CN114629388A - LC resonance suppression method based on virtual admittance remodeling - Google Patents
LC resonance suppression method based on virtual admittance remodeling Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/13—Observer control, e.g. using Luenberger observers or Kalman filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
An LC resonance suppression method based on virtual admittance remodeling belongs to the technical field of motor control. The invention aims at the problem that the LC resonance aggravates the voltage fluctuation of the bus. The method comprises the following steps: bus voltages at two ends of the thin film capacitor with the small capacitance value are filtered by a primary band-pass filter and primary virtual admittance to obtain primary damping current, and further primary damping power is obtained; bus voltages at two ends of the thin film capacitor with the small capacitance value are filtered by a secondary band-pass filter and subjected to secondary virtual admittance to obtain secondary damping current, and secondary damping power is obtained; the primary damping power and the secondary damping power generate alpha-axis damping voltage and beta-axis damping voltage through a damping voltage generation module; adding the alpha axis voltage command and the beta axis voltage command respectively to obtain a final voltage command; and inputting the final voltage command to a PWM inverter to obtain actual three-phase current. The invention carries out impedance remodeling on the inherent harmonic near the resonant frequency based on the virtual admittance, thereby realizing LC resonance suppression.
Description
Technical Field
The invention relates to an LC resonance suppression method based on virtual admittance remodeling, and belongs to the technical field of motor control.
Background
In the field of permanent magnet motor drive control, system reliability, operating life and power density are becoming important points of concern.
Electrolytic capacitor is the core component of traditional motor drive for stabilize direct current side busbar voltage, but it has bulky, short-lived and easy explosion risk scheduling problem. Compared with an electrolytic capacitor, the thin film capacitor has the advantage of long service life. The motor driving system without electrolytic capacitor adopting the thin-film capacitor with small capacitance value has long service life and high power density, and is suitable for electric transmission occasions of fans, pumps and compressors. At present, the motor drive control technology without electrolytic capacitor is in a starting development stage, and still faces some technical problems in the aspects of harmonic suppression and stable operation.
The driving system of the permanent magnet synchronous motor without the electrolytic capacitor mainly comprises a diode uncontrolled rectifier bridge, a small-capacitance value film capacitor, a three-phase voltage inverter and the permanent magnet synchronous motor. Because the capacitance value of the motor driving system without electrolytic capacitor is obviously reduced, LC resonance is easy to occur, and harmonic waves at the natural frequency of the system are amplified, so that the voltage fluctuation of a bus is aggravated, the power quality of a network side is reduced, and even the system is unstable in operation. Therefore, LC resonance suppression is a fundamental problem of stable operation of the driving system without electrolytic capacitor.
Disclosure of Invention
The invention provides an LC resonance suppression method based on virtual admittance remodeling, and aims to solve the problems that in an existing electrolytic capacitor-free permanent magnet synchronous motor driving system, due to the adoption of a small-capacitance thin-film capacitor, LC resonance is caused, harmonic waves near the resonance frequency of the system are obviously amplified, and bus voltage fluctuation is aggravated.
The invention relates to an LC resonance suppression method based on virtual admittance remodeling, which aims at performing LC resonance suppression on an electrolytic capacitor-free permanent magnet synchronous motor driving system comprising a diode rectifier bridge, a small-capacitance value thin film capacitor, a PWM inverter and a permanent magnet synchronous motor PMSM; comprises the steps of (a) preparing a substrate,
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcObtaining the bus voltage u by filtering with a primary band-pass filterdcAfter the first component, a first damping current i is obtained through a first virtual admittancedamp_1(ii) a By a primary damping current idamp_1And bus voltage udcMultiplying to obtain primary damping power Pdamp_1(ii) a The primary virtual admittance is determined according to a primary harmonic frequency;
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcObtaining the bus voltage u by filtering with a secondary band-pass filterdcAfter the secondary component, the secondary damping current i is obtained through secondary virtual admittancedamp_2(ii) a By a secondary damping current idamp_2And bus voltage udcMultiplying to obtain secondary damping power Pdamp_2(ii) a The second virtual admittance is determined according to the second harmonic frequency;
primary damping power Pdamp_1And secondary damping power Pdamp_2Generating alpha-axis damping voltage u by a damping voltage generation moduleα_dampAnd beta axis damping voltage uβ_damp(ii) a Damping the alpha axis by voltageuα_dampAnd alpha axis voltage command u obtained in vector controlα *Adding to obtain final alpha-axis voltage command, and damping beta-axis voltage uβ_dampAnd a beta axis voltage command u obtained in vector controlβ *Adding to obtain a final voltage command of a beta axis; inputting the final voltage instruction of the alpha axis and the final voltage instruction of the beta axis into a PWM inverter to obtain the actual A-phase current iaActual B-phase current ibActual C phase current ic(ii) a Thereby achieving suppression of LC resonance.
