CN109256971A - A kind of modular multilevel submodule pressure equalizing control method - Google Patents
A kind of modular multilevel submodule pressure equalizing control method Download PDFInfo
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- CN109256971A CN109256971A CN201811193185.7A CN201811193185A CN109256971A CN 109256971 A CN109256971 A CN 109256971A CN 201811193185 A CN201811193185 A CN 201811193185A CN 109256971 A CN109256971 A CN 109256971A
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- bridge arm
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000010363 phase shift Effects 0.000 claims abstract description 47
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 230000000295 complement effect Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 2
- 230000018199 S phase Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- 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
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to power electronics fields, it is desirable to provide a kind of modular multilevel submodule pressure equalizing control method.It is so that it is able to achieve voltage balance control target without sampling submodule voltage by the turn-on sequence of the upper and lower bridge arm submodule of rotation；It is specific as follows: to ensure that the angle of flow of the upper and lower device for power switching in upper and lower bridge arm in each submodule is complementary, and will not simultaneously turn on；The driving signal of each submodule device for power switching is generated using N+1 level carrier phase shift sinusoidal pulse width modulation strategy, N represents the number of each bridge arm submodule；The level carrier phase shift sinusoidal pulse width modulation strategy refers to that the triangular carrier of adjacent submodule distinguishes successively phase shift radian in upper and lower bridge arm, and the modulation wave phase of upper and lower bridge arm differs radian.The present invention reduces the communication line of system, and eliminate voltage acquisition module, and then improve system reliability without sampling submodule capacitor voltage.
Description
Technical field
The invention belongs to power electronics fields, are related to a kind of modular multilevel submodule pressure equalizing control method.This
Invention realizes the Balance route of modular multilevel submodule capacitor voltage, is a kind of high simple, Control for Dependability method.
Background technique
Modular multilevel converter (Modular Multilevel Converter, MMC, as shown in Figure 1) has mould
Blocking structure is easy to extend, flexible design, has very wide application prospect in mesohigh field.In order to realize in middle height
Application in pressure field needs more submodule.But since there are circulation for bridge arm, it will lead to each submodule in the process of running
Voltage is unequal, and then leads to system running wastage, harmonic wave etc. and increase.
As one of MMC core technology, various pressure strategies are proposed by many scholars, are perfect.Patent
CN103929081A " a kind of submodule method for equalizing voltage for modularization multi-level converter ", patent CN105375801A " one
Kind of modularization multi-level converter pressure equalizing control method " etc. propositions sampling submodule capacitor voltage and bridge arm current, according to electric current
Direction and capacitance voltage determine the switch state of submodule；Patent CN103888003A be " a kind of modularization multi-level converter
Submodule is layered method for equalizing voltage ", patent CN103280990A " a kind of method for equalizing voltage of modularization multi-level converter " etc. proposes
It is sorted according to submodule voltage swing, and its switch state is determined according to bridge arm current direction.But these schemes are required to
Submodule voltage is sampled, while needing to upload submodule voltage value, traffic and sampling module is increased, directly results in system
Hardware circuit is more complicated, increased costs, and reliability is lower, while needing to be ranked up the voltage after sampling or PI operation increases
The operand of master control is added.And it is pressed in above-mentioned document in order to realize, need to sample bridge arm current and judges electric current side accordingly
To.But in actual circuit, bridge arm current is not theoretical current (can be comprising a large amount of harmonic wave etc.), and sampling can cause one
Fixed error, factors above, which will lead to bridge arm current, to be had many place's zero crossings (current direction can change more i.e. at zero crossing
It is secondary), lead to biggish error etc. occur.
For this purpose, propose a kind of highly reliable, inexpensive Pressure and Control strategy, to the application of Modular multilevel converter with
Popularization has a very important significance.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of modular multilevel
Module pressure equalizing control method.
