CN105915076B - A kind of modularization multi-level converter and its control method - Google Patents
A kind of modularization multi-level converter and its control method Download PDFInfo
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- CN105915076B CN105915076B CN201610335317.XA CN201610335317A CN105915076B CN 105915076 B CN105915076 B CN 105915076B CN 201610335317 A CN201610335317 A CN 201610335317A CN 105915076 B CN105915076 B CN 105915076B
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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
-
- 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
-
- 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
- H02M1/0074—Plural converter units whose inputs are connected in series
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Traffic Control Systems (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of modularization multi-level converter and its control methods, propose a kind of control program of new modular multilevel, and no matter this control strategy is all a kind of new mode from control algolithm or from control structure；By the way of communicating between valve group, by the communication between adjacent valve group, realize that the voltage of entire bridge arm is shared, i.e., each valve group can obtain the voltage signal of an any other valve group from adjacent valve group；Each valve group knows the accurate control achieved that after the voltage ranking of this valve group to submodule, and it is thus achieved that valve group voltage stabilization, and the case where for breaking down between communication, makes system remain to stable operation in the case where simplex is interrupted and enhances the stability of system by algorithm.
Description
Technical field
The present invention relates to a kind of control methods of modular multilevel, belong to power electronics field, mainly for mould
The more situation of block number is applied to high-power occasion more.
Background technique
With the popularization and application of the HVDC transmission system based on voltage source type converter in the power system, core
Partial high-power voltage-type transformer also becomes direction and the hot spot of research instantly.HVDC Light is solving to hand over
Streaming system cannot synchronize interconnection, and the power supply of Xiang Wuyuan load meets the fermentation such as environmental protection with very big advantage.MMC is a kind of
New Cascading type multi-level converter, topological structure high modularization, and there is direct current common bus, therefore be highly suitable for straight
Flow transmission system.Modular multilevel (MMC) changes the shortcoming of traditional multi-level converter with distinctive structural advantage.
But since modularization multi-level converter is by the levitating type DC capacitance voltage value pair in power cell valve group
DC voltage is divided, and voltage step needed for providing synthesis ac output voltage, therefore valve group capacitance voltage
Stabilization is extremely important to the reliability service of MMC.Also, when requiring pressure-bearing to increase, modularization quantity necessarily increases therewith, and right
In nearest level approximatioss, a good control strategy is steady for the stabilization of control voltage, the speed of control and whole system
Surely it plays a crucial role.
In the occasion of some high-powers, bridge arm is usually formed by several hundred a sub-module cascades.Each submodule
Control be all it is separated, result in that control task is very heavy, this just increases the requirement to control strategy.
For the more situation of the valve group in modularization multi-level converter, effective control method and few now, and
Two-stage grade is proposed in " a kind of control system and its application method of modularization multi-level converter " patent of Zhejiang University
The method of control, that is, be divided into main control unit control valve group and valve group internal control, and valve group voltage is passed to main control module, master control respectively
Module again feeds back control signal into each valve group, and this control method is after some valve group and the communicating interrupt of master control
System is unable to operate stably.In the present invention, the strategy communicated between a kind of adjacent valve group is proposed, and then is realized in bridge arm
The voltage of all valve groups is shared, avoids the case where certain road communicating interrupt leads to system irregular operating or collapse.The present invention
The control algolithm of " saturation throw-in play " even more is proposed for the communication modes, and then simplifies the structure of system on the whole,
Further alleviate the pressure of control module.
Summary of the invention
Technical problem: the present invention proposes a kind of modularization multi-level converter and its control method, in the big function of high pressure
Under rate occasion, the application of modularization multi-level converter improves system control speed and system stability.
Technical solution: a kind of modularization multi-level converter, including L1A bridge arm and L1What a and bridge arm was arranged in a one-to-one correspondence
Bridge arm controls signal generation unit；The bridge arm control signal generation unit can generate total submodule that corresponding bridge arm need to be put into
Quantity；
Each bridge arm includes n valve group, and each valve group includes a submodule and a valve group control unit；The valve group
Control unit includes sorting module and submodule on-off control unit；The sorting module can calculate all submodules in this valve group
The average voltage of block receives the average voltage that other valve groups are calculated in addition to this valve group on bridge arm, and flat according to voltage
The height of mean value is ranked up valve group；The submodule on-off control unit can control all submodules in corresponding valve group
Investment and excision.
