CN108173420A - A kind of minimum current harmonic wave PWM implementation methods - Google Patents
A kind of minimum current harmonic wave PWM implementation methods Download PDFInfo
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- CN108173420A CN108173420A CN201810087008.4A CN201810087008A CN108173420A CN 108173420 A CN108173420 A CN 108173420A CN 201810087008 A CN201810087008 A CN 201810087008A CN 108173420 A CN108173420 A CN 108173420A
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- harmonic
- harmonic wave
- cycle
- minimum current
- implementation methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—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
- H02M7/501—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 sinusoidal output voltages being obtained by the combination of several pulse-voltages having different amplitude and width
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention and PWM inverter technical field, specially a kind of minimum current harmonic wave PWM implementation methods, realization is simple and convenient, and at low cost its includes the following steps：（1）Establish primary modulation waveform；（2）The a cycle of selected primary modulation waveform, is divided into three points of periods by the period, the period is each divided to correspond to a cycle of triple-frequency harmonics, establish third-harmonic zero-sequence voltage table；（3）The angle of triple-frequency harmonics to be measured is extracted, according to step（2）Middle third-harmonic zero-sequence voltage table, inquiry obtain corresponding harmonic injection value；（4）Calculate harmonic injection depth；（5）Calculate total harmonic injection value.
Description
Technical field
The present invention and PWM inverter technical field, specially a kind of minimum current harmonic wave PWM implementation methods.
Background technology
Voltage Source PWM Inverter is when realizing power conversion, it is common to use SPWM SVPWM modulation technologies, this
The realization principle of a little modulator approaches is all to utilize the rectangular pulse by the amplitudes pulse width such as N number of not grade come equivalent sine wave, such as
Shown in Fig. 1.Abundant higher hamonic wave is rich in equivalent voltage, these harmonic waves are acted on the winding of motor, to motor
Electric current has an impact, and the electric current of motor is caused to generate harmonic wave.
It is the characteristics of motor three-phase is without neutral system according to its load in numerous PWM solutions, SVPWM has complete
The characteristics of office is optimal, has obtained generally using, but current harmonics is not optimal.But in certain specific applied fields
It closes, needs to take the control strategy of minimum current harmonic wave, and the control strategy of minimum current harmonic wave is employed on the basis of SPWM
The scheme of 1/4 triple-frequency harmonics is superimposed, generally has two kinds of hardware approach and software approach in existing implementation：
Hardware approach is realized using FPGA programming devices, generates triangular wave carrier signal, generates sinusoidal Setting signal, according to
Setting signal, which generates, enters harmonic oscillator, and harmonic oscillator generates harmonic signal and is added with Setting signal, obtains modulated signal,
Modulated signal is compared generation PWM drive signal with triangle carrier signal.Program implementation method is more flexible, but cost
Height needs the device on FPGA peripheries to coordinate.
Software approach is according to harmonic injection formula, carries out off-line calculation, and offline form is stored into the storage list of CPU
Member, output as needed table look-up and obtain modulated signal, and more modulated signal relatively obtains PWM modulation waveform with inner triangular Bobbi,
The realization of the program needs to occupy a large amount of CPU storage units, and flexibility ratio is poor.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of minimum current harmonic wave PWM implementation methods, realize simple side
Just, it is at low cost.
Its technical solution is such：A kind of minimum current harmonic wave PWM implementation methods, which is characterized in that including following step
Suddenly：
（1）Establish primary modulation waveform；
（2）The a cycle of selected primary modulation waveform, three points of periods are divided by the period, and the period is each divided to correspond to three times
The a cycle of harmonic wave establishes third-harmonic zero-sequence voltage table；
（3）The angle of triple-frequency harmonics to be measured is extracted, according to step（2）Middle third-harmonic zero-sequence voltage table, inquiry obtain corresponding harmonic wave
Injection value；
（4）Calculate harmonic injection depth；
（5）Calculate total harmonic injection value.
After scheme using the present invention, on the basis of SPWM realizations, third-harmonic zero-sequence voltage table is established, according to current
The angle and modulation depth of SPWM can obtain current harmonic injection amount by tabling look-up offline, implement it is simple and convenient, into
This is low.
Description of the drawings
Fig. 1 realizes flow diagram for the present invention；
Fig. 2 is sector division schematic diagram.
Specific embodiment
As shown in Figure 1, a kind of minimum current harmonic wave PWM implementation methods, include the following steps：
（1）Establish primary modulation waveform；
（2）The a cycle of selected primary modulation waveform, three points of periods are divided by the period, and the period is each divided to correspond to three times
The a cycle of harmonic wave establishes third-harmonic zero-sequence voltage table；
（3）The angle of triple-frequency harmonics to be measured is extracted, according to step（2）Middle third-harmonic zero-sequence voltage table, inquiry obtain corresponding harmonic wave
Injection value；
（4）Calculate harmonic injection depth；
（5）Calculate total harmonic injection value.
