CN109193743A - A kind of balance of voltage method and voltage balancing device - Google Patents
A kind of balance of voltage method and voltage balancing device Download PDFInfo
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- CN109193743A CN109193743A CN201811176867.7A CN201811176867A CN109193743A CN 109193743 A CN109193743 A CN 109193743A CN 201811176867 A CN201811176867 A CN 201811176867A CN 109193743 A CN109193743 A CN 109193743A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present embodiments relate to transmission & distribution electro-technical field, a kind of balance of voltage method and voltage balancing device are disclosed.The balance of voltage method is applied to inverter, comprising: obtains the modulating wave of the single bridge arm of inverter；The investment submodule total number of single bridge arm is calculated according to modulating wave and system parameter；Determine the quantity for putting into the submodule of single bridge arm in each default submodule grouping respectively；Wherein, each default submodule grouping puts into the sum of submodule quantity of single bridge arm equal to investment submodule total number；Obtain the current direction of single bridge arm；The state of each submodule in the submodule of single bridge arm is put into according to current direction control；Wherein, the state of submodule includes charged state and discharge condition.In the present invention, so that the number of the submodule of investment is directly arranged when carrying out single bridge arm and being press-fitted and set from the grouping of default submodule for inverter, the Pressure and Control burden of inverter is reduced, and improve the Pressure and Control efficiency of single bridge arm.
Description
Technical field
The present embodiments relate to transmission & distribution electro-technical field, in particular to a kind of balance of voltage method and balance of voltage dress
It sets.
Background technique
Voltage source converter type DC transmission system (Voltage Source Converter based High
Voltage Direct Current Transmission, referred to as " VSC-HVDC ") it is one kind with turn-off device and pulsewidth tune
New HVDC transmission technology based on system (Pulse Width Modulation, referred to as " PWM ") technology.This transmission of electricity
Technology body portion needs a large amount of lower pressure subsidiary block coupled in series to form, and an important link is submodule electric voltage equalization control
System is easy to appear over-voltage and over-current situation, or even over-voltage breakdown situation can occur, causes if the control of submodule voltage is unstable
Transmission system is promptly latched.
However, it is found by the inventors that at least there are the following problems in the prior art: in VSC-HVDC Neutron module electric voltage equalization
Control method is that FPGA (Field-Programmable Gate Array, field-programmable door column are arranged in valve control device
Battle array) it needs when being determined the voltage of bridge arm entire in inverter to carry out entirety sequence to whole submodules, then basis
The voltage swing and current direction of each submodule are ranked up, so that the voltage value of each submodule is in default range,
This voltage balancing method needs to occupy a large amount of FPGA resource and a large amount of calculating cycle of consumption, has aggravated the negative of valve control device
Switching frequency is carried on a shoulder pole and increased, causes submodule equalizing effect bad.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of balance of voltage method and voltage balancing device, so that inverter
The number of the submodule of investment is directly set from the grouping of default submodule when carrying out single bridge arm and being press-fitted and set, reduces and changes
The Pressure and Control burden of device is flowed, and improves the Pressure and Control efficiency of single bridge arm.
In order to solve the above technical problems, embodiments of the present invention provide a kind of balance of voltage method, it is applied to the change of current
Device, comprising:
Obtain the modulating wave of the single bridge arm of inverter；
The investment submodule total number of single bridge arm is calculated according to modulating wave and system parameter；
Determine the quantity for putting into the submodule of single bridge arm in each default submodule grouping respectively；Wherein, each
Default submodule grouping puts into the sum of submodule quantity of single bridge arm and is equal to investment submodule total number；
Obtain the current direction of single bridge arm；
The state of each submodule in the submodule of single bridge arm is put into according to current direction control；Wherein, submodule
State include charged state and discharge condition.
Embodiments of the present invention additionally provide a kind of voltage balancing device, comprising: first obtain module, computing module,
Determining module, second obtain module and control module；
First obtains module, obtains the modulating wave of the single bridge arm of inverter；
Computing module calculates the investment submodule total number of single bridge arm according to modulating wave and system parameter；
Determining module determines the quantity for putting into the submodule of single bridge arm in each default submodule grouping respectively；
Wherein, each default submodule grouping puts into the sum of submodule quantity of single bridge arm equal to investment submodule total number；
Second obtains module, obtains the current direction of single bridge arm；
Control module is put into the state of each submodule in the submodule of single bridge arm according to current direction control, is made
Single bridge arm is in balance of voltage state；Wherein, the state of submodule includes charged state and discharge condition.
