CN109474219A - A kind of parameter of electric machine discrimination method based on frequency dividing coupling - Google Patents

A kind of parameter of electric machine discrimination method based on frequency dividing coupling Download PDF

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CN109474219A
CN109474219A CN201811314679.6A CN201811314679A CN109474219A CN 109474219 A CN109474219 A CN 109474219A CN 201811314679 A CN201811314679 A CN 201811314679A CN 109474219 A CN109474219 A CN 109474219A
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frequency
parameter
phase
electric machine
signal
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CN109474219B (en
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陈炜
孙兴龙
史婷娜
夏长亮
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Tianjin University
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Tianjin University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14Estimation or adaptation of machine parameters, e.g. flux, current or voltage

Abstract

The invention discloses a kind of parameter of electric machine discrimination methods based on frequency dividing coupling, and the parameter of electric machine discrimination method includes: the outlet side that high-frequency detection signal injecting mechanism is deployed in power supply, which is made of signal source and coupling circuit;High-frequency detection signal is generated in the form of fixed frequency by signal source, and the high-frequency signal that signal source generates is directly delivered on the power supply line of permanent magnet synchronous motor by coupling circuit;The voltage or electric current that motor is detected by sensor, obtain high fdrequency component therein, according to the maximum value of high fdrequency component, virtual value, phase information identifying motor parameter after bandpass filter.The present invention can be improved parameter of electric machine identification accuracy, reduce system cost, the on-line parameter identification suitable for motor.

