CN112152609A - Phase-locked loop, method for controlling synchronization of grid voltage information and power electronic device - Google Patents

Phase-locked loop, method for controlling synchronization of grid voltage information and power electronic device Download PDF

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CN112152609A
CN112152609A CN202010855667.5A CN202010855667A CN112152609A CN 112152609 A CN112152609 A CN 112152609A CN 202010855667 A CN202010855667 A CN 202010855667A CN 112152609 A CN112152609 A CN 112152609A
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phase
grid voltage
signal
power grid
locked loop
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CN112152609B (en
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陈欣
文宇良
李程
彭赟
胡景瑜
付刚
王跃
吴奕
黄超
孙璐
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CRRC Zhuzhou Institute Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/097—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using a comparator for comparing the voltages obtained from two frequency to voltage converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop

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Abstract

The invention discloses a phase-locked loop, a method for controlling synchronization of power grid voltage information and a power electronic device, wherein the phase-locked loop comprises a comparator, a loop filter, a voltage-controlled oscillator, an amplitude tracker and a parameter self-adaptive controller; the comparator obtains an error signal according to the power grid voltage signal and an output signal fed back by the amplitude tracker; the parameter self-adaptive controller generates a gain parameter of the current period of the loop filter according to a parameter reflecting phase change, the gain parameter of the loop filter in the current period obtains the frequency increment of the power grid voltage, the voltage-controlled oscillator obtains the phase of the power grid voltage, the amplitude tracker adjusts the output signal, so that the phase locking of the output signal and the power grid voltage signal is realized, the gain parameter of the loop filter is changed along with the phase change of the power grid voltage, the frequency transient disturbance can be restrained when the phase jumps, the adaptability of the phase-locked loop to the abnormal power grid environment is improved, and the phase-locked loop is ensured to rapidly and accurately obtain the good dynamic performance of the power grid voltage information.

Description

Phase-locked loop, method for controlling synchronization of grid voltage information and power electronic device
Technical Field
The invention belongs to the technical field of electric energy change, and particularly relates to a phase-locked loop, a method for controlling synchronization of power grid voltage information and a power electronic device.
Background
The method for rapidly and accurately acquiring the power grid voltage information such as the phase, the frequency, the amplitude and the like of the power grid voltage is a premise for safe and stable operation of a power electronic device under the severe power grid environment condition, is a basic requirement for realizing the control of a high-performance converter, and plays a vital role in a high-performance phase-locked loop technology.
The load of a power supply system of facilities such as a railway has the characteristics of high power, random volatility, nonlinearity and the like, and under the working conditions such as pantograph-catenary disconnection and the like, the phenomena of abnormal grid voltage such as phase jump of grid voltage, voltage amplitude drop, harmonic pollution and the like can occur. In an enhanced phase-locked loop, the gain coefficient of a loop filter directly controls the bandwidth of a phase frequency loop, and the fast response requires a wide bandwidth, i.e. a large value, but the frequency and phase coupling degree is higher; when the network voltage abnormity occurs, the phase-locked loop can reduce the phase-locking speed and precision due to frequency disturbance.
Therefore, how to improve the adaptability of the phase-locked loop to the abnormal power grid environment and ensure that the phase-locked loop can quickly and accurately acquire good dynamic performance of the power grid voltage information is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention mainly aims to provide a phase-locked loop, a method for controlling power grid voltage information synchronization and a power electronic device, so as to improve the adaptability of the phase-locked loop to abnormal power grid environments and ensure that the phase-locked loop can quickly and accurately acquire good dynamic performance of the power grid voltage information.
In view of the above problems, the present invention provides a phase-locked loop, which includes a comparator, a loop filter, a voltage-controlled oscillator, an amplitude tracker, and a parameter adaptive controller;
the input end of the comparator is connected with the output end of the amplitude tracker;
the output end of the comparator is respectively connected with the input end of the loop filter and the input end of the amplitude tracker;
the output end of the loop filter is connected with the input end of the voltage-controlled oscillator;
the output end of the voltage-controlled oscillator is respectively connected with the input end of the loop filter and the input end of the amplitude tracker;
the parameter self-adaptive controller is connected with the control end of the loop filter;
the comparator is used for carrying out phase discrimination on an input power grid voltage signal and an output signal fed back to the input end of the phase-locked loop by the amplitude tracker to obtain an input error signal and an output error signal of the phase-locked loop containing a phase error;
the parameter self-adaptive controller is used for generating a gain parameter of the current period of the loop filter according to the acquired parameter reflecting the phase change;
the loop filter is used for integrating the error signal and a first power grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator under the gain parameter of the current period to obtain a power grid voltage frequency variable of the current period;
the voltage-controlled oscillator is used for obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period according to the power grid voltage frequency variable and a preset frequency value;
and the amplitude tracker is used for adjusting the output signal according to the error signal and a second grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator so as to synchronize the output signal with the grid voltage signal.
