CN103490652B - Phase-shifting carrier wave pulse duration modulation method - Google Patents
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Abstract
The invention discloses phase-shifting carrier wave pulse duration modulation method, from adjustment triangular carrier phase place, a kind of phase-shifting carrier wave pulse duration modulation method is proposed, in PWM running, conventional P WM basis does not change computational process, computational methods and Compare Logic, only phase place change is periodically occurred to triangular carrier, every one of the odd number of points cycle of half primitive period or half primitive period, controller is by the odd-multiple of the phase place phase shift 180 ° of triangular carrier, the even-order harmonic in PWM waveform can be eliminated theoretically, institute of the present invention extracting method is applied widely, without complicated calculations, be easy to realize, both be applicable to single-phase application and be also applicable to heterogeneous application, both be applicable to SPWM and be also applicable to other interchange PWM mode such as SVPWM, be suitable for engineering to promote.
Description
Technical field
The present invention relates to phase-shifting carrier wave pulse duration modulation method, be applicable to various types of interchange output pulse width modulation technique, the even-order harmonic in pulse-width modulation result can be made greatly to reduce.
Background technology
Along with power semiconductor device, especially the developing rapidly of IGBT, the application of power electronic equipment is increasingly extensive, particularly in the occasion of ac-dc conversion.In AC system, electrical network or motor all need the harm doing one's utmost to avoid harmonic wave to cause, and reducing or eliminating harmonic wave from principle is the effective technical way solving harmonic pollution problems.In current ac-dc conversion device, under full-control type power semiconductor device is usually operated at switching mode, adopting PWM(pulse width modulation, be called for short pulse-width modulation) mode is way the most general.The general principle of PWM carrys out equivalent sine waveform with the impulse wave that amplitude is equal, and the turning on and off of magnitude relationship control device of usual carrier wave and comparison value in implementation, obtains the modulation waveform needed.Carrier wave is the triangular wave that frequency is higher, for the ease of controlling, and keeping the symmetry of the positive and negative half-wave of modulation result, the integral multiple of modulating wave half-wave (half first-harmonic) cycle normally carrier cycle, the converter plant such as, used under 50Hz AC system often adopts the carrier frequencies such as 2kHz, 4kHz.
DC/AC conversion is widely used, and may be used for single phase system, three-phase system and other specific occasions, conventional PWM mode has Sine Pulse Width Modulation, space vector pulse width modulation SVPWM etc.Conventional PWM mode has a common feature: in two moment of half-wave symmetry, and it is just complementary for the comparison value calculating full control devices switch.As shown in Figure 1, the comparison value of A place and B place correspondence is complementary, compare with triangular carrier and produce PWM waveform, in A moment corresponding carrier cycle positive pulse width carrier cycle corresponding to the B moment in the width of negative pulse equal, but both PWM waveforms are not full symmetric.From the principle of mathematics Fourier decomposition, containing even-order harmonic component in PWM waveform.
Suppress about the even-order harmonic exchanging PWM, current visible technology all based on Bin Wu(Canada) doctor propose a kind of method, its particular content can with reference to " High-Power Converters and AC Drives " (New Jersey:IEEE Press, Wiley-Interscience, 2006. WU Bin), but the method is only applicable to SVPWM.There is no a kind of method of general solution problems at present.
Summary of the invention
The object of the present invention is to provide a kind of general, that even-order harmonic can be suppressed new PWM method.Then the method carries out PWM by phase-shifting carrier wave, and the even-order harmonic that can be used for all kinds of single-phase and heterogeneous PWM suppresses, and method is easy to realize, and the scope of application is very wide.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions: phase-shifting carrier wave pulse duration modulation method, is characterized in that, comprises the following steps:
1) within each triangular carrier cycle, first controller obtains the comparison value of modulating wave: described triangular carrier is isosceles triangle wave;
2) every one of the odd number of points cycle of half primitive period or half primitive period, controller is by the odd-multiple of the phase place phase shift 180 ° of triangular carrier;
3) controller carries out logic to triangular carrier and comparison value and compares: when triangular carrier is more than or equal to comparison value, and controller exports " 1 ", and when triangular carrier is less than comparison value, controller exports " 0 ";
4) the PWM waveform not containing even-order harmonic is obtained.
