CN108959756A - A kind of linear pressure sequence method and device - Google Patents
A kind of linear pressure sequence method and device Download PDFInfo
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- CN108959756A CN108959756A CN201810681930.6A CN201810681930A CN108959756A CN 108959756 A CN108959756 A CN 108959756A CN 201810681930 A CN201810681930 A CN 201810681930A CN 108959756 A CN108959756 A CN 108959756A
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Abstract
The present invention provides a kind of linear pressure sequence method and devices, the capacitance voltage of full-bridge submodule in bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration is unified according to two adjacent step sizes to the combination of two of the switching state of the full-bridge submodule in bridge arm, it is divided into A, B, C, tetra- groups of D, any group of in the middle with the progress of charge and discharge, although the increment of capacitance voltage is different, but in the capacitance voltage group that last step-length is ascending order, ascending order can be still maintained after the update of overvoltage, therefore, it can be obtained the ascending sort of the capacitance voltage of N number of full-bridge submodule in a bridge arm only by 2N-3 comparison, the computation complexity for solving existing sort algorithm is high, and it is analyzed and is combined without the modeling process for inverter, it is caused to be unable to reach based on trapezoidal integration Tradition wears the technical issues of Vernam model optimal simulation efficiency.
Description
Technical field
The present invention relates to flexible DC transmission technology field more particularly to a kind of linear pressure sequence method and devices.
Background technique
Modularization multi-level converter (Modular Multilevel Converter, MMC) is low by its switching loss,
The advantages that output waveform harmonic content is few, has been widely used in flexible DC transmission engineering field, currently, building both at home and abroad
Flexible DC transmission engineering mostly use MMC structure.
As MMC level number is continuously increased, the admittance matrix order of non-linear inverter model will be also continuously increased, this will
So that the calculation amount inverted in MMC electromagnetic transient simulation to the admittance matrix of non-linear inverter model is very big, lead to high level
Number MMC electromagnetic transient simulation speed is extremely slow, is unable to satisfy scientific research demand.For this purpose, the Gole of Canadian the university of manitoba
Academician research team proposes a kind of MMC equivalent model based on trapezoidal integration, by can be changed switching device with a diadic
Resistance replacement and shutdown resistance are an actual value, while using trapezoidal integration discretization submodule capacitor, and find out single bridge
The thevenin equivalent circuit of arm has been started MMC high-precision and has been ground with the modeling that high efficiency is laid equal stress on to realize the depression of order of admittance matrix
Study carefully frontier.
But the modeling method of the existing MMC equivalent model based on trapezoidal integration is not bound with the modeling process of inverter
And the basic principle of trapezoidal integration is improved for equal pressure sequence algorithm, in emulation by a large amount of superelevation Level Full Bridge types
When the multiterminal element power grid that MMC is constituted, computational efficiency is low.And with the development of DC grid, quickly cut off direct fault current
Become critical problem, is one for cutting off DC Line Fault currently based on being passed through without locking DC Line Fault for bridge-type MMC
The solution of mainstream, therefore effect of the full-bridge in research work is increasingly prominent, it is necessary to analysis is based on trapezoidal integration
The linear ordering algorithm of bridge-type MMC tradition Dai Weinan equivalent model.
MMC submodule capacitor voltage sort algorithm mainly has the side such as bubbling method, prime factorization method, Shell sort at present
Method, above-mentioned equal pressure sequence algorithm, computation complexity are mostly O (N2).Wherein Shell sorting algorithm equalizing effect and bubbling method are tight
Lattice are equivalent, and average time complexity is O (Nlog2N), still remain improved space.Though based on amendment optimization merger sequence
Right time complexity can be reduced to linearly, but equalizing effect can not accomplish strictly equivalent with bubbling method, and consistency is less than bubbling method.
And above sort algorithm is analyzed and is combined without the modeling process for inverter, therefore is unable to reach based on trapezoidal
The tradition of integration method wears the optimal simulation efficiency of Vernam model.
Summary of the invention
The present invention provides a kind of linear pressure sequence method and device, the calculating for solving existing sort algorithm is complicated
Degree is high, and is analyzed and combined without the modeling process for inverter, caused to be unable to reach based on trapezoidal integration
Tradition wears the technical issues of Vernam model optimal simulation efficiency.
