CN106411163B - The control method of three-phase three-switch three-level high-power factory rectifier - Google Patents
The control method of three-phase three-switch three-level high-power factory rectifier Download PDFInfo
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- CN106411163B CN106411163B CN201611071741.4A CN201611071741A CN106411163B CN 106411163 B CN106411163 B CN 106411163B CN 201611071741 A CN201611071741 A CN 201611071741A CN 106411163 B CN106411163 B CN 106411163B
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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
- H02M7/219—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 bridge configuration
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
It is to be combined triangle wave control and Cycle Control the invention discloses a kind of control method of three-phase three-switch three-level high-power factory rectifier；Using double-closed-loop control, outer ring is direct current pressure ring, and inner ring is alternating current ring, finally by the output of triangle wave device come the on-off of control switch；It is when electric current is negative value that the modulating wave of output is reversed when triangle wave controls, and introduced in Cycle Control | ia| it is carried out for feedback quantity.Three phase network phase information is detected without three-phase software phase-lock loop, saves and calculates the time, directly obtains one and three-phase power grid voltage same-phase, the three phase network synchronization signal v that amplitude is 1 divided by real-time grid crest voltage using three-phase power grid voltagea1、vb1、vc1。
Description
Technical field:
The invention belongs to field of power electronics, are related to a kind of high-power factory rectifier, and especially a kind of three-phase three switchs
The control method of three multi-level high-power factory rectifiers.
Background technique:
With the development of power electronics technology, the power quality problem of AC power supply system receives more and more attention.
Traditional rectification link be widely used diode uncontrollable rectifier or Thyristor Controlled rectification circuit power grid is filled with it is a large amount of humorous
Involve idle and causes serious pollution.Improve grid side power factor and reduce Harmonics of Input unit power because
Number rectifier becomes research hotspot.
There are mainly three types of the control methods that three-phase three-switch three-level high-power factory rectifier uses at present:
Space vector pulse width modulation: three-phase three-switch three-level rectifier is made of 3 bridge arms, and each bridge arm has 3 to open
Off status, a total of 27 kinds of switch states.But due to the symmetry of three-phase current, the polarity of three-phase current cannot be positive simultaneously or
It is negative, therefore three-phase three-switch three-level rectifier no 111 and two kinds of switch states of -1-1-1, therefore the sum of switch state is
25.Using SVPWM vector controlled, electric current section has 6, and the switch state in each electric current section has 8, therefore space vector
There are 8*6=48, vector state is more, and control is complicated, and it is long to calculate the time.It is difficult for switching frequency to be increased to 10K or more, therefore needs
The occasion of high-frequency PWM rectifier is wanted, vector controlled is relatively more limited.
Hysteresis control: Hysteresis control is the double-closed-loop control of a routine, and outer ring is Voltage loop, and inner ring is electric current loop, outside
Ring pi regulator exports respectively multiplied by the phase signal of three-phase voltage, just obtains the reference signal of three-phase alternating current.The benchmark
After signal is compared with practical ac current signal, error amount is sent to hysteresis comparator, by the output of comparator come control switch
On-off.This control method ensure that input current and the same phase of network voltage, and control DC output voltage.Using stagnant ring control
The PWM rectifier system structure of system is simple, is easy to devices at full hardware realization, and dynamic performance is excellent, current-responsive is fast.But it is lacked
Point is also apparent from: the variation of the switching frequency of its power tube acutely, tracks poor when frequency is low, switching loss is big when frequency is high.
Cycle Control: it is exactly the duty ratio for controlling switching tube in each switch periods, keeps the stable state of switching variable average
Value is equal to or directly proportional to reference quantity.
SVPWM Control Method, vector state is more, and control is complicated, and it is long to calculate the time.It is difficult that frequency will be switched
Rate is increased to 10K or more, it is therefore desirable to which the occasion of high-frequency PWM rectifier, vector controlled are relatively more limited.
Using Hysteresis control, the switching frequency variation of power tube acutely, tracks poor, frequency Gao Shikai when frequency is low
It is big to close loss.
