CN110855164A - Control method, system and terminal equipment - Google Patents
Control method, system and terminal equipment Download PDFInfo
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- CN110855164A CN110855164A CN201911199045.5A CN201911199045A CN110855164A CN 110855164 A CN110855164 A CN 110855164A CN 201911199045 A CN201911199045 A CN 201911199045A CN 110855164 A CN110855164 A CN 110855164A
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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
- H02M7/2173—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 biphase or polyphase circuit arrangement
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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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Abstract
The invention is applicable to the technical field of rectification, and provides a control method, a control system and terminal equipment. The control method is applied to a three-phase three-level VIENNA rectifier and comprises the following steps: determining a power supply period of a power supply of a target phase, wherein the target phase is any one of an A phase, a B phase and a C phase; if the power supply of the target phase is in the positive half cycle of the power supply, sending a first control signal to the rectifier module corresponding to the target, wherein the first control signal enables the diode of the lower bridge arm in the rectifier module corresponding to the target to be uniformly divided; and if the power supply of the target phase is in the negative half cycle of the power supply, sending a second control signal to the rectifier module corresponding to the target, wherein the second control signal enables the diode of the upper bridge arm in the rectifier module corresponding to the target to uniformly divide the voltage. The invention can select the diode with proper voltage resistance according to the bus voltage, can realize high reliability without using the diode with higher voltage resistance, can reduce the cost of the whole machine and improve the efficiency of the whole machine.
Description
Technical Field
The invention belongs to the technical field of rectification, and particularly relates to a control method, a control system and terminal equipment.
Background
The three-phase three-level VIENNA rectifier has the advantages of few switching devices, small total harmonic distortion, high power factor and the like, is widely applied to projects such as a direct-current charging power supply, active filtering, an uninterruptible power supply and the like, and a typical application circuit of the three-phase three-level VIENNA rectifier is shown in fig. 1.
At present, the control method for the three-phase three-level VIENNA rectifier is as follows: taking phase A as an example, the switching tube S is controlleda1And a switching tube Sa2Simultaneously on and simultaneously off. With eaFor example > 0, i.e. in the positive half cycle of the power supply, phase A current Ia has two current paths, the first path is current through L1-DRa1-Da1-BUS +, the second path being current through L1-DRa1-Sa1-O. When the current flows from the first path, the diode DRa2And a diode Da2Bear the whole bus voltage, in the practical application process, because the parasitic parameters of the diode are different, the corresponding RC absorption parameters are different, and the voltage division of the diode is uneven.
If the diode with the voltage withstanding value smaller than the bus voltage is selected, the diode is easily damaged; if the diode with the voltage withstanding value larger than the bus voltage is selected, the device cost is greatly increased, and meanwhile, when the diode bears higher voltage stress, the corresponding tube voltage drop is increased, so that the conduction loss of the diode is increased, and the efficiency of the whole machine is reduced. Therefore, the existing control method cannot simultaneously ensure the reliability, high efficiency and low cost of the three-phase three-level VIENNA rectifier.
Disclosure of Invention
In view of this, embodiments of the present invention provide a control method, a control system, and a terminal device, so as to solve the problem that the existing control method cannot simultaneously ensure the reliability, high efficiency, and low cost of a three-phase three-level VIENNA rectifier.
The first aspect of the embodiments of the present invention provides a control method, which is applied to a three-phase three-level VIENNA rectifier, where the three-phase three-level VIENNA rectifier includes a rectification module corresponding to each phase power supply; the control method comprises the following steps:
determining a power supply period of a power supply of a target phase, wherein the target phase is any one of an A phase, a B phase and a C phase;
if the power supply of the target phase is in the positive half cycle of the power supply, sending a first control signal to the rectifier module corresponding to the target, wherein the first control signal enables the diode of the lower bridge arm in the rectifier module corresponding to the target to be uniformly divided;
and if the power supply of the target phase is in the negative half cycle of the power supply, sending a second control signal to the rectifying module corresponding to the target, wherein the second control signal enables the diode of the upper bridge arm in the rectifying module corresponding to the target to be uniformly divided.