Description

A kind of parameter of electric machine discrimination method based on frequency dividing coupling
Technical field
The present invention relates to Motor Control Field more particularly to a kind of parameter of electric machine discrimination methods based on frequency dividing coupling.
Background technique
With the development of economy and society, requirement of the industrial circle to motor performance is higher and higher, to motor control strategy Control accuracy requirement is also higher and higher.But it is accurate mathematical modulo with control object that the control precision of these control strategies, which is all, Based on type, and the electric parameter of motor is in real-time change.For example, motor operation causes the raising of motor self-temperature The parameter of machine winding resistance can be made to change, the variation of motor load will also result in the variation of machine winding inductance.So To high-precision control motor, the real-time parameter for knowing motor online is just had to.
Traditional parameter of electric machine on-line identification method is usually that partial parameters are set as fixed value, uses motor status equation The on-line identification parameter of electric machine, but if the fixation parameter of electric machine inaccuracy of setting or when being changed due to outside cause, It will lead to the parameter of electric machine picked out and deviation occur.Another method is to be carried out using additional measuring instrument to the parameter of electric machine Line identification, for example utilize power meter torque measurer, the parameters such as the continual copper loss for detecting motor, iron loss, mechanical loss, The parameters of motor are obtained with this.But this method needs to add additional precision equipment, increases hardware cost, no It is suitable for a wide range of promote the use of.
Summary of the invention
The present invention provides a kind of parameter of electric machine discrimination method based on frequency dividing coupling, the present invention can be improved the parameter of electric machine Accuracy is recognized, system cost is reduced, described below suitable for the on-line parameter identification of motor:
A kind of parameter of electric machine discrimination method based on frequency dividing coupling, the parameter of electric machine discrimination method include:
High-frequency detection signal injecting mechanism is deployed in the outlet side of power supply, which is made of signal source and coupling circuit;
High-frequency detection signal is generated in the form of fixed frequency by signal source, and the high-frequency signal that signal source generates passes through coupling electricity Road is directly delivered on the power supply line of permanent magnet synchronous motor;
The voltage or electric current that motor is detected by sensor, obtain high fdrequency component therein, root after bandpass filter According to the maximum value of high fdrequency component, virtual value, phase information identifying motor parameter.
Further, the high-frequency detection signal is generated by independent signal source, high-frequency detection signal and main loop of power circuit Divide the power supply line of multiplying motor or generator.
Wherein, described to have high-frequency signal trap between high frequency electrocardiography point and power grid, high-frequency signal trap is kept away Exempt from high-frequency signal and enter power grid, to prevent power grid inductance bring error.
Further, the parameter of electric machine relational expression specifically:
In formula, uan, ubn, ucnRespectively three-phase windings phase voltage;ia, ib, icRespectively threephase stator winding electric current;ea, eb, ecRespectively three-phase windings back-emf;Ra, Rb, RcFor stator winding resistance;La, Lb, LcFor stator winding equivalent inductance.
Wherein, the method has also got the three-phase windings voltage equation of motor under high frequency condition, specifically:
Wherein,For A phase phase voltage high fdrequency component;For B phase phase voltage high fdrequency component;For C phase phase voltage high frequency Component;For A phase stator winding current;For B phase stator winding current;For C phase stator winding current;F is high-frequency detection Signal frequency.
Wherein, relational expression between high fdrequency component are as follows:
Frequency voltage components are obtained by the relational expressionWith high-frequency current componentBetween amplitude, phase relation.
The beneficial effect of the technical scheme provided by the present invention is that:
1, it is limited to the switching frequency of power device, the frequency that signal is detected in traditional discrimination method is lower, and the present invention has Independent high-frequency detection signal generator can greatly improve detection signal by adjusting the capacitance resistance parameter in generator Frequency, to improve the identification to inductance parameters.
2, the present invention devises the high-frequency detection signal method for implanting of frequency dividing multiplexing motor power-supply wire and winding, does not need to add Add additional hardware device, also do not need the special state that motor seizes up or starts, detects signal and driving signal can It is transmitted simultaneously by power supply line and winding.The driving signal of motor can not be also influenced while detecting voltage and current signals, Not only it had been able to achieve the on-line identification of the parameter of electric machine, but also has improved the accuracy of the parameter of electric machine, has been conducive to the movement to motor and carries out essence Really control.
Detailed description of the invention
Fig. 1 is the schematic diagram of the parameter of electric machine discrimination method based on frequency dividing coupling;
Fig. 2 is a kind of schematic diagram of high-frequency signal trap of the parameter of electric machine discrimination method based on frequency dividing coupling;
Fig. 3 is a kind of schematic diagram of transformer-coupled circuit of the parameter of electric machine discrimination method based on frequency dividing coupling;
Fig. 4 is a kind of schematic diagram of high-frequency detection signal source circuit;
Fig. 5 is permanent magnet synchronous motor equivalent circuit diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further Ground detailed description.
Frequency multiplexing technique is one of common technology in communication engineering, and the channel for transmitting information is divided into several by it Mutual nonoverlapping subchannel, every road signal occupy one of frequency range, will be more using suitable bandpass filter in receiving end Road signal separates, thus signal required for restoring.Such as: carrier telecommunication is the use in communication of power system One of commonly used equipment of frequency multiplexing technique, it, using high voltage transmission line as the channel of wire communication, is the remote of electric system Dynamic, protection, production commander, communication scheduling and administrative service communication provide means.
The schematic diagram of the embodiment of the present invention is as shown in Figure 1.Wherein selection of Motor permanent magnet synchronous motor is as representative.From Fig. 1 In as it can be seen that there are the outlet side that a set of independent high-frequency detection signal injecting mechanism is deployed in power supply, wherein high-frequency detection signal Injecting mechanism is made of signal source and coupling circuit, and high-frequency detection signal is generated in the form of fixed frequency by signal source, signal source The high-frequency signal of generation is directly delivered on the power supply line of permanent magnet synchronous motor by coupling circuit.
There is high-frequency signal trap between high-frequency detection signal decanting point and power supply, is not influencing the driving voltage of motor Under the conditions of avoid high-frequency detection signal from entering power supply.Common high-frequency signal trap, Fig. 2 can be used in the embodiment of the present invention A kind of high-frequency signal trap is shown, which is made of inductance coil, protection element and tuned cell.
High-frequency signal is transmitted on the power supply line of permanent magnet synchronous motor by coupling circuit, and low frequency signal is avoided to enter high frequency Signal generation apparatus, Fig. 3 show a kind of transformer-coupled circuit, can choose different coupling electricity for different signal sources Road.
Fig. 4 shows a kind of high-frequency detection signal source circuit, which can produce a fixed high-frequency signal, defeated Frequency f=1/ [1.278 (R out2+RP)C1], it is seen that the frequency of its high-frequency signal depends on resistance R2、RPWith capacitor C1Selection. Testing agency is made of voltage sensor, current sensor and bandpass filter, and voltage sensor and current sensor measurement are forever The line voltage signal and stator winding current signal of magnetic-synchro motor, line voltage signal and stator winding current signal pass through band logical It is sent into parameter of electric machine real time computer after filter filtering and obtains the real-time parameter of electric machine.
The three-phase windings voltage equation of motor under the conditions of power frequency can be obtained according to Fig. 5:
In formula, uan, ubn, ucnRespectively three-phase windings phase voltage;ia, ib, icRespectively threephase stator winding electric current;ea, eb, ecRespectively three-phase windings back-emf;Ra, Rb, RcFor stator winding resistance;La, Lb, LcFor stator winding equivalent inductance.
Traditional on-line parameter identification is not in the case where adding additional equipment, it is necessary to anti-by acquiring real-time winding Electromotive force or air gap flux linkage recognize parameter, and both of which is difficult to accurately measure, and due to the inductance differences of each phase The difference of three-phase windings inductance almost can not be identified in very little, traditional parameters discrimination method.It is proposed by the present invention to be coupled based on frequency dividing Parameter of electric machine on-line identification look for another way, using high-frequency detection signal by the phase voltage component of the counter electromotive force of power frequency and high frequency It is separated with impedance voltage component, and due to XLThe difference of three-phase windings impedance has also been enlarged in=2 π fL, frequency while raising It is different, so that parameter of electric machine identification is become more accurate.Formula (2) is the three-phase windings voltage equation of motor under high frequency condition:
Wherein,For A phase phase voltage high fdrequency component;For B phase phase voltage high fdrequency component;For C phase phase voltage high frequency Component;For A phase stator winding current;For B phase stator winding current;For C phase stator winding current;F is high-frequency detection Signal frequency.
Three-phase high-frequency voltage signal is implanted sequentially circuit, in high-frequency voltage signalWhen injection circuit, high frequency voltage letter Number Stop injection, at this time frequency voltage components:
Relational expression between high fdrequency component at this time are as follows:
Frequency voltage components by measuring at this timeWith high-frequency current componentBetween amplitude, phase relation, i.e., It can determine A phase stator winding inductance value and winding resistance, can similarly obtain the stator winding inductance and winding resistance of B phase, C phase Value.
It needs to further illustrate, specific implementation method of the invention is extensive, and embodiment made herein only elaborates Effect only has chosen a kind of preferred case study on implementation and is analyzed, and certain details can be varied in actual use, including motor Type, the combination of other component and assemble, these deformations and application all should belong to the scope of the present invention.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention Serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention.

