CN103066567B - Hierarchical sectional capacity balance control method based on switching number - Google Patents
Hierarchical sectional capacity balance control method based on switching number Download PDFInfo
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- CN103066567B CN103066567B CN201210533995.9A CN201210533995A CN103066567B CN 103066567 B CN103066567 B CN 103066567B CN 201210533995 A CN201210533995 A CN 201210533995A CN 103066567 B CN103066567 B CN 103066567B
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- brachium pontis
- submodule
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- switching
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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
Abstract
The invention provides a hierarchical sectional capacity balance control method based on switching number. The switching number of sub-modules is used as allocating objects so that flexibility of strategy operation is ensured, enormous information processing is enabled to be completed very simply, conveniently and fast, and reliability and processing speed of a system are improved. Different sub-modules are confirmed according to judgment data such as voltage feedback and current directions of all subsections so that on the premise of enabling the system to operate normally, sub-module capacitor voltage balance is realized, and stable and reliable operation of the whole bridge arm sub-module in a converter and synergy coordination of the whole bridge arm sub-module with a converter protection system are ensured.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of layer and section formula capacitive balance control method based on switching number.
Background technology
Different from traditional high voltage dc transmission technology, flexible DC power transmission converter is flexible with its control, trend is controlled and is easy to overturn, can conveniently realize reactive power support and FREQUENCY CONTROL, realizes the advantages such as black startup, becomes gradually the direct current transportation field development trend in future; Wherein, based on modularization multi-level converter, be that topological flexible DC power transmission engineering is rapidly developed.Based on MMC(Module Multilevel Convertor) the converter submodule capacitance voltage balanced algorithm of mode is the core algorithm of realizing the operation of converter valve voltage stabilization; But in large capacity, high voltage MMC flexible DC power transmission field, along with increasing of submodule number, capacitance voltage balance is controlled and is become increasingly complex.In the current disclosed data of home and overseas, seldom, relevant for control the data of plan algorithm message semantic definition about capacitance voltage, data and the patent of the large capacity that is especially distribution object based on submodule switching number, high voltage MMC current transformer submodule capacitance voltage balancing control algorithm lack especially.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of layer and section formula capacitive balance control method based on switching number, the submodule switching number of take is distribution object, guaranteed the flexibility of tactful operation, make huge information processing obtain very facilitating simple and direct mode to complete, improved system reliability and processing speed; By to bases for estimation such as each segmentation Voltage Feedback, the senses of current, determine different switching submodules, system can be guaranteed under stable operation prerequisite, realize submodule capacitance voltage balance; Guarantee the reliable and stable operation of whole brachium pontis submodule in converter and with the coordinated of converter unit protection system.
In order to realize foregoing invention object, the present invention takes following technical scheme:
A kind of layer and section formula capacitive balance control method based on switching number is provided, said method comprising the steps of:
Step 1: gather and gather submodule work state information;
Step 2: the voltage of submodule is sorted;
Step 3: the submodule number of determining and issue each brachium pontis input;
Step 4: calculate the submodule number M that brachium pontis needs switching;
Step 5: select switching submodule.
In described step 1, brachium pontis segmentation control unit is transferred to brachium pontis by the submodule work state information of collection and gathers control unit and carry out gathering of submodule work state information.
Described submodule work state information comprises capacitance voltage and fault message.
In described step 2, brachium pontis gathers control unit the voltage of submodule is sorted according to principle from big to small.
In described step 3, circulation control unit is controlled by the utmost point voltage signal that protection system passes down and is nursed one's health into the number of levels that each brachium pontis produces, the submodule number that each brachium pontis drops into, and this submodule information of number is issued to brachium pontis gathers control unit.
In described step 4, brachium pontis gathers the number of levels that number of levels that control unit dropped into according to this brachium pontis and needs drop into, and adopts minimum approximatioss to calculate the submodule number M that brachium pontis needs switching.