A second aspect of an embodiment of the present invention provides a control system, which is applied to a three-phase three-level VIENNA rectifier, where the three-phase three-level VIENNA rectifier includes a rectifying module corresponding to each phase power supply; the control system includes:
the power supply cycle determining module is used for determining the power supply cycle of a power supply of a target phase, wherein the target phase is any one of an A phase, a B phase and a C phase;
the positive half-cycle processing module is used for sending a first control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the positive half cycle of the power supply, and the first control signal enables the diode of the lower bridge arm in the rectifying module corresponding to the target to be uniformly divided;
and the negative half cycle processing module is used for sending a second control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the negative half cycle of the power supply, and the second control signal enables the diode of the upper bridge arm in the rectifying module corresponding to the target to uniformly divide voltage.
A third aspect of embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the control method according to the first aspect when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program, which when executed by one or more processors implements the steps of the control method according to the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: when a power supply of a target phase is in a positive half cycle of the power supply, a first control signal is sent to a rectifier module corresponding to the target to enable a diode of a lower bridge arm in the rectifier module to uniformly divide voltagea2And a diode Da2The stress of (a) is half of the bus voltage; when the power supply of the target phase is in the negative half cycle of the power supply, a second control signal is sent to the rectifier module corresponding to the target, so that the diode of the upper bridge arm in the rectifier module corresponding to the target is uniformly divided, taking phase A as an example, when the current flow path is BUS-Da2-DRa2at-L1, diode DRa1And a diode Da1The stress of the diode is half of the bus voltage, so that a diode with proper withstand voltage can be selected according to the bus voltage, high reliability can be realized without using a diode with higher withstand voltage, the cost of the whole machine can be reduced, and the efficiency of the whole machine is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions 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 based on these drawings without inventive exercise.
FIG. 1 is a circuit schematic of a prior art three-phase three-level VIENNA rectifier;
fig. 2 is a schematic flow chart illustrating an implementation of a control method according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a control system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 2 is a schematic flow chart of an implementation of the control method according to an embodiment of the present invention, and for convenience of description, only a part related to the embodiment of the present invention is shown. The execution main body of the embodiment of the invention can be terminal equipment.
The control method is applied to a three-phase three-level VIENNA rectifier which comprises rectifying modules corresponding to all phase power supplies. Specifically, circuit structure diagram of three-phase three-level VIENNA rectifier referring to fig. 1, a-phase power supply eaCorresponding to the A-phase rectifier module 10 and the C-phase power supply ebCorresponding to the B-phase rectifier module 20, C-phase power supply ecThe internal structure of each rectifier module is the same for the C-phase rectifier module 30.
As shown in fig. 2, the control method may include the steps of:
s201: and determining the power supply period of the power supply of the target phase, wherein the target phase is any one of the phases A, B and C.
Specifically, the control method of the rectifier is different when the power cycle of the power source of the target phase is determined to be the positive half cycle or the negative half cycle of the power source, and the power source of the target phase is determined to be the positive half cycle or the negative half cycle of the power source.
In an embodiment of the present invention, the "determining the power cycle in which the power of the target phase is located" in the step S201 includes:
acquiring a voltage sampling value of a power supply of a target phase;
if the voltage sampling value is greater than or equal to 0, determining that the power supply of the target phase is in the positive half cycle of the power supply;
and if the voltage sampling value is less than 0, determining that the power supply of the target phase is in the negative half cycle of the power supply.
In the embodiment of the invention, the sampling circuit can be used for sampling the real-time voltage of each phase of power supply to obtain the real-time voltage sampling value of each phase of power supply.
And determining whether the power supply of the target phase is in the positive half cycle or the negative half cycle of the power supply by judging the acquired voltage sampling value of the power supply of the target phase and the value of 0. Taking the target phase as the phase a as an example, if the voltage sampling value of the phase a power supply is greater than or equal to 0, determining that the phase a power supply is in the positive half cycle of the power supply; and if the voltage sampling value of the power supply of the phase A is less than 0, determining that the power supply of the phase A is in the negative half cycle of the power supply.
In an embodiment of the present invention, before the step S201, the control method may further include the steps of:
based on the voltage space vector, the phase in operation is determined and the phase in operation is designated as the target phase.
Specifically, a sector where the current vector is located is judged according to the voltage space vector, and a target phase is determined according to the sector where the current vector is located, so that the target phase is controlled to be switched on and off.
S202: and if the power supply of the target phase is in the positive half cycle of the power supply, sending a first control signal to the rectifier module corresponding to the target, wherein the first control signal enables the diode of the lower bridge arm in the rectifier module corresponding to the target to be uniformly divided.
