CN111865119A - Control method and device for four-quadrant converter - Google Patents
Control method and device for four-quadrant converter Download PDFInfo
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- CN111865119A CN111865119A CN202010612019.7A CN202010612019A CN111865119A CN 111865119 A CN111865119 A CN 111865119A CN 202010612019 A CN202010612019 A CN 202010612019A CN 111865119 A CN111865119 A CN 111865119A
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without 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
- H02M7/217—Conversion of ac power input into dc power output without 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
- H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Abstract
The embodiment of the application provides a method and a device for controlling a four-quadrant converter, wherein the method comprises the following steps: determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter; performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals; carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal; the method and the device can accurately generate the quadrature signals without increment based on the all-pass filter, and further realize the quick response and the non-static tracking of the current loop.
Description
Technical Field
The application relates to the field of electrical equipment, in particular to a four-quadrant converter control method and device.
Background
The four-quadrant converter is a key part of a train electrical system, and the research direction of the four-quadrant converter is mainly focused on a control system modulation algorithm, a current regulator design, grid side current harmonic suppression, rapid dynamic response control of direct current side voltage and the like at present.
The controller in the prior art has superiority in the non-static tracking performance of the power frequency alternating current signal, but the gain at the non-fundamental frequency is very small, so the performance of the controller is adversely affected when the frequency of a power grid deviates.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a four-quadrant converter control method and device, which can accurately generate an increment-free orthogonal signal based on an all-pass filter, and further realize the quick response and the non-static tracking of a current loop.
In order to solve at least one of the above problems, the present application provides the following technical solutions:
in a first aspect, the present application provides a four-quadrant converter control method, including:
determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter;
performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals;
and carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
Further, the performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotation coordinate system to obtain corresponding direct current signals includes:
and performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system, and determining corresponding d-axis current feedback values and q-axis current feedback values.
Further, the performing offset correction processing according to the dc signal to obtain a modulated voltage signal includes:
Inputting the d-axis current feedback value and a preset d-axis current given value into a first comparison unit for difference comparison to obtain a first difference result;
inputting the q-axis current feedback value and a preset q-axis current given value into a second comparison unit for difference comparison to obtain a second difference result;
and carrying out deviation correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal.
Further, the performing offset correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal includes:
performing deviation correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value;
and performing inverse coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotation coordinate system, and determining a corresponding modulation voltage signal.
In a second aspect, the present application provides a four-quadrant converter control apparatus, comprising:
the signal virtual construction module is used for determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter;
the AC-DC conversion module is used for carrying out coordinate conversion on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding DC signals;
And the modulation voltage signal determining module is used for carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
Further, the signal virtual construction module includes:
and the alpha beta/dq coordinate transformation unit is used for carrying out alpha beta/dq coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system and determining corresponding d-axis current feedback values and q-axis current feedback values.
Further, the modulation voltage signal determination module includes:
the first comparison unit is used for inputting the d-axis current feedback value and a preset d-axis current given value into the first comparison unit for difference comparison to obtain a first difference result;
the second comparison unit is used for inputting the q-axis current feedback value and a preset q-axis current given value into the second comparison unit for difference comparison to obtain a second difference result;
and the deviation correction unit is used for carrying out deviation correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal.
Further, the offset correction unit includes:
the voltage feedback value determining subunit is used for performing deviation correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value;
And the inverse alpha beta/dq coordinate transformation subunit is used for performing inverse alpha beta/dq coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotating coordinate system and determining a corresponding modulation voltage signal.
In a third aspect, the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the four-quadrant converter control method when executing the computer program.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the four-quadrant converter control method as described.