Embodiment of the present invention in terms of existing technologies, determines the submodule quantity on single bridge arm in inverter
When, the submodule quantity for the single bridge arm for needing to put into each default submodule grouping is determined respectively, according to single bridge arm
Current direction determine to put into the state of each submodule of the single bridge arm so that single bridge arm meets electric voltage equalization control
System, and the voltage harmonic of inverter output is smaller, DC voltage is more stable, can be realized the Pressure and Control to single bridge arm, has
Effect reduces the time of submodule block sequencing cost, and then shortens the control period of whole system, improves the switch of submodule
Frequency directly selects submodule appropriate to put into single bridge arm in the grouping of default submodule, can be with the control of accuracy
The quantity of submodule on single bridge arm, reduces the complexity of system, improves the economy of inverter.
In addition, before the modulating wave for obtaining single bridge arm, balance of voltage method further include: by son whole in inverter
Module is equally assigned into N number of default submodule grouping, wherein N is the positive integer greater than 1；The voltage value of each submodule is obtained,
Submodule in each default submodule grouping is ranked up according to voltage value.
In the embodiment, whole submodules in inverter are grouped and are sorted in advance, so as to single bridge
When arm carries out submodule configuration, the submodule setup time of single bridge arm is effectively reduced, reduces the complicated journey of configuration operation
Degree, further improves the operation efficiency of inverter.
In addition, inverter includes the valve control device of at least one, sort algorithm is provided in valve control device；Obtain every height
The voltage value of module is ranked up the submodule in each default submodule grouping according to voltage value, comprising: pass through at least one
The sort algorithm being arranged in a valve control device is ranked up the submodule in each default submodule grouping according to voltage value.
In addition, including being provided with sort algorithm in field-programmable gate array FPGA, FPGA in valve control device；By at least
The sort algorithm being arranged in one valve control device arranges the submodule in each default submodule grouping according to voltage value
Sequence, comprising: the submodule in each default submodule grouping is carried out according to voltage value by the sort algorithm being arranged in FPGA
Sequence.
In addition, the state of submodule includes excision state and investment state；If the modulating wave of single bridge arm is A, submodule
Set voltage value as B, put into the submodule of single bridge arm in investment state submodule number indicate are as follows: N=
Round (A/B), wherein round function representation is to take the integer being greater than or equal to except formula resulting value.
In addition, submodule whole in inverter is equally assigned into N number of default submodule grouping, specifically includes: pressing
Submodule whole in inverter is equally assigned into N number of default submodule grouping according to the physical location of submodule；Alternatively, according to
Submodule whole in inverter is equally assigned into N number of default submodule and is grouped by the physics number of submodule.
In the embodiment, the grouping of submodule can be ensured when being ranked up to submodule, reduce answering for operation
Miscellaneous degree improves operation efficiency.
In addition, single bridge arm includes upper bridge arm and lower bridge arm；It puts into the number of the submodule of bridge arm and puts into down
The sum of number of submodule of bridge arm, to put into submodule total number.
In addition, modulating wave is the voltage control signal of single bridge arm；Single bridge arm exports correspondence under the control of modulating wave
Voltage value.
In addition, the current direction of single bridge arm includes charging direction and course of discharge；It charges direction are as follows: electric current is from single bridge
The anode of arm flows into, and flows out from the cathode of single bridge arm；Course of discharge are as follows: electric current is flowed into from the cathode of single bridge arm, from single
The anode outflow of bridge arm.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the flow chart of balance of voltage method in first embodiment of the invention；
Fig. 2 is the electrical block diagram of converter bridge arm in first embodiment of the invention；
Fig. 3 is the flow chart of balance of voltage method in second embodiment of the invention；
Fig. 4 is VSC-HVDC model simulation result schematic diagram in second embodiment of the invention；
Fig. 5 is the structural schematic diagram of voltage balancing device in third embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of balance of voltage methods, are applied to inverter, specific implementation process is such as
Shown in Fig. 1.It should be noted that inverter is direct current for direct current to be converted to alternating current, or by AC conversion.
