CN106849696A - One kind mixing Shuangzi module MMC pressure equalizing control methods and device - Google Patents
One kind mixing Shuangzi module MMC pressure equalizing control methods and device Download PDFInfo
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- CN106849696A CN106849696A CN201710063388.3A CN201710063388A CN106849696A CN 106849696 A CN106849696 A CN 106849696A CN 201710063388 A CN201710063388 A CN 201710063388A CN 106849696 A CN106849696 A CN 106849696A
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Classifications
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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
- 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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention proposes a kind of mixing Shuangzi module MMC pressure equalizing control methods and device, for any one bridge arm, according to the positive and negative of the summation of voltage difference positive and negative in bridge arm current direction, the module of whole bridge arm and input submodule number, integrated voltage index to each submodule is ranked up, and determines the corresponding output state of each submodule；The integrated voltage index and capacitance voltage in module and, capacitance voltage is poor relevant in module.Intermodule sequence Pressure and Control of the present invention based on integrated voltage index, the balanced capacitance voltage and module between of inside modules capacitance voltage effect in a balanced way is realized, good voltage equalizing can be opened under the various working such as the startup for mixing Shuangzi module MMC systems, normal operation, fault traversing.
Description
Technical field
The invention belongs to Power System Flexible technical field of direct current power transmission, and in particular to MMC is equal for one kind mixing Shuangzi module
Pressure control method and device.
Background technology
Direct-current short circuit failure is a kind of most commonly seen failure of MMC-HVDC systems, and the MMC based on semibridge system submodule is changed
Stream device, as shown in Fig. 1-a, AC system cannot be cut off to straight in DC bipolar short trouble by locking submodule IGBT
The energy regenerative loop of flow short-circuit point, it is necessary to which, to remove fault current, this is not only for faster trip AC circuit breaker or direct-current isolating switch
System cost is increased, the technical requirements to equipment are improve, while also reducing system operational percentage, has slowed down fault recovery speed
Degree.
Use that manufacture difficulty is big, high cost direct current cables laying-out is sent out to reduce DC Line Fault in current engineering mostly
Raw rate, but can not be from the basic treatment Problem of Failure for solving semibridge system MMC transverters to DC Line Fault.In consideration of it, by changing
Stream device itself control realization fault current self-cleaning turns into a kind of most economical effective method, and also causing to find has DC Line Fault
The transverter topology of ride-through capability turns into research tendency.
The MMC submodule topologys with DC Line Fault self-cleaning ability have full-bridge submodule, clamper Shuangzi module etc. at present,
Respectively as shown in Fig. 1-b, Fig. 1-c.Wherein, full-bridge submodular MMC is more using power device, and initial investment cost and system are transported
Row loss is very big；And clamper Shuangzi modular MMC can not export negative level, do not possess not locking STATCOM operation troubles and pass through
Ability, cuts the ability for not possessing lifting system capacity.
In view of the respective shortcoming of above two submodule, application publication number is that the Chinese patent document of CN104993716A is carried
Go out a kind of mixing Shuangzi module, as shown in Fig. 2 it has the two advantage concurrently, cost of investment is relatively low, is provided simultaneously with closing
Lock fault ride-through capacity and STATCOM operation troubles ride-through capabilities, the negative level way of output can improve system modulation degree, go forward side by side
And lifting system capacity.But the Pressure and Control strategy of routine MMC systems can not meet its equal pressure request, therefore it is a kind of to need proposition badly
Suitable for the system Pressure and Control strategy of mixing Shuangzi module MMC.
The content of the invention
It is suitable to realize simultaneously it is an object of the invention to provide one kind mixing Shuangzi module MMC pressure equalizing control methods and device
For the Pressure and Control in the module for mixing Shuangzi module with intermodule.
