CN115333427A - Permanent magnet synchronous motor three-phase short circuit transient modeling method and device - Google Patents

Permanent magnet synchronous motor three-phase short circuit transient modeling method and device Download PDF

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CN115333427A
CN115333427A CN202210744330.6A CN202210744330A CN115333427A CN 115333427 A CN115333427 A CN 115333427A CN 202210744330 A CN202210744330 A CN 202210744330A CN 115333427 A CN115333427 A CN 115333427A
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axis current
current
short circuit
value
model
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许重斌
暴杰
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FAW Group Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/22—Current control, e.g. using a current control loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H02P21/20—Estimation of torque
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H02P21/28—Stator flux based control
    • H02P21/30—Direct torque control [DTC] or field acceleration method [FAM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation

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  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a three-phase short circuit transient modeling method and a device for a permanent magnet synchronous motor, wherein the method comprises the following steps: acquiring a parameter value of the motor body, an initial value when the synchronous motor is short-circuited and a constraint condition; determining a dq axis current value based on the motor body parameter, the initial value during short circuit and a constraint condition; and establishing a three-phase short circuit transient model based on the dq-axis current value. According to the method, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analytical model of the active short circuit is derived by determining initial conditions during short circuit, so that dq-axis current and torque at any moment are obtained, an accurate data base is provided for realizing the active short circuit, and meanwhile, the analytical model can help a controller to set reasonable compensation and realize accurate adjustment.

Description

Permanent magnet synchronous motor three-phase short circuit transient modeling method and device
Technical Field
The disclosure relates to the technical field of permanent magnet synchronous motor model construction, in particular to a permanent magnet synchronous motor three-phase short circuit transient modeling method and device.
Background
At present, the environment and energy are becoming increasingly concerned. In the field of automobiles, new energy automobiles with high efficiency, energy conservation and environmental protection become one of the inevitable development trends of the automobile industry. The permanent magnet synchronous motor driving system can achieve the purposes of low energy consumption and zero emission, and has great marketization prospect.
In the control of permanent magnet synchronous motors, especially permanent magnet synchronous motors for vehicles, unpredictable faults and severe working conditions are often encountered. When the fault level reaches a certain degree (overcurrent, overvoltage, stall and the like), a method is needed to quickly discharge the energy of the motor quickly, so that the effect of stopping the vehicle quickly is achieved.
At present, two ways of realizing active short circuit are generally available, one way is realized by hardware design, and a circuit of active short circuit is designed; and the other method is that the working state of the motor is monitored by a software design mode, whether the motor needs to enter a safe state is judged, when the motor needs to enter the safe state, the back electromotive force line voltages at two moments are calculated according to the rotor positions of the motor controller at the current moment and the next moment, an enabling signal of the motor controller is generated based on the motor entering the safe state and the motor threshold, the dq shaft current of the motor is controlled to be a characteristic current, and a control action signal is output, so that the driving signal can safely control the inverter to conduct a corresponding switch.
However, by detecting the current, the voltage and the motor speed and comparing the detected current, the voltage and the motor speed with a set threshold, the three-phase bridge inverter is controlled to enter a short-circuit mode after the threshold is reached, mathematical analysis and description are not performed on a transient process of an active short circuit, the dq-axis current and the torque at any time cannot be obtained, and the current and the torque of the motor are easily out of control.
Disclosure of Invention
In view of this, an object of the present disclosure is to provide a method and an apparatus for modeling a three-phase short transient state of a permanent magnet synchronous motor, so as to solve the technical problem that current and torque are easily out of control because dq-axis current and torque at any time cannot be predicted in the prior art.
In order to achieve the above object, in a first aspect, the present disclosure provides a method for modeling a three-phase short circuit transient of a permanent magnet synchronous motor, including: acquiring a parameter value of the motor body, an initial value when the motor is short-circuited and a constraint condition; determining a dq-axis current value of the permanent magnet synchronous motor based on the parameter value, the initial value and a constraint condition; and establishing a three-phase short circuit transient model based on the dq-axis current value to obtain the dq-axis current and the torque.
In some embodiments, the machine body parameters include resistance, direct axis inductance, quadrature axis inductance, permanent magnet flux linkage, pole pair number.
In some embodiments, the initial values include a starting torque, a starting speed, a starting current magnitude, a starting current dq axis component.
In some embodiments, the determining a dq axis current value based on the motor body parameter and the initial value at the time of the short circuit comprises: determining an electromagnetic torque based on the motor body parameter; determining the dq-axis current value based on the electromagnetic torque and a current initial value.
