CN117148147B - Motor performance parameter determining method based on DC attenuation method of any rotor position - Google Patents

Motor performance parameter determining method based on DC attenuation method of any rotor position Download PDF

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Publication number
CN117148147B
CN117148147B CN202311397895.2A CN202311397895A CN117148147B CN 117148147 B CN117148147 B CN 117148147B CN 202311397895 A CN202311397895 A CN 202311397895A CN 117148147 B CN117148147 B CN 117148147B
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value
target motor
current
performance parameter
current value
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CN117148147A (en
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马一鸣
贺儒飞
彭煜民
李泽泉
王文辉
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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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
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation

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  • General Physics & Mathematics (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The application relates to a motor performance parameter determining method based on a DC attenuation method of any rotor position. The method comprises the following steps: acquiring a first armature current value, a three-phase voltage value and an exciting winding current value of a target motor under the condition that the target motor is in a first circuit state; acquiring a second armature current value of the target motor under the condition that the target motor is in a second circuit state; and inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determination model to obtain the performance parameter of the target motor. The method can be used for solving the circuit data by utilizing the performance parameter determination model based on the circuit data of the target motor in two circuit states and combining the circuit characteristics and the operation rule of the target motor, so that the accurate motor performance parameters are determined quickly, and the acquisition efficiency of the motor performance parameters is improved.

Description

Motor performance parameter determining method based on DC attenuation method of any rotor position
Technical Field
The present disclosure relates to the field of motor technologies, and in particular, to a method, an apparatus, a computer device, a storage medium, and a computer program product for determining a motor performance parameter based on a dc attenuation method of an arbitrary rotor position.
Background
The synchronous motor is an important component of an electric power system, and is a device integrating rotation, static, electromagnetic change and mechanical movement into a whole to realize electric energy and mechanical energy conversion. The performance parameters of the synchronous motor are decisive factors of the running characteristics of the motor, and accurately measuring the performance parameters of the synchronous motor plays an important role in performance evaluation and protection setting of the motor.
In the prior art, the method for measuring the performance parameters of the synchronous motor mainly comprises a three-phase abrupt short-circuit method and a static frequency domain response method.
However, when the traditional technology measures the performance parameters of the synchronous motor, the three-phase sudden short-circuit method belongs to destructive tests, is not suitable for being developed on a large-capacity synchronous motor, and can only acquire d-axis parameters; the static frequency domain response method needs to conduct rotor pre-positioning operation before experiments, is relatively difficult to implement for the large-capacity synchronous motor, needs to be provided with a frequency-adjustable power supply during the experiments, and is relatively high in equipment requirement.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a motor performance parameter determination method, apparatus, computer device, computer-readable storage medium, and computer program product based on an arbitrary rotor position dc attenuation method that can improve the acquisition efficiency of motor performance parameters.
In a first aspect, the present application provides a method for determining a motor performance parameter based on a dc attenuation method of an arbitrary rotor position, the method comprising:
acquiring a first armature current value, a three-phase voltage value and an excitation winding current value of a target motor under the condition that the target motor is in a first circuit state; the first circuit state represents that an excitation winding of the target motor is short-circuited, a negative end of a preset direct current constant voltage source is connected with any one phase of a three-phase winding of a stator of the target motor, a positive end of the preset direct current constant voltage source and a first breaker are connected in series and then are connected with another two-phase winding of the stator of the target motor, the other two-phase winding is in a parallel state, and a second breaker is connected in parallel between a joint of the first breaker and the other two-phase winding and the negative end of the preset direct current constant voltage source;
acquiring a second armature current value of the target motor under the condition that the target motor is in a second circuit state; the second circuit state represents the position of a rotor of the target motor, the three-phase winding of the target motor is short-circuited, the exciting winding short-circuited wire is disconnected, the positive end of the preset direct-current constant-voltage source and the third circuit breaker are connected in series and then connected with one end of the exciting winding, the negative end of the preset direct-current constant-voltage source is connected with the other end of the exciting winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the exciting winding and the negative end of the preset direct-current constant-voltage source;
And inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determination model to obtain the performance parameter of the target motor.
In one embodiment, the performance parameter generating model includes a rotor angle determining model, a shaft current determining model, and a parameter unsaturation value determining model, and the inputting the first armature current value, the second armature current value, the three-phase voltage value, and the exciting winding current value into the performance parameter determining model, to obtain the performance parameter of the target motor includes:
inputting the second armature current value to the rotor angle determination model to obtain a rotor position angle value of the target motor;
inputting the rotor position angle value and the first armature current value to the shaft current determination model to obtain a first shaft current value and a second shaft current value of the target motor;
determining a first shaft voltage value and a second shaft voltage value of the target motor in the first circuit state according to the three-phase voltage values;
inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into the parameter unsaturated value determination model to obtain a performance parameter unsaturated value of the target motor;
And taking the unsaturated value of the performance parameter as the performance parameter of the target motor.
In one embodiment, the parameter unsaturation value determining model includes an incremental current time domain general solution determining model and an incremental current frequency domain general solution determining model, and the inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into the parameter unsaturation value determining model to obtain the performance parameter unsaturation value of the target motor includes:
inputting the exciting winding current value, the first shaft current value and the second shaft current value into the incremental current time domain open solution determining model to obtain incremental current time domain open solution information of the target motor;
inputting the first shaft voltage value and the second shaft voltage value into the incremental current frequency domain general solution determining model to obtain incremental current frequency domain general solution information of the target motor;
and comparing the incremental current time domain open solution information with the incremental current frequency domain open solution information to obtain the performance parameter unsaturated value of the target motor.
In one embodiment, the comparing the delta current time domain open solution information with the delta current frequency domain open solution information to obtain the performance parameter unsaturated value of the target motor includes:
Fitting the incremental current time domain open solution information with the exciting winding current value to obtain a time domain fitting result of the target motor;
converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result;
and comparing the frequency domain conversion result with the incremental current frequency domain general solution information to determine the performance parameter unsaturated value of the target motor.
In one embodiment, after the determining the performance parameter unsaturation value of the target motor, the method further includes:
acquiring a first axis saturation coefficient and a second axis saturation coefficient of the target motor;
inputting the performance parameter unsaturated value, the first axis saturation coefficient and the second axis saturation coefficient into a reaction reactance saturation value determining model to obtain a reaction reactance saturation value of the target motor;
and taking the saturation value of the reaction reactance as a performance parameter of the target motor.
In one embodiment, the obtaining the first axis saturation coefficient and the second axis saturation coefficient of the target motor includes:
acquiring no-load voltage saturation curve information of an exciting current machine end of the target motor;
acquiring a rated excitation current value of the target motor, and determining a no-load voltage value corresponding to the rated excitation current value according to the rated excitation current value and no-load voltage saturation curve information of the excitation current machine end;
And acquiring air gap line information of the target motor, and determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and the no-load voltage value.
In one embodiment, the inputting the performance parameter unsaturated value, the first axis saturation coefficient and the second axis saturation coefficient into a reactive reactance saturation value determining model to obtain a reactive reactance saturation value of the target motor includes:
acquiring a first product between the performance parameter unsaturated value and the first axis saturation coefficient;
obtaining a second product between the performance parameter unsaturated value and the second axis saturation coefficient;
and determining the reaction reactance saturation value according to the first product and the second product.
