CN116317659A - Mixed switching modulation method and system - Google Patents

Mixed switching modulation method and system Download PDF

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Publication number
CN116317659A
CN116317659A CN202310249412.8A CN202310249412A CN116317659A CN 116317659 A CN116317659 A CN 116317659A CN 202310249412 A CN202310249412 A CN 202310249412A CN 116317659 A CN116317659 A CN 116317659A
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modulation
phase
distance
ratio
wave
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王一鸣
许颇
刘聪哲
王海鹏
杨晨
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Ginlong Technologies Co Ltd
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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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac 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
    • H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
    • 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
    • H02M1/0012—Control circuits using digital or numerical techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

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  • Power Engineering (AREA)
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Abstract

The invention provides a method and a system for hybrid switching modulation, wherein the method comprises the following steps: obtaining SPWM three-phase modulation waves generated by a sinusoidal pulse width modulation method; sampling the SPWM three-phase modulation wave to obtain a first sampling result; calculating a modulation ratio of the first sampling result, and judging whether the modulation ratio is larger than or equal to a preset modulation ratio, wherein the modulation ratio is a ratio of a spatial reference voltage vector amplitude to a direct current bus voltage; when the modulation ratio is greater than or equal to the preset modulation ratio, overlapping zero sequence components into the SPWM three-phase modulation wave to obtain a DPWMA three-phase modulation wave, wherein the DPWMA three-phase modulation wave is used for increasing the voltage utilization rate of the SPWM three-phase modulation wave.

Description

Mixed switching modulation method and system
Technical Field
The invention relates to the technical field of photovoltaic inverters, in particular to a hybrid switching modulation method and system.
Background
The sine pulse width modulation method is a mature and widely used pulse width modulation method, and is based on the principle that the effects of narrow pulses with equal impulse and different shapes are basically the same when the narrow pulses are added to links with inertia, and the equivalent output voltage is changed by controlling the on-off of a switching tube in an inverter circuit by using pulse width modulation waveforms with the pulse width according to the change of a sine rule and the equivalent of a sine wave. Although a three-phase sinusoidal voltage can be obtained by a sinusoidal pulse width modulation method, the voltage utilization rate of the DC side of the modulation method is low, and the switching times of switching tube elements in a circuit are more, so that the switching loss is high.
In some modulation schemes, the problems of low voltage utilization rate and high switching loss can be solved by improving the sine pulse width modulation method, but other problems such as electromagnetic interference can be introduced, and the problems of low voltage utilization rate and high switching loss in the modulation process are improved based on the sine pulse width modulation method.
Disclosure of Invention
The invention solves the problem of improving the voltage utilization rate in the modulation process of a sine pulse width modulation method.
To solve the above problems, in a first aspect, the present invention provides a hybrid switching modulation method, including:
obtaining SPWM three-phase modulation waves generated by a sinusoidal pulse width modulation method;
sampling the SPWM three-phase modulation wave to obtain a first sampling result;
calculating a modulation ratio of the first sampling result, and judging whether the modulation ratio is larger than or equal to a preset modulation ratio, wherein the modulation ratio is a ratio of a spatial reference voltage vector amplitude to a direct current bus voltage;
and when the modulation ratio is greater than or equal to the preset modulation ratio, overlapping zero sequence components into the SPWM three-phase modulation wave to obtain the DPWMA three-phase modulation wave.
Compared with the prior art, the invention combines the advantages of a sine pulse width modulation method and DPWMA modulation, obtains a sampling result by sampling the three-phase modulation wave, judges whether the modulation ratio of the sampling result is larger than or equal to the preset modulation ratio, and if the modulation ratio is too large, the voltage utilization rate of the three-phase modulation wave obtained by the sine pulse width modulation method is lower at the sampling moment, and the zero sequence component is superimposed on the basis of the SPWM three-phase modulation wave, so that the switching frequency of a switching tube in the three-phase inverter can be reduced, the switching loss is reduced, and meanwhile, the voltage utilization rate of the three-phase modulation wave can be improved.
Optionally, before the zero sequence component is superimposed into the SPWM three-phase modulated wave when the modulation ratio is greater than or equal to the preset modulation ratio, the method further includes:
determining a first distance and a second distance between each per unit value of each phase of electric signals in the three-phase electric signals and a modulating wave boundary according to the per unit value of the SPWM three-phase modulating wave, wherein 1, 0 and-1 are taken as the modulating wave boundary, when the per unit value is between 0 and 1, the first distance is the distance between the per unit value and 1, and the second distance is the distance between the per unit value and 0; when the per unit value is between-1 and 0, the first distance is the distance between the per unit value and 0, and the second distance is the distance between the per unit value and-1;
and determining the zero sequence component according to the first distance and the second distance.
