CN103490652A - Carrier phase-shifting pulse width modulation method - Google Patents
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Abstract
The invention discloses a carrier phase-shifting pulse width modulation method. The carrier phase-shifting pulse width modulation method is used for adjusting the phase of a triangular carrier. In the operation process of PWM, the computational process, a computational method and the comparison logic are not changed on the basis of traditional PWM, phase changes are periodically carried out on the triangular carrier, a controller carries out phase shifting with the odd number times of 180 degrees on the phase of triangular carrier at intervals of a half of a fundamental wave period or one of odd-number parts of a half of the fundamental wave period, and even harmonic in a PWM waveform can be eliminated theoretically. The carrier phase-shifting pulse width modulation method is wide in range of application, free of complex computation, easy to implement, suitable for both single-phase application and multi-phase application, suitable for PWM communication modes such as SPWM and SVPWM, and applicable to engineering popularization.
Description
Technical field
The present invention relates to the phase-shifting carrier wave pulse duration modulation method, be applicable to various types of interchange output pulse width modulation techniques, can make the even-order harmonic in the pulse-width modulation result greatly reduce.
Background technology
Along with power semiconductor device, developing rapidly of IGBT especially, 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 to do one's utmost the harm of avoiding harmonic wave to cause, and reducing or eliminating harmonic wave from principle is the effective technical way that solves the harmonic pollution problem.In current ac-dc conversion device, the full-control type power semiconductor device is usually operated under switching mode, adopts PWM(pulse width modulation, is called for short pulse-width modulation) mode is the most general way.The basic principle of PWM is that the impulse wave equal by amplitude carrys out the equivalent sine waveform, on implementation, usually with the turning on and off of the magnitude relationship control device of carrier wave and comparison value, obtains the modulation waveform of needs.Carrier wave is the triangular wave that frequency is higher, for the ease of controlling, and the symmetry of the positive and negative half-wave of maintenance modulation result, modulating wave half-wave (half first-harmonic) cycle is the integral multiple of carrier cycle normally, often adopts the carrier frequencies such as 2kHz, 4kHz such as the converter plant used under the 50Hz AC system.
The DC/AC conversion is widely used, can be for single phase system, three-phase system and other specific occasion, and PWM mode commonly used has Sine Pulse Width Modulation, space vector pulse width modulation SVPWM etc.PWM mode commonly used has a common feature: in two moment of half-wave symmetry, it is just complementary for the comparison value that calculates full control devices switch.As shown in Figure 1, the comparison value complementation that A place and B place are corresponding, relatively produce the PWM waveform with triangular carrier, the A width of the interior positive pulse of corresponding carrier cycle constantly equates with the width of negative pulse in B corresponding carrier cycle of the moment, but both PWM waveforms are not full symmetric.From the principle of mathematics Fourier decomposition, contain the even-order harmonic component in the PWM waveform.
About the even-order harmonic that exchanges PWM, suppress, current visible technology is all based on Bin Wu(Canada) a kind of method of proposing of doctor, its particular content can be 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 at present a kind of method of general solution problems.
Summary of the invention
The object of the present invention is to provide a kind of general, new PWM method that can suppress even-order harmonic.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: the phase-shifting carrier wave pulse duration modulation method, it is characterized in that, comprise the following steps:
1), at each triangular carrier in the cycle, at first controller is obtained the comparison value of modulating wave: described triangular carrier is isosceles triangle wave;
2) every one of the odd number of points of half primitive period or the half primitive period cycle, controller is by the odd-multiple of 180 ° of the phase place phase shifts of triangular carrier;
3) controller carries out logic relatively to triangular carrier and comparison value: when triangular carrier is more than or equal to comparison value, and controller output " 1 ", when triangular carrier is less than comparison value, controller output " 0 ";
4) obtain the PWM waveform that do not contain even-order harmonic.