In a second aspect, the present application further provides a device for determining a motor performance parameter based on a dc attenuation method of an arbitrary rotor position, the device comprising:
the first parameter acquisition module is used for acquiring a first armature current value, a three-phase voltage value and an excitation winding current value of a target motor under the condition that the target motor is in a first circuit state; the first circuit state represents that an excitation winding of the target motor is short-circuited, a negative end of a preset direct current constant voltage source is connected with any one phase of a three-phase winding of a stator of the target motor, a positive end of the preset direct current constant voltage source and a first breaker are connected in series and then are connected with another two-phase winding of the stator of the target motor, the other two-phase winding is in a parallel state, and a second breaker is connected in parallel between a joint of the first breaker and the other two-phase winding and the negative end of the preset direct current constant voltage source;
A second parameter obtaining module, configured to obtain a second armature current value of the target motor when the target motor is in a second circuit state; the second circuit state represents the position of a rotor of the target motor, the three-phase winding of the target motor is short-circuited, the exciting winding short-circuited wire is disconnected, the positive end of the preset direct-current constant-voltage source and the third circuit breaker are connected in series and then connected with one end of the exciting winding, the negative end of the preset direct-current constant-voltage source is connected with the other end of the exciting winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the exciting winding and the negative end of the preset direct-current constant-voltage source;
and the performance parameter determining module is used for inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determining model to obtain the performance parameter of the target motor.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, the memory storing a computer program which, when executed by the processor, implements the steps of the method described above.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method described above.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprising a computer program which, when executed by a processor, implements the steps of the method described above.
According to the motor performance parameter determining method, the motor performance parameter determining device, the computer equipment, the storage medium and the computer program product based on the random rotor position direct current attenuation method, under the condition that the target motor is in a first circuit state, a first armature current value, a three-phase voltage value and an exciting winding current value of the target motor are obtained, so that the target motor is set to be in short circuit with the exciting winding, the negative end of a preset direct current constant voltage source is connected with any one phase of three-phase windings of a stator of the target motor, the positive end of the preset direct current constant voltage source and a first circuit breaker are connected in series and then are connected with the other two-phase windings of the stator of the target motor, the other two-phase windings are in a parallel state, the first circuit state of a second circuit breaker is connected between the connecting position of the first circuit breaker and the other two-phase windings and the negative end of the preset direct current constant voltage source in parallel, the circuit parameter of the target motor in the first circuit state is determined, and data support is provided for subsequent performance parameter calculation; under the condition that the target motor is in a second circuit state, obtaining a second armature current value of the target motor, setting the target motor as the second circuit state to be at a position for fixing a rotor of the target motor, shorting a three-phase winding of the target motor, unbinding an excitation winding shorting wire, connecting a positive end of a preset direct current constant voltage source and a third circuit breaker in series and then connecting one end of the excitation winding, connecting a negative end of the preset direct current constant voltage source with the other end of the excitation winding, connecting a second circuit state of a fourth circuit breaker in parallel between a connecting part of the first circuit breaker and the excitation winding and the negative end of the preset direct current constant voltage source, determining circuit parameters of the target motor in the second circuit state, and providing data support for subsequent performance parameter calculation; the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value are input into a performance parameter determination model to obtain the performance parameter of the target motor, so that the performance parameter of the target motor is quickly obtained through the performance parameter determination model, the accurate motor performance parameter is determined by obtaining the circuit parameters of the target motor in two circuit states and utilizing the circuit parameters and the performance parameter determination model, the circuit data of the target motor in the two circuit states can be calculated by utilizing the performance parameter determination model based on the circuit data of the target motor in combination with the circuit characteristics and the operation rule of the target motor, and the accurate motor performance parameter is quickly determined, so that the obtaining efficiency of the motor performance parameter is improved.
Drawings
FIG. 1 is an application environment diagram of a method for determining motor performance parameters based on a DC decay method for arbitrary rotor positions in one embodiment;
FIG. 2 is a flow chart of a method for determining motor performance parameters based on a DC attenuation method for arbitrary rotor positions according to an embodiment;
FIG. 3 is a schematic diagram of a first circuit state according to one embodiment;
FIG. 4 is a schematic diagram of a second circuit state according to one embodiment;
FIG. 5 is a schematic diagram of an armature current in one embodiment;
FIG. 6 is a schematic diagram of another armature current in one embodiment;
FIG. 7 is a schematic view of a rotor position angle in one embodiment;
FIG. 8 is a block diagram of a motor performance parameter determination apparatus based on an arbitrary rotor position DC decay method in one embodiment;
fig. 9 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The motor performance parameter determining method based on the direct current attenuation method at any rotor position can be applied to an application environment shown in fig. 1. Wherein the motor 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server. In a case where the target motor is in the first circuit state, the server 104 acquires a first armature current value, a three-phase voltage value, and an exciting winding current value of the target motor; the first circuit state represents that an excitation winding of a target motor is short-circuited, the negative end of a preset direct current constant voltage source is connected with any one phase of three-phase windings of a stator of the target motor, the positive end of the preset direct current constant voltage source is connected with the other two-phase windings of the stator of the target motor after being connected in series with a first circuit breaker, the other two-phase windings are in a parallel state, and a second circuit breaker is connected in parallel between the connection part of the first circuit breaker and the other two-phase windings and the negative end of the preset direct current constant voltage source; in the case where the target motor is in the second circuit state, the server 104 acquires a second armature current value of the target motor; the second circuit state represents the position of a rotor of a fixed target motor, a three-phase winding of the target motor is short-circuited, an excitation winding short-circuited wire is disconnected, a positive end of a preset direct-current constant-voltage source and a third circuit breaker are connected in series and then connected with one end of the excitation winding, a negative end of the preset direct-current constant-voltage source is connected with the other end of the excitation winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the excitation winding and the negative end of the preset direct-current constant-voltage source; the server 104 inputs the first armature current value, the second armature current value, the three-phase voltage value, and the field winding current value to the performance parameter determination model, resulting in the performance parameter of the target motor. The server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
In some embodiments, as shown in fig. 2, a method for determining a motor performance parameter based on a dc attenuation method of an arbitrary rotor position is provided, and this embodiment is illustrated by applying the method to a server, it may be understood that the method may also be applied to a terminal, and may also be applied to a system including the terminal and the server, and implemented through interaction between the terminal and the server. In this embodiment, the method includes the steps of:
step S202, in a case where the target motor is in the first circuit state, acquiring a first armature current value, a three-phase voltage value, and an excitation winding current value of the target motor.
The target motor may refer to a motor that needs to acquire or calculate a performance parameter, and in practical application, the target motor may include a synchronous motor.
The first circuit state may be a test circuit for the target motor.
As an example, in the case where the target motor is in the first circuit state, as shown in fig. 3, there is provided a schematic diagram of the first circuit state in which the target motor is in the stationary state, the exciting winding is shorted, the negative end of the dc constant voltage source is connected to any one of the three-phase windings of the motor stator, the positive end of the dc constant voltage source and a circuit breaker K 1 And the two-phase windings are connected with the other two-phase windings of the stator after being connected in series, and the two-phase windings are in a parallel state. Simultaneously, another breaker K2 is connected in parallel between the connection part of the breaker K1 and the two-phase parallel windings of the stator and the negative end of the direct current constant voltage source, at the moment, the K1 is in a closing state, the K2 is in a separating state, the K2 is opened, and the K1 is closed at the same time, so that the armature end of the target motor generates attenuated direct current, and the server is used for controlling the motor three-phase voltage u in the dynamic process abc (three-phase voltage), armature current i abc (first armature current) and field winding current i f And recording waveforms of (exciting winding current) to obtain a first armature current value, a three-phase voltage value and an exciting winding current value of the target motor.