In order to solve the technical problem, solution of the invention is:
A kind of modular multilevel submodule pressure equalizing control method is provided, is leading by the upper and lower bridge arm submodule of rotation
Clear and coherent sequence makes it be able to achieve voltage balance control target without sampling submodule voltage；It is specific as follows:
Ensure that the angle of flow of the upper and lower device for power switching in upper and lower bridge arm in each submodule is complementary, and will not be simultaneously
Conducting；The driving signal of each submodule device for power switching is generated using N+1 level carrier phase shift sinusoidal pulse width modulation strategy,
N represents the number of each bridge arm submodule；The level carrier phase shift sinusoidal pulse width modulation strategy refers to, phase in upper and lower bridge arm
The triangular carrier difference of adjacent submodule successively 2 π of phase shift/N radian, and the modulating wave phase by pi radian of upper and lower bridge arm.
In the present invention, each submodule power switch is being generated using N+1 level carrier phase shift sinusoidal pulse width modulation strategy
It is corresponding for for generating the triangular carrier of driving signal with regard to each submodule when the driving signal of device:
(1) it carves at the beginning, makes the initial phase angle 0 of the triangular carrier of first submodule, the three of second submodule
Angle carrier wave is relative to the former 2 π of phase shift/N, triangular carrier phase of the triangular carrier of third submodule relative to second submodule
Move 2 π/N；And so on, triangular carrier phase shift 2 πs/N of the triangular carrier of n-th submodule relative to the N-1 submodule；With
The driving sequence of upper driving signal continues 0.02s (50Hz)；
(2) driving signal corresponding to each submodule in the 0.02s moment, the upper and lower bridge arm of rotation, specifically:
Make the initial phase angle 0 of the triangular carrier of second submodule, the triangular carrier of third submodule is relative to preceding
2 π of person's phase shift/N, triangular carrier phase shift 2 πs/N of the triangular carrier of the 4th submodule relative to third submodule；With such
It pushes away, triangular carrier phase shift 2 πs/N of the triangular carrier of n-th submodule relative to the N-1 submodule；First submodule
Triangular carrier phase shift 2 πs/N of the triangular carrier relative to n-th submodule；The driving sequence of the above driving signal continues 0.02s；
(3) the 0.04s moment, driving signal corresponding to each submodule in the upper and lower bridge arm of rotation again, specifically:
Make the initial phase angle 0 of the triangular carrier of third submodule, the triangular carrier of the 4th submodule is relative to preceding
2 π of person's phase shift/N；And so on, the triangular carrier of n-th submodule relative to the N-1 submodule 2 π of triangular carrier phase shift/
N；Triangular carrier phase shift 2 πs/N of the triangular carrier of first submodule relative to n-th submodule, the three of second submodule
Triangular carrier phase shift 2 πs/N of the angle carrier wave relative to first submodule；The driving sequence of the above driving signal continues 0.02s；
(4) referring to the mode of step (1)~(3), corresponding to each submodule in 0.02s rotation once upper and lower bridge arm
Driving signal；It is in the angle relationship at 0.02s × (N-1) moment, each bridge arm submodule triangular carrier: makes in upper and lower bridge arm
The initial phase angle of the triangular carrier of respective n-th submodule is 0, and the triangular carrier of first submodule is relative to n-th submodule
2 π of triangular carrier phase shift/N of block, triangular carrier phase shift 2 of the triangular carrier of second submodule relative to first submodule
π/N, the angle relationship and so between the triangular carrier of remaining each submodule；The driving sequence of the above driving signal continues
0.02s；
(5) rotation of the driving signal of a cycle, driving signal and step (1) this moment are completed in 0.02s × n-hour
In it is identical.
In the present invention, first submodule refers to uppermost submodule in bridge arm, is successively downwards second son
Module, third submodule etc., a bottom submodule are n-th submodule.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is opened using the upper and lower bridge arm submodule power of N+1 level carrier phase shift sinusoidal pulse width modulation strategy generating
The driving signal of device is closed, and with submodule function corresponding to each driving signal of the frequency of a power frequency period (0.02s) rotation
Rate switching device, to achieve the purpose that press.