According to the LC resonance suppression method based on virtual admittance remodeling, the design of the primary virtual admittance is as follows:
in the formula Yd_1For a virtual admittance magnitude, θd_1Is a virtual admittance angle, omegad_1Is the first harmonic frequency and s is the frequency domain operator.
According to the LC resonance suppression method based on virtual admittance remodeling, the secondary virtual admittance is designed as follows:
in the formula Yd_2For the quadratic virtual admittance magnitude, thetad_2For a quadratic virtual admittance angle, omegad_2The second harmonic frequency.
According to the LC resonance suppression method based on virtual admittance remodeling, the damping voltage generation module generates alpha-axis damping voltage uα_dampAnd beta axis damping voltage uβ_dampThe method comprises the following steps:
in the formula IsL is the stator current amplitude,
the rotor observation position in the vector control is obtained.
According to the LC resonance suppression method based on virtual admittance remodeling, the rotor observation position
Adopting a speed/position observer to carry out alpha axis voltage instruction uα *Beta axis voltage command uβ *Actual alpha axis current iαAnd the actual beta axis current iβIs obtained after treatment.
According to the LC resonance suppression method based on virtual admittance remodeling, the actual alpha axis current iαAnd the actual beta axis current iβUsing Clarke transformation unit to perform actual A-phase current iaActual B-phase current ibAnd the actual C phase current icAnd (5) carrying out transformation to obtain the product.
The invention has the beneficial effects that: the method is used for inhibiting the LC resonance phenomenon caused by the obvious reduction of the capacitance value of the bus capacitor in the grid-side three-phase input electrolytic capacitor-free permanent magnet synchronous motor driving system. The impedance remodeling is carried out on the inherent harmonic wave near the resonant frequency based on the virtual admittance, the bus voltage and the network side current harmonic wave can be effectively inhibited, the LC resonance is further inhibited, and the network side electric energy quality and the stability are obviously improved.
Drawings
FIG. 1 is a schematic block diagram of a virtual admittance remodeling-based LC resonance suppression method according to the present invention;
FIG. 2 is a graph of experimental waveforms of voltage and current harmonics at a first harmonic frequency obtained without applying virtual admittance in an embodiment;
FIG. 3 is a schematic diagram of the voltage obtained in FIG. 2 after FFT;
FIG. 4 is a schematic diagram of the current obtained in FIG. 2 after FFT;
FIG. 5 is a graph of experimental waveforms of voltage and current harmonics at the first harmonic frequency obtained when applying the virtual admittance as set forth in the method of the present invention in an exemplary embodiment; virtual admittance valueIs set to | Yd_10.60p.u. and θd_1＝-0.51p.u.；
FIG. 6 is a schematic diagram of the voltage obtained in FIG. 5 after FFT;
FIG. 7 is a schematic representation of the current obtained in FIG. 5 after FFT;
FIG. 8 is a graph of experimental waveforms for voltage and current harmonics at the second harmonic frequency obtained without applying a virtual admittance in an exemplary embodiment;
FIG. 9 is a schematic diagram of the voltage obtained in FIG. 8 after FFT;
FIG. 10 is a schematic representation of the current obtained in FIG. 8 after FFT;
FIG. 11 is a graph of experimental waveforms of voltage and current harmonics at the second harmonic frequency obtained when applying the virtual admittance as set forth in the method of the present invention in an exemplary embodiment; virtual admittance value set to | Yd_20.45p.u. and θd_2＝-1.08p.u.；
FIG. 12 is a schematic diagram of the voltage obtained in FIG. 11 after FFT;
fig. 13 is a schematic diagram of the current obtained in fig. 11 after FFT transformation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In a first specific embodiment, shown in fig. 1, the invention provides an LC resonance suppression method based on virtual admittance remodeling, which performs LC resonance suppression on an electrolytic capacitor-free permanent magnet synchronous motor driving system including a diode rectifier bridge 109, a small-capacitance thin film capacitor, a PWM inverter 108, and a permanent magnet synchronous motor PMSM 111; comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcThe bus voltage u is obtained by filtering through a primary band-pass filter 206dcAfter the first component, the first damping current i is obtained through the first virtual admittance 204damp_1(ii) a By a primary damping current idamp_1And bus voltage udcThe first multiplication unit 203 multiplies the signals to obtain a primary damping power Pdamp_1(ii) a The primary virtual admittance 204 is determined from the primary harmonic frequency;
