CN107994825B - Oscillation suppression method, system, device and readable storage medium - Google Patents
Oscillation suppression method, system, device and readable storage medium Download PDFInfo
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- CN107994825B CN107994825B CN201711445071.2A CN201711445071A CN107994825B CN 107994825 B CN107994825 B CN 107994825B CN 201711445071 A CN201711445071 A CN 201711445071A CN 107994825 B CN107994825 B CN 107994825B
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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
- H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
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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
- 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
- H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
Abstract
The application discloses an oscillation suppression method, when being applied to a frequency converter to drive a motor in a VVVF mode, the method comprises the following steps: acquiring instantaneous active current and instantaneous reactive current of a motor; obtaining instantaneous active oscillation components through the instantaneous active current, and obtaining instantaneous reactive oscillation components through the instantaneous reactive current; adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component; obtaining oscillation suppression compensation frequency through the instantaneous oscillation component; modulating a power supply circuit of the motor with the oscillation suppression compensation frequency. The invention inhibits the current oscillation generated under the open-loop control of VVVF, is suitable for both induction motors and permanent magnet synchronous motors, has better parameter consistency and can realize full-band oscillation inhibition. The invention only needs to add a simple software module on the basis of the original control system, and does not need to increase the hardware cost. The application also correspondingly discloses an oscillation suppression system, an oscillation suppression device and a readable storage medium.
Description
Technical Field
The invention relates to the field of motor driving and variable frequency speed regulation, in particular to an oscillation suppression method, system, device and readable storage medium.
Background
The VVVF (Variable Voltage and Variable Frequency) control mode is a control mode which is widely applied to Frequency converters, and has the advantages that the Variable Voltage and Variable Frequency control mode can adapt to most application occasions without depending on motor parameters; the disadvantage is that the control mode can cause the current oscillation of the motor in certain frequency bands due to the adoption of the inverter for supplying power, and trip protection can be generated in severe cases. This current oscillation and dead time, motor winding damping strength, and load variation are all related. For a permanent magnet synchronous motor, the torque fluctuation caused by the oscillation is also easy to cause step loss. The continuous oscillation of the current limits the application range of the VVVF control mode, and is one of the key problems that need to be faced when driving the motor using a PWM (Pulse Width Modulation) inverter.
In the VVVF open-loop control mode, extensive and intensive research has been conducted in academic and engineering circles on the oscillation generation mechanism and the suppression method thereof of the induction motor and the permanent magnet synchronous motor. The PWM power supply method and the reactive power exchange between the motor and the inverter are generally considered to be the main causes of the oscillation, and the main idea of the suppression measure is to increase the calculation of the oscillation amount and amplify the oscillation amount to modify the output frequency or the output voltage of the inverter in a negative feedback manner on the basis of the VVVF pure open loop. The methods currently used are mainly of the following two types:
the output frequency of the inverter is adjusted in real time according to the change of the instantaneous active current, the principle is that the oscillation is considered to cause the equidirectional change of the output torque of the motor, and the change of the active current on the input side can reflect the change of the output torque. The instantaneous active current is easier to obtain than the output torque, so that the current oscillation can be suppressed in a feedback manner by using the change of the active current. However, in this method, when the load changes in a wide range, the output frequency is corrected by the active current, and the oscillation suppression coefficient needs to be adjusted according to the change intensity of the load, which is not good in parameter consistency.
And the other method is to adjust the output voltage of the inverter in real time according to the change of the instantaneous reactive current. The starting point of the method is that the high-frequency oscillation of the current reflects the change of the air gap flux of the motor, and the reactive current and the air gap flux have a corresponding relation and are easier to obtain, so that the output voltage of the inverter is corrected according to the change of the reactive current, the fundamental purpose is to maintain the constant air gap flux and meet the original purpose of VVVF control. The method has good parameter consistency for the induction motor, but has poor oscillation suppression effect on the permanent magnet synchronous motor.