According to the technical scheme, the method and the device for controlling the four-quadrant converter virtually construct another orthogonal alternating current signal corresponding to the unique alternating current signal according to the net side voltage and the net side current through the preset all-pass filter, perform Park transformation according to the obtained pair of orthogonal signals, and construct the PI current regulator according to the Park transformation, so that the four-quadrant converter can track the net side current without static error.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a control method of a four-quadrant converter in an embodiment of the present application;
fig. 2 is a second flowchart of a control method of the four-quadrant converter according to the embodiment of the present application;
fig. 3 is a third schematic flowchart of a control method of a four-quadrant converter according to an embodiment of the present application;
fig. 4 is one of the structural diagrams of the four-quadrant converter control apparatus in the embodiment of the present application;
fig. 5 is a second structural diagram of a control device of a four-quadrant converter in an embodiment of the present application;
fig. 6 is a third structural diagram of a control device of a four-quadrant converter in an embodiment of the present application;
fig. 7 is a fourth block diagram of a control apparatus of a four-quadrant converter in the embodiment of the present application;
FIG. 8 is a schematic diagram of a four quadrant converter circuit in one embodiment of the present application;
FIG. 9 is a block diagram of a current controller pass with an all-pass filter in an exemplary embodiment of the present application;
FIG. 10 is a block diagram of PI current regulator control under a synchronous rotating coordinate system according to an embodiment of the present application;
FIG. 11 is a diagram of an all-pass filter transfer function Bode in an embodiment of the present application;
FIG. 12 is a block diagram of a four-quadrant converter control in an embodiment of the present application;
FIG. 13 is a diagram of a closed loop baud for a four quadrant converter of a PI current regulator using a synchronous rotating coordinate system in an embodiment of the present application;
fig. 14 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In consideration of the problem that a controller in the prior art has superiority in the non-static tracking performance of a power frequency alternating current signal, but has small gain at a non-fundamental frequency position, so that the performance of the controller is adversely affected when the frequency of a power grid shifts, the application provides a control method and a control device of a four-quadrant converter.
In order to accurately generate an increment-free quadrature signal based on an all-pass filter and further realize quick response and no-static-error tracking of a current loop, the present application provides an embodiment of a four-quadrant converter control method, and referring to fig. 1, the four-quadrant converter control method specifically includes the following contents:
step S101: and determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter.
It can be understood that the present application virtually constructs another ac signal corresponding to the net side voltage and net side current according to only one ac flow rate by presetting an all-pass filter (i.e. APF), so as to satisfy the two degree-of-freedom conditions of the subsequent coordinate transformation (i.e. orthogonal transformation), see fig. 11, and the generated orthogonal signal has a 90 ° phase difference from the original signal at the fundamental frequency of 50Hz, and has an amplitude gain of 0 at all frequency ranges.
Step S102: and carrying out coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals.
It can be understood that, referring to fig. 9, the present application implements conversion of an ac signal to a dc signal by presetting a synchronous rotating coordinate system in an α β/dq coordinate transformation module, that is, an ac quantity i in a stationary coordinate system α、iβCan be converted into direct current i under a synchronous rotating coordinate system through coordinate rotation transformationd、iq。
Step S103: and carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
It can be understood that, referring to fig. 10, after the pair of ac signals is obtained by the method of virtually constructing the quadrature current amount, the PI current regulator can be constructed in such a way as to perform an offset correction operation of the PI current regulator, thereby obtaining the modulation voltage signal.
As can be seen from the above description, according to the control method of the four-quadrant converter provided in the embodiment of the present application, another orthogonal ac signal corresponding to a preset all-pass filter can be virtually constructed according to a unique ac signal of the grid-side voltage and the grid-side current, Park transformation is performed on a pair of orthogonal signals obtained above, and a PI current regulator is constructed according to the pair of orthogonal signals, so as to implement non-static tracking of the grid-side current by the four-quadrant converter.
In order to accurately convert the ac signal into the dc signal, in an embodiment of the four-quadrant converter control method of the present application, the step S101 may further include the following steps:
and carrying out alpha beta/dq coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system, and determining corresponding d-axis current feedback values and q-axis current feedback values.
Optionally, referring to fig. 9, after the ac signal is converted into the dc signal through the APF coordinate, the coordinate conversion work of the synchronous rotating coordinate system can be further performed through the α β/dq coordinate conversion module, so as to obtain the d-axis current feedback value and the q-axis current feedback value corresponding to the d-axis and the q-axis in the synchronous rotating coordinate system.
In order to accurately perform the offset correction process, in an embodiment of the four-quadrant converter control method according to the present application, referring to fig. 2, the step S103 may further include the following steps:
step S201: and inputting the d-axis current feedback value and a preset d-axis current set value into a first comparison unit for difference comparison to obtain a first difference result.
Step S202: and inputting the q-axis current feedback value and a preset q-axis current given value into a second comparison unit for difference comparison to obtain a second difference result.
