CN114257114A - Three-level converter control method and system based on carrier phase shift modulation - Google Patents
Three-level converter control method and system based on carrier phase shift modulation Download PDFInfo
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- CN114257114A CN114257114A CN202111513043.6A CN202111513043A CN114257114A CN 114257114 A CN114257114 A CN 114257114A CN 202111513043 A CN202111513043 A CN 202111513043A CN 114257114 A CN114257114 A CN 114257114A
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- 230000010363 phase shift Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 239000000969 carrier Substances 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a carrier phase shift modulation-based three-level converter control method, which comprises the steps of firstly generating two groups of carrier waves and three groups of modulation waves, wherein the phase difference between the two groups of carrier waves is 90 degrees, the phase difference between the three groups of modulation waves is 120 degrees, then comparing the carrier waves with the modulation waves, and generating pulse width modulation waves of each semiconductor switch device of a converter, so that the harmonic frequency and amplitude of the output line voltage of the converter are both positioned between a same-phase carrier wave and a reverse-phase carrier wave. The invention is beneficial to reducing the size of the filter and the complexity of the filter.
Description
Technical Field
The invention relates to an inverter control technology, in particular to a three-level converter control method and a system based on carrier phase shift modulation.
Background
The three-level converter has the advantages of small output harmonic, high output voltage, high reliability and the like, and is widely applied to the fields of new energy power generation, electric transmission, rail transit traction converter systems and the like.
Common modulation technologies of the three-level converter include a carrier modulation technology and a space vector modulation technology, and the carrier modulation is easy to implement and widely applied to a three-level converter system. The traditional three-level converter carrier phase-shifting modulation method has the modes of in-phase carrier and reverse carrier, the converter line voltage harmonic wave based on the in-phase carrier mode is mainly distributed in the carrier side frequency band, the harmonic amplitude is small, the harmonic frequency band is wide, the converter line voltage harmonic wave based on the reverse carrier mode is mainly distributed in the carrier frequency multiplication, the harmonic amplitude is large, and the harmonic frequency band is narrow. Regarding the modulation mode, a patent 'a carrier laminating phase-shifting control method of a three-phase three-level inverter circuit' is taken as a representative example, the control method can realize three-level reverse carrier debugging, but the method does not carry out phase shifting on carriers, line voltage harmonic waves are mainly concentrated on carrier frequency multiplication, the harmonic amplitude is large, the design difficulty of a filter is large, and the size is large.
Disclosure of Invention
The invention aims to provide a three-level converter control method and a system based on carrier phase shift modulation.
The technical solution for realizing the purpose of the invention is as follows: a carrier phase shift modulation-based three-level converter control method comprises the steps of firstly generating two groups of carrier waves and three groups of modulation waves, wherein the phase difference between the two groups of carrier waves is 90 degrees, the phase difference between the three groups of modulation waves is 120 degrees, then comparing the carrier waves with the modulation waves, and generating pulse width modulation waves of each semiconductor switch device of a converter, so that the harmonic frequency and amplitude of the output line voltage of the converter are both positioned between a same-phase carrier wave and a reverse-phase carrier wave.
Further, the carrier wave form is a rectangular carrier wave or a triangular carrier wave.
Further, the modulation waveform is in a sine wave form or a waveform added with a zero sequence component.
Further, two groups of carriers are respectively an upper carrier _ up and a lower carrier _ down, three groups of modulation waves are respectively Ua, Ub and Uc, and correspond to a, b and c three phases of the converter, the carriers and the modulation waves are compared to generate a pulse width modulation wave of each semiconductor switching device of the converter, and the specific method is as follows:
(1) comparing the a-phase modulation wave with the carrier, and if Ua is not less than Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is 1; if Ua is less than Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is equal to 0; if Ua is less than or equal to Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 1; if Ua is more than Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 0;
(2) generating a trigger pulse signal of a-phase T3 tube and a switch T4 tube switch device:
PWM_A3＝！PWM_A1；
PWM_A4＝！PWM_A2；
(3) in the same manner, switching device trigger pulse signals of the B phase and the C phase are obtained.
A carrier phase shift modulation based three-level converter control system is based on the carrier phase shift modulation based three-level converter control method, and carrier phase shift modulation based three-level converter control is achieved.
A computer device comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, when the processor executes the computer program, the three-level converter control based on the carrier phase shift modulation is realized based on the control method of the three-level converter based on the carrier phase shift modulation.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements a three-level converter control based on carrier phase shift modulation based on the method for controlling a three-level converter based on carrier phase shift modulation.