The present invention provides a kind of linear pressure sort methods, comprising:
S1, according to two moment of t and t- △ T based on complete in the bridge-type MMC Dai Weinan equivalent model of trapezoidal integration
The investment or excision state of bridge submodule, are divided into tetra- groups of A, B, C, D for full-bridge submodule in a bridge arm, wherein enable A group in t
Moment investment, t- △ T moment put into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut off in t moment, the t- △ T moment
Investment, D group are cut off in t moment, and the t- △ T moment cuts off, and obtain the of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D
The arrangement of one ascending order；
S2, the update in a step-length is completed to the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D respectively, obtains
A, the second ascending order arrangement of the capacitance voltage of the full-bridge submodule in tetra- groups of B, C, D；
S3, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of A, B, to complete in two groups of A, B
The capacitance voltage of bridge submodule carries out ascending sort, obtains the third ascending order arrangement of the capacitance voltage of the full-bridge submodule of E group；
S4, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of C, D, to complete in two groups of C, D
The capacitance voltage of bridge submodule carries out ascending sort, obtains the 4th ascending order arrangement of the capacitance voltage of the full-bridge submodule of F group；
S5, the capacitor according to the full-bridge submodule of the third ascending order arrangement and F group of the capacitance voltage of the full-bridge submodule of E group
4th ascending order of voltage arranges, and carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of E, F, obtains based on trapezoidal
5th ascending sort of the capacitance voltage of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model of integration method.
Optionally, step S3 carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups into S5 specifically:
S00, initialization first count symbol PON=1 and second counts symbol POFF=1；
S01, serial number first in the ascending order arrangement of the capacitance voltage of the full-bridge submodule in first group is counted into symbol
Serial number second counts the second of symbol in the ascending order arrangement of the capacitance voltage of full-bridge submodule in first element, with second group
Element carries out size comparison, lesser element is moved in new ascending order arrangement；
S02, after the corresponding counting symbol of biggish element is added one, return step S01, which is re-started, to be compared.
Optionally, the investment shape of the full-bridge submodule in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
State includes positive investment state and negative investment state.
The present invention provides a kind of linear pressure collators, comprising:
Grouped element, it is equivalent for the bridge-type MMC Dai Weinan according to two moment of t and t- △ T based on trapezoidal integration
The investment or excision state of full-bridge submodule in model, are divided into tetra- groups of A, B, C, D for full-bridge submodule in a bridge arm,
In, enable A group put into t moment, the t- △ T moment puts into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut in t moment
It removes, the t- △ T moment puts into, and D group is cut off in t moment, and the t- △ T moment cuts off, and obtains the full-bridge submodule in tetra- groups of A, B, C, D
First ascending order of capacitance voltage arranges；
Updating unit is completed in a step-length for the capacitance voltage respectively to the full-bridge submodule in tetra- groups of A, B, C, D
Update, obtain the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D the second ascending order arrangement；
First comparing unit, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of A, B arranges, right
A, the capacitance voltage of the full-bridge submodule in two groups of B carries out ascending sort, obtains the of the capacitance voltage of the full-bridge submodule of E group
The arrangement of three ascending orders；
Second comparing unit, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of C, D arranges, right
C, the capacitance voltage of the full-bridge submodule in two groups of D carries out ascending sort, obtains the of the capacitance voltage of the full-bridge submodule of F group
The arrangement of four ascending orders；
Third comparing unit, for according to the complete of the third ascending order arrangement of the capacitance voltage of the full-bridge submodule of E group and F group
4th ascending order of the capacitance voltage of bridge submodule arranges, and carries out ascending order row to the capacitance voltage of the full-bridge submodule in two groups of E, F
Sequence obtains the capacitance voltage of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
5th ascending sort.
Optionally, include: in the first comparing unit, the second comparing unit and third comparing unit
Subelement is initialized, counts symbol P for initializing firstON=1 and second counts symbol POFF=1；
Comparing subunit, for serial number first in the ascending order arrangement by the capacitance voltage of the full-bridge submodule in first group
Serial number second counts in the ascending order arrangement of the capacitance voltage of full-bridge submodule in the first element for counting symbol, with second group
The second element of symbol carries out size comparison, lesser element is moved in new ascending order arrangement；
Iteration subelement jumps to comparing subunit again after the corresponding counting symbol of biggish element is added one
It is compared.