Step S203: and carrying out deviation correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal.
It can be understood that, referring to fig. 10, the obtained d-axis current feedback value and a preset d-axis current set value are input into the first comparing unit for difference comparison to obtain a first difference result; and meanwhile, inputting the obtained q-axis current feedback value and a preset q-axis current given value into a second comparison unit for difference comparison to obtain a second difference result, and constructing the PI current regulator to perform deviation correction operation of the PI current regulator so as to obtain a modulation voltage signal.
In order to obtain the modulation voltage signal, in an embodiment of the four-quadrant converter control method of the present application, referring to fig. 3, the step S203 may further include the following steps:
step S301: and carrying out deviation correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value.
Step S302: and performing inverse alpha beta/dq coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotation coordinate system, and determining a corresponding modulation voltage signal.
It is understood that referring to fig. 9, the present application may also provide an inverse α β/dq coordinate transformation module to transform ud、uqConversion to uα、uβI.e. an alternating modulated voltage signal.
In order to accurately generate an increment-free quadrature signal based on an all-pass filter, and further implement a fast response and a non-static tracking of a current loop, the present application provides an embodiment of a four-quadrant converter control apparatus for implementing all or part of the content of the four-quadrant converter control method, and referring to fig. 4, the four-quadrant converter control apparatus specifically includes the following content:
and the signal virtual construction module 10 is configured to determine at least one pair of orthogonal signals according to the network-side voltage, the network-side current, and a preset all-pass filter.
And the ac-dc conversion module 20 is configured to perform coordinate conversion on the pair of orthogonal signals according to a preset synchronous rotation coordinate system to obtain corresponding dc signals.
And the modulation voltage signal determining module 30 is configured to perform offset correction processing according to the dc signal to obtain a modulation voltage signal.
As can be seen from the above description, the four-quadrant converter control device provided in the embodiment of the present application can virtually construct another orthogonal ac signal corresponding to a preset all-pass filter according to a unique ac signal of a grid-side voltage and a grid-side current, perform Park transformation according to the pair of obtained orthogonal signals, and construct a PI current regulator according to the pair of obtained orthogonal signals, so as to implement non-static tracking of the four-quadrant converter on the grid-side current.
In order to accurately convert an ac signal into a dc signal, in an embodiment of the four-quadrant converter control device of the present application, referring to fig. 5, the signal virtual configuration module 10 includes:
and the alpha beta/dq coordinate transformation unit 11 is used for performing alpha beta/dq coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system, and determining corresponding d-axis current feedback values and q-axis current feedback values.
In order to accurately perform the offset correction process, in an embodiment of the four-quadrant converter control apparatus of the present application, referring to fig. 6, the modulation voltage signal determination module 30 includes:
And the first comparing unit 31 is used for inputting the d-axis current feedback value and a preset d-axis current set value into the first comparing unit for difference comparison to obtain a first difference result.
And the second comparison unit 32 is used for inputting the q-axis current feedback value and a preset q-axis current given value into the second comparison unit for difference comparison to obtain a second difference result.
And an offset correction unit 33, configured to perform offset correction processing according to the first difference result and the second difference result, so as to obtain a corresponding modulation voltage signal.
In order to obtain the modulated voltage signal, in an embodiment of the four-quadrant converter control apparatus of the present application, referring to fig. 7, the offset correction unit 33 includes:
a voltage feedback value determining subunit 331, configured to perform offset correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value;
and an inverse α β/dq coordinate transformation subunit 332, configured to perform inverse α β/dq coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotation coordinate system, and determine a corresponding modulation voltage signal.
To further illustrate the present disclosure, the present application further provides a specific application example of a method for implementing a four-quadrant converter control by using the four-quadrant converter control device, which specifically includes the following contents:
In the figures 8 and 10, the grid side voltage and current of the four-quadrant converter only have one alternating current ig(iα) At least two orthogonal AC flows i are needed to realize the coordinate transformation of the AC quantity PARKα、iβAlternating current quantities orthogonal to the network side current need to be virtualized respectively to satisfy two degree-of-freedom conditions of coordinate transformation. In fig. 9, the ac value in the stationary coordinate system can be converted into the dc value i in the synchronous rotating coordinate system by coordinate rotation transformationd、iq。
Fig. 11 is a bode plot of an all-pass filter, which generates a quadrature signal with 90 ° phase difference from the original signal at 50Hz fundamental frequency, while the amplitude gain is 0 at all frequency ranges.