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcFiltering by a secondary band-pass filter 207 to obtain a bus voltage udcAfter the second component, the second damping current i is obtained through the second virtual admittance 205damp_2(ii) a By a secondary damping current idamp_2And bus voltage udcThe multiplication operation is carried out by a second multiplication operation unit 202 to obtain secondary damping power Pdamp_2(ii) a The second virtual admittance 205 is determined from the second harmonic frequency;
primary damping power Pdamp_1And secondary damping power Pdamp_2Generation of alpha axis damping voltage u by damping voltage generation module 201α_dampAnd beta axis damping voltage uβ_damp(ii) a Damping the alpha axis by a voltage uα_dampAnd alpha axis voltage command u obtained in vector controlα *Adding to obtain final alpha-axis voltage command, and damping beta-axis voltage uβ_dampAnd a beta axis voltage command u obtained in vector controlβ *Adding to obtain a final voltage command of a beta axis; inputting the final alpha-axis voltage instruction and the final beta-axis voltage instruction into a PWM inverter to obtain the actual A-phase current iaActual B-phase current ibActual C phase current ic(ii) a Thereby achieving suppression of LC resonance.
The design of the band-pass filter is suitable for effectively extracting the first harmonic and the second harmonic. When the frequency of the network side is 50Hz, the first harmonic of the bus voltage is 300Hz, and the second harmonic is 600 Hz. With a switching frequency of 8kHz, the primary band-pass filter 206 is set to:
wherein BPF1(z) represents a primary band-pass filter, and z is a discrete domain operator;
the second order bandpass filter 207 is set to:
wherein BPF2(z) represents a quadratic bandpass filter.
As shown in fig. 1, the vector control in the present embodiment includes: the vector control part comprises a rotating speed regulator 101, a first subtraction unit 102, a second subtraction unit 103, a current regulator 104, a two-phase rotation-to-two-phase stationary coordinate system conversion unit 105, a first addition unit 106, a second addition unit 107, a Clarke conversion unit 112, a two-phase stationary-to-two-phase rotation coordinate system conversion unit 113 and a speed/position observer 114;
the rotational speed command ω obtained by the speed/position observer 114e *With the actual speed omegaeA q-axis current command i is obtained through a rotation speed regulator 101q *Q-axis current command iq *The two-phase stationary to two-phase rotating coordinate system conversion unit 113 converts the actual alpha axis current iαAnd the actual beta axis current iβActual q-axis current i obtained by performing transformationqThe q-axis current difference Δ i is obtained by the first subtraction unit 102qD-axis Current command id *The actual d-axis current i obtained by conversion by the two-phase stationary to two-phase rotating coordinate system conversion unit 113dD-axis current difference delta i is obtained through a second subtraction unit 103dThe two-phase stationary-to-two-phase rotational coordinate system transformation unit 113 combines the observed rotor position obtained by the speed/position observer 114
For the actual alpha axis current iαAnd the actual beta axis current iβActual q-axis current i obtained by performing transformationqAnd the actual d-axis current id(ii) a d-axis current difference Δ idAnd q-axis current difference Δ iqObtaining d-axis voltage command u through current regulator 104d *And q-axis voltage command uq *D-axis voltage command ud *And q-axis voltage command uq *Rotor observed position obtained in conjunction with speed/position observer 114
The alpha-axis voltage command u is obtained by the conversion unit 105 from the two-phase rotation to the two-phase stationary coordinate systemα *And beta axis voltage command uβ *(ii) a Alpha axis voltage command uα *And alpha axis damping voltage uα_dampThe final alpha-axis voltage command and the final beta-axis voltage command u are obtained by the first addition unit 106β *And damping voltage u of beta axisβ_dampA beta axis final voltage instruction is obtained through a second addition operation unit 107; the final alpha axis voltage command and the final beta axis voltage command are processed by the PWM inverter 108 to obtain the actual A phase current iaActual B-phase current ibActual C phase current icActual A phase current iaActual B-phase current ibActual C-phase current icThe actual alpha axis current i is obtained by the conversion of the Clarke conversion unit 112αAnd the actual beta axis current iβ(ii) a In fig. 1, a diode rectifier bridge 109 is connected to a three-phase ac grid 110, the diode rectifier bridge 109 is connected to a PWM inverter 108 via a small-capacitance thin-film capacitor, and the PWM inverter 108 is connected to a permanent magnet synchronous motor PMSM 111.
