CN103066805B - Capacitor voltage balance control method based on bundling type switching of multiple sub modules - Google Patents
Capacitor voltage balance control method based on bundling type switching of multiple sub modules Download PDFInfo
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- CN103066805B CN103066805B CN201210533982.1A CN201210533982A CN103066805B CN 103066805 B CN103066805 B CN 103066805B CN 201210533982 A CN201210533982 A CN 201210533982A CN 103066805 B CN103066805 B CN 103066805B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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Abstract
The invention provides a capacitor voltage balance control method based on bundling type switching of multiple sub modules. By means of a bundling mode, the quantity level of the sub modules of a modularization multi-level converter valve is degraded for one level, lowering of the capacitor voltage balance control calculated amount is facilitated, and the requirements for control equipment are lowered. After the sub modules are bundled into a module group, switching is conducted overall, the voltage balance of the sub module group is achieved by using a capacitor voltage balance algorithm, voltage-sharing is achieved on the inner portion of the sub module group through self-adaptation, and total voltage-sharing of the sub modules can be achieved. By means of the capacitor voltage balance control method based on bundling type switching of the multiple sub modules, the problem of the control of a high-capacity voltage source converter based high voltage direct current converter valve based on a modularization multi-level converter mode can be effectively solved, and controlling and monitoring of the converter valve with large-scale amount can be achieved.
Description
Technical field
The invention belongs to flexible AC transmission technical field, be specifically related to a kind of capacitance voltage balance control method based on multiple submodule cluster switchings.
Background technology
Current, the various Power Electronic Circuit based on all-controlling power electronics device IGBT have been applied to the fields such as electric power system, locomotive traction, Aero-Space more and more.Along with the development of power electronic technology and material, manufacturing process, the through-current capability of IGBT device is also more and more stronger, makes it also obtain important performance space in direct current transportation field, has directly promoted birth and the development of Technology of HVDC based Voltage Source Converter.Different from traditional high voltage dc transmission technology, flexible DC power transmission converter, to have substituted Thyristors in series converter valve by IGBT high-voltage commutation valve in series, has formed the flexible direct current converter of voltage-source type.Flexible DC power transmission can be realized to remote middle-size and small-size isolated, weak load and powering; Can carry out independent, accurately, meritorious/Reactive Power Control flexibly, improve economy and the stability of system load flow transmission; In the time that trend is reversed, direct voltage polarity is constant, convenient formation multi-terminal HVDC transmission system; The capacity of short circuit that does not increase system in the time being connected system short-circuit, is conducive to limiting short-circuit current, stops the fault pervasion of system; Reactive power support and FREQUENCY CONTROL can be provided, have a special advantage for the regenerative resource such as wind energy turbine set and distributed power generation is grid-connected; After electric network fault, can provide black startup power supply being connected, accelerate the fast restoration capabilities after electric network fault; Current conversion station floor space greatly reduces with respect to conventional DC.
The abundant performance advantage of Technology of HVDC based Voltage Source Converter has attracted numerous scientific research technical staff put into relevant research and put into practice in work, its flexibly control performance also make the control guard method of flexible direct current and control protective unit become the study hotspot of flexible direct current technology.In the control of the flexible direct current based on modularization multi-level converter topological structure, be a very important link in whole control protection system to the control protection of converter submodule inside.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of capacitance voltage balance control method based on multiple submodule cluster switchings, the flexible DC power transmission converter valve control problem of large capacity based on modularization multi-level converter mode can be effectively solved, the converter valve operation control & monitor of extensive quantity can be realized; By binding mode, make a rank of submodule quantity rank decline of modular multilevel converter valve, be conducive to the reduction of capacitance voltage balance control amount of calculation, reduce the requirement to control appliance.
In order to realize foregoing invention object, the present invention takes following technical scheme:
A kind of capacitance voltage balance control method based on multiple submodule cluster switchings is provided, said method comprising the steps of:
Step 1: upload and gather submodule state;
Step 2: the M that brachium pontis an is comprised submodule divides into groups to bundle, and obtains m module group, and the voltage of m module group is sorted, and described module group drops into as a whole or cuts out;
Step 3: the clearly current total submodule number that drops into of needing, and then now needed the number m ' of module group dropping into;
Step 4: select switching module group number and concrete module group according to the brachium pontis sense of current and module capacitance voltage ranking results.