Step S204, acquiring a second armature current value of the target motor under the condition that the target motor is in a second circuit state; the second circuit state represents the position of a rotor of a fixed target motor, a three-phase winding of the target motor is short-circuited, an excitation winding short-circuited wire is disconnected, a positive end of a preset direct current constant voltage source and a third circuit breaker are connected in series and then connected with one end of the excitation winding, a negative end of the preset direct current constant voltage source is connected with the other end of the excitation winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the excitation winding and the negative end of the preset direct current constant voltage source.
Wherein the second circuit state may refer to another test circuit for the target motor.
As an example, in the case where the target motor is in the second circuit state, as shown in fig. 4, a schematic structural diagram of the second circuit state is provided in which the target motor rotor position is maintained unchanged, the armature three-phase windings are shorted, and the exciting windings are unbuckledAnd (5) wiring. The positive end of the direct current constant voltage source is connected with one end of the exciting winding after being connected in series with the breaker K1, and the negative end of the direct current constant voltage source is connected with the other end of the exciting winding. Simultaneously, another breaker K2 is connected in parallel between the connection part of the breaker K1 and the exciting winding and the negative end of the direct current constant voltage source, at the moment, the breaker K1 is in a closing state, the breaker K2 is in a separating state, at the moment, the breaker K2 is opened, and the breaker K1 is closed at the same time, so that the armature end of the target motor generates attenuated direct current, and the server generates armature current i in a dynamic process abc And (the second armature current) is recorded to obtain a second armature current value of the target motor.
Step S206, inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determination model to obtain the performance parameter of the target motor.
The performance parameter determination model may be a model constructed in advance for calculating the performance parameter of the target motor.
As an example, the server inputs the first armature current value, the second armature current value, the three-phase voltage value, and the exciting winding current value to the performance parameter determination model, which is preset according to the circuit characteristics and the operation rule of the target motor in the first circuit state and the second circuit state, and the performance parameter determination model can calculate the performance parameter of the target motor using the first armature current value, the second armature current value, the three-phase voltage value, and the exciting winding current value, thereby obtaining the performance parameter of the target motor.
According to the motor performance parameter determining method based on the random rotor position direct current attenuation method, under the condition that the target motor is in the first circuit state, the first armature current value, the three-phase voltage value and the exciting winding current value of the target motor are obtained, so that the target motor is set to be in short circuit with the exciting winding, the negative end of the preset direct current constant voltage source is connected with any one phase of the three-phase windings of the stator of the target motor, the positive end of the preset direct current constant voltage source is connected with the first circuit breaker in series and then is connected with the other two-phase windings of the stator of the target motor, the other two-phase windings are in the parallel connection state, the first circuit state of the second circuit breaker is connected between the connection position of the first circuit breaker and the other two-phase windings in parallel connection with the negative end of the preset direct current constant voltage source, the circuit parameter of the target motor in the first circuit state is determined, and data support is provided for subsequent performance parameter calculation; under the condition that the target motor is in a second circuit state, obtaining a second armature current value of the target motor, setting the target motor as the second circuit state to be at a position for fixing a rotor of the target motor, shorting a three-phase winding of the target motor, unbinding an excitation winding shorting wire, connecting a positive end of a preset direct current constant voltage source and a third circuit breaker in series and then connecting one end of the excitation winding, connecting a negative end of the preset direct current constant voltage source with the other end of the excitation winding, connecting a second circuit state of a fourth circuit breaker in parallel between a connecting part of the first circuit breaker and the excitation winding and the negative end of the preset direct current constant voltage source, determining circuit parameters of the target motor in the second circuit state, and providing data support for subsequent performance parameter calculation; the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value are input into a performance parameter determination model to obtain the performance parameter of the target motor, so that the performance parameter of the target motor is quickly obtained through the performance parameter determination model, the accurate motor performance parameter is determined by obtaining the circuit parameters of the target motor in two circuit states and utilizing the circuit parameters and the performance parameter determination model, the circuit data of the target motor in the two circuit states can be calculated by utilizing the performance parameter determination model based on the circuit data of the target motor in combination with the circuit characteristics and the operation rule of the target motor, and the accurate motor performance parameter is quickly determined, so that the obtaining efficiency of the motor performance parameter is improved.
In some embodiments, the performance parameter generation model includes a rotor angle determination model, a shaft current determination model, and a parameter unsaturation value determination model, and inputting the first armature current value, the second armature current value, the three-phase voltage value, and the field winding current value to the performance parameter determination model to obtain the performance parameter of the target motor includes: inputting the second armature current value into a rotor angle determination model to obtain a rotor position angle value of the target motor; inputting the rotor position angle value and the first armature current value into a shaft current determination model to obtain a first shaft current value and a second shaft current value of a target motor; determining a first shaft voltage value and a second shaft voltage value of the target motor in a first circuit state according to the three-phase voltage values; inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into a parameter unsaturated value determining model to obtain a performance parameter unsaturated value of the target motor; and taking the unsaturated value of the performance parameter as the performance parameter of the target motor.
The rotor angle determination model may refer to a model for calculating a rotor position angle of the target motor, among others.
The shaft current determination model may refer to a model for calculating d-axis current and q-axis current of the target motor, among others.
Wherein the parameter unsaturation value determination model may refer to a model for calculating a specific performance parameter of the target motor.
In practical application, since the rotor position of the target motor is maintained unchanged in the second circuit state, the rotor position angle value may also include the angle of the rotor of the target motor in the second circuit state.
The first axis current value may refer to a value of d-axis current of the target motor.
The second axis current value may refer to a value of q-axis current of the target motor.
The first axis voltage value may refer to a value of a d-axis voltage of the target motor.
Wherein the second axis voltage value may refer to a value of the q-axis voltage of the target motor.
The performance parameter unsaturated value may refer to unsaturated values of transient reactance and time constant of each order of d and q axes of the target motor.
As an example, the server inputs the second armature current value to the rotor angle determination model to obtain a rotor position angle value of the target motor, in particular, according to i in the dynamic process q The rotor angle determination model may represent the criterion of =0The method comprises the following steps:
。
wherein θ represents the angle between the axis of the d-axis of the rotor and the phase A, i a 、i b 、i c Representing the current of the three phases of the armature winding ABC, respectively, the second armature current value may comprise the current of the three phases of the armature winding ABC.
The server inputs the rotor position angle value and the first armature current value to a shaft current determination model, which can determine a first shaft current value and a second shaft current value of the target motor based on Park transformation; the server determines a first shaft voltage value and a second shaft voltage value of the target motor in a first circuit state according to the three-phase voltage value, specifically, the server uses an armature winding voltage u according to the connection mode of the stator winding of the target motor in the first circuit state a 、u b And u is equal to c Calculating d-axis voltage u applied equivalently in direct current attenuation test according to voltage Park transformation equation d With q-axis voltage u q And determining the frequency domain form u of the d, q axis voltages d (p) and u q (p), p is Laplacian, the short-circuited current can be disassembled into two parts by the superposition theorem, one part is a steady-state current component before test, and the other part is d-axis voltage u equivalently applied by a direct current attenuation test d With q-axis voltage u q The induced incremental current component is used for further determining d-axis and q-axis equivalent loop models and d-axis and q-axis operational reactance X of the motor d (p) and X q (p) when the number of rotor-side damper winding loops is N, for example, the reactance X is calculated d (p) can be expressed as:
。
wherein X is d Representing d-axis synchronous reactance; t (T) d ’, T d ’’, ... , T d (N+1) The d-axis short-circuit time constant of each order is represented, and the parameter containing the subscript 0 represents the open-circuit time constant.