The present invention is from adjusting the triangular carrier phase place, propose a kind of phase-shifting carrier wave pulse duration modulation method, in the PWM running, triangular carrier is not always invariable, but phase place periodically occurs, change, and that the carrier wave of current disclosed PWM method all keeps is constant; Make the waveform half-wave symmetry of final output by changing the triangular carrier phase place, meet the characteristics of odd harmonic function, according to the mathematical principle of Fourier analysis, in this waveform, not containing even-order harmonic, can eliminate theoretically the even-order harmonic in the PWM waveform; Institute of the present invention extracting method is applied widely, without complicated calculations, is easy to realization, both is applicable to single-phase application and also is applicable to heterogeneous application, both is applicable to SPWM and also is applicable to other interchanges PWM modes 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, on conventional P WM basis, does not change computational process, computational methods and Compare Logic, only the triangular carrier signal phase is carried out to periodic modulation, can realize that even-order harmonic suppresses.The method is easy to realize, the scope of application is very wide, all applicable for single-phase or heterogeneous, SPWM or the occasions such as SVPWM, two level or many level of AC applications.
The accompanying drawing explanation
Fig. 1 is half symmetrical conventional P WM constantly of primitive period waveform schematic diagram of the present invention;
Fig. 2 is that controller of the present invention is by the direct phase shift schematic diagram of triangular carrier;
Fig. 3 is half symmetrical phase-shifting carrier wave PWM constantly of primitive period waveform schematic diagram of the present invention;
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 be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, adopt conventional P WM method, the comparison value complementation that A place and B place are corresponding, relatively produce the PWM waveform with triangular carrier, the width of A positive pulse in the corresponding triangular carrier cycle constantly equates with the width of B interior negative pulse of corresponding triangular carrier cycle in the moment, but both PWM waveforms are not full symmetric, from the principle of mathematics Fourier decomposition, contain the even-order harmonic component in the PWM waveform.
Phase-shifting carrier wave pulse duration modulation method of the present invention, triangular carrier is optimized to adjustment, on conventional P WM basis, does not change computational process, computational methods and Compare Logic, only the triangular carrier signal phase is carried out to periodic modulation, can realize that even-order harmonic suppresses, and specifically comprises the following steps:
1), at each triangular carrier in the cycle, at first controller is obtained 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 such as the comparison value of SPWM is controller according to the sinusoidal modulation wave of controlling target and producing, the comparison value of SVPWM is that controller judge with vector and calculates by sector.
2) every one of the odd number of points of half primitive period or the half primitive period cycle, such as 1/3 half primitive period, controller is by the odd-multiple of 180 ° of the phase place phase shifts of triangular carrier: described first-harmonic is the first-harmonic that the PWM modulating wave is corresponding, the integral multiple that its frequency is frequency of modulated wave.Wherein the mode of phase shift is not limit, and preferably controller is directly by 180 ° of triangular carrier phase shifts, as shown in Figure 2, before phase shift, the trough of triangular carrier in triangular wave when each triangular carrier cycle starts, after phase shift, the crest of triangular carrier in triangular wave when each triangular carrier cycle starts.
3) controller carries out logic relatively to triangular carrier and comparison value: when triangular carrier is more than or equal to comparison value, and controller output " 1 ", when triangular carrier is less than comparison value, controller output " 0 "; Wherein Compare Logic can be that positive logic can be also negative logic.
4) obtain the PWM waveform that do not contain even-order harmonic.
Adopt this method to get equally A, the B moment in Fig. 1, after adopting phase-shifting carrier wave PWM method, corresponding PWM waveform as shown in Figure 3, can obviously be found out geometrical relationship, A, the B complete Symmetrical of PWM waveform corresponding to the moment.Known according to the Fourier decomposition law of half-wave symmetric function, do not contain even-order harmonic in the PWM waveform.
Below, with the example that is applied as in Three-phase SPWM, be called for short SPPWM.