Further, the primary virtual admittance 204 is designed to:
in the formula Yd_1For a virtual admittance magnitude, θd_1Is a virtual admittance angle, omegad_1Is the first harmonic frequency, s isAnd (5) frequency domain operators.
The secondary virtual admittance 205 is designed as:
in the formula Yd_2For the quadratic virtual admittance magnitude, thetad_2For a quadratic virtual admittance angle, omegad_2The second harmonic frequency.
In the virtual admittance design process, the virtual admittance amplitude is reduced as much as possible, and the harmonic suppression effect is realized by adjusting the virtual admittance angle. Because the overlarge virtual admittance amplitude can increase the machine side power disturbance, and reduce the machine side torque and rotating speed control effect.
According to the traditional active damping control method, a network side current or bus voltage feedback loop is constructed, and the system damping can be effectively increased by changing the power of a motor according to the power balance principle of a network side and a machine side, so that the aim of resonance suppression is fulfilled. The invention is characterized in that only the first harmonic and the second harmonic which are obviously amplified by the resonant frequency are processed, the invention has the advantages of realizing the accurate regulation and control of the harmonic, and reducing the power disturbance of the machine side while effectively inhibiting the system resonance through the design of the virtual admittance.
Still further, the damping voltage generation module 201 generates an α -axis damping voltage uα_dampAnd beta axis damping voltage uβ_dampThe method comprises the following steps:
in the formula IsL is the stator current amplitude,
the rotor observation position in the vector control is obtained.
Still further, the rotor observes the position
By usingThe speed/position observer 114 gives an α -axis voltage command uα *Beta axis voltage command uβ *Actual alpha axis current iαAnd the actual beta axis current iβAnd processing to obtain the product.
The actual alpha axis current iαAnd the actual beta axis current iβThe actual A-phase current i is transformed by a Clarke transformation unit 112aActual B-phase current ibAnd actual C-phase current icAnd (5) carrying out transformation to obtain the product.
The specific embodiment is as follows:
the effectiveness of the LC resonance suppression strategy provided by the invention is verified on a driving system platform of the permanent magnet synchronous motor without electrolytic capacitor. The parameters of the experimental platform are set as follows: the voltage of a power grid is 380V, the frequency of the power grid is 50Hz (corresponding first harmonic is 300Hz, and second harmonic is 600Hz), the direct-current bus capacitor is a film capacitor, the capacitance value is 30 muF, the grid-side inductance is 2.5mH, the d-axis inductance of the motor is 7.5mH, the q-axis inductance is 17.5mH, the number of pole pairs of the rotor is 3, the rated rotation speed is 1500r/min, and the stator resistance is 0.265 omega. All control algorithms in the experiment are completed in the ARM STM32F 103. The switching frequency and the current and voltage sampling value updating frequency are both set to be 8 kHz. The experiment is expressed in a per unit value mode, the voltage base value is 310V, the current base value is 21A, the power base value is 11kW, the frequency base value is 314rad/s, the angle base value is pi rad, and the impedance base value is 15 omega.
