CN113612403B - Multiphase rectification/inversion topology and single-phase control method, system and device thereof - Google Patents
Multiphase rectification/inversion topology and single-phase control method, system and device thereof Download PDFInfo
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- CN113612403B CN113612403B CN202110832574.5A CN202110832574A CN113612403B CN 113612403 B CN113612403 B CN 113612403B CN 202110832574 A CN202110832574 A CN 202110832574A CN 113612403 B CN113612403 B CN 113612403B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses a multiphase rectification/inversion topology and a single-phase control method, a system and a device thereof, which are used for acquiring alternating-current side voltage and alternating-current side current corresponding to a target in the multiphase rectification/inversion topology, and utilizing an orthogonal signal generator to obtain two voltage orthogonal signals corresponding to the alternating-current side voltage and two current orthogonal signals corresponding to the alternating-current side current; performing PLL operation on the two voltage orthogonal signals to obtain phase information of the alternating-current side voltage; constructing a reference current based on the phase information, and calculating the reference current and two current orthogonal signals through a PI control loop to obtain an alpha-axis current regulating quantity; and adding the alpha-axis current regulating quantity and the alpha-axis voltage orthogonal signal, multiplying the sum by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling a power switch device corresponding to the target based on the modulation parameter. Therefore, the method and the device can realize independent control of each phase of the multi-phase rectification/inversion topology, and are beneficial to development and application of the multi-phase rectification/inversion topology.
Description
Technical Field
The invention relates to the field of current transformation, in particular to a multiphase rectification/inversion topology and a single-phase control method, system and device thereof.
Background
Currently, for a three-phase rectification/inversion topology, the commonly adopted control logic is as follows: the method comprises the steps of taking abc three-phase alternating-current side voltage and abc three-phase alternating-current side current of a three-phase rectification/inversion topology as a space vector whole, obtaining dq two-phase voltage and dq two-phase current through Clark coordinate transformation (converting an abc coordinate system into an alpha beta coordinate system) and Park coordinate transformation (converting the alpha beta coordinate system into a dq coordinate system), then regulating the dq two-phase voltage and the dq two-phase current through a PI (proportional integral) control loop, obtaining a three-phase modulation value through iPark coordinate transformation (converting the dq coordinate system into the alpha beta coordinate system) and iClark coordinate transformation (converting the alpha beta coordinate system into the abc coordinate system) after regulating the regulating value obtained by the PI control loop, and adjusting driving signals for controlling all power switching devices in the three-phase rectification/inversion topology based on the three-phase modulation value, thereby realizing the conversion control of three-phase rectification/inversion.
However, in the whole control process, the three-phase alternating-current side component is considered as a space vector whole, that is, the control cannot be successfully completed if any cross-current side component is absent or any cross-current side component has a problem, so that the system cannot normally work when the system has a phase error, a phase loss and three-way access single-phase. At present, only several conditions causing the system to work abnormally can be identified, an alarm is given in time, the system is controlled to stop, and the condition that the system cannot work normally cannot be improved.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a multiphase rectification/inversion topology and a single-phase control method, a system and a device thereof, which can realize independent control of each phase of the multiphase rectification/inversion topology, namely the control of each phase is independent, when any phase is in a phase failure or a phase error, the control of the rest phases cannot be influenced, and the rest phases can still work normally, thereby being beneficial to the development and application of the multiphase rectification/inversion topology; moreover, no matter the system is in a positive sequence, a negative sequence, a zero sequence or other three-phase forms, the rectification/inversion control can be realized, and the flexibility of the system is ensured to the maximum extent.
In order to solve the technical problem, the invention provides a single-phase control method based on a multiphase rectification/inversion topology, which comprises the following steps:
obtaining alternating-current side voltage u corresponding to target in multiphase rectification/inversion topology s And an alternating side current i Ls And using a quadrature signal generator to obtain the voltage u on the AC side s Corresponding two orthogonal signals u s_alpha 、u s_beta And the AC side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta (ii) a Wherein the target phase is any phase;
the two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s Phase information ω · t of (d);
constructing a reference current based on the phase information ω · t, and combining the reference current and the two orthogonal signals i Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha ；
Adjusting the current by an amount i * Ls_alpha With said quadrature signal u s_alpha And multiplying the added values by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling the power switch device corresponding to the target based on the modulation parameter so as to realize independent control of each phase of the multiphase rectification/inversion topology.
