CN110391726A - Unidirectional three-phase star connects the suppressing method of controlled rectifier input current Zero-crossing Distortion - Google Patents
Unidirectional three-phase star connects the suppressing method of controlled rectifier input current Zero-crossing Distortion Download PDFInfo
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- CN110391726A CN110391726A CN201910680629.8A CN201910680629A CN110391726A CN 110391726 A CN110391726 A CN 110391726A CN 201910680629 A CN201910680629 A CN 201910680629A CN 110391726 A CN110391726 A CN 110391726A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
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Abstract
The present invention provides the suppressing methods that a kind of unidirectional three-phase star based on modulating wave compensation connects controlled rectifier input current Zero-crossing Distortion, belong to power electronic technique, generation of electricity by new energy and smart grid research field.Specifically includes the following steps: obtaining three-phase modulations wave voltage by Double closed-loop of voltage and current first, then the maximum value and minimum value of three-phase modulations wave voltage in each moment is calculated, maxima and minima is added, modulation wave voltage as compensation, it is added on former three-phase modulations wave voltage, new three-phase modulations wave voltage is generated, hands over and cuts with triangular carrier, finally obtain PWM wave driving switch pipe.Compared with the conventional method, the modulation wave voltage compensated in the present invention can obtain in real time, calculation amount is small, high reliablity, as long as the controller of Voltage loop and electric current loop is stablized, it can be eliminated by adjusting modulation wave voltage in real time or inhibit input current Zero-crossing Distortion, realize lag, the operation of advanced and unity power factor in a certain range.
Description
Technical field
The invention belongs to power electronic technique, generation of electricity by new energy and smart grid research field, in particular to energy is unidirectional
The three-phase star of flowing connects the elimination or inhibition of controlled rectifier input current Zero-crossing Distortion.
Background technique
In considerable practical application in industry, electric energy does not need to transmit in both direction, such as blower, pumping motor
Energy-saving speed regulating controls power supply, communication power supply, electric power power switch, electric car charge power supply etc..Therefore, energy folk prescription in recent years
It is received significant attention to the controlled rectifier of flowing in power electronics field.With the controllable current transformer phase of energy in bidirectional flow
Compare, less wholly-controled device can be used in the rectifier of energy one-way flow, has relatively simple control circuit, higher
System stability and lower production cost, shown apparent application advantage.Wherein, the three of energy one-way flow
Phase controlled rectifier receives more passes because that can use with high power density and high efficiency in high-power applications field
Note, application and control technology have obtained significant progress in recent decades.
But in the controlled rectifier of many energy one-way flows, as three-phase star connects no bridge rectifier, three-phase VIENNA
Rectifier and all stars connect cascade connection type three-phase controlled rectifier topology, due to the presence of input side inductance, so that in certain periods
It is required that input current it is given with generate this and exchange side relative to the voltage between mains neutral point to constant current is required
Polarity must on the contrary, however the circuit characteristic of the controlled rectifier due to one-way flow, input current it is given with generate this
Must be identical relative to the polarity of the voltage between mains neutral point to exchange side required for constant current, to produce uncontrollable
Region, thus the input current of the controlled rectifier of energy one-way flow can be distorted in input current near zero-crossing point, but
It is some suitable angle when inductive current lag supply voltage (angle depends on inductance value and load current size)
When, input current can be run with sinusoidal waveform, therefore when the controlled rectifier of energy one-way flow is with lagging power-factor
When (lag angle is not equal to above-mentioned suitable angle), leading power factor or unity power factor are run, electric current is in zero crossing
Nearby can all generate distortion, thus caused by harmonic pollution in electric power net, system stability decline and operational efficiency reduction the problems such as all
It seriously constrains the development of the controlled rectifier of energy one-way flow and in larger range of application, and current distortion problem is in energy
It is especially prominent in the three-phase controlled rectifier of amount one-way flow, because the Zero-crossing Distortion of each phase current can all make other two-phase electricity
Stream also generates corresponding distortion, thus the harm for expanding current distortion at double simultaneously.It is therefore proposed that one kind can be solved effectively
The certainly three-phase controlled rectifier current over-zero aberration problems of energy one-way flow, and can be easy to use in actual application
Control strategy is of great significance.