Disclosure of Invention
In view of the above, the present invention provides an oscillation suppression method, system, apparatus and readable storage medium, so as to achieve full-band current oscillation suppression control for induction motors and permanent magnet synchronous motors. The specific scheme is as follows:
an oscillation suppression method is applied to the driving of a motor in a VVVF mode by an inverter, and comprises the following steps:
acquiring instantaneous active current and instantaneous reactive current of a motor;
obtaining instantaneous active oscillation components and instantaneous reactive oscillation components through the instantaneous active current and the instantaneous reactive current;
adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component;
obtaining oscillation suppression compensation frequency through the instantaneous oscillation component;
modulating a power supply circuit of the motor with the oscillation suppression compensation frequency.
Preferably, the process of obtaining the instantaneous active oscillation component by the instantaneous active current and obtaining the instantaneous reactive oscillation component by the instantaneous reactive current includes:
enabling the instantaneous active current to pass through a first active current filter to obtain a first active component;
enabling the instantaneous active current to pass through a second active current filter to obtain a second active component;
subtracting the first active component from the second active component to obtain the instantaneous active oscillation component;
enabling the instantaneous reactive current to pass through a first reactive current filter to obtain a first reactive component;
enabling the instantaneous reactive current to pass through a second reactive current filter to obtain a second reactive component;
subtracting the first reactive component from the second reactive component to obtain the instantaneous reactive oscillation component;
the filter coefficient of the first active current filter is smaller than that of the second active current filter, and the filter coefficient of the first reactive current filter is smaller than that of the second reactive current filter.
Preferably, the step of obtaining the oscillation suppression compensation frequency through the transient oscillation component includes:
and obtaining the oscillation suppression compensation frequency by carrying out proportional control and saturation amplitude limiting on the instantaneous oscillation component.
Preferably, the process of obtaining the instantaneous active current and the instantaneous reactive current of the motor includes:
and carrying out orthogonal decoupling on the three-phase current of the motor according to the vector phase of the regulated voltage to obtain the instantaneous active current and the instantaneous reactive current.
Preferably, the process of modulating the power supply circuit of the motor using the oscillation suppression compensation frequency includes:
returning the oscillation suppression compensation frequency to the slope frequency in a negative feedback mode to obtain an adjustment frequency;
carrying out angle integration on the adjusting frequency to obtain a vector phase of the adjusting voltage;
and modulating a power supply circuit of the motor by using space vector PWM according to the vector phase and the vector amplitude of the adjusting voltage so as to realize stable control of the motor.
Preferably, before the action of returning the oscillation suppression compensation frequency to the ramp frequency in a negative feedback form, the method further includes:
generating an operating frequency corresponding to the motor;
generating the ramp frequency according to set acceleration and deceleration time by using the operating frequency;
and generating the vector amplitude of the adjusting voltage corresponding to the ramp frequency according to a set VF curve.
Correspondingly, the invention also discloses an oscillation suppression system, which is applied to the frequency converter to drive the motor in the VVVF mode, and comprises the following components:
the acquisition module is used for acquiring instantaneous active current and instantaneous reactive current of the motor;
the processing module is used for obtaining an instantaneous active oscillation component through the instantaneous active current, obtaining an instantaneous reactive oscillation component through the instantaneous reactive current, adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component, and finally obtaining oscillation suppression compensation frequency through the instantaneous oscillation component;
and the adjusting module is used for modulating a power supply circuit of the motor by utilizing the oscillation suppression compensation frequency.
Preferably, the adjusting module includes:
the frequency adjusting unit is used for returning the oscillation suppression compensation frequency to the ramp frequency in a negative feedback mode to obtain an adjusting frequency;
the angle integration unit is used for carrying out angle integration on the adjusting frequency to obtain a vector phase of the adjusting voltage;
and the space vector PWM unit is used for modulating a power supply circuit of the motor according to the vector phase and the vector amplitude of the adjusting voltage so as to realize stable control of the motor.
Correspondingly, the invention also discloses an oscillation suppression device, which is applied to the frequency converter to drive the motor in the VVVF mode, and comprises the following components:
a memory for storing a computer program;
a processor for implementing the steps of the oscillation suppression method as defined in any one of the above when executing the computer program.
Accordingly, the present invention also discloses a readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the oscillation suppression method according to any one of the above.