Preferably, the orthogonal signal generator is a frequency-adaptive orthogonal signal generator directly established in the z-domain.
Preferably, the transfer function of the quadrature signal generator is:
wherein x (z) is an input signal of the quadrature signal generator; y is α (z) and y β (z) two orthogonal signals output by said orthogonal signal generator; omega 0 Is the angular frequency of the input signal; t is a unit of s Is the sampling frequency; cos (omega) 0 T s )、sin(ω 0 T s ) Adaptive parameters for the quadrature signal generator; and xi is a preset constant.
Preferably, the voltage u on the alternating side is obtained s After the phase information ω · t, the single-phase control method based on the multiphase rectification/inversion topology further includes：
And adjusting the current angular frequency corresponding to the orthogonal signal generator according to the angular frequency omega corresponding to the phase information omega.t, so that the orthogonal signal generator realizes frequency self-adaptation.
Preferably, the two orthogonal signals u are combined s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s The process of phase information ω · t of (a), comprising:
the two orthogonal signals u s_alpha 、u s_beta Obtaining two voltage signals u under dq coordinate system through Park coordinate transformation s_q 、u s_d ；
The voltage signal u is converted into a voltage signal s_d Is discarded and 0 is subtracted from the voltage signal u s_q Obtaining a voltage difference value epsilon, and regulating the voltage difference value epsilon through PI to obtain an angular frequency regulating quantity;
adjusting the angular frequency to a preset angular frequency omega 1 Adding to obtain the AC side voltage u s And integrating the angular frequency omega to obtain the alternating-current side voltage u s Phase information ω · t of (a);
adjusting the two orthogonal signals u based on the phase information ω · t s_alpha 、u s_beta Phase values used in the Park coordinate transformation.
Preferably, a reference current is constructed based on the phase information ω · t, and the reference current and the two quadrature signals i are combined Ls_alpha 、i Ls_beta The current regulating quantity i is obtained by operation of a PI control loop * Ls_alpha The process of (2), comprising:
constructing a reference current I based on the phase information ω · t ref sin (ω · t) and, based on the phase information ω · t, converting the two orthogonal signals i Ls_alpha 、i Ls_beta Carrying out Park coordinate transformation to obtain two current signals i under dq coordinate system Ls_d 、i Ls_q ；
The current signal i is converted into a voltage signal Ls_d Subtracting the reference current I ref sin (ω · t), obtaining d-axis current difference, and dividing said dThe shaft current difference value is subjected to PI adjustment to obtain a d-shaft current adjustment quantity;
the current signal i Ls_q Subtracting 0 to obtain a q-axis current difference value, and adjusting the q-axis current difference value through PI to obtain a q-axis current adjustment quantity;
carrying out iPark coordinate transformation on the d-axis current regulating quantity and the q-axis current regulating quantity to obtain an alpha-axis current regulating quantity i * Ls_alpha 。
Preferably, the preset coefficient threshold is 1/V dc (ii) a Wherein, V dc The dc side voltage of the multi-phase rectification/inversion topology.
In order to solve the above technical problem, the present invention further provides a single-phase control system based on a multiphase rectification/inversion topology, comprising:
a signal acquisition module for acquiring the AC side voltage u corresponding to the target in the multi-phase rectification/inversion topology s And an alternating side current i Ls And using a quadrature signal generator to obtain the voltage u on the AC side s Corresponding two orthogonal signals u s_alpha 、u s_beta And the alternating side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta (ii) a Wherein the target phase is any phase;
a PLL operation module for converting the two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s Phase information ω · t of (a);
a PI control module for constructing a reference current based on the phase information omega.t and converting the reference current and the two orthogonal signals i Ls_alpha 、i Ls_beta The current regulating quantity i is obtained by operation of a PI control loop * Ls_alpha ；
A switch driving module for adjusting the current i * Ls_alpha With said quadrature signal u s_alpha Adding the obtained signals, multiplying the added signals by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling a power switch device corresponding to the target based on the modulation parameter to realize the multi-phase adjustmentEach phase of the current/inversion topology is controlled independently.
In order to solve the above technical problem, the present invention further provides a single-phase control device based on a multiphase rectification/inversion topology, comprising:
a memory for storing a computer program;
a processor for implementing the steps of any of the above single-phase control methods based on a multiphase rectification/inversion topology when executing the computer program.
