CN106452128A - Control method and device for solving space vector pulse width modulation current zero-crossing distortion - Google Patents
Control method and device for solving space vector pulse width modulation current zero-crossing distortion Download PDFInfo
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- CN106452128A CN106452128A CN201610929673.4A CN201610929673A CN106452128A CN 106452128 A CN106452128 A CN 106452128A CN 201610929673 A CN201610929673 A CN 201610929673A CN 106452128 A CN106452128 A CN 106452128A
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/2173—Conversion of ac power input into dc 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 in a biphase or polyphase circuit arrangement
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Abstract
The invention relates to a control method and device for solving space vector pulse width modulation current zero-crossing distortion. The method comprises the following steps: to begin with, collecting each phase of phase voltage; then, judging whether phase voltage crosses zero in a positive zero-crossing manner or a negative zero-crossing manner; when the phase voltage crosses zero in a positive zero-crossing manner, a positive/ negative carrier switching point is arranged within COMP-PRD; and when the phase voltage crosses zero in a negative zero-crossing manner, the positive/ negative carrier switching point is arranged within 0-COMP. The method can effectively increase switching point switch tube conduction time to reduce abrupt change of zero crossing point duty ratio, thereby reducing zero-crossing point current distortion. The method is simple in control process, reduces control complexity and improves control reliability.
Description
Technical field
The present invention relates to solving control method and the device of space vector pulse width modulation current zero-crossing point distortion.
Background technology
In three-phase rectifier control system, it is more general that vector sends out ripple mode (i.e. space vector pulse width modulation mode, SVPWM)
Tong Fabo mode has that inductive current ripple is little, rapid dynamic response speed and high reliability, is therefore widely used；Vector
Send out wave property and determine that ac phase voltage passes through and switches positive and negative triangular carrier during zero point, now triangular carrier moves right 180 ° of phases
Parallactic angle, causes the PWM duty cycle of 1.5 times of switch periods to be mutated, leads to current distortion, the voltage ride-through zero point of any phase
There is this phase current zero cross distortion in Shi Douhui, have influence on other biphase, three-phase current influences each other, and causes repeatedly humorous simultaneously
Ripple, causes harmonic pollution to electrical network.
Current zero-crossing point distortion is the intrinsic problem sending out ripple mode three-phase rectifier based on vector, but current zero-crossing point distortion
Degree depends on the switching point of positive and negative carrier wave, and switching point difference leads to dutycycle distortion different, when input voltage passes through zero point
When, input voltage is close to zero, and current sinusoidal ripple has rising greatest gradient here, so inductance two ends need maximum volt
Second product moment, switching tube dutycycle close to 1, so selecting will make the PWM duty of 1.5 times of switch periods during carrier switch point as far as possible
Ratio remains 1, thus can reduce the dutycycle mutation of zero crossing, and then reduce current distortion.
Both at home and abroad based on the current zero-crossing point aberration control research that vector sends out ripple, two kinds are broadly divided into three-phase rectifier：Soft
Part controls and hardware circuit controls.Software controls and mainly passes through to adjust current loop parameter, makes electric current loop as fast as possible, is disappeared with this
Except current distortion, this method needs to weigh system stability and reliability；Hardware approach mainly passes through to increase PFC inductance sense
Amount, increases sensibility reciprocal and can reduce current distortion, but after inductance change, whole control system mathematical model changes, and software controls
Parameter need to be adjusted again, more complicated.
Content of the invention
It is an object of the invention to provide a kind of control method solving the distortion of space vector pulse width modulation current zero-crossing point, use
More complicated to solve the problems, such as the control method that traditional solution current zero-crossing point distorts.Present invention simultaneously provides a kind of solve
The control device of space vector pulse width modulation current zero-crossing point distortion.