When turning toWhen the number of sub-side damping winding loops is N, the reactance X is calculated q (p) can be expressed as:
。
wherein X is q Represents q-axis synchronous reactance; t (T) q ’, T q ’’, ... , T q (N+1) The q-axis short-circuit time constant of each order is represented, and the parameter containing the subscript 0 represents the open-circuit time constant.
The server inputs the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into a parameter unsaturated value determining model, and the parameter unsaturated value determining model can calculate the performance parameter unsaturated value of the target motor based on the circuit characteristics and the operation rules of the target motor in two circuit states; the server takes the unsaturated value of the performance parameter as the performance parameter of the target motor.
In the embodiment, a rotor position angle value of the target motor is obtained by inputting a second armature current value into a rotor angle determination model; inputting the rotor position angle value and the first armature current value into a shaft current determination model to obtain a first shaft current value and a second shaft current value of a target motor; determining a first shaft voltage value and a second shaft voltage value of the target motor in a first circuit state according to the three-phase voltage values; inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into a parameter unsaturated value determining model to obtain a performance parameter unsaturated value of the target motor; the performance parameter unsaturated value is used as the performance parameter of the target motor, and the accurate performance parameter unsaturated value of the target motor can be determined step by step based on the rotor angle determination model, the shaft current determination model and the parameter unsaturated value determination model, so that the acquisition efficiency of the performance parameter unsaturated value of the motor is improved.
In some embodiments, the parameter unsaturation value determining model includes an incremental current time domain general solution determining model and an incremental current frequency domain general solution determining model, and the exciting winding current value, the first axis current value, the second axis current value, the first axis voltage value and the second axis voltage value are input to the parameter unsaturation value determining model to obtain a performance parameter unsaturation value of the target motor, including: inputting the exciting winding current value, the first shaft current value and the second shaft current value into an incremental current time domain open solution determining model to obtain incremental current time domain open solution information of a target motor; inputting the first shaft voltage value and the second shaft voltage value into an incremental current frequency domain general solution determining model to obtain incremental current frequency domain general solution information of the target motor; and comparing the incremental current time domain interpretation information with the incremental current frequency domain interpretation information to obtain the performance parameter unsaturated value of the target motor.
The incremental current time domain general solution determining model may refer to a model for calculating a time domain general solution corresponding to the incremental current of the target motor.
The incremental current frequency domain general solution determining model may refer to a model for calculating a spectrum general solution corresponding to the incremental current of the target motor.
As an example, the server inputs the exciting winding current value, the first axis current value and the second axis current value into an incremental current time domain open solution determination model, which can calculate reactance X according to the d, q axis equivalent loop model and the d, q axis d (p) and X q (p) in combination with a first armature current value (d-axis delta current i) of the target motor in the first circuit state d And q-axis delta current i q ) And exciting winding current value (exciting winding increment current i) f ) Determining delta current time-domain flux information (i) of a target motor d 、i q And i f ) The method comprises the steps of carrying out a first treatment on the surface of the The server inputs the first axis voltage value and the second axis voltage value into an incremental current frequency domain general solution determining model, the incremental current frequency domain general solution determining model obtains a voltage balance equation in a frequency domain corresponding to the target motor, and the incremental current frequency domain general solution determining model calculates reactance X according to the first voltage value (d-axis voltage), the second voltage value (q-axis voltage) and the voltage balance equation in the frequency domain and d and q axes of the target motor d (p) and X q (p) determining reactance and time constant of each order of d and q axes of the motor and increment current passing solution i of frequency domain d (p)、i q (p) and i f (p) associationThe relation is taken as the increment current frequency domain general solution information of the target motor by the server, specifically, the transient reactance time constant of each order of d and q axes of the target motor and the frequency domain increment current general solution i d (p)、i q (p) and i f The relationship of (p) can be expressed as:
，
，
。
wherein r is s Represents the stator resistance, r f Representing the excitation winding resistance; t (T) D1s To T DNs The leakage time constants of the first damping loop to the Nth damping loop are respectively shown.
The server compares the incremental current time domain open solution information with the incremental current frequency domain open solution information, and determines the performance parameter unsaturated value of the target motor according to the difference between the incremental current time domain open solution information and the incremental current frequency domain open solution information.
In the embodiment, the incremental current time domain open solution information of the target motor is obtained by inputting the exciting winding current value, the first shaft current value and the second shaft current value into an incremental current time domain open solution determining model; inputting the first shaft voltage value and the second shaft voltage value into an incremental current frequency domain general solution determining model to obtain incremental current frequency domain general solution information of the target motor; the incremental current time domain general solution information and the incremental current frequency domain general solution information are compared to obtain a performance parameter unsaturated value of the target motor, the incremental current time domain general solution information and the incremental current frequency domain general solution information can be respectively determined based on the incremental current time domain general solution determination model and the incremental current frequency domain general solution determination model, a data basis is provided for subsequent data comparison determination of the performance parameter unsaturated value, and therefore the acquisition efficiency of the motor performance parameter is improved.
In some embodiments, comparing the delta current time domain general solution information with the delta current frequency domain general solution information to obtain a performance parameter unsaturated value of the target motor includes: fitting the incremental current time domain open solution information with the exciting winding current value to obtain a time domain fitting result of the target motor; converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result; and comparing the frequency domain conversion result with the incremental current frequency domain general solution information to determine the performance parameter unsaturated value of the target motor.
The time-domain fitting result may be data obtained by fitting the delta current time-domain open solution information with the exciting winding current value.
The frequency domain conversion result may refer to data obtained by converting the time domain fitting result into the frequency domain.
As one example, the server compares the delta current time domain commutation information with the field winding current value (i f Incremental current components) of the target motor to obtain a time domain fitting result of the target motor; after the server converts the time domain fitting result into the frequency domain, a preliminary conversion result is obtained, and the server performs a calculation on the preliminary fitting result (d and q axis increment current i in the frequency domain d (p)、i q (p) and field winding delta current i f The expression of (p) is arranged into a rational expression form, and the server takes the arranged preliminary fitting result with the rational expression form as a frequency domain conversion result; the server compares the frequency domain conversion result with the increment current frequency domain general solution information, for example, the server compares the d and q axis frequency domain increment current general solution in the increment current frequency domain general solution information with the d and q axis frequency domain increment current in the frequency domain conversion result, determines the performance parameter unsaturated value of the target motor (unsaturated value of transient reactance and time constant of each order of d and q axis), obtains the unsaturated value of transient reactance and time constant of each order of d and q axis, and then the server compares the exciting winding increment current general solution in the increment current frequency domain general solution information with the exciting winding increment current in the frequency domain conversion result, determines the d axis armature reaction reactance X ad Unsaturated value X of (2) adu And q-axis armature reaction reactance X aq Unsaturated value X of (2) adu 。
In the embodiment, fitting the incremental current time domain open solution information with the exciting winding current value to obtain a time domain fitting result of the target motor; converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result; and comparing the frequency domain conversion result with the incremental current frequency domain general solution information to determine the unsaturated value of the performance parameter of the target motor, and converting the incremental current general solution in a time domain form into a frequency domain form, so that data comparison is facilitated, and further, the acquisition efficiency of the performance parameter of the motor is improved.