Electrical isolation two-by-two between all valve groups on single bridge arm utilizes communication between the adjacent valve group on single bridge arm
Optical fiber connects to form loop；The communication line of this method simplification very big from topology.That is: each valve group valve group adjacent with two sides
Between be separately connected incoming traffic all the way and all the way outputting communication so that any road incoming traffic or outputting communication of any valve group
After interruption, which is all still corresponding with incoming traffic all the way or outputting communication connection, keeps in communication.
Further, it is the control in simplified module, mitigates the pressure of control unit, and keep whole system easier to operate,
" saturation control strategy " now is proposed for this system, and the present invention also provides a kind of controlling parties of modularization multi-level converter
Method, the specific steps are as follows:
Step 1: bridge arm control signal generation unit generates total submodule quantity L that corresponding bridge arm need to be put into；
Step 2: valve group control unit calculates the average voltage of all submodules in this valve group, receive on bridge arm except this
The average voltage that other outer valve groups of valve group are calculated, and valve group is ranked up according to the height of average voltage；
Step 3: the control method of valve group input quantity；It is specific as follows:
N1=L-MN
Wherein: M is the submodule quantity of each valve group, and N is the quantity of the valve group completely put into, and n1 is completely to have put into also to need to throw
The submodule quantity entered；
Step 4: the distribution method of valve group investment submodule；It is specific as follows:
When electric current charging, i.e. i > 0, the lower N number of valve group of average voltage puts into whole submodules, remaining submodule
Come N+1 valve group investments from low to high by average voltage；
When working as current discharge, i.e. i < 0, the higher N number of valve group of average voltage puts into whole submodules, remaining submodule
Block is then come N+1 valve group investments from high to low by average voltage.
Further, the distribution method for needing the submodule of investment has completely been put into also；It is specific as follows:
When electric current charging, i.e. i > 0, it is lower to come voltage value in N+1 valve groups from low to high by average voltage
N1 submodule investment；
When working as current discharge, i.e. i < 0, it is higher to come voltage value in N+1 valve groups from high to low by average voltage
N1 submodule investment.
Further, now its circuit stability is improved, makes it still can be steady in the case where communicating interrupt all the way
Fixed operation.Valve group number is n in known single bridge arm, then the voltage signal that a valve group need to receive is at least n-1, control
Per incoming traffic all the way perhaps voltage signal m >=n-1 in outputting communication then any road incoming traffic of any valve group or
After outputting communication interrupts, the incoming traffic or outputting communication of the valve group other side can receive at least n-1 voltage signal,
And the voltage signal of itself is sent to whole system；That is: only break an incoming traffic or when outputting communication, and all valve groups are logical
News are all unaffected.
The utility model has the advantages that
(1) information transmitting of the communication between adjacent valve group, non-conterminous valve group then need to pass by adjacent valve group between valve group
Pass information of voltage.Each valve group can obtain the average-voltage signal of an any other valve group from adjacent valve group.And it is each
Valve group is only it is to be understood that the average voltage ranking of oneself, the movement of its submodule of energy autonomous control.
(2) each valve group is independent and identical for the level of system, and be galvanically isolated.
(3) it is accurately realized by the shared average-voltage signal for receiving other all valve groups to submodule between valve group
Control.
(4) when only breaking a communication path, all valve groups are all unaffected.Because any valve group can pass through
Two branches receive any other voltage signal.When communication path interrupts, the electricity of the valve group adjacent with the access
Pressure signal then can share to whole system by another adjacent access.
Detailed description of the invention
Fig. 1 is 4*4MMC triphase flow；
Fig. 2 is valve group internal control schematic diagram；
Fig. 3 is system control principle drawing；
Fig. 4 is that emulation valve group voltage signal shares schematic diagram；
Fig. 5 is submodule block models；
Fig. 6 is that upper and lower bridge arm puts into submodule quantity；
Fig. 7 is single-phase MMC output voltage；
Fig. 8 is upper and lower bridge arm output voltage；
Fig. 9 is submodule voltage value in valve group；
Figure 10 voltage value between valve group；
Figure 11 is the control signal of single switching transistor；
Figure 12 is the quantity of investment submodule in each valve group；
Figure 13 is to disconnect communicating single-phase MMC output voltage waveforms all the way；
Figure 14 is system construction drawing.
Appendage explanation
Program 1 is valve group internal sort program；
Program 2 is the switch controlled program inside valve group；
Program 3 is that submodule number controls program in valve group；
Specific embodiment
The present invention will be further described below with reference to the drawings.