Step 101: obtaining the modulating wave of the single bridge arm of inverter.
Specifically, can determine that the output voltage values of the single bridge arm according to the modulating wave on single bridge arm, wherein should
Modulating wave is the voltage control signal of single bridge arm, and single bridge arm exports corresponding voltage value under the control of modulating wave, changing
Flowing alternating current in device is usually three-phase, when converting alternating current to direct current, the alternating current to every phase is needed to rectify, single
It include upper bridge arm and lower bridge arm in a bridge arm, as shown in Fig. 2, wherein including two single bridge arms in every phase alternating current.One tool
During body is realized, upper bridge arm and the modulating wave of lower bridge arm are opposite in a single bridge arm, and are led in upper bridge arm and lower bridge arm
The number of logical submodule is not identical, wherein the number of the submodule of upper bridge arm conducting subtracts the submodule of lower bridge arm conducting
Number is the modulating wave of single bridge arm.
May also be different it should be noted that the submodule quantity possibility for including in upper bridge arm and lower bridge arm is identical, individually
Submodule in bridge arm is in investment state or excision state according to control signal, and the capacitor put into the submodule of state may
Being electrically charged may also be discharged, herein in the specific implementation, only considering the submodule for being in investment state when calculating modulating wave.Separately
Outside, the modulating wave of bridge arm single for determination also has other modes, is merely illustrative, is not specifically limited herein.
Step 102: the investment submodule total number of single bridge arm is calculated according to modulating wave and system parameter.
Specifically, the state of submodule includes investment state and excision state, investment state indicates meeting in single bridge arm
Use the submodule arrived.
One in the specific implementation, submodule sets voltage value as B if the modulating wave of single bridge arm is A, is put into individually
The number of submodule in the submodule of bridge arm in investment state indicates are as follows: N=round (A/B), wherein round function table
It is shown as taking the integer being greater than or equal to except formula resulting value, the setting voltage value of submodule can be default, not limit specifically
System.
Step 103: determining the quantity for putting into the submodule of single bridge arm in each default submodule grouping respectively.
Wherein, it is total equal to investment submodule to put into the sum of submodule quantity of single bridge arm for each default submodule grouping
Number.
Specifically, each the submodule quantity in default submodule grouping may it is identical may also be different, it is each default
Submodule grouping puts into the submodule quantity of single bridge arm also without limitation respectively, it is ensured that each default submodule grouping investment
The sum of submodule quantity to single bridge arm is equal with investment submodule total number.
It should be noted that default submodule grouping is after whole submodules is grouped and is ranked up in advance
Determining, it is grouped specifically, submodule whole in inverter is equally assigned into N number of default submodule, wherein N is greater than 1
Positive integer；The voltage value for obtaining each submodule carries out the submodule in each default submodule grouping according to voltage value
Sequence.Wherein, whole submodules, which can be the submodule for including in single bridge arm and be also possible in entire inverter, includes
Whole submodules, whether whole submodules in the whole submodules or inverter in single bridge arm are required in advance
Submodule is grouped.
Specifically, submodule whole in inverter is equally assigned into N number of default submodule grouping, comprising: press
Submodule whole in inverter is equally assigned into N number of default submodule grouping according to the physical location of submodule；Alternatively, according to
Submodule whole in inverter is equally assigned into N number of default submodule and is grouped by the physics number of submodule.For example, according to son
The physics number of module is grouped submodule, it is assumed that and there are 100 submodules, is equally divided into 2 groups, every group of 50 submodules,
The first default submodule grouping that is divided into that physics number is 1-50, physics number is that 51-100 is that the second default submodule divides
Group.It should be noted that the term " first ", " second " etc. in specification of the invention be used to distinguish similar objects, and
It is not necessarily used for describing specific sequence or precedence.