In order to solve the above technical problem, the present invention further provides a multiphase rectification/inversion topology, including a plurality of single-phase control devices based on the multiphase rectification/inversion topology; and each single-phase control device corresponds to each phase of the multiphase rectification/inversion topology one by one.
The invention provides a single-phase control method based on a multiphase rectification/inversion topology, which is characterized by acquiring alternating-current side voltage and alternating-current side current corresponding to a target in the multiphase rectification/inversion topology, and solving two voltage orthogonal signals corresponding to the alternating-current side voltage and two current orthogonal signals corresponding to the alternating-current side current by using an orthogonal signal generator; performing PLL operation on the two voltage orthogonal signals to obtain phase information of the alternating-current side voltage; constructing a reference current based on the phase information, and calculating the reference current and two current orthogonal signals through a PI control loop to obtain an alpha-axis current regulating quantity; and adding the alpha-axis current regulating quantity and the alpha-axis voltage orthogonal signal, multiplying the obtained product by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling the power switching device corresponding to the target based on the modulation parameter. Therefore, the method can realize the independent control of each phase of the multi-phase rectification/inversion topology, namely the control of each phase is independent, when any one phase is in phase loss or phase dislocation, the control of the rest phases cannot be influenced, and the rest phases can still work normally, thereby being beneficial to the development and application of the multi-phase rectification/inversion topology; moreover, no matter the system is in a positive sequence, a negative sequence, a zero sequence or other three-phase forms, the rectification/inversion control can be realized, and the flexibility of the system is ensured to the maximum extent.
The invention also provides a single-phase control system and device based on the multiphase rectification/inversion topology and the multiphase rectification/inversion topology, and the single-phase control method has the same beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a single-phase control method based on a multiphase rectification/inversion topology according to an embodiment of the present invention;
fig. 2 is a single-phase control schematic diagram based on a multiphase rectification/inversion topology according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a quadrature signal generator according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a PLL loop according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a multiphase rectification/inversion topology and a single-phase control method, a system and a device thereof, which can realize the independent control of each phase of the multiphase rectification/inversion topology, namely the control of each phase is independent, when any phase is in phase failure or phase error, the control of the rest phases is not influenced, and the rest phases can still work normally, thus being beneficial to the development and application of the multiphase rectification/inversion topology; moreover, no matter the system is in a positive sequence, a negative sequence, a zero sequence or other three-phase forms, the rectification/inversion control can be realized, and the flexibility of the system is ensured to the maximum extent.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a flowchart of a single-phase control method based on a multiphase rectification/inversion topology according to an embodiment of the present invention.
The single-phase control method based on the multiphase rectification/inversion topology comprises the following steps:
step S1: obtaining alternating-current side voltage u corresponding to target in multiphase rectification/inversion topology s And an alternating side current i Ls And using a quadrature signal generator to obtain the voltage u on the AC side s Corresponding two orthogonal signals u s_alpha 、u s_beta And an alternating side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta 。
Step S2: two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain AC side voltage u s The phase information ω · t of (c).
And step S3: constructing a reference current based on the phase information omega.t, and combining the reference current and two orthogonal signals i Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha 。
And step S4: regulating the current by an amount i * Ls_alpha With quadrature signal u s_alpha And multiplying the sum by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling a power switch device corresponding to a target based on the modulation parameter so as to realize independent control of each phase of the multiphase rectification/inversion topology.
It should be noted that, the target phase in the present application refers to any phase in a multiphase rectification/inversion topology, such as phase a, phase B or phase C in a three-phase rectification/inversion topology.
Specifically, as shown in fig. 2, a single-phase control principle of a three-phase rectification/inversion topology is described by taking an a phase as an example:
1) Obtaining the corresponding AC side voltage u of A in the three-phase rectification/inversion topology a And using a quadrature signal generator to obtain the voltage u on the AC side a Corresponding two orthogonal signals u a_alpha 、u a_beta (ii) a Wherein the orthogonal signal u a_alpha With a voltage u on the AC side a Are in phase, quadrature signals u a_alpha With quadrature signal u a_beta Are 90 degrees out of phase, quadrature signal u a_alpha As alpha-axis voltage signal, quadrature signal u a_beta As a beta axis voltage signal. Meanwhile, alternating current side current i corresponding to A in the multi-phase rectification/inversion topology is obtained La And using a quadrature signal generator to obtain an AC side current i La Corresponding two orthogonal signals i La_alpha 、i La_beta (ii) a Wherein the orthogonal signal i La_alpha With alternating side current i La Are in the same phase, quadrature signals i La_alpha And quadrature signal i La_beta Is 90 degrees out of phase, quadrature signal i La_alpha As alpha-axis current signal, quadrature signal i La_beta As a beta axis current signal. It can be seen that the voltage current signal in the α β coordinate system is constructed based on the ac side voltage current corresponding to a single phase, and has no relation with the remaining phase voltage current.