In described step 1, brachium pontis segmentation control unit is uploaded to brachium pontis by submodule state and gathers control unit, and described brachium pontis gathers control unit the submodule state receiving is gathered.
In described step 2, brachium pontis gathers control unit M submodule is divided into groups to bundle according to n one group, obtains module group, wherein a m=M/n.
Described brachium pontis gathers control unit the voltage of m module group is sorted according to principle from big to small.
In described step 3, the instruction issuing according to upper strata DC control and protection system adopts the clearly current total submodule number that needs input of minimum approximatioss, and then is now needed the number m ' of the module group dropping into.
Described step 4 comprises the following steps:
Step 3-1: flow to negative busbar as positive direction taking positive bus-bar, if now the sense of current, for just, is selected voltage and minimum m
1' individual submodule group drops into, remaining m-m
1' individual submodule cuts out;
Step 3-2: flow to positive bus-bar as negative direction taking negative busbar, if now the sense of current, for negative, is selected voltage and maximum m
2' individual submodule group drops into, remaining m-m
2' individual submodule group cuts out.
Described brachium pontis segmentation control unit, brachium pontis gather the valve base control appliance that control unit, light CT merging and interface unit, circulation control unit and MMC valve monitoring unit have formed modularization multi-level converter control protection system; Described brachium pontis segmentation control unit is uploaded to brachium pontis by submodule state and gathers control unit and gather; Described circulation control unit issues modulation voltage information, by this modulation voltage information, gathers and calculates, the switching of determinant module; MMC valve monitoring unit monitors the state of MMC valve, and monitor message is uploaded to host computer.
Compared with prior art, beneficial effect of the present invention is:
1. the flexible DC power transmission converter valve control problem of large capacity based on modularization multi-level converter mode can be effectively solved, the converter valve operation control & monitor of extensive quantity can be realized;
2. this patent, by binding mode, makes a rank of submodule quantity rank decline of modular multilevel converter valve, is conducive to the reduction of capacitance voltage balance control amount of calculation, has reduced the requirement to control appliance;
3. after submodule is tied to a module group, overall switching, and utilize capacitance voltage balanced algorithm to realize the balance of voltage of submodule group, all press by self adaptation submodule group inside, can realize totally all pressing of submodule.
Brief description of the drawings
Fig. 1 is the capacitance voltage balance control topology diagram based on multiple submodule cluster switchings.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Modularization multi-level converter (Module Multilevel Convertor, be called for short MMC converter) be composed in series by multiple submodules, need to carry out different real-time switching control to independent submodule according to capacitance voltage and submodule operating state, level number is more, control cycle is shorter in real time, the more difficult realization of capacitance voltage balance control.High-voltage large-capacity flexible DC power transmission converter valve based on modularization multi-level converter MMC technology, the submodule of required serial connection is up to hundreds of and even thousands of, each submodule must be controlled separately, valve base control appliance VBC is by adopting layer and section processing mode to control separately each submodule, as the temporary location of valve base control appliance---brachium pontis gathers unit, that the submodule information of the whole brachium pontis of multiple brachium pontis segmenting units is gathered, arrange, gather the temporary location that bridge arm voltage equilibrium strategy is processed and brachium pontis Global Macros strategy is implemented, and as bottom control unit---the brachium pontis segmenting unit of valve base control appliance, be that each brachium pontis cross-talk module information is gathered, arranges, realizes the bottom control unit that brachium pontis Segmented electrical pressure balanced strategy is processed and brachium pontis sectionalised protection strategy is implemented.