As shown in Fig. 1,14, a kind of modularization multi-level converter, including L1A bridge arm and L1It is a to be set with bridge arm one-to-one correspondence
The bridge arm control signal generation unit set；The bridge arm control signal generation unit can generate total son that corresponding bridge arm need to be put into
Module number.
Each bridge arm includes n valve group, and each valve group includes a submodule and a valve group control unit；The valve group
Control unit includes sorting module and submodule on-off control unit；The sorting module can calculate all submodules in this valve group
The average voltage of block receives the average voltage that other valve groups are calculated in addition to this valve group on bridge arm, and flat according to voltage
The height of mean value is ranked up valve group；The submodule on-off control unit can control all submodules in corresponding valve group
Investment and excision.Specific as follows: each submodule includes the switching tube (as shown in Figure 5) of upper and lower two complementary conductings, passes through valve
When group control unit controls a switching tube conducting, submodule investment, when another switching tube is connected, submodule excision, thus
Change the working method of submodule.
Electrical isolation two-by-two between all valve groups on single bridge arm utilizes communication between the adjacent valve group on single bridge arm
Optical fiber connects to form loop；The communication line of this method simplification very big from topology.That is: each valve group valve group adjacent with two sides
Between be separately connected incoming traffic all the way and all the way outputting communication so that any road incoming traffic or outputting communication of any valve group
After interruption, which is all still corresponding with incoming traffic all the way or outputting communication connection, keeps in communication.
As shown in Figure 2,3, to simplify the control in module, mitigate the pressure of control unit, and whole system is made to be easier to grasp
Make, now propose " saturation control strategy " for this system, the specific steps are as follows:
Step 1: bridge arm control signal generation unit generates total submodule quantity L that corresponding bridge arm need to be put into；
Step 2: valve group control unit calculates the average voltage of all submodules in this valve group, receive on bridge arm except this
The average voltage that other outer valve groups of valve group are calculated, and valve group is ranked up according to the height of average voltage；
Step 3: the control method of valve group input quantity；It is specific as follows:
N1=L-MN
Wherein: M is the submodule quantity of each valve group, and N is the quantity of the valve group completely put into, and n1 is completely to have put into also to need to throw
The submodule quantity entered；
Step 4: the distribution method of valve group investment submodule；It is specific as follows:
When electric current charging, i.e. i > 0, the lower N number of valve group of average voltage puts into whole submodules, remaining submodule
Come N+1 valve group investments from low to high by average voltage；
When working as current discharge, i.e. i < 0, the higher N number of valve group of average voltage puts into whole submodules, remaining submodule
Block is then come N+1 valve group investments from high to low by average voltage.
The distribution method for needing the submodule of investment is completely put into also；It is specific as follows:
When electric current charging, i.e. i > 0, it is lower to come voltage value in N+1 valve groups from low to high by average voltage
N1 submodule investment；
When working as current discharge, i.e. i < 0, it is higher to come voltage value in N+1 valve groups from high to low by average voltage
N1 submodule investment.
Now its circuit stability is improved, makes it still can be with stable operation in the case where communicating interrupt all the way.?
Know that valve group number is n in single bridge arm, then the voltage signal that a valve group need to receive is at least n-1, control is per defeated all the way
Enter any road incoming traffic or outputting communication of voltage signal m >=n-1 of the communication perhaps in outputting communication then any valve group
After interruption, the incoming traffic or outputting communication of the valve group other side can receive at least n-1 voltage signal, and by itself
Voltage signal be sent to whole system；That is: only break an incoming traffic or when outputting communication, and all valve groups communications all will not
It is affected.
It makes a concrete analysis of as follows: setting in a bridge arm that valve group number is n, then the voltage that a valve group need to receive is at least n-
1, at least m=(n-1)/2 voltage signal in an access, if (n-1)/2 is not integer, an access at least m
+ 1 signal of=INT ((n-1)/2).Assuming that existing m=(n-1)/2 or m=INT ((n-1)/2)+1, when in an access
It has no progeny, the valve group being connected with this access can only receive the voltage signal of half, and only opposite with this access one (n is
Odd number) or 2 (n is even number) valve groups be unaffected.And when m increase when will not be impacted valve group also will increase.Work as m >
When=n-1, when only breaking a communication path, because the access of the corresponding other side is able to maintain communication, voltage signal is total to
It enjoys to whole system, then all valve groups are all unaffected.
