CN109980962A - The unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase - Google Patents
The unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase Download PDFInfo
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- CN109980962A CN109980962A CN201910257520.3A CN201910257520A CN109980962A CN 109980962 A CN109980962 A CN 109980962A CN 201910257520 A CN201910257520 A CN 201910257520A CN 109980962 A CN109980962 A CN 109980962A
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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
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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Abstract
The present invention provides a kind of unidirectional Cascaded multi-level converter dc-voltage balance modulation strategies of three-phase, mainly include sorting module, combo module, computing module and modulating wave generation module.The present invention improves traditional SPWM (SVPWM) modulation strategy, compared with the dc-voltage balance modulation strategy of conventional PI control, have the advantages that adjustment speed is fast, adjustable range is big, entire circuit can be made to run under High Power Factor simultaneously, when the degree of unbalancedness of the unidirectional Cascaded multi-level converter DC voltage of three-phase is larger, method provided by the invention, which can make the unidirectional Cascaded multi-level converter of three-phase adjust DC voltages at different levels with maximum rate, makes it keep balance, and can guarantee good current on line side quality.
Description
Technical field
The present invention relates to Cascaded multi-level converter dc-voltage balances to modulate field, in particular to three-phase unidirectionally cascades
Formula Multilevel Inverters.
Background technique
No industrial frequency transformer cascaded H-bridges current transformer input side power factor with higher, modularized design, four-quadrant fortune
Row, many advantages, such as voltage stress is lower, the more and more attention by academia and industry.However a large amount of full-control type
The use of switching device bring system complex, involve great expense, efficiency reduce, failure rate improve the defects of.
In view of being not required for realizing the transmitted in both directions of energy in a large amount of industrial production, full-controlled switch device is used completely
The no industrial frequency transformer cascaded H-bridges current transformer of part is in without the blower of energy feedback, pumping motor frequency conversion speed-adjusting system
Using having no necessity.Therefore, unidirectional Cascaded multi-level converter comes into being.
For the DC side of unidirectional Cascaded multi-level converter, the equilibrium of each current transformer DC side output voltage is
Guarantee system stabilization, the prerequisite of reliably working.However, in practical projects, due to the inevitable difference of device parameters
And the load being likely to occur is asymmetric, the power loss of each current transformer is not identical, so if without effectively controlling,
DC output voltage imbalance problem can be generated, to trigger the overvoltage protection of certain module, switching tube is even caused when serious
Damage or even system crash.
Traditional SPWM (SVPWM) modulation uses PI controller usually in the unidirectional Cascaded multi-level converter of three-phase, so
And there are integral elements for PI controller, so that this method voltage adjustment speed is slow and adjustable range is limited.
Therefore, research is improved to SPWM (SVPWM) modulation, the unidirectional cascade multi-level of three-phase can be applied to
The Fast-Balance of current transformer DC voltage controls, and is of great significance.
Summary of the invention
The purpose of the present invention is traditional SPWM (SVPWM) modulation on the basis of, to traditional SPWM (SVPWM) modulation strategy
It improves, compared with the voltage balance control strategy of conventional PI control, with that adjustment speed is fast, adjustable range is big is excellent
Point, when the unidirectional Cascaded multi-level converter DC voltage degree of unbalancedness of three-phase is larger, method provided by the invention can make three
Mutually unidirectional Cascaded multi-level converter, which adjusts DC voltages at different levels with maximum rate, makes it keep balance, and can guarantee good
Current on line side quality.