For achieving the above object, the solution of the present invention includes：A kind of solution space vector pulse width modulation current zero-crossing point is abnormal
The control method becoming, comprises the following steps：
(1) gather the phase voltage of each phase；
(2) judging phase voltage to pass through during zero point is positive going zeror crossing or negative sense zero passage, when phase voltage positive going zeror crossing, just,
Negative carrier switching point is arranged on COMP～PRD；When phase voltage negative sense zero passage, positive and negative carrier switch point is arranged on 0～COMP.
The Rule of judgment that A phase voltage Va forward direction passes through zero point is：Va instantaneous value is close to zero, Vb instantaneous value close to Vm*
Sin60 °, close-Vm*sin60 ° of Vc instantaneous value；The Rule of judgment that B phase voltage Vb forward direction passes through zero point is：Vb instantaneous value is close
Zero, Vc instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Va instantaneous value；C phase voltage Vc forward direction passes through the judgement bar of zero point
Part is：Vc instantaneous value close to zero, Va instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Vb instantaneous value；
The Rule of judgment that A phase voltage Va negative sense passes through zero point is：Va instantaneous value is close to the close-Vm* of zero, Vb instantaneous value
Sin60 °, Vc instantaneous value is close to Vm*sin60 °；The Rule of judgment that B phase voltage Vb negative sense passes through zero point is：Vb instantaneous value is close
Close-Vm*sin60 ° of zero, Vc instantaneous value, Va instantaneous value is close to Vm*sin60 °；C phase voltage Vc negative sense passes through the judgement bar of zero point
Part is：Close-Vm*sin60 ° close to zero, Va instantaneous value of Vc instantaneous value, Vb instantaneous value is close to Vm*sin60 °；Wherein Vm is mutually electric
The amplitude of pressure.
Relation between COMP and PRD is：COMP ＞ 50%PRD.
Described COMP=60%PRD.
A kind of control device solving the distortion of space vector pulse width modulation current zero-crossing point, including：
Acquisition module, for gathering the phase voltage of each phase；
Control module, is positive going zeror crossing or negative sense zero passage for judging phase voltage to pass through during zero point, when phase voltage is positive
During zero passage, positive and negative carrier switch point is arranged on COMP～PRD；When phase voltage negative sense zero passage, positive and negative carrier switch point setting
In 0～COMP.
The Rule of judgment that A phase voltage Va forward direction passes through zero point is：Va instantaneous value is close to zero, Vb instantaneous value close to Vm*
Sin60 °, close-Vm*sin60 ° of Vc instantaneous value；The Rule of judgment that B phase voltage Vb forward direction passes through zero point is：Vb instantaneous value is close
Zero, Vc instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Va instantaneous value；C phase voltage Vc forward direction passes through the judgement bar of zero point
Part is：Vc instantaneous value close to zero, Va instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Vb instantaneous value；
The Rule of judgment that A phase voltage Va negative sense passes through zero point is：Va instantaneous value is close to the close-Vm* of zero, Vb instantaneous value
Sin60 °, Vc instantaneous value is close to Vm*sin60 °；The Rule of judgment that B phase voltage Vb negative sense passes through zero point is：Vb instantaneous value is close
Close-Vm*sin60 ° of zero, Vc instantaneous value, Va instantaneous value is close to Vm*sin60 °；C phase voltage Vc negative sense passes through the judgement bar of zero point
Part is：Close-Vm*sin60 ° close to zero, Va instantaneous value of Vc instantaneous value, Vb instantaneous value is close to Vm*sin60 °；Wherein Vm is mutually electric
The amplitude of pressure.
Relation between COMP and PRD is：COMP ＞ 50%PRD.
Described COMP=60%PRD.