Optionally, said determining said zero sequence component from said first distance and said second distance comprises:
selecting one phase of the three-phase electric signals as a phase signal to be calculated;
obtaining the first distance and the second distance corresponding to the phase to be calculated;
and determining the zero sequence component of the phase signal to be calculated according to the minimum value of the first distance and the second distance.
Optionally, the determining the zero sequence component of the phase signal to be calculated according to the minimum value of the first distance and the second distance includes:
when the per unit value of the phase signal to be calculated is greater than or equal to 0, directly superposing the zero sequence component into the SPWM three-phase modulation wave;
and when the per unit value of the phase signal to be calculated is smaller than 0, adding 1 to the value of the zero sequence component, and then superposing the zero sequence component in the SPWM three-phase modulation wave.
Optionally, the sampling the SPWM three-phase modulated wave, and obtaining a first sampling result includes:
sampling the SPWM three-phase modulation wave to obtain three-phase sampling data;
and carrying out coordinate system transformation on the three-phase sampling data to obtain the first sampling result, wherein the first sampling result is represented by a dq coordinate system.
Optionally, after the calculating the modulation ratio of the first sampling result, determining whether the modulation ratio is greater than or equal to a preset modulation ratio, the method further includes:
and when the modulation ratio is smaller than the preset modulation ratio, injecting a sine pulse width modulation driving signal into the three-phase inverter.
Optionally, when the modulation ratio is greater than or equal to the preset modulation ratio, overlapping a zero sequence component into the SPWM three-phase modulation wave to obtain a DPWMA three-phase modulation wave, further including:
sampling the DPWMA three-phase modulation wave to obtain a second sampling result;
calculating the modulation ratio of the second sampling result, and judging whether the modulation ratio of the second sampling result is larger than or equal to the preset modulation ratio;
and injecting a sine pulse width modulation driving signal into the three-phase inverter when the modulation ratio of the second sampling result is smaller than the preset modulation ratio.
Optionally, after the calculating the modulation ratio of the second sampling result, determining whether the modulation ratio of the second sampling result is greater than or equal to the preset modulation ratio further includes:
and when the modulation ratio of the second sampling result is greater than or equal to the preset modulation ratio, adding the zero sequence component into the SPWM three-phase modulation wave to obtain a DPWMA three-phase modulation wave.
Optionally, the value of the preset modulation ratio is 1.
In another aspect, the present invention further provides a hybrid switching modulation system, including a processor unit;
the processor unit is configured to implement the hybrid switching modulation method as described above.
Compared with the prior art, the hybrid switching modulation system has the same beneficial effects as the hybrid switching modulation method, and the description thereof is omitted.
Drawings
Fig. 1 is a flow chart of a hybrid switching modulation method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hybrid switching modulation method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart before step S400 of the hybrid switching modulation method according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of the hybrid switching modulation method according to the embodiment of the present invention after step S390 is refined;
fig. 5 is a schematic flow chart of the hybrid switching modulation method according to the embodiment of the present invention after step S400 is refined.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the invention is susceptible of embodiment in the drawings, it is to be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustration purposes only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by such devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.
As shown in fig. 1, a hybrid switching modulation method provided in an embodiment of the present invention includes:
step S100, SPWM three-phase modulation wave generated by sine pulse width modulation method is obtained.
SPWM (Sinusoidal PWM), a sinusoidal pulse width modulation method.
In one embodiment, SPWM is used to generate a modulated waveform with a small common mode voltage that avoids severe electromagnetic interference due to the high amplitude generated by the common mode voltage of the photovoltaic inverter. In this embodiment, the circuit includes a photovoltaic panel and a three-phase inverter, where the photovoltaic panel is configured to input a dc bus voltage to the three-phase inverter, and after the three-phase inverter obtains a PWM driving signal sent by the controller, the three-phase inverter performs corresponding PWM modulation according to the PWM driving signal to obtain three alternating currents with evenly separated phase angles, and the initial PWM driving signal is an SPWM driving signal. In the initial state, a-phase, b-phase, and c-phase sinusoidal modulation waves generated by SPWM modulation are obtained, respectively.
And step S200, sampling the SPWM three-phase modulation wave to obtain a first sampling result.
After the sinusoidal modulation in the initial state is obtained, the modulated sinusoidal wave is sampled, the sampling result is analyzed, and whether the current modulated electric signal has qualified voltage utilization rate can be known according to the sampling result.