In some embodiments, said building a three-phase short-circuit transient model based on said dq-axis current values comprises: obtaining a dq axis current sub-model based on the dq axis current value; a braking torque sub-model is determined based on the dq-axis current model.
In some embodiments, the dq-axis current submodel includes: the first current submodel is a change value of the dq axis current along with time when the initial value of the current is 0; and a second current submodel, wherein the second current submodel is a change value of the dq axis current along with time when the initial value of the current is not 0.
In some embodiments, the obtaining a dq axis current sub-model based on the dq axis current value comprises: when the initial value of the current is 0, determining a first current sub-model based on the dq-axis current value; when the current initial value is not 0, a second current sub-model is determined based on the dq-axis current value.
In a second aspect, the present disclosure further provides a permanent magnet synchronous motor three-phase short circuit transient modeling apparatus, including:
the acquisition module is used for acquiring the parameter value of the motor body, the initial value when the motor is in short circuit and the constraint condition; the determining module is used for determining a dq axis current value based on the motor body parameter, the initial value in the short circuit and a constraint condition; and the model establishing module is used for establishing a three-phase short circuit transient model based on the dq axis current value.
In a third aspect, the present disclosure further provides a storage medium storing a computer program, where the computer program is executed by a processor to implement the steps of the method in any one of the above technical solutions.
In a fourth aspect, the present disclosure further provides an electronic device, at least including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method in any one of the above technical solutions when executing the computer program on the memory.
According to the embodiment of the disclosure, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analytical model of active short circuit is deduced by determining initial conditions during short circuit, so that dq-axis current and torque at any moment are obtained, an accurate data base is provided for realizing active short circuit, and meanwhile, the analytical model can help a controller to set reasonable compensation, so that accurate adjustment is realized.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic step diagram of a three-phase short transient modeling method for a permanent magnet synchronous motor provided by the present disclosure;
FIG. 2 is a schematic diagram of the steps for obtaining the dq axis current values in the modeling method provided by the present disclosure;
FIG. 3 is a schematic diagram of the steps for determining a three-phase short transient model in the modeling method provided by the present disclosure;
fig. 4 is a structural block diagram of a three-phase short-circuit transient modeling device of a permanent magnet synchronous motor provided by the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device provided by the present disclosure.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, but the present disclosure is not limited thereto.
It will be understood that various modifications may be made to the embodiments disclosed herein. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment, given as a non-limiting example, with reference to the attached drawings.
It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The description may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.
The present disclosure is further described with reference to the following figures and specific embodiments.
Example 1
The first embodiment of the disclosure relates to the field of permanent magnet synchronous motors, in particular to a three-phase short circuit transient modeling method for a permanent magnet synchronous motor. The permanent magnet synchronous motor comprises an axial flux permanent magnet synchronous motor, the flux direction of the AFPMSM is axial, the AFPMSM has the advantages of simple structure, small size, flexibility in control, high efficiency and the like, a rotor magnetic field directional vector control method is usually adopted for the motor, and the motor is suitable for pure electric vehicles.
As shown in fig. 1, the method for modeling the three-phase short circuit transient of the permanent magnet synchronous motor includes the following steps:
and S101, acquiring a parameter value of the motor body, an initial value when the motor is short-circuited and a constraint condition.
In the step, the parameter value of the motor body, the initial value when the motor is short-circuited and the constraint condition are obtained; the motor comprises a motor body, wherein the parameter values of the motor body comprise a resistor, a direct-axis inductor, a quadrature-axis inductor, a permanent magnetic flux linkage and a pole pair number, and the initial values comprise initial torque, initial rotating speed, initial current amplitude and initial current dq axis components.
The following voltages of the permanent magnet synchronous motor can be obtained by utilizing classical transformation and based on a constant amplitude transformation principle.
Figure BDA0003716648620000051
When three phases of the permanent magnet synchronous motor occur, the constraint conditions are met:
Figure BDA0003716648620000052
wherein R is stator phase resistance, p n Is the number of pole pairs, u d 、u q Is the dq-axis voltage component of the permanent magnet machine, L d 、L q Is a dq-axis inductance, i, of a permanent magnet machine d 、i q Is the dq-axis stator armature current component of the permanent magnet motor, omega is the mechanical angular velocity, psi f Is a permanent magnet flux linkage, and Te is an electromagnetic torque.
And S102, obtaining a dq axis current value based on the motor body parameter, the initial value during short circuit and the constraint condition.
After the above step S101 is completed, in this step, a dq-axis current value is obtained based on the motor body parameter value, the initial value at the time of the short circuit, and the constraint condition. As shown in fig. 2, the specific steps of obtaining the dq axis current value are as follows:
s201, determining electromagnetic torque based on the motor body parameters.
