CN106953536B - A kind of more level sinusoidal pulse width modulation methods - Google Patents

A kind of more level sinusoidal pulse width modulation methods Download PDF

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Publication number
CN106953536B
CN106953536B CN201710286573.9A CN201710286573A CN106953536B CN 106953536 B CN106953536 B CN 106953536B CN 201710286573 A CN201710286573 A CN 201710286573A CN 106953536 B CN106953536 B CN 106953536B
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carrier
wave
level
stacking
waveform
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CN106953536A (en
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张兰勇
曹岸
刘胜
杜逸璇
刘泽威
耿文杰
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Harbin Engineering University
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Harbin Engineering University
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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
    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • H02M7/53—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 is to provide a kind of more level sine pulsewidth methods.(1) according to converter levels number N, determine single carrier period intercarrier waveform from isosceles triangle carrier wave to the waveform convertion that more level triangular carriers are laminated；(2) according to converter levels number N, each stacking carrier wave successively 360 ° of phase shift/(N-1)；(3) modulating wave is compared with stacking carrier wave: when modulating wave is more than or equal to stacking carrier value output high level, when modulating wave exports low level less than stacking carrier value；(4) when modulating wave and each carrier band are compared each output PWM waveform all the way according to step (3), each road PWM waveform is finally obtained.The modulator approach that the present invention is mentioned can apply in single-phase and three-phase circuit, have good harmonic wave of output voltage performance, can effectively improve the utilization rate of DC voltage.