In some embodiments, after determining the target motor performance parameter unsaturation value, the method further comprises: acquiring a first axis saturation coefficient and a second axis saturation coefficient of a target motor; inputting the unsaturated value of the performance parameter, the first axis saturation coefficient and the second axis saturation coefficient into a reaction reactance saturation value determining model to obtain a reaction reactance saturation value of the target motor; and taking the saturation value of the reaction reactance as the performance parameter of the target motor.
The first axis saturation coefficient may refer to a d-axis saturation coefficient of the target motor.
The second axis saturation coefficient may refer to a q-axis saturation coefficient of the target motor.
The reactive reactance saturation value determination model may refer to a model for calculating a saturation value of the reactive reactance of the target motor.
The reactive reactance saturation value may be a saturation value of the d-axis armature reactive reactance and the q-axis armature reactive reactance of the target motor.
As one example, a server obtains a first axis saturation coefficient and a second axis saturation coefficient of a target motor; the server inputs the performance parameter unsaturated value, the first axis saturated coefficient and the second axis saturated coefficient into a reaction reactance saturated value determining model, and the reaction reactance saturated value determining model is based on the operation rule of the target motor and calculates by utilizing the performance parameter unsaturated value, the first axis saturated coefficient and the second axis saturated coefficient to obtain a reaction reactance saturated value of the target motor; the server takes the saturation value of the reaction reactance as the performance parameter of the target motor.
In the embodiment, a first axis saturation coefficient and a second axis saturation coefficient of a target motor are obtained; inputting the unsaturated value of the performance parameter, the first axis saturation coefficient and the second axis saturation coefficient into a reaction reactance saturation value determining model to obtain a reaction reactance saturation value of the target motor; the reaction reactance saturation value is used as the performance parameter of the target motor, the accurate reaction reactance saturation value can be calculated based on the reaction reactance saturation value determining model, and the acquisition efficiency of the motor performance parameter is improved.
In some embodiments, obtaining the first and second axis saturation coefficients of the target motor includes: acquiring no-load voltage saturation curve information of an exciting current machine end of a target motor; acquiring a rated exciting current value of a target motor, and determining an idle voltage value corresponding to the rated exciting current value according to the rated exciting current value and the information of an idle voltage saturation curve of an exciting current machine end; and acquiring air gap line information of the target motor, and determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and the no-load voltage value.
The exciting current machine end no-load voltage saturation curve information may refer to exciting current-machine end no-load voltage (i) obtained by using a motor no-load characteristic test for a target motor f -u) saturation curve.
The rated excitation current value may refer to a value of the excitation current of the target motor in the rated working state.
The no-load voltage value may refer to an open-circuit voltage when the power output terminal of the target motor is not connected to the load.
The air gap line information may refer to an extension line of the linear portion of the no-load characteristic of the target motor.
As an example, the server determines the exciting current-machine side no-load voltage (i) of the target motor using test results corresponding to the motor no-load characteristic test for the target motor f -u) saturation curve, the server will excitation current-machine side no-load voltage (i f -u) the saturation curve is used as the information of the no-load voltage saturation curve of the exciting current machine end; the server obtains a rated exciting current value of the target motor, and no-load current of the exciting current machine end is obtained according to the rated exciting current valueThe voltage saturation curve information is used for determining a no-load voltage value corresponding to a rated exciting current value; the server obtains air gap line information of the target motor, and determines a first axis saturation coefficient (d-axis saturation coefficient k) of the target motor according to the corresponding value of the no-load voltage value on the air gap line sd ) And a second axis saturation coefficient (q-axis saturation coefficient k sq ) Specifically, d, q-axis saturation coefficient k sd And k is equal to sq Available rated exciting current i fN Lower no-load voltage u N Value and corresponding value u on the air gap line 0 Expressed as:
。
wherein X is ad Reaction reactance, X, of d-axis armature for target motor aq The reactance is reacted for the q-axis armature of the target motor.
In this embodiment, by acquiring the first axis saturation coefficient and the second axis saturation coefficient of the target motor, it includes: acquiring no-load voltage saturation curve information of an exciting current machine end of a target motor; acquiring a rated exciting current value of a target motor, and determining an idle voltage value corresponding to the rated exciting current value according to the rated exciting current value and the information of an idle voltage saturation curve of an exciting current machine end; the method comprises the steps of obtaining air gap line information of a target motor, determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and an idle voltage value, determining exciting current machine end idle voltage saturation curve information based on a pre-motor idle characteristic test, further determining an accurate saturation coefficient by utilizing the exciting current machine end idle voltage saturation curve information and the air gap line information and combining a rated exciting current value, and improving accuracy of the saturation coefficient.
In some embodiments, inputting the performance parameter unsaturation value, the first axis saturation coefficient, and the second axis saturation coefficient into a reactive reactance saturation value determination model to obtain a reactive reactance saturation value of the target motor, comprising: acquiring a first product between the performance parameter unsaturated value and the first axis saturation coefficient; obtaining a second product between the performance parameter unsaturated value and the second axis saturation coefficient; and determining a reactive saturation value according to the first product and the second product.
Wherein the first product may refer to a product of the performance parameter unsaturation value and the first axis saturation coefficient.
Wherein the second product may refer to the product of the performance parameter unsaturation value and the second axis saturation coefficient.
As an example, a server obtains a performance parameter unsaturation value (d-axis reactive reactance X ad Unsaturated value X of (2) adu ) And a first axis saturation coefficient (d-axis saturation coefficient k sd ) A first product (X adu *k sd ) The server takes the first product as a saturation value X of d-axis armature reaction reactance of the target motor under rated excitation current ads The method comprises the steps of carrying out a first treatment on the surface of the The server obtains the unsaturated value of the performance parameter (q-axis reaction reactance X aq Unsaturated value X of (2) aqu ) And a second axis saturation coefficient (q-axis saturation coefficient k sq ) A second product (X aqu *k sq ) The server takes the second product as a saturation value X of the q-axis armature reaction reactance of the target motor under the rated exciting current aqs 。
In this embodiment, by obtaining a first product between the performance parameter unsaturation value and the first axis saturation coefficient; obtaining a second product between the performance parameter unsaturated value and the second axis saturation coefficient; and determining a reaction reactance saturation value according to the first product and the second product, and determining an accurate reaction reactance saturation value based on the saturation coefficient and the performance parameter unsaturated value, thereby improving the acquisition efficiency of the motor performance parameter.
In some embodiments, after determining the reactive reactance saturation value, the method further comprises: comparing the frequency domain conversion result with the incremental current frequency domain general solution information to obtain a winding leakage reactance value and a resistance value of the target motor; according to the reactive reactance saturation value, the winding leakage reactance value and the resistance value, determining the reactance saturation value and the time constant saturation value of each order of the target motor; and taking the reactance saturation value and the time constant saturation value of each order as the performance parameters of the target motor.
The winding leakage reactance value may refer to a leakage reactance value of a winding corresponding to an equivalent circuit of the target motor.
The resistance value may refer to a resistance value of the target motor.
The saturation value of each order reactance may refer to a saturation value of each order reactance of the target motor.
The time constant saturation value may refer to a saturation value of a time constant of the target motor.