Concrete example illustrates below, by taking 90kW frequency converters band 90kW asynchronous machines as an example,
If first harmonic be f (t)=cos (wt+a), triple-frequency harmonics formula be cos (3wt+a), one of primary modulation waveform
Electrical cycle is only equivalent to 3 electrical cycles of triple-frequency harmonics, therefore π i.e. one electrical cycle of a corresponding triple-frequency harmonics, will
The modulation waveform value of a electrical cycle becomes the harmonic wave of the harmonic injection value of a new electrical cycle, i.e. ten half π of original
It is the harmonic injection of new π that injection value, which is the harmonic injection value of new π, the harmonic injection value of 1/9th π of original,
Value ..., and so on, a third-harmonic zero-sequence voltage table is obtained, corresponding harmonic injection table is inquired according to the angle of harmonic wave to be measured
.The electrical cycle of this side corresponds to the sector in Figure of description, as shown in Figure 2.
Output current THDI values are observed by 10-50Hz different frequency sections
| Output frequency Hz | 10 | 20 | 30 | 40 | 50 |
| Originally motor output THDI | 12.2% | 9.1% | 6.5% | 5.2% | 4.8% |
| Add in the THDI of sector value | 7.2% | 6.3% | 4.3% | 3.2% | 2.1% |
Claims (1)
1. a kind of minimum current harmonic wave PWM implementation methods, which is characterized in that include the following steps：
（1）Establish primary modulation waveform；
（2）The a cycle of selected primary modulation waveform, three points of periods are divided by the period, and the period is each divided to correspond to three times
The a cycle of harmonic wave establishes third-harmonic zero-sequence voltage table；
（3）The angle of triple-frequency harmonics to be measured is extracted, according to step（2）Middle third-harmonic zero-sequence voltage table, inquiry obtain corresponding harmonic wave
Injection value；
（4）Calculate harmonic injection depth；
（5）Calculate total harmonic injection value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087008.4A CN108173420A (en) | 2018-01-30 | 2018-01-30 | A kind of minimum current harmonic wave PWM implementation methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087008.4A CN108173420A (en) | 2018-01-30 | 2018-01-30 | A kind of minimum current harmonic wave PWM implementation methods |
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| Publication Number | Publication Date |
|---|---|
| CN108173420A true CN108173420A (en) | 2018-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810087008.4A Pending CN108173420A (en) | 2018-01-30 | 2018-01-30 | A kind of minimum current harmonic wave PWM implementation methods |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654181A (en) * | 2020-06-22 | 2020-09-11 | 中国联合网络通信集团有限公司 | A converter control method and device |
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| CN102577076A (en) * | 2009-10-02 | 2012-07-11 | 通用电气公司 | Electronic device control system and method |
| CN102723889A (en) * | 2012-07-03 | 2012-10-10 | 华为技术有限公司 | Inverter and pulse width modulation (PWM) method thereof |
| CN104639009A (en) * | 2013-11-11 | 2015-05-20 | 北京动力源科技股份有限公司 | Vector control frequency converter and control method and device thereof |
| CN104716648A (en) * | 2015-04-01 | 2015-06-17 | 华北电力科学研究院有限责任公司 | Modeling method of alternating current and direct current electric locomotive |
| JP5892955B2 (en) * | 2013-01-24 | 2016-03-23 | 三菱電機株式会社 | Power converter |
| CN105846697A (en) * | 2016-05-05 | 2016-08-10 | 苏州汇川技术有限公司 | PWM rectification control method under low switching frequency and PWM rectification control system thereof |
| CN106324342A (en) * | 2016-08-22 | 2017-01-11 | 江苏南自通华电力自动化股份有限公司 | Harmonic wave detecting method based on table look-up |
-
2018
- 2018-01-30 CN CN201810087008.4A patent/CN108173420A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102577076A (en) * | 2009-10-02 | 2012-07-11 | 通用电气公司 | Electronic device control system and method |
| CN102723889A (en) * | 2012-07-03 | 2012-10-10 | 华为技术有限公司 | Inverter and pulse width modulation (PWM) method thereof |
| JP5892955B2 (en) * | 2013-01-24 | 2016-03-23 | 三菱電機株式会社 | Power converter |
| CN104639009A (en) * | 2013-11-11 | 2015-05-20 | 北京动力源科技股份有限公司 | Vector control frequency converter and control method and device thereof |
| CN104716648A (en) * | 2015-04-01 | 2015-06-17 | 华北电力科学研究院有限责任公司 | Modeling method of alternating current and direct current electric locomotive |
| CN105846697A (en) * | 2016-05-05 | 2016-08-10 | 苏州汇川技术有限公司 | PWM rectification control method under low switching frequency and PWM rectification control system thereof |
| CN106324342A (en) * | 2016-08-22 | 2017-01-11 | 江苏南自通华电力自动化股份有限公司 | Harmonic wave detecting method based on table look-up |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654181A (en) * | 2020-06-22 | 2020-09-11 | 中国联合网络通信集团有限公司 | A converter control method and device |
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