CN116961449B - Active damping parameter self-adaptive adjusting method for third harmonic injection matrix converter - Google Patents
Active damping parameter self-adaptive adjusting method for third harmonic injection matrix converter Download PDFInfo
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Abstract
The application discloses an active damping parameter self-adaptive adjustment method of a third harmonic injection matrix converter, which relates to the field of third harmonic injection matrix converters, and is based on the fact that three-phase input voltage of the third harmonic injection matrix converter is converted into a dq coordinate system and then passes through a high-pass filter to obtain high-frequency harmonic components of d and q-axis input voltage, so that harmonic component reference values are calculated and obtainedBy referencing harmonic components toThreshold th ie The difference value of the damping coefficient is input into a PI controller, and the adjusted active damping parameter can be determined according to the output of the PI controller. The method provides a method for adaptively adjusting the active damping parameters, the method does not need to establish an accurate and complex mathematical model, and the adaptive adjustment can ensure that the system can be kept stable under different working conditions and has minimum interference to the normal operation of the system.
Description
Technical Field
The application relates to the field of third harmonic injection matrix converters, in particular to an active damping parameter self-adaptive adjustment method of a third harmonic injection matrix converter.
Background
The third harmonic injection matrix converter (3 TSMC) is a novel Matrix Converter (MC) based on a mixed third harmonic injection rectifier, and a common topology structure diagram of the third harmonic injection matrix converter is shown in fig. 1. The third harmonic injection matrix converter inherits most of the advantages of the traditional matrix converter, such as the advantages of no need of a large-capacity energy storage link, small volume, light weight, high reliability, bidirectional energy flow and the like, and meanwhile, the three-harmonic injection matrix converter also has the advantages of decoupling of a rectifying stage and an inverting stage, strong reactive power control capability, small current stress and the like, so that the three-harmonic injection matrix converter is more suitable for application occasions such as alternating current motor driving, wind energy conversion systems, flexible alternating current transmission, aviation starting power generation systems and the like.
However, the LC filter at the input side of the 3TSMC also brings stability problems while filtering out high frequency harmonics at the converter side and high frequency harmonics of the power supply voltage. The resonance spike of the LC filter at the input side of the 3TSMC amplifies the harmonics around the system resonance frequency point, thereby inducing severe oscillations and even instability of the system. At present, aiming at the resonance peak problem of the LC filter at the input side of the 3TSMC, two common methods are a passive damping method and an active damping method. The passive damping method is simple in implementation process, but requires additional passive resistance, and increases certain device cost and power loss. Compared with a passive damping method, the active damping method can improve the stability of the system through a control algorithm without adding a passive resistor, and is widely paid attention to students. The existing active damping method can effectively improve the stability of the 3TSMC input side, but the selected active damping parameters directly affect the stability adjustment, when the active damping parameters are not reasonably selected, the problem that the system oscillation cannot be effectively damped or the normal operation working condition of the system is interfered can be caused, so that the active damping parameters are often calculated and given in advance by depending on an accurate mathematical model at present, the calculated amount is large, and the difficulty of the implementation method is large.
Disclosure of Invention
Aiming at the problems and the technical requirements, the applicant provides an active damping parameter self-adaptive adjustment method of a third harmonic injection matrix converter, and the technical scheme of the application is as follows:
an active damping parameter self-adaptive adjusting method of a third harmonic injection matrix converter, the active damping parameter self-adaptive adjusting method comprises the following steps:
three-phase input voltage of the third harmonic injection matrix converter is collected and converted into a dq coordinate system to obtain d-axis input voltage u id And q-axis inputVoltage u iq ；
Input voltage u to d-axis id And q-axis input voltage u iq Obtaining a d-axis input voltage high-frequency harmonic component u through a high-pass filter ide And a q-axis input voltage high-frequency harmonic component u iqe ；
High-frequency harmonic component u based on d-axis input voltage ide And a q-axis input voltage high-frequency harmonic component u iqe Calculating to obtain harmonic component reference value
Reference values of harmonic componentsThreshold th ie The difference value of the first harmonic is input into a PI controller, and the adjusted active damping parameter is determined according to the output of the PI controller and is used for realizing active damping control of the third harmonic injection matrix converter.