In order to achieve the above objectives, the present invention provides the unidirectional Cascaded multi-level converter dc-voltage balance modulation of three-phase
Strategy, the wherein unidirectional Cascaded multi-level converter of three-phase, including the order of three-phase star are to Cascaded multi-level converter, three-phase star
Order is made of to Cascaded multi-level converter 3*N energy one way flow current transformer cascade, wherein every phase is by N number of energy
One way flow current transformer cascade composition, N are the integer greater than 1；The order of three-phase star includes three to Cascaded multi-level converter
Phase star connects tandem type diode H-bridge current transformer, three-phase star connects tandem type and connects tandem type VIENNA unsteady flow without bridge current transformer, three-phase star
Device；
Steps are as follows for the unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase of the present invention:
(1) electric to the AC input voltage of Cascaded multi-level converter, the input of exchange side to the order of three-phase star respectively
Stream is sampled, and three-phase alternating current input voltage U is obtainedsa、Usb、Usc, three-phase alternating current input current Isa、Isb、Isc；
(2) order of three-phase star is sampled to the DC voltage of Cascaded multi-level converter, obtains 3*N direct current
Voltage signal Udca1、Udca2...UdcaN、Udcb1、Udcb2...UdcbN、Udcc1、Udcc2...UdccN, wherein every phase obtains N number of direct current
Press signal；
(3) the N number of d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2...UdckN(k=a, b, c)
It is separately summed, obtains every phase and always export d. c. voltage signal Udca、Udcb、UdccFor
Wherein UdcknIt is the order of three-phase star to n-th of energy one way flow current transformer of Cascaded multi-level converter k phase
D. c. voltage signal, n are the positive integer less than or equal to N；
(4) according to the order of three-phase star, to Cascaded multi-level converter, in dq rotating coordinate system, (or alpha-beta is static
Coordinate system) under mathematical model, will sampling obtains in step (1) three-phase alternating current input voltage Usa、Usb、Usc, three-phase alternating current is defeated
Enter electric current Isa、Isb、Isc, the every phase being calculated in step (3) always exports d. c. voltage signal Udca、Udcb、UdccBring three-phase into
Star order to Cascaded multi-level converter mathematical model, applied voltage current double closed-loop control mode realize the order of three-phase star to
The control of Cascaded multi-level converter obtains initial three-phase mark modulated signal using SPWM (or SVPWM) modulation system |
Va|、|Vb|、|Vc|；
(5) side neutral point is exchanged relative to mains neutral point to Cascaded multi-level converter by control three-phase star order
Voltage realize to the order of three-phase star to Cascaded multi-level converter current over-zero distort inhibit, using based on residual voltage infuse
The mode entered completes voltage between phases Balance route, so that three-phase in step (4) is initially marked modulated signal | Va|、|Vb|、|Vc|
It is optimized for three-phase mark modulated signal | Va′|、|Vb′|、|Vc′|；
(6) the N number of d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2...UdckN(k=a, b, c)
It is respectively fed to the sorting module of each phase, is arranged by the sequence of voltage from big to small or from small to large；
(7) by the DC voltage U after mutually sequence each in step (6)dck1、Udck2...UdckN(k=a, b, c) carries out combo,
Method for group matching is as follows:
(a) the corresponding energy one direction of peak in N number of d. c. voltage signal when N is even number, after each mutually sequence
Flowing current transformer energy one way flow current transformer corresponding with minimum is one group of d. c. voltage signal, remaining DC voltage
The corresponding energy one way flow current transformer of peak energy one way flow current transformer corresponding with minimum in signal is
One group of d. c. voltage signal, final three-phase star order is to Cascaded multi-level converter with this rule with for 3*N/2 group direct current
Press signal, every to match be N/2 group d. c. voltage signal, at this time three-phase combo mould to the order of three-phase star to Cascaded multi-level converter
Block exports 3*N/2 group d. c. voltage signal information altogether, wherein every phase combo module exports N/2 group d. c. voltage signal information, often
Group d. c. voltage signal is made of a high voltage signal and a low voltage signal；
(b) the corresponding energy one direction of peak in N number of d. c. voltage signal when N is odd number, after each mutually sequence
Flowing current transformer energy one way flow current transformer corresponding with minimum is one group of d. c. voltage signal, remaining DC voltage
The corresponding energy one way flow current transformer of peak energy one way flow current transformer corresponding with minimum in signal is