In one embodiment of the invention, the rectifier module corresponding to the target comprises an upper bridge arm switching tube and a lower bridge arm switching tube;
the step S202 of "sending the first control signal to the rectifier module corresponding to the target" includes:
sending a first pulse width modulation signal to an upper bridge arm switching tube, wherein the first pulse width modulation signal is used for carrying out chopping control on the upper bridge arm switching tube;
and sending a first normally open control signal to the lower bridge arm switch tube, wherein the first normally open control signal is used for indicating that the lower bridge arm switch tube is in an open state.
In the embodiment of the invention, the rectifier modules corresponding to the power supplies of all phases respectively comprise an upper bridge arm switching tube, a lower bridge arm switching tube, two upper bridge arm diodes and two lower bridge arm diodes.
Specifically, referring to fig. 1, taking phase a as an example, the phase a rectifier module 10 includes a phase a upper arm switch tube Sa1Phase A lower bridge arm switch tube Sa2First A phase upper bridge arm diode DRa1A second A phase upper bridge arm diode Da1First A-phase lower bridge arm diode DRa2And a second A-phase lower arm diode Da2。
A-phase upper bridge arm switch tube Sa1The grid of the grid is connected with the terminal equipment and used for receiving a control signal sent by the terminal equipment; a-phase upper bridge arm switch tube Sa1The source electrodes of the A-phase lower bridge arm switching tubes S are respectively connected with the A-phase lower bridge arm switching tubes Sa2Is connected with the zero line O; a-phase upper bridge arm switch tube Sa1And the drain electrodes of the first and second A-phase upper bridge arm diodes Da1Positive pole of (1) and first a-phase upper arm diode DRa1The negative electrode of (1) is connected; second a-phase upper bridge arm diode Da1The negative electrode of the positive BUS is connected with the positive BUS; first A-phase upper bridge arm diode DRa1The positive pole of the first inductor L1 and the A-direction power supply eaAnd (4) connecting.
A-phase lower bridge arm switch tube Sa2The grid of the grid is connected with the terminal equipment and used for receiving a control signal sent by the terminal equipment; a-phase lower bridge arm switch tube Sa2Respectively with the second A-phase lower bridge armDiode Da2And a first phase a lower arm diode DRa2Is connected with the anode of the second A-phase lower bridge arm diode Da2The positive pole of the positive pole is connected with a negative BUS BUS-; first A-phase lower bridge arm diode DRa2And the first phase a upper bridge arm diode DRa1Is connected to the positive electrode.
The structures of the B-phase rectification module 20 and the C-phase rectification module 30 are the same as the structure of the a-phase rectification module 10, and reference may be made to fig. 1 specifically, and details are not repeated here.
The target phase is specifically described as phase A. If the power supply of the a phase is in the positive half cycle of the power supply, the switching tube S of the a phase upper arm included in the a phase rectifier module 10a1A first pulse width modulated signal is transmitted, which may be a high level and low level interleaved pulse signal. The first pulse width modulation signal can be used for switching the A-phase upper bridge arm switch tube Sa1Chopping control is carried out, namely when the first pulse width modulation signal is in a high level signal, the switching tube S of the A-phase upper bridge arm can be controlleda1When the first pulse width modulation signal is at a low level signal, the switching tube S of the upper bridge arm of the phase A can be controlleda1And (6) turning off.
If the power supply of the a phase is in the positive half cycle of the power supply, the switching tube S of the a phase lower arm included in the a phase rectifier module 10a2A first normally open control signal is sent, which may be a high level signal. The first normally open control signal can control the A-phase lower bridge arm switch tube Sa2Is in a normally open state.
If the power supply of the A phase is in the positive half cycle of the power supply, the current flow path is L1-DRa1-Da1-BUS +, A phase lower bridge arm switch tube Sa2The voltage of the A2 can be clamped to the midpoint of the bus to enable the first A-phase lower bridge arm diode DR to be in an on state all the timea2And a second A-phase lower arm diode Da2The stress of (A) is half of the bus voltage even if the first A phase lower bridge arm diode DRa2And a second A-phase lower arm diode Da2The partial pressure is uniform.
The principle of the phases B and C is similar to that of the phase A, and the description is omitted.