The invention discloses an oscillation suppression method, which is applied to a frequency converter driving a motor in a VVVF mode and comprises the following steps: acquiring instantaneous active current and instantaneous reactive current of a motor; obtaining instantaneous active oscillation components through the instantaneous active current, and obtaining instantaneous reactive oscillation components through the instantaneous reactive current; adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component; obtaining oscillation suppression compensation frequency through the instantaneous oscillation component; modulating a power supply circuit of the motor with the oscillation suppression compensation frequency. The invention adjusts the phase of the motor according to the instantaneous active current and the instantaneous reactive current of the motor, thereby inhibiting the current oscillation generated under the open-loop control of VVVF. The method is suitable for both induction motors and permanent magnet synchronous motors, has good parameter consistency, and can realize full-band current oscillation suppression control. The method can be realized by only adding a simple software module on the basis of the original VVVF open-loop control system, does not need to increase hardware cost, and has low time consumption and cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart illustrating steps of a method for suppressing oscillation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a current decomposition in an oscillation suppression method according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating the sub-steps of a method for suppressing oscillations in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart illustrating the sub-steps of a method for suppressing oscillations in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart illustrating the sub-steps of a method for suppressing oscillations in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of an exemplary embodiment of a vibration suppression system;
fig. 7 is a structural distribution diagram of an exemplary oscillation suppression system according to an embodiment of the present invention.
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.
The embodiment of the invention discloses an oscillation suppression method, which is applied to a frequency converter for driving a motor in a VVVF mode, and comprises the following steps as shown in figure 1:
step S1: acquiring instantaneous active current i _ q and instantaneous reactive current i _ d of the motor;
the motor here includes an induction motor and a permanent magnet synchronous motor.
Generally, the three-phase current of the motor is orthogonally decoupled according to a preset vector phase of the regulated voltage to obtain the instantaneous active current i _ q and the instantaneous reactive current i _ d, which can be seen in fig. 2. Specifically, when orthogonal decoupling is performed, two phases of three-phase currents of the motor may be obtained first, then three-phase and two-phase conversion is performed, and then instantaneous active current i _ q and instantaneous reactive current i _ d corresponding to the vector phase of the regulated voltage may be obtained through rotation conversion. Of course, the instantaneous active current i _ q and the instantaneous reactive current i _ d of the motor can also be obtained by other methods or means, and are not limited herein.
Step S2: obtaining an instantaneous active oscillation component i _ q _ osc through the instantaneous active current i _ q, and obtaining an instantaneous reactive oscillation component i _ d _ osc through the instantaneous reactive current i _ d;
it can be understood that, because the inverter supplies power, the instantaneous active current i _ q and the instantaneous reactive current i _ d both contain oscillation components and current components in normal operation, and the oscillation components can be separated by a certain method and then used for the next step.
Step S3: adding the instantaneous active oscillation component i _ q _ osc and the instantaneous reactive oscillation component i _ d _ osc to obtain an instantaneous oscillation component i _ osc;
step S4, obtaining oscillation suppression compensation frequency △ f through the instantaneous oscillation component i _ osc;
in general, the oscillation suppression compensation frequency △ f can be obtained by scaling and saturation clipping the instantaneous oscillation component i _ osc.
Step S5, modulating a power supply circuit of the motor with the oscillation suppression compensation frequency △ f.
The step S5 is to modulate the inverter bridge unit by the space vector PWM unit mainly using the oscillation suppression compensation frequency △ f, thereby realizing stable control of the motor.
The invention discloses an oscillation suppression method, which is applied to a frequency converter driving a motor in a VVVF mode and comprises the following steps: acquiring instantaneous active current and instantaneous reactive current of a motor; obtaining instantaneous active oscillation components through the instantaneous active current, and obtaining instantaneous reactive oscillation components through the instantaneous reactive current; adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component; obtaining oscillation suppression compensation frequency through the instantaneous oscillation component; modulating a power supply circuit of the motor with the oscillation suppression compensation frequency. The invention adjusts the phase of the motor according to the instantaneous active current and the instantaneous reactive current of the motor, thereby inhibiting the current oscillation generated under the open-loop control of VVVF. The method is suitable for both induction motors and permanent magnet synchronous motors, has good parameter consistency, and can realize full-band current oscillation suppression control. The method can be realized by only adding a simple software module on the basis of the original VVVF open-loop control system, does not need to increase hardware cost, and has low time consumption and cost.