In this step, the electromagnetic torque is determined based on the motor body parameter. According to the torque equation of the permanent magnet synchronous motor, the following conditions are obtained:
Figure BDA0003716648620000061
based on formula (1) and formula (2):
Figure BDA0003716648620000062
s202, determining the dq axis current value based on the electromagnetic torque and the current initial value.
After the above step S201 is completed, in this step, the dq-axis current value is determined based on the electromagnetic torque and the current initial value.
When the initial value of the current is zero, laplace transform is performed on the formula (4), and the following formula (5) is obtained:
Figure BDA0003716648620000063
converting said formula (5) into a matrix form, resulting in formula (6):
Figure BDA0003716648620000064
and (3) calculating and solving the formula (6) by using a second-order inverse matrix to obtain a dq-axis current value when the initial value of the current is zero:
Figure BDA0003716648620000065
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003716648620000066
Figure BDA0003716648620000067
when the initial value of the current is not zero, performing laplace change on the formula (4) to obtain a formula (9):
Figure BDA0003716648620000068
converting said formula (9) into a matrix form, resulting in formula (10):
Figure BDA0003716648620000071
and (3) calculating and solving the formula (10) by using a second-order inverse matrix to obtain a dq-axis current value when the current initial value is not zero:
Figure BDA0003716648620000072
and S103, establishing a three-phase short circuit transient model based on the dq-axis current value.
After determining the dq-axis current values, in this step, a three-phase short transient model is determined based on the dq-axis current values. As shown in fig. 3, the method specifically includes the following steps:
and S301, obtaining a dq-axis current submodel based on the dq-axis current value.
First, a dq axis current sub-model is obtained based on the dq axis current value, wherein the dq axis current sub-model includes a first current sub-model and a second current sub-model.
Specifically, the first current submodel is a time-varying value of dq-axis current when an initial value of current is zero; and the second current submodel is a change value of the dq axis current along with time when the initial value of the current is not zero.
When the initial value of the current is zero, the root number in equation (8) is negative at high speed, and therefore a complex conjugate root is generated. The real part and the imaginary part of the conjugate complex root are assumed to be
Figure BDA0003716648620000073
Figure BDA0003716648620000074
And
Figure BDA0003716648620000075
then there are:
(s-s 1 )(s-s 2 )＝[s-(σ+jv)]·[s-(σ-jυ)]＝(s-σ) 2 +v 2 formula (12)
Accordingly, equation (7) is developed in partial form as follows:
Figure BDA0003716648620000076
from equations (7) and (13), the following equations can be derived:
Figure BDA0003716648620000081
solving the equation to obtain an analytic value of the coefficient A, B, C, X, Y, Z:
Figure BDA0003716648620000082
using the common laplace transform relation (15):
Figure BDA0003716648620000083
performing inverse laplace transform on the formula (13) and the formula (14) to obtain a first current sub-model, that is, after a three-phase short circuit occurs and the initial value of the current is zero, the expression of the dq-axis current is as follows:
Figure BDA0003716648620000084
when the initial value of the current is not zero, the following part of equation (11) is developed:
Figure BDA0003716648620000085
the analytical value of the coefficient A, B, C, X, Y, Z obtained from formula (11) and formula (17) is:
Figure BDA0003716648620000091
and performing inverse Laplace transform by using a Laplace transform formula (15) to obtain a second current sub-model, namely obtaining an expression of dq axis current when the initial value of the current is not zero after the three-phase short circuit occurs, wherein the expression is as follows:
Figure BDA0003716648620000092
s302, determining a braking torque sub-model based on the dq-axis current sub-model.
After the dq-axis current submodel is obtained, a braking torque submodel is determined based on the dq-axis current submodel. Using equations (16) and (19), the braking torque at any time during the short circuit can be calculated using equation (3):
Figure BDA0003716648620000093
the formula (16), the formula (19) and the formula (20) jointly form a three-phase short-circuit transient model of the permanent magnet synchronous motor.