S203: and if the power supply of the target phase is in the negative half cycle of the power supply, sending a second control signal to the rectifier module corresponding to the target, wherein the second control signal enables the diode of the upper bridge arm in the rectifier module corresponding to the target to uniformly divide the voltage.
In one embodiment of the invention, the rectifier module corresponding to the target comprises an upper bridge arm switching tube and a lower bridge arm switching tube;
the step S203 of "sending the second control signal to the rectifier module corresponding to the target" includes:
sending a second normally-open control signal to the upper bridge arm switch tube, wherein the second normally-open control signal is used for indicating that the upper bridge arm switch tube is in a switched-on state;
and sending a second pulse width modulation signal to the lower bridge arm switching tube, wherein the second pulse width modulation signal is used for carrying out chopping control on the lower bridge arm switching tube.
The target phase is specifically described as phase A. If the power supply of the a phase is in the negative half cycle of the power supply, the switching tube S of the a phase upper arm included in the a phase rectifier module 10a1A second normally open control signal is sent, which may be a high level signal. The second normally open control signal can control the A-phase upper bridge arm switch tube Sa1Is in a normally open state.
If the power supply of the a phase is in the negative half cycle of the power supply, the a phase lower arm switching tube S included in the a phase rectifier module 10 is switched ona2A second pulse width modulated signal is transmitted, which may be a high level and low level interleaved pulse signal. The second pulse width modulation signal can be used for switching the A-phase lower bridge arm switch tube Sa2Chopping control is carried out, namely when the second pulse width modulation signal is in a high level signal, the A-phase lower bridge arm switching tube S can be controlleda2When the second pulse width modulation signal is at a low level signal, the switching tube S of the A-phase lower bridge arm can be controlleda2And (6) turning off.
If the power supply of the A phase is in the negative half cycle of the power supply, the current flow path is BUS-Da2-DRa2at-L1, the A-phase upper arm switch tube Sa1The voltage of the A1 can be clamped to the midpoint of the bus to enable the first A-phase upper bridge arm diode DR to be in an on state all the timea1And a second A-phase upper arm diode Da1The stress of (a) is half the bus voltage.
The principle of the phases B and C is similar to that of the phase A, and the description is omitted.
As can be seen from the above description, in the embodiment of the present invention, when the power source of the target phase is in the positive half cycle of the power source, the first control signal is sent to the rectifier module corresponding to the target, so that the diodes of the lower bridge arm in the rectifier module are uniformly divided, taking phase a as an example, when the current flows through the first path, the diode DRa2And a diode Da2The stress of (a) is half of the bus voltage; when the power supply of the target phase is in the negative half cycle of the power supply, a second control signal is sent to the rectifier module corresponding to the target, so that the diode of the upper bridge arm in the rectifier module corresponding to the target is uniformly divided, taking phase A as an example, when the current flow path is BUS-Da2-DRa2at-L1, diode DRa1And a diode Da1The stress of the diode is half of the bus voltage, so that a diode with proper withstand voltage can be selected according to the bus voltage, high reliability can be realized without using a diode with higher withstand voltage, the cost of the whole machine can be reduced, and the efficiency of the whole machine is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 3 is a schematic block diagram of a control system according to an embodiment of the present invention, and only a part related to the embodiment of the present invention is shown for convenience of explanation.
In the embodiment of the present invention, the control system 300 is applied to a three-phase three-level VIENNA rectifier, which includes a rectifying module corresponding to each phase power supply;
the control system 300 may include: a power cycle determination module 301, a positive half cycle processing module 302, and a negative half cycle processing module 303.
The power cycle determining module 301 is configured to determine a power cycle of a power source of a target phase, where the target phase is any one of a phase a, a phase B, and a phase C;
the positive half-cycle processing module 302 is configured to send a first control signal to the rectifier module corresponding to the target if the power supply of the target phase is in the positive half-cycle of the power supply, where the first control signal enables a diode of a lower bridge arm in the rectifier module corresponding to the target to uniformly divide voltage;
and the negative half-cycle processing module 303 is configured to send a second control signal to the rectifier module corresponding to the target if the power supply of the target phase is in the negative half-cycle of the power supply, where the second control signal enables a diode of an upper bridge arm in the rectifier module corresponding to the target to uniformly divide voltage.
Optionally, the rectifier module corresponding to the target includes an upper bridge arm switching tube and a lower bridge arm switching tube;
the positive half-cycle processing module 302 may include: the device comprises a first pulse signal sending unit and a first normally open control signal sending unit.