The further technical proposal is that the harmonic component reference value is calculatedComprising the following steps:
calculating the high-frequency harmonic component u of d-axis input voltage ide And a q-axis input voltage high-frequency harmonic component u iqe Root mean square value of (2)
According to root mean square value u ie Obtaining harmonic component reference values
According to the further technical proposal, according to the root mean square value u ie Obtaining harmonic component reference valuesComprising the following steps:
for root mean squareValue u ie Through a cut-off frequency f LPF To filter out the pulsation component to obtain harmonic component reference values is the Laplace operator.
It is further characterized by that when the harmonic component reference valueThreshold th ie Difference of->When the PI controller increases the current active damping parameter and outputs the current active damping parameter;
when the harmonic component is referencedThreshold th ie Difference of->When the PI controller reduces the current active damping parameters and outputs the current active damping parameters;
when the harmonic component is referencedThreshold th ie Difference of->And when the PI controller is used, the current active damping parameters are kept unchanged and output.
The further technical scheme is that the method for determining the adjusted active damping parameters according to the output of the PI controller comprises the following steps:
and taking the output of the PI controller after passing through the limiter as an adjusted active damping parameter, wherein the adjusted active damping parameter of the output of the limiter is a non-negative number.
The further technical scheme is that when the output of the PI controller is negative, the active damping parameter after the output adjustment is 0 after passing through the limiter.
The further technical proposal is that the threshold value th ie ＝0.1％×u im ，u im Is the amplitude of the fundamental component of the input voltage.
The technical proposal is that,
wherein f HPF Is the cut-off frequency of the high-pass filter, s is the laplace operator.
The further technical proposal is that the cut-off frequency f of the high-pass filter HPF ＝2000Hz。
The further technical scheme is that the obtained adjusted active damping parameters are adaptively adjusted under different system working conditions, and the active damping parameters are the minimum value for stabilizing the system under the current working conditions.
The beneficial technical effects of this application are:
the application discloses an active damping parameter self-adaptive adjustment method of a third harmonic injection matrix converter, which provides a method for carrying out self-adaptive adjustment on active damping parameters. On the other hand, the regulated active damping parameter obtained by the method is the minimum value for ensuring the stability of the system, so that the interference of the active damping method under the parameter on the normal operation of the system is minimum.
In addition, the high-pass filter and the low-pass filter used in the self-adaptive adjusting method are respectively a digital first-order high-pass filter and a digital first-order low-pass filter, so that the calculated amount is small, the algorithm complexity is low, and the engineering implementation is easy.
Drawings
Fig. 1 is a block diagram of a third harmonic injection matrix converter.
FIG. 2 is a control block diagram of an active damping parameter adaptive adjustment method according to one embodiment of the present application.
Fig. 3 is a graph of simulation results when the active damping parameter is fixedly set to 0.05S.
Fig. 4 is a diagram of simulation results when the active damping parameter is adjusted to be fixedly set to 0.4S while keeping other parameters unchanged in the simulation example of fig. 3.
FIG. 5 is a graph of simulation results when the active damping parameters are adaptively adjusted using the active damping parameter adaptive adjustment method of the present application, with other parameters remaining unchanged in the simulation example of FIG. 3.
Detailed Description
The following describes the embodiments of the present application further with reference to the accompanying drawings.
The application discloses an active damping parameter self-adaptive adjustment method of a third harmonic injection matrix converter, please refer to a control block diagram shown in fig. 2, the active damping parameter self-adaptive adjustment method comprises the following control processes:
1. three-phase input voltage u of three-harmonic injection matrix converter ia 、u ib And u ic And converting to dq coordinate system to obtain d-axis input voltage u id And q-axis input voltage u iq This step is typically achieved by a phase locked loop.
2. Input voltage u to d-axis id And q-axis input voltage u iq Obtaining a d-axis input voltage high-frequency harmonic component u through a high-pass filter ide And a q-axis input voltage high-frequency harmonic component u iqe Expressed as:
wherein f HPF Is the cut-off frequency of the high-pass filter, s is the laplace operator.