2, the present invention reduces the communication line of system, and eliminate voltage acquisition without sampling submodule capacitor voltage
Module, and then improve system reliability.
Detailed description of the invention
Fig. 1 is the more level topological structures of traditional modular.
Fig. 2 is N+1 level carrier phase-shifted SPWM strategy schematic diagram.
Specific embodiment
Below in conjunction with attached drawing detailed description of the present invention embodiment.
Fig. 1 is the more level topological structures of traditional modular, by existing literature it is found that modular multilevel bridge arm current is main
It is as follows comprising DC component, fundamental component and two harmonics, expression way:
In formula, x=a, b, c, ipx、inxFor upper and lower bridge arm current, IdcFor DC current, IxElectric current width is exported for exchange side
Value, I2fFor two harmonic amplitudes, ω is network voltage angular frequency,For power-factor angle,For two frequency multiplication initial phase angles, t is
Time.
Submodule capacitor voltage value is related with charge and discharge time and charging and discharging currents.Since the present invention is using carrier wave phase
Move sinusoidal pulse width modulation strategy, it is known that the charge and discharge time of each submodule capacitor voltage just as.At this point, electric between causing each submodule
Appearance voltage is unbalanced the reason is that the electric current at charge and discharge moment is different.By formula (1) it is found that bridge arm current is a cycle letter
Number, the minimum period is power frequency period, that is, identical at interval of the charging and discharging currents of a power frequency period.It presses, can press to realize
Power frequency period carries out rotation to the driving signal of submodule.
Below by taking 1 bridge arm submodule turn-on sequence of table as an example, embodiments of the present invention are specifically described.
Table Bridge 1 arm submodule turn-on sequence
By taking a rotational cycle as an example, using upper and lower bridge arm of N+1 level carrier phase shift sinusoidal pulse width modulation strategy generating
The driving signal of modular power switching device；Specific alternating mode is as follows:
(1) initial time, respectively the corresponding triangle for generating driving signal of first submodule carries upper and lower bridge arm submodule
The initial phase angle of wave is 0, and the corresponding triangular carrier for generating driving signal of second submodule is relative to first submodule pair
2 π of the triangular carrier phase shift/N for the generation driving signal answered, the corresponding triangular carrier phase for generating driving signal of third submodule
The triangular carrier phase shift 2 πs/N that generates driving signal corresponding for second submodule, and so on, n-th submodule is corresponding
Generation driving signal triangular carrier relative to the N-1 submodule it is corresponding generate driving signal triangular carrier phase shift 2
The driving sequence of π/N, the above driving signal continue 0.02s (50Hz)；
(2) the 0.02s moment, driving signal corresponding to rotation bridge arm submodule at this time, specifically: upper and lower bridge arm submodule
Block respectively second submodule it is corresponding generate driving signal triangular carrier initial phase angle be 0, third submodule correspondence
Generation driving signal triangular carrier relative to second submodule it is corresponding generate driving signal 2 π of triangular carrier phase shift/
N, the corresponding triangular carrier for generating driving signal of the 4th submodule is relative to the corresponding generation driving letter of third submodule
Number 2 π of triangular carrier phase shift/N, and so on, the corresponding triangular carrier for generating driving signal of n-th submodule is relative to the
Corresponding 2 π of the triangular carrier phase shift/N for generating driving signal of N-1 submodule, the corresponding generation driving letter of first submodule
Number triangular carrier relative to corresponding 2 π of the triangular carrier phase shift/N for generating driving signal of n-th submodule, above driving is believed
Number driving sequence continue 0.02s；