The object of the present invention is to provide a kind of calculation amount is small, high reliablity can be in lag, advanced, unity power factor
Under suppress or eliminate the method for three-phase input current Zero-crossing Distortion.
Summary of the invention
In order to achieve the above objectives, a kind of unidirectional three-phase star based on modulating wave compensation provided by the invention connects controlled rectifier
The suppressing method of input current Zero-crossing Distortion, which comprises the following steps:
Step 1: to three-phase power grid voltage ua、ub、ucIt is sampled, using the decoupling software phase-lock loop of double synchronous coordinate systems
(DDSRF-SPLL), locking phase is carried out to power grid, obtains the angle, θ of network voltage, and to three-phase power grid voltage carry out Clark,
Park coordinate transform obtains the sampled value u of voltage under two-phase rotating coordinate systemd、uq；To three phase network electric current ia、ib、icIt is adopted
Sample, and Clark, Park coordinate transform are carried out, obtain the sampled value i of electric current under two-phase rotating coordinate systemd、iq；By DC voltage
Instruction value udc *The average value u of total DC capacitor voltage with three-phasedc_aveIt makes the difference, the difference of generation passes through PI controller, obtains
Amplitude i of the call instruction electric current under d axis coordinate systemd *, and according to required three-phase star connect the provided power of controlled rectifier because
Number angle θ obtains amplitude i of the instruction current under q axis coordinate systemq *, wherein iq *=id*tanθ；By the sampled value i of actual currentd、
iqWith given value id*、iq* it is poor to make, and using feed forward control method to idAnd iqDecoupling control is carried out, three-phase modulations wave voltage is obtained
Component u on d axis and q axiscond *、uconq *, and pass through iPark, iClark coordinate transform, obtain three-phase modulations wave voltage
ucona *、uconb *、uconc *；
Step 2: three-phase modulations wave voltage u in each moment is calculatedcona *、uconb *、uconc *Maximum value and minimum
Value, maxima and minima is added, the modulation wave voltage u as compensationrevise *, and by former three-phase modulations wave voltage ucona *、
uconb *、uconc *Respectively with the modulation wave voltage u of compensationrevise *It is added, generates new three-phase modulations wave voltage unewa *、unewb *、
unewc *；
Step 3: by modulation wave voltage u new obtained in step 2newa *、unewb *、unewc *Respectively divided by DC side electricity
Press instruction value udc *, and take absolute value, with amplitude be 1 and frequency is fsTriangular carrier hand over and cut, it is each to obtain the driving of PWM wave signal
Switching tube on phase bridge arm.
Compared with prior art, the present invention its remarkable advantage is: the modulation wave voltage of compensation can obtain in real time, calculation amount
It is small, high reliablity, as long as the controller of Voltage loop and electric current loop is stablized, can by adjust in real time modulation wave voltage eliminating or
Inhibit unidirectional three-phase star to connect controlled rectifier input current Zero-crossing Distortion, unidirectional three-phase star is allow to connect controlled rectifier certain
Lag, the operation of advanced and unity power factor are realized in range, meet the requirement of power grid and electrical equipment to harmonic standard.
It is described in detail below in conjunction with embodiment referring to attached drawing.
Detailed description of the invention
Fig. 1 is that the unidirectional three-phase star of phase voltage tandem type connects controlled rectifier topological structure；
Fig. 2 is that the unidirectional three-phase star of phase voltage tandem type connects whole control knot of the controlled rectifier under dq rotating coordinate system
Structure；
Fig. 3 is that three-phase star connects VIENNA rectifier topological structure；
Fig. 4 is that three-phase star used in the implementation case connects no bridge rectifier topological structure；
Fig. 5 is the waveform of the three-phase modulations wave voltage and three-phase input current before compensating under lagging power-factor；
Fig. 6 is the waveform of compensated three-phase modulations wave voltage and three-phase input current under lagging power-factor；
Fig. 7 is after the A phase before compensation modulates wave voltage and input current waveform, the modulating wave voltage waveform of compensation and compensation
A phase modulate wave voltage and input current waveform；
Fig. 8 is voltage wave by low-pass filter after of the exchange side neutral point before compensation relative to mains neutral point
Shape；
Fig. 9 is voltage wave by low-pass filter after of the compensated exchange side neutral point relative to mains neutral point
Shape；
Figure 10 is wave of the three-phase alternating current side relative to the voltage between mains neutral point after low-pass filter before compensation
Shape；
Figure 11 is wave of the compensated three-phase alternating current side relative to the voltage between mains neutral point after low-pass filter
Shape；
Figure 12 is the waveform that three-phase input voltage and input current is compensated under lagging power-factor；
Figure 13 is the waveform of three-phase input voltage electric current after compensating under lagging power-factor；
Figure 14 is the THD analysis of compensation front and back A phase current under lagging power-factor；
Figure 15 is the waveform that three-phase input voltage and input current is compensated under leading power factor；
Figure 16 is the waveform of three-phase input voltage electric current after compensating under leading power factor；
Figure 17 is the THD analysis of compensation front and back A phase current under leading power factor；
Figure 18 is the waveform that three-phase input voltage and input current is compensated under unit power factor；
Figure 19 is the waveform of three-phase input voltage electric current after compensating under unit power factor；
Figure 20 is the THD analysis of compensation front and back A phase current under unit power factor.
Specific embodiment
With reference to the accompanying drawings and detailed description by taking three-phase star shown in Fig. 4 connects no bridge rectifier as an example, to the present invention
It is described further.
Step 1: to three-phase power grid voltage ua、ub、ucIt is sampled, using the decoupling software phase-lock loop of double synchronous coordinate systems
(DDSRF-SPLL), locking phase is carried out to power grid, obtains the angle, θ of network voltage, and to three-phase power grid voltage carry out Clark,
Park coordinate transform obtains the sampled value u of voltage under two-phase rotating coordinate systemd、uq；To three phase network electric current ia、ib、icIt is adopted
Sample, and Clark, Park coordinate transform are carried out, obtain the sampled value i of electric current under two-phase rotating coordinate systemd、iq；By each module
DC voltage instruction value udc *The average value u of total DC capacitor voltage with three-phasedc_aveIt makes the difference, the difference of generation passes through PI
Controller obtains amplitude i of the instruction current under d axis coordinate systemd *, and connect controlled rectifier according to required three-phase star and mentioned
Amplitude i of the instruction current under q axis coordinate system is obtained for power-factor angle θq *, wherein iq *=id*tanθ；By adopting for actual current
Sample value id、iqWith given value id*、iq* it is poor to make, and using feed forward control method to idAnd iqDecoupling control is carried out, three-phase tune is obtained
Component u of the wave voltage processed on d axis and q axiscond *、uconq *, and pass through iPark, iClark coordinate transform, obtain three-phase modulations
Wave voltage ucona *、uconb *、uconc *；
Step 2: the basic reason that unidirectional three-phase star connects controlled rectifier input current abnormality is since it modulates wave voltage
Polarity is on the contrary, to producing uncontrollable region in a certain region with input current, in order to reduce uncontrollable region as far as possible,
By the way that three-phase modulations wave voltage u in each moment is calculatedcona *、uconb *、uconc *Maximum value and minimum value, by maximum value
It is added with minimum value, the modulation wave voltage u as compensationrevise *, and by former three-phase modulations wave voltage ucona *、uconb *、uconc *Point
Not with the modulation wave voltage u of compensationrevise *It is added, generates new three-phase modulations wave voltage unewa *、unewb *、unewc *, originally at this time
The three-phase modulations wave voltage in uncontrollable region will become zero；
Step 3: by modulation wave voltage u new obtained in step 2newa *、unewb *、unewc *Respectively divided by DC side electricity
Press instruction value udc *, and take absolute value, with amplitude be 1 and frequency is fsTriangular carrier hand over and cut, it is each to obtain the driving of PWM wave signal
Switching tube on phase bridge arm, voltage u of the side neutral point of rectifier exchange at this time relative to mains neutral pointNO *Low frequency component then
For the modulation wave voltage u of compensationrevise *, the input terminal of rectified three-phase circuit and inductance connection is to three phase mains mid-point voltage uAN、
uBN、uCNFundametal compoment can follow its given value u alwaysAN *、uBN *、uCN *Variation, to reach elimination or inhibit three-phase defeated
Enter the purpose of current over-zero distortion.
Embodiment: analysis of simulation result.
Three-phase star is built in MATLAB/Simulink and connects no bridge rectifier model, and simulation parameter is as follows: three-phase alternating current is defeated
Entering voltage is 380V, and every phase DC output voltage is 500V, 50 Ω of load resistance, triangular carrier frequency fsFor 10kHz.Fig. 5 is
Under lagging power-factor compensate before three-phase modulations wave voltage and three-phase input current waveform, at this time three-phase modulations wave voltage with
There are opposite polarity region (uncontrollable region) between input current, Fig. 6 is compensated three-phase tune under lagging power-factor
The three-phase modulations wave voltage of the waveform of wave voltage processed and three-phase input current, uncontrollable region original at this time becomes 0.Fig. 7 is
A phase before compensation modulates wave voltage and input current waveform, the modulating wave voltage waveform of compensation and compensated A phase modulating wave electricity
Pressure and input current waveform, it can be seen that the amplitude of the modulation wave voltage of compensation is exactly modulating wave electricity when uncontrollable region occurs
The amplitude of pressure, and the trough of the modulation wave voltage compensated corresponds to the angle in positive half period at the end of uncontrollable region, such as point A,
The wave crest of the modulation wave voltage of compensation corresponds to the angle in negative half-cycle at the end of uncontrollable region, such as point B.Fig. 8 is before compensating
Exchange side neutral point relative to mains neutral point voltage by cutoff frequency be 10000 π second-order low-pass filter after
Waveform, Fig. 9 be it is compensated exchange side neutral point relative to mains neutral point voltage by cutoff frequency be the two of 10000 π
Waveform after rank low-pass filter, it can be seen that low frequency minute of the side neutral point relative to the voltage of mains neutral point is exchanged after compensation
Amount is then the modulating wave voltage waveform of compensation.Figure 10 is that the three-phase alternating current side before compensation is passed through relative to the voltage between mains neutral point
Waveform after crossing the second-order low-pass filter that cutoff frequency is 10000 π, Figure 11 are compensated three-phase alternating current side relative to power supply
Waveform of the voltage after cutoff frequency is the second-order low-pass filter of 10000 π between neutral point, it can be seen that compensated three
Commutating phase device three-phase alternating current side is approximately sinusoidal waveform relative to the voltage between mains neutral point.Figure 12 is under lagging power-factor
The waveform of three-phase input voltage and input current is compensated, Figure 13 is the wave of three-phase input voltage electric current after compensating under lagging power-factor
Shape, Figure 14 are the THD analysis of compensation front and back A phase current under lagging power-factor；Figure 15 is to compensate first three under leading power factor
The waveform of phase input voltage and input current, Figure 16 are the waveform of three-phase input voltage electric current after compensating under leading power factor, Tu17Wei
The THD analysis of compensation front and back A phase current under leading power factor；Figure 18 is that three-phase input voltage is compensated under unit power factor
The waveform of electric current, Figure 19 be unit power factor under compensate after three-phase input voltage electric current waveform, Figure 20 be unit power because
The THD analysis of A phase current before and after several lower compensation；It can be seen that compensation after, eliminate or inhibit three-phase star connect no bridge rectifier with
Input current Zero-crossing Distortion when lagging power-factor, leading power factor, unity power factor operation, and three-phase is defeated after compensation
The triple-frequency harmonics content for entering electric current has to be increased by a small margin, but quintuple harmonics, the seventh harmonic content greatly reduce.
It can be seen that from above embodiments, energy one-way flow can be effectively eliminated or inhibited using method proposed by the present invention
Dynamic three-phase star connects the Zero-crossing Distortion of controlled rectifier input current.
Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (1)
1. a kind of unidirectional three-phase star based on modulating wave compensation connects the suppressing method of controlled rectifier input current Zero-crossing Distortion,
It is characterized in that, comprising the following steps:
Step 1: to three-phase power grid voltage ua、ub、ucIt is sampled, using the decoupling software phase-lock loop of double synchronous coordinate systems
(DDSRF-SPLL), locking phase is carried out to power grid, obtains the angle, θ of network voltage, and to three-phase power grid voltage carry out Clark,
Park coordinate transform obtains the sampled value u of voltage under two-phase rotating coordinate systemd、uq；To three phase network electric current ia、ib、icIt is adopted
Sample, and Clark, Park coordinate transform are carried out, obtain the sampled value i of electric current under two-phase rotating coordinate systemd、iq；By DC voltage
Instruction value udc *The average value u of total DC capacitor voltage with three-phasedc_aveIt makes the difference, the difference of generation passes through PI controller, obtains
Amplitude i of the call instruction electric current under d axis coordinate systemd *, and according to required three-phase star connect the provided power of controlled rectifier because
Number angle θ obtains amplitude i of the instruction current under q axis coordinate systemq *, wherein iq *=id*tanθ；By the sampled value i of actual currentd、
iqWith given value id*、iq* it is poor to make, and using feed forward control method to idAnd iqDecoupling control is carried out, three-phase modulations wave voltage is obtained
Component u on d axis and q axiscond *、uconq *, and pass through iPark, iClark coordinate transform, obtain three-phase modulations wave voltage
ucona *、uconb *、uconc *；
Step 2: three-phase modulations wave voltage u in each moment is calculatedcona *、uconb *、uconc *Maximum value and minimum value, will
Maxima and minima is added, the modulation wave voltage u as compensationrevise *, and by former three-phase modulations wave voltage ucona *、uconb *、
uconc *Respectively with the modulation wave voltage u of compensationrevise *It is added, generates new three-phase modulations wave voltage unewa *、unewb *、unewc *；
Step 3: by modulation wave voltage u new obtained in step 2newa *、unewb *、unewc *Refer to respectively divided by DC voltage
Enable value udc *, and take absolute value, with amplitude be 1 and frequency is fsTriangular carrier hand over and cut, obtain PWM wave signal and drive each phase bridge
Switching tube on arm.
Compared with prior art, the present invention its remarkable advantage is: the modulation wave voltage of compensation can obtain in real time, and calculation amount is small,
High reliablity can be eliminated or press down by adjusting modulation wave voltage in real time as long as the controller of Voltage loop and electric current loop is stablized
It makes unidirectional three-phase star and connects controlled rectifier input current Zero-crossing Distortion, unidirectional three-phase star is allow to connect controlled rectifier in certain model
Interior realization lag, the operation of advanced and unity power factor are enclosed, the requirement of power grid and electrical equipment to harmonic standard is met.
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| CN201910680629.8A CN110391726B (en) | 2019-07-26 | 2019-07-26 | Method for inhibiting zero-crossing distortion of input current of unidirectional three-phase star-connected controllable rectifier |
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| CN112436743A (en) * | 2020-12-10 | 2021-03-02 | 江苏鑫通汽车部件有限公司 | Method for eliminating VIENNA rectifier current zero crossing distortion |
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| CN110391726B (en) | 2020-05-26 |
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