The first pulse signal sending unit is used for sending a first pulse width modulation signal to the upper bridge arm switching tube, and the first pulse width modulation signal is used for carrying out chopping control on the upper bridge arm switching tube;
and the first normally open control signal sending unit is used for sending a first normally open control signal to the lower bridge arm switch tube, and the first normally open control signal is used for indicating that the lower bridge arm switch tube is in a switched-on state.
Optionally, the rectifier module corresponding to the target includes an upper bridge arm switching tube and a lower bridge arm switching tube;
the negative half-cycle processing module 303 may include: the second normally open control signal sending unit and the second pulse signal sending unit.
The second normally-open control signal sending unit is used for sending a second normally-open control signal to the upper bridge arm switch tube, and the second normally-open control signal is used for indicating that the upper bridge arm switch tube is in an open state;
and the second pulse signal sending unit is used for sending a second pulse width modulation signal to the lower bridge arm switching tube, and the second pulse width modulation signal is used for carrying out chopping control on the lower bridge arm switching tube.
Optionally, the control system 300 may further include an operating phase determination module.
And the working phase determining module is used for determining the working phase based on the voltage space vector and marking the working phase as the target phase.
Optionally, the power cycle determining module 301 may be specifically configured to:
acquiring a voltage sampling value of a power supply of a target phase;
if the voltage sampling value is greater than or equal to 0, determining that the power supply of the target phase is in the positive half cycle of the power supply;
and if the voltage sampling value is less than 0, determining that the power supply of the target phase is in the negative half cycle of the power supply.
It will be apparent to those skilled in the art that, for convenience and simplicity of description, the foregoing functional units and modules are merely illustrated in terms of division, and in practical applications, the foregoing functional allocation may be performed by different functional units and modules as needed, that is, the internal structure of the control system is divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 400 of this embodiment includes: one or more processors 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processors 401. The processor 401 implements the steps in the above-described respective control method embodiments, such as steps S201 to S203 shown in fig. 2, when executing the computer program 403. Alternatively, the processor 401, when executing the computer program 403, implements the functions of the modules/units in the control system embodiment, such as the functions of the modules 301 to 303 shown in fig. 3.
Illustratively, the computer program 403 may be partitioned into one or more modules/units that are stored in the memory 402 and executed by the processor 401 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program 403 in the terminal device 400. For example, the computer program 403 may be divided into a power cycle determination module, a positive half cycle processing module and a negative half cycle processing module, and each module has the following specific functions:
the power supply period determining module is used for determining the power supply period of a power supply of a target phase, wherein the target phase is any one of the phases A, B and C;
the positive half-cycle processing module is used for sending a first control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the positive half cycle of the power supply, and the first control signal enables the diode of the lower bridge arm in the rectifying module corresponding to the target to uniformly divide voltage;
and the negative half cycle processing module is used for sending a second control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the negative half cycle of the power supply, and the second control signal enables the diode of the upper bridge arm in the rectifying module corresponding to the target to uniformly divide the voltage.
Other modules or units can refer to the description of the embodiment shown in fig. 3, and are not described again here.
The terminal device 400 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices, and the terminal device 400 may also be a Digital Signal Processor (DSP). The terminal device 400 includes, but is not limited to, a processor 401 and a memory 402. Those skilled in the art will appreciate that fig. 4 is only one example of a terminal device 400 and does not constitute a limitation of terminal device 400, and may include more or less components than those shown, or combine certain components, or different components, for example, terminal device 400 may also include input devices, output devices, network access devices, buses, etc.
The Processor 401 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 402 may be an internal storage unit of the terminal device 400, such as a hard disk or a memory of the terminal device 400. The memory 402 may also be an external storage device of the terminal device 400, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 400. Further, the memory 402 may also include both an internal storage unit of the terminal device 400 and an external storage device. The memory 402 is used for storing the computer program 403 and other programs and data required by the terminal device 400. The memory 402 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed control system and method may be implemented in other ways. For example, the above described control system embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A control method is characterized by being applied to a three-phase three-level VIENNA rectifier, wherein the three-phase three-level VIENNA rectifier comprises rectifying modules corresponding to power supplies of all phases respectively; the control method comprises the following steps:
determining a power supply period of a power supply of a target phase, wherein the target phase is any one of an A phase, a B phase and a C phase;
if the power supply of the target phase is in the positive half cycle of the power supply, sending a first control signal to the rectifier module corresponding to the target, wherein the first control signal enables the diode of the lower bridge arm in the rectifier module corresponding to the target to be uniformly divided;
and if the power supply of the target phase is in the negative half cycle of the power supply, sending a second control signal to the rectifying module corresponding to the target, wherein the second control signal enables the diode of the upper bridge arm in the rectifying module corresponding to the target to be uniformly divided.