Specifically, the first sampling result includes an a-phase sampling result, a b-phase sampling result and a c-phase sampling result, and the sampling results of the a, b and c phases are respectively analyzed to determine the voltage utilization rate of each phase of electric signal during modulation.
Step S300, calculating the modulation ratio of the first sampling result, and judging whether the modulation ratio is larger than or equal to a preset modulation ratio, wherein the modulation ratio is the ratio of the spatial reference voltage vector amplitude to the direct current bus voltage.
Optionally, the preset modulation ratio is 1.
In an embodiment, the ratio of the vector magnitude of the spatial reference voltage to the voltage of the direct current bus (i.e. the output voltage of the photovoltaic panel to the three-phase inverter) is selected as the modulation ratio, so that the actual situation of the sampling moment can be determined, and the specific modulation means can be determined according to the actual situation.
And step S400, when the modulation ratio is greater than or equal to the preset modulation ratio, overlapping zero sequence components in the SPWM three-phase modulation wave to obtain the DPWMA three-phase modulation wave.
When the modulation ratio is greater than or equal to a preset modulation ratio, that is, the modulation ratio is too large, it is indicated that the utilization ratio of the direct current bus voltage is lower at the modulation moment, and the utilization ratio of the voltage needs to be improved on the basis of SPWM (sinusoidal pulse width modulation), that is, the zero sequence component is overlapped in SPWM three-phase modulation waves, so that the voltage utilization ratio is improved through DPWMA (pulse width modulation).
Optionally, after the calculating the modulation ratio of the first sampling result, determining whether the modulation ratio is greater than or equal to a preset modulation ratio, the method further includes:
and when the modulation ratio is smaller than the preset modulation ratio, injecting a sine pulse width modulation driving signal into the three-phase inverter.
In an embodiment, when the modulation ratio is smaller than the preset modulation ratio, that is, the modulation ratio is too small, it is indicated that a larger common-mode voltage may occur at the modulation time, no matter what PWM driving signal is injected into the three-phase inverter at the modulation time, the PWM driving signal is changed into the SPWM driving signal, the common-mode voltage is suppressed as much as possible through the SPWM modulation, and the electromagnetic interference problem is prevented.
Optionally, as shown in fig. 2 and fig. 3, before the superimposing of the zero sequence component into the SPWM three-phase modulated wave when the modulation ratio is greater than or equal to the preset modulation ratio, the method further includes:
step S380, determining a first distance and a second distance between the per unit value of each phase electric signal in the three-phase electric signals and a modulating wave boundary according to the per unit value of the three-phase sine wave in the SPWM three-phase modulating wave, wherein 1, 0 and-1 are taken as the modulating wave boundary, and when the per unit value is between 0 and 1, the first distance is the distance between the per unit value and 1, and the second distance is the distance between the per unit value and 0; when the per unit value is between-1 and 0, the first distance is the distance between the per unit value and 0, and the second distance is the distance between the per unit value and-1;
step S390, determining the zero sequence component according to the first distance and the second distance.
In one embodiment, the SPWM three-phase modulated wave is represented as:
Figure SMS_1
，
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_2
sine waves respectively representing a phase, b phase and c phase, M representing modulation ratio, +.>
Figure SMS_3
The angular velocity is represented, and t is time.
The modulation ratio M is defined as the spatial reference voltage vector magnitude
Figure SMS_4
With DC bus voltage->
Figure SMS_5
Ratio of (2)A value, wherein the spatial reference voltage vector magnitude +.>
Figure SMS_6
Comprises->
Figure SMS_7
The a-phase reference voltage vector magnitude, the b-phase reference voltage vector magnitude, and the c-phase reference voltage vector magnitude are represented, respectively.
According to the principle of zero sequence component injection, the three-phase modulated wave of DPWMA is expressed as:
Figure SMS_8
，
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_9
representing the zero sequence component.
Taking the distance between the per unit value of the sine wave of the a phase, the b phase and the c phase and the boundary of the modulation wave as a first distance
Figure SMS_10
And a second distance
Figure SMS_11
Expressed as:
Figure SMS_12
，
Figure SMS_13
，
from a first distance
Figure SMS_16
And a second distance->
Figure SMS_18
It can be seen that when->
Figure SMS_21
When the first distance is greater than or equal to 0, the first distance is +.>
Figure SMS_15
Distance from boundary 1, when->
Figure SMS_17
When smaller than 0, the first distance is +.>
Figure SMS_22
Distance from boundary 0; when->
Figure SMS_23
When the distance is greater than or equal to 0, the second distance is
Figure SMS_14
Distance from boundary 0, when ∈>
Figure SMS_19
When smaller than 0, the second distance is +.>
Figure SMS_20
Distance from boundary-1.