Preferably, the total number of single bridge arm submodule is even number in general inverter, by the submodule of single bridge arm
2 cannot be equally divided into if the total number of single bridge arm daughter neutron module is not even number by being equally divided into 2 default submodule groupings
A default submodule grouping, can also according to circumstances be grouped, specifically with no restrictions.Wherein, the valve control device control in inverter
The grouping and sequence of system module are provided with sequence specifically, inverter includes the valve control device of at least one in valve control device
Algorithm；The voltage value for obtaining each submodule is ranked up the submodule in each default submodule grouping according to voltage value,
Include: the sort algorithm that is arranged in the valve control device by least one to the submodule in each default submodule grouping according to
Voltage value is ranked up.If a valve control device can satisfy operation requirement, one valve control device of setting carries out submodule
Sequence, taken long time if a valve control device is ranked up, settable two or at least two valve control device to submodule
It is grouped sequence, specific judgment basis are as follows: whether can complete to submodule in an execution cycle of valve control device
If can complete a valve control device is arranged, if cannot complete to set the packet sequencing of submodule in packet sequencing
The valve control device for setting at least two is grouped sequence to submodule.
It is noted that being ranked up in the inside of grouping to submodule, after to the grouping of default submodule according to son
The size order of module voltage is ranked up.
It should be noted that above-mentioned is that one kind illustrates to illustrating for valve control device, specific packet mode is not
It limits.Sequence is grouped to submodule by grouping, effectively shortens the sorting time of the calculating cycle of single bridge arm, is solved
It has determined the too long problem of the sorting time when submodule quantity is excessive, the switching frequency of submodule has been effectively increased, so that the change of current
Device is higher to the Pressure and Control precision of submodule, and the voltage harmonic of output is smaller, and DC voltage also can be more stable.
Step 104: obtaining the current direction of single bridge arm.
Specifically, the current direction of single bridge arm includes charging direction and course of discharge；It charges direction are as follows: electric current is from list
The anode of a bridge arm flows into, and flows out from the cathode of single bridge arm；Course of discharge are as follows: electric current is flowed into from the cathode of single bridge arm, from
The anode outflow of single bridge arm.
Step 105: the state of each submodule in the submodule of single bridge arm is put into according to current direction control.
Wherein, the state of submodule includes charged state and discharge condition.
It is put into after the quantity of submodule specifically, determining, the capacitor in submodule is likely to be at electric discharge in circuit
State, it is also possible to be in charged state, if the current direction of single bridge arm is identical as the capacitance direction of submodule, control submodule
The state of block is charged state, if the current direction of single bridge arm is different from the capacitance direction of submodule, controls the submodule
State be discharge condition.
First embodiment of the present invention master is noted that on single bridge arm that the quantity of investment submodule be in default son
It is determined in module grouping, and determines the state of submodule according to the current direction of single bridge arm.
It should be noted that the above is only limit for example, not constituting to technical solution of the present invention.
In terms of existing technologies, it when determining the submodule quantity on single bridge arm in inverter, determines respectively
The submodule quantity for the single bridge arm for needing to put into each default submodule grouping, determines according to the current direction of single bridge arm
The state of each submodule of the single bridge arm is put into out, so that single bridge arm meets voltage balance control, and inverter is defeated
Voltage harmonic out is smaller, and DC voltage is more stable, can be realized the Pressure and Control to single bridge arm, effectively reduces submodule
It sorts the time spent, and then shortens the control period of whole system, improve the switching frequency of submodule, directly default
Submodule appropriate is selected to put into single bridge arm in submodule grouping, it can be with the submodule on the single bridge arm of control of accuracy
The quantity of block reduces the complexity of system, improves the economy of inverter.
Second embodiment of the present invention is related to a kind of balance of voltage method, and second embodiment is big with first embodiment
Cause identical, be in place of the main distinction: in second embodiment of the invention, the method for salary distribution with a complete submodule is
Example illustrates the configuration process of submodule, and detailed process is as shown in figure 3, include the following steps.
It should be noted that step 201 and step 202 in first embodiment step 101 and step 102 it is identical,
Details are not described herein again,
Step 201: obtaining the modulating wave of the single bridge arm of inverter.
Step 202: the investment submodule total number n of single bridge arm is calculated according to modulating wave and system parameter.
Step 203: judging that n for even number or odd number, if even number, executes step 204；If odd number, step is executed
205。
It should be noted that present embodiment is illustrated for there are two the grouping of default submodule, it in practice can root
According to the quantity for putting into submodule for needing adaptation each to preset submodule grouping.
Step 204: the submodule number n1=n/2 of single bridge arm is put into the first default submodule grouping, second is default
The submodule number n2=n/2 of single bridge arm is put into submodule grouping.