Optionally, the investment shape of the full-bridge submodule in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
State includes positive investment state and negative investment state.
As can be seen from the above technical solutions, the invention has the following advantages that
Linear press sort method the present invention provides a kind of, comprising: S1, be based on according to two moment of t and t- △ T it is trapezoidal
The investment or excision state of full-bridge submodule in the bridge-type MMC Dai Weinan equivalent model of integration method, will be complete in a bridge arm
Bridge submodule is divided into tetra- groups of A, B, C, D, wherein enables A group put into t moment, the t- △ T moment puts into, and B group is put into t moment, t-
The △ T moment cuts off, and C group is cut off in t moment, and the t- △ T moment put into, and D group is cut off at t moment excision, t- △ T moment, obtain A,
B, the first ascending order arrangement of the capacitance voltage of the full-bridge submodule in tetra- groups of C, D；S2, respectively to the full-bridge in tetra- groups of A, B, C, D
The capacitance voltage of submodule completes the update in a step-length, obtains the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D
The second ascending order arrangement；S3, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of A, B, to two groups of A, B
The capacitance voltage of interior full-bridge submodule carries out ascending sort, obtains the third ascending order of the capacitance voltage of the full-bridge submodule of E group
Arrangement；S4, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of C, D, to full-bridge in two groups of C, D
The capacitance voltage of module carries out ascending sort, obtains the 4th ascending order arrangement of the capacitance voltage of the full-bridge submodule of F group；S5, root
According to the 4th liter of the capacitance voltage of the full-bridge submodule of the third ascending order arrangement and F group of the capacitance voltage of the full-bridge submodule of E group
Sequence arrangement carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of E, F, obtains the full-bridge based on trapezoidal integration
5th ascending sort of the capacitance voltage of all full-bridge submodules in type MMC Dai Weinan equivalent model.
In the present invention, by the electricity of the full-bridge submodule in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
Hold the combination of two that voltage unifies the switching state of the full-bridge submodule in bridge arm according to two adjacent step sizes, is divided into A, B, C, D
Four groups, any group of in the middle with the progress of charge and discharge, although the increment of capacitance voltage is different, in last step-length
For the capacitance voltage group of ascending order, ascending order can be still maintained after the update of overvoltage, therefore, be only by 2N-3 comparison
The ascending sort that can get the capacitance voltage of N number of full-bridge submodule in a bridge arm, solves the meter of existing sort algorithm
Complexity height is calculated, and is analyzed and is combined without the modeling process for inverter, it is caused to be unable to reach based on trapezoidal product
The tradition of point-score wears the technical issues of Vernam model optimal simulation efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of linear one embodiment for pressing sort method provided by the invention；
Fig. 2 is a kind of structural schematic diagram of linear one embodiment for pressing collator provided by the invention；
Fig. 3 is provided by the invention a kind of linear to press the first comparing unit in collator, the second comparing unit and the
The common structure schematic diagram of three comparing units；
Fig. 4 is the circuit diagram of full-bridge submodule；
Fig. 5 is the concomitant circuit schematic diagram of full-bridge submodule；
Fig. 6 is concomitant circuit schematic diagram after voltage source zero setting；
Fig. 7 is concomitant circuit schematic diagram after current source zero setting；
Fig. 8 is the schematic diagram of linear sort method in the present invention.