As shown in Figure 4, A, B, C three-phase lag behind 120 ° to three-phase symmetrical Sine Modulated waveform successively, and constantly, controller carries out a phase shift to triangular carrier to every A phase zero passage, and 180 ° of phase shifts adopt direct phase shift system as shown in Figure 2.Random select t1 constantly, the PWM waveform that controller relatively obtains corresponding triangular carrier cycle internal modulation ripple and triangular carrier, as shown in Fig. 4 lower left, method corresponding to SPWM waveform wherein, SPPWM correspondence method of the present invention.For three-phase system, external behavior is mainly manifested in alternate, has therefore provided the alternate PWM waveform of AC, subtracts C by A and obtains.The moment t2 of selection and t1 half-wave symmetry, both time intervals are T/2, wherein T is the sinusoidal fundamental wave cycle.Adopt classical SPWM pulse modulation mode, the impulse waveform produced, as shown under Fig. 4, finds out from the alternate waveform of AC, waveform area and t1 complementation constantly in triangular carrier cycle, but waveform is not full symmetric, because the PWM waveform has been introduced the even-order harmonic component.Adopt phase-shifting carrier wave pulse duration modulation method of the present invention, SPPWM is 180 ° of t2 and t1 corresponding triangular carrier phase phasic differences constantly, as shown in Fig. 4 lower right, t2 is the alternate impulse waveform of AC and the t1 moment full symmetric of correspondence constantly, has effectively avoided 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.The occasions such as single-phase or heterogeneous, two level of AC applications or many level are all applicable.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; perhaps directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (4)
1. the phase-shifting carrier wave pulse duration modulation method, is characterized in that, comprises the following steps:
1), at each triangular carrier in the cycle, at first controller is obtained the comparison value of modulating wave: described triangular carrier is isosceles triangle wave;
2) every one of the odd number of points of half primitive period or the half primitive period cycle, controller is by the odd-multiple of 180 ° of the phase place phase shifts of triangular carrier;
3) controller carries out logic relatively to triangular carrier and comparison value: when triangular carrier is more than or equal to comparison value, and controller output " 1 ", when triangular carrier is less than comparison value, controller output " 0 ";
4) obtain the PWM waveform that do not contain even-order harmonic.
2. phase-shifting carrier wave pulse duration modulation method according to claim 1, is characterized in that step 2) in, controller is directly by 180 ° of the phase place phase shifts of triangular carrier.
3. phase-shifting carrier wave pulse duration modulation method according to claim 1, is characterized in that, in step 3), controller carries out positive logic relatively to triangular carrier and comparison value.
4. phase-shifting carrier wave pulse duration modulation method according to claim 1, is characterized in that, in step 3), controller carries out negative logic relatively to triangular carrier and comparison value.
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| CN104052320A (en) * | 2014-06-17 | 2014-09-17 | 华为技术有限公司 | PWM method and device |
| CN104184432A (en) * | 2014-08-20 | 2014-12-03 | 高玉琴 | Phase-shifting circuit |
| CN108141170A (en) * | 2015-09-30 | 2018-06-08 | 日产自动车株式会社 | Electrical control method and power control unit |
| WO2020093961A1 (en) * | 2018-11-06 | 2020-05-14 | 中国人民解放军海军工程大学 | Multi-frequency uniformization carrier wave slope random distribution pulse width modulation method |
| CN112290779A (en) * | 2020-10-16 | 2021-01-29 | 臻驱科技（上海）有限公司 | Pulse width modulation method for temporarily changing carrier wave form |
| CN113777388A (en) * | 2021-09-10 | 2021-12-10 | 王强 | Method for measuring effective value of periodic signal derivative |
| CN116545079A (en) * | 2023-07-07 | 2023-08-04 | 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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| WO2020093961A1 (en) * | 2018-11-06 | 2020-05-14 | 中国人民解放军海军工程大学 | Multi-frequency uniformization carrier wave slope random distribution pulse width modulation method |
| CN112290779A (en) * | 2020-10-16 | 2021-01-29 | 臻驱科技（上海）有限公司 | Pulse width modulation method for temporarily changing carrier wave form |
| CN113777388A (en) * | 2021-09-10 | 2021-12-10 | 王强 | Method for measuring effective value of periodic signal derivative |
| CN113777388B (en) * | 2021-09-10 | 2023-11-21 | 王强 | Method for measuring effective value of derivative of periodic signal |
| CN116545079A (en) * | 2023-07-07 | 2023-08-04 | 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 |
| 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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