CN103066805A - 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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- 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 the flexible AC transmission technical field, be specifically related to a kind of capacitance voltage balance control method based on a plurality of submodule cluster switchings.
Background technology
Current, be applied to more and more the fields such as electric power system, locomotive traction, Aero-Space based on the various Power Electronic Circuit of all-controlling power electronics device IGBT.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 the 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, the flexible DC power transmission converter has substituted the Thyristors in series converter valve with the high-voltage commutation valve that is made of the IGBT series connection, has formed the flexible direct current converter of voltage-source type.Flexible DC power transmission can be realized powering to remote middle-size and small-size isolated, weak load; Can carry out independent, accurately, meritorious/Reactive Power Control flexibly, improve economy and the stability of system load flow transmission; Direct voltage polarity is constant when trend is reversed, and conveniently consists of the multi-terminal HVDC transmission system; When linking system short-circuit, do not increase the capacity of short circuit of system, be conducive to limiting short-circuit current, stop the fault pervasion of system; Reactive power support and FREQUENCY CONTROL can be provided, be used for the regenerative resources such as wind energy turbine set and the distributed power generation special advantage that is incorporated into the power networks; Behind the electric network fault that links, can provide the black power supply that starts, the fast restoration capabilities behind the quickening electric network fault; The 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 to put into relevant research and has put into practice in the work, its flexibly control performance also so that the control guard method of flexible direct current and control protective unit become the study hotspot of flexible direct current technology.In the control based on the flexible direct current of modularization multi-level converter topological structure, be very important link in the 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 a plurality of submodule cluster switchings, large capacity can be effectively solved based on the flexible DC power transmission converter valve control problem of modularization multi-level converter mode, the converter valve operation control ﹠ monitor of extensive quantity can be realized; By the binding mode, make rank of submodule quantity rank decline of modular multilevel converter valve, be conducive to the reduction of capacitance voltage balance control amount of calculation, reduced the requirement to control appliance.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
A kind of capacitance voltage balance control method based on a plurality of submodule cluster switchings is provided, said method comprising the steps of:
Step 1: upload and gather the submodule state;
Step 2: M the submodule that brachium pontis is comprised 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 clear and definite current total submodule number that need to drop into, and then needing this moment to obtain the number m ' of the module group that drops 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 the described step 1, brachium pontis segmentation control unit is uploaded to brachium pontis with the submodule state and gathers control unit, and described brachium pontis gathers control unit the submodule state that receives is gathered.
In the 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 from big to small principle.
In the described step 3, adopt total submodule number of the clear and definite current needs input of minimum approximatioss according to the instruction that the upper strata DC control and protection system issues, and then needing at this moment to obtain the number m ' of the module group of input.
Described step 4 may further comprise the steps:
Step 3-1: flow to negative busbar as positive direction take positive bus-bar, if the sense of current is selected voltage and minimum m for just at this moment
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 take negative busbar, if this moment, the sense of current was negative, select 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 with the 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. large capacity can be effectively solved based on the flexible DC power transmission converter valve control problem of modularization multi-level converter mode, the converter valve operation control ﹠ monitor of extensive quantity can be realized;
2. this patent makes rank of submodule quantity rank decline of modular multilevel converter valve by the binding mode, is conducive to the reduction of capacitance voltage balance control amount of calculation, has reduced the requirement to control appliance;
3. submodule is tied to after the module group, whole switching, and utilize the 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.
Description of drawings
Fig. 1 is based on the capacitance voltage balance control topology diagram of a plurality of 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 the MMC converter) be composed in series by a plurality of 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 the layer and section processing mode that each submodule is controlled separately, temporary location as the valve base control appliance---brachium pontis gathers the unit, is that the submodule information with the whole brachium pontis of a plurality of brachium pontis segmenting units gathers, arrangement, gather the temporary location that the 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 cross-talk module information of brachium pontis is gathered, puts in order, realizes the bottom control unit that brachium pontis Segmented electrical pressure balanced strategy is processed and brachium pontis sectionalised protection strategy is implemented.
Such as Fig. 1, modularization multi-level converter by 3 mutually totally 6 brachium pontis form the capacitance voltage equilibrium strategy that is based on the modularization multi-level converter valve of the balance that the present invention relates to control.The capacitance voltage equilibrium strategy gathers the control unit controller by brachium pontis segmentation control unit and brachium pontis and jointly finishes; its bridge arm segmentation control unit be responsible for finishing and converter valve between communication; be responsible for collecting submodule capacitance voltage and running status; withdraw from and other protection controls to submodule transmission submodule input; each brachium pontis segmentation controller charge of overseeing submodule state; brachium pontis gathers control unit and is responsible for that each state of uploading gathers with brachium pontis, is responsible for simultaneously finishing the balance control of the whole submodule capacitance voltage of brachium pontis.
Brachium pontis gathers control unit to be responsible for the submodule state that brachium pontis segmentation control unit is uploaded is gathered, and submodule divided into groups, a brachium pontis comprises 540 modules, per 9 modules are bundled into a module group, brachium pontis will comprise 60 module groups altogether, brachium pontis gathers control unit will carry out whole 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 the capacitance voltage balance.Submodule voltage in the module group is owing to the voltage adaptive balance, and module voltage will be consistent.According to above description, each module group be numbered N, the voltage of module group for the voltage of n module in the group and, the brachium pontis segmentation is fixing voltage addition in each group, then with voltage be uploaded to brachium pontis and gather the unit.
Brachium pontis gathers control unit according to voltage request, calculates