2) The constructed alpha-axis voltage signal u a_alpha And a beta axis voltage signal u a_beta Performing PLL (Phase Locked Loop) operation to obtain a voltage u at the A Phase crossing current side a Phase information ω · t.
3) Based on A cross current side voltage u a The phase information omega.t of the reference current signal is used to construct a reference current, and the reference current and the constructed current signal i are used to construct a reference current signal La_alpha 、i La_beta Calculating by a PI control loop to obtain an alpha axis current regulating quantity i * La_alpha And beta axis current adjustment i * La_beta (beta axis Current adjustment amount i * La_beta Discarded).
4) Adjusting alpha axis current by i * La_alpha And alpha axis voltage signal u a_alpha And adding, multiplying the addition result by a preset coefficient threshold to obtain a modulation parameter, and adjusting a Pulse Width Modulation (PWM) driving signal for controlling a power switch device corresponding to the phase A based on the modulation parameter so as to realize the phase A independent control of the multiphase rectification/inversion topology.
It should be noted that the control principle of the B and C phases in the three-phase rectification/inversion topology is the same as that of the a phase (s = B for the B phase and s = C for the C phase), and the two phases may be referred to each other, which is not described herein again.
Therefore, the method can realize the independent control of each phase of the multi-phase rectification/inversion topology, namely the control of each phase is independent, when any one phase is in phase loss or phase dislocation, the control of the rest phases cannot be influenced, and the rest phases can still work normally, thereby being beneficial to the development and application of the multi-phase rectification/inversion topology; moreover, no matter the system is in a positive sequence, a negative sequence, a zero sequence or other three-phase forms, the rectification/inversion control can be realized, and the flexibility of the system is ensured to the maximum extent.
On the basis of the above-described embodiment:
as an alternative embodiment, the quadrature signal generator is a frequency-adaptive quadrature signal generator built directly in the z-domain.
Specifically, the quadrature signal generator of the present application is built directly in the z-domain, and the quadrature signal generator can implement frequency adaptation.
As an alternative embodiment, the transfer function of the quadrature signal generator is:
wherein x (z) is an input signal of the quadrature signal generator; y is α (z) and y β (z) two orthogonal signals output by the orthogonal signal generator; omega 0 Is the angular frequency of the input signal; t is a unit of s Is the sampling frequency; cos (omega) 0 T s )、sin(ω 0 T s ) Adaptive parameters for the quadrature signal generator; and xi is a preset constant.
Specifically, the present application relates to angular frequency ω 0 Determining independent variables of the orthogonal signal generator based on the angular frequency omega 0 Establishing an adaptive parameter cos (omega) of a quadrature signal generator 0 T s ) And sin (ω) 0 T s )(T s As sampling frequency) and then based on adaptive parametersNumber cos (ω) 0 T s ) And sin (ω) 0 T s ) And a quadrature signal generator for acquiring two orthogonal signals corresponding to the input signal is directly established in a z-domain.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a quadrature signal generator according to an embodiment of the present invention. Wherein x (z) is an input signal of the quadrature signal generator; y is α (z) and y β (z) two orthogonal signals output by the orthogonal signal generator; t is α (z) and T β (z) is the intermediate signal of the quadrature signal generator.
After a lot of experiments, the present application establishes the orthogonal signal generator directly established in the z-domain as the structure shown in fig. 3, and deduces the structure shown in fig. 3 to obtain the transfer function of the orthogonal signal generator as:
as an alternative embodiment, the voltage u on the AC side is obtained s After the phase information ω · t, the single-phase control method based on the multiphase rectification/inversion topology further includes:
and adjusting the current angular frequency corresponding to the orthogonal signal generator according to the angular frequency omega corresponding to the phase information omega t so as to enable the orthogonal signal generator to realize frequency self-adaptation.