Optionally, as shown in fig. 4, the determining the zero sequence component according to the first distance and the second distance includes:
step S391, selecting one phase of the three-phase electrical signals as a phase signal to be calculated;
step S392, obtaining the first distance and the second distance corresponding to the phase to be calculated;
in step S393, the zero sequence component of the phase signal to be calculated is determined according to the minimum value of the first distance and the second distance.
In one embodiment, the zero sequence component is expressed as:
Figure SMS_24
，
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_25
representing the absolute value of the first distance, +.>
Figure SMS_26
Representing the absolute value of the second distance.
Optionally, the determining the zero sequence component of the phase signal to be calculated according to the minimum value of the first distance and the second distance includes:
when the per unit value of the phase signal to be calculated is greater than or equal to 0, directly superposing the zero sequence component into the SPWM three-phase modulation wave;
and when the per unit value of the phase signal to be calculated is smaller than 0, adding 1 to the value of the zero sequence component, and then superposing the zero sequence component in the SPWM three-phase modulation wave.
In an embodiment, the superposition of zero sequence components can be expressed as:
Figure SMS_27
，
in one embodiment, the DPWMA modulation may be formed by superimposing zero sequence components on the basis of SPWM modulation, the SPWM modulation interval being [0,1 ]]The modulation interval after overlapping the zero sequence component can reach 0,
Figure SMS_28
]therefore, the voltage utilization rate can be improved by superposing the zero sequence component at the moment of low SPWM (sinusoidal pulse width modulation) voltage utilization rate, and the modulation process has low calculated amount and is suitable for any level inverter.
Optionally, the sampling the SPWM three-phase modulated wave, and obtaining a first sampling result includes:
sampling the SPWM three-phase modulation wave to obtain three-phase sampling data;
and carrying out coordinate system transformation on the three-phase sampling data to obtain the first sampling result, wherein the first sampling result is represented by a dq coordinate system.
In an embodiment, the SPWM three-phase modulated wave subjected to SPWM modulation is sampled, and in order to simplify the calculation and obtain a better modulation effect, the coordinate system of the modulated wave is transformed from the abc three-phase coordinate system into the dq coordinate system.
Optionally, as shown in fig. 5, when the modulation ratio is greater than or equal to the preset modulation ratio, a zero sequence component is superimposed on the SPWM three-phase modulated wave, to obtain a DPWMA three-phase modulated wave, and then the method further includes:
step S410, sampling the DPWMA three-phase modulated wave to obtain a second sampling result;
step S420, calculating the modulation ratio of the second sampling result, and judging whether the modulation ratio of the second sampling result is larger than or equal to the preset modulation ratio;
and step S430, injecting a sine pulse width modulation driving signal into the three-phase inverter when the modulation ratio of the second sampling result is smaller than the preset modulation ratio.
Optionally, the value of the preset modulation ratio is 1.
In an embodiment, after the zero-sequence component is superimposed on the SPWM modulated wave for the first time, resampling the superimposed DPWMA three-phase modulated wave to obtain a second sampling result, transforming the three-phase modulated wave in the second sampling result into a coordinate system, representing the three-phase modulated wave by a dq coordinate system, and redetermining the modulation ratio of the signal, and when the modulation ratio is still greater than 1, maintaining the injection of the DPWMA driving signal into the inverter, so that the zero-sequence component is continuously superimposed on the SPWM three-phase modulated wave.
In another embodiment, when the second sampling result shows that the modulation ratio is smaller than the preset modulation ratio, the voltage utilization rate is in a higher range, and at the moment, the SPWM driving signal is injected into the three-phase inverter, and the overlapping of the zero sequence components is stopped.
Another embodiment of the present invention provides a hybrid switching modulation system, including a processor unit;
the processor unit is configured to implement the hybrid switching modulation method as described above.
An electronic device provided in another embodiment of the present invention includes a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the hybrid handover modulation method as described above when executing the computer program.
A further embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a hybrid handover modulation method as described above.
An electronic device that can be a server or a client of the present invention will now be described, which is an example of a hardware device that can be applied to aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
The electronic device includes a computing unit that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) or a computer program loaded from a storage unit into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the device may also be stored. The computing unit, ROM and RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like. In this application, the units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. A hybrid switching modulation method, comprising:
obtaining SPWM three-phase modulation waves generated by a sinusoidal pulse width modulation method;
sampling the SPWM three-phase modulation wave to obtain a first sampling result;
calculating a modulation ratio of the first sampling result, and judging whether the modulation ratio is larger than or equal to a preset modulation ratio, wherein the modulation ratio is a ratio of a spatial reference voltage vector amplitude to a direct current bus voltage;
and when the modulation ratio is greater than or equal to the preset modulation ratio, overlapping zero sequence components into the SPWM three-phase modulation wave to obtain the DPWMA three-phase modulation wave.