It is whole that the control method of the solution space vector pulse width modulation current zero-crossing point distortion that the present invention provides is applied to three-phase
Stream device, gathers the phase voltage of each phase first；Then being passed through during zero point according to phase voltage is positive going zeror crossing or negative sense zero passage sets
Fixed positive and negative carrier switch point, when phase voltage positive going zeror crossing, positive and negative carrier switch point is arranged on COMP～PRD；Work as phase voltage
During negative sense zero passage, positive and negative carrier switch point is arranged on 0～COMP, can effectively increase switching point switching tube by this method
ON time, reduces the mutation of zero crossing dutycycle with this, thus reducing zero crossing current distortion.And, the method controlled
Journey is relatively simple, reduces control complexity, improves control reliability.
And, based on space vector pulse width modulation near zero-crossing point output driving dutycycle close to 1 thinking, as long as logical
Cross and positive and negative carrier switch point is set makes output driving dutycycle remain 1 it is possible to reduce dutycycle mutation, and then reduced
The distortion of zero current.Ensure that whole three-phase rectifier system makes electricity on the basis of not changing hardware circuit and control parameter
Flow through zero point and there is less distortion, modification debugging is simple, and cost-effective, control effect is good.
Brief description
Fig. 1 is three-phase rectifier topology schematic diagram；
Fig. 2 is three-phase alternating current input phase voltage zero-acrross ing moment schematic diagram；
Fig. 3 be positive carrier to negative carrier switch when switching point set schematic diagram；
Fig. 4 is that during load wave direction positive carrier switching, switching point sets schematic diagram.
Specific embodiment
Control method embodiment
As shown in figure 1, a kind of its topological diagram of three-phase rectifier of providing for the present embodiment, the inventive point of the present invention is
A kind of control method solving the distortion of space vector pulse width modulation (SVPWM) current zero-crossing point, so, this control method not office
It is limited to the three-phase rectifier in Fig. 1.Be additionally, since space vector pulse width modulation (SVPWM) technology and belong to prior art, at present this
One technology is more ripe, then the present embodiment just no longer describes in detail to SVPWM in itself.
As shown in figure 1, Va, Vb are that three-phase rectifier exchanges input with Vc, the alternating current of input is through EMI electromagnetism interference
Circuit is processed, and La, Lb and Lc are Boost inductance, and D1 D6 is commutation diode, and Q1, Q2, Q3, Q4, Q5 and Q6 are rectifications
Device metal-oxide-semiconductor, Vp and Vn is positive and negative bus capacitor respectively.Three-phase alternating current input voltage through commutation diode and metal-oxide-semiconductor, and
The effect of positive and negative busbar electric capacity, exports DC voltage.
In the present embodiment, using TI TMS320F28035 as DSP control system control chip, dominant frequency reaches 60MHz,
The calculating of various digital control algorithms quickly can be completed in real time.The control method that the present invention is provided is with the shape of software program
Formula is carried in this control chip, realizes correspondingly controlling, that is, by judge phase voltage to pass through during zero point to be positive going zeror crossing or
Negative sense zero passage setting the switching point of positive and negative carrier wave, with this intrinsic problem mistake to three-phase rectifier space vector pulse width modulation
Zero current distortion is controlled.
Firstly, it is necessary to the phase voltage of the collection each phase of three-phase rectifier, and the information of voltage collecting is inputed to DSP,.
Then, DSP judge each phase voltage to pass through during zero point according to each phase phase voltage collecting to be positive going zeror crossing or
Negative sense zero passage, to set positive and negative carrier switch point with this.A kind of phase voltage given below passes through zero point to be positive going zeror crossing or bears
Judgment mode to zero passage.