One group of d. c. voltage signal, except every phase d. c. voltage signal sequence in addition to most intermediate energy one way flow current transformer, finally
The order of three-phase star is matched to Cascaded multi-level converter with this rule for 3* (N-1)/2 group d. c. voltage signal, wherein three-phase star
Order is (N-1)/2 group d. c. voltage signal to the every matching of Cascaded multi-level converter, and three-phase combo module exports altogether at this time
3* (N-1)/2 groups of d. c. voltage signal information, wherein every phase combo module exports (N-1)/2 group d. c. voltage signal information, often
Group d. c. voltage signal is made of a high voltage signal and a low voltage signal；
(8) the three-phase mark modulated signal of the optimization in step (5) | Va′|、|Vb′|、|Vc' | it is sent into computing module, is calculated
Obtain modulating wave adjustment signal Δ | V 'k| (k=a, b, c)
(9) by the method for group matching in step (7), the middle three-phase mark modulated signal optimized of step (5) | Va′|、|Vb′|、|
Vc' | and modulating wave adjustment signal Δ in step (8) | V 'k| (k=a, b, c) is sent into modulating wave generation module, three-phase modulations wave
Signal re-optimization exports the road 3*N modulation wave signal | Va1″|、|Va2″|...|VaN″|、|Vb1″|、|Vb2″|...|VbN″|、|Vc1″
|、|Vc2″|...|VcN" |, wherein every phase exports the road N modulation wave signal | Vk1″|、|Vk2″|...|VkN" | (k=a, b, c):
(a) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, high voltage signal is corresponding
Energy one way flow current transformer modulation wave signal is | Vk" |=| Vk′|-|ΔVk' | (k=a, b, c)；
(b) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, low voltage signal is corresponding
Energy one way flow current transformer modulation wave signal is | Vk" |=| Vk′|+|ΔVk' | (k=a, b, c)；
(c) it when N is odd number, sorts in the most intermediate corresponding energy one way flow current transformer tune of d. c. voltage signal
Wave signal processed is | Vk" |=| Vk' | (k=a, b, c)；
(10) N number of carrier wave is successively postponed into 1/N*Ts(TsFor switch periods), respectively with the N of every phase re-optimization in step (9)
Road modulation wave signal | Vk1″|、|Vk2″|...|VkN" | (k=a, b, c) carries out signal by comparator and completes a business transaction, the raw road 3*N of common property
Pwm signal wherein every phase generates the road N pwm signal, and then controls the order of three-phase star to Cascaded multi-level converter switching device
On-off.
Present invention has an advantage that
(1) realtime control is good.Compared with traditional SPWM (SVPWM) modulation, the present invention is in the order of three-phase star to tandem type
Not using traditional pi regulator when Multilevel Inverters dc-voltage balance at different levels, instantaneously can at full throttle be adjusted
Section, thus it is extremely short to control delay.
(2) adjustable range is big.Traditional pi regulator is Linear Control, and adjustable range is limited.The present invention is using non-linear
Control, also can be to three-phase star when the order of three-phase star is larger to Cascaded multi-level converter DC load imbalance degree at different levels
Order is effectively adjusted to Cascaded multi-level converter DC voltages at different levels.
It is described in detail below in conjunction with embodiment referring to attached drawing.
Detailed description of the invention
Fig. 1 is block diagram of the invention；
Fig. 2 is that the three-phase star of three-stage cascade in the embodiment of the present invention connects circuit diagram of the tandem type without bridge current transformer；
Fig. 3 is the circuit diagram that three-phase star connects tandem type diode H-bridge current transformer；
Fig. 4 is that three-phase star connects circuit diagram of the tandem type without bridge current transformer；
Fig. 5 is the circuit diagram that three-phase star connects VIENNA current transformer；
Fig. 6 is that the three-phase star of three-stage cascade in the embodiment of the present invention connects tandem type without bridge current transformer in DC load imbalance
The analogous diagram of Shi Caiyong present invention front and back DC voltage.
Specific embodiment
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawing, adequately to understand mesh of the invention
, feature and effect.This gives detailed embodiment and specific operating process, but protection scope of the present invention
It is not limited to the present embodiment.
Embodiment:
Referring to Fig. 2, tandem type is connect without the bridge current transformer application present invention to the three-phase star of three-stage cascade.The three-stage cascade
It is the one kind of three-phase star order to Cascaded multi-level converter that three-phase star, which connects tandem type without bridge current transformer, and every phase is by 3 without bridge
Current transformer cascades.