The feasibility of the control strategy is verified now in conjunction with the MMC simulation model for building 4*4 based on plecs.Such as Fig. 4 institute
Show, by taking four modules as an example (as 4*4), single bridge arm submodule number range is normal to system i.e. from 0-16, and operation m is at least
It is 2, is operated normally to system when single communication access interrupts, m is at least 3, and (m is the voltage signal that every access contains
Number).And for five modules, normal to system, operation m is at least 2, normally transports to system when single communication access interrupts
Row, m are at least 4.
This emulation approaches sinusoidal nearest level approximatioss, the two-stage control used on control strategy using 16 level
Method processed, using " saturation throw-in play " in control method, the mode that communication modes are communicated with each other using intermodule.It is existing
Simulation work mode is described in detail:
The submodule investment number of complementary upper and lower bridge arm is generated first as shown in fig. 6, and certainly according to " saturation throw-in play "
The submodule of fixed each valve group investment.
And the control in valve group level, then it is to determine for the average voltage ranking results of submodule inside each valve group
Fixed, and main control unit can be transmitted to by each valve group in terms of valve group information of voltage transmitting, master control list can also be cancelled
Member is directly individually controlled by each valve group by the information sharing between valve group again, and this control method can be with the steady of strengthen the system
It is qualitative, it eliminates simplex and interrupts influence of this fortuitous event for system.As shown in figure 4, to be with the MMC model of 4*4
, voltage signal transfer mode between valve group.The voltage that valve group 1 is transmitted to valve group 2 is the average electricity of valve group 1, valve group 4, valve group 3
Pressure, i.e., other all voltage values in addition to valve group 2.For valve group 1, it can obtain valve group 3 from valve group 2 and valve group 4 respectively
Voltage, for the two valve groups 3 voltage signal we take higher person, this be in order to prevent all the way communicating interrupt the case where.
After the voltage signal for obtaining all valve groups, then it can determine whether voltage ranking of the valve group in all valve groups, to determine valve group
The submodule number of inside investment, as shown in figure 12.Submodule number control program is as follows in valve group:
Program 3:
Int t, i, n, out, k=0；
Double in [6]={ IN0, IN1, IN2, IN3, IN4, IN5 }；
N=in [3]/4；
If (in [4] < 0) // electric current is negative value
{ t=0；
K=k+1；
OUT1=k；
For (i=0；i<3；I++) // sort from large to small
{
if(in[i]>in[5])
T=t+1；
}
}
If (in [4] > 0) // electric current is positive
{ t=0；
For (i=0；i<3；I++) // from small to sequence
{
if(in[i]<in[5])
T=t+1；
}
}
OUT1=n；
OUT2=t；
If (t==n)
Out=in [3] -4*n；Residue need to put into submodule number after // saturation investment
if(t<n)
Out=4；
if(t>n)
Out=0；
OUT0=out；
For example, when upper bridge arm need to put into 5 submodules, and lower bridge arm need to put into 11 submodules, for upper bridge arm, if
Electric current is positive, i.e., submodule charges, and the smallest valve group of average voltage is completely put into, and a remaining submodule is by average voltage the
Two small valve groups put into the wherein the smallest submodule of voltage.
As shown in Fig. 2, for collected voltage signal, passing through sorting module (sequence mould first inside single valve group
Block program is as shown in program 1) submodule investment number in ranking results recombination current direction and valve group is obtained, according to control plan
Slightly (control strategy program is as shown in program 2) carrys out the conducting of control switch pipe, as shown in figure 11, i.e., the investment of submodule and cuts
It removes, as shown in figure 5, its upper and lower two switching tube is complementary conducting, when switching tube above is connected, submodule is put into, when following
Switching tube conducting, submodule excision.
Program 1:
Int t=0, i, j；
Double in [4]={ IN0, IN1, IN2, IN3 }；Submodule voltage inside // valve group
Int arr [4]={ 1,2,3,4 }；
For (i=0；i<3；I++) // sequence
{
For (j=0；j<3；j++)
{
if(arr[j+1]-arr[j]>0)
{
if(in[j+1]>in[j])
{ t=arr [j+1]；Arr [j+1]=arr [j]；Arr [j]=t；
}
}
}
}
OUT0=arr [0]；The corresponding sequence of // tetra- voltages
OUT1=arr [1]；
OUT2=arr [2]；
OUT3=arr [3]；
Program 2:
int i,j；
Double in [6]={ IN0, IN1, IN2, IN3, IN4, IN5 }；
Int out [4]={ 0 }；
If (in [5]≤0) // and when electric current is negative value, submodule discharges
{
Out [0]=1；
Out [2]=1；
Out [1]=1；
Out [3]=1；
For (i=1；i<5-in[4]；I++) // investment high for voltage is discharged
{
For (j=0；j<4；j++)
If (in [j]==i)
{ out [j]=0；
}
}
}
If (in [5] > 0) // electric current is positive value, submodule charging
{
Out [0]=0；
Out [2]=0；
Out [1]=0；
Out [3]=0；
For (i=4；i>4-in[4]；i--)
{
For (j=0；j<4；j++)
If (in [j]==i)
Out [j]=1；
}
}
OUT0=out [0]；
OUT1=out [1]；
OUT2=out [2]；
OUT3=out [3]；
With regard to average voltage such as Fig. 9 in the voltage and valve group of each submodule, shown in Figure 10, voltage stabilization is balanced.