The embodiment of the invention discloses a specific oscillation suppression method, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme.
Specifically, the step S2 may be further divided into a step S21 of acquiring a transient real oscillation component and a step S22 of acquiring a transient reactive oscillation component, wherein, referring to fig. 3, the step S21 includes:
s211: enabling the instantaneous active current i _ q to pass through a first active current filter to obtain a first active component i _ q _ l;
s212: enabling the instantaneous active current i _ q to pass through a second active current filter to obtain a second active component i _ q _ h;
s213: and subtracting the first active component i _ q _ l from the second active component i _ q _ h to obtain the instantaneous active oscillation component i _ q _ osc.
Wherein, considering a waveform component obtained after filtering by a filter, a filter coefficient of the first active current filter is smaller than a filter coefficient of the second active current filter. After filtering by the first active current filter, the obtained first active component i _ q _ l includes an instantaneous active oscillation component and a current component which normally works, and the second active component i _ q _ h obtained after filtering by the second active current filter only includes the current component which normally works, so that the first active component i _ q _ l and the second active component i _ q _ h are differed, and the instantaneous active oscillation component i _ q _ osc can be obtained.
Accordingly, referring to fig. 4, step S22 includes:
s221: enabling the instantaneous reactive current i _ d to pass through a first reactive current filter to obtain a first reactive component i _ d _ l;
s222: enabling the instantaneous reactive current i _ d to pass through a second reactive current filter to obtain a second reactive component i _ d _ h;
s223: subtracting the first reactive component i _ d _ l from the second reactive component i _ d _ h to obtain the instantaneous reactive oscillation component i _ d _ osc;
similar to step S21, the filter coefficient of the first reactive current filter is smaller than the filter coefficient of the second reactive current filter.
Of course, step S21 and step S22 do not have to be in the same order, and are generally performed synchronously.
The embodiment of the invention discloses a specific oscillation suppression method, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme.
Referring to fig. 5, step S5 specifically includes the following steps:
s51, returning the oscillation suppression compensation frequency △ f to the ramp frequency f _ ramp in a negative feedback mode to obtain an adjustment frequency f _ theta;
s52: performing angle integration on the adjusting frequency to obtain a vector phase V _ theta of the adjusting voltage;
s53: and modulating a power supply circuit of the motor by using space vector PWM according to the vector phase V _ theta and the vector amplitude V _ amp of the regulated voltage so as to realize stable control of the motor.
Further, before step S5, the method may further include:
generating an operating frequency f _ set corresponding to the motor;
generating the ramp frequency f _ ramp according to set acceleration and deceleration time by using the operating frequency f _ set;
and generating a vector amplitude V _ amp of the adjusting voltage corresponding to the ramp frequency f _ ramp according to a set VF curve.
Correspondingly, the embodiment of the present invention further discloses an oscillation suppression system, which is applied when the inverter drives the motor in the VVVF mode, as shown in fig. 6, and includes:
the system comprises an acquisition module 1, a control module and a control module, wherein the acquisition module 1 is used for acquiring instantaneous active current i _ q and instantaneous reactive current i _ d of a motor;
the processing module 2 is configured to obtain an instantaneous active oscillation component i _ q _ osc through the instantaneous active current i _ q, obtain an instantaneous reactive oscillation component i _ d _ osc through the instantaneous reactive current i _ d, add the instantaneous active oscillation component i _ q _ osc and the instantaneous reactive oscillation component i _ d _ osc to obtain an instantaneous oscillation component i _ osc, and finally obtain an oscillation suppression compensation frequency △ f through the instantaneous oscillation component i _ osc;
an adjustment module 3 for modulating the supply circuit 4 of the motor with the oscillation suppression compensation frequency △ f.
The method is suitable for both induction motors and permanent magnet synchronous motors, has good parameter consistency, and can realize full-band current oscillation suppression control. The method can be realized by only adding a simple software module on the basis of the original VVVF open-loop control system, does not need to increase hardware cost, and has low time consumption and cost.
