CN103746593A - Uniform PWM modulation method and system on the basis of natural commutation - Google Patents
Uniform PWM modulation method and system on the basis of natural commutation Download PDFInfo
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Abstract
The invention is suitable for the technical field of electric power, and provides a uniform PWM modulation method on the basis of natural commutation. The method comprises the following steps: a per-unit value of a three-phase modulated wave is calculated; a real-time maximum value and a real-time minimum value of voltage of the three-phase modulated wave are calculated according to the per-unit value; the phase of the three-phase modulated wave shifts for 30 degrees; the real-time maximum value and the real-time minimum value of the three-phase modulated wave after phase shifting are calculated; zero-sequence components under three modulation modes of SPWM, SVPWM and DPWMx are calculated according to the real-time maximum value and the real-time minimum value of the voltage of the three-phase modulated wave before phase shifting and the maximum value and the minimum value of the voltage of the three-phase modulated wave after phase shifting; the zero-sequence components under the three modulation modes of SPWM, SVPWM and DPWMx are super-positioned in the three-phase modulated wave before phase shifting so that a uniform modulated wave signal is acquired; and the uniform modulated wave signal and a carrier wave signal are compared by a controller so that a driving signal for controlling a switch tube is acquired.
Description
Technical field
The invention belongs to power technology field, be specifically related to a kind of unified PWM modulator approach and system based on natural commutation.
Background technology
Due to the inverter of energy in bidirectional flow, the two-way changing between can realizing direct current and exchanging, is therefore widely used in the fields such as AC Drive driver, new forms of energy, UPS.How the modulation algorithm of control inverter switch sequential is the key technology of this device, wherein, sinusoidal pulse width modulation based on carrier wave (Sinusoidal Pulse Width Modulation, SPWM) and space vector modulation algorithm (Space Vector Pulse Width Modulation, SVPWM) be two kinds of the most frequently used modulation techniques, discontinuous pulse width modulation algorithm (the DPWMx based on carrier modulation that also has a kind of sphere of learning to introduce, x=0,1,2,3, MAX, MIN).
Above all kind of modulations algorithm respectively has pluses and minuses, as follows:
1. SPWM is by reference to voltage and triangular wave carrier comparison, in crosspoint moment control switch pipe break-make.In single-phase inverter, use extensively, realize simply, but line style modulation range is narrow, direct voltage utilance is low.
2. SVPWM space vector control direct voltage utilance is high by 15.47% compared with SPWM, and waveform quality is high, unaffected at different modulation ratio region waveform qualities.But traditional SVPWM method need to be carried out complicated coordinate transform, trigonometric function calculating, sector judgement, calculating action time of effective vector etc.Take cpu resource many, realtime control is affected.In addition, switching tube is on off state constantly, and switching loss is large.
3. DPWMx algorithm has higher direct voltage utilance equally, and in addition, in 1/3 civil power cycle, switching tube keeps fixing (pass) state of opening, and theoretical loss can reduce more than 30%.But DPWMx algorithm lacks concrete easy engineering construction method.
By above-mentioned analysis, can be drawn, under different fields and operating state, all kinds of PWM modulation algorithms have different pluses and minuses, meanwhile, above-mentioned all kind of modulations mode can be switched online, and can not affect the job stability of inverter, like this, for unified all kind of modulations algorithm becomes possibility.Therefore, how to set up a kind of unified modulation algorithm, maximize favourable factors and minimize unfavourable ones and become technical issues that need to address.
Summary of the invention
In view of this, provide a kind of unified PWM modulator approach and system based on natural commutation.
The present invention is achieved in that a kind of unified PWM modulator approach based on natural commutation, comprises the following steps: the per unit value that calculates three-phase modulations ripple; According to per unit value, calculate real-time maximum and the real-time minimum value of three-phase modulations wave voltage; Three-phase modulations ripple phase shift 30 degree; Calculate real-time maximum and real-time minimum value after the phase shift of three-phase modulations wave voltage; According to maximum and the minimum value of the three-phase modulations wave voltage after the real-time maximum of the three-phase modulations wave voltage before phase shift and minimum value, phase shift in real time, calculate the zero-sequence component under SPWM, SVPWM and tri-kinds of modulation systems of DPWMx; Zero-sequence component under SPWM, SVPWM and tri-kinds of modulation systems of DPWMx is added in phase shift three-phase modulating wave, obtains unified modulation wave signal; The relatively more unified modulation wave signal of controller and carrier signal, the driving signal of acquisition control switch pipe.