As Fig. 1, modularization multi-level converter by 3 mutually totally 6 brachium pontis form, the balance control the present invention relates to be the capacitance voltage equilibrium strategy based on modularization multi-level converter valve.Capacitance voltage equilibrium strategy gathers control unit controller by brachium pontis segmentation control unit and brachium pontis and jointly completes; its bridge arm segmentation control unit has been responsible for the communication between converter valve; be responsible for collecting submodule capacitance voltage and running status; drop into and exit and other protection controls to submodule transmission submodule; each brachium pontis segmentation controller charge of overseeing submodule state; brachium pontis gathers control unit to be responsible for each state of uploading by brachium pontis and to gather, and has been responsible for the balance control of brachium pontis entirety submodule capacitance voltage simultaneously.
Brachium pontis gathers the submodule state that control unit is responsible for brachium pontis segmentation control unit to upload and gathers, and submodule is divided into groups, a brachium pontis comprises 540 modules, every 9 modules are bundled into a module group, brachium pontis will comprise 60 module groups altogether, brachium pontis gathers control unit will carry out overall switching to 60 module groups, and whole brachium pontis gathers control unit and only need to sort to 60 module groups, and 60 module group voltages are carried out to capacitance voltage balance.Submodule voltage in module group is due to voltage adaptive balance, and module voltage will be consistent.According to above description, each module group be numbered N, the voltage of module group be n module in group voltage and, brachium pontis segmentation is fixing voltage addition in each group, then by voltage be uploaded to brachium pontis and gather unit.
Brachium pontis gathers control unit according to voltage request, calculates and needs the module group dropping into count m '.Again 60 module group voltage sums are sorted, and judge the brachium pontis sense of current.Then, according to the sense of current and module group voltage and sequence situation, the module group that selection will drop into.If now the sense of current is when just (flowing to negative busbar for just by positive bus-bar), select voltage and minimum m
1' individual submodule group drops into, remaining 60-m
1' individual submodule cuts out.If when now the sense of current is for negative (flowing to positive bus-bar for negative by negative busbar), select voltage and maximum m
2' individual submodule group drops into, remaining 60-m
2' individual submodule group cuts out.
Submodule in module group drops into simultaneously or cuts out, and keeps identical switching state.Each submodule Capacitance parallel connection grading resistor, submodule electric capacity discharges by grading resistor.In the time occurring between submodule in module group that voltage is uneven, the submodule that capacitance voltage is higher is larger by the electric current of grading resistor, and electric discharge is very fast; The submodule that capacitance voltage is lower is less by the electric current of grading resistor, discharges slower.Therefore,, in the time causing that due to submodule difference in module group, submodule voltage is uneven, grading resistor can play the effect of electric voltage equalization in adjustment module group.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any amendment of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. the capacitance voltage balance control method based on multiple submodule cluster switchings, is characterized in that: said method comprising the steps of:
Step 1: upload and summarizing module multilevel converter in multiple submodule states;
Step 2: the M that brachium pontis an is comprised submodule divides into groups to bundle, and obtains m module group, and the voltage of m module group is sorted, and described module group drops into as a whole or cuts out;
Step 3: the clearly current total submodule number that drops into of needing, and then now needed the number m ' of module group dropping into;
Step 4: select switching module group number and concrete module group according to the brachium pontis sense of current and module capacitance voltage ranking results;
In described step 3, the instruction issuing according to upper strata DC control and protection system adopts the clearly current total submodule number that needs input of minimum approximatioss, and then is now needed the number m ' of the module group dropping into;
Described step 4 comprises the following steps:
Step 4 ?1: flow to negative busbar as positive direction taking positive bus-bar, if now the sense of current is for just, select voltage and minimum m
1' individual submodule group drops into, remaining m ?m
1' individual submodule cuts out;
Step 4 ?2: flow to positive bus-bar as negative direction taking negative busbar, if now the sense of current is for negative, select voltage and maximum m
2' individual submodule group drops into, remaining m ?m
2' individual submodule group cuts out.
2. the capacitance voltage balance control method based on multiple submodule cluster switchings according to claim 1, it is characterized in that: in described step 1, brachium pontis segmentation control unit is uploaded to brachium pontis by submodule state and gathers control unit, and described brachium pontis gathers control unit the submodule state receiving is gathered.
