CN204013277U - Unified PWM modulating system based on natural commutation - Google Patents
Unified PWM modulating system based on natural commutation Download PDFInfo
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Abstract
The utility model is applicable to power technology field, a kind of unified PWM modulating system based on natural commutation is provided, 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 sine 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.
Description
Technical field
The utility model belongs to power technology field, is specifically related to a kind of unified PWM modulating 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.
Utility model content
In view of this, provide a kind of unified PWM modulating system based on natural commutation.
The utility model is to realize like this, 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 sine 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.
The above-mentioned unified PWM modulating 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 circuit diagram of the modulating wave computing unit of the unified PWM modulating system of the utility model based on natural commutation;
Fig. 2 is the circuit diagram of two-level inverter first execution mode of the unified PWM modulating system of the utility model based on natural commutation;
Fig. 3 is the circuit diagram of three-level inverter second execution mode of the unified PWM modulating system of the utility model based on natural commutation;
Fig. 4 is the circuit diagram of three-level inverter the 3rd execution mode of the unified PWM modulating system of the utility model based on natural commutation.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the circuit diagram of the modulating wave computing unit of the unified PWM modulating system of the utility model based on 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, the per unit value of calculating three-phase modulations ripple.According to inverter 2 Voltage loop or voltage, double current loop modulation output differ successively 120 degree phase places, the three phase sine modulation signal that amplitude is identical (
,
,
):
=
=
(1)
=
Wherein,
for output line voltage peak value.
According to the per unit value of formula (1), calculate real-time maximum and the real-time minimum value of described three-phase modulations wave voltage.
(2)
Wherein,
instantaneous maximum;
instantaneous minimum value; Max: maximum value calculation function; Min: minimum value computing function;
By 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.Three-phase modulations ripple, is multiplied by a phse conversion matrix T 0, calculates the reference voltage after leading phase shift 30 degree
,
.
(4)
Wherein,
,
30 degree reference voltages,
30 degree reference voltages,
30 degree reference voltages.
Zero-sequence component computing module 11, 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.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.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.
(5)
(6)
instantaneous maximum,
instantaneous minimum value;
Unified modulation module, obtains unified modulation signal 12 by the zero-sequence component under described SPWM, SVPWM and tri-kinds of modulation systems of DPWMx by the described three phase sine modulation signal that is added to after suing for peace.
(7)
Wherein,
,
.
The more described unified modulation wave signal 12 of controller and carrier signal 13, 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.
(8)
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 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.
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.
As in Figure 2-4, be the circuit diagram of the inverter of the unified PWM modulating system based on natural commutation.The occasions such as this inverter 2 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. 2 is the circuit diagram of two-level inverter first execution mode of the unified PWM modulating device of the utility model based on 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.
Filter 23 is LC type or LCL type.
If Fig. 3 is the circuit diagram of three-level inverter second execution mode of the unified PWM modulating device of the utility model based on natural commutation, inverter 2 is three-phase I type three-level inverter, and DC capacitor is two capacitor architecture.
If Fig. 4 is the circuit diagram of three-level inverter the 3rd execution mode of the unified PWM modulating device of the utility model based on 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 modulating system based on natural commutation provided by the utility model, 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 utility model is realized 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 utility model has been 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 utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. 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 sine 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.
2. the unified PWM modulating system based on natural commutation as claimed in claim 1, is characterized in that, described inverter is three-phase two-level inverter.
3. the unified PWM modulating system based on natural commutation as claimed in claim 2, 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.
4. the unified PWM modulating system based on natural commutation as claimed in claim 3, is characterized in that, described DC capacitor is single capacitor or two capacitor architecture.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746593A (en) * | 2013-12-19 | 2014-04-23 | 深圳尚英新能源有限公司 | Uniform PWM modulation method and system on the basis of natural commutation |
| CN108429478A (en) * | 2018-03-23 | 2018-08-21 | 南京铁道职业技术学院 | A kind of single-phase three level T-type inverter efficiency optimal control method |
-
2013
- 2013-12-19 CN CN201320842169.2U patent/CN204013277U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746593A (en) * | 2013-12-19 | 2014-04-23 | 深圳尚英新能源有限公司 | Uniform PWM modulation method and system on the basis of natural commutation |
| CN108429478A (en) * | 2018-03-23 | 2018-08-21 | 南京铁道职业技术学院 | A kind of single-phase three level T-type inverter efficiency optimal control method |
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Effective date of registration: 20210208 Address after: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. Address before: East and third floors, 1st floor, building 5, west side of Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Address after: 518101 floor a401, 4-13, building a, Sino German European Industrial Demonstration Park, Hangcheng Avenue, guxing community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Growatt New Energy Technology Co.,Ltd. Address before: 518101 2 / F and 3 / F, building 4, xibianling Jiayu Company Industrial Zone, Shangwu village, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GROWATT NEW ENERGY Co.,Ltd. |
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