The present invention also provides a kind of unified PWM modulating system based on natural commutation, comprise modulating wave computing unit and inverter, described modulating wave computing unit produces and drives signal, and the switching tube by inverter described in described driving signal controlling is to control described inverter; Wherein, described modulating wave computing unit comprises: three phase sine modulation signal module, produces and differ successively 120 degree phase places, the three phase sine modulation signal that amplitude is identical; Zero-sequence component computing module, the described three-phase signal sinusoidal modulation signal producing according to described three phase sine modulation signal module, calculates zero-sequence component, and the frequency of described zero-sequence component is three times of described three phase sine modulation signal; Unified modulation module, obtains unified modulation signal by described zero-sequence component by the described three phase sine modulation signal that is added to after suing for peace; Controller, contrasts described unified modulation signal and carrier module, obtains the driving signal of controlling described switching tube.
Above-mentioned unified PWM modulator approach and system based on natural commutation, utilize three-phase reference voltage instantaneous value to calculate the switching over time of various continuous and discontinuous PWM modulator approaches, without carrying out complicated sector judgement, reduced the computing time of modulation algorithm and realized difficulty, having calculated the easy computer realization that is easy to.Meanwhile, this algorithm can carry out the switching of various modulation systems online, can give full play to DPWMx modulation system switching loss low, the advantage that efficiency is high.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention is based on the unified PWM modulator approach of natural commutation;
Fig. 2 is the circuit diagram of modulating wave computing unit that the present invention is based on the unified PWM modulating system of natural commutation;
Fig. 3 is the circuit diagram of two-level inverter the first execution mode that the present invention is based on the unified PWM modulating system of natural commutation;
Fig. 4 is the circuit diagram of three-level inverter the second execution mode that the present invention is based on the unified PWM modulating system of natural commutation;
Fig. 5 is the circuit diagram of three-level inverter the 3rd execution mode that the present invention is based on the unified PWM modulating system of natural commutation.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1 is the flow chart of the unified PWM modulator approach based on natural commutation.
Step S10, the per unit value of calculating three-phase modulations ripple.According to the three-phase modulations ripple of contravarianter voltage ring or voltage, double current loop modulation output (
,
,
):
=
(1)
Wherein,
for output line voltage peak value.
Step S11, calculates the real-time maximum of described three-phase modulations wave voltage and real-time minimum value according to the per unit value of formula (1).
(2)
Wherein,
instantaneous maximum;
instantaneous minimum value; Max: maximum value calculation function; Min: minimum value computing function;
Step S12, described three-phase modulations ripple phase shift 30 degree.
Step S13, calculates real-time maximum and real-time minimum value after the phase shift of described three-phase modulations wave voltage.Three-phase modulations ripple, is multiplied by a phse conversion matrix T 0, calculates the reference voltage after leading phase shift 30 degree
,
.
Wherein,
,
30 degree reference voltages,
30 degree reference voltages,
30 degree reference voltages.
Step S14, maximum and the minimum value of the three-phase modulations wave voltage after the phase shift that the real-time maximum of the three-phase modulations wave voltage before the phase shift obtaining according to formula (1) and real-time minimum value, formula (4) obtain are calculated the zero-sequence component under SPWM, SVPWM and tri-kinds of modulation systems of DPWMx.
(5)
(6)
instantaneous maximum,
instantaneous minimum value;
Step S15, is added to the zero-sequence component under described SPWM, SVPWM and tri-kinds of modulation systems of DPWMx in described phase shift three-phase modulating wave, obtains unified modulation wave signal.
Wherein,
,
.
Step S16, the more described unified modulation wave signal of controller and carrier signal, the driving signal of acquisition control switch pipe.The zero-sequence component calculating according to formula (7), in the reference three-phase modulations ripple of the formula that is added to (1), obtains final unified modulation wave signal.
By intelligent selection module, determine a kind of output the in the different modulating wave of selecting to be obtained by above-mentioned formula (8).
The final unified modulation wave signal being obtained by above-mentioned formula (8), digitial controller calculates needed comparison value, compares with the carrier signal of controller internal pair production, obtains the driving signal of final control switch pipe.
The above-mentioned unified PWM modulation fast algorithm based on natural commutation, by three-phase, with reference to the crosspoint of modulation signal, carry out natural commutation control, only need carry out maximum (little) value and calculate, amount of calculation is little, is applicable to very much digitlization (as single-chip microcomputer, DSP etc.) and controls.In addition, unified modulating wave and the digitlization carrier wave to injection zero-sequence component of conventional all kind of modulations algorithm realized, can be given full play to the advantage of all kind of modulations algorithm, according to concrete inverter style and load characteristic, change online modulation system.In addition under inverter high frequency, many level trend, it is increasing that switching loss can account for the ratio of machine loss, and the low switching losses DPWMx algorithm that the present invention realizes can significantly improve overall efficiency, has very large economic benefit and market efficiency.