Step 205: put into the submodule number n1=(n-1)/2 of single bridge arm in the first default submodule grouping, second
Submodule number n2=(n-1)/2+1 of single bridge arm is put into default submodule grouping.
Step 206: whether the current direction for judging single bridge arm is charging direction, if it is, thening follow the steps 207；It is no
Then, step 208 is executed.
Step 207: putting into the number of submodule in the lesser submodule of voltage value in two default submodule groupings is n2.
Step 208: putting into the number of submodule in the biggish submodule of voltage value in two default submodule groupings is n2.
Specifically, the single bridge arm of the investment submodule number for odd number, when current direction is charging direction, by two
The quantity of the submodule of lesser that group selection investment of voltage value in a default submodule grouping is n2, voltage and that big group
The quantity for selecting the submodule of investment is n1；When current direction is course of discharge, by the electricity in two default submodule groupings
The quantity that pressure is worth the submodule of biggish that group selection investment is n2, the quantity for the submodule that voltage and that small group selection are put into
For n1；Wherein, the voltage value for presetting submodule grouping is the sum of the voltage value of submodule.
It is noted that being built on matrix labotstory software (MATLAB, full name: Matrix Laboratory) soft
Property direct current transportation model, controls submodule using the balance of voltage method in first or second embodiment, the flexibility
The system parameter setting of direct current transportation model is as shown in table 1:
| Alternating voltage | Bridge arm reactor | Half-bridge submodule number |
| 10000V | 8mH | 22 |
| DC voltage | Submodule capacitor | Submodule reference voltage |
| ±10000V | 20mF | 909V |
Table 1: the system parameter of VSC-HVDC model is emulated
Wherein, simulation result includes 22 submodules on each bridge arm as shown in figure 4,6 bridge arms altogether, submodule
Reference voltage is 909V, and the undulating value for the three-phase submodule voltage that the simulation result on VSC-HVDC model is shown is low
In 0.5V, fluctuation range is being lower than 0.05%, is meeting engine request.Facilitate accordingly, for the less system of submodule quantity
The stability of Pressure and Control is improved, the work which is suitable for extensive inverter submodule is able to achieve good
Equalizing effect, additionally it is possible to meet the purpose of the packet sequencing of submodule.
It should be noted that the above is only limit for example, not constituting to technical solution of the present invention.
The step of various methods divide above, be intended merely to describe it is clear, when realization can be merged into a step or
Certain steps are split, multiple steps are decomposed into, as long as including identical logical relation, all in the protection scope of this patent
It is interior；To adding inessential modification in algorithm or in process or introducing inessential design, but its algorithm is not changed
Core design with process is all in the protection scope of the patent.
Third embodiment of the invention is related to a kind of voltage balancing device, as shown in Figure 5, comprising: first obtains module
501, computing module 502, determining module 503, second obtain module 504 and control module 505.
First obtains module 501, obtains the modulating wave of the single bridge arm of inverter.
Computing module 502 calculates the investment submodule total number of single bridge arm according to modulating wave and system parameter.
Determining module 503 determines the number for putting into the submodule of single bridge arm in each default submodule grouping respectively
Amount；Wherein, each default submodule grouping puts into the sum of submodule quantity of single bridge arm equal to investment submodule total number.
Second obtains module 504, obtains the current direction of single bridge arm.
Control module 505 puts into the state of each submodule in the submodule of single bridge arm according to current direction control,
Single bridge arm is set to be in balance of voltage state；Wherein, the state of submodule includes charged state and discharge condition.
It is not difficult to find that present embodiment is Installation practice corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
It is noted that each module involved in present embodiment is logic module, and in practical applications, one
A logic unit can be a physical unit, be also possible to a part of a physical unit, can also be with multiple physics lists
The combination of member is realized.In addition, in order to protrude innovative part of the invention, it will not be with solution institute of the present invention in present embodiment
The technical issues of proposition, the less close unit of relationship introduced, but this does not indicate that there is no other single in present embodiment
Member.