3. the capacitance voltage balance control method based on multiple submodule cluster switchings according to claim 1, it is characterized in that: in described step 2, brachium pontis gathers control unit M submodule is divided into groups to bundle according to n one group, obtains module group, wherein a m=M/n.
4. the capacitance voltage balance control method based on multiple submodule cluster switchings according to claim 3, is characterized in that: described brachium pontis gathers control unit the voltage of m module group is sorted according to principle from big to small.
5. the capacitance voltage balance control method based on multiple submodule cluster switchings according to claim 2, is characterized in that: described brachium pontis segmentation control unit, brachium pontis gather the valve base control appliance that control unit, light CT merging and interface unit, circulation control unit and MMC valve monitoring unit have formed modularization multi-level converter control protection system; Described brachium pontis segmentation control unit is uploaded to brachium pontis by submodule state and gathers control unit and gather; Described circulation control unit issues modulation voltage information, by this modulation voltage information, gathers and calculates, the switching of determinant module; MMC valve monitoring unit monitors the state of MMC valve, and monitor message is uploaded to host computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103368197B (en) * | 2013-07-15 | 2015-11-25 | 国家电网公司 | The valve base control appliance of modularization multi-level converter and method |
| CN103490599A (en) * | 2013-09-16 | 2014-01-01 | 电子科技大学 | Power tube subsection grid driving circuit |
| CN104836457B (en) * | 2014-02-11 | 2017-11-07 | 华北电力大学 | A kind of modularization multi-level converter capacitance voltage is grouped balance optimizing algorithm |
| CN103929081B (en) * | 2014-04-14 | 2016-08-24 | 中国西电电气股份有限公司 | A kind of submodule method for equalizing voltage for modularization multi-level converter |
| CN104038060B (en) * | 2014-06-03 | 2016-08-24 | 中国科学院电工研究所 | Flexible direct current power transmission system modularization multi-level converter method for equalizing voltage |
| CN104038052B (en) * | 2014-06-23 | 2016-07-06 | 上海交通大学 | Modularization multi-level converter voltage balance control method |
| CN104135177B (en) * | 2014-07-24 | 2016-08-24 | 华北电力大学 | A kind of pressure equalizing control method of the submodule capacitor voltage layering being applicable to high level MMC |
| CN104767178B (en) * | 2015-04-16 | 2018-01-09 | 北京荣信慧科科技有限公司 | The protection control method of Protection control system based on bridge arm unit |
| CN106483841B (en) * | 2015-08-26 | 2019-08-30 | 国网智能电网研究院 | A kind of field adjustable and the method for testing loop current suppression policing parameter |
| CN107968587B (en) * | 2017-11-06 | 2020-09-15 | 上海交通大学 | Auxiliary converter of mixed type offshore wind field direct current converter and control method |
| CN112865162B (en) * | 2021-01-15 | 2022-12-13 | 中国南方电网有限责任公司超高压输电公司 | Communication interface method between upper computer and valve base control electronic equipment |
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| CN102916592A (en) * | 2012-11-12 | 2013-02-06 | 华北电力大学 | Submodule grouped voltage-sharing control method for modular multi-level current converter |
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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Co-patentee after: State Grid Corporation of China Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee before: STATE GRID SMART GRID Research Institute Co-patentee before: SHANGHAI MUNICIPAL ELECTRIC POWER Co. Co-patentee before: State Grid Corporation of China |
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Effective date of registration: 20170607 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: State Grid Corporation of China Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co-patentee before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Co-patentee before: State Grid Corporation of China |
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Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Patentee after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Co-patentee after: STATE GRID CORPORATION OF CHINA Address before: 102209 Beijing Changping District future science and Technology North District Smart Grid Research Institute Co-patentee before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co-patentee before: State Grid Corporation of China |
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Effective date of registration: 20181213 Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Patentee after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Co-patentee after: STATE GRID CORPORATION OF CHINA Co-patentee after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Co-patentee before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Co-patentee before: STATE GRID CORPORATION OF CHINA |
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