In one embodiment, the cut-off frequency f of the high pass filter HPF =2000 Hz to ensure a faster response speed and better filtering effect.
3. High-frequency harmonic component u based on d-axis input voltage ide And q-axis inputVoltage high frequency harmonic component u iqe Calculating to obtain harmonic component reference value
Includes first calculating the high-frequency harmonic component u of d-axis input voltage ide And a q-axis input voltage high-frequency harmonic component u iqe Root mean square value of (2)Then according to root mean square value u ie Obtaining harmonic component reference value->
In one embodiment, for the root mean square value u ie Through a cut-off frequency f LPF To filter out the ripple component to obtain a harmonic component reference value
4. Reference values of harmonic componentsThreshold th ie Is input to a PI controller, and an adjusted active damping parameter is determined according to the output of the PI controller>
At the reference value of harmonic componentThreshold th ie Difference of->After input to the PI controller, the transfer function of the PI controller +.>k p Is a proportionality coefficient, k I Is an integral coefficient, and the adjustment condition of the PI controller on the active damping parameter is as follows:
(1) When the harmonic component is referencedThreshold th ie Difference of->And when the PI controller increases the current active damping parameters and outputs the current active damping parameters.
(2) When the harmonic component is referencedThreshold th ie Difference of->And when the PI controller reduces the current active damping parameters and outputs the current active damping parameters.
(3) When the harmonic component is referencedThreshold th ie Difference of->And when the PI controller is used, the current active damping parameters are kept unchanged and output.
Wherein the threshold value th ie ＝0.1％×u im ，u im Is the amplitude of the fundamental component of the input voltage.
In addition, in order to avoid deterioration of the damping capacity of the system when the output of the PI controller is negative, the output of the PI controller is not directly used as an adjusted active damping parameter, but the output of the PI controller after the output of the PI controller is subjected to the limiter is used as the adjusted active damping parameterWhen the output of the PI controller is non-negative, the limiter directly outputs the PI controllerOutput as adjusted active damping parameter +.>Outputting; when the output of the PI controller is negative, the active damping parameter after the output adjustment is 0 after the output of the amplitude limiter. The active damping parameter after regulation of the limiter output is therefore +.>Always non-negative, avoiding deteriorating the damping capacity of the system. The obtained adjusted active damping parameters are self-adaptively adjusted under different system working conditions, and the active damping parameters are the minimum value which enables the system to be stable under the current working conditions.
Adjusted active damping parametersActive damping control for implementing a third harmonic injection matrix converter, comprising +.>Calculating to obtain damping current i ide And u iqe The method comprises the following steps of:
the damping component of the active power of the system can then be calculatedDamping component P of active power of system e The active damping control is realized by being added to reference values of the output voltage and the third harmonic injection current, so that active damping control on a Y bridge arm and an inverter three-phase bridge arm is realized, and specific realization of the active damping control can refer to the existing active damping control method.
In order to verify the effectiveness of the control method, a simulation model of 3TSMC is built in MATLAB/Simulink, and simulation parameters are set as follows: the amplitude of the power supply phase voltage is 100V/50Hz, the input filter inductance is 0.25mH, the internal resistance of the input filter inductance is 0.1 omega, the input filter capacitance is 10 mu F, the load resistance is 10 omega, and the load inductance is 5mH.
The simulation results for 3TSMC are shown in fig. 3 when the active damping parameter is fixedly set to 0.05S. The active damping control method can provide insufficient damping, the system oscillates, the THD of the power supply current is 10.12%, the harmonic content near the resonance frequency is 3.30%, and the harmonic content near the resonance frequency is 0.12%.
When the active damping parameter is fixedly set to 0.4S, the simulation result of the 3TSMC is shown in fig. 4, the system can be kept stable, the THD of the power supply current is 1.88%, and the harmonic content at the resonance frequency is about 0.81%. At this time, however, the damping component P of the system active power e And the system is large and is easy to interfere with the normal operation of the system.
