CN110474551A - Control method is moved back in a kind of submodule throwing of modularization multi-level converter - Google Patents
Control method is moved back in a kind of submodule throwing of modularization multi-level converter Download PDFInfo
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- CN110474551A CN110474551A CN201910800428.7A CN201910800428A CN110474551A CN 110474551 A CN110474551 A CN 110474551A CN 201910800428 A CN201910800428 A CN 201910800428A CN 110474551 A CN110474551 A CN 110474551A
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- submodule
- trun
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- throwing
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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
- 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
Abstract
Control method is moved back in the submodule throwing that the present invention discloses a kind of modularization multi-level converter, is included the following steps: for submodule to be split as investment group and is had dropped out group, and be ranked up respectively in two groups of submodules, generates packet sequencing result；The submodule investment data computational submodule investment variation number Δ N of host is controlled according to inverter system；According to submodule electric voltage equalization situation calculate this submodule need to put into number TRUN_ON and need to exit number TRUN_OFF, TRUN_ON and TRUN_OFF difference be equal to Δ N；This submodule for needing to exit, number TRUN_OFF are selected in investment group；This submodule for needing to put into, number TRUN_OFF are selected having dropped out group；Number demand is put into meet the submodule of inverter system；Valve control device forms submodule switch command and is sent to each submodule.Such control method throws according to submodule electric voltage equalization situation and the adjustment of submodule packet sequencing and moves back number, can effective control submodule switching frequency and balance submodule capacitor voltage.
Description
Technical field
The present invention relates to a kind of throwings of the submodule of modularization multi-level converter to move back control method, is suitable for all kinds of modularizations
The valve control device of multilevel converter system.
Background technique
It is electric that modular multilevel converter system is widely used in flexible DC transmission engineering and static synchronous compensator etc.
Power field of electronic systems.Valve control device is the intermediate bridge between inverter system control host and submodule, is meeting the change of current
On the submodule investment number Demand Base of device system, submodule capacitor voltage should be balanced, effective control submodule is also wanted to open
Frequency is closed to reduce switching loss.
It is mainly as follows that control strategy is moved back in traditional submodule throwing: being ranked up to the capacitance voltage value of submodule, works as the change of current
When device system is in discharge regime, the lesser submodule of voltage is put into according to ranking results；When inverter system is in charging rank
Duan Shi puts into the biggish submodule of voltage according to ranking results.State is moved back because not considering that submodule switch is thrown, according only to capacitor electricity
It is higher that pressure ranking results selection submodule will lead to submodule switching frequency, keeps inverter system switching loss larger.This case by
This is generated.
Summary of the invention
The purpose of the present invention is that control method, root are moved back in the submodule throwing for providing a kind of modularization multi-level converter
According to submodule electric voltage equalization situation and submodule packet sequencing adjustment throw move back number, can effectively control submodule switching frequency with
And balance submodule capacitor voltage.
In order to achieve the above objectives, solution of the invention is:
Control method is moved back in a kind of submodule throwing of modularization multi-level converter, is included the following steps:
Step 1, submodule is split as investment group and has dropped out group, and be ranked up respectively in two groups of submodules, it is raw
At grouping ranking results；
Step 2, the submodule investment data computational submodule investment variation number Δ of host is controlled according to inverter system
N；
Step 3, calculate that this submodule needs to put into number TRUN_ON and needs are moved back according to submodule electric voltage equalization situation
The difference of number TRUN_OFF out, TRUN_ON and TRUN_OFF are equal to Δ N；
Step 4, this submodule for needing to exit, number TRUN_OFF are selected in investment group；Having dropped out group
Select this submodule for needing to put into, number TRUN_OFF；Number need are put into meet the submodule of inverter system
It asks；
Step 5, valve control device forms submodule switch command and is sent to each submodule.
In above-mentioned steps 1, state is moved back according to the throwing of the switch of submodule and submodule is split as investment group and has dropped out group.
In above-mentioned steps 1, voltage sequence is carried out in two groups of submodules according to capacitance voltage value respectively, generates packet sequencing knot
Fruit.