Further, in the phase-locked loop, the parameter reflecting the phase change includes the error signal or a grid voltage frequency variable of a last period fed back by the loop filter.
Further, in the phase-locked loop, the parameter reflecting the phase change includes the error signal and a grid voltage frequency variable of a previous period fed back by the loop filter, and the parameter adaptive controller is specifically configured to:
and respectively substituting the phase signal error, the power grid voltage frequency variable and a preset standard gain coefficient into a preset calculation formula for calculation to obtain the gain parameter of the current period.
Further, in the above phase-locked loop, the calculation formula is:
Figure BDA0002644966620000021
wherein K' is the gain parameter of the current period, K is the standard gain coefficient, Δ ω is the grid voltage frequency variable of the previous period, e (t) is the error signal, λ1Is the weighted value of the grid voltage frequency variable of the previous period, lambda2Is the weight value of the error signal.
Further, in the above phase-locked loop, the λ1And said λ2Is 1And said λ1Less than said lambda2。
Further, in the phase-locked loop described above, the parameter adaptive controller is further configured to:
and if the current period is the first detection period, taking the standard gain coefficient as the gain parameter of the current period.
Further, in the above phase-locked loop, the voltage-controlled oscillator is specifically configured to:
adding the power grid voltage frequency variable and the preset frequency value to obtain a power grid voltage frequency value;
integrating the power grid voltage frequency value to obtain a power grid voltage angle value;
taking a cosine function of the grid voltage phase angle value as the first grid voltage phase angle signal, and taking a sine function of the grid voltage phase angle as the second grid voltage phase angle signal.
Further, in the above phase-locked loop, the amplitude tracker is specifically configured to:
multiplying the phase signal error by the second grid voltage phase angle signal to obtain a first product;
performing integral processing on the first product to obtain the amplitude of the voltage power grid in the current period;
and taking a second product of the voltage grid amplitude value and the second grid voltage phase angle signal as an output signal in the current period.
The invention also provides a method for controlling the synchronization of the voltage information of the power grid based on the phase-locked loop, which comprises the following steps:
comparing an input power grid voltage signal with an output signal fed back to the input end of the phase-locked loop by the amplitude tracker by using the comparator to obtain an error signal;
generating a gain parameter of the current period of the loop filter by using the parameter adaptive controller according to the acquired parameter reflecting the phase change;
integrating the error signal and a first grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator by using the loop filter under the gain parameter of the current period to obtain a grid voltage frequency variable of the current period;
obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period by using the voltage-controlled oscillator according to the power grid voltage frequency variable and a preset frequency value;
and adjusting the output signal by using the amplitude tracker according to the error signal and a second grid voltage phase angle signal of the previous period fed back by the voltage-controlled oscillator so as to synchronize the output signal with the grid voltage signal.
The invention also provides a power electronic device which is provided with the phase-locked loop.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by the phase-locked loop, the method for controlling the synchronization of the voltage information of the power grid and the power electronic device, the gain parameter of the current period of the loop filter is generated by setting the parameter adaptive controller and utilizing the parameter adaptive controller according to the acquired parameter reflecting the phase change, so that the gain parameter of the loop filter is changed along with the phase change of the voltage of the power grid, the instantaneous frequency disturbance can be restrained when the phase jumps, and the phase-locked loop can acquire the voltage information of the power grid quickly and accurately. By adopting the technical scheme of the invention, the adaptability of the phase-locked loop to abnormal power grid environment can be improved, and the phase-locked loop can be ensured to rapidly and accurately acquire good dynamic performance of power grid voltage information.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art phase locked loop;
FIG. 2 is a schematic diagram of an embodiment of a phase locked loop according to the present invention;
FIG. 3 is a schematic diagram of the temporal variation of frequency during a phase jump;
FIG. 4 is a schematic diagram of a network voltage distortion phase lock;
FIG. 5 is a schematic view of the tracking state of the net voltage amplitude;
fig. 6 is a flowchart of an embodiment of a method for controlling synchronization of grid voltage information according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to solve the above technical problems in the prior art, an embodiment of the present invention provides a phase-locked loop.