Description

A kind of more level sinusoidal pulse width modulation methods
Technical field
The present invention relates to a kind of pulse-width modulation method, specifically a kind of more level sinusoidal pulse width modulations (SPWM) method.
Background technique
Since the performance indicator that high power converter is pursued is mainly higher power supply quality and minimum switching frequency, Therefore demand of the high-voltage high-power converter to modulation scheme is also increasingly urgent to.Again due to two performances of power supply quality and switching frequency The constraint of index, modulation technique become one of the huge challenge that multi-level converter technical field is faced.
Multi-level converter Carrier-based PWM control strategy is that direct popularization of the two level carrier PWM technologies in more level is answered With.Carrier-based PWM technology is broadly divided into two classes based on the processing to carrier wave: pulse modulation technology (LS-PWM) and carrier wave is laminated in carrier wave Horizontal phase-shifted pulse width modulation technology (PS-PWM) technology, is disclosed report [Multilevel in pertinent literature converters:An enabling Technology for High-Power Applications.J Rodriguez,L G Franquelo,S Kouro,et al.Proc.IEEE,2009,97(11),1786-1817].Publication No. CN103490753A Patent document in, disclose " it is a kind of realize stacking carrier effect single-carrier modulated method ", what is provided is that carrier wave is laminated The carrier wave that modulation is had neither part nor lot in some period in more level carriers in PWM technology removes, and forms single carrier, but its modulation effect Fruit does not have significant optimization, and output harmonic wave performance and more level carriers are still identical.The patent of Publication No. CN103490652A Disclose a kind of " phase-shifting carrier wave pulse duration modulation method " in file, be with half of primitive period be unit, to triangular carrier into The phase shift that 180 ° of row is modulated and eliminates even-order harmonic, but such method only has a carrier wave and is not suitable for more level skills It is modulated in art.
Summary of the invention
The purpose of the present invention is to provide a kind of more level that can improve output harmonic wave performance, improve voltage utilization are sinusoidal Pulse duration modulation method.
The object of the present invention is achieved like this:
(1) according to converter levels number N, determine that single carrier period intercarrier waveform is more from isosceles triangle carrier wave to being laminated The waveform convertion of level triangular carrier；
(2) according to converter levels number N, each stacking carrier wave successively 360 ° of phase shift/(N-1)；
(3) modulating wave is compared with stacking carrier wave: exports high level when modulating wave is more than or equal to stacking carrier value, when Modulating wave is less than stacking carrier value and exports low level；
(4) when modulating wave and each carrier band are compared each output PWM waveform all the way according to step (3), final To each road PWM waveform, more level sinusoidal pulse width modulations are constituted.
It is described according to converter levels number N, determine single carrier period intercarrier waveform from isosceles triangle carrier wave to layer The method for folding the waveform convertion of more level triangular carriers are as follows:
(1) the isosceles triangle carrier wave in single carrier period is divided into N-1 equal part in vertical direction；
(2) the small isosceles triangle that amplitude is 1 is successively used horizontally to the right, vertical direction is from N-1 to 0 again to the diagonal of N-1 More level triangular carriers are laminated in mobile constitute in line direction；
(3) according to the movement rule of step (2) small isosceles triangle, a cycle layer is formed when mobile number is 2N-4 Fold more level triangular carriers；
(4) 360 ° of the advanced phase shift of more level triangular carriers/(2 (2N-4)) phase angle will be laminated.
The essence of technical solution of the present invention is: determining carrier waveform from isoceles triangle according to the level number of converter first Transformation of the carrier wave to the more level triangular carriers of stacking；Then to more level triangular carriers progress phase shifts are laminated, converter institute is determined All carrier waveforms needed；By the way that carrier wave compared with modulating wave, is exported high level when modulating wave is more than or equal to carrier value, Low level is then exported when modulating wave is less than carrier value, the PWM waveform on each road is obtained with this principle.
The advantages of technical solution, is:
(1) the power distribution uniformity advantages of phase-shifting carrier wave modulator approach are taken into account, while output voltage can be improved well Harmonic performance, especially low modulation than when harmonic performance improve it is significant.
(2) in multi-level converter circuit, which can effectively improve the utilization rate of DC voltage, to improve To the power output of exchange side.
The modulator approach that the present invention is mentioned can apply in single-phase and three-phase circuit, have good harmonic wave of output voltage Can, the utilization rate of DC voltage can be effectively improved.
Detailed description of the invention
Fig. 1 is the Transformation Graphs that more level triangular carriers are laminated；
Fig. 2 is that five level SPWMs modulate schematic diagram.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
Step (1), according to converter levels number N, determine single carrier period intercarrier waveform from isosceles triangle carrier wave to The waveform convertion of triangular carrier is laminated.In conjunction with Fig. 1, which includes the following steps:
1) the isosceles triangle carrier amplitude in single carrier period is that N-1 in vertical direction is divided into N-1 equal part, then every part Amplitude is 1；
2) successively using amplitude is 1, and period pulsewidth is TsThe small isosceles triangle of/(2N-4) horizontally to the right vertical direction from N- More level triangular carriers are laminated in 1 to 0 mobile constitute of diagonal for arriving N-1 again；
3) period of the isosceles triangle carrier wave in single carrier period is set as Ts, phase angle be 360 °, small isosceles triangle moves Form a cycle when dynamic number is 2N-4 and more level carriers be laminated, then every part of pulsewidth be 360 °/phase angle of (2N-4)；
4) it in order to make to be laminated more level triangular carrier balancing waveforms, is moved in advance here, more level triangular carriers will be laminated 360 ° of phase/(2 (2N-4)) phase angle.
Step (2), according to converter levels number N, each stacking carrier wave successively 360 ° of phase shift/(N-1), for N level Converter, required number of carrier wave are N-1, and by stacking carrier wave, successively 360 ° of phase shift/(N-1) phase angle can form required N- 1 carrier band.
Modulating wave is compared by step (3) with stacking carrier wave: when modulating wave is more than or equal to the high electricity of stacking carrier value output It is flat, low level is exported when modulating wave is less than stacking carrier value；When modulating wave with wherein a carrier band can be defeated according to this principle PWM waveform all the way out.
Step (4), when modulating wave and each carrier band are compared each output PWM waveform all the way according to step (3), most Each road PWM waveform is obtained eventually, constitutes more level sinusoidal pulse width modulations.When modulating wave is compared with N-1 carrier band respectively, then The PWM waveform on the road N-1 can be obtained.
Below by taking the modulation of five level SPWMs as an example, the modulator approach is illustrated:
In conjunction with Fig. 2, the level number of converter is 5, and isoceles triangle carrier wave vertical direction in the monocycle is divided into 4 equal parts, It may make up the more level triangular carriers of the stacking in the single carrier period with 6 small isosceles triangles in diagonal line distribution；It will stacking Successively 90 ° of phase shift of phase angle has then obtained 4 carrier band to carrier wave；Modulating wave is set as sine wave, sine wave and stacking carrier wave 1 into Row compare, when the value of sine wave be more than or equal to stacking carrier value when, output PWM1 waveform be high level, it is on the contrary then be low level. PWM2, PWM3 and PWM4 totally 4 road PWM waveform are finally respectively obtained compared with other carrier band respectively.