Fig. 2 is the circuit diagram of modulating wave computing unit that the present invention is based on the unified PWM modulating system of natural commutation.Unified PWM modulating system that should be based on natural commutation, comprises modulating wave computing unit 1 and inverter 2, and described modulating wave computing unit 1 produces driving signal, and the switching tube by inverter 2 described in described driving signal controlling is to control described inverter.Modulating wave computing unit 1 comprises three phase sine modulation signal module 10, zero-sequence component computing module 11, unified modulation module and controller.
Three phase sine modulation signal module 10, produces and differs successively 120 degree phase places, the three phase sine modulation signal that amplitude is identical.
as the mathematical description of formula 1, three differs 120 degree phase places successively, and amplitude is identical.
Zero-sequence component computing module 11, the described three-phase signal sinusoidal modulation signal producing according to described three phase sine modulation signal module, calculates zero-sequence component, and the frequency of described zero-sequence component is three times of described three phase sine modulation signal.According to aforementioned formula (1) and formula (4), calculate the zero-sequence component of selected modulation system, the frequency of this zero-sequence component is three times in sinusoidal modulation signal, corresponding its corresponding zero-sequence component computational methods of each modulation system, specifically implement as shown in aforementioned formula (7).Natural commutation is carried out in crosspoint by three-phase modulations signal, has avoided complicated sector judgement.Described zero-sequence component computational methods are a kind of unified calculation modes, and meanwhile, each computational methods can independently be taken out use
Unified modulation module, obtains unified modulation signal 12 by described zero-sequence component by the described three phase sine modulation signal that is added to after suing for peace.
Controller, contrasts described unified modulation signal 12 and carrier module 13, obtains the driving signal of controlling described switching tube.This driving signal be unified modulation signal 12 by relatively producing drive pulse signal in crosspoint with carrier signal 13, the compound mode of unified modulation signal 12 and carrier signal 13 has 8 kinds, respectively corresponding different zero-sequence components.This controller can produce by digitial controller (MCU, DSP) is inner, also can by signal generator, comparator and amplifying circuit, be realized by analog circuit.
As in Figure 3-5, be the circuit diagram of the inverter of the unified PWM modulating system based on natural commutation.The occasions such as this inverter 2 is can application of motor control, uninterrupted power supply, combining inverter.This inverter 2 is comprised of DC capacitor 21, three phase inverter bridge 22 and filter 23, and described three phase inverter bridge is connected between described DC capacitor and described filter.
Fig. 3 is the circuit diagram of two-level inverter the first execution mode that the present invention is based on the unified PWM modulating device of natural commutation, and in this embodiment, the DC capacitor of inverter 2 is single capacitor.Three phase inverter bridge 22 comprises Sa+, Sa-, Sb+, Sb-, Sc+, Sc-, D1, D2, D3, D4, D5, D6, and output terminals A, B, C and output filter 23 form.Sa+, Sa-, Sb+, Sb-, Sc+, Sc-are electronic power switch device, can be IGBT, MOSFET or other conventional power electronic device, and D1, D2, D3, D4, D5, D6 are body diode.
Wherein, Sa+ is in parallel with D1, and Sa-is in parallel with D2, and Sb+ is in parallel with D3, and Sb-is in parallel with D4, and Sc+ is in parallel with D5, and Sc-is in parallel with D6.DC source Ud positive pole is connected with Sa+ drain electrode, Sb+ drain electrode, Sc+ drain electrode respectively, and negative pole is connected with Sa-, Sb-, Sc-source electrode respectively.
If Fig. 4 is the circuit diagram of three-level inverter the second execution mode that the present invention is based on the unified PWM modulating device of natural commutation, inverter 2 is three-phase I type three-level inverter, and DC capacitor is two capacitor architecture.
If Fig. 5 is the circuit diagram of three-level inverter the 3rd execution mode that the present invention is based on the unified PWM modulating device of natural commutation, inverter 2 is the T-shaped three-level inverter of three-phase, and DC capacitor is two capacitor architecture.
As above, unified PWM modulator approach and system based on natural commutation provided by the present invention, carries out natural commutation control by three-phase with reference to the crosspoint of modulation, only need carry out maximum (little) value and calculate, amount of calculation is little, is applicable to very much digitlization (as single-chip microcomputer, DSP etc.) and controls.In addition, unified modulating wave and the digitlization carrier wave to injection zero-sequence component of conventional all kind of modulations algorithm realized, can be given full play to the advantage of all kind of modulations algorithm, according to concrete inverter style and load characteristic, change online modulation system.In addition under inverter high frequency, many level trend, it is increasing that switching loss can account for the ratio of machine loss.The DPWMx modulator approach that the present invention realizes had at a civil power in the cycle, the feature that has 1/3 cycle (each 60 degree phase angle of positive and negative semiaxis) switching signal to remain unchanged.Make electronic power switch device reduce on-off times, improved overall efficiency.In order further to raise the efficiency, the present invention has realized in the positive and negative peak point 60 degree phase angular regions of electric current, and the driving signal under DPWMx modulator approach remains unchanged.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the unified PWM modulator approach based on natural commutation, is characterized in that, comprises the following steps:
Calculate the per unit value of three-phase modulations ripple;
According to described per unit value, calculate real-time maximum and the real-time minimum value of described three-phase modulations wave voltage;
Described three-phase modulations ripple phase shift 30 degree;
Calculate real-time maximum and real-time minimum value after the phase shift of described three-phase modulations wave voltage;
According to maximum and the minimum value of the three-phase modulations wave voltage after the real-time maximum of the three-phase modulations wave voltage before described phase shift and minimum value, described phase shift in real time, calculate the zero-sequence component under SPWM, SVPWM and tri-kinds of modulation systems of DPWMx;
Zero-sequence component under described SPWM, SVPWM and tri-kinds of modulation systems of DPWMx is added in described phase shift three-phase modulating wave, obtains unified modulation wave signal;
The more described unified modulation wave signal of controller and carrier signal, the driving signal of the switching tube of acquisition control inverter.