Fig. 1 is a schematic diagram of an embodiment of a prior art phase-locked loop, as shown in fig. 1, which includes a comparator 10, a loop filter 11, a voltage-controlled oscillator 12, and an amplitude tracker 13. In fig. 1, the first gain factor K2And a second gain factor K3Is a controlled phase frequency loop, wherein a first gain factor K2Is to directly control the bandwidth of the phase frequency loop; fast response requires a wide bandwidth, i.e. a first gain factor K2The values are large, but this will result in a higher degree of frequency and phase coupling. Therefore, when the power supply abnormal phenomenon occurs, the phase-locked loop can reduce the phase-locking speed and precision due to frequency disturbance. Therefore, the present invention provides the following technical solutions.
Fig. 2 is a schematic structural diagram of an embodiment of a phase-locked loop of the present invention, and as shown in fig. 2, the phase-locked loop of the present embodiment includes a comparator 10, a loop filter 11, a voltage-controlled oscillator 12, an amplitude tracker 13, and a parameter adaptive controller 14. Wherein, the input end of the comparator 10 is connected with the output end of the amplitude tracker 13; the output end of the comparator 10 is respectively connected with the input end of the loop filter 11 and the input end of the amplitude tracker 13; the output end of the loop filter 11 is connected with the input end of the voltage-controlled oscillator 12; the output end of the voltage-controlled oscillator 12 is connected with the input end of the loop filter 11 and the input end of the amplitude tracker 13 respectively; the parameter adaptive controller 14 is connected to the control terminal of the loop filter 11.
In one embodiment, the comparator 10 is capable of obtaining the output signal v fed back from the amplitude tracker 13 to the input of the phase-locked loop by the closed loop of the phase-locked loopoAnd a network voltage signal v input to the power supply systemiAnd the output signal v fed back to the input of the phase locked loop by the amplitude tracker 13oAnd comparing to obtain an error signal e (t) of the input and output of the phase-locked loop containing the phase error, and respectively sending the error signal e (t) to the loop filter 11 and the amplitude tracker 13.
The parameter adaptive controller 14 is configured to generate a gain parameter K' of the current cycle of the loop filter 11 according to the obtained parameter reflecting the phase change. Specifically, in this embodiment, the output terminal of the comparator 10 and the output terminal of the loop filter 11 are both connected to the parameter adaptive controller 14. Correspondingly, the parameters reflecting the phase change include the error signal e (t) and/or the grid voltage frequency variation Δ ω of the last period fed back by the loop filter 11. In this embodiment, the technical solution of the present invention is described by taking an example that parameters reflecting phase changes include an error signal e (t) and a grid voltage frequency variable Δ ω in a previous period. The parameter adaptive controller 14 is specifically configured to: and (e) (t) of the error signal, the grid voltage frequency variable delta omega of the previous period and the preset standard gain coefficient K are respectively substituted into a preset calculation formula for calculation to obtain the gain parameter K' of the current period. The calculation formula is preferably:
Figure BDA0002644966620000051
wherein, K' is the gain parameter of the current period, K is the standard gain coefficient, Δ ω is the grid voltage frequency variable of the previous period, e (t) is the error signal of the input and output of the phase-locked loop containing the phase error, λ1Is the weight value, lambda, of the grid voltage frequency variable of the previous cycle2Is the weight value of the error signal. In practical application, during phase jump, the error signal e (t) is directly reflected, and the grid voltage frequency variable Δ ω of the previous period is the output of the loop filter 11, and a process is required for PI adjustment to reflect the phase change, so that the error signal e (t) is more sensitive to the phase than the grid voltage frequency variable Δ ω of the previous period, and therefore λ is preferred in this embodiment1Less than said lambda2. In this embodiment, to accurately obtain the gain parameter of the current period, λ is preferred1And λ2The sum of (1).