It will be understood by those skilled in the art that implementing the method for the above embodiments is that can pass through
Program is completed to instruct relevant hardware, which is stored in a storage medium, including some instructions are used so that one
A equipment (can be single-chip microcontroller, chip etc.) or processor (processor) execute each embodiment the method for the application
All or part of the 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.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of balance of voltage method, which is characterized in that be applied to inverter, comprising:
Obtain the modulating wave of the single bridge arm of the inverter；
The investment submodule total number of the single bridge arm is calculated according to the modulating wave and system parameter；
Determine the quantity for putting into the submodule of the single bridge arm in each default submodule grouping respectively；Wherein, each
The default submodule grouping puts into the sum of submodule quantity of the single bridge arm equal to the investment submodule total number；
Obtain the current direction of the single bridge arm；
The state of each submodule in the submodule of the single bridge arm is put into according to current direction control；Its
In, the state of the submodule includes charged state and discharge condition.
2. balance of voltage method according to claim 1, which is characterized in that the modulating wave for obtaining single bridge arm it
Before, the balance of voltage method further include:
The submodule whole in the inverter is equally assigned into N number of default submodule grouping, wherein N is greater than 1
Positive integer；
The voltage value for obtaining each submodule, to the submodule in each default submodule grouping according to voltage
Value is ranked up.
3. balance of voltage method according to claim 2, which is characterized in that the inverter includes the valve control of at least one
Device is provided with sort algorithm in the valve control device；
The voltage value for obtaining each submodule, to the submodule in each default submodule grouping according to voltage
Value is ranked up, comprising:
By the sort algorithm that is arranged at least one the valve control device in each default submodule grouping
The submodule be ranked up according to voltage value.
4. balance of voltage method according to claim 3, which is characterized in that include field-programmable in the valve control device
The sort algorithm is provided in gate array FPGA, the FPGA；
It is described by the sort algorithm that is arranged at least one the valve control device to each default submodule point
The submodule in group is ranked up according to voltage value, comprising:
The submodule in each default submodule grouping is pressed by the sort algorithm being arranged in the FPGA
It is ranked up according to voltage value.
5. balance of voltage method according to claim 1, which is characterized in that the state of the submodule includes excision state
With investment state；
If the modulating wave of the single bridge arm is A, the submodule sets voltage value as B, described to put into the list
The number of submodule in the submodule of a bridge arm in the investment state indicates are as follows: N=round (A/B), wherein round
Function representation is to take the integer being greater than or equal to except formula resulting value.
6. balance of voltage method according to claim 2, which is characterized in that it is described will be whole in the inverter described in
Submodule is equally assigned into N number of default submodule grouping, is specifically included:
The submodule whole in the inverter is equally assigned into N number of default son according to the physical location of the submodule
Module grouping；Alternatively, the physics according to the submodule is numbered the submodule mean allocation whole in the inverter
It is grouped for N number of default submodule.
7. balance of voltage method according to claim 1-4, which is characterized in that the single bridge arm includes upper bridge
Arm and lower bridge arm；
It puts into the number of the submodule of the upper bridge arm and puts into the sum of the number of submodule of the lower bridge arm, be described
Put into submodule total number.
8. balance of voltage method according to claim 1-4, which is characterized in that the modulating wave is described single
The voltage control signal of bridge arm；
The single bridge arm exports corresponding voltage value under the control of the modulating wave.
9. balance of voltage method according to claim 1-4, which is characterized in that the electric current side of the single bridge arm
To including charging direction and course of discharge；
The charging direction are as follows: electric current is flowed into from the anode of the single bridge arm, is flowed out from the cathode of the single bridge arm；
The course of discharge are as follows: electric current is flowed into from the cathode of the single bridge arm, from the anode outflow of the single bridge arm.
10. a kind of voltage balancing device characterized by comprising the first acquisition module, computing module, determining module, second are obtained
Modulus block and control module；
Described first obtains module, obtains the modulating wave of the single bridge arm of the inverter；
The computing module, the investment submodule for calculating the single bridge arm according to the modulating wave and system parameter are always a
Number；
The determining module determines the number for putting into the submodule of the single bridge arm in each default submodule grouping respectively
Amount；Wherein, each default submodule grouping puts into the sum of submodule quantity of the single bridge arm equal to the investment
Submodule total number；
Described second obtains module, obtains the current direction of the single bridge arm；
The control module, put into according to current direction control it is each in the submodule of the single bridge arm described in
The state of submodule makes the single bridge arm be in balance of voltage state；Wherein, the state of the submodule includes charged state
And discharge condition.
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