As an example, the server compares the frequency domain conversion result with the incremental current frequency domain general solution information to obtain a winding leakage reactance value and a resistance value of the target motor; the server inputs the reactive reactance saturation value, the winding leakage reactance value and the resistance value into a saturation value calculation model, specifically, the saturation value calculation model may include, but is not limited to, a ston model and a life model, the saturation value calculation model may determine model parameters by fitting experimental data or simulation results, and the saturation value calculation model calculates to obtain each order reactance saturation value and time constant saturation value of the target motor according to the model parameters and the reactive reactance saturation value, the winding leakage reactance value and the resistance value, and the server uses each order reactance saturation value and time constant saturation value as performance parameters of the target motor.
In the embodiment, the winding leakage reactance value and the resistance value of the target motor are obtained by comparing the frequency domain conversion result with the incremental current frequency domain general solution information; according to the reactive reactance saturation value, the winding leakage reactance value and the resistance value, determining the reactance saturation value and the time constant saturation value of each order of the target motor; by taking the reactance saturation value and the time constant saturation value of each order as the performance parameters of the target motor, the accurate reactance saturation value and the time constant saturation value of each order can be determined based on the response reactance saturation value, the winding leakage reactance value and the resistance value of the target motor, and the acquisition efficiency of the performance parameters of the motor is further improved.
In some embodiments, the performance parameters of the synchronous motor mainly include d-axis and q-axis each step stability, dynamic reactance and time constant, and in order to determine the performance parameters, the parameter determination may be performed by using a motor performance parameter determination method based on a dc attenuation method of any rotor position, and in particular, a motor performance parameter determination method based on a dc attenuation method of any rotor position may include the following steps:s301: in the case of the target motor being in the first circuit state, the motor three-phase voltage u to the target motor abc Armature current i abc And exciting winding current i f Recording the waveform of (2); s302: in the case of the target motor being in the second circuit state, the armature current i to the target motor abc Recording and calculating the rotor position angle theta at the moment; s303: three-phase current i obtained by S301 abc With the rotor position angle θ obtained in S302, d, q-axis currents i are calculated by Park conversion d And i q The method comprises the steps of carrying out a first treatment on the surface of the S304: according to the stator winding connection mode in S301, the armature winding voltage u a 、u b And u is equal to c Calculating d-axis voltage u applied equivalently in direct current attenuation test according to voltage Park transformation equation d With q-axis voltage u q And determining the frequency domain form u of the d, q axis voltages d (p) and u q (p), p being the Laplacian; s305: according to the superposition theorem, the short-circuited current can be disassembled into two parts, one part is a steady-state current component before test, and the other part is d-axis voltage u equivalently applied by a direct current attenuation test d With q-axis voltage u q The resulting incremental current component. Further, d-axis and q-axis equivalent loop models of the motor and d-axis and q-axis calculation reactance X are determined d (p) and X q (p) and determining therefrom the d-axis delta current i in the operation of step S301 d Delta current on q axis i q Delta current i with exciting winding f Time domain general solution i that should be present d (t)、i q (t) and i f (t); s306: with i determined in S305 d (t)、i q (t) and i f (t) for i obtained in S302 d 、i q I recorded in S301 f Fitting the increment current components of the frequency domain, and transforming the fitting result in the time domain to the frequency domain to obtain the increment current i of the d and q axes in the frequency domain d (p)、i q (p) and field winding delta current i f The expression of (p) and is organized into a form of a rational fraction; s307: u obtained by S304 d (p) and u q (p), voltage balance equation in frequency domain and d, q axis operation reactance X d (p) and X q (p) determining reactance, time constant and frequency domain of each order of d and q axes of motorIncremental current flow solution i d (p)、i q (p) and i f (p) relationship; s308: comparing the d and q axis frequency domain increment current passing solution obtained in S307 with i obtained by time-frequency conversion in S306 d (p) and i q (p) determining the unsaturated values of the transient reactance and the time constant of each order of the d and q axes of the motor; s309: after obtaining the unsaturated reactance and time constant value of each order in S308, comparing the exciting winding increment current obtained in S307 with i obtained by time-frequency conversion f (p) determining d-axis armature reaction reactance X ad Unsaturated value X of (2) adu Further determining leakage reactance value and resistance value of each winding of the d-axis equivalent circuit and q-axis armature reaction reactance X aq Unsaturated value X of (2) adu S310: excitation current-machine end no-load voltage (i) obtained by motor no-load characteristic test f -u) saturation curve and air gap line thereof, determining rated excitation current i fN Lower no-load voltage u N Value and corresponding value u on the air gap line 0 And obtain the saturation coefficients k of d and q axes sd And k is equal to sq The method comprises the steps of carrying out a first treatment on the surface of the S311: considering that magnetic circuit saturation mainly occurs in a main magnetic circuit rather than a leakage magnetic circuit, magnetic circuit saturation caused by the increase of exciting current mainly considers saturation on the reaction reactance of an armature, thereby being formed by k sd And X is adu Sum of products k sq And X is aqu The product of the d and q axes armature reaction reactance saturation value X under rated exciting current ads And X is aqs The method comprises the steps of carrying out a first treatment on the surface of the S312: x obtained from S311 ads And X is aqs And S309, determining the saturated value of the reactance and the time constant of each order of d and q axes of the motor in consideration of the leakage reactance value and the resistance value of each winding of the d and q axes equivalent circuit.
As an example, a common synchronous machine five-winding model is described in detail, and the five-winding model includes d, q-axis windings obtained by transforming a stator-side three-phase winding dq0, a rotor-side d-axis excitation winding and damping winding, and a rotor-side q-axis damping winding, in which case, the d, q-axis operational reactance can be expressed as:
。
wherein X is d 、X q Represents d, q axis synchronous reactance; t (T) d ' and T d ' represents the d-axis transient and sub-transient short-circuit time constants, T respectively d0 ' and T d0 ' represents the d-axis transient and sub-transient open circuit time constants, respectively; t (T) q ' and T q0 ' indicates the q-axis secondary transient short and open time constants, respectively.
And (3) wiring the DC attenuation test at any rotor position according to the wiring diagram shown in fig. 3, namely, enabling the target motor to be in a first circuit state, connecting an A phase and a B phase of an armature winding of the motor in parallel and then to the positive end of a DC voltage source, connecting a C phase to the negative end of the DC voltage source, and switching on a breaker K1 and switching off a breaker K2. Closing K1, opening K2, armature current i a 、i b And i c As shown in fig. 5, fig. 5 provides a schematic diagram of an armature current, and the test connection is completed according to the wiring diagram shown in fig. 4, that is, the target motor is in the second circuit state for determining the rotor position angle, at this time, the direct current voltage source is connected to the exciting winding, the armature three-phase winding is shorted, the K1 is closed, and the K2 is opened. Closing K1, opening K2, armature current i a 、i b And i c As shown in fig. 6, fig. 6 provides another schematic diagram of the armature current, considering that the field winding is located in the d-axis direction, the dc current attenuation on the field winding only causes the d-axis induced current on the armature side and the q-axis induced current is zero, which is represented by i q As a result of calculating the rotor position angle θ by the following equation, as shown in fig. 8, fig. 7 provides a schematic diagram of the rotor position angle θ= 16.062 degrees, and the d-axis current i in the dc attenuation test shown in fig. 3 is calculated after the rotor position angle is obtained d With q-axis current i q D-axis current i d With q-axis current i q Can be expressed as:
。
as the five-winding model of the synchronous motor is taken as an example for description, after the DC attenuation occurs at the armature end, 3 attenuation components are needed in the d-axis current and the exciting winding current, which correspond to the stator armature winding, the rotor exciting winding and the rotor d-axis damping winding respectively; meanwhile, the q-axis current should have 2 damping components corresponding to the stator armature winding and the rotor q-axis damping winding, respectively. Thus, the time-domain flux form of the d-axis delta current, the q-axis delta current, and the field winding delta current can be expressed as:
。
wherein A is 1 、B 1 And C 1 The amplitude coefficient indicating the amount of attenuation, and λ, μ, and η indicate the attenuation factor of the amount of attenuation. i.e d0 、i q0 And i f0 Respectively representing steady-state values of armature d-axis current, q-axis current and exciting winding current before test start, wherein i f0 Should be 0. In the winding connection of fig. 3, the d, q axis frequency domain voltage signals applied equivalently in this experiment can be expressed as:
。
where U represents the steady state value of the dc voltage.