In described step 5, according to the brachium pontis sense of current and module capacitance voltage ranking results, select switching submodule, wherein:
The positive bus-bar of take flows to negative busbar as positive direction, if now the sense of current, for just, is selected the less M of capacitance voltage in brachium pontis
1individual module drops into;
The negative busbar of take flows to positive bus-bar as negative direction, if now the sense of current, for negative, is selected the larger M of capacitance voltage in brachium pontis
2individual module drops into.
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.
Compared with prior art, beneficial effect of the present invention is:
1. the submodule switching number of take is distribution object, has guaranteed the flexibility of tactful operation, makes huge information processing obtain very facilitating simple and direct mode to complete, and has improved system reliability and processing speed;
2. by bases for estimation such as each segmentation Voltage Feedback, the senses of current, determine different switching submodules, system can be guaranteed under stable operation prerequisite, realize submodule capacitance voltage balance;
3. guarantee the reliable and stable operation of whole brachium pontis submodule in converter and with the coordinated of converter unit protection system;
4. the thinking that valve base controller has adopted layer and section to control is divided into brachium pontis controller that brachium pontis gathers control unit and brachium pontis segmentation control unit is two-layer, has solved large capacity MMC flexible DC power transmission current transformer and cannot adopt single control unit to complete the difficult problem that brachium pontis is controlled;
5. brachium pontis gathers control unit and is responsible for this brachium pontis and divides intersegmental capacitance voltage balance, and brachium pontis segmentation control unit is responsible for the submodule capacitance voltage balance in this segmentation, thereby has guaranteed the balance of voltage of whole brachium pontis;
6. brachium pontis gathers control unit by communicating by letter with each brachium pontis segmentation control unit in this brachium pontis, all submodule information is gathered, and antithetical phrase module voltage sorts, for to each submodule switching, thereby when switching, can realize the input of voltage height module and cut out control.
Accompanying drawing explanation
Fig. 1 is capacitive balance control structure figure in modularization multi-level converter.
Fig. 2 is the layer and section formula capacitive balance control structure figure based on switching number in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
At modularization multi-level converter (Module Multilevel Convertor, be called for short MMC converter), especially in large capacity converter, submodule quantity is huge, in control procedure, need to guarantee that the submodule voltage in each brachium pontis remains in the scope of a relative equilibrium, the many factors that this balance that relates to submodule capacitance voltage in brachium pontis need to be considered.For the greatly large capacity MMC converter of module number, level number is more, and control cycle is shorter in real time, and capacitance voltage balance is controlled more difficult realization; Meanwhile, limit by valve base control unit interface quantity, need to adopt layer and section processing mode to realize the independent control to each submodule valve base control appliance.Temporary location as valve base control appliance---brachium pontis gathers control unit, is the submodule information of the whole brachium pontis of a plurality of brachium pontis segmenting units is gathered, arranges, gathers the temporary location that bridge arm voltage equilibrium strategy is processed and brachium pontis Global Macros strategy is implemented.
The brachium pontis that the present invention is directed to valve base control appliance gathers control unit and has designed a kind of layer and section formula module capacitance balance of voltage control method that submodule switching number is target of take, guarantee the reliable and stable operation of whole brachium pontis submodule in converter and with the coordinated of converter unit protection system.
Modularization multi-level converter by 3 mutually totally 6 brachium pontis form, the submodule capacitance voltage balancing control algorithm the present invention relates to be the MMC converter valve base controller based on shown in Fig. 1, this valve base controller gathers control unit by 1 central valve base controller, 6 brachium pontis and some brachium pontis segmentation control units form.Each brachium pontis gathers control unit by the brachium pontis of 1 cover and several brachium pontis segmentation control units form, its bridge arm segmentation control unit completes the balance of voltage of the submodule of this brachium pontis segmentation and controls, and brachium pontis gathers control unit and completes the intersegmental balance of voltage control in each minute of this brachium pontis; 6 brachium pontis gather control unit and connect a central valve base controller, and this central valve base controller main frame has been responsible for 6 balances of voltage between brachium pontis and has been controlled.