In practical applications, if the parameter reflecting the phase change includes the error signal e (t) or the grid voltage frequency variable Δ ω of the previous cycle fed back by the loop filter 11, the data not included in the above calculation formula may be set to 0.
It should be noted that, in this embodiment, the parameter adaptive controller 14 is further configured to use the standard gain coefficient as the gain parameter of the current period if it is detected that the current period is the first detection period.
In this embodiment, after the parameter adaptive controller 14 generates the gain parameter of the current period of the loop filter 11, the loop filter 11 may integrate the error signal e (t) and the first grid voltage phase angle signal of the previous period fed back by the voltage-controlled oscillator 12 under the gain parameter of the current period to obtain the grid voltage frequency variable Δ ω of the current period, and send the obtained grid voltage frequency variable Δ ω of the current period to the voltage-controlled oscillator 12. Specifically, the error signal e (t) may be multiplied by the first grid voltage phase angle signal, and then integrated, so as to obtain the grid voltage frequency variable Δ ω of the current period.
The voltage-controlled oscillator 12 is used for varying the grid voltage frequency variable delta omega and the preset frequency value omega according to the current period0And obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period. Specifically, the voltage-controlled oscillator 12 adjusts the grid voltage frequency variable Δ ω and the preset frequency value ω for the current period0Summing to obtain the grid voltage phase angle value theta of the current period0And the grid voltage angular value theta of the current period is calculated0Multiplying the current period by a cosine function to obtain a first power grid voltage phase angle signal of the current period, and sending the signal to the loop filter 11; the grid voltage phase angle value theta of the current period is measured0And multiplying the current period by a sine function to obtain a second grid voltage phase angle signal of the current period, and sending the second grid voltage phase angle signal to the amplitude tracker 13.
The amplitude tracker 13 is configured to adjust the output signal according to the error signal e (t) and a periodic second grid voltage phase angle signal fed back by the voltage controlled oscillator 12, so that the output signal is synchronized with the grid voltage signal. Specifically, multiplying the phase signal error e (t) by the second grid voltage phase angle signal to obtain a first product; integral processing is carried out on the first product to obtain the voltage grid amplitude V in the current period0(ii) a Amplitude V of voltage network0The second product multiplied by the second grid voltage phase angle signal is used as the output signal in the current period. In the figure, K1The scale factor of the replica tracker.
According to the phase-locked loop of the embodiment, by setting the parameter adaptive controller 14 and generating the gain parameter of the current period of the loop filter 11 by using the parameter adaptive controller 14 according to the obtained parameter reflecting the phase change, the gain parameter of the loop filter 11 is changed along with the phase change of the power grid voltage, so that the instantaneous frequency disturbance can be suppressed when the phase jumps, and the phase-locked loop can rapidly and accurately obtain the power grid voltage information. By adopting the technical scheme of the invention, the adaptability of the phase-locked loop to abnormal power grid environment can be improved, and the phase-locked loop can be ensured to rapidly and accurately acquire good dynamic performance of power grid voltage information.
The technical scheme of the invention is realized and verified in Matlab, and the following related records can be specifically referred to:
fig. 3 is a schematic diagram of the instantaneous change of frequency when the phase suddenly changes, as shown in fig. 3, the phase suddenly changes (indicated by arrow 300) under the ideal network pressure condition; it can be seen that the enhanced pll (arrow 100) of the prior art requires a certain time to stabilize, while the parametrically adaptive enhanced pll (arrow 200) of the present invention has a faster response speed and less frequency fluctuation.
Fig. 4 is a schematic diagram of network voltage distortion phase locking, as shown in fig. 4, the actual network voltage information of the actual traction power supply network is relatively bad: the method is accompanied by a series of severe working conditions such as sudden change of phase and frequency, severe harmonic waves, voltage drop and the like, and the severe conditions are generally accompanied by phase fluctuation. As can be seen in fig. 4, the simulation introduces an actual net pressure (arrow 400 in the figure), which is a higher harmonic of the net pressure; when serious distortion occurs, the parameter adaptive enhanced phase-locked loop (arrow 200 in the figure) of the invention tracks the fundamental wave component of the network voltage signal more quickly than the traditional enhanced phase-locked loop (arrow 100 in the figure) and captures the frequency and the phase, therefore, the parameter adaptive enhanced phase-locked loop of the invention has stronger anti-jamming capability.
