motor can be reduced without adding an additional hardware circuit.
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FIG. 1 is a flow chart of a method of detecting a single phase to ground short of a motor of the present invention;
fig. 2 shows a schematic circuit diagram of an inverter of a motor controller of a typical electric vehicle.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the new energy electric automobile, the phenomena of damage and abnormal motor insulation occur when the motor three-phase output cable (or the motor controller three-phase output cable, and the motor three-phase output cable and the motor controller three-phase output cable form two ends of the cable). Once the phenomenon occurs in operation, the phenomenon that the whole vehicle shakes and even unexpected accelerating force occurs due to the divergence of motor control is easy, so that extremely bad experience is brought to drivers and passengers, and even potential safety hazards are brought to the passengers.
In the existing self-checking scheme of the motor controller, the defect of false alarm or missing alarm occurs because the three-phase current unbalance method has low carrier frequency and short circuit current is not easily collected under low bus voltage, and the cost increase caused by the additional Y capacitor voltage sampling circuit is required by the Y capacitor voltage sampling method. Therefore, a self-checking scheme is needed for reducing the detection cost of the single-phase ground short circuit of the electric automobile motor while improving the detection effect of the single-phase ground short circuit of the electric automobile motor. In view of this, the present application proposes a method, a system and a storage medium for detecting a single-phase to ground short circuit of a motor. The following is an explanation by way of two examples.
Example 1
The embodiment of the application provides a detection method for a single-phase to ground short circuit of a motor, which comprises the following steps:
s10, obtaining characteristic parameters of a motor and a motor controller;
the motor controller refers to a controller used for working for a motor for driving the electric automobile in the electric automobile. The motor controller includes an inverter. The inverter is used for receiving direct current electric energy transmitted by the storage battery of the electric automobile and inverting the direct current electric energy into three-phase alternating current to provide power for the motor of the automobile. The characteristic parameters are physical parameters displayed corresponding to the working conditions of the current motor and the electric controller, and the characteristic parameters generally comprise a plurality of characteristic parameters.
S20, calculating a fault threshold according to the characteristic parameters;
the fault threshold is a parameter threshold obtained by the characteristic parameters according to a solving expression under the current working condition. The fault threshold is a freewheel current threshold in the motor controller loop.
S30, controlling a switching device in the motor controller to be turned on or turned off according to a preset rule, and detecting a test current of the switching device in an action period;
the switching device is used for controlling the connection and disconnection of the U-phase, V-phase and W-phase bridge arms of the inverter in the motor controller. The switching devices may be various types of switching transistors, such as switching transistors, metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), or insulated gate bipolar transistors, i.e., IGBT (Insulated Gate Bipolar Transistor), etc. In this embodiment, an IGBT is selected as the switching device. The test current is the follow current flowing through the switching device in the controller loop.
And S40, judging whether the motor is in single-phase short circuit to ground or not according to the fault threshold value and the magnitude of the test current.
Judging whether the motor is in single-phase short circuit to ground according to the fault threshold value and the magnitude of the test current, and if the test current is larger than the fault threshold value, generating the single-phase short circuit to ground by the motor.
The motor controller is suitable for detecting whether the motor is in single-phase short circuit to ground or not in the application occasion that the motor controller provides alternating current energy for the motor, and can be used in the fields of electric automobiles, electric motorcycles, electric steamers and the like. In this embodiment, the method is applied to detecting whether a motor of an electric automobile is shorted to the ground in a single phase.
According to the method, the fault threshold value is obtained through calculation of the characteristic parameters of the motor and the motor controller, the test current flowing through the switching device in the motor controller, such as the follow current flowing through the switching device, is detected, and whether the motor of the electric automobile is in single-phase short circuit to ground is judged according to the fault threshold value and the test current. Compared with the traditional unbalanced method of three-phase current, the method has the advantages that due to the limitation of current sampling bandwidth, high-frequency current cannot be acquired under the conditions of low carrier frequency and low bus voltage, the acquired three-phase current is zero, and the phenomenon of single-phase ground short circuit false alarm or missing alarm occurs, so that the occurrence of single-phase ground short circuit cannot be accurately measured. The detection of the low-frequency follow current, such as the detection of the test current flowing through the switching device in the motor controller, is easier to collect and detect than the high-frequency current, is not easy to make mistakes, and improves the detection effect of the single-phase ground short circuit of the electric automobile motor. In addition, the cost of detecting the single-phase to ground short circuit of the electric automobile motor can be reduced without adding an additional hardware circuit.