Compared with the prior art, the invention has the following remarkable advantages: the voltage harmonic frequency and amplitude of the converter output line are both between the in-phase carrier and the reverse-phase carrier, so that the size of the filter is reduced, and the complexity of the filter is reduced.
Drawings
FIG. 1 is a diagram of a comparison mode of a three-level converter control method based on carrier phase shift modulation;
FIG. 2 is a waveform diagram of phase voltage and line voltage of a three-level converter based on carrier phase shift modulation;
fig. 3 is a schematic diagram of a-phase switching tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The invention relates to a control method of a three-level converter based on carrier phase shift modulation, which comprises the steps of firstly defining a carrier wave and a modulation wave of double-carrier pulse width modulation, for the three-level converter with three-phase output, the phases of three-phase voltage reference values are respectively 120 degrees different, the phase difference of two carrier waves is 90 degrees, then determining a comparison mode, comparing the three-phase voltage reference values with the two carrier waves, and generating a pulse width modulation wave of each semiconductor switching device of the converter, so that the voltage harmonic frequency and the amplitude of the output line of the converter are both positioned between an in-phase carrier wave and a reverse-phase carrier wave, thereby being beneficial to reducing the size of a filter and reducing the complexity of the filter.
As a specific embodiment, the carrier may be a rectangular carrier or a triangular carrier. The modulation wave may be a sine wave or a wave with zero sequence components added.
As a specific embodiment, two sets of carriers are an upper carrier _ up and a lower carrier Ucarry _ down, respectively, three sets of modulated waves are Ua, Ub and Uc, respectively, and correspond to three phases a, b and c of the converter, and the modulated wave and carrier comparison method is as follows:
if Ua is larger than or equal to Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is 1;
if Ua is less than Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is equal to 0;
if Ua is less than or equal to Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 1;
if Ua is more than Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 0;
accordingly, switching device trigger pulse signals of a-phase T3 tube and a-phase T4 tube can be generated:
PWM_A3＝！PWM_A1；
PWM_A4＝！PWM_A2；
in the same manner, switching device trigger pulse signals of the B phase and the C phase can be obtained.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A three-level converter control method based on carrier phase shift modulation is characterized in that two groups of carriers and three groups of modulation waves are generated, the phase difference between the two groups of carriers is 90 degrees, the phase difference between the three groups of modulation waves is 120, then the carriers and the modulation waves are compared to generate pulse width modulation waves of each semiconductor switching device of a converter, and the frequency and amplitude of voltage harmonics of an output line of the converter are located between a same-phase carrier and a reverse-phase carrier.
2. The control method of the three-level converter based on the carrier phase shift modulation of claim 1, wherein the carrier is in the form of a rectangular carrier or a triangular carrier.
3. The control method of the three-level converter based on the carrier phase shift modulation as claimed in claim 1, wherein the modulation waveform is a sine wave or a waveform added with a zero-sequence component.
4. The control method of the three-level converter based on the carrier phase shift modulation as claimed in claim 1, wherein two groups of carriers are Uary _ up and Uary _ down, respectively, three groups of modulated waves are Ua, Ub and Uc, respectively, and correspond to three phases a, b and c of the converter, and the carrier waves and the modulated waves are compared to generate the pulse width modulated waves of each semiconductor switch device of the converter, and the specific method is as follows:
(1) comparing the a-phase modulation wave with the carrier, and if Ua is not less than Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is 1; if Ua is less than Ucarry _ up, triggering pulse PWM _ A1 of a-phase T1 tube switching device is equal to 0; if Ua is less than or equal to Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 1; if Ua is more than Ucarry _ down, triggering pulse PWM _ A2 of a-phase T2 tube switching device is 0;
(2) generating a trigger pulse signal of a-phase T3 tube and a switch T4 tube switch device:
PWM_A3＝！PWM_A1；
PWM_A4＝！PWM_A2；
(3) in the same manner, switching device trigger pulse signals of the B phase and the C phase are obtained.
5. A three-level converter control system based on carrier phase shift modulation is characterized in that the three-level converter control based on carrier phase shift modulation is realized based on the three-level converter control method based on carrier phase shift modulation of any one of claims 1 to 4.
6. Computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a carrier phase shift modulation based three-level converter control based on the method for carrier phase shift modulation based three-level converter control according to any of claims 1-4 when executing the computer program.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements a three-level converter control based on carrier phase shift modulation, based on the carrier phase shift modulation based three-level converter control method of any one of claims 1 to 4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116962128A (en) * | 2023-09-21 | 2023-10-27 | 北京全路通信信号研究设计院集团有限公司 | Method, device, equipment and storage medium for analyzing frequency shift signal |
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