Steps are as follows for the unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase of the present invention:
(1) to connect AC input voltage of the tandem type without bridge current transformer, exchange side to the three-phase star of three-stage cascade respectively defeated
Enter electric current to be sampled, obtains three-phase alternating current input voltage Usa、Usb、Usc, three-phase alternating current input current Isa、Isb、Isc；
(2) tandem type is connect to the three-phase star of three-stage cascade to sample without the DC voltage of bridge current transformer, obtain 9 directly
Flow voltage signal, Udca1、Udca2、Udca3、Udcb1、Udcb2、Udcb3、Udcc1、Udcc2、Udcc3, wherein every phase obtains 3 DC voltages
Signal；
(3) 3 d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2、Udck3(k=a, b, c) point
It is not added, obtains every phase and always export d. c. voltage signal Udca、Udcb、UdccFor
Wherein UdcknTandem type is connect without n-th of bridge current transformer k phase without bridge current transformer direct current for the three-phase star of three-stage cascade
Signal is pressed, n is the positive integer less than or equal to 3；
(4) tandem type is connect without bridge current transformer in dq rotating coordinate system (or alpha-beta according to the three-phase star of three-stage cascade
Rest frame) under mathematical model, will sampling obtains in step (1) three-phase alternating current input voltage Usa、Usb、Usc, three intersections
Flow input current Isa、Isb、Isc, the every phase being calculated in step (3) always exports d. c. voltage signal Udca、Udcb、UdccIt brings into
The three-phase star of three-stage cascade connects tandem type without bridge current transformer mathematical model, and applied voltage current double closed-loop control mode realizes three-level
Cascade three-phase star connects control of the tandem type without bridge current transformer, using SPWM (or SVPWM) modulation system, obtains initial three-phase mark
Modulated signal | Va|、|Vb|、|Vc|；
(5) tandem type is connect without bridge AC side of converter neutral point relative in power supply by controlling the three-phase star of three-stage cascade
Property point voltage realize to the three-phase star of three-stage cascade connect tandem type without bridge current transformer current over-zero distort inhibit, using be based on zero
The mode of sequence voltage injection completes voltage between phases Balance route, so that three-phase in step (4) is initially marked modulated signal | Va|、
|Vb|、|Vc| it is optimized for three-phase mark modulated signal | Va′|、|Vb′|、|Vc′|；
(6) 3 d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2、Udck3(k=a, b, c) point
It is not sent into the sorting module of each phase, is arranged by the sequence of voltage from big to small or from small to large；
(7) by the DC voltage U after mutually sequence each in step (6)dck1、Udck2、Udck3(k=a, b, c) carries out combo, matches
Group method is as follows:
In the present embodiment, N=3 is odd number, the corresponding no bridge of peak in 3 d. c. voltage signals after each mutually sequence
Current transformer no bridge current transformer corresponding with minimum is one group of d. c. voltage signal, and remaining 1 d. c. voltage signal is that sequence exists
Most intermediate no bridge current transformer, thus except sequence in addition to the most intermediate corresponding no bridge current transformer of d. c. voltage signal, final three-level
It is 3 groups of d. c. voltage signals that cascade three-phase star, which connects tandem type to match without bridge current transformer, and wherein the three-phase star of three-stage cascade connects cascade
Formula is 1 group of d. c. voltage signal without the every matching of bridge current transformer.Every group of d. c. voltage signal is low by a high voltage signal and one
Voltage signal composition.
(8) the three-phase mark modulated signal of the optimization in step (5) | Va′|、|Vb′|、|Vc' | it is sent into computing module, is calculated
Obtain modulating wave adjustment signal Δ | V 'k| (k=a, b, c)
(9) by the method for group matching in step (7), the middle three-phase mark modulated signal optimized of step (5) | Va′|、|Vb′|、|
Vc' | and modulating wave adjustment signal Δ in step (8) | V 'k| (k=a, b, c) is sent into modulating wave generation module, three-phase modulations wave
Signal re-optimization exports 9 road modulation wave signals | Va1″|、|Va2″|、|Va3″|、|Vb1″|、|Vb2″|、|Vb3″|、|Vc1″|、|Vc2″
|、|Vc3" |, wherein every phase exports 3 road modulation wave signals | Vk1″|、|Vk2″|、|Vk3" | (k=a, b, c):
(a) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, high voltage signal is corresponding
No bridge current transformer modulation wave signal is | Vk" |=| Vk′|-|ΔVk' | (k=a, b, c)；
(b) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, low voltage signal is corresponding
No bridge current transformer modulation wave signal is | Vk" |=| Vk′|+|ΔVk' | (k=a, b, c)；
(c) every mutually remaining sequence is in the modulation wave signal of the most intermediate corresponding no bridge current transformer of d. c. voltage signal
|Vk" |=| Vk' | (k=a, b, c)；
(10) 3 carrier waves are successively postponed into 1/3*Ts(TsFor switch periods), respectively with 3 of every phase re-optimization in step (9)
Road modulation wave signal | Vk1″|、|Vk2″|、|Vk3" | (k=a, b, c) carries out signal by comparator and completes a business transaction, the raw 9 road PWM letter of common property
Number, wherein every phase generates 3 road pwm signals, and then the three-phase star for controlling three-stage cascade connects tandem type without bridge current transformer switching device
On-off.