Realize the pressure of submodule and valve group.
As shown in fig. 7, output voltage, which realizes 16 level, approaches sinusoidal output voltage, then comparative diagram 13, disconnect all the way
After communication, output voltage waveforms do not change substantially, as demonstrate the stability of system.
As shown in figure 8, upper and lower bridge arm voltage realizes complementation, i.e., the sum of upper and lower bridge arm voltage is constant.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of control method of modularization multi-level converter, it is characterised in that:
A kind of modularization multi-level converter includes L1A bridge arm and L1A bridge arm control being arranged in a one-to-one correspondence with bridge arm is believed
Number generate unit；The bridge arm control signal generation unit can generate total submodule quantity that corresponding bridge arm need to be put into；
Each bridge arm includes n valve group, and each valve group includes a submodule and a valve group control unit；The valve group control
Unit includes sorting module and submodule on-off control unit；Electrical isolation two-by-two between all valve groups on single bridge arm, it is single
It connects to form loop using communication optical fiber between adjacent valve group on a bridge arm；That is: between each valve group valve group adjacent with two sides
It is separately connected incoming traffic all the way and all the way outputting communication, so that in any road incoming traffic or outputting communication of any valve group
It has no progeny, which is all still corresponding with incoming traffic all the way or outputting communication connection, keeps in communication；
Specific step is as follows for this method:
Step 1: bridge arm control signal generation unit generates total submodule quantity L that corresponding bridge arm need to be put into；
Step 2: valve group control unit calculates the average voltage of all submodules in this valve group, receive on bridge arm except this valve group
The average voltage that other outer valve groups are calculated, and judge this valve group in all valve groups according to obtained average voltage Value Data
In voltage ranking；
Step 3: the control method of valve group input quantity；It is specific as follows:
N1=L-MN
Wherein: M is the submodule quantity of each valve group, and N is the quantity of the valve group completely put into, and n1 is completely to have put into also to need investment
Submodule quantity；
Step 4: the distribution method of valve group investment submodule；It is specific as follows:
When electric current charging, i.e. i > 0, the lower N number of valve group of average voltage puts into whole submodules, and remaining submodule is by electricity
Flatten the valve group investment that mean value comes N+1 from low to high；
When working as current discharge, i.e. i < 0, the higher N number of valve group of average voltage puts into whole submodules, and remaining submodule is then
Come N+1 valve group investments from high to low by average voltage.
2. the control method of modularization multi-level converter according to claim 1, it is characterised in that: completely having put into also needs
The distribution method of the submodule of investment；It is specific as follows:
When electric current charging, i.e. i > 0, the lower n1 of voltage value in N+1 valve groups is come from low to high by average voltage
A submodule investment；
When working as current discharge, i.e. i < 0, the higher n1 of voltage value in N+1 valve groups is come from high to low by average voltage
A submodule investment.
3. the control method of modularization multi-level converter according to claim 2, it is characterised in that: known single bridge arm
Interior valve group number is n, then the voltage signal that a valve group need to receive is at least n-1, control per incoming traffic all the way or
Voltage signal m >=n-1 in outputting communication, then after any road incoming traffic or outputting communication of any valve group interrupt, the valve
The incoming traffic or outputting communication of the group other side can receive at least n-1 voltage signal, and by the voltage signal of itself
It is sent to whole system；That is: only break an incoming traffic or when outputting communication, and all valve groups communications are all unaffected.
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| CN106655846B (en) * | 2016-11-24 | 2023-11-17 | 南方电网科学研究院有限责任公司 | Modularized multi-level converter control system and control method |
| CN106685197A (en) * | 2017-03-09 | 2017-05-17 | 北京四方继保自动化股份有限公司 | Optical fiber communication interface circuit applied to modularized multi-electrical-level converter bridge arm power module |
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