The embodiment of the invention discloses a specific oscillation suppression system, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme, and the technical scheme is shown in fig. 7.
Specifically, the obtaining module 1 includes:
a three-phase two-phase conversion unit 11, configured to convert currents ias and ibs in a three-phase current in the power supply circuit 6 into i _ alfa and i _ beta;
and a rotation conversion unit 12 for converting i _ alfa and i _ beta into an instantaneous active current i _ q and an instantaneous reactive current i _ d.
Specifically, the adjusting module 3 includes:
an adjusting frequency unit 31, configured to return the oscillation suppression compensation frequency to a ramp frequency in a negative feedback manner, so as to obtain an adjusting frequency;
an angle integrating unit 32, configured to perform angle integration on the adjustment frequency to obtain a vector phase of the adjustment voltage;
and the space vector PWM unit 33 is configured to modulate a power supply circuit of the motor according to the vector phase and the vector amplitude of the adjustment voltage, so as to realize stable control of the motor.
Specifically, the power supply circuit 4 includes:
the three-phase alternating current power supply 41, the rectifying unit 42, the inverter bridge unit 43 and the motor 44 are connected in sequence.
In addition, the oscillation suppression system may further include:
a frequency command unit 5 that generates an operating frequency f _ set corresponding to the motor;
a ramp frequency generating unit 6 for generating the ramp frequency f _ ramp at a set acceleration/deceleration time by using the operating frequency f _ set;
and a VF curve calculating unit 7 for generating a vector magnitude V _ amp of the adjusted voltage corresponding to the ramp frequency f _ ramp according to a set VF curve.
It is to be understood that the suppression control of the current oscillation in the present embodiment may be accomplished by other methods than the circuits and modules specifically defined in the present embodiment.
The present embodiment has advantageous effects corresponding to the above-described embodiments.
Correspondingly, the embodiment of the invention also discloses an oscillation suppression device, which is applied to the frequency converter to drive the motor in the VVVF mode, and comprises the following components:
a memory for storing a computer program;
a processor for implementing the steps of the oscillation suppression method as defined in any one of the above when executing the computer program.
For details of the oscillation suppression method, reference may be made to the description in the foregoing embodiments, and details are not repeated here.
The present embodiment has advantageous effects corresponding to the oscillation suppressing method in the above-described embodiments.
Correspondingly, the embodiment of the invention also discloses a readable storage medium, wherein a computer program is stored on the readable storage medium, and when being executed by a processor, the computer program realizes the steps of the oscillation suppression method according to any one of the above items.
For details of the oscillation suppression method, reference may be made to the description in the foregoing embodiments, and details are not repeated here.
The present embodiment has advantageous effects corresponding to the oscillation suppressing method in the above-described embodiments.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The oscillation suppression method, system, apparatus and readable storage medium provided by the present invention are described in detail above, and the principle and implementation of the present invention are explained in this document by applying specific examples, and the description of the above examples is only used to help understanding the method and core idea of the present 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 (9)
1. An oscillation suppression method applied to an inverter for driving a motor in a VVVF mode, comprising:
acquiring instantaneous active current and instantaneous reactive current of a motor;
obtaining instantaneous active oscillation components through the instantaneous active current, and obtaining instantaneous reactive oscillation components through the instantaneous reactive current;
adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component;
obtaining oscillation suppression compensation frequency through the instantaneous oscillation component;
modulating a power supply circuit of the motor with the oscillation suppression compensation frequency;
wherein, the process of obtaining instantaneous active oscillation component through the instantaneous active current and obtaining instantaneous reactive oscillation component through the instantaneous reactive current comprises the following steps:
enabling the instantaneous active current to pass through a first active current filter to obtain a first active component;
enabling the instantaneous active current to pass through a second active current filter to obtain a second active component;
subtracting the first active component from the second active component to obtain the instantaneous active oscillation component;
enabling the instantaneous reactive current to pass through a first reactive current filter to obtain a first reactive component;
enabling the instantaneous reactive current to pass through a second reactive current filter to obtain a second reactive component;
subtracting the first reactive component from the second reactive component to obtain the instantaneous reactive oscillation component;
the filter coefficient of the first active current filter is smaller than that of the second active current filter, and the filter coefficient of the first reactive current filter is smaller than that of the second reactive current filter.