As shown in Fig. 2 the Rule of judgment that A phase voltage Va forward direction passes through zero point is：Va instantaneous value connects close to zero, Vb instantaneous value
Nearly Vm*sin60 °, close-Vm*sin60 ° of Vc instantaneous value；The Rule of judgment that B phase voltage Vb forward direction passes through zero point is：Vb instantaneous value
Close to zero, Vc instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Va instantaneous value；C phase voltage Vc forward direction passes through sentencing of zero point
Broken strip part is：Vc instantaneous value close to zero, Va instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Vb instantaneous value；A phase voltage
The Rule of judgment that Va negative sense passes through zero point is：Close-Vm*sin60 ° close to zero, Vb instantaneous value of Va instantaneous value, Vc instantaneous value is close
Vm*sin60°；The Rule of judgment that B phase voltage Vb negative sense passes through zero point is：Vb instantaneous value is close to the close-Vm* of zero, Vc instantaneous value
Sin60 °, Va instantaneous value is close to Vm*sin60 °；The Rule of judgment that C phase voltage Vc negative sense passes through zero point is：Vc instantaneous value is close
Close-Vm*sin60 ° of zero, Va instantaneous value, Vb instantaneous value is close to Vm*sin60 °；Wherein Vm is the amplitude of three-phase alternating current phase voltage.
Above-mentioned when judging, be all correspondingly to be judged close to certain value using three-phase phase voltage, in each criterion
" close " can be understood as "Yes" because：Such as, when A phase voltage Va forward direction passes through zero point, Va instantaneous value is zero, Vb wink
Duration is Vm*sin60 °, and Vc instantaneous value is-Vm*sin60 °.Other judgements are also such.
As shown in figure 3, for wherein any one phase, when phase voltage positive going zeror crossing, corresponding positive and negative carrier switch point sets
Put in COMP～PRD.Based on space vector pulse width modulation near zero-crossing point simultaneously output driving dutycycle close to 1 thinking,
When D dutycycle convergence 1, the dutycycle mutation that positive carrier causes to negative carrier switching is minimum, and then makes phase voltage positive going zeror crossing
When zero crossing current distortion be inhibited.
As shown in figure 4, when phase voltage negative sense zero passage, corresponding positive and negative carrier switch point is arranged on 0～COMP.It is based on
Space vector pulse width modulation near zero-crossing point, close to 1 thinking, when D dutycycle convergence 1, bear simultaneously by output driving dutycycle
The dutycycle mutation that carrier wave causes to positive carrier switching is minimum, and then so that zero crossing current distortion during phase voltage negative sense zero passage is obtained
Suppression.
Wherein, COMP value is carrier wave fiducial value, can be calculated by the control chip in system, also can be directly according to reality
Situation is set, and COMP value plays to adjust opens the effect that power closes pipe dutycycle size；COMP value is limited and arrives PRD value in 0
Between.PRD value is carrier cycle time value, determines power switch pipe operating frequency, and PRD value is equal to 1/2nd of switch periods.And
And, from Fig. 3 or Fig. 4, the relation between COMP and PRD is：COMP ＞ 50%PRD, the present embodiment provides two further
A kind of physical relationship of person, is COMP=60%PRD.
Control device embodiment
In the present embodiment, the control device solving the distortion of space vector pulse width modulation current zero-crossing point includes two parts：Adopt
Collection module and control module, wherein,
Acquisition module is used for gathering the phase voltage of each phase；
Control module is used for judging phase voltage to pass through during zero point to be positive going zeror crossing or negative sense zero passage, when phase voltage forward direction mistake
When zero, corresponding positive and negative carrier switch point is arranged on COMP～PRD；When phase voltage negative sense zero passage, corresponding positive and negative carrier wave
Switching point is arranged on 0～COMP.
By to above-mentioned two module analysis, this control device is still substantially control method, due to above-mentioned control
This control method is made that in embodiment of the method processed and describes in detail, just no longer illustrate here.
It is presented above specific embodiment, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter do not need to spend creative work.Right without departing from the principles and spirit of the present invention
Change, modification, replacement and modification that embodiment is carried out still fall within protection scope of the present invention.
Claims (8)
1. a kind of control method solving the distortion of space vector pulse width modulation current zero-crossing point is it is characterised in that include following walking
Suddenly：
(1) gather the phase voltage of each phase；
(2) judging phase voltage to pass through during zero point is positive going zeror crossing or negative sense zero passage, when phase voltage positive going zeror crossing, positive and negative load
Ripple switching point is arranged on COMP～PRD；When phase voltage negative sense zero passage, positive and negative carrier switch point is arranged on 0～COMP.