In order to solve the above technical problems, the technical scheme is that：
The present invention provides a kind of mixing Shuangzi module MMC pressure equalizing control methods, for any one bridge arm, according to bridge arm current
The summation of voltage difference is positive and negative and input submodule number positive and negative in direction, the module of whole bridge arm, to each submodule
Integrated voltage index is ranked up, and determines the corresponding output state of each submodule；The integrated voltage index and electric capacity in module
Voltage is poor relevant with capacitance voltage in, module.
Further, when input submodule number is timing, integrated voltage index is capacitance voltage and and module in module
The weighted sum of interior capacitance voltage difference；When put into submodule number for it is negative when, integrated voltage index be in module capacitance voltage and with
The weighted difference of capacitance voltage difference in module.
Further, a bridge arm includes N number of submodule, and each submodule includes 2 subelements；
When input submodule number is for just, when modulating wave need to export M subelement, submodule output state includes single capacitor
Voltage, double capacitance voltages and excision：
Bridge arm current direction is timing, by the N that integrated voltage index is minimum1Individual submodule exports single capacitor voltage, voltage
Highest N2Individual submodule excision, the double capacitance voltages of other submodules output；
When bridge arm current direction is to bear, by the N that integrated voltage index is minimum3Individual submodule excision, voltage highest N4Height
Module exports single capacitor voltage, the double capacitance voltages of other submodules output；
When submodule number is put into bear, when modulating wave needs-M subelement of output, submodule output state includes negative
To capacitance voltage and excision：
Bridge arm current direction is timing, by M submodule output negative sense capacitance voltage of integrated voltage index highest, other
Submodule cuts off；
When bridge arm current direction is to bear, M minimum submodule of integrated voltage index is exported into negative sense capacitance voltage, other
Submodule cuts off；
Wherein, N, M, N1、N2、N3And N4It is natural number.
Further, if the summation of capacitance voltage difference is just N in module1=M%2, N2=N-N1–M/2；If M >=N,
Then N4=2N-M, N3=0；If M<N, then N4=M, N3=N-M；
If the summation of capacitance voltage difference is negative, N in module4=M%2, N3=N-N4–M/2；If M >=N, N1=2N-
M, N2=0；If M<N, then N1=M, N2=N-M；Wherein, % is represented and is taken the remainder operation.
The present invention also provides a kind of mixing Shuangzi module MMC voltage-stabilizing controllers, for any one bridge arm, including for root
According to the positive and negative of the summation of voltage difference positive and negative in bridge arm current direction, the module of whole bridge arm and input submodule number, to every
The integrated voltage index of individual submodule is ranked up, and determines the module of the corresponding output state of each submodule；The integrated voltage
Index and capacitance voltage in module and, capacitance voltage is poor relevant in module.
Further, when input submodule number is timing, integrated voltage index is capacitance voltage and and module in module
The weighted sum of interior capacitance voltage difference；When put into submodule number for it is negative when, integrated voltage index be in module capacitance voltage and with
The weighted difference of capacitance voltage difference in module.
Further, a bridge arm includes N number of submodule, and each submodule includes 2 subelements：
When input submodule number is for just, when modulating wave need to export M subelement, submodule output state includes single capacitor
Voltage, double capacitance voltages and excision：
Bridge arm current direction is timing, by the N that integrated voltage index is minimum1Individual submodule exports single capacitor voltage, voltage
Highest N2Individual submodule excision, the double capacitance voltages of other submodules output；
When bridge arm current direction is to bear, by the N that integrated voltage index is minimum3Individual submodule excision, voltage highest N4Height
Module exports single capacitor voltage, the double capacitance voltages of other submodules output；
When submodule number is put into bear, when modulating wave needs-M subelement of output, submodule output state includes negative
To capacitance voltage and excision：
Bridge arm current direction is timing, by M submodule output negative sense capacitance voltage of integrated voltage index highest, other
Submodule cuts off；
When bridge arm current direction is to bear, M minimum submodule of integrated voltage index is exported into negative sense capacitance voltage, other
Submodule cuts off；
Wherein, N, M, N1、N2、N3And N4It is natural number.