Specific embodiment
The embodiment of the invention provides a kind of linear pressure sequence method and devices, solve the meter of existing sort algorithm
Complexity height is calculated, and is analyzed and is combined without the modeling process for inverter, it is caused to be unable to reach based on trapezoidal product
The tradition of point-score wears the technical issues of Vernam model optimal simulation efficiency.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of linear one embodiment for pressing sort method provided by the invention, comprising:
101, according to two moment of t and t- △ T based on complete in the bridge-type MMC Dai Weinan equivalent model of trapezoidal integration
The investment or excision state of bridge submodule, are divided into tetra- groups of A, B, C, D for full-bridge submodule in a bridge arm, wherein enable A group in t
Moment investment, t- △ T moment put into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut off in t moment, the t- △ T moment
Investment, D group are cut off in t moment, and the t- △ T moment cuts off, and obtain the of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D
The arrangement of one ascending order；
102, the update in a step-length is completed to the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D respectively, obtains
Second ascending order of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D arranges；
It should be noted that seeking submodule capacitance current I first with superposition theoremC(t) expression formula.Fig. 4 and Fig. 5 are
The circuit diagram of full-bridge submodule and its concomitant circuit, submodule access bridge arm are equivalent to one electric current of access at port
Source, Fig. 6 are the circuit after star triangular transformation will to be carried out again after the concomitant circuit voltage source zero setting of full-bridge submodule, then can be in the hope of
Then flow through the electric current of capacitor are as follows:
Wherein:
Fig. 7 is that can acquire the circuit after full-bridge submodule concomitant circuit current source zero setting:
The then expression formula of submodule capacitance current are as follows:
According to trapezoidal integration:
If expecting VC (t) and VCThe relationship of (t- Δ T), then should first find out VC(t) and IC(t) relationship, from formula (7) and
(8) start with, eliminate VCEQ(t-△T).The first row of (8), which is substituted into (7), to be obtained:
It arranges:
In (10),
R1+R2=RM (11)
R3+R4=RN (12)
R1+R2+R3+R4=RQ (13)
R when being operated normally known to the operating status of full-bridgeM、RN、RQValue be constant.It is available from formula (10)
IC(t- Δ T) eliminates V then in conjunction with formula (10) and (8)CEQ(t- △ T) and IC(t- Δ T), then can be obtained VC(t) and VC(t-Δ
T relationship):
Wherein R ' i (i=1,2,3,4) is the equivalent resistance of the switching device of last moment.Assuming that M and N number of submodule
Block is (belonging to same group) all the same in two moment on states of t and t- △ T, then the two submodules are corresponding two moment
Switching device equivalent resistance it is all the same.It can thus be concluded that in M and N number of submodule: R1M=R1N, R2M=R2N, R3M=
R3N, R4M=R4N, R '1M=R '1N, R '2M=R '2N, R '3M=R '3N, R '4M=R '4N.The capacitance voltage of two submodule of M, N is carried out
Making the difference can obtain:
In (15), RP> > RC, RP-RC≈RP, then RMRNRP-RMRNRC≈RMRNRP, and RMRNRPThe order of magnitude be much higher than
RPRQRCThe order of magnitude, therefore (RMRNRP-RMRNRC-RPRQRC) > 0, if setting VCM(t-ΔT)≥VCN(t- Δ T), then by formula
(15) V can be obtainedCM(t)-VCN(t) >=0 permanent to set up, to demonstrate the full-bridge submodule capacitor electricity in same group in ascending order arrangement
It is pressed in a simulation step length after completing to update, is still ascending order arrangement.
103, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of A, B, to complete in two groups of A, B
The capacitance voltage of bridge submodule carries out ascending sort, obtains the third ascending order arrangement of the capacitance voltage of the full-bridge submodule of E group；
104, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of C, D, to complete in two groups of C, D
The capacitance voltage of bridge submodule carries out ascending sort, obtains the 4th ascending order arrangement of the capacitance voltage of the full-bridge submodule of F group；
105, according to the electricity of the arrangement of the third ascending order of the capacitance voltage of the full-bridge submodule of E group and the full-bridge submodule of F group
The 4th ascending order arrangement for holding voltage carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of E, F, obtains based on ladder
5th ascending sort of the capacitance voltage of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model of shape integration method；
Wherein, step 103 carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups in 105 specifically:
001, initialization first counts symbol PON=1 and second counts symbol POFF=1；
002, serial number first in the ascending order arrangement of the capacitance voltage of the full-bridge submodule in first group is counted into symbol
Serial number second counts the second of symbol in the ascending order arrangement of the capacitance voltage of full-bridge submodule in first element, with second group
Element carries out size comparison, lesser element is moved in new ascending order arrangement；
003, after the corresponding counting symbol of biggish element being added one, return step 002, which re-starts, to be compared；
It should be noted that by taking two groups of A, B as an example, it is assumed that two groups of ascending orders of A, B arrangement submodule capacitor voltage be respectively
{a1,a2,...,aM, { b1,b2,...,bK, now introduce two counting symbol PONAnd POFF.In the initial time of sequence, PON=
1, POFF=1.1st element a in A group1With first element b in B group1It is compared.If b1< a1, then b1It is moved to " voltage
First element position in sequence list ", while PON=1, POFF=2, it means that next time relatively in, a1Will and b2Compare,
Vice versa.Finally obtained capacitance voltage ascending order list is E group.