Fig. 5 is a schematic diagram illustrating a tracking state of the network voltage amplitude, and as shown in fig. 5, the parameter adaptive enhanced phase-locked loop (arrow 200) of the present invention can provide the network voltage amplitude or effective value. The common effective value calculation method is a filtering method (arrow 500 in the figure), but the method causes a certain delay and cannot reflect the real-time value of the network pressure (arrow 400 in the figure); the effective value of the network voltage captured by the parameter self-adaptive enhanced phase-locked loop can reflect the real situation of the network voltage in real time, and has good dynamic performance.
Fig. 6 is a flowchart of an embodiment of a method for controlling synchronization of grid voltage information according to the present invention, and the method for controlling synchronization of grid voltage information according to the present embodiment is applicable to the phase-locked loop according to the above embodiment. As shown in fig. 6, the method for controlling synchronization of grid voltage information in this embodiment may specifically include the following steps:
600. comparing an input power grid voltage signal with an output signal fed back to the input end of the phase-locked loop by the amplitude tracker by using a comparator to obtain an error signal containing the input and output of the phase-locked loop with a phase error;
601. generating a gain parameter of the current period of the loop filter by using a parameter adaptive controller according to the acquired parameter reflecting the phase change;
in one implementation, the parameter reflecting the phase change includes an error signal and/or a last cycle grid voltage frequency variable fed back by the loop filter.
In this embodiment, the technical solution of the present invention is described by taking parameters reflecting the phase change, including an error signal and a grid voltage frequency variable of a previous period fed back by a loop filter as an example.
Specifically, the signal error, the grid voltage frequency variable, and the preset standard gain coefficient may be respectively substituted into a preset calculation formula to perform calculation, so as to obtain the gain parameter of the current period.
The calculation formula is:
Figure BDA0002644966620000081
wherein K' is a gain parameter of the current period, K is a standard gain coefficient, delta omega is a grid voltage frequency variable of the previous period, e (t) is an error signal, and lambda1Is the weight value, lambda, of the grid voltage frequency variable of the previous cycle2Is the weight value of the error signal.
Preferably, λ1And λ2Is 1 and lambda1Less than λ2。
602. Integrating the error signal and a first power grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator by using a loop filter under the gain parameter of the current period to obtain a power grid voltage frequency variable of the current period;
603. obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period by using a voltage-controlled oscillator according to a power grid voltage frequency variable and a preset frequency value;
specifically, a power grid voltage frequency value is obtained after a power grid voltage frequency variable and a preset frequency value are added;
integrating the power grid voltage frequency value to obtain a power grid voltage angle value;
the cosine function of the grid voltage phase angle value is taken as a first grid voltage phase angle signal, and the sine function of the grid voltage phase angle is taken as a second grid voltage phase angle signal.
604. And adjusting the output signal by using an amplitude tracker according to the error signal and a second grid voltage phase angle signal of the previous period fed back by the voltage-controlled oscillator so as to synchronize the output signal with the grid voltage signal.
Specifically, multiplying the phase signal error by a second grid voltage phase angle signal to obtain a first product; performing integral processing on the first product to obtain the amplitude of the voltage power grid in the current period; and taking a second product of the voltage grid amplitude value and the second grid voltage phase angle signal as an output signal in the current period.
According to the method for controlling the synchronization of the power grid voltage information, the gain parameter of the current period of the loop filter is generated by the parameter self-adaptive controller according to the acquired parameter which internally reflects the phase change, so that the gain parameter of the loop filter changes along with the phase change of the power grid voltage, the instantaneous frequency disturbance can be restrained when the phase jumps, and the phase-locked loop can acquire the power grid voltage information quickly and accurately. By adopting the technical scheme of the invention, the adaptability of the phase-locked loop to abnormal power grid environment can be improved, and the phase-locked loop can be ensured to rapidly and accurately acquire good dynamic performance of power grid voltage information.