Further, if the summation of capacitance voltage difference is just N in module1=M%2, N2=N-N1–M/2；If M >=N,
Then N4=2N-M, N3=0；If M<N, then N4=M, N3=N-M；
If the summation of capacitance voltage difference is negative, N in module4=M%2, N3=N-N4–M/2；If M >=N, N1=2N-
M, N2=0；If M<N, then N1=M, N2=N-M；Wherein, % is represented and is taken the remainder operation.
Beneficial effects of the present invention：
The present invention can export four kinds of voltage status for mixing Shuangzi module, the module, respectively twice capacitance voltage,
Capacitance voltage, no-voltage and negative sense capacitance voltage.There are two electric capacity in mixing Shuangzi inside modules, it is impossible to such as clamper Shuangzi module
The input excision control of the same two capacitors is separate, it is necessary to realize electricity in module while realizing that intermodule is pressed
Pressure is balanced.
Intermodule sequence Pressure and Control of the present invention based on integrated voltage index, realize inside modules capacitance voltage balanced
The capacitance voltage effect in a balanced way and module between.Specific regulation single capacitor voltage output submodule number, reaches whole bridge arm
Module voltage difference summation level off to zero purpose, coordinate the mould of the integrated voltage index based on the poor factor of builtin voltage containing submodule
Sorted between block Pressure and Control, realize two capacitance voltages of any submodule inside effect in a balanced way.
Wherein, when input submodule number is timing, integrated voltage index be in module capacitance voltage and with electricity in module
Hold the weighted superposition of voltage difference；When submodule number is put into bear, integrated voltage index is capacitance voltage and and mould in module
The weighting of capacitance voltage difference asks poor in block.The present invention can effectively realize the equilibrium of whole submodule capacitor voltages in bridge arm,
Good pressure effect can be opened under the various workings such as startup, normal operation, fault traversing in mixing Shuangzi module MMC systems
Really.
Brief description of the drawings
Fig. 1-a are half-bridge submodule figures；
Fig. 1-b are full-bridge submodule figures；
Fig. 1-c are clamper Shuangzi module maps；
Fig. 2 is the transverter figure for mixing Shuangzi module and its composition；
Fig. 3 is the pie graph for mixing Shuangzi module；
Fig. 4 is system Pressure and Control block diagram.
Specific embodiment
To make the purpose of the present invention, advantage and technical scheme clearer, below in conjunction with the accompanying drawings and embodiment, to the present invention
It is described in further detail.
As shown in Figure 2 and Figure 3, mixing Shuangzi module is made up of 4 IGBT and 2 module capacitances.Mixing Shuangzi module can be near
Seemingly think to be combined by two half-bridge cells.Following table is the working condition for mixing Shuangzi module.
Table 1 mixes Shuangzi module working condition table
As can be seen from the above table, mixing Shuangzi module can export 4 kinds of voltages, respectively double capacitance voltages, single capacitor electricity
Pressure, no-voltage and negative sense capacitance voltage.And, when input submodule number is timing, submodule output voltage is to that should have when single
Capacitance voltage, three kinds of states of double capacitance voltages and zero (cutting off), when submodule number is put into bear, submodule output voltage
To that should have negative sense capacitance voltage and zero (cutting off) two states.Then illustrate that the submodule can replace 2 half-bridge submodules defeated
While going out double capacitance voltages, possess the negative voltage characteristic of full-bridge submodule, DC voltage utilization rate can be improved, lifting system is held
Amount.
In short, mixing Shuangzi module only used 4 IGBT and 2 capacitors, that is, full-bridge submodule is realized with half
The effect of bridge submodule series connection, but the latter has used 6 IGBT and 2 capacitors.Shuangzi module MMC is all kinds of with existing for mixing
MMC topologys are compared, and have that device is few, capacity is high passes through the multinomial advantage such as function with DC Line Fault concurrently.