Cycle Control directly controls the duty ratio of the switching tube of a cycle, belongs to Average Current Control, to current tracking
Ability is poor, poor anti jamming capability.
Summary of the invention:
It is an object of the invention to overcome the above-mentioned prior art, the three-phase three for providing a kind of energy single-phase flow is opened
Three multi-level high-power factory rectifiers are closed, compared with being traditionally used for powerful three-phase full-bridge rectifier, there is centainly excellent
Gesture, three level natures make the voltage stress on switching tube there was only the half of output voltage, select under powerful application
Switching tube is easier, and output voltage ripple is small, input filter is small in size, reduces electric current THD.With three-level rectifier phase
Than required switching tube is reduced to 3 by 12, and cost reduces, and control is simple.Therefore, three-phase tri-level High Power Factor rectifies
Device may replace existing diode rectification or thyristor rectifier, be widely used in industrial system, improve power quality.
The purpose of the present invention is by the following technical programs to solve:
The control method of three-phase three-switch three-level high-power factory rectifier is by triangle wave control and single-revolution control
System is combined；Using double-closed-loop control, outer ring is direct current pressure ring, and inner ring is alternating current ring, finally by triangle wave
The output of device carrys out the on-off of control switch；It is when electric current is negative value that the modulating wave of output is reversed when triangle wave controls, and
Introduced in Cycle Control | ia| it is carried out for feedback quantity.
The data volume of acquisition is three-phase alternating voltage va、vb、vc, three-phase alternating current ia、ib、ic, DC voltage Vdc1、
Vdc2；Using three-phase power grid voltage divided by real-time grid crest voltage, one and three-phase power grid voltage same-phase, amplitude 1 are obtained
Three phase network synchronization signal va1、vb1、vc1；Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Addition obtains DC voltage Vdc。
It further include a grading ring；
The composition of direct current pressure ring: DC voltage gives VdcrefWith DC voltage VdcDifference be sent into Voltage loop PI adjust
Device obtains the output V of Voltage loop pi regulatordcpiout；The purpose of direct current pressure ring is stable DC end voltage；
The composition of alternating current ring: the output V of Voltage loop pi regulatordcpioutRespectively multiplied by three phase network synchronization signal
va1、vb1、vc1After obtain signal iaref、ibref、icref, signal iaref、ibref、icrefSignal i after taking absolute valuearef1、ibref1、
icref1The input of electric current loop is given；Three-phase alternating current ia、ib、icIt takes absolute value to obtain electric current loop input signal ia1、ib1、ic1；
Given value of current iaref1、ibref1、icref1With electric current loop input signal ia1、ib1、ic1Difference be sent into electric current loop pi regulator, obtain
The output i of electric current loop pi regulatorpiouta、ipioutb、ipioutc；The effect of electric current loop is to be exported according to the load condition of DC terminal
Watt current；
Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Difference be sent into grading ring pi regulator, constitute Pressure and Control
Ring；The effect of Pressure and Control ring is to balance upper and lower capacitance voltage, keeps upper and lower capacitance voltage equal；
Three phase network synchronization signal va1、vb1、vc1Signal v is obtained after subtracting Pressure and Control ringa2、vb2、vc2, 1 subtracts va2、
vb2、vc2Absolute value after obtain that three-phase front feedback value A phase feedovers, B phase feedovers, C phase feedovers multiplied by proportionality coefficient k；
The output i of electric current loop pi regulatorpiouta、ipioutb、ipioutc；In addition three-phase front feedback value A phase feedovers, B phase feedovers, C
After mutually feedovering, it is sent into triangle wave unit, generates 3 road PWM driving switch pipes.
The beneficial effects of the present invention are: it is to be combined triangle wave control and Cycle Control.Control is still drawn
Enter double-closed-loop control, outer ring is Voltage loop, and inner ring is electric current loop, finally by the output of triangle wave device come the logical of control switch
It is disconnected.It is also related with current direction since UAN is not only related with switch state when Hysteresis control, it is therefore desirable to electric current be negative value
When the modulating wave of output is reversed, and the duty ratio of rectifier and the absolute value of input current are related in Cycle Control, therefore,
Introduced in control | ia| carried out for feedback quantity, thus do not need as in Hysteresis control when electric current is negative value by the modulating wave of output
Reversely.