In the embodiment of the present invention, by the full-bridge submodule in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
The capacitance voltage of block unifies the combination of two of the switching state of the full-bridge submodule in bridge arm according to two adjacent step sizes, be divided into A,
B, tetra- groups of C, D, any group of in the middle with the progress of charge and discharge, although the increment of capacitance voltage is different, upper
A step-length is the capacitance voltage group of ascending order, ascending order can be still maintained after the update of overvoltage, therefore, only by 2N-3 times
Compare the ascending sort that can be obtained the capacitance voltage of N number of full-bridge submodule in a bridge arm, solves existing sequence and calculate
The computation complexity of method is high, and is analyzed and combined without the modeling process for inverter, and caused be unable to reach is based on
The tradition of trapezoidal integration wears the technical issues of Vernam model optimal simulation efficiency.
It is below will to a kind of explanation that linear one embodiment for pressing sort method carries out provided by the invention above
A kind of linear one embodiment of collator is pressed to be illustrated to provided by the invention.
Referring to Fig. 2, the present invention provides a kind of linear one embodiment for pressing collator, comprising:
Grouped element 201, for the bridge-type MMC Dai Weinan etc. according to two moment of t and t- △ T based on trapezoidal integration
The investment or excision state for imitating the full-bridge submodule in model, are divided into tetra- groups of A, B, C, D for full-bridge submodule in a bridge arm,
In, enable A group put into t moment, the t- △ T moment puts into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut in t moment
It removes, the t- △ T moment puts into, and D group is cut off in t moment, and the t- △ T moment cuts off, and obtains the full-bridge submodule in tetra- groups of A, B, C, D
First ascending order of capacitance voltage arranges；
Updating unit 202 completes a step-length for the capacitance voltage respectively to the full-bridge submodule in tetra- groups of A, B, C, D
Interior update obtains the second ascending order arrangement of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D；
First comparing unit 203, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of A, B are arranged
Column carry out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of A, B, obtain the capacitor electricity of the full-bridge submodule of E group
The third ascending order of pressure arranges；
Second comparing unit 204, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of C, D are arranged
Column carry out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of C, D, obtain the capacitor electricity of the full-bridge submodule of F group
The 4th ascending order arrangement of pressure；
Third comparing unit 205, for the arrangement of third ascending order and F group according to the capacitance voltage of the full-bridge submodule of E group
Full-bridge submodule capacitance voltage the 4th ascending order arrangement, the capacitance voltage of the full-bridge submodule in two groups of E, F is risen
Sequence sequence obtains the capacitor electricity of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
5th ascending sort of pressure；
Include: in first comparing unit 203, the second comparing unit 204 and third comparing unit 205
Subelement 301 is initialized, counts symbol P for initializing firstON=1 and second counts symbol POFF=1；
Comparing subunit 302, for serial number in the ascending order arrangement by the capacitance voltage of the full-bridge submodule in first group
Serial number second in the ascending order arrangement of the capacitance voltage of full-bridge submodule in first element of the first counting symbol, with second group
The second element for counting symbol carries out size comparison, lesser element is moved in new ascending order arrangement；
Iteration subelement 303 jumps to comparing subunit weight after the corresponding counting symbol of biggish element is added one
Newly it is compared.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of linear pressure sort method characterized by comprising
S1, according to two moment of t and t- △ T based in the bridge-type MMC Dai Weinan equivalent model of trapezoidal integration full-bridge
The investment or excision state of module, are divided into tetra- groups of A, B, C, D for full-bridge submodule in a bridge arm, wherein enable A group in t moment
Investment, t- △ T moment put into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut off in t moment, and the t- △ T moment puts into,
D group is cut off in t moment, and the t- △ T moment cuts off, and obtains first liter of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D
Sequence arrangement；
S2, the update in a step-length is completed to the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D respectively, obtain A, B,
C, the second ascending order arrangement of the capacitance voltage of the full-bridge submodule in tetra- groups of D；
S3, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of A, B, to full-bridge in two groups of A, B
The capacitance voltage of module carries out ascending sort, obtains the third ascending order arrangement of the capacitance voltage of the full-bridge submodule of E group；
S4, it is arranged according to the second ascending order of the capacitance voltage of the full-bridge submodule in two groups of C, D, to full-bridge in two groups of C, D
The capacitance voltage of module carries out ascending sort, obtains the 4th ascending order arrangement of the capacitance voltage of the full-bridge submodule of F group；
S5, the capacitance voltage according to the full-bridge submodule of the third ascending order arrangement and F group of the capacitance voltage of the full-bridge submodule of E group
The arrangement of the 4th ascending order, ascending sort is carried out to the capacitance voltage of the full-bridge submodule in two groups of E, F, is obtained based on trapezoidal integration
5th ascending sort of the capacitance voltage of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model of method.