Figure BDA0003716648620000101
By establishing a three-phase short circuit transient model of the permanent magnet synchronous motor, it can be seen that in the three-phase short circuit process of the permanent magnet synchronous motor, the three-phase short circuit is a symmetrical short circuit, the response characteristic of the shaft current is independent of the position of a rotor, and the response characteristic depends on the parameters (resistance, inductance, flux linkage and pole pair number) of the motor body and the running state (rotating speed, torque/current) at the occurrence moment of the short circuit. However, since the shaft current is obtained by coordinate transformation from three-phase currents, the electrical angular position of the motor is involved in the coordinate transformation, and therefore the current distribution on each phase winding is related to the rotor position at the time of short circuit. Meanwhile, the response of the shaft current can also be found to comprise a steady-state part and a transient part, wherein the steady-state part mainly depends on the parameters of the motor body and the rotating speed, and the transient part gradually converges
According to the permanent magnet synchronous motor three-phase short circuit transient modeling method provided by the embodiment of the disclosure, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analysis model of active short circuit is derived by determining initial conditions during short circuit, so that dq-axis current and torque at any time are obtained, an accurate data base is provided for realizing active short circuit, and meanwhile, the analysis model can help a controller to set reasonable compensation, so that accurate adjustment is realized.
Example 2
In order to better implement the above method, the second aspect of the present disclosure also provides a three-phase short-circuit transient modeling apparatus for a permanent magnet synchronous motor, and the control apparatus may be integrated on an electronic device.
For example, as shown in fig. 4, the modeling apparatus 200 may include: the obtaining module 210, the determining module 220 and the model establishing module 230 are specifically as follows:
(1) An obtaining module 210, configured to obtain a parameter value of the motor body, an initial value when the synchronous motor is short-circuited, and a constraint condition.
Specifically, the obtaining module 210 is configured to obtain a parameter value of the motor body, an initial value when the synchronous motor is short-circuited, and a constraint condition, where the parameter value of the motor body includes a resistance, a direct axis inductance, a quadrature axis inductance, a permanent magnet flux linkage, and a pole pair number, and the initial value includes an initial torque, an initial rotation speed, an initial current amplitude, and an initial current dq axis component.
(2) A determining module 220, configured to determine a dq axis current value based on the motor body parameter, the initial value at the time of the short circuit, and a constraint condition.
(3) And the model establishing module 230 is used for establishing a three-phase short-circuit transient model based on the dq-axis current value to obtain the dq-axis current and the torque.
Specifically, the model building module 230 may further include a current sub-model building unit and a torque sub-model building unit. Wherein the current submodel establishing unit obtains a dq-axis current submodel based on the dq-axis current value; the torque sub-model establishing unit determines a braking torque sub-model based on the dq-axis current model.
According to the permanent magnet synchronous motor three-phase short circuit transient modeling method provided by the embodiment of the disclosure, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analysis model of active short circuit is derived by determining initial conditions during short circuit, so that dq-axis current and torque at any time are obtained, an accurate data base is provided for realizing active short circuit, and meanwhile, the analysis model can help a controller to set reasonable compensation, so that accurate adjustment is realized.
Example 3
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.
To this end, a third embodiment of the present disclosure provides a storage medium, which is a computer-readable medium storing a computer program, which when executed by a processor, implements the method provided by the embodiments of the present disclosure, including the following steps S11 to S13:
s11, acquiring a parameter value of the motor body, an initial value when the synchronous motor is short-circuited and a constraint condition;
s12, determining a dq axis current value based on the motor body parameters, the initial value during short circuit and constraint conditions;
and S13, establishing a three-phase short circuit transient model based on the dq-axis current value.
Further, the computer program, when executed by a processor, implements the other methods provided by any of the above embodiments of the present disclosure.
According to the permanent magnet synchronous motor three-phase short circuit transient modeling method provided by the embodiment of the disclosure, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analysis model of active short circuit is derived by determining initial conditions during short circuit, so that dq-axis current and torque at any time are obtained, an accurate data base is provided for realizing active short circuit, and meanwhile, the analysis model can help a controller to set reasonable compensation, so that accurate adjustment is realized.
Example 4
A fourth embodiment of the present disclosure provides an electronic device, as shown in fig. 5, the electronic device includes at least a processor 401 and a memory 402, the memory 402 stores a computer program thereon, and the processor 401 implements the method provided by any embodiment of the present disclosure when executing the computer program on the memory 402. Illustratively, the method performed by the electronic device computer program is as follows:
s21, acquiring a parameter value of the motor body, an initial value when the synchronous motor is short-circuited and a constraint condition;
s22, determining a dq axis current value based on the motor body parameters, the initial value during short circuit and constraint conditions;
and S23, establishing a three-phase short circuit transient model based on the dq-axis current value.
In a specific implementation, the obtaining module 210, the determining module 220, and the model building module 230 are all stored in the memory 402 as program units, and the processor 401 executes the program units stored in the memory 402 to implement corresponding functions.