In above-mentioned steps 3, if submodule voltage deviation is big, the larger value is taken in TRUN_ON and TRUN_OFF；If submodule
Voltage deviation is small, then takes smaller value in TRUN_ON and TRUN_OFF.
In above-mentioned steps 4, when inverter system is in the charging stage, the maximum TRUN_ of voltage is selected in investment group
OFF submodule selects the smallest TRUN_ON submodule of voltage having dropped out group.
In above-mentioned steps 4, when inverter system is in discharge regime, the smallest TRUN_ of voltage is selected in investment group
OFF submodule selects the maximum TRUN_ON submodule of voltage having dropped out group.
After adopting the above scheme, the present invention is summarized using valve control device receives each submodule capacitor voltage value and submodule
Investment exits state, is split as investment group according to the submodule throwing state of moving back and has dropped out group, according to capacitance voltage value at two groups
Submodule carries out voltage sequence respectively, generates packet sequencing result.Valve control device receives the submodule of inverter system control host
Block investment data simultaneously calculate investment variation number Δ N；Valve control device picks out this from packet sequencing result and needs to change life
The submodule of writ state is TRUN_OFF in the submodule number that investment group needs to exit, and is having dropped out what group needs were put into
Submodule number TRUN_ON, wherein the difference of TRUN_ON and TRUN_OFF is equal to Δ N to meet the submodule of inverter system and throw
Enter number demand；Valve control device adjusts TRUN_ON and TRUN_OFF according to submodule electric voltage equalization situation, can effectively control son
Module switch frequency and balance submodule capacitor voltage, can be applicable to all kinds of modular multilevels in power electronic system field
Inverter system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for one bridge arm of modularization multi-level converter that the present invention applies；
Fig. 2 is valve control device, the schematic diagram for controlling host and submodule；
Fig. 3 is that control method flow chart is moved back in submodule throwing；
Fig. 4 is charging stage and discharge regime selection submodule schematic diagram.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
As shown in Figure 1, being the schematic diagram of one bridge arm of modularization multi-level converter, connect to be formed using multiple submodule
One bridge arm access system again.
As shown in Fig. 2, valve control device is the intermediate bridge between inverter system control host and submodule, inverter system
Submodule investment number is sent to valve control device by system control host, while each submodule block message summarizes and feeds back to valve control dress
It sets, valve control device forms submodule switch command using control method.
As shown in figure 3, control method is moved back in the submodule throwing that the present invention provides a kind of modularization multi-level converter, including such as
Lower step:
Step 1, it moves back state according to the throwing of the switch of submodule submodule is split as investment group and to have dropped out group, according to electricity
Hold voltage value and carry out voltage sequence respectively in two groups of submodules, generates packet sequencing result；
Step 2, the submodule investment data computational submodule investment variation number of host is controlled according to inverter system, this
Secondary investment variation number is the difference that Δ N is equal to that this submodule puts into number ON2 and last time submodule puts into number ON1；
Step 3, calculate that this submodule needs to put into number TRUN_ON and needs are moved back according to submodule electric voltage equalization situation
The difference of number TRUN_OFF out, TRUN_ON and TRUN_OFF are equal to Δ N, put into number to meet the submodule of inverter system
Demand.It is adjusted according to submodule electric voltage equalization situation (submodule voltage deviation=maximal submodule voltage-minimum submodule voltage)
Whole TRUN_ON and TRUN_OFF, can effectively control submodule switching frequency and each submodule capacitor voltage of balance, such as
When group module voltage deviation is larger, TRUN_ON and TRUN_OFF take the larger value；When group module voltage deviation is smaller, TRUN_
ON and TRUN_OFF take smaller value.
Step 4, the submodule (its number is TRUN_OFF) that this needs exits is selected in investment group, is having dropped out group
The submodule (its number is TRUN_OFF) that this needs is put into is selected, the difference of TRUN_ON and TRUN_OFF are equal to Δ N, with full
The submodule of sufficient inverter system puts into number demand；Specifically, it when inverter system is in the charging stage, puts into
Group selects the biggish TRUN_OFF submodule of voltage, selects the lesser TRUN_ON submodule of voltage having dropped out group；When changing
When stream device system is in discharge regime, the lesser TRUN_OFF submodule of voltage is selected in investment group, is chosen having dropped out group
Select the biggish TRUN_ON submodule of voltage.It can cooperate shown in Fig. 4.