2. The control method according to claim 1, wherein the rectifier modules corresponding to the targets comprise upper bridge arm switching tubes and lower bridge arm switching tubes;
the sending of the first control signal to the rectifying module corresponding to the target includes:
sending a first pulse width modulation signal to the upper bridge arm switching tube, wherein the first pulse width modulation signal is used for carrying out chopping control on the upper bridge arm switching tube;
and sending a first normally open control signal to the lower bridge arm switch tube, wherein the first normally open control signal is used for indicating that the lower bridge arm switch tube is in a switched-on state.
3. The control method according to claim 1, wherein the rectifier modules corresponding to the targets comprise upper bridge arm switching tubes and lower bridge arm switching tubes;
the sending of the second control signal to the rectifying module corresponding to the target includes:
sending a second normally-open control signal to the upper bridge arm switching tube, wherein the second normally-open control signal is used for indicating that the upper bridge arm switching tube is in a switching-on state;
and sending a second pulse width modulation signal to the lower bridge arm switching tube, wherein the second pulse width modulation signal is used for carrying out chopping control on the lower bridge arm switching tube.
4. The control method according to claim 1, wherein before the determining of the power cycle in which the power of the target phase that is operating is located, the control method further comprises:
and determining a working phase based on the voltage space vector, and recording the working phase as the target phase.
5. The control method according to any one of claims 1 to 4, wherein the determining of the power supply cycle in which the power supply of the target phase is located includes:
acquiring a voltage sampling value of the power supply of the target phase;
if the voltage sampling value is greater than or equal to 0, determining that the power supply of the target phase is in the positive half cycle of the power supply;
and if the voltage sampling value is less than 0, determining that the power supply of the target phase is in the negative half cycle of the power supply.
6. A control system is characterized by being applied to a three-phase three-level VIENNA rectifier, wherein the three-phase three-level VIENNA rectifier comprises rectifying modules corresponding to power supplies of all phases respectively; the control system includes:
the power supply cycle determining module is used for determining the power supply cycle of a power supply of a target phase, wherein the target phase is any one of an A phase, a B phase and a C phase;
the positive half-cycle processing module is used for sending a first control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the positive half cycle of the power supply, and the first control signal enables the diode of the lower bridge arm in the rectifying module corresponding to the target to be uniformly divided;
and the negative half cycle processing module is used for sending a second control signal to the rectifying module corresponding to the target if the power supply of the target phase is in the negative half cycle of the power supply, and the second control signal enables the diode of the upper bridge arm in the rectifying module corresponding to the target to uniformly divide voltage.
7. The control system of claim 6, wherein the target-corresponding rectifier modules comprise an upper bridge arm switching tube and a lower bridge arm switching tube;
the positive half-cycle processing module comprises:
the first pulse signal sending unit is used for sending a first pulse width modulation signal to the upper bridge arm switching tube, and the first pulse width modulation signal is used for carrying out chopping control on the upper bridge arm switching tube;
and the first normally open control signal sending unit is used for sending a first normally open control signal to the lower bridge arm switch tube, and the first normally open control signal is used for indicating that the lower bridge arm switch tube is in a switched-on state.
8. The control system of claim 6, wherein the target-corresponding rectifier modules comprise an upper bridge arm switching tube and a lower bridge arm switching tube;
the negative half-cycle processing module comprises:
the second normally-open control signal sending unit is used for sending a second normally-open control signal to the upper bridge arm switch tube, and the second normally-open control signal is used for indicating that the upper bridge arm switch tube is in a switched-on state;
and the second pulse signal sending unit is used for sending a second pulse width modulation signal to the lower bridge arm switching tube, and the second pulse width modulation signal is used for carrying out chopping control on the lower bridge arm switching tube.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the control method according to any of claims 1 to 5 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by one or more processors, implements the steps of the control method according to any one of claims 1 to 5.
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