Referring to Fig. 6, the three-phase star for three-stage cascade in the embodiment of the present invention connects tandem type without bridge current transformer in DC load
Using the analogous diagram of DC voltage before and after the present invention when uneven.The system dc load balance before 0.3s, system operation enter
Stable state, the system dc balance of voltage；In 0.3s, system dc load sudden change, at this time not with the application of the invention, system is in imbalance
Under the influence of DC load, DC voltage can not continue to keep balance, generate energy imbalance；In 0.6s with the application of the invention,
It is adjusted rapidly it can be seen that the three-phase star of three-stage cascade connects DC voltage of the tandem type without bridge current transformer, reaches balance, it was demonstrated that
Effectiveness of the invention.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to structure of the invention
Think and range is defined, under the premise of not departing from design scheme of the present invention, engineers and technicians are to of the invention in this field
The all variations and modifications that technical solution is made, should all fall into protection scope of the present invention, in the claimed technology of the present invention
Hold, is all described in the claims.
Claims (1)
1. the unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase, the unidirectional cascade multi-level of three-phase
Current transformer, including the order of three-phase star is to Cascaded multi-level converter, the three-phase star order is to Cascaded multi-level converter
It is made of 3*N energy one way flow current transformer cascade, wherein every phase is by N number of energy one way flow current transformer cascaded series
At N is the integer greater than 1；The three-phase star order includes that three-phase star meets tandem type diode H to Cascaded multi-level converter
Bridge current transformer, three-phase star connect tandem type and connect tandem type VIENNA current transformer without bridge current transformer, three-phase star；
It is characterized in that, steps are as follows for the unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase:
(1) respectively to AC input voltage from the order of three-phase star to Cascaded multi-level converter, exchange side input current into
Row sampling, obtains three-phase alternating current input voltage Usa、Usb、Usc, three-phase alternating current input current Isa、Isb、Isc；
(2) order of three-phase star is sampled to the DC voltage of Cascaded multi-level converter, obtains 3*N DC voltage
Signal Udca1、Udca2...UdcaN、Udcb1、Udcb2...UdcbN、Udcc1、Udcc2...UdccN, wherein every phase obtains N number of DC voltage letter
Number；
(3) the N number of d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2...UdckN(k=a, b, c) difference
It is added, obtains every phase and always export d. c. voltage signal Udca、Udcb、UdccFor
Wherein UdcknIt is the order of three-phase star to n-th of energy one way flow current transformer direct current of Cascaded multi-level converter k phase
Signal is pressed, n is the positive integer less than or equal to N；
(4) according to the order of three-phase star to Cascaded multi-level converter in dq rotating coordinate system (or alpha-beta static coordinate
System) under mathematical model, will sampling obtains in step (1) three-phase alternating current input voltage Usa、Usb、Usc, three-phase alternating current input electricity
Flow Isa、Isb、Isc, the every phase being calculated in step (3) always exports d. c. voltage signal Udca、Udcb、UdccThree-phase star is brought into connect
Unidirectional Cascaded multi-level converter mathematical model, applied voltage current double closed-loop control mode realize the order of three-phase star to cascade
The control of formula Multilevel Inverters obtains initial three-phase mark modulated signal using SPWM (or SVPWM) modulation system | Va|、|
Vb|、|Vc|；
(5) electricity of the side neutral point relative to mains neutral point is exchanged to Cascaded multi-level converter by control three-phase star order
Pressure, which is realized to distort to the order of three-phase star to Cascaded multi-level converter current over-zero, to be inhibited, using based on injected zero-sequence voltage
Mode completes voltage between phases Balance route, so that three-phase in step (4) is initially marked modulated signal | Va|、|Vb|、|Vc| optimization
For three-phase mark modulated signal | Va′|、|Vb′|、|Vc′|；
(6) the N number of d. c. voltage signal U for sampling every phase in step (2)dck1、Udck2...UdckN(k=a, b, c) difference
It is sent into the sorting module of each phase, is arranged by the sequence of voltage from big to small or from small to large；
(7) by the DC voltage U after mutually sequence each in step (6)dck1、Udck2...UdckN(k=a, b, c) carries out combo, combo
Method is as follows:
(a) the corresponding energy one way flow of peak in N number of d. c. voltage signal when N is even number, after each mutually sequence