As can be seen from fig. 2 to 7, the first harmonic of the bus voltage after applying the virtual admittance can be reduced from 0.17p.u. to 0.11p.u.
As can be seen from fig. 8 to 13, the second harmonic of the bus voltage after applying the virtual admittance can be reduced from 0.05p.u. to 0.03p.u.
Therefore, the method provided by the invention effectively inhibits the natural frequency harmonic wave of the system in the LC resonance inhibition process of the driving system of the electrolytic-capacitor-free permanent magnet synchronous motor.
The LC resonance suppression strategy of the driving system of the permanent magnet synchronous motor without electrolytic capacitor provided by the invention is described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. An LC resonance suppression method based on virtual admittance remodeling is used for LC resonance suppression of an electrolytic capacitor-free permanent magnet synchronous motor driving system comprising a diode rectifier bridge, a small-capacitance value thin film capacitor, a PWM inverter and a permanent magnet synchronous motor PMSM; which is characterized by comprising the following steps of,
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcThe bus voltage u is obtained by filtering through a primary band-pass filter (206)dcAfter the first component, a first damping current i is obtained through a first virtual admittance (204)damp_1(ii) a By a primary damping current idamp_1And bus voltage udcMultiplying to obtain primary damping power Pdamp_1(ii) a The primary virtual admittance (204) is determined from a primary harmonic frequency;
the bus voltage u at two ends of the thin film capacitor with small capacitance valuedcFiltering by a secondary band-pass filter (207) to obtain a bus voltage udcAfter the second component, a second damping current i is obtained through a second virtual admittance (205)damp_2(ii) a By a secondary damping current idamp_2And bus voltage udcMultiplying to obtain secondary damping power Pdamp_2(ii) a The second virtual admittance (205) is determined from a second harmonic frequency;
primary damping power Pdamp_1And secondary damping power Pdamp_2Generating alpha axis damping voltage u by damping voltage generation module (201)α_dampAnd beta axis damping voltage uβ_damp(ii) a Damping the alpha axis by a voltage uα_dampAnd alpha axis voltage command u obtained in vector controlα *Adding to obtain final alpha-axis voltage command, and damping beta-axis voltage uβ_dampAnd a beta axis voltage command u obtained in vector controlβ *Adding to obtain a final voltage command of a beta axis; inputting the final voltage command of alpha axis and the final voltage command of beta axis into PWMInverter for obtaining actual A-phase current iaActual B-phase current ibActual C phase current ic(ii) a Thereby achieving suppression of LC resonance.
2. The virtual admittance remodeling-based LC resonance suppression method of claim 1,
the primary virtual admittance (204) is designed to:
in the formula Yd_1For a virtual admittance magnitude, θd_1Is a virtual admittance angle, omegad_1Is the first harmonic frequency and s is the frequency domain operator.
3. The virtual admittance remodeling-based LC resonance suppression method of claim 2,
the secondary virtual admittance (205) is designed to:
in the formula Yd_2For the quadratic virtual admittance magnitude, thetad_2Is a quadratic virtual admittance angle, omegad_2The second harmonic frequency.
4. The virtual admittance remodeling-based LC resonance suppression method of claim 3,
the damping voltage generation module (201) generates an alpha axis damping voltage uα_dampAnd beta axis damping voltage uβ_dampThe method comprises the following steps:
in the formula IsL is stator currentThe amplitude of the amplitude is,
the rotor observation position in the vector control is obtained.
5. The virtual admittance remodeling-based LC resonance suppression method of claim 4,
rotor position observation
Using a speed/position observer (114) to command the alpha axis voltage uα *Beta axis voltage command uβ *Actual alpha axis current iαAnd the actual beta axis current iβIs obtained after treatment.
6. The virtual admittance remodeling-based LC resonance suppression method of claim 5,
the actual alpha axis current iαAnd the actual beta axis current iβUsing a Clarke transformation unit (112) to correct the actual A-phase current iaActual B-phase current ibAnd the actual C phase current icAnd (5) carrying out transformation to obtain the product.
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