阅读说明：本技术 一种多相整流/逆变拓扑及其单相控制方法、系统和装置 (Multiphase rectification/inversion topology and single-phase control method, system and device thereof ) 是由 易龙强 陈四雄 苏先进 黄文俊 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种多相整流/逆变拓扑及其单相控制方法、系统和装置,获取多相整流/逆变拓扑中目标相对应的交流侧电压和交流侧电流,并利用正交信号发生器求取交流侧电压对应的两电压正交信号及交流侧电流对应的两电流正交信号；将两电压正交信号进行PLL运算,得到交流侧电压的相位信息；基于相位信息构造参考电流,并将参考电流及两电流正交信号经PI控制环路进行运算,得到α轴电流调节量；将α轴电流调节量与α轴电压正交信号相加后乘以一个预设系数阈值,得到调制参数,并基于调制参数调整用于控制目标相对应的功率开关器件的驱动信号。可见,本申请可实现多相整流/逆变拓扑的各相单独控制,有利于多相整流/逆变拓扑的发展应用。(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 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 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.)

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_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And the alternating side current i_LsCorresponding 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_sPhase 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 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.

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; omega₀Is the angular frequency of the input signal; t is_sIs the sampling frequency; cos (omega)₀T_s)、sin(ω₀T_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 single-phase control method is characterized in thatObtaining the voltage u on the AC side_sAfter 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_sThe 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 omega₁Adding to obtain the AC side voltage u_sAnd integrating the angular frequency omega to obtain the alternating-current side voltage u_sPhase 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 rectification/inversion topology according to any of claims 1 to 5, characterized in that a reference current is constructed based on the phase information ω · t and the reference current and the two quadrature 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:

based on the phase information ω · tConstructing a reference current I_refsin (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_{Ls_d}Subtracting the reference current I_refsin (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-axis current regulating quantity i^* _{Ls_alpha}。

7. The multiphase rectification/inversion topology based single phase control method of claim 6, wherein the preset coefficient threshold is 1/V_dc(ii) a Wherein, V_dcThe 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 the AC side voltage u corresponding to the target in the multi-phase rectification/inversion topology_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And the alternating side current i_LsCorresponding 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_sPhase information ω · t of (d);

a PI control module for basing the phaseConstructing a reference current by information omega.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}；

A switch driving 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 rectification/inversion topology, comprising:

a memory for storing a computer program;

a processor for implementing the steps of the single-phase control method based on a multiphase rectification/inversion topology according to any of claims 1-7 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.

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 quantity 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 quantity 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 quantity, thereby realizing the variable flow control of three-phase rectification/inversion.

However, in the whole control process, the three-phase ac side component is considered as a whole space vector, that is, if any one of the cross-current side components is absent or any one of the cross-current side components is defective, the control cannot be successfully completed, so that the system cannot normally operate when the system has a phase error, a phase loss and three-way access single phase. At present, several conditions which cause the system to work normally can be identified, timely warning and system halt control are carried out, 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 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 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_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And the alternating side current i_LsCorresponding 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_sPhase 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 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.

Preferably, the orthogonal signal generator is a frequency-adaptive orthogonal signal generator directly built 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 the orthogonal signal generator; omega₀Is the angular frequency of the input signal; t is_sIs the sampling frequency; cos (omega)₀T_s)、sin(ω₀T_s) Adaptive parameters for the quadrature signal generator; and xi is a preset constant.

Preferably, the voltage u on the alternating side is obtained_sAfter 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_sThe 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 omega₁Adding to obtain the AC side voltage u_sAnd integrating the angular frequency omega to obtain the alternating-current side voltage u_sPhase information ω · t of (d);

adjusting the two orthogonal signals u based on the phase information ω · t_{s_alpha}、u_{s_beta}Phase value used in 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}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_refsin (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_{Ls_d}Subtracting the reference current I_refsin (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-axis current regulating quantity i^* _{Ls_alpha}。

Preferably, the preset coefficient threshold is 1/V_dc(ii) a Wherein, V_dcThe 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_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And the alternating side current i_LsCorresponding two orthogonal signals i_{Ls_alpha}、i_{Ls_beta}(ii) a Wherein the target phase is any phase;

a PLL operation module for calculatingThe two orthogonal signals u_{s_alpha}、u_{s_beta}Performing PLL operation to obtain the AC side voltage u_sPhase information ω · t of (d);

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 driving 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.

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 technical problem, the invention also provides a multiphase rectification/inversion topology, which comprises 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 multi-phase 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_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And alternating side current i_LsCorresponding 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_sPhase information ω · t.

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}。

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 multi-phase rectification/inversion topology, such as A, B, C three-phase rectification/inversion topology, i.e., a phase, B phase, or C phase.