As Fig. 2, MMC converter submodule capacitance voltage balance control method provided by the invention, concrete grammar is as follows:
1, brachium pontis segmentation control unit is by after connected submodule work state information acceptance and arranging, and the brachium pontis that is aggregated into this brachium pontis gathers control unit;
2, brachium pontis gather control unit then by this brachium pontis all the voltage of submodules according to sorting from big to small;
3, brachium pontis current control unit is controlled by the utmost point voltage signal that protection system PCP passes down and is nursed one's health into the number of levels that each brachium pontis produces, the submodule number that each brachium pontis drops into; And this information is issued to each brachium pontis gathers control unit;
4, brachium pontis gathers the number of levels that number of levels that control unit dropped into according to this brachium pontis and needs drop into, and calculates the submodule number M that this brachium pontis in this modulation needs switching;
5, when this brachium pontis sense of current is now for just (flowing to negative busbar for just by positive bus-bar), by the less M of capacitance voltage in this brachium pontis
1individual module drops into; When now the sense of current is for negative, valve base controller is counted M according to the submodule dropping into, by the larger M of voltage
2individual module drops into; By above way, make each brachium pontis submodule capacitance voltage of MMC current transformer keep balance.
Described brachium pontis segmentation control unit, brachium pontis gather the valve base control appliance VBC (Valve BaseController) 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.
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 modification 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 (1)
1. the layer and section formula capacitive balance control method based on switching number, is characterized in that: said method comprising the steps of:
Step 1: gather and gather submodule work state information;
In described step 1, brachium pontis segmentation control unit is transferred to brachium pontis by the submodule work state information of collection and gathers control unit and carry out gathering of submodule work state information;
Described submodule work state information comprises capacitance voltage and fault message;
Step 2: the voltage of submodule is sorted;
In described step 2, brachium pontis gathers control unit the voltage of submodule is sorted according to principle from big to small;
Step 3: the submodule number of determining and issue each brachium pontis input;
In described step 3, circulation control unit is controlled by the utmost point voltage signal that protection system passes down and is nursed one's health into the number of levels that each brachium pontis produces, the submodule number that each brachium pontis drops into, and this submodule information of number is issued to brachium pontis gathers control unit;
Step 4: calculate the submodule number M that brachium pontis needs switching;
In described step 4, brachium pontis gathers the number of levels that number of levels that control unit dropped into according to this brachium pontis and needs drop into, and adopts minimum approximatioss to calculate the submodule number M that brachium pontis needs switching;
Step 5: select switching submodule;
In described step 5, according to the brachium pontis sense of current and module capacitance voltage ranking results, select switching submodule, wherein:
The positive bus-bar of take flows to negative busbar as positive direction, if now the sense of current, for just, selects M1 the module that in brachium pontis, capacitance voltage is less to drop into;
The negative busbar of take flows to positive bus-bar as negative direction, if now the sense of current is for negative, selects M2 the module that in brachium pontis, capacitance voltage is larger to drop into;
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.
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Families Citing this family (6)
| 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 |
| 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 |
| CN105024574B (en) * | 2015-07-22 | 2017-09-08 | 上海交通大学 | The MMC submodule capacitor voltage balance control methods modulated suitable for phase-shifting carrier wave |
| 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 |
| CN109728740A (en) * | 2019-01-22 | 2019-05-07 | 哈尔滨工业大学 | Modularization multi-level converter circulation inhibition method based on decoupling principle |
| CN112072933A (en) * | 2020-08-06 | 2020-12-11 | 清华大学 | Voltage balance control method of unidirectional current type modular multilevel 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: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. 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: DALIAN POWER SUPPLY COMPANY OF LIAONING ELECTRIC POWER Co.,Ltd. Co-patentee before: State Grid Corporation of China |
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Effective date of registration: 20170531 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. 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: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. Co-patentee before: State Grid Corporation of China |