(3) the 0.04s moment, driving signal corresponding to rotation bridge arm submodule, specifically: upper and lower bridge arm submodule is each
Initial phase angle from the corresponding triangular carrier for generating driving signal of third submodule is 0, the 4th corresponding life of submodule
2 π of triangular carrier phase shift/N at the triangular carrier of driving signal relative to the corresponding generation driving signal of third submodule, with
This analogizes, and the corresponding triangular carrier for generating driving signal of n-th submodule drives relative to the corresponding generation of the N-1 submodule
2 π of triangular carrier phase shift/N of dynamic signal, the corresponding triangular carrier for generating driving signal of first submodule is relative to n-th
Corresponding 2 π of the triangular carrier phase shift/N for generating driving signal of submodule, second submodule is corresponding to generate the three of driving signal
Angle carrier wave is relative to corresponding 2 π of the triangular carrier phase shift/N for generating driving signal of first submodule, the drive of the above driving signal
Dynamic sequence continues 0.02s；
(4) driving signal corresponding to bridge arm submodule of 0.02s rotation, at 0.02s × (N-1) moment, this
When the corresponding angle relationship of triangular carrier for generating driving signal of bridge arm submodule be: the respective n-th of upper and lower bridge arm submodule
The initial phase angle of the corresponding triangular carrier for generating driving signal of submodule is 0, the corresponding generation driving letter of first submodule
Number triangular carrier relative to n-th submodule it is corresponding generate driving signal 2 π of triangular carrier phase shift/N, second submodule
The corresponding triangular carrier for generating driving signal of block is relative to the corresponding triangular carrier for generating driving signal of first submodule
2 π of phase shift/N, the corresponding angle relationship of triangular carrier and so on for generating driving signal of remaining submodule, the above driving letter
Number driving sequence continue 0.02s；
(5) rotation of the driving signal of a cycle, driving signal and step (1) this moment are completed in 0.02s × n-hour
It is identical.
Claims (3)
1. a kind of modular multilevel submodule pressure equalizing control method, which is characterized in that be by the upper and lower bridge arm submodule of rotation
Turn-on sequence, so that it is able to achieve voltage balance control target without sampling submodule voltage；It is specific as follows:
Ensure that the angle of flow of the upper and lower device for power switching in upper and lower bridge arm in each submodule is complementary, and will not lead simultaneously
It is logical；The driving signal of each submodule device for power switching, N are generated using N+1 level carrier phase shift sinusoidal pulse width modulation strategy
Represent the number of each bridge arm submodule；The level carrier phase shift sinusoidal pulse width modulation strategy refers to, adjacent in upper and lower bridge arm
The triangular carrier difference of submodule successively 2 π of phase shift/N radian, and the modulating wave phase by pi radian of upper and lower bridge arm.
2. the method according to claim 1, wherein using N+1 level carrier phase shift sinusoidal pulse width modulation plan
Slightly come generate each submodule device for power switching driving signal when, it is corresponding for generating the three of driving signal with regard to each submodule
For the carrier wave of angle:
(1) it carves at the beginning, makes the initial phase angle 0 of the triangular carrier of first submodule, the triangle of second submodule carries
Wave is relative to the former 2 π of phase shift/N, triangular carrier phase shift 2 of the triangular carrier of third submodule relative to second submodule
π/N；And so on, triangular carrier phase shift 2 πs/N of the triangular carrier of n-th submodule relative to the N-1 submodule；More than
The driving sequence of driving signal continues 0.02s；
(2) driving signal corresponding to each submodule in the 0.02s moment, the upper and lower bridge arm of rotation, specifically:
Make the initial phase angle 0 of the triangular carrier of second submodule, the triangular carrier of third submodule is relative to the former phase