The relationship between the orthogonal signal generated by the all-pass filter generation method and the original signal is as follows:
substituting fig. 9 the transfer function is simplified to obtain:
wherein, in formula 2 above:
therefore, the system frequency domain transfer function H(s) when the four-quadrant converter adopts the synchronous rotation coordinate system PI current regulator can be obtained, wherein Kp＝ωcbLg，Ki＝ωcbRg，ωcbThe bandwidth is designed for the current loop, here 1/5 times the system switching frequency.
In the general formula 2
And
substituting transfer function h(s) into the transfer diagram of fig. 12, one can deduce the system closed loop transfer function as:
wherein, in formula 3:
the bode diagram of the closed-loop transfer function of the system is shown in fig. 13 according to equation 3.
As can be seen from FIG. 13, the amplitude and phase of the system transfer function are all 0 at 50Hz, and the synchronous rotating coordinate system PI current regulator can realize the non-static tracking at the fundamental frequency of 50 Hz.
In terms of hardware, in order to accurately generate an increment-free quadrature signal based on an all-pass filter and further implement fast response and no-static-error tracking of a current loop, the present application provides an embodiment of an electronic device for implementing all or part of contents in the four-quadrant converter control method, where the electronic device specifically includes the following contents:
a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used for realizing information transmission between the four-quadrant converter control device and relevant equipment such as a core service system, a user terminal, a relevant database and the like; the logic controller may be a desktop computer, a tablet computer, a mobile terminal, and the like, but the embodiment is not limited thereto. In this embodiment, the logic controller may be implemented with reference to the embodiment of the four-quadrant converter control method and the embodiment of the four-quadrant converter control device in the embodiment, and the contents thereof are incorporated herein, and repeated descriptions are omitted.
It is understood that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), an in-vehicle device, a smart wearable device, and the like. Wherein, intelligence wearing equipment can include intelligent glasses, intelligent wrist-watch, intelligent bracelet etc..
In practical applications, part of the four-quadrant converter control method can be performed on the electronic device side as described above, and all the operations can be performed in the client device. The selection may be specifically performed according to the processing capability of the client device, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. The client device may further include a processor if all operations are performed in the client device.
The client device may have a communication module (i.e., a communication unit), and may be communicatively connected to a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, the server may also include a server on an intermediate platform, for example, a server on a third-party server platform that is communicatively linked to the task scheduling center server. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed apparatus.
Fig. 14 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 14, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this FIG. 14 is exemplary; other types of structures may also be used in addition to or in place of the structure to implement telecommunications or other functions.
In one embodiment, the four-quadrant converter control method functions may be integrated into the central processor 9100. The central processor 9100 may be configured to control as follows:
step S101: and determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter.
Step S102: and carrying out coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals.
Step S103: and carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
As can be seen from the above description, in the electronic device provided in the embodiment of the present application, another orthogonal ac signal corresponding to the unique ac signal of the grid-side voltage and the grid-side current is virtually constructed through a preset all-pass filter according to the unique ac signal, and then Park transformation is performed on the pair of orthogonal signals obtained above, so as to construct a PI current regulator, so as to implement non-static tracking of the grid-side current by the four-quadrant converter.
In another embodiment, the four-quadrant converter control device may be configured separately from the central processing unit 9100, for example, the four-quadrant converter control device may be configured as a chip connected to the central processing unit 9100, and the four-quadrant converter control method function may be implemented by the control of the central processing unit.
As shown in fig. 14, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 also does not necessarily include all of the components shown in fig. 14; further, the electronic device 9600 may further include components not shown in fig. 14, which can be referred to in the related art.
As shown in fig. 14, a central processor 9100, sometimes referred to as a controller or operational control, can include a microprocessor or other processor device and/or logic device, which central processor 9100 receives input and controls the operation of the various components of the electronic device 9600.
The memory 9140 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to realize information storage or processing, or the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. Power supply 9170 is used to provide power to electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, an LCD display, but is not limited thereto.