The present invention is from adjustment triangular carrier phase place, propose a kind of phase-shifting carrier wave pulse duration modulation method, in PWM running, triangular carrier is not always invariable, but periodically there is phase place change, and the carrier wave of disclosed PWM method all keeps constant at present; Making the final waveform half-wave symmetry exported by changing triangular carrier phase place, meeting the feature of odd harmonic function, according to the mathematical principle of Fourier analysis, not containing even-order harmonic in this waveform, the even-order harmonic in PWM waveform can be eliminated theoretically; Institute of the present invention extracting method is applied widely, without complicated calculations, is easy to realization, is both applicable to single-phase application and is also applicable to heterogeneous application, is both applicable to SPWM and is also applicable to other interchange PWM mode such as SVPWM, is suitable for engineering and promotes.
The invention has the beneficial effects as follows: the present invention is optimized adjustment to triangular carrier, conventional P WM basis does not change computational process, computational methods and Compare Logic, only periodic modulation is carried out to triangle carrier signal phase place, even-order harmonic can be realized and suppress.The method is easy to realize, and the scope of application is very wide, and the occasion such as single-phase or heterogeneous, SPWM or SVPWM, two level or many level for AC applications is all applicable.
Accompanying drawing explanation
Fig. 1 is the present invention's half primitive period symmetrical moment conventional P WM waveform schematic diagram;
Fig. 2 is that controller of the present invention is by direct for triangular carrier phase shift schematic diagram;
Fig. 3 is the present invention's half primitive period symmetrical moment phase-shifting carrier wave PWM waveform schematic diagram;
Fig. 4 is three-phase SPPWM implementation result schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, adopt conventional P WM method, the comparison value of A place and B place correspondence is complementary, compare with triangular carrier and produce PWM waveform, in the corresponding triangular carrier cycle in A moment positive pulse the width triangular carrier cycle corresponding to the B moment in the width of negative pulse equal, but both PWM waveforms are not full symmetric, from the principle of mathematics Fourier decomposition, containing even-order harmonic component in PWM waveform.
Phase-shifting carrier wave pulse duration modulation method of the present invention, adjustment is optimized to triangular carrier, conventional P WM basis does not change computational process, computational methods and Compare Logic, only periodic modulation is carried out to triangle carrier signal phase place, even-order harmonic can be realized suppress, specifically comprise the following steps:
1) within each triangular carrier cycle, first controller obtains the comparison value of modulating wave: described triangular carrier is isosceles triangle wave.Wherein the generation of comparison value is the same with traditional PWM method, and the comparison value of such as SPWM is the sinusoidal modulation wave that controller produces according to control objectives, and the comparison value of SVPWM is that controller is judged by sector and Vector operation obtains.
2) every one of the odd number of points cycle of half primitive period or half primitive period, such as 1/3 half primitive period, controller is by the odd-multiple of the phase place phase shift 180 ° of triangular carrier: described first-harmonic is the first-harmonic that PWM ripple is corresponding, and its frequency is the integral multiple of frequency of modulated wave.Wherein the mode of phase shift is not limit, preferred controller directly by triangular carrier phase shift 180 °, as shown in Figure 2, before phase shift, when each triangular carrier cycle starts, triangular carrier is in the trough of triangular wave, and after phase shift, when each triangular carrier cycle starts, triangular carrier is in the crest of triangular wave.
3) controller carries out logic to triangular carrier and comparison value and compares: when triangular carrier is more than or equal to comparison value, and controller exports " 1 ", and when triangular carrier is less than comparison value, controller exports " 0 "; Wherein Compare Logic can be positive logic also can be negative logic.
4) the PWM waveform not containing even-order harmonic is obtained.
Employing this method gets A, B moment in Fig. 1 equally, and after adopting phase-shifting carrier wave PWM method, corresponding PWM waveform as shown in Figure 3, can obviously be found out, the complete Symmetrical of PWM waveform that A, B moment is corresponding geometrical relationship.According to the Fourier decomposition law of half-wave symmetry function, not containing even-order harmonic in PWM waveform.