In order to solve the technical problems in the prior art, an embodiment of the present invention provides a power electronic device, which is provided with the phase-locked loop of the embodiment.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A phase-locked loop is characterized by comprising a comparator, a loop filter, a voltage-controlled oscillator, an amplitude tracker and a parameter self-adaptive controller;
the input end of the comparator is connected with the output end of the amplitude tracker;
the output end of the comparator is respectively connected with the input end of the loop filter and the input end of the amplitude tracker;
the output end of the loop filter is connected with the input end of the voltage-controlled oscillator;
the output end of the voltage-controlled oscillator is respectively connected with the input end of the loop filter and the input end of the amplitude tracker;
the parameter self-adaptive controller is connected with the control end of the loop filter;
the comparator is used for carrying out phase discrimination on an input power grid voltage signal and an output signal fed back to the input end of the phase-locked loop by the amplitude tracker to obtain an input error signal and an output error signal of the phase-locked loop containing a phase error;
the parameter self-adaptive controller is used for generating a gain parameter of the current period of the loop filter according to the acquired parameter reflecting the phase change;
the loop filter is used for integrating the error signal and a first power grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator under the gain parameter of the current period to obtain a power grid voltage frequency variable of the current period;
the voltage-controlled oscillator is used for obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period according to the power grid voltage frequency variable and a preset frequency value;
and the amplitude tracker is used for adjusting the output signal according to the error signal and a second grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator so as to synchronize the output signal with the grid voltage signal.
2. A phase locked loop as claimed in claim 1, wherein the parameter reflecting the phase change comprises the error signal or a last cycle grid voltage frequency variable fed back by the loop filter.
3. The phase-locked loop of claim 1, wherein the parameter reflecting the phase change comprises the error signal and a last cycle grid voltage frequency variable fed back by the loop filter, and wherein the parameter adaptive controller is specifically configured to:
and respectively substituting the phase signal error, the power grid voltage frequency variable and a preset standard gain coefficient into a preset calculation formula for calculation to obtain the gain parameter of the current period.
4. A phase locked loop according to claim 3, wherein the calculation is:
Figure FDA0002644966610000021
wherein K' is the gain parameter of the current period, K is the standard gain coefficient, Δ ω is the grid voltage frequency variable of the previous period, e (t) is the error signal, λ1Is the weighted value of the grid voltage frequency variable of the previous period, lambda2Is the weight value of the error signal.
5. Phase locked loop as claimed in claim 4, characterized in that λ1And said λ2The sum of (a) is 1, and said λ1Less than said lambda2。
6. The phase locked loop of claim 4, wherein the parameter adaptive controller is further configured to:
and if the current period is the first detection period, taking the standard gain coefficient as the gain parameter of the current period.
7. The phase-locked loop of any of claims 1-6, wherein the voltage-controlled oscillator is specifically configured to:
adding the power grid voltage frequency variable and the preset frequency value to obtain a power grid voltage frequency value;
integrating the power grid voltage frequency value to obtain a power grid voltage angle value;
taking a cosine function of the grid voltage phase angle value as the first grid voltage phase angle signal, and taking a sine function of the grid voltage phase angle as the second grid voltage phase angle signal.
8. Phase locked loop according to any of claims 1 to 6, wherein the amplitude tracker is specifically configured to:
multiplying the phase signal error by the second grid voltage phase angle signal to obtain a first product;
performing integral processing on the first product to obtain the amplitude of the voltage power grid in the current period;
and taking a second product of the voltage grid amplitude value and the second grid voltage phase angle signal as an output signal in the current period.
9. A method for controlling synchronization of grid voltage information based on a phase locked loop according to any one of claims 1 to 8, comprising:
comparing the input power grid voltage signal with an output signal fed back to the input end of the phase-locked loop by the amplitude tracker by using the comparator to obtain an input error signal and an output error signal of the phase-locked loop containing a phase error;
generating a gain parameter of the current period of the loop filter by using the parameter adaptive controller according to the acquired parameter reflecting the phase change;
integrating the error signal and a first grid voltage phase angle signal of a previous period fed back by the voltage-controlled oscillator by using the loop filter under the gain parameter of the current period to obtain a grid voltage frequency variable of the current period;
obtaining a first power grid voltage phase angle signal of the current period and a second power grid voltage phase angle signal of the current period by using the voltage-controlled oscillator according to the power grid voltage frequency variable and a preset frequency value;
and adjusting the output signal by using the amplitude tracker according to the error signal and a second grid voltage phase angle signal of the previous period fed back by the voltage-controlled oscillator so as to synchronize the output signal with the grid voltage signal.
10. A power electronic device, characterized in that a phase locked loop according to any of claims 1-8 is provided.
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