2. the unified PWM modulator approach based on natural commutation as claimed in claim 1, is characterized in that, per unit value described in this step of per unit value of described calculating three-phase modulations ripple is to calculate acquisition according to output line voltage peak value and DC side bus voltage value.
3. the unified PWM modulator approach based on natural commutation as claimed in claim 1, is characterized in that, phase shift 30 degree described in described three-phase modulations ripple phase shift 30 these steps of degree are by three-phase modulations ripple, to be multiplied by a phse conversion matrix T 0 to realize.
4. the unified PWM modulator approach based on natural commutation as claimed in claim 1, is characterized in that, described controller is single-chip microcomputer.
5. the unified PWM modulator approach based on natural commutation as claimed in claim 1, is characterized in that, described controller is digital signal processor.
6. the unified PWM modulating system based on natural commutation, it is characterized in that: comprise modulating wave computing unit and inverter, described modulating wave computing unit produces and drives signal, and the switching tube by inverter described in described driving signal controlling is to control described inverter; Wherein, described modulating wave computing unit comprises:
Three phase sine modulation signal module, produces and differs successively 120 degree phase places, the three phase sine modulation signal that amplitude is identical;
Zero-sequence component computing module, the described three-phase signal sinusoidal modulation signal producing according to described three phase sine modulation signal module, calculates zero-sequence component, and the frequency of described zero-sequence component is three times of described three phase sine modulation signal;
Unified modulation module, obtains unified modulation signal by described zero-sequence component by the described three phase sine modulation signal that is added to after suing for peace;
Controller, contrasts described unified modulation signal and carrier module, obtains the driving signal of controlling described switching tube.
7. the unified PWM modulating device based on natural commutation as claimed in claim 6, is characterized in that, described inverter is three-phase two-level inverter.
8. the unified PWM modulating device based on natural commutation as claimed in claim 7, it is characterized in that, described three-phase two-level inverter is comprised of DC capacitor, three phase inverter bridge and filter, and described three phase inverter bridge is connected between described DC capacitor and described filter.
9. the unified PWM modulating device based on natural commutation as claimed in claim 8, is characterized in that, described DC capacitor is single capacitor or two capacitor architecture.
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| CN107147314A (en) * | 2017-06-13 | 2017-09-08 | 山东大学 | Correct the carrier modulating method of zero-sequence component injection |
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| CN108123618B (en) * | 2016-11-30 | 2020-04-28 | 华为技术有限公司 | Pulse width modulation method, pulse width modulation system and controller |
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| CN107147314B (en) * | 2017-06-13 | 2019-03-29 | 山东大学 | Correct the carrier modulating method of zero-sequence component injection |
| CN107147314A (en) * | 2017-06-13 | 2017-09-08 | 山东大学 | Correct the carrier modulating method of zero-sequence component injection |
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| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN GROWATT NEW ENERGY CO., LTD. Free format text: FORMER OWNER: SHENZHEN SHANGYING NEW ENERGY CO., LTD. Effective date: 20140422 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xiong Wei Inventor after: Shao Changwei Inventor after: Ding Yongqiang Inventor before: Zhou Qian Inventor before: Xiong Wei Inventor before: Shao Changwei Inventor before: Ding Yongqiang |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20140422 Address after: 518000, Shiyan City, Guangdong, Baoan District Province, on the west side of the village on the west side of the ridge, plus five industrial zone, a layer of three, East and Shenzhen Applicant after: Shenzhen Growatt New Energy Co., Ltd. Address before: 518000, No. 5, building 506, Huafeng Xin'an youth entrepreneurship base, No. 41, 8 District, Shenzhen, Guangdong, Baoan District Applicant before: SHENZHEN SHANGYING NEW ENERGY CO., LTD. |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140423 |
|
| RJ01 | Rejection of invention patent application after publication |