Detailed description of the invention:
Fig. 1 is three-phase three-switch three-level high-power factory rectifier structural schematic diagram of the invention；
Fig. 2 is three-phase three-switch three-level high-power factory rectifier control block diagram of the invention.
Specific embodiment:
The invention will be described in further detail with reference to the accompanying drawing:
It is to be combined triangle wave control and Cycle Control referring to Fig. 1,2；Using double-closed-loop control, outer ring is
Direct current pressure ring, inner ring are alternating current ring, finally by the output of triangle wave device come the on-off of control switch；Triangular wave ratio
It is when electric current is negative value that the modulating wave of output is reversed when compared with control, and introduced in Cycle Control | ia| it is carried out for feedback quantity.
When three-phase mains voltage is symmetrical, have:
It is assumed that VIENNA work is in ccm mode, da、db、dcRespectively switching tube Sa、Sb、ScThe duty ratio of driving signal,
Have:
Relationship between rectifier input and output voltage and switching tube driving duty ratio.
In order to realize unity power factor, it should accomplish that each phase input current follows each phase input voltage, i.e., each phase respectively
Input impedance be purely resistive, define ReEquivalent resistance is inputted for each phase.Therefore the control target of VIENNA rectifier is to make
Three-phase input voltage, input current meet:
Finally obtain the relationship between rectifier input and output voltage and switching tube driving duty ratio.
Therefore, the duty ratio of rectifier and the absolute value of input current are related, therefore, introduce in control | ia| for feedback
Amount carries out.
When three-phase mains voltage is symmetrical, have:
It is assumed that VIENNA work is in ccm mode, da、db、dcRespectively switching tube Sa、Sb、ScThe duty ratio of driving signal,
Have:
Relationship between rectifier input and output voltage and switching tube driving duty ratio.
In order to realize unity power factor, it should accomplish that each phase input current follows each phase input voltage, i.e., each phase respectively
Input impedance be purely resistive, define ReEquivalent resistance is inputted for each phase.Therefore the control target of VIENNA rectifier is to make
Three-phase input voltage, input current meet:
Finally obtain the relationship between rectifier input and output voltage and switching tube driving duty ratio.
Therefore, the duty ratio of rectifier and the absolute value of input current are related, therefore, introduce in control | ia| for feedback
Amount.
The data volume for needing to acquire is three-phase alternating voltage va、vb、vc, three-phase alternating current ia、ib、ic, DC voltage
Vdc1、Vdc2。
Control method as described herein detects three phase network phase information without three-phase software phase-lock loop, when saving calculating
Between, directly one and three-phase power grid voltage same-phase, amplitude are obtained divided by real-time grid crest voltage using three-phase power grid voltage
For 1 three phase network synchronization signal va1、vb1、vc1。
Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Addition obtains DC voltage Vdc。
Control section includes three loops in total: direct current pressure ring, alternating current ring, grading ring.
The composition of direct current pressure ring: DC voltage gives VdcrefWith DC voltage VdcDifference be sent into Voltage loop PI adjust
Device obtains the output V of Voltage loop pi regulatordcpiout.The purpose of direct current pressure ring is stable DC end voltage.
The composition of alternating current ring: the output V of Voltage loop pi regulatordcpioutRespectively multiplied by three phase network synchronization signal
va1、vb1、vc1After obtain signal iaref、ibref、icref, signal iaref、ibref、icrefSignal i after taking absolute valuearef1、ibref1、
icref1The input of electric current loop is given.Three-phase alternating current ia、ib、icIt takes absolute value to obtain electric current loop input signal ia1、ib1、ic1。
Given value of current iaref1、ibref1、icref1With electric current loop input signal ia1、ib1、ic1Difference be sent into electric current loop pi regulator, obtain
The output i of electric current loop pi regulatorpiouta、ipioutb、ipioutc.The effect of electric current loop is to be exported according to the load condition of DC terminal
Watt current.
Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Difference be sent into grading ring pi regulator, constitute Pressure and Control
Ring.The effect of Pressure and Control ring is to balance upper and lower capacitance voltage, keeps upper and lower capacitance voltage equal.
Three phase network synchronization signal va1、vb1、vc1Signal v is obtained after subtracting Pressure and Control ringa2、vb2、vc2, 1 subtracts va2、
vb2、vc2Absolute value after obtain that three-phase front feedback value A phase feedovers, B phase feedovers, C phase feedovers multiplied by proportionality coefficient k.
The output i of electric current loop pi regulatorpiouta、ipioutb、ipioutc.In addition three-phase front feedback value A phase feedovers, B phase feedovers, C
After mutually feedovering, it is sent into triangle wave unit, generates 3 road PWM driving switch pipes.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (1)
1. the control method of three-phase three-switch three-level high-power factory rectifier, it is characterised in that: be by triangle wave control
System and Cycle Control are combined；Using double-closed-loop control, outer ring is direct current pressure ring, and inner ring is alternating current ring, finally by
The output of triangle wave device carrys out the on-off of control switch；When triangle wave controls, not needing will be defeated when electric current is negative value
Modulating wave out is reversed, and introduces in Cycle Control | ia| it is carried out for feedback quantity；
The data volume of acquisition is three-phase alternating voltage va、vb、vc, three-phase alternating current ia、ib、ic, DC voltage Vdc1、Vdc2；Make
With three-phase power grid voltage divided by real-time grid crest voltage, one and three-phase power grid voltage same-phase, the three-phase that amplitude is 1 are obtained
Synchronized signal va1、vb1、vc1；Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Addition obtains DC voltage Vdc；
It further include a grading ring；
The composition of direct current pressure ring: DC voltage gives VdcrefWith DC voltage VdcDifference be sent into Voltage loop pi regulator, obtain
To the output V of Voltage loop pi regulatordcpiout；The purpose of direct current pressure ring is stable DC end voltage；
The composition of alternating current ring: the output V of Voltage loop pi regulatordcpioutRespectively multiplied by three phase network synchronization signal va1、vb1、
vc1After obtain signal iaref、ibref、icref, signal iaref、ibref、icrefSignal i after taking absolute valuearef1、ibref1、icref1For
The input of electric current loop is given；Three-phase alternating current ia、ib、icIt takes absolute value to obtain electric current loop input signal ia1、ib1、ic1；Electric current
Given iaref1、ibref1、icref1With electric current loop input signal ia1、ib1、ic1Difference be sent into electric current loop pi regulator, obtain electric current
The output i of ring pi regulatorpiouta、ipioutb、ipioutc；The effect of electric current loop is active according to the output of the load condition of DC terminal
Electric current；
Upper capacitance voltage Vdc1With lower capacitance voltage Vdc2Difference be sent into grading ring pi regulator, constitute Pressure and Control ring；?
Press control ring effect be balance up and down capacitance voltage, make up and down capacitance voltage it is equal；
Three phase network synchronization signal va1、vb1、vc1Signal v is obtained after subtracting Pressure and Control ringa2、vb2、vc2, 1 subtracts va2、vb2、vc2
Absolute value after obtain that three-phase front feedback value A phase feedovers, B phase feedovers, C phase feedovers multiplied by proportionality coefficient k；
The output i of electric current loop pi regulatorpiouta、ipioutb、ipioutcIn addition three-phase front feedback value A phase feedovers, B phase feedovers, the phase front C
After feedback, it is sent into triangle wave unit, generates 3 road PWM driving switch pipes.
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| CN109713929B (en) * | 2019-01-07 | 2021-01-22 | 深圳市瀚仑达实业有限公司 | Three-phase three-switch two-level rectifier based on zero-voltage soft switch |
| CN115954924A (en) * | 2023-03-15 | 2023-04-11 | 广东电网有限责任公司佛山供电局 | Multi-port flexible loop closing switch and control method thereof |
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