Specifically, referring to fig. 2, fig. 2 shows a schematic circuit diagram of an inverter of a typical motor controller. In a typical carrier cycle of the inverter, in the first mode, the first switching tube S1 is turned on, and the duration is maintained for half of the carrier cycle; then, entering a second mode, wherein in the second mode, the first switching tube S1 to the sixth switching tube are not conducted, and the state is maintained for a first dead time; then entering a third mode, wherein in the third mode, a fourth switching tube S4 and a sixth switching tube S6 are simultaneously conducted and the duration of the fourth switching tube S4 and the sixth switching tube S6 is maintained for half a carrier period; then, a fourth mode is entered, in which none of the first to sixth switching transistors S1 to S is turned on, and this state is maintained for a second dead time. And then back to the first modality, i.e. to enter the next carrier cycle. Wherein the first dead time and the second dead time are equal. By integrating each mode, the total energy expression in one carrier period, namely R (Ts-Tsq) Io, can be obtained 2 An expression of + (2udtsq+2udr1c-2udrc+2us ts-2us tsq) Io-CUd (4us+ud) =0.
Please refer to the above expression, wherein Io is the winding freewheeling current, ud is the bus voltage of the direct current, us is the conduction voltage drop of the single switching tube (i.e. the conduction voltage drop of any one of the first switching tube S1 to the sixth switching tube S6), tsq is the dead time, and C is the one-sided safety capacitor (i.e. Y in the figure 1 R1 is the short-circuit branch resistance (the resistance from the short-circuit point to ground), R is the winding loop resistance, ts is the carrier period. Solving the equation to obtain the followingSolution equation of (2)
From the equation, factors affecting the winding freewheel current Io are also derived. Since the winding freewheel current Io is equal to the fault threshold, the value of the fault threshold can be obtained by only obtaining the values of the factors influencing the winding freewheel current Io and substituting the values into a solution equation.
In addition, because the actual value of the short-circuit branch resistor is smaller, and an accurate value is not easy to obtain, the calibration is generally carried out only on the basis of theory, so that the value has small influence on the follow current Io of the winding and can be ignored.
Specifically, in this embodiment, the obtaining the characteristic parameters of the motor and the motor controller under the current working conditions (i.e. step S1) includes:
s11, acquiring a phase resistance value (namely the winding loop resistance R) of the motor;
specifically, referring to fig. 2, in this embodiment, the obtaining the phase resistance of the motor includes:
the upper bridge switch of any phase, such as a U-phase upper bridge switch device (i.e. a first switch tube S1 in the figure), and the lower bridge switch devices of other phases, such as a W-phase lower bridge switch device (i.e. a sixth switch tube S6 in the figure), are conducted, the duty ratio is continuously adjusted, when the current in the loop is detected to reach a set threshold value, the output voltage is calculated through the bus voltage and the duty ratio, and the phase resistance value of the motor is obtained according to the ratio of the output voltage and the current according to ohm law.
In other embodiments, the switching device of the upper bridge of the U-phase (i.e. the first switching tube S1 in the figure) and the switching device of the lower bridge of the V-phase (i.e. the fourth switching tube S4 in the figure) can be turned on, the duty ratio is increased continuously, when the current in the loop is detected to reach the set threshold value, the output voltage is calculated through the bus voltage and the duty ratio, and the phase resistance value of the motor is obtained from the ratio of the output voltage and the current according to ohm' S law.
S12, reading bus voltage, dead time and carrier frequency; and
in this embodiment, the bus voltage, the dead time, and the carrier frequency are read by a sampling circuit or sensor in the motor controller. No additional hardware detection circuit is needed. The purpose of reducing the cost is achieved. The bus voltage corresponds to the bus voltage Ud of the direct current in the expression. The dead time corresponds to the dead time Tsq in the expression.