Further, in the dc attenuation test corresponding to fig. 3, the d-axis, q-axis, and incremental current frequency domain form i of the field winding are calculated by combining the voltage balance equation of the armature terminal d (p)、i q (p) and i f (p) can be expressed as:
。
wherein X is ad Represents the d-axis armature reaction reactance, r s Represents the stator resistance, r f Represents the resistance of the exciting winding, T Ds The leakage time constant of the d-axis damping winding is shown.
Performing time-domain fitting on the corresponding increment current actual measurement value obtained in the test shown in fig. 3 according to the d-axis, q-axis and exciting winding increment current through solution form, transforming a current equation obtained by fitting into a frequency domain, and deriving i d (p)、i q (p) and i f And (p) comparing to obtain the unsaturated values of the transient reactance of each order of d and q axes, the time constant and the armature reaction reactance of the motor as shown in the following table 1:
TABLE 1
Where pu represents per unit value.
The no-load voltage u under rated exciting current can be determined by the no-load characteristic curve and the air gap line of the motor N Value and corresponding value u on the air gap line 0 The ratio is 0.83, thereby obtaining the d-axis saturation coefficient k sd =0.83, q-axis saturation coefficient k sq From this, it can be obtained that the d-axis and q-axis armature reaction reactance saturation value X after saturation of the magnetic circuit is considered ads And X is aqs 0.756 pu and 0.529 pu, respectively, and further can be calculated to obtain the d and q axis order transient reactance and time constants after saturation consideration as shown in the following table 2:
TABLE 2
In this embodiment, the circuit data of the motor in the first circuit state and the second circuit state are used to accurately calculate the performance parameters of the motor, so that the rotor pre-positioning process that is difficult to implement for the large-capacity synchronous motor can be omitted, all parameters of the d-axis equivalent circuit and the q-axis equivalent circuit can be identified at a single arbitrary rotor position, the problem that the saturated value of the parameters cannot be obtained is solved through saturation conversion, and the obtaining efficiency of the performance parameters of the motor is improved.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a motor performance parameter determining device based on the random rotor position direct current attenuation method, which is used for realizing the motor performance parameter determining method based on the random rotor position direct current attenuation method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the motor performance parameter determining device based on the dc attenuation method of any rotor position provided below may be referred to the limitation of the motor performance parameter determining method based on the dc attenuation method of any rotor position hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 8, there is provided a motor performance parameter determining apparatus based on an arbitrary rotor position dc attenuation method, including: a first parameter acquisition module 802, a second parameter acquisition module 804, and a performance parameter determination module 806, wherein:
a first parameter obtaining module 802, configured to obtain a first armature current value, a three-phase voltage value, and an exciting winding current value of a target motor when the target motor is in a first circuit state; the first circuit state represents that an excitation winding of the target motor is short-circuited, a negative end of a preset direct current constant voltage source is connected with any one phase of a three-phase winding of a stator of the target motor, a positive end of the preset direct current constant voltage source and a first breaker are connected in series and then are connected with another two-phase winding of the stator of the target motor, the other two-phase winding is in a parallel state, and a second breaker is connected in parallel between a joint of the first breaker and the other two-phase winding and the negative end of the preset direct current constant voltage source;
a second parameter obtaining module 804, configured to obtain a second armature current value of the target motor when the target motor is in a second circuit state; the second circuit state represents the position of a rotor of the target motor, the three-phase winding of the target motor is short-circuited, the exciting winding short-circuited wire is disconnected, the positive end of the preset direct-current constant-voltage source and the third circuit breaker are connected in series and then connected with one end of the exciting winding, the negative end of the preset direct-current constant-voltage source is connected with the other end of the exciting winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the exciting winding and the negative end of the preset direct-current constant-voltage source;
The performance parameter determining module 806 is configured to input the first armature current value, the second armature current value, the three-phase voltage value, and the exciting winding current value to a performance parameter determining model, to obtain a performance parameter of the target motor.
In an exemplary embodiment, the performance parameter determining model 806 includes a rotor angle determining model, a shaft current determining model, and a parameter unsaturation determining model, where the performance parameter determining module is specifically further configured to input the second armature current value to the rotor angle determining model to obtain a rotor position angle value of the target motor; inputting the rotor position angle value and the first armature current value to the shaft current determination model to obtain a first shaft current value and a second shaft current value of the target motor; determining a first shaft voltage value and a second shaft voltage value of the target motor in the first circuit state according to the three-phase voltage values; inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into the parameter unsaturated value determination model to obtain a performance parameter unsaturated value of the target motor; and taking the unsaturated value of the performance parameter as the performance parameter of the target motor.
In an exemplary embodiment, the parameter unsaturation value determining model includes an incremental current time domain open solution determining model and an incremental current frequency domain open solution determining model, and the performance parameter determining module 806 is specifically further configured to input the exciting winding current value, the first shaft current value and the second shaft current value to the incremental current time domain open solution determining model, so as to obtain incremental current time domain open solution information of the target motor; inputting the first shaft voltage value and the second shaft voltage value into the incremental current frequency domain general solution determining model to obtain incremental current frequency domain general solution information of the target motor; and comparing the incremental current time domain open solution information with the incremental current frequency domain open solution information to obtain the performance parameter unsaturated value of the target motor.
In an exemplary embodiment, the performance parameter determining module 806 is specifically further configured to fit the incremental current time-domain open solution information to the exciting winding current value, so as to obtain a time-domain fit result of the target motor; converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result; and comparing the frequency domain conversion result with the incremental current frequency domain general solution information to determine the performance parameter unsaturated value of the target motor.
In an exemplary embodiment, the apparatus further includes a first saturation parameter determining module, where the first saturation parameter determining module is specifically configured to obtain a first axis saturation coefficient and a second axis saturation coefficient of the target motor; inputting the performance parameter unsaturated value, the first axis saturation coefficient and the second axis saturation coefficient into a reaction reactance saturation value determining model to obtain a reaction reactance saturation value of the target motor; and taking the saturation value of the reaction reactance as a performance parameter of the target motor.
In an exemplary embodiment, the first saturation parameter determining module is specifically further configured to obtain no-load voltage saturation curve information of an exciting current machine end of the target motor; acquiring a rated excitation current value of the target motor, and determining a no-load voltage value corresponding to the rated excitation current value according to the rated excitation current value and no-load voltage saturation curve information of the excitation current machine end; and acquiring air gap line information of the target motor, and determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and the no-load voltage value.
In an exemplary embodiment, the first saturation parameter determining module is specifically further configured to obtain a first product between the performance parameter unsaturated value and the first axis saturation coefficient; obtaining a second product between the performance parameter unsaturated value and the second axis saturation coefficient; and determining the reaction reactance saturation value according to the first product and the second product.