Further, the method obtains the voltage u on the side of the target cross current s After the phase information omega.t, according to the target cross current side voltage u s The current angular frequency of the orthogonal signal generator corresponding to the target is adjusted, that is, the current angular frequency of the orthogonal signal generator corresponding to the target is modified into the angular frequency omega, so that the orthogonal signal generator realizes frequency self-adaptation.
Referring to fig. 4, fig. 4 is a schematic diagram of a PLL loop according to an embodiment of the present invention.
As an alternative embodiment, two orthogonal signals u are used s_alpha 、u s_beta Performing PLL operation to obtain AC side voltage u s Phase ofProcess of information ω · t, comprising:
two orthogonal signals u s_alpha 、u s_beta Obtaining two voltage signals u under dq coordinate system through Park coordinate transformation s_q 、u s_d ；
Will voltage signal u s_d Is discarded, and 0 is subtracted by the voltage signal u s_q Obtaining a voltage difference value epsilon, and regulating the voltage difference value epsilon through PI to obtain an angular frequency regulating quantity;
adjusting the angular frequency to a predetermined angular frequency omega 1 Adding to obtain AC side voltage u s And integrating the angular frequency omega to obtain the alternating-current side voltage u s Phase information ω · t of (d);
adjusting two orthogonal signals u based on phase information ω · t s_alpha 、u s_beta Phase values used in the Park coordinate transformation.
Specifically, the operation process of the PLL loop is:
1) The constructed alpha-axis voltage signal u s_alpha And beta axis voltage signal u s_beta Two voltage signals u under dq coordinate system are obtained through Park coordinate transformation s_q 、u s_d 。
2) D-axis voltage signal u s_d Is discarded, and the q-axis voltage signal u is subtracted from 0 s_q And obtaining a voltage difference value epsilon, and regulating the voltage difference value epsilon through PI to obtain an angular frequency regulating quantity.
3) Adjusting the angular frequency to a predetermined angular frequency omega 1 Adding to obtain AC side voltage u s And an angular frequency ω of the alternating-current side voltage u, and s is integrated to obtain an AC side voltage u s Phase information ω · t.
4) Based on the voltage u at the AC side s Adjusting the alpha-axis voltage signal u by the phase information ω · t of s_alpha And a beta axis voltage signal u s_beta A phase value used in the Park coordinate transformation, namely, the phase value used in the Park coordinate transformation is modified into the alternating-current side voltage u obtained in the step 3) s Phase information ω · t.
As an alternative embodiment, based on phase informationForming a reference current by omega.t, and combining the reference current and two orthogonal signals i Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha The process of (2), comprising:
reference current I is constructed based on phase information omega.t ref sin (ω · t) and, based on the phase information ω · t, dividing the two orthogonal signals i Ls_alpha 、i Ls_beta Carrying out Park coordinate transformation to obtain two current signals i under dq coordinate system Ls_d 、i Ls_q ；
Will current signal i Ls_d Minus a reference current I ref sin (omega. T) to obtain a d-axis current difference value, and adjusting the d-axis current difference value by PI to obtain a d-axis current adjustment quantity;
will current signal i Ls_q Subtracting 0 to obtain a q-axis current difference value, and adjusting the q-axis current difference value through PI to obtain a q-axis current adjustment quantity;
carrying out iPark coordinate transformation on the d-axis current regulating quantity and the q-axis current regulating quantity to obtain an alpha-axis current regulating quantity i * Ls_alpha 。
Specifically, as shown in fig. 2, the control principle of the PI control loop will be described with phase a as an example:
1) Based on A cross current side voltage u a The phase information ω · t of (d), the reference current I is constructed ref sin (ω · t) and based on the A-phase cross-current side voltage u a The phase information ω · t of the alpha-axis current signal i La_alpha And beta axis current signal i La_beta Performing Park coordinate transformation (namely, the phase value used by the Park coordinate transformation is the voltage u on the A cross current side a To obtain two current signals i) in the dq coordinate system La_d 、i La_q 。
2) The d-axis current signal i La_d Minus a reference current I ref sin (omega. T) to obtain a d-axis current difference value, and adjusting the d-axis current difference value by PI to obtain a d-axis current adjustment quantity. At the same time, the q-axis current signal i La_q And subtracting 0 to obtain a q-axis current difference value, and regulating the q-axis current difference value by PI to obtain a q-axis current regulating quantity.