There are two capacitors in mixing Shuangzi inside modules, but can not two throwings of capacitor as clamper Shuangzi module
Enter excision control separate.As can be seen from Table 1, when submodule exports single capacitor voltage, input electric capacity C can only be selected2,
And when submodule exports negative sense capacitance voltage, can only select reversely to put into electric capacity C1。
When in the constant time period of bridge arm current direction, two capacitance voltage differences will be incrementally increased.Such as when bridge arm current side
It is to being timing, then positive to put into electric capacity C2Capacitance voltage will be caused to increase, reversely input electric capacity C1Capacitance voltage will be caused to reduce,
Two capacitance variations are consistent under other states.It is when bridge arm current direction is to bear, then positive to put into electric capacity C2Electric capacity electricity will be caused
Pressure reduces, anti-phase input electric capacity C1Capacitance voltage will be caused to increase.In the time period, two capacitance voltage differences will be incrementally increased.
This requires that mixing Shuangzi module MMC inverter system Pressure and Control strategy is needed while between considering submodule and sub
The capacitance voltage voltage-sharing of inside modules.
Fig. 4 gives system Pressure and Control block diagram, and the system Pressure and Control strategy realizes mould by two control devices
Block internal capacitance presses two control purposes of capacitor voltage equalizing and module between.Two control devices are respectively and control different voltages defeated
The submodule number that does well and carry out intermodule sequence Pressure and Control using module synthesis voltage indexes.
Inside modules capacitor voltage equalizing is realized by two aspects, first by controlling voltage difference in the module of whole bridge arm
Summation levels off to zero, and the builtin voltage difference of its secondary control disparate modules is balanced.
When determination subelement puts into number, mixing Shuangzi module has two kinds of forward voltage output states, can flexibly adjust
Save the number of the submodule of different voltage outputs.Whole bridge can be realized by controlling the submodule number of single capacitor voltage output
The module voltage difference summation of arm levels off to zero.It is specific as follows：
When bridge arm current is timing, electric capacity C2With C1Voltage difference (Uc2-Uc1) will incrementally increase.Now, if whole bridge arm
Module in voltage difference summation be just (Σ (Uc2-Uc1) ＞ 0), then reduce the submodule of single capacitor voltage output in the bridge arm
Number, makes voltage difference absolute value slower speed in module increase, if voltage difference summation is negative (Σ (Uc2-Uc1) ＜ 0), then increase
The submodule number of single capacitor voltage output in the bridge arm, makes voltage difference absolute value in module progressively reduce.When bridge arm current is
When negative, otherwise.
Using module voltage difference for index carries out intermodule sequence Pressure and Control, builtin voltage is poor between realizing disparate modules
Equilibrium, coordinate in the module of whole bridge arm that voltage difference is consistent, the effect of each submodule internal capacitance electric voltage equalization can be reached
Really.
Capacitor voltage equalizing between module, it is possible to use module submodule voltage is voltage-controlled for index carries out intermodule sequence
System, so as to realize disparate modules between electric voltage equalization effect.
To solve contradiction of the intermodule sequence Pressure and Control above using different indexs, the present invention is based on module synthesis voltage
Index, the integrated voltage index with input submodule number positive and negative and module in capacitance voltage and with module electric capacity electricity
Pressure difference is relevant.Conventional sequence Pressure and Control are carried out using the index, coordinates voltage difference in the module of whole bridge arm consistent, can be same
When ensure that the balanced capacitance voltage and between disparate modules of inside modules two capacitance voltages is balanced.
When input submodule number is timing, integrated voltage index be in module capacitance voltage and with capacitance voltage in module
Poor weighted sum.This be because bridge arm current is for just, in the module of input capacitance voltage and it is poor with capacitance voltage in module simultaneously
Increase, otherwise reduce simultaneously.