2. linear pressure sort method according to claim 1, which is characterized in that step S3 is into S5, in two groups
The capacitance voltage of full-bridge submodule carries out ascending sort specifically:
S00, initialization first count symbol PON=1 and second counts symbol POFF=1；
S01, serial number first in the ascending order arrangement of the capacitance voltage of the full-bridge submodule in first group is counted the first of symbol
Serial number second counts the second element of symbol in the ascending order arrangement of the capacitance voltage of full-bridge submodule in element, with second group
Size comparison is carried out, lesser element is moved in new ascending order arrangement；
S02, after the corresponding counting symbol of biggish element is added one, return step S01, which is re-started, to be compared.
3. linear pressure sort method according to claim 1, which is characterized in that the bridge-type based on trapezoidal integration
The investment state of full-bridge submodule in MMC Dai Weinan equivalent model includes positive investment state and negative investment state.
4. a kind of linear pressure collator characterized by comprising
Grouped element, for the bridge-type MMC Dai Weinan equivalent model according to two moment of t and t- △ T based on trapezoidal integration
In full-bridge submodule investment or excision state, full-bridge submodule in a bridge arm is divided into tetra- groups of A, B, C, D, wherein enable A
Group is put into t moment, and the t- △ T moment puts into, and B group is put into t moment, and the t- △ T moment cuts off, and C group is cut off in t moment, t- △ T
Moment investment, D group are cut off in t moment, and the t- △ T moment cuts off, and obtain the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D
The first ascending order arrangement；
Updating unit is completed in a step-length more for the capacitance voltage respectively to the full-bridge submodule in tetra- groups of A, B, C, D
Newly, the second ascending order arrangement of the capacitance voltage of the full-bridge submodule in tetra- groups of A, B, C, D is obtained；
First comparing unit, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of A, B arranges, to A, B
The capacitance voltage of full-bridge submodule in two groups carries out ascending sort, obtains the third of the capacitance voltage of the full-bridge submodule of E group
Ascending order arrangement；
Second comparing unit, the second ascending order for the capacitance voltage according to the full-bridge submodule in two groups of C, D arranges, to C, D
The capacitance voltage of full-bridge submodule in two groups carries out ascending sort, obtains the 4th of the capacitance voltage of the full-bridge submodule of F group
Ascending order arrangement；
Third comparing unit, for sub according to the third ascending order arrangement of the capacitance voltage of the full-bridge submodule of E group and the full-bridge of F group
4th ascending order of the capacitance voltage of module arranges, and carries out ascending sort to the capacitance voltage of the full-bridge submodule in two groups of E, F, obtains
To the 5th liter of the capacitance voltage of all full-bridge submodules in the bridge-type MMC Dai Weinan equivalent model based on trapezoidal integration
Sequence sequence.
5. linear pressure collator according to claim 4, which is characterized in that the relatively list of the first comparing unit, second
Include: in member and third comparing unit
Subelement is initialized, counts symbol P for initializing firstON=1 and second counts symbol POFF=1；
Comparing subunit is counted for serial number first in the ascending order arrangement by the capacitance voltage of the full-bridge submodule in first group
Serial number second counts symbol in the ascending order arrangement of the capacitance voltage of full-bridge submodule in first element of symbol, with second group
Second element carry out size comparison, lesser element is moved in new ascending order arrangement；
Iteration subelement jumps to comparing subunit and re-starts after the corresponding counting symbol of biggish element is added one
Compare.
6. linear pressure collator according to claim 4, which is characterized in that the bridge-type based on trapezoidal integration
The investment state of full-bridge submodule in MMC Dai Weinan equivalent model includes positive investment state and negative investment state.
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