Move 2 π/N, triangular carrier phase shift 2 πs/N of the triangular carrier of the 4th submodule relative to third submodule；And so on, the
Triangular carrier phase shift 2 πs/N of the triangular carrier of N number of submodule relative to the N-1 submodule；The triangle of first submodule carries
Triangular carrier phase shift 2 πs/N of the wave relative to n-th submodule；The driving sequence of the above driving signal continues 0.02s；
(3) the 0.04s moment, driving signal corresponding to each submodule in the upper and lower bridge arm of rotation again, specifically:
Make the initial phase angle 0 of the triangular carrier of third submodule, the triangular carrier of the 4th submodule is relative to the former phase
Move 2 π/N；And so on, triangular carrier phase shift 2 πs/N of the triangular carrier of n-th submodule relative to the N-1 submodule；The
The triangle of triangular carrier phase shift 2 πs/N of the triangular carrier of one submodule relative to n-th submodule, second submodule carry
Triangular carrier phase shift 2 πs/N of the wave relative to first submodule；The driving sequence of the above driving signal continues 0.02s；
(4) referring to the mode of step (1)~(3), the drive corresponding to each submodule in 0.02s rotation once upper and lower bridge arm
Dynamic signal；It is in the angle relationship at 0.02s × (N-1) moment, each bridge arm submodule triangular carrier: makes in upper and lower bridge arm respectively
The initial phase angle of the triangular carrier of n-th submodule is 0, and the triangular carrier of first submodule is relative to n-th submodule
2 π of triangular carrier phase shift/N, triangular carrier phase shift 2 πs/N of the triangular carrier of second submodule relative to first submodule,
Angle relationship and so between the triangular carrier of remaining each submodule；The driving sequence of the above driving signal continues 0.02s；
(5) rotation of the driving signal of a cycle, driving signal this moment and phase in step (1) are completed in 0.02s × n-hour
Together.
3. according to the method described in claim 2, it is characterized in that, first submodule refers to uppermost son in bridge arm
Module, is successively second submodule, third submodule etc. downwards, and a bottom submodule is n-th submodule.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564504A (en) * | 2019-09-26 | 2021-03-26 | 新疆金风科技股份有限公司 | Control method and control device of modular multilevel converter |
| CN118367813A (en) * | 2024-06-20 | 2024-07-19 | 西安理工大学 | Capacitor voltage equalizing control method of modularized multi-level converter |
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| CN103441696A (en) * | 2013-09-06 | 2013-12-11 | 上海电气集团股份有限公司 | Cascade current transformer DC side self-voltage-stabilizing method |
| CN103795080A (en) * | 2014-01-23 | 2014-05-14 | 湖南大学 | Grid connection method of MMC-type light direct-current power transmission system |
| CN104393779A (en) * | 2014-11-13 | 2015-03-04 | 西安交通大学 | Modular multilevel converter control method based on carrier disposition modulation |
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2018
- 2018-10-14 CN CN201811193185.7A patent/CN109256971A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN101951162A (en) * | 2010-09-06 | 2011-01-19 | 东北电力大学 | Pulse width control method of modular multilevel converter |
| CN103441696A (en) * | 2013-09-06 | 2013-12-11 | 上海电气集团股份有限公司 | Cascade current transformer DC side self-voltage-stabilizing method |
| CN103795080A (en) * | 2014-01-23 | 2014-05-14 | 湖南大学 | Grid connection method of MMC-type light direct-current power transmission system |
| CN104393779A (en) * | 2014-11-13 | 2015-03-04 | 西安交通大学 | Modular multilevel converter control method based on carrier disposition modulation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112564504A (en) * | 2019-09-26 | 2021-03-26 | 新疆金风科技股份有限公司 | Control method and control device of modular multilevel converter |
| CN112564504B (en) * | 2019-09-26 | 2023-09-22 | 金风科技股份有限公司 | Control method and control device of modularized multi-level converter |
| CN118367813A (en) * | 2024-06-20 | 2024-07-19 | 西安理工大学 | Capacitor voltage equalizing control method of modularized multi-level converter |
| CN118367813B (en) * | 2024-06-20 | 2024-08-30 | 西安理工大学 | Capacitor voltage equalizing control method of modularized multi-level converter |
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