When put into submodule number for it is negative when, integrated voltage index be in module capacitance voltage and with capacitance voltage in module
Poor weighted difference.This is capacitance voltage and reduction in the module of input because bridge arm current is for just, and voltage difference increases, otherwise
Capacitance voltage and increase in module, voltage difference reduce.
Finally according to bridge arm current direction and the positive and negative state of input submodule number, with reference to different voltages obtained above
The submodule number of output state, different electricity are matched to integrated voltage index highest, centre, minimum submodule after sequence respectively
Pressure output state.Specifically：
When input submodule number is for just, bridge arm current direction is timing, is ranked up by integrated voltage index, and voltage is minimum
Submodule output single capacitor voltage, the excision of voltage highest submodule, the double capacitance voltages of other submodules output.
When input submodule number is for just, bridge arm current direction is when bearing, to be ranked up by integrated voltage index, voltage highest
Submodule output single capacitor voltage, the minimum submodule excision of voltage, the double capacitance voltages of other submodules output.
When input submodule number is negative, bridge arm current direction is timing, is ranked up by integrated voltage index, voltage highest
The negative input of submodule, the excision of other submodules.
When input submodule number is negative, when bridge arm current direction is to bear, it is ranked up by integrated voltage index, voltage is minimum
The negative input of submodule, the excision of other submodules.
Above-mentioned each state subgroup number of modules is determined by following scheme：
It is assumed that single bridge arm contains N number of submodule, each submodule includes totally 2 subelements.Can determine according to following proposal
Specific excision and output number, but the program be not it is unique, can be according to being actually changed and adjust.
When input submodule number is for just, modulating wave need to export M subelement, bridge arm current direction is timing, comprehensive electricity
The minimum N of pressure index1Individual submodule exports single capacitor voltage, voltage highest N2Individual submodule excision, other submodules output is double
Capacitance voltage；When bridge arm current direction is to bear, by the N that integrated voltage index is minimum3Individual submodule excision, voltage highest N4It is individual
Submodule exports single capacitor voltage, the double capacitance voltages of other submodules output.
If single capacitor voltage output submodule number tries one's best few in bridge arm, single capacitor voltage output submodule number is
M%2 (M divided by 2 remainder), double capacitance voltage output sub-module numbers are M/2, the excision of other submodules；If single electricity in bridge arm
When appearance voltage output submodule number tries one's best many, if M >=N, single capacitor voltage output submodule number is 2N-M, double electric capacity electricity
Pressure output sub-module number is M-N；If M<N, then single capacitor voltage output submodule number is M, and double capacitance voltages export submodule
Block number is 0, the excision of other submodules.I.e.：
If the summation of capacitance voltage difference is for just in module, when bridge arm current direction is timing, then N1=M%2, N2=N-N1–
M/2；When bridge arm current direction is to bear, if M >=N, N4=2N-M, N3=0；If M<N, then N4=M, N3=N-M；
If the summation of capacitance voltage difference be negative in module, when bridge arm current direction is timing, then N4=M%2, N3=N-N4–
M/2；When bridge arm current direction is to bear, if M >=N, N1=2N-M, N2=0；If M<N, then N1=M, N2=N-M；Wherein, %
Expression takes the remainder operation.
When input submodule number is negative, when modulating wave needs-M subelement of output, submodule (the output negative electricity of input is born
Pressure) submodule number be M, the submodule number of excision is N-M.
By taking 10 mixing Shuangzi modules of single bridge arm as an example, when modulating wave needs 8 subelements of output, if single bridge arm module
When the summation of interior voltage difference is identical with bridge arm current symbol, the submodule of single capacitor voltage output is reduced as far as possible, can now set
4 double capacitance voltage output sub-modules are put, single capacitor voltage output submodule is not provided with.When modulating wave needs 15 sons of output single
When first, if the summation of voltage difference is opposite with bridge arm current symbol in single bridge arm module, single capacitor voltage output is increased as far as possible
Submodule, now can be set 5 double capacitance voltage output sub-modules, set 5 single capacitor voltage output submodules.