Claims (1)

1. a kind of more level sinusoidal pulse width modulation methods, it is characterized in that including the following steps:
Step (1) determines single carrier period intercarrier waveform from isosceles triangle carrier wave to stacking according to converter levels number N The waveform convertion of triangular carrier, specifically comprises the following steps:
1) the isosceles triangle carrier amplitude in single carrier period is divided into N-1 equal part in vertical direction for N-1, then every part of amplitude It is 1；
It 2) with amplitude is successively 1, period pulsewidth is TsThe small isosceles triangle of/(2N-4) horizontally to the right vertical direction from N-1 to 0 More level triangular carriers are laminated in mobile constitute of diagonal for arriving N-1 again；
3) period of the isosceles triangle carrier wave in single carrier period is set as Ts, phase angle be 360 °, the mobile number of small isosceles triangle Form a cycle when for 2N-4 and more level carriers be laminated, then every part of pulsewidth be 360 °/phase angle of (2N-4)；
4) 360 ° of the advanced phase shift of more level triangular carriers/(2 (2N-4)) phase angle will be laminated；
Step (2), according to converter levels number N, each stacking carrier wave successively 360 ° of phase shift/(N-1), the transformation for N level Device, required number of carrier wave are N-1, and by stacking carrier wave, successively 360 ° of phase shift/(N-1) phase angle can form required N-1 Carrier band；
Modulating wave is compared by step (3) with stacking carrier wave: high level is exported when modulating wave is more than or equal to stacking carrier value, Low level is exported when modulating wave is less than stacking carrier value；The PWM waveform of modulating wave and a carrier band output all the way；
Step (4), when modulating wave and each carrier band are compared each output PWM waveform all the way according to step (3), final To each road PWM waveform, more level sinusoidal pulse width modulations are constituted, when modulating wave is compared with N-1 carrier band respectively, are then obtained The PWM waveform on the road N-1.
CN201710286573.9A 2016-06-02 2017-04-27 A kind of more level sinusoidal pulse width modulation methods Active CN106953536B (en)

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CN109802589B (en) * 2019-03-21 2020-02-07 清华大学 Multi-level single carrier modulation method and system
CN109687748B (en) * 2019-01-18 2020-07-14 清华大学 Modulation and capacitance voltage balance control method of neutral point clamped five-level converter
JP6743952B1 (en) * 2019-07-23 2020-08-19 株式会社明電舎 Control system and control method for power converter with fixed pulse pattern
CN111654181A (en) * 2020-06-22 2020-09-11 中国联合网络通信集团有限公司 Converter control method and device

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CN102355137A (en) * 2011-10-01 2012-02-15 徐州中矿大传动与自动化有限公司 Equivalent space vector carrier modulation multilevel converter control method
CN103490753A (en) * 2013-09-25 2014-01-01 华北电力大学 Single carrier PWM method for achieving stacked carrier effect
CN104518702A (en) * 2013-10-07 2015-04-15 洛克威尔自动控制技术股份有限公司 Cascaded H-Bridge (CHB) inverter level shift PWM with rotation

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US6411530B2 (en) * 2000-04-06 2002-06-25 Robicon Corporation Drive and power supply with phase shifted carriers

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Publication number Priority date Publication date Assignee Title
CN102355137A (en) * 2011-10-01 2012-02-15 徐州中矿大传动与自动化有限公司 Equivalent space vector carrier modulation multilevel converter control method
CN103490753A (en) * 2013-09-25 2014-01-01 华北电力大学 Single carrier PWM method for achieving stacked carrier effect
CN104518702A (en) * 2013-10-07 2015-04-15 洛克威尔自动控制技术股份有限公司 Cascaded H-Bridge (CHB) inverter level shift PWM with rotation

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