2. The oscillation suppression method according to claim 1, wherein the step of obtaining an oscillation suppression compensation frequency from the instantaneous oscillation component comprises:
and obtaining the oscillation suppression compensation frequency by carrying out proportional control and saturation amplitude limiting on the instantaneous oscillation component.
3. The oscillation suppression method of claim 1 wherein said process of obtaining instantaneous active and reactive currents of the motor comprises:
and carrying out orthogonal decoupling on the three-phase current of the motor according to the vector phase of the regulated voltage to obtain the instantaneous active current and the instantaneous reactive current.
4. The oscillation suppression method according to any one of claims 1 to 3, wherein the process of modulating a power supply circuit of the motor with the oscillation suppression compensation frequency includes:
returning the oscillation suppression compensation frequency to the slope frequency in a negative feedback mode to obtain an adjustment frequency;
carrying out angle integration on the adjusting frequency to obtain a vector phase of the adjusting voltage;
and modulating a power supply circuit of the motor by using space vector PWM according to the vector phase and the vector amplitude of the adjusting voltage so as to realize stable control of the motor.
5. The oscillation suppression method according to claim 4, further comprising, before the act of returning the oscillation suppression compensation frequency to the ramp frequency in a negative feedback form:
generating an operating frequency corresponding to the motor;
generating the ramp frequency according to set acceleration and deceleration time by using the operating frequency;
and generating the vector amplitude of the adjusting voltage corresponding to the ramp frequency according to a set VF curve.
6. An oscillation suppression system, applied to an inverter for driving a motor in a VVVF mode, comprising:
the acquisition module is used for acquiring instantaneous active current and instantaneous reactive current of the motor;
the processing module is used for obtaining an instantaneous active oscillation component through the instantaneous active current, obtaining an instantaneous reactive oscillation component through the instantaneous reactive current, adding the instantaneous active oscillation component and the instantaneous reactive oscillation component to obtain an instantaneous oscillation component, and finally obtaining oscillation suppression compensation frequency through the instantaneous oscillation component;
an adjustment module for modulating a supply circuit of the motor with the oscillation suppression compensation frequency;
the processing module specifically comprises:
the first processing unit is used for enabling the instantaneous active current to pass through a first active current filter to obtain a first active component, enabling the instantaneous active current to pass through a second active current filter to obtain a second active component, and subtracting the first active component from the second active component to obtain the instantaneous active oscillation component;
the second processing unit is used for enabling the instantaneous reactive current to pass through a first reactive current filter to obtain a first reactive component, enabling the instantaneous reactive current to pass through a second reactive current filter to obtain a second reactive component, and subtracting the first reactive component from the second reactive component to obtain an instantaneous reactive oscillation component;
the filter coefficient of the first active current filter is smaller than that of the second active current filter, and the filter coefficient of the first reactive current filter is smaller than that of the second reactive current filter.
7. The oscillation suppression system of claim 6 wherein the adjustment module comprises:
the frequency adjusting unit is used for returning the oscillation suppression compensation frequency to the ramp frequency in a negative feedback mode to obtain an adjusting frequency;
the angle integration unit is used for carrying out angle integration on the adjusting frequency to obtain a vector phase of the adjusting voltage;
and the space vector PWM unit is used for modulating a power supply circuit of the motor according to the vector phase and the vector amplitude of the adjusting voltage so as to realize stable control of the motor.
8. An oscillation suppression device, which is applied to an inverter for driving a motor in a VVVF mode, comprises:
a memory for storing a computer program;
a processor for implementing the steps of the oscillation suppression method according to any one of claims 1 to 5 when executing the computer program.
9. A readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the oscillation suppression method according to any one of claims 1 to 5.
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| CN110266244A (en) * | 2019-06-25 | 2019-09-20 | 广东明阳龙源电力电子有限公司 | A kind of cascade connection type frequency converter oscillation suppression method based on virtual impedance |
| CN110336279B (en) * | 2019-07-17 | 2020-11-20 | 国网湖南省电力有限公司 | Electric power system oscillation self-adaptive suppression method, system and medium based on grid-connected converter |
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