3) Carrying out iPark coordinate transformation on the d-axis current regulating quantity and the q-axis current regulating quantity to obtain an alpha-axis current regulating quantity i * La_alpha And beta axis current adjustment i * La_beta (beta axis Current adjustment amount i * La_beta Discarded).
It should be noted that the control principle of the PI control loop of the B-phase and the C-phase is the same as that of the a-phase (s = B for the B-phase and s = C for the C-phase), and the two phases may be referred to each other, and the details are not repeated herein.
As an alternative embodiment, the preset coefficient threshold is 1/V dc (ii) a Wherein, V dc Is the dc side voltage of the multiphase rectifying/inverting topology.
Specifically, the preset coefficient threshold value of the application is 1/V dc As shown in FIG. 2, V dc Is the dc side voltage of the multiphase rectifying/inverting topology.
The present application further provides a single-phase control system based on a multiphase rectification/inversion topology, comprising:
a signal acquisition module for acquiring the AC side voltage u corresponding to the target in the multi-phase rectification/inversion topology s And an alternating side current i Ls And using a quadrature signal generator to obtain the voltage u on the AC side s Corresponding two orthogonal signals u s_alpha 、u s_beta And alternating side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta (ii) a Wherein the target phase is any phase;
PLL operation module for converting two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain AC side voltage u s Phase information ω · t of (d);
a PI control module for constructing reference current based on the phase information omega.t and converting the reference current and two orthogonal signals i Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha ；
A switch driving module for adjusting the current by an amount i * Ls_alpha With quadrature signal u s_alpha Adding the obtained products and multiplying the obtained products by a preset coefficient threshold value to obtainAnd modulating parameters, and adjusting the driving signals of the power switching devices corresponding to the control targets based on the modulation parameters so as to realize independent control of each phase of the multiphase rectification/inversion topology.
For introduction of the single-phase control system provided in the present application, please refer to the above-mentioned embodiment of the single-phase control method, which is not described herein again.
The application also provides a single-phase control device based on heterogeneous rectification/contravariant topology, includes:
a memory for storing a computer program;
and a processor for implementing the steps of any one of the above single-phase control methods based on the multiphase rectification/inversion topology when executing the computer program.
For introduction of the single-phase control apparatus provided in the present application, please refer to the above-mentioned embodiment of the single-phase control method, which is not described herein again.
The application also provides a multiphase rectification/inversion topology, which comprises a plurality of single-phase control devices based on the multiphase rectification/inversion topology; wherein, each single-phase control device corresponds to each phase of the multiphase rectification/inversion topology.
For introduction of the multiphase rectification/inversion topology provided in the present application, reference is made to the above-mentioned embodiment of the single-phase control device, and details of the multiphase rectification/inversion topology are not repeated herein.
It should also be noted that, in this specification, relational terms such as first and second, and the like are 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 phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A single-phase control method based on a multiphase rectification/inversion topology is characterized by comprising the following steps:
obtaining alternating-current side voltage u corresponding to target in multiphase rectification/inversion topology s And an alternating side current i Ls And the voltage u on the AC side is obtained by using a quadrature signal generator s Corresponding two orthogonal signals u s_alpha 、u s_beta And the alternating side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta (ii) a Wherein the target phase is any phase;
the two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s Phase information ω · t of (d);
constructing a reference current based on the phase information ω · t, and combining the reference current and the two orthogonal signals i Ls_alpha 、i Ls_beta The current regulating quantity i is obtained by operation of a PI control loop * Ls_alpha ；
Adjusting the current by an amount i * Ls_alpha With said quadrature signal u s_alpha And multiplying the added values by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling the power switch device corresponding to the target based on the modulation parameter so as to realize independent control of each phase of the multiphase rectification/inversion topology.
2. The single-phase control method based on the multiphase rectification/inversion topology as claimed in claim 1, wherein the quadrature signal generator is a frequency-adaptive quadrature signal generator directly built in z-domain.
3. The single-phase control method based on the multiphase rectification/inversion topology as claimed in claim 2, wherein the transfer function of the quadrature signal generator is:
wherein x (z) is an input signal of the quadrature signal generator; y is α (z) and y β (z) two orthogonal signals output by the orthogonal signal generator; omega 0 Is the angular frequency of the input signal; t is a unit of s Is the sampling frequency; cos (omega) 0 T s )、sin(ω 0 T s ) Adaptive parameters for the quadrature signal generator; and xi is a preset constant.