2. the control method solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 1, its feature
It is,
The Rule of judgment that A phase voltage Va forward direction passes through zero point is：Va instantaneous value close to zero, Vb instantaneous value close to Vm*sin60 °, Vc
Close-Vm*sin60 ° of instantaneous value；The Rule of judgment that B phase voltage Vb forward direction passes through zero point is：Vb instantaneous value is instantaneous close to zero, Vc
It is worth close to Vm*sin60 °, close-Vm*sin60 ° of Va instantaneous value；The Rule of judgment that C phase voltage Vc forward direction passes through zero point is：Vc wink
Duration close to zero, Va instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Vb instantaneous value；
The Rule of judgment that A phase voltage Va negative sense passes through zero point is：Close-Vm*sin60 ° close to zero, Vb instantaneous value of Va instantaneous value,
Vc instantaneous value is close to Vm*sin60 °；The Rule of judgment that B phase voltage Vb negative sense passes through zero point is：Vb instantaneous value is instantaneous close to zero, Vc
Close-Vm*sin60 ° of value, Va instantaneous value is close to Vm*sin60 °；The Rule of judgment that C phase voltage Vc negative sense passes through zero point is：Vc wink
Close-Vm*sin60 ° close to zero, Va instantaneous value of duration, Vb instantaneous value is close to Vm*sin60 °；Wherein Vm is the amplitude of phase voltage.
3. the control method solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 1, its feature
It is,
Relation between COMP and PRD is：COMP ＞ 50%PRD.
4. the control method solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 3, its feature
It is,
Described COMP=60%PRD.
5. a kind of control device solving the distortion of space vector pulse width modulation current zero-crossing point is it is characterised in that include：
Acquisition module, for gathering the phase voltage of each phase；
Control module, is positive going zeror crossing or negative sense zero passage for judging phase voltage to pass through during zero point, when phase voltage positive going zeror crossing
When, positive and negative carrier switch point is arranged on COMP～PRD；When phase voltage negative sense zero passage, positive and negative carrier switch point is arranged on 0～
COMP.
6. the control device solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 5, its feature
It is,
The Rule of judgment that A phase voltage Va forward direction passes through zero point is：Va instantaneous value close to zero, Vb instantaneous value close to Vm*sin60 °, Vc
Close-Vm*sin60 ° of instantaneous value；The Rule of judgment that B phase voltage Vb forward direction passes through zero point is：Vb instantaneous value is instantaneous close to zero, Vc
It is worth close to Vm*sin60 °, close-Vm*sin60 ° of Va instantaneous value；The Rule of judgment that C phase voltage Vc forward direction passes through zero point is：Vc wink
Duration close to zero, Va instantaneous value close to Vm*sin60 °, close-Vm*sin60 ° of Vb instantaneous value；
The Rule of judgment that A phase voltage Va negative sense passes through zero point is：Close-Vm*sin60 ° close to zero, Vb instantaneous value of Va instantaneous value,
Vc instantaneous value is close to Vm*sin60 °；The Rule of judgment that B phase voltage Vb negative sense passes through zero point is：Vb instantaneous value is instantaneous close to zero, Vc
Close-Vm*sin60 ° of value, Va instantaneous value is close to Vm*sin60 °；The Rule of judgment that C phase voltage Vc negative sense passes through zero point is：Vc wink
Close-Vm*sin60 ° close to zero, Va instantaneous value of duration, Vb instantaneous value is close to Vm*sin60 °；Wherein Vm is the amplitude of phase voltage.
7. the control device solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 5, its feature
It is,
Relation between COMP and PRD is：COMP ＞ 50%PRD.
8. the control device solving the distortion of space vector pulse width modulation current zero-crossing point according to claim 7, its feature
It is,
Described COMP=60%PRD.
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