Claims (6)

1. a kind of parameter of electric machine discrimination method based on frequency dividing coupling, which is characterized in that the parameter of electric machine discrimination method includes:
High-frequency detection signal injecting mechanism is deployed in the outlet side of power supply, which is made of signal source and coupling circuit;
High-frequency detection signal is generated in the form of fixed frequency by signal source, and the high-frequency signal that signal source generates is straight by coupling circuit It connects on the power supply line for being transmitted to permanent magnet synchronous motor;
The voltage or electric current that motor is detected by sensor, obtain high fdrequency component therein, according to height after bandpass filter Maximum value, virtual value, the phase information identifying motor parameter of frequency component.
2. a kind of parameter of electric machine discrimination method based on frequency dividing coupling according to claim 1, which is characterized in that the height Frequency detection signal is generated by independent signal source, high-frequency detection signal and main loop of power circuit frequency dividing multiplying motor or generator Power supply line.
3. it is according to claim 1 it is a kind of based on frequency dividing coupling parameter of electric machine discrimination method, which is characterized in that it is described There is high-frequency signal trap between high frequency electrocardiography point and power grid, high-frequency signal trap avoids high-frequency signal from entering power grid, To prevent power grid inductance bring error.
4. a kind of parameter of electric machine discrimination method based on frequency dividing coupling according to claim 1, which is characterized in that the electricity Machine parameter specifically:
In formula, uan, ubn, ucnRespectively three-phase windings phase voltage;ia, ib, icRespectively threephase stator winding electric current;ea, eb, ec Respectively three-phase windings back-emf;Ra, Rb, RcFor stator winding resistance;La, Lb, LcFor stator winding equivalent inductance.
5. a kind of parameter of electric machine discrimination method based on frequency dividing coupling according to claim 1, which is characterized in that the side Method has also got the three-phase windings voltage equation of motor under high frequency condition, specifically:
Wherein,For A phase phase voltage high fdrequency component;For B phase phase voltage high fdrequency component;For C phase phase voltage high fdrequency component;For A phase stator winding current;For B phase stator winding current;For C phase stator winding current;F is high-frequency detection signal frequency Rate.
6. a kind of parameter of electric machine discrimination method based on frequency dividing coupling according to claim 5, which is characterized in that high frequency division Relational expression between amount are as follows:
Frequency voltage components are obtained by the relational expressionWith high-frequency current componentBetween amplitude, phase relation.
CN201811314679.6A 2018-11-06 2018-11-06 Motor parameter identification method based on frequency division coupling Active CN109474219B (en)

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CN111123105A (en) * 2020-02-14 2020-05-08 东南大学 Motor turn-to-turn short circuit fault diagnosis method based on high-frequency signal injection
CN111293931A (en) * 2020-03-17 2020-06-16 天津大学 High-precision low-noise brushless direct current motor position sensorless control system and method

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CN110907824A (en) * 2019-11-06 2020-03-24 天津工业大学 Motor fault detection system based on high-frequency signal coupling injection
CN111123105A (en) * 2020-02-14 2020-05-08 东南大学 Motor turn-to-turn short circuit fault diagnosis method based on high-frequency signal injection
CN111123105B (en) * 2020-02-14 2021-11-30 东南大学 Motor turn-to-turn short circuit fault diagnosis method based on high-frequency signal injection
CN111293931A (en) * 2020-03-17 2020-06-16 天津大学 High-precision low-noise brushless direct current motor position sensorless control system and method

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