Current transformer energy one way flow current transformer corresponding with minimum is one group of d. c. voltage signal, remaining d. c. voltage signal
In the corresponding energy one way flow current transformer of peak energy one way flow current transformer corresponding with minimum be one group
D. c. voltage signal, final three-phase star order is to Cascaded multi-level converter with this rule with for 3*N/2 group DC voltage letter
Number, the order of three-phase star is N/2 group d. c. voltage signal to the every matching of Cascaded multi-level converter, and three-phase combo module is total at this time
3*N/2 group d. c. voltage signal information is exported, wherein every phase combo module exports N/2 group d. c. voltage signal information, every group straight
Stream voltage signal is made of a high voltage signal and a low voltage signal；
(b) the corresponding energy one way flow of peak in N number of d. c. voltage signal when N is odd number, after each mutually sequence
Current transformer energy one way flow current transformer corresponding with minimum is one group of d. c. voltage signal, remaining d. c. voltage signal
In the corresponding energy one way flow current transformer of peak energy one way flow current transformer corresponding with minimum be one group
D. c. voltage signal, except every phase d. c. voltage signal sequence in addition to most intermediate energy one way flow current transformer, final three-phase
Star order is to Cascaded multi-level converter with this rule with for 3* (N-1)/2 group d. c. voltage signal, wherein three-phase star order
It is (N-1)/2 group d. c. voltage signal to the every matching of Cascaded multi-level converter, three-phase combo module exports 3* (N- altogether at this time
1)/2 group d. c. voltage signal information, wherein every phase combo module exports (N-1)/2 group d. c. voltage signal information, every group of direct current
Voltage signal is made of a high voltage signal and a low voltage signal；
(8) the three-phase mark modulated signal that will optimize in step (5) | Va′|、|Vb′|、|Vc' | it is sent into computing module, is calculated
Modulating wave adjustment signal Δ | Vk' | (k=a, b, c)
(9) by the method for group matching in step (7), the middle three-phase mark modulated signal optimized of step (5) | Va′|、|Vb′|、|Vc′|
And modulating wave adjustment signal Δ in step (8) | Vk' | (k=a, b, c) is sent into modulating wave generation module, three-phase modulations wave signal
Re-optimization exports the road 3*N modulation wave signal | Va1″|、|Va2″|...|VaN″|、|Vb1″|、|Vb2″|...|VbN″|、|Vc1″|、|
Vc2″|...|VcN" |, wherein every phase exports the road N modulation wave signal | Vk1″|、|Vk2″|...|VkN" | (k=a, b, c):
(a) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, the corresponding energy of high voltage signal
One way flow current transformer modulation wave signal is | Vk" |=| Vk′|-|ΔVk' | (k=a, b, c)；
(b) it according to the method for group matching in step (7), enables in every mutually every group d. c. voltage signal, the corresponding energy of low voltage signal
One way flow current transformer modulation wave signal is | Vk" |=| Vk′|+|ΔVk' | (k=a, b, c)；
(c) it when N is odd number, sorts in the most intermediate corresponding energy one way flow current transformer modulating wave of d. c. voltage signal
Signal is | Vk" |=| Vk' | (k=a, b, c)；
(10) N number of carrier wave is successively postponed into 1/N*Ts(TsFor switch periods), respectively with the road the N tune of every phase re-optimization in step (9)
Wave signal processed | Vk1″|、|Vk2″|...|VkN" | (k=a, b, c) carries out signal by comparator and completes a business transaction, the raw road the 3*N PWM letter of common property
Number, wherein every phase generates the road N pwm signal, and then the order of three-phase star is controlled to the logical of Cascaded multi-level converter switching device
It is disconnected.
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| CN103280987A (en) * | 2013-05-29 | 2013-09-04 | 浙江大学 | Voltage-equalizing and power-equalizing control method for three-phase multi-module cascade solid-state transformer |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN109039129A (en) * | 2018-09-04 | 2018-12-18 | 中国矿业大学(北京) | Unidirectional cascade multi-level electronic power convertor voltage balance control strategy |
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| WO2007112378A2 (en) * | 2006-03-27 | 2007-10-04 | North Carolina State University | Method and circuit for cascaded pulse width modulation |
| CN103280987A (en) * | 2013-05-29 | 2013-09-04 | 浙江大学 | Voltage-equalizing and power-equalizing control method for three-phase multi-module cascade solid-state transformer |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN109039129A (en) * | 2018-09-04 | 2018-12-18 | 中国矿业大学(北京) | Unidirectional cascade multi-level electronic power convertor voltage balance control strategy |
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