Below to be applied as example in Three-phase SPWM, be called for short SPPWM.
As shown in Figure 4, A, B, C three-phase delayed 120 ° successively, every A phase zero-acrross ing moment, controller carries out a phase shift to triangular carrier to three-phase symmetrical Sine Modulated waveform, phase shifts 180 °, adopts direct phase shift system as shown in Figure 2.In the Stochastic choice t1 moment, controller compares to corresponding triangular carrier cycle internal modulation ripple the PWM waveform obtained with triangular carrier, as shown in Fig. 4 lower left, and the method that wherein SPWM waveform is corresponding traditional, the corresponding method of the present invention of SPPWM.For three-phase system, external behavior is mainly manifested in alternate, therefore gives the PWM waveform that AC is alternate, subtracts C obtain by A.Select the moment t2 with t1 half-wave symmetry, both time intervals are T/2, and wherein T is the sinusoidal fundamental wave cycle.Adopt classical SPWM pulse modulation mode, the impulse waveform produced, as shown under Fig. 4, is found out from the alternate waveform of AC, the waveform area in the triangular carrier cycle and the complementation of t1 moment, but waveform is not full symmetric, because PWM waveform introduces even-order harmonic component.Adopt phase-shifting carrier wave pulse duration modulation method of the present invention, SPPWM is at triangular carrier phase 180 ° corresponding to t2 and t1 moment, as shown in Fig. 4 lower right, the alternate impulse waveform of AC that the t2 moment is corresponding and t1 moment full symmetric, effectively avoid the introducing of even-order harmonic.When the present invention is used for three-phase SVPWM, there is execution mode same as described above and implementation result.AC applications single-phase or heterogeneous, the occasion such as two level or many level is all applicable.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (3)
1. phase-shifting carrier wave pulse duration modulation method, is characterized in that, comprises the following steps:
1) within each triangular carrier cycle, first controller obtains the comparison value of modulating wave: described triangular carrier is isosceles triangle wave;
2) every one of the odd number of points cycle of half primitive period or half primitive period, controller is by the odd-multiple of the phase place phase shift 180 ° of triangular carrier;
3) controller carries out logic to triangular carrier and comparison value and compares: when triangular carrier is more than or equal to comparison value, and controller exports " 1 ", and when triangular carrier is less than comparison value, controller exports " 0 ";
4) the PWM waveform not containing even-order harmonic is obtained.
2. phase-shifting carrier wave pulse duration modulation method according to claim 1, is characterized in that, step 2) in, controller is directly by the phase place phase shift 180 ° of triangular carrier.
3. phase-shifting carrier wave pulse duration modulation method according to claim 1, is characterized in that, the step 3) in claim 1 is replaced with: controller carries out negative logic to triangular carrier and comparison value and compares.
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| CN104052320B (en) * | 2014-06-17 | 2017-02-22 | 华为技术有限公司 | PWM method and device |
| CN104184432B (en) * | 2014-08-20 | 2016-10-05 | 高玉琴 | A kind of phase-shift circuit |
| JP6579195B2 (en) * | 2015-09-30 | 2019-09-25 | 日産自動車株式会社 | Power control method and power control apparatus |
| CN109586554B (en) * | 2018-11-06 | 2020-08-25 | 中国人民解放军海军工程大学 | Multi-frequency-multiplication uniform carrier slope random distribution pulse width modulation method |
| CN112290779B (en) * | 2020-10-16 | 2021-09-28 | 臻驱科技（上海）有限公司 | Pulse width modulation method for temporarily changing carrier wave form |
| CN113777388B (en) * | 2021-09-10 | 2023-11-21 | 王强 | Method for measuring effective value of derivative of periodic signal |
| CN116545079B (en) * | 2023-07-07 | 2024-04-09 | 宁德时代新能源科技股份有限公司 | Modulation method, modulation device and storage medium of cascade energy storage system |
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