By taking 10 mixing Shuangzi modules of single bridge arm as an example, regardless of the sense of current, if modulating wave needs to export -3 sons
During unit, then 3 submodules of input are born, cut off 7 submodules.
In addition, the present invention also provides a kind of mixing Shuangzi module MMC voltage-stabilizing controllers, for any one bridge arm, including
For according to the summation of voltage difference positive and negative in bridge arm current direction, the module of whole bridge arm and input submodule number just
Negative, the integrated voltage index to each submodule is ranked up, and determines the module of the corresponding output state of each submodule；It is described comprehensive
Close voltage indexes and capacitance voltage in module and poor with capacitance voltage in module relevant.
The device is actually based on a kind of computer solution of the inventive method flow, i.e., a kind of software architecture,
Above-mentioned module is each treatment progress or the program corresponding with method flow.Because the introduction to the above method is clear enough
Chu is complete, therefore the device is no longer described in detail.
Claims (8)
1. it is a kind of to mix Shuangzi module MMC pressure equalizing control methods, it is characterised in that for any one bridge arm, according to bridge arm current
The summation of voltage difference is positive and negative and input submodule number positive and negative in direction, the module of whole bridge arm, to each submodule
Integrated voltage index is ranked up, and determines the corresponding output state of each submodule；The integrated voltage index and electric capacity in module
Voltage is poor relevant with capacitance voltage in, module.
2. it is according to claim 1 to mix Shuangzi module MMC pressure equalizing control methods, it is characterised in that when input submodule
Number is timing, and integrated voltage index is capacitance voltage and the weighted sum poor with capacitance voltage in module in module；When input
When number of modules is to bear, integrated voltage index is capacitance voltage and the weighted difference poor with capacitance voltage in module in module.
3. it is according to claim 2 to mix Shuangzi module MMC pressure equalizing control methods, it is characterised in that a bridge arm includes N
Individual submodule, each submodule includes 2 subelements；
When input submodule number is for just, when modulating wave need to export M subelement, submodule output state includes single capacitor electricity
Pressure, double capacitance voltages and excision：
Bridge arm current direction is timing, by the N that integrated voltage index is minimum1Individual submodule exports single capacitor voltage, voltage highest
N2Individual submodule excision, the double capacitance voltages of other submodules output；
When bridge arm current direction is to bear, by the N that integrated voltage index is minimum3Individual submodule excision, voltage highest N4Individual submodule
Output single capacitor voltage, the double capacitance voltages of other submodules output；
When submodule number is put into bear, when modulating wave needs-M subelement of output, submodule output state includes negative sense electricity
Hold voltage and excision：
Bridge arm current direction is timing, by M submodule output negative sense capacitance voltage of integrated voltage index highest, other submodules
Block cuts off；
When bridge arm current direction is to bear, M minimum submodule of integrated voltage index is exported into negative sense capacitance voltage, other submodules
Block cuts off；
Wherein, N, M, N1、N2、N3And N4It is natural number.
4. it is according to claim 3 to mix Shuangzi module MMC pressure equalizing control methods, it is characterised in that if electric capacity in module
The summation of voltage difference for just, then N1=M%2, N2=N-N1–M/2；If M >=N, N4=2N-M, N3=0；If M<N, then N4=M,
N3=N-M；
If the summation of capacitance voltage difference is negative, N in module4=M%2, N3=N-N4–M/2；If M >=N, N1=2N-M, N2=
0；If M<N, then N1=M, N2=N-M；Wherein, % is represented and is taken the remainder operation.