4. The single-phase control method based on the multiphase rectification/inversion topology as claimed in claim 3, wherein the AC side voltage u is obtained s After the phase information ω · t, the single-phase control method based on the multiphase rectification/inversion topology further includes:
and adjusting the current angular frequency corresponding to the orthogonal signal generator according to the angular frequency omega corresponding to the phase information omega.t, so that the orthogonal signal generator realizes frequency self-adaptation.
5. The single-phase control method based on multiphase rectification/inversion topology as claimed in claim 1, characterized in that the two quadrature signals u are applied s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s The process of phase information ω · t of (a), comprising:
the two orthogonal signals u s_alpha 、u s_beta Obtaining two voltage signals u under dq coordinate system through Park coordinate transformation s_q 、u s_d ；
The voltage signal u is converted into a voltage signal s_d Is discarded and 0 is subtracted from the voltage signal u s_q Obtaining a voltage difference value epsilon, and regulating the voltage difference value epsilon through PI to obtain an angular frequency regulating quantity;
adjusting the angular frequency to a preset angular frequency omega 1 Adding to obtain the AC side voltage u s And integrating the angular frequency omega to obtain the alternating-current side voltage u s Phase information ω · t of (d);
adjusting the two orthogonal signals u based on the phase information ω · t s_alpha 、u s_beta Phase values used in the Park coordinate transformation.
6. Single-phase control method based on a multiphase rectifier/inverter topology according to any of claims 1 to 5, characterized in that a reference current is constructed based on said phase information ω -t and said reference current and said two quadrature signals i are combined Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha The process of (2), comprising:
constructing a reference current I based on the phase information ω · t ref sin (ω · t) and, based on the phase information ω · t, dividing the two orthogonal signals i Ls_alpha 、i Ls_beta Carrying out Park coordinate transformation to obtain two current signals i under dq coordinate system Ls_d 、i Ls_q ；
The current signal i Ls_d Subtracting the reference current I ref sin (omega. T) to obtain a d-axis current difference value, and adjusting the d-axis current difference value by PI to obtain a d-axis current adjustment quantity;
the current signal i Ls_q Subtracting 0 to obtain a q-axis current difference value, and performing PI regulation on the q-axis current difference value to obtain a q-axis current regulating quantity;
carrying out iPark coordinate transformation on the d-axis current regulating quantity and the q-axis current regulating quantity to obtain an alpha axisCurrent regulation i * Ls_alpha 。
7. The multiphase rectification/inversion topology based single-phase control method according to claim 6, wherein the preset coefficient threshold is 1/V dc (ii) a Wherein, V dc The dc side voltage of the multi-phase rectification/inversion topology.
8. A single phase control system based on a multiphase rectification/inversion topology, comprising:
a signal acquisition module for acquiring AC side voltage u corresponding to a target in a multi-phase rectification/inversion topology s And an alternating side current i Ls And the voltage u on the AC side is obtained by using a quadrature signal generator s Corresponding two orthogonal signals u s_alpha 、u s_beta And the alternating side current i Ls Corresponding two orthogonal signals i Ls_alpha 、i Ls_beta (ii) a Wherein the target phase is any phase;
a PLL operation module for converting the two orthogonal signals u s_alpha 、u s_beta Performing PLL operation to obtain the AC side voltage u s Phase information ω · t of (a);
a PI control module for constructing a reference current based on the phase information omega.t and converting the reference current and the two orthogonal signals i Ls_alpha 、i Ls_beta Calculating by a PI control loop to obtain a current regulating quantity i * Ls_alpha ；
A switch drive module for adjusting the current i * Ls_alpha With said quadrature signal u s_alpha And multiplying the sum by a preset coefficient threshold value to obtain a modulation parameter, and adjusting a driving signal for controlling the power switch device corresponding to the target based on the modulation parameter so as to realize independent control of each phase of the multiphase rectification/inversion topology.
9. A single-phase control apparatus based on a multiphase rectifier/inverter topology, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for single-phase control based on a multiphase rectifier/inverter topology according to any of claims 1 to 7 when executing said computer program.
10. A multiphase rectifying/inverting topology comprising a plurality of single phase control devices according to claim 9 based on the multiphase rectifying/inverting topology; and each single-phase control device corresponds to each phase of the multiphase rectification/inversion topology one by one.
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