According to the permanent magnet synchronous motor three-phase short circuit transient modeling method provided by the embodiment of the disclosure, a motor equation and an electromagnetic torque equation are established according to motor body parameters, and a transient analysis model of active short circuit is derived by determining initial conditions during short circuit, so that dq-axis current and torque at any time are obtained, an accurate data base is provided for realizing active short circuit, and meanwhile, the analysis model can help a controller to set reasonable compensation, so that accurate adjustment is realized.
The storage medium may be included in the electronic device; or may exist separately without being assembled into the electronic device.
The storage medium carries one or more programs that, when executed by the electronic device, cause the electronic device to: acquiring at least two internet protocol addresses; sending a node evaluation request comprising at least two internet protocol addresses to node evaluation equipment, wherein the node evaluation equipment selects the internet protocol addresses from the at least two internet protocol addresses and returns the internet protocol addresses; receiving an internet protocol address returned by the node evaluation equipment; wherein the obtained internet protocol address indicates an edge node in the content distribution network.
Alternatively, the storage medium carries one or more programs that, when executed by the electronic device, cause the electronic device to: receiving a node evaluation request comprising at least two internet protocol addresses; selecting an internet protocol address from at least two internet protocol addresses; returning the selected internet protocol address; wherein the received internet protocol address indicates an edge node in the content distribution network.
Computer program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including but not limited to an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the passenger computer, partly on the passenger computer, as a stand-alone software package, partly on the passenger computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the passenger computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It should be noted that the storage media described above in this disclosure can be computer readable signal media or computer readable storage media or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any storage medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a storage medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Wherein the name of an element does not in some cases constitute a limitation on the element itself.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems on a chip (SOCs), complex Programmable Logic Devices (CPLDs), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
While the present disclosure has been described in detail with reference to the embodiments, the present disclosure is not limited to the specific embodiments, and those skilled in the art can make various modifications and alterations based on the concept of the present disclosure, and the modifications and alterations should fall within the scope of the present disclosure as claimed.

Claims (10)

1. A three-phase short circuit transient modeling method for a permanent magnet synchronous motor is characterized by comprising the following steps:
acquiring a parameter value of the motor body, an initial value when the motor is in short circuit and a constraint condition;
determining a dq axis current value of the permanent magnet synchronous motor based on the parameter value, the initial value and a constraint condition;
and establishing a three-phase short circuit transient model of the permanent magnet synchronous motor based on the dq-axis current value to obtain the dq-axis current and the torque.
2. The method of claim 1, wherein the motor bulk parameter values include resistance, direct-axis inductance, quadrature-axis inductance, permanent magnet flux linkage, and pole pair number.
3. The method of claim 1, wherein the initial values comprise a starting torque, a starting speed, a starting current amplitude, and a starting current dq axis component.
4. The method of claim 1, wherein the determining the dq-axis current value based on the motor body parameter and an initial value at the time of the short circuit comprises:
determining an electromagnetic torque based on the motor body parameter;
determining the dq-axis current value based on the electromagnetic torque and a current initial value.
5. The method of claim 1, wherein the building a three-phase short transient model based on the dq-axis current values comprises:
obtaining a dq axis current sub-model based on the dq axis current value;
a braking torque sub-model is determined based on the dq-axis current model.
6. The method of claim 5, wherein the dq-axis current sub-model comprises:
a first current submodel, wherein the first current submodel is a change value of dq axis current along with time when a current initial value is 0;
and a second current submodel, wherein the second current submodel is a change value of the dq axis current along with time when the initial value of the current is not 0.
7. The method of claim 5, wherein the obtaining a dq-axis current sub-model based on the dq-axis current value comprises:
when the initial value of the current is 0, determining a first current sub-model based on the dq-axis current value;
when the current initial value is not 0, a second current sub-model is determined based on the dq-axis current value.
8. The utility model provides a PMSM three-phase short circuit transient state modeling device which characterized in that includes:
the acquisition module is used for acquiring the parameter value of the motor body, the initial value when the motor is in short circuit and the constraint condition;
a determining module, configured to determine a dq axis current value of the permanent magnet synchronous motor based on the parameter value, the initial value, and a constraint condition;
and the model establishing module is used for establishing a three-phase short circuit transient model based on the dq axis current value to obtain the dq axis current and the torque.
9. A storage medium storing a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 7 when executed by a processor.
10. An electronic device comprising at least a memory, a processor, the memory having a computer program stored thereon, characterized in that the processor realizes the steps of the method of any one of claims 1 to 7 when executing the computer program on the memory.
CN202210744330.6A 2022-06-27 2022-06-27 Permanent magnet synchronous motor three-phase short circuit transient modeling method and device Pending CN115333427A (en)

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