5. it is a kind of to mix Shuangzi module MMC voltage-stabilizing controllers, it is characterised in that for any one bridge arm, including for basis
The summation of voltage difference is positive and negative and input submodule number positive and negative in bridge arm current direction, the module of whole bridge arm, to each
The integrated voltage index of submodule is ranked up, and determines the module of the corresponding output state of each submodule；The integrated voltage refers to
Mark and capacitance voltage in module and, capacitance voltage is poor relevant in module.
6. it is according to claim 5 to mix Shuangzi module MMC voltage-stabilizing controllers, it is characterised in that when input submodule
Number is timing, and integrated voltage index is capacitance voltage and the weighted sum poor with capacitance voltage in module in module；When input
When number of modules is to bear, integrated voltage index is capacitance voltage and the weighted difference poor with capacitance voltage in module in module.
7. it is according to claim 6 to mix Shuangzi module MMC voltage-stabilizing controllers, it is characterised in that a bridge arm includes N
Individual submodule, each submodule includes 2 subelements：
When input submodule number is for just, when modulating wave need to export M subelement, submodule output state includes single capacitor electricity
Pressure, double capacitance voltages and excision：
Bridge arm current direction is timing, by the N that integrated voltage index is minimum1Individual submodule exports single capacitor voltage, voltage highest
N2Individual submodule excision, the double capacitance voltages of other submodules output；
When bridge arm current direction is to bear, by the N that integrated voltage index is minimum3Individual submodule excision, voltage highest N4Individual submodule
Output single capacitor voltage, the double capacitance voltages of other submodules output；
When submodule number is put into bear, when modulating wave needs-M subelement of output, submodule output state includes negative sense electricity
Hold voltage and excision：
Bridge arm current direction is timing, by M submodule output negative sense capacitance voltage of integrated voltage index highest, other submodules
Block cuts off；
When bridge arm current direction is to bear, M minimum submodule of integrated voltage index is exported into negative sense capacitance voltage, other submodules
Block cuts off；
Wherein, N, M, N1、N2、N3And N4It is natural number.
8. it is according to claim 7 to mix Shuangzi module MMC voltage-stabilizing controllers, it is characterised in that if electric capacity in module
The summation of voltage difference for just, then N1=M%2, N2=N-N1–M/2；If M >=N, N4=2N-M, N3=0；If M<N, then N4=M,
N3=N-M；
If the summation of capacitance voltage difference is negative, N in module4=M%2, N3=N-N4–M/2；If M >=N, N1=2N-M, N2=
0；If M<N, then N1=M, N2=N-M；Wherein, % is represented and is taken the remainder operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710063388.3A CN106849696B (en) | 2017-02-03 | 2017-02-03 | A kind of mixing Shuangzi module MMC pressure equalizing control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710063388.3A CN106849696B (en) | 2017-02-03 | 2017-02-03 | A kind of mixing Shuangzi module MMC pressure equalizing control method and device |
Publications (2)
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| CN109687477A (en) * | 2019-02-20 | 2019-04-26 | 山东大学 | Applied to the basic unit of chain type STATCOM, chain type STATCOM and method |
| CN109787497A (en) * | 2019-03-11 | 2019-05-21 | 中国矿业大学 | A kind of ovennodulation method for equalizing voltage of mixed type MMC |
| CN111092561A (en) * | 2019-12-27 | 2020-05-01 | 东南大学 | Sub-module capacitor voltage fast recovery method after unlocking of mixed MMC |
| CN116131641A (en) * | 2023-02-23 | 2023-05-16 | 天津大学 | Control method for hybrid modular multilevel converter under direct current distribution network |
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| CN111092561A (en) * | 2019-12-27 | 2020-05-01 | 东南大学 | Sub-module capacitor voltage fast recovery method after unlocking of mixed MMC |
| CN116131641A (en) * | 2023-02-23 | 2023-05-16 | 天津大学 | Control method for hybrid modular multilevel converter under direct current distribution network |
| CN116131641B (en) * | 2023-02-23 | 2024-02-13 | 天津大学 | Control method for hybrid modular multilevel converter under direct current distribution network |
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