The above-mentioned motor performance parameter determining device based on the arbitrary rotor position direct current attenuation method may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 9. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by the processor, implements a method for determining a motor performance parameter based on a DC decay method for any rotor position. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 9 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application applies, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use, and processing of the related data are required to meet the related regulations.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as Static Random access memory (Static Random access memory AccessMemory, SRAM) or dynamic Random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (8)

1. A method for determining a motor performance parameter based on a DC attenuation method of an arbitrary rotor position, the method comprising:
acquiring a first armature current value, a three-phase voltage value and an excitation winding current value of a target motor under the condition that the target motor is in a first circuit state; the first circuit state represents that an excitation winding of the target motor is short-circuited, a negative end of a preset direct current constant voltage source is connected with any one phase of a three-phase winding of a stator of the target motor, a positive end of the preset direct current constant voltage source and a first breaker are connected in series and then are connected with another two-phase winding of the stator of the target motor, the other two-phase winding is in a parallel state, and a second breaker is connected in parallel between a joint of the first breaker and the other two-phase winding and the negative end of the preset direct current constant voltage source;
Acquiring a second armature current value of the target motor under the condition that the target motor is in a second circuit state; the second circuit state represents the position of a rotor of the target motor, the three-phase winding of the target motor is short-circuited, the exciting winding short-circuited wire is disconnected, the positive end of the preset direct-current constant-voltage source and the third circuit breaker are connected in series and then connected with one end of the exciting winding, the negative end of the preset direct-current constant-voltage source is connected with the other end of the exciting winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the exciting winding and the negative end of the preset direct-current constant-voltage source;
inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determination model to obtain the performance parameter of the target motor; acquiring a first axis saturation coefficient and a second axis saturation coefficient of the target motor; inputting the performance parameters, the first axis saturation coefficient and the second axis saturation coefficient of the target motor into a reaction reactance saturation value determination model to obtain a reaction reactance saturation value of the target motor; taking the reaction reactance saturation value as a performance parameter of the target motor; acquiring no-load voltage saturation curve information of an exciting current machine end of the target motor; acquiring a rated excitation current value of the target motor, and determining a no-load voltage value corresponding to the rated excitation current value according to the rated excitation current value and no-load voltage saturation curve information of the excitation current machine end; and acquiring air gap line information of the target motor, and determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and the no-load voltage value.
2. The method of claim 1, wherein the performance parameter generation model includes a rotor angle determination model, a shaft current determination model, and a parameter unsaturation value determination model, the inputting the first armature current value, the second armature current value, the three-phase voltage value, and the field winding current value to the performance parameter determination model, obtaining the performance parameter of the target motor includes:
inputting the second armature current value to the rotor angle determination model to obtain a rotor position angle value of the target motor;
inputting the rotor position angle value and the first armature current value to the shaft current determination model to obtain a first shaft current value and a second shaft current value of the target motor;
determining a first shaft voltage value and a second shaft voltage value of the target motor in the first circuit state according to the three-phase voltage values;
inputting the exciting winding current value, the first shaft current value, the second shaft current value, the first shaft voltage value and the second shaft voltage value into the parameter unsaturated value determination model to obtain a performance parameter unsaturated value of the target motor;
And taking the unsaturated value of the performance parameter as the performance parameter of the target motor.
3. The method of claim 2, wherein the parameter unsaturation value determination model includes an incremental current time domain general solution determination model and an incremental current frequency domain general solution determination model, and wherein the inputting the field winding current value, the first axis current value, the second axis current value, the first axis voltage value, and the second axis voltage value into the parameter unsaturation value determination model results in the performance parameter unsaturation value of the target motor comprises:
inputting the exciting winding current value, the first shaft current value and the second shaft current value into the incremental current time domain open solution determining model to obtain incremental current time domain open solution information of the target motor;
inputting the first shaft voltage value and the second shaft voltage value into the incremental current frequency domain general solution determining model to obtain incremental current frequency domain general solution information of the target motor;
and comparing the incremental current time domain open solution information with the incremental current frequency domain open solution information to obtain the performance parameter unsaturated value of the target motor.
4. The method of claim 3, wherein said comparing said delta current time-domain pass solution information with said delta current frequency-domain pass solution information to obtain said target motor performance parameter unsaturation value comprises:
Fitting the incremental current time domain open solution information with the exciting winding current value to obtain a time domain fitting result of the target motor;
converting the time domain fitting result into a frequency domain conversion result corresponding to the time domain fitting result;
and comparing the frequency domain conversion result with the incremental current frequency domain general solution information to determine the performance parameter unsaturated value of the target motor.
5. The method of claim 1, wherein said inputting the performance parameter unsaturation value, the first axis saturation coefficient, and the second axis saturation coefficient into a reactive reactance saturation value determination model to obtain a reactive reactance saturation value of the target motor comprises:
acquiring a first product between the performance parameter unsaturated value and the first axis saturation coefficient;
obtaining a second product between the performance parameter unsaturated value and the second axis saturation coefficient;
and determining the reaction reactance saturation value according to the first product and the second product.
6. A motor performance parameter determining apparatus based on an arbitrary rotor position dc attenuation method, the apparatus comprising:
the first parameter acquisition module is used for acquiring a first armature current value, a three-phase voltage value and an excitation winding current value of a target motor under the condition that the target motor is in a first circuit state; the first circuit state represents that an excitation winding of the target motor is short-circuited, a negative end of a preset direct current constant voltage source is connected with any one phase of a three-phase winding of a stator of the target motor, a positive end of the preset direct current constant voltage source and a first breaker are connected in series and then are connected with another two-phase winding of the stator of the target motor, the other two-phase winding is in a parallel state, and a second breaker is connected in parallel between a joint of the first breaker and the other two-phase winding and the negative end of the preset direct current constant voltage source;
A second parameter obtaining module, configured to obtain a second armature current value of the target motor when the target motor is in a second circuit state; the second circuit state represents the position of a rotor of the target motor, the three-phase winding of the target motor is short-circuited, the exciting winding short-circuited wire is disconnected, the positive end of the preset direct-current constant-voltage source and the third circuit breaker are connected in series and then connected with one end of the exciting winding, the negative end of the preset direct-current constant-voltage source is connected with the other end of the exciting winding, and a fourth circuit breaker is connected in parallel between the connection part of the first circuit breaker and the exciting winding and the negative end of the preset direct-current constant-voltage source;
the performance parameter determining module is used for inputting the first armature current value, the second armature current value, the three-phase voltage value and the exciting winding current value into a performance parameter determining model to obtain the performance parameter of the target motor; acquiring a first axis saturation coefficient and a second axis saturation coefficient of the target motor; inputting the performance parameters, the first axis saturation coefficient and the second axis saturation coefficient of the target motor into a reaction reactance saturation value determination model to obtain a reaction reactance saturation value of the target motor; taking the saturation value of the reaction reactance as a performance parameter of the target motor; acquiring no-load voltage saturation curve information of an exciting current machine end of the target motor; acquiring a rated excitation current value of the target motor, and determining a no-load voltage value corresponding to the rated excitation current value according to the rated excitation current value and no-load voltage saturation curve information of the excitation current machine end; and acquiring air gap line information of the target motor, and determining a first axis saturation coefficient and a second axis saturation coefficient of the target motor according to the air gap line information and the no-load voltage value.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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