In this case, dead time means that in order to avoid a bridge-arm connection of the switching tube being connected, it is often recommended to add a so-called "interlock delay time" to the control strategy, or "dead time". This means that one of the switching tubes is first switched off and then the other switching tube is switched on again at the end of the dead time, so that the through-phenomenon caused by an asymmetry of the on-time and the off-time can be avoided.
The carrier frequency refers to the switching frequency of the switching tube (i.e., any one of the first switching tube S1 to the sixth switching tube S6). The carrier period T can be obtained by calculating the reciprocal of the carrier frequency S 。
S13, reading the safety capacitor in the motor controller (namely the Shan Cean capacitor Y 1 ) And the conduction voltage drop of the switching device (i.e. the conduction voltage drop U of the single switching tube S )。
Therefore, the fault threshold value Io under the working condition can be obtained by substituting the obtained motor controller resistance, bus voltage, dead time, carrier frequency, safety capacitor and conduction voltage drop of the switching device into a solution equation.
The freewheel circuit flowing through the switching device is next detected. In this embodiment, the switching device in the motor controller is turned on or off according to a preset rule, and the detecting the test current during the action of the switching device includes:
maintaining a constant duty cycle, switching on any one phase upper bridge switching device, such as a U-phase upper bridge switching device (i.e., the first switching transistor S1 in fig. 2), during the first half of one carrier period, switching on other phase lower bridge switching devices, such as a V-phase lower bridge switching device (i.e., the fourth switching transistor S4 in fig. 2) and a W-phase lower bridge switching device (i.e., the sixth switching transistor S6 in fig. 2), during the second half of one carrier period, and detecting the magnitude of the test current in the loop.
When the short circuit to ground does not occur, S1, S4 and S6 are complementarily conducted in one carrier period, namely S1 is conducted for half a carrier period, S4 and S6 are conducted for half a carrier period at the same time, no loop is formed in the circuit, and no current exists naturally. When the motor is in a single-phase to ground short circuit, S1, S4 and S6 are complementarily conducted in one carrier period, and a follow current exists in the loop due to the existence of a short circuit point.
In this embodiment, determining whether the motor is shorted to ground in a single phase according to the fault threshold and the test current includes:
and if the test current is larger than the fault threshold value and the accumulated value of the test current larger than the fault threshold value reaches a set threshold value, judging that the electric automobile motor is in single-phase ground short circuit.
Further, the set threshold is a duration threshold or a detection number threshold. And when the duration that the test current is detected to be larger than the fault threshold reaches a time threshold, judging that the motor relatively has short-circuit fault. For example, the duration threshold is set to be 1S, and when the duration that the test current is detected to be greater than the fault threshold and is more than 1S, the electric automobile motor is judged to have a single-phase short circuit to ground. The purpose of setting the duration threshold is therefore to ensure that the freewheel current is actually present, avoiding that an occasional detection error thus leads to a misunderstanding that freewheel current is present, resulting in a misjudgment that the motor is in a single-phase to ground short. The accuracy of detecting the test current is improved by setting the duration time threshold value, so that the detection effect of the single-phase to ground short circuit of the electric automobile motor is improved.
Alternatively, the test current through the loop is sensed multiple times. And when the duration time that the test current is detected to be larger than the fault threshold reaches a detection frequency threshold, judging that the motor relatively has short-circuit faults. For example, the threshold value of the detection times may be set to 3 times, and when the number of times that the test current is detected to be greater than the fault threshold value reaches 3 times or more, it is determined that a single-phase ground short circuit occurs in the electric automobile motor. The purpose of setting the detection frequency threshold value is to ensure that the follow current really exists, and avoid that the follow current is mistakenly considered to appear due to accidental detection errors, so that the motor is erroneously judged to have a single-phase to ground short circuit. The detection frequency threshold value is set to improve the accuracy of detecting the test current, so that the detection effect of the single-phase to ground short circuit of the electric automobile motor is improved.
Based on the same inventive concept, the embodiment of the invention also provides a system corresponding to the method in the first embodiment, see the second embodiment.