2. The hybrid switching modulation method according to claim 1, wherein, before the superimposing of the zero sequence component into the SPWM three-phase modulated wave when the modulation ratio is greater than or equal to the preset modulation ratio, further comprising:
determining a first distance and a second distance between each per unit value of each phase of electric signals in the three-phase electric signals and a modulating wave boundary according to the per unit value of the SPWM three-phase modulating wave, wherein 1, 0 and-1 are taken as the modulating wave boundary, when the per unit value is between 0 and 1, the first distance is the distance between the per unit value and 1, and the second distance is the distance between the per unit value and 0; when the per unit value is between-1 and 0, the first distance is the distance between the per unit value and 0, and the second distance is the distance between the per unit value and-1;
and determining the zero sequence component according to the first distance and the second distance.
3. The hybrid switching modulation method of claim 2 wherein said determining said zero sequence component from said first distance and said second distance comprises:
selecting one phase of the three-phase electric signals as a phase signal to be calculated;
obtaining the first distance and the second distance corresponding to the phase to be calculated;
and determining the zero sequence component of the phase signal to be calculated according to the minimum value of the first distance and the second distance.
4. A hybrid switching modulation method according to claim 3 wherein said determining said zero sequence component of said phase signal to be calculated from the minimum of said first distance and said second distance comprises:
when the per unit value of the phase signal to be calculated is greater than or equal to 0, directly superposing the zero sequence component into the SPWM three-phase modulation wave;
and when the per unit value of the phase signal to be calculated is smaller than 0, adding 1 to the value of the zero sequence component, and then superposing the zero sequence component in the SPWM three-phase modulation wave.
5. The hybrid switching modulation method of claim 1, wherein the sampling the SPWM three-phase modulated wave to obtain a first sampling result comprises:
sampling the SPWM three-phase modulation wave to obtain three-phase sampling data;
and carrying out coordinate system transformation on the three-phase sampling data to obtain the first sampling result, wherein the first sampling result is represented by a dq coordinate system.
6. The hybrid switching modulation method according to claim 1, wherein after said calculating the modulation ratio of the first sampling result, determining whether the modulation ratio is greater than or equal to a preset modulation ratio, further comprises:
and when the modulation ratio is smaller than the preset modulation ratio, injecting a sine pulse width modulation driving signal into the three-phase inverter.
7. The hybrid switching modulation method according to claim 1, wherein when the modulation ratio is greater than or equal to the preset modulation ratio, after superimposing a zero-sequence component into the SPWM three-phase modulation wave to obtain a DPWMA three-phase modulation wave, further comprising:
sampling the DPWMA three-phase modulation wave to obtain a second sampling result;
calculating the modulation ratio of the second sampling result, and judging whether the modulation ratio of the second sampling result is larger than or equal to the preset modulation ratio;
and injecting a sine pulse width modulation driving signal into the three-phase inverter when the modulation ratio of the second sampling result is smaller than the preset modulation ratio.
8. The hybrid switching modulation method according to claim 7, wherein after said calculating the modulation ratio of the second sampling result, determining whether the modulation ratio of the second sampling result is greater than or equal to the preset modulation ratio, further comprises:
and when the modulation ratio of the second sampling result is greater than or equal to the preset modulation ratio, adding the zero sequence component into the SPWM three-phase modulation wave to obtain a DPWMA three-phase modulation wave.
9. The hybrid switching modulation method of claim 1, wherein the preset modulation ratio has a value of 1.
10. A hybrid switching modulation system comprising a processor unit;
the processor unit is configured to implement the hybrid handover modulation method according to any one of claims 1-9.
CN202310249412.8A 2023-03-15 2023-03-15 Mixed switching modulation method and system Pending CN116317659A (en)

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CN117491721A (en) * 2023-12-28 2024-02-02 锦浪科技股份有限公司 Zero sequence voltage control method and device, electronic equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117491721A (en) * 2023-12-28 2024-02-02 锦浪科技股份有限公司 Zero sequence voltage control method and device, electronic equipment and storage medium
CN117491721B (en) * 2023-12-28 2024-05-14 锦浪科技股份有限公司 Zero sequence voltage control method and device, electronic equipment and storage medium

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