The memory 9140 can be a solid state memory, e.g., Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 9140 could also be some other type of device. Memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 being used for storing application programs and function programs or for executing a flow of operations of the electronic device 9600 by the central processor 9100.
The memory 9140 can also include a data store 9143, the data store 9143 being used to store data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers for the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, contact book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing ordinary telecommunications functions. The audio processor 9130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling recording locally through the microphone 9132 and enabling locally stored sounds to be played through the speaker 9131.
An embodiment of the present application further provides a computer-readable storage medium capable of implementing all the steps in the four-quadrant converter control method implemented mainly by a server or a client in the foregoing embodiments, where the computer-readable storage medium stores thereon a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the four-quadrant converter control method implemented mainly by a server or a client in the foregoing embodiments, for example, when the processor executes the computer program, the processor implements the following steps:
Step S101: and determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter.
Step S102: and carrying out coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals.
Step S103: and carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
As can be seen from the above description, in the computer-readable storage medium provided in the embodiments of the present application, another orthogonal ac signal corresponding to the unique ac signal of the grid-side voltage and the grid-side current is virtually constructed through a preset all-pass filter, and then a Park transformation is performed on the pair of orthogonal signals obtained above, so as to construct a PI current regulator, so as to implement non-static tracking of the grid-side current by the four-quadrant converter.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A four-quadrant converter control method, characterized in that the method comprises:
determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter;
performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals;
And carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
2. The control method of the four-quadrant converter according to claim 1, wherein the performing coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding direct current signals comprises:
and carrying out alpha beta/dq coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system, and determining corresponding d-axis current feedback values and q-axis current feedback values.
3. The method of claim 2, wherein the performing an offset correction process according to the dc signal to obtain a modulated voltage signal comprises:
inputting the d-axis current feedback value and a preset d-axis current given value into a first comparison unit for difference comparison to obtain a first difference result;
inputting the q-axis current feedback value and a preset q-axis current given value into a second comparison unit for difference comparison to obtain a second difference result;
and carrying out deviation correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal.
4. The method of claim 3, wherein the performing a bias correction process according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal comprises:
Performing deviation correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value;
and performing inverse alpha beta/dq coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotation coordinate system, and determining a corresponding modulation voltage signal.
5. A four-quadrant converter control apparatus, comprising:
the signal virtual construction module is used for determining at least one pair of orthogonal signals according to the network side voltage, the network side current and a preset all-pass filter;
the AC-DC conversion module is used for carrying out coordinate conversion on the pair of orthogonal signals according to a preset synchronous rotating coordinate system to obtain corresponding DC signals;
and the modulation voltage signal determining module is used for carrying out deviation correction processing according to the direct current signal to obtain a modulation voltage signal.
6. The four-quadrant converter control apparatus according to claim 5, wherein the signal virtual construction module comprises:
and the alpha beta/dq coordinate transformation unit is used for carrying out alpha beta/dq coordinate transformation on the pair of orthogonal signals according to a preset synchronous rotating coordinate system and determining corresponding d-axis current feedback values and q-axis current feedback values.
7. The four-quadrant converter control apparatus according to claim 6, wherein the modulation voltage signal determination module comprises:
the first comparison unit is used for inputting the d-axis current feedback value and a preset d-axis current given value into the first comparison unit for difference comparison to obtain a first difference result;
the second comparison unit is used for inputting the q-axis current feedback value and a preset q-axis current given value into the second comparison unit for difference comparison to obtain a second difference result;
and the deviation correction unit is used for carrying out deviation correction processing according to the first difference result and the second difference result to obtain a corresponding modulation voltage signal.
8. The four-quadrant converter control apparatus according to claim 7, wherein the offset correction unit comprises:
the voltage feedback value determining subunit is used for performing deviation correction processing according to the first difference result and the second difference result to obtain a d-axis voltage feedback value and a q-axis voltage feedback value;
and the inverse alpha beta/dq coordinate transformation subunit is used for performing inverse alpha beta/dq coordinate transformation on the d-axis voltage feedback value and the q-axis voltage feedback value according to a preset synchronous rotating coordinate system and determining a corresponding modulation voltage signal.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the four-quadrant converter control method according to any of claims 1 to 4 are implemented when the processor executes the program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the four-quadrant converter control method according to any one of claims 1 to 4.
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