Step 5, valve control device forms submodule switch command and is sent to each submodule.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (6)
1. control method is moved back in a kind of submodule throwing of modularization multi-level converter, it is characterised in that include the following steps:
Step 1, submodule is split as investment group and has dropped out group, and be ranked up respectively in two groups of submodules, generated and divide
Group ranking results；
Step 2, the submodule investment data computational submodule investment variation number Δ N of host is controlled according to inverter system；
Step 3, calculate that this submodule needs to put into number TRUN_ON and needs exit according to submodule electric voltage equalization situation
The difference of number TRUN_OFF, TRUN_ON and TRUN_OFF are equal to Δ N；
Step 4, this submodule for needing to exit, number TRUN_OFF are selected in investment group；It is selected having dropped out group
This needs the submodule put into, number TRUN_OFF；Number demand is put into meet the submodule of inverter system；
Step 5, valve control device forms submodule switch command and is sent to each submodule.
2. control method is moved back in a kind of submodule throwing of modularization multi-level converter as described in claim 1, it is characterised in that:
In the step 1, state is moved back according to the throwing of the switch of submodule and submodule is split as investment group and has dropped out group.
3. control method is moved back in a kind of submodule throwing of modularization multi-level converter as described in claim 1, it is characterised in that:
In the step 1, voltage sequence is carried out in two groups of submodules according to capacitance voltage value respectively, generates packet sequencing result.
4. control method is moved back in a kind of submodule throwing of modularization multi-level converter as described in claim 1, it is characterised in that:
In the step 3, if submodule voltage deviation is big, the larger value is taken in TRUN_ON and TRUN_OFF；If submodule voltage deviation
It is small, then smaller value is taken in TRUN_ON and TRUN_OFF.
5. control method is moved back in a kind of submodule throwing of modularization multi-level converter as described in claim 1, it is characterised in that:
In the step 4, when inverter system is in the charging stage, the maximum TRUN_OFF submodule of voltage is selected in investment group
Block selects the smallest TRUN_ON submodule of voltage having dropped out group.
6. control method is moved back in a kind of submodule throwing of modularization multi-level converter as described in claim 1, it is characterised in that:
In the step 4, when inverter system is in discharge regime, the smallest TRUN_OFF submodule of voltage is selected in investment group
Block selects the maximum TRUN_ON submodule of voltage having dropped out group.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910800428.7A CN110474551A (en) | 2019-08-28 | 2019-08-28 | Control method is moved back in a kind of submodule throwing of modularization multi-level converter |
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| CN201910800428.7A CN110474551A (en) | 2019-08-28 | 2019-08-28 | Control method is moved back in a kind of submodule throwing of modularization multi-level converter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226959A (en) * | 2015-09-30 | 2016-01-06 | 安徽理工大学 | The control device of modular multilevel high voltage converter and control method |
| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
| WO2018095552A1 (en) * | 2016-11-28 | 2018-05-31 | Siemens Aktiengesellschaft | Power converter |
| CN109067222A (en) * | 2018-08-07 | 2018-12-21 | 西安西电电力系统有限公司 | A kind of IGBT control method based on MMC-HVDC |
-
2019
- 2019-08-28 CN CN201910800428.7A patent/CN110474551A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226959A (en) * | 2015-09-30 | 2016-01-06 | 安徽理工大学 | The control device of modular multilevel high voltage converter and control method |
| WO2018095552A1 (en) * | 2016-11-28 | 2018-05-31 | Siemens Aktiengesellschaft | Power converter |
| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
| CN109067222A (en) * | 2018-08-07 | 2018-12-21 | 西安西电电力系统有限公司 | A kind of IGBT control method based on MMC-HVDC |
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Application publication date: 20191119 |