When the active damping parameter self-adaptive adjustment method is adopted, the simulation result of the 3TSMC is shown in fig. 5, the feedforward coefficient is self-adaptively adjusted to be near 0.2S, the THD of the power supply current is 1.21%, and the harmonic content near the resonance frequency is 0.46%. At this time, when the system is kept stable, the damping power of the system is obviously reduced compared with that of the active damping parameter set to 0.4S, so that the interference of the active damping method on the normal operation of the system is further reduced, and the harmonic distortion rate of the power supply current is further reduced.
What has been described above is only a preferred embodiment of the present application, which is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are to be considered as being included within the scope of the present application.
Claims (7)
1. The active damping parameter self-adaptive adjustment method of the third harmonic injection matrix converter is characterized by comprising the following steps of:
three-phase input voltage of third harmonic injection matrix converter is collected and converted intoThe coordinate system is taken->Shaft input voltageAnd->Shaft input voltage +.>；
For a pair ofShaft input voltage +.>And->Shaft input voltage +.>Obtaining +.>Shaft input voltage high-frequency harmonic component->And->Shaft input voltage high-frequency harmonic component->；
Based onShaft input voltage high-frequency harmonic component->And->Shaft input voltage high-frequency harmonic component->Calculating to obtain harmonic component reference value->Comprising: calculate->Shaft input voltage high-frequency harmonic component->And->Shaft input voltage high-frequency harmonic component->Root mean square value>For root mean square value->Pass through the cut-off frequency to be +.>To filter out the pulsating component to obtain the harmonic component reference value +.>，/>Is a Laplacian operator;
reference values of harmonic componentsThreshold value->The difference value of the output of the PI controller is input into a PI controller, the output of the PI controller after passing through a limiter is used as an adjusted active damping parameter, the adjusted active damping parameter output by the limiter is a non-negative number, and the adjusted active damping parameter is used for realizing active damping control of the third harmonic injection matrix converter.
2. The method for adaptive adjustment of active damping parameters according to claim 1,
when the harmonic component is referencedThreshold value->Difference of->When the PI controller increases the current active damping parameter and outputs the current active damping parameter;
when the harmonic component is referencedThreshold value->Difference of->When the PI controller reduces the current active damping parameters and outputs the current active damping parameters;
when the harmonic waveComponent reference valueThreshold value->Difference of->And when the PI controller is used, the current active damping parameters are kept unchanged and output.
3. The adaptive adjustment method of active damping parameters according to claim 1, wherein when the output of the PI controller is negative, the output adjusted active damping parameter is 0 after passing through the limiter.
4. The method for adaptive adjustment of active damping parameters according to claim 1, wherein the threshold value，/>Is the amplitude of the fundamental component of the input voltage.
5. The method for adaptive adjustment of active damping parameters according to claim 1,
wherein,for the cut-off frequency of the high-pass filter, < >>Is a laplace operator.
6. The method of adaptive tuning of active damping parameters of claim 5, wherein the cut-off frequency of the high pass filter。
7. The method according to claim 1, wherein the obtained adjusted active damping parameter is adaptively adjusted under different system working conditions, and is a minimum value that stabilizes the system under the current working condition.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106972757A (en) * | 2017-04-18 | 2017-07-21 | 中南大学 | A kind of control method of active third-harmonic zero-sequence voltage matrix converter |
| CN108880209A (en) * | 2018-08-13 | 2018-11-23 | 南京航空航天大学 | A kind of active damping control method of active third-harmonic zero-sequence voltage matrix converter |
| CN116191899A (en) * | 2023-03-02 | 2023-05-30 | 南京航空航天大学 | Control method of third harmonic injection matrix converter based on virtual impedance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972757A (en) * | 2017-04-18 | 2017-07-21 | 中南大学 | A kind of control method of active third-harmonic zero-sequence voltage matrix converter |
| CN108880209A (en) * | 2018-08-13 | 2018-11-23 | 南京航空航天大学 | A kind of active damping control method of active third-harmonic zero-sequence voltage matrix converter |
| CN116191899A (en) * | 2023-03-02 | 2023-05-30 | 南京航空航天大学 | Control method of third harmonic injection matrix converter based on virtual impedance |
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