Example two
The application also provides a detection system of the single-phase ground short circuit of the motor, which is used for judging whether the single-phase ground short circuit of the motor of the electric automobile occurs or not, and comprises a processor (not shown), a memory (not shown) and a system control program which is stored in the memory and can run on the processor, wherein the step of the detection method of the single-phase ground short circuit of the motor is realized when the system control program is executed by the processor.
It should be appreciated that in some embodiments, the processor may be a Central Processing Unit (CPU), which may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, 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.
It should be appreciated that in some embodiments, the memory may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory, in some embodiments.
Since the second embodiment adopts all the technical solutions of the first embodiment, at least the beneficial effects brought by the technical solutions of the first embodiment are not described in detail herein. Since the system described in the second embodiment of the present invention is a system for implementing the method in the first embodiment of the present invention, based on the method described in the first embodiment of the present invention, a person skilled in the art can understand the specific structure and the modification of the system, and therefore, the description thereof is omitted herein. All systems used in the method according to the first embodiment of the present invention are within the scope of the present invention.
The application also provides a computer readable storage medium, wherein a system control program is stored on the computer readable storage medium, and the system control program realizes the steps of the motor single-phase to ground short circuit detection method when being executed by a processor.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The method for detecting the single-phase to ground short circuit of the motor is characterized by comprising the following steps of:
acquiring characteristic parameters of a motor and a motor controller;
calculating a fault threshold according to the characteristic parameters;
controlling a switching device in the motor controller to be conducted or closed according to a preset rule, and detecting the test current of the switching device in the action period;
judging whether the motor is in single-phase short circuit to ground or not according to the fault threshold value and the magnitude of the test current;
the obtaining of the characteristic parameters of the motor and the motor controller comprises the following steps:
acquiring the phase resistance value of the motor;
reading bus voltage, dead time and carrier frequency; and
and reading the conduction voltage drop of the safety capacitor and the switching device in the motor controller.
2. The method for detecting a single-phase to ground short circuit of a motor according to claim 1, wherein the step of obtaining the phase resistance value of the motor comprises:
and switching on an upper bridge switching device of any phase and a lower bridge switching device of other phases, continuously adjusting the duty ratio, calculating output voltage through bus voltage and the duty ratio when detecting that the current in the loop reaches a set threshold, and obtaining the phase resistance value of the motor according to the ratio of the output voltage to the current.
3. The method of claim 1, wherein the bus voltage, the dead time, and the carrier frequency are read by a sampling circuit or a sensor in a motor controller.
4. The method of claim 1, wherein the fault threshold is a freewheel current threshold in the motor controller loop.
5. The method for detecting a single-phase to ground short circuit of a motor according to claim 1, wherein the switching device in the motor controller is turned on or off according to a preset rule, and detecting a test current during the operation of the switching device comprises:
and keeping a constant duty ratio, switching on any phase of upper bridge switching device in the first half carrier period, switching on other phases of lower bridge switching devices in the second half carrier period, and detecting the test current in the loop.
6. The method of claim 5, wherein determining whether the motor is shorted to ground in a single phase based on the fault threshold and the test current comprises:
and if the test current is larger than the fault threshold value and the accumulated value of the test current larger than the fault threshold value reaches a set threshold value, judging that the motor is in single-phase ground short circuit.
7. The method for detecting a single-phase to ground short circuit of a motor according to claim 6, wherein the set threshold is a duration threshold or a detection number threshold.
8. A system for detecting a single-phase to ground short of an electric motor, characterized in that it comprises a processor, a memory and a system control program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method for detecting a single-phase to ground short of an electric motor according to any one of claims 1 to 7.
9. A computer-readable storage medium, wherein a system control program is stored on the computer-readable storage medium, which when executed by a processor, implements the steps of the method for detecting a single-phase to ground short of a motor according to any one of claims 1 to 7.
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| CN202010727288.8A CN112083348B (en) | 2020-07-24 | 2020-07-24 | Method, system and storage medium for detecting single-phase to ground short circuit of motor |
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| CN202010727288.8A CN112083348B (en) | 2020-07-24 | 2020-07-24 | Method, system and storage medium for detecting single-phase to ground short circuit of motor |
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Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |