CN110391726B - Method for inhibiting zero-crossing distortion of input current of unidirectional three-phase star-connected controllable rectifier - Google Patents

Method for inhibiting zero-crossing distortion of input current of unidirectional three-phase star-connected controllable rectifier Download PDF

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CN110391726B
CN110391726B CN201910680629.8A CN201910680629A CN110391726B CN 110391726 B CN110391726 B CN 110391726B CN 201910680629 A CN201910680629 A CN 201910680629A CN 110391726 B CN110391726 B CN 110391726B
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phase
voltage
wave voltage
modulated wave
current
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CN110391726A (en
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程红
王聪
陈婷
赵志浩
管应玉
李治
卢其威
邹甲
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China University of Mining and Technology Beijing CUMTB
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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
    • 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
    • H02M7/02—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
    • 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

Abstract

The invention provides a method for inhibiting zero-crossing distortion of input current of a unidirectional three-phase star-connected controllable rectifier based on modulated wave compensation, and belongs to the field of power electronic technology, new energy power generation and intelligent power grid research. The method specifically comprises the following steps: firstly, voltage and current double closed loop control is carried out to obtain three-phase modulated wave voltage, then the maximum value and the minimum value of the three-phase modulated wave voltage at each moment are calculated, the maximum value and the minimum value are added to be used as compensated modulated wave voltage, the compensated modulated wave voltage is superposed on the original three-phase modulated wave voltage to generate new three-phase modulated wave voltage, the new three-phase modulated wave voltage is intersected with a triangular carrier wave, and finally the PWM wave driving switch tube is obtained. Compared with the prior art, the compensated modulation wave voltage can be obtained in real time, the calculated amount is small, the reliability is high, the zero-crossing distortion of the input current can be eliminated or restrained by adjusting the modulation wave voltage in real time as long as the controllers of the voltage loop and the current loop are stable, and the operation of lag, lead and unit power factor can be realized in a certain range.

Description

Method for inhibiting zero-crossing distortion of input current of unidirectional three-phase star-connected controllable rectifier
Technical Field
The invention belongs to the field of power electronic technology, new energy power generation and intelligent power grid research, and particularly relates to elimination or inhibition of zero-crossing distortion of input current of a three-phase star-connected controllable rectifier with unidirectional energy flow.
Background
In a considerable number of practical industrial applications, electric energy does not need to be transmitted in two directions, such as a fan, a pump motor energy-saving speed-regulating control power supply, a communication power supply, an electric power switching-on power supply, an electric vehicle charging power supply and the like. Therefore, in recent years, a controllable rectifier with unidirectional energy flow has attracted much attention in the field of power electronics. Compared with a controllable converter with energy flowing in two directions, the rectifier with energy flowing in one direction can use fewer fully-controlled devices, has a relatively simple control circuit, higher system stability and lower production cost, and shows obvious application advantages. Among them, the three-phase controllable rectifier with unidirectional energy flow has received much attention because it can be used in high power application field with high power density and high efficiency, and its application and control technology have been developed in the last decades.
However, in many energy unidirectional flow controllable rectifiers, such as three-phase star-connected bridgeless rectifiers, three-phase VIENNA rectifiers and all star-connected cascade type three-phase controllable rectifier topologies, due to the presence of the input side inductor, the polarity of the voltage between the ac side required for generating the given current and the voltage between the ac side required for generating the given current must be opposite in some time period, however, due to the circuit characteristics of the unidirectional flow controllable rectifiers, the polarity of the input current and the polarity of the voltage between the ac side required for generating the given current and the voltage between the power neutral points must be the same, so that an uncontrollable area is generated, and thus the input current of the energy unidirectional flow controllable rectifiers is distorted near the zero crossing point of the input current, but when the inductor current lags behind the power voltage by a proper angle (which depends on the inductance value and the magnitude of the load current), the input current can only operate in a sine wave shape, so when the controllable rectifier with unidirectional energy flow operates in a lagging power factor (the lagging angle is not equal to the proper angle), a leading power factor or a unit power factor, the current is distorted near a zero crossing point, so that the development and the application in a wider range of the controllable rectifier with unidirectional energy flow are seriously restricted by the problems of power grid harmonic pollution, system stability reduction, operation efficiency reduction and the like, and the current distortion problem is particularly prominent in the three-phase controllable rectifier with unidirectional energy flow because the zero crossing distortion of each phase current can simultaneously generate corresponding distortion on the other two phases of current, so that the damage of current distortion is multiplied. Therefore, the control strategy which can effectively solve the problem of zero-crossing distortion of the three-phase controllable rectifier with unidirectional energy flow and is convenient to use in practical application occasions has important significance.
The invention aims to provide a method which has small calculation amount and high reliability and can inhibit or eliminate the zero-crossing distortion of three-phase input current under the conditions of lag, lead and unit power factor.
Disclosure of Invention
In order to achieve the above object, the present invention provides a method for suppressing zero-crossing distortion of input current of a unidirectional three-phase star-connected controllable rectifier based on modulated wave compensation, which is characterized by comprising the following steps:
the method comprises the following steps: for three-phase network voltage ua、ub、ucSampling, adopting a decoupling software phase-locked loop (DDSRF-SPLL) of a double synchronous coordinate system to phase-lock the power grid to obtain an angle theta of the power grid voltage, and performing Clark and Park coordinate transformation on the three-phase power grid voltage to obtain a sampling value u of the voltage under a two-phase rotating coordinate systemd、uq(ii) a For three-phase network current ia、ib、icSampling, and performing Clark and Park coordinate transformation to obtain a sampling value i of the current under a two-phase rotating coordinate systemd、iq(ii) a The DC side voltage command value udc *Average value u of DC side capacitor voltage of three phasesdc_aveMaking a difference, and obtaining the amplitude i of the command current under a d-axis coordinate system by the generated difference through a PI (proportional integral) controllerd *And obtaining the amplitude i of the command current in a q-axis coordinate system according to the required power factor angle theta provided by the three-phase star-connected controllable rectifierq *Wherein iq *＝idTan θ; sampling value i of actual currentd、iqWith a given value id*、iqMaking difference and adopting feedforward control method to make differencedAnd iqDecoupling control is carried out to obtain components u of the three-phase modulation wave voltage on the d axis and the q axiscond *、uconq *And obtaining three-phase modulation wave voltage u through iPark and iClark coordinate transformationcona *、uconb *、uconc *；
Step two: the three-phase modulation wave voltage u in each moment is obtained by calculationcona *、uconb *、uconc *Is the most important ofLarge and minimum values, adding the maximum and minimum values as compensated modulated wave voltage urevise *And the original three-phase modulated wave voltage u is converted into the three-phase modulated wave voltagecona *、uconb *、uconc *Modulated wave voltage u separately compensatedrevise *Adding to generate new three-phase modulated wave voltage unewa *、unewb *、unewc *；
Step three: the new modulated wave voltage u obtained in the step twonewa *、unewb *、unewc *Divided by the DC-side voltage command value udc *And taking the absolute value, with the amplitude of 1 and the frequency of fsThe triangular carrier waves are intercepted to obtain PWM wave signals to drive the switching tubes on the bridge arms of all phases.
Compared with the prior art, the invention has the following remarkable advantages: the compensated modulation wave voltage can be obtained in real time, the calculated amount is small, the reliability is high, and as long as the controllers of the voltage loop and the current loop are stable, the zero-crossing distortion of the input current of the unidirectional three-phase star-connected controllable rectifier can be eliminated or inhibited by adjusting the modulation wave voltage in real time, so that the unidirectional three-phase star-connected controllable rectifier can realize lag, lead and unit power factor operation in a certain range, and the requirements of a power grid and electric equipment on harmonic standards are met.
The following detailed description is made with reference to the accompanying drawings in conjunction with the embodiments.
Drawings
FIG. 1 is a topological structure of a phase voltage cascade type one-way three-phase star connection controllable rectifier;
FIG. 2 is an overall control structure of a phase voltage cascade type one-way three-phase star connection controllable rectifier under a dq rotation coordinate system;
FIG. 3 is a three-phase star-connected VIENNA rectifier topology;
FIG. 4 is a three-phase star-connected bridgeless rectifier topology used in this embodiment;
FIG. 5 is a waveform of three-phase modulated wave voltage and three-phase input current before compensation under lagging power factor;
FIG. 6 is a diagram showing the waveforms of three-phase modulated wave voltage and three-phase input current after compensation under a hysteresis power factor;
FIG. 7 shows the voltage and input current waveforms of the A-phase modulated wave before compensation, the voltage waveform of the compensated modulated wave, and the voltage and input current waveforms of the A-phase modulated wave after compensation;
FIG. 8 is a waveform of the AC side neutral point voltage with respect to the power supply neutral point voltage after low pass filtering before compensation;
FIG. 9 is a waveform of the compensated AC side neutral point voltage with respect to the power supply neutral point after passing through a low pass filter;
FIG. 10 is a waveform of a voltage between a neutral point of a power supply and a three-phase AC side before compensation after passing through a low-pass filter;
FIG. 11 is a waveform of a compensated three-phase AC side through a low pass filter with respect to a voltage between neutral points of a power supply;
FIG. 12 is a waveform of three-phase input voltage current before compensation at hysteretic power factor;
FIG. 13 is a waveform of compensated three-phase input voltage current at hysteretic power factor;
FIG. 14 is a THD analysis of phase A current before and after compensation at hysteretic power factor;
FIG. 15 is a waveform of three-phase input voltage current before compensation at lead power factor;
FIG. 16 is a waveform of compensated three-phase input voltage current at lead power factor;
FIG. 17 is a THD analysis of phase A current before and after compensation at lead power factor;
FIG. 18 is a waveform of three-phase input voltage current before compensation at unity power factor;
FIG. 19 is a waveform of compensated three-phase input voltage current at unity power factor;
fig. 20 is a THD analysis of a phase a current before and after compensation at a unit power factor.
Detailed Description
The invention will be further explained by taking the three-phase star-connected bridgeless rectifier shown in fig. 4 as an example with reference to the accompanying drawings and the detailed description.
The method comprises the following steps: for three-phase network voltage ua、ub、ucSampling, adopting a decoupling software phase-locked loop (DDSRF-SPLL) of a double synchronous coordinate system to phase-lock the power grid to obtain an angle theta of the power grid voltage, and performing Clark and Park coordinate transformation on the three-phase power grid voltage to obtain a sampling value u of the voltage under a two-phase rotating coordinate systemd、uq(ii) a For three-phase network current ia、ib、icSampling, and performing Clark and Park coordinate transformation to obtain a sampling value i of the current under a two-phase rotating coordinate systemd、iq(ii) a The direct current side voltage instruction value u of each moduledc *Average value u of DC side capacitor voltage of three phasesdc_aveMaking a difference, and obtaining the amplitude i of the command current under a d-axis coordinate system by the generated difference through a PI (proportional integral) controllerd *And obtaining the amplitude i of the command current in a q-axis coordinate system according to the required power factor angle theta provided by the three-phase star-connected controllable rectifierq *Wherein iq *＝idTan θ; sampling value i of actual currentd、iqWith a given value id*、iqMaking difference and adopting feedforward control method to make differencedAnd iqDecoupling control is carried out to obtain components u of the three-phase modulation wave voltage on the d axis and the q axiscond *、uconq *And obtaining three-phase modulation wave voltage u through iPark and iClark coordinate transformationcona *、uconb *、uconc *；
Step two: the fundamental reason of the distortion of the input current of the unidirectional three-phase star-connected controllable rectifier is that the modulated wave voltage and the input current have opposite polarities in a certain area, so that an uncontrollable area is generated, and in order to reduce the uncontrollable area as much as possible, the three-phase modulated wave voltage u in each moment is obtained by calculationcona *、uconb *、uconc *Is added to the minimum value as the compensated modulated wave voltage urevise *And the original three-phase modulated wave is combinedVoltage ucona *、uconb *、uconc *Modulated wave voltage u separately compensatedrevise *Adding to generate new three-phase modulated wave voltage unewa *、unewb *、unewc *At the moment, the voltage of the original three-phase modulation wave in the uncontrollable area becomes zero;
step three: the new modulated wave voltage u obtained in the step twonewa *、unewb *、unewc *Divided by the DC-side voltage command value udc *And taking the absolute value, with the amplitude of 1 and the frequency of fsThe triangular carrier wave is intercepted to obtain PWM wave signals to drive the switch tubes on each phase of bridge arms, and the voltage u of the neutral point on the AC side of the rectifier relative to the neutral point of the power supply at the momentNO *The low-frequency component of (b) is the compensated modulated wave voltage urevise *The input end of the three-phase rectifying circuit connected with the inductor is connected with the midpoint voltage u of the three-phase power supplyAN、uBN、uCNCan always follow its given value uAN *、uBN *、uCN *And the distortion of the zero crossing of the three-phase input current is eliminated or restrained.
Example (b): and (5) analyzing a simulation result.
A three-phase star-connected bridgeless rectifier model is built in MATLAB/Simulink, and simulation parameters are as follows: 380V of three-phase alternating-current input voltage, 500V of direct-current output voltage of each phase, 50 omega of load resistance and triangular carrier frequency fsIs 10 kHz. Fig. 5 shows waveforms of the three-phase modulated wave voltage and the three-phase input current before compensation in the hysteresis power factor, in which a region (uncontrollable region) having an opposite polarity exists between the three-phase modulated wave voltage and the input current, and fig. 6 shows waveforms of the three-phase modulated wave voltage and the three-phase input current after compensation in the hysteresis power factor, in which the three-phase modulated wave voltage in the original uncontrollable region is changed to 0. FIG. 7 shows the waveform of the A-phase modulated wave voltage and the input current before compensation, the waveform of the compensated modulated wave voltage, and the waveform of the A-phase modulated wave voltage and the input current after compensationIt can be seen that the amplitude of the compensated modulated wave voltage is exactly the amplitude of the modulated wave voltage when the uncontrollable region appears, and the valley of the compensated modulated wave voltage corresponds to the angle at which the uncontrollable region ends within the positive half period, such as point a, and the peak of the compensated modulated wave voltage corresponds to the angle at which the uncontrollable region ends within the negative half period, such as point B. Fig. 8 is a waveform of the voltage of the ac neutral point with respect to the power supply neutral point before compensation after passing through a second-order low-pass filter having a cutoff frequency of 10000 pi, and fig. 9 is a waveform of the voltage of the ac neutral point with respect to the power supply neutral point after compensation after passing through a second-order low-pass filter having a cutoff frequency of 10000 pi. Fig. 10 shows a waveform of the voltage between the three-phase ac side and the neutral point of the power supply before compensation after passing through a second-order low-pass filter having a cutoff frequency of 10000 pi, and fig. 11 shows a waveform of the voltage between the three-phase ac side and the neutral point of the power supply after compensation after passing through a second-order low-pass filter having a cutoff frequency of 10000 pi. Fig. 12 is a waveform of three-phase input voltage current before compensation at a hysteresis power factor, fig. 13 is a waveform of three-phase input voltage current after compensation at a hysteresis power factor, and fig. 14 is a THD analysis of a phase current before and after compensation at a hysteresis power factor; fig. 15 is a waveform of three-phase input voltage current before compensation at a leading power factor, fig. 16 is a waveform of three-phase input voltage current after compensation at a leading power factor, and fig. 17 is a THD analysis of a phase current before and after compensation at a leading power factor; fig. 18 is a waveform of three-phase input voltage current before compensation at a unit power factor, fig. 19 is a waveform of three-phase input voltage current after compensation at a unit power factor, and fig. 20 is a THD analysis of a phase current before and after compensation at a unit power factor; after compensation, the zero-crossing distortion of the input current when the three-phase star-connected bridgeless rectifier runs by a lag power factor, a lead power factor and a unit power factor is eliminated or restrained, the third harmonic content of the three-phase input current after compensation is increased by a small amplitude, and the fifth harmonic content and the seventh harmonic content are greatly reduced.
It can be seen from the above embodiments that the zero-crossing distortion of the input current of the three-phase star-connected controllable rectifier with unidirectional energy flow can be effectively eliminated or suppressed by adopting the method provided by the invention.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims (1)

1. A method for suppressing zero-crossing distortion of input current of a unidirectional three-phase star-connected controllable rectifier based on modulated wave compensation is characterized by comprising the following steps:
the method comprises the following steps: for three-phase network voltage ua、ub、ucSampling, adopting a decoupling software phase-locked loop of a double-synchronous coordinate system to carry out phase locking on the power grid to obtain an angle theta of the power grid voltage, and carrying out Clark and Park coordinate transformation on the three-phase power grid voltage to obtain a sampling value u of the voltage under a two-phase rotating coordinate systemd、uq(ii) a For three-phase network current ia、ib、icSampling, and performing Clark and Park coordinate transformation to obtain a sampling value i of the current under a two-phase rotating coordinate systemd、iq(ii) a The DC side voltage command value udc *Average value u of DC side capacitor voltage of three phasesdc_aveMaking a difference, and obtaining the amplitude i of the command current under a d-axis coordinate system by the generated difference through a PI (proportional integral) controllerd *And obtaining the amplitude i of the command current in a q-axis coordinate system according to the required power factor angle theta provided by the three-phase star-connected controllable rectifierq *Wherein iq *＝idTan θ; sampling value i of actual currentd、iqWith a given value id*、iqMaking difference and adopting feedforward control method to make differencedAnd iqDecoupling control is carried out to obtain components u of the three-phase modulation wave voltage on the d axis and the q axiscond *、uconq *And obtaining three-phase modulation wave voltage u through iPark and iClark coordinate transformationcona *、uconb *、uconc *；
Step two: the three-phase modulation wave voltage u in each moment is obtained by calculationcona *、uconb *、uconc *Is added to the minimum value as the compensated modulated wave voltage urevise *And the original three-phase modulated wave voltage u is converted into the three-phase modulated wave voltagecona *、uconb *、uconc *Modulated wave voltage u separately compensatedrevise *Adding to generate new three-phase modulated wave voltage unewa *、unewb *、unewc *；
Step three: the new modulated wave voltage u obtained in the step twonewa *、unewb *、unewc *Divided by the DC-side voltage command value udc *And taking the absolute value, with the amplitude of 1 and the frequency of fsThe triangular carrier wave is intercepted to obtain PWM wave signals to drive the switch tubes on each phase of bridge arms, and the voltage u of the neutral point on the AC side of the rectifier relative to the neutral point of the power supply at the momentNO *Just the low-frequency component of the modulated wave voltage urevise *；
The compensated modulation wave voltage can be obtained in real time, the calculated amount is small, the reliability is high, and as long as the controllers of the voltage loop and the current loop are stable, the zero-crossing distortion of the input current of the unidirectional three-phase star-connected controllable rectifier can be eliminated or inhibited by adjusting the modulation wave voltage in real time, so that the unidirectional three-phase star-connected controllable rectifier can realize lag, lead and unit power factor operation in a certain range, and the requirements of a power grid and electric equipment on harmonic standards are met.
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