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_aAnd using a quadrature signal generator to obtain the voltage u on the AC side_aCorresponding 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_aAre in the same 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, obtaining the alternating current i corresponding to A in the multi-phase rectification/inversion topology_LaAnd using a quadrature signal generator to obtain an AC side current i_LaCorresponding two orthogonal signals i_{La_alpha}、i_{La_beta}(ii) a Wherein the orthogonal signal i_{La_alpha}With alternating side current i_LaAre in the same phase, quadrature signals i_{La_alpha}With 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 voltage-current of the ac side corresponding to the single phase, and has no relation with the voltage-current of the other phases.

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 cross current side voltage u_aPhase information ω · t.

3) Based on A cross flow sideVoltage u_aThe 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 the alpha axis current by an amount 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 PWM (Pulse width modulation) driving signal for controlling a corresponding power switch device A based on the modulation parameter so as to realize the independent control of the phase A of the multiphase rectification/inversion topology.

It should be noted that the control principle of the B, C phases in the three-phase rectification/inversion topology is the same as that of the a phase (s is taken as B for the B phase, and s is taken as C for the C phase), and the two phases may be referred to each other, and the description thereof is omitted here.

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; omega₀Is the angular frequency of the input signal; t is_sIs the sampling frequency; cos (omega)₀T_s)、sin(ω₀T_s) Adaptive parameters for the quadrature signal generator; and xi is a preset constant.

Specifically, the present application relates to angular frequency ω₀Determining independent variables of the orthogonal signal generator based on the angular frequency omega₀Establishing an adaptive parameter cos (omega) of a quadrature signal generator₀T_s) And sin (ω)₀T_s)(T_sFor the sampling frequency) and then based on the adaptive parameter cos (ω)₀T_s) And sin (ω)₀T_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_sAfter 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_sAfter the phase information ω · t, according to the target cross-current side voltage u_sThe angular frequency omega corresponding to the phase information omega.t, the current angular frequency of the orthogonal signal generator corresponding to the target is adjusted, namely the current angular frequency corresponding to 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_sThe process of phase information ω · t of (a), 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 omega₁Adding to obtain an AC side voltage u_sAnd integrating the angular frequency omega to obtain the alternating-current side voltage u_sPhase 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 a beta axis voltage signal u_{s_beta}Obtaining two voltage signals u under dq coordinate system through Park coordinate transformation_{s_q}、u_{s_d}。

2) Converting the d-axis voltage signal u_{s_d}Is discarded, and the q-axis voltage signal u is subtracted from 0_{s_q}To obtainAnd adjusting the voltage difference value epsilon through PI to obtain the angular frequency adjustment quantity.

3) Adjusting the angular frequency to a predetermined angular frequency omega₁Adding to obtain an AC side voltage u_sAnd an angular frequency ω of the alternating-current side voltage u, and_sis integrated to obtain an AC side voltage u_sPhase information ω · t.

4) Based on the voltage u at the AC side_sAdjusting 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)_sPhase information ω · t.

As an alternative embodiment, a reference current is constructed based on the phase information ω · t, and the reference current and 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:

reference current I is constructed based on phase information omega.t_refsin (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_refsin (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 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-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_aPhase information ofOmega. t, a reference current I is constructed_refsin (ω · t) and based on the A-phase current-side voltage u_aThe 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 A cross current side voltage u_aTo obtain two current signals i) in dq coordinate system_{La_d}、i_{La_q}。

2) The d-axis current signal i_{La_d}Minus a reference current I_refsin (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 performing PI regulation on the q-axis current difference value 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).

The control principle of the B, C-phase PI control loop is the same as that of the a-phase (s is taken as B, and s is taken as C for C), and the two phases may be referred to each other, and the description thereof is omitted.

As an alternative embodiment, the preset coefficient threshold is 1/V_dc(ii) a Wherein, V_dcIs the dc side voltage of the multiphase rectifying/inverting topology.

Specifically, the preset coefficient threshold value of the application is 1/V_dcAs shown in FIG. 2, V_dcIs the dc side voltage of the multiphase rectifying/inverting topology.

The application also provides a single-phase control system based on heterogeneous rectification/contravariant topology, includes:

a signal acquisition module for acquiring the AC side voltage u corresponding to the target in the multi-phase rectification/inversion topology_sAnd an alternating side current i_LsAnd using a quadrature signal generator to obtain the voltage u on the AC side_sCorresponding two orthogonal signals u_{s_alpha}、u_{s_beta}And the AC sideCurrent i_LsCorresponding 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_sPhase information ω · t of (d);

a PI control module for constructing a 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}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.

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 embodiments of the single-phase control method, which are 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 the 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 present application are not repeated herein.

It is further noted that, in the present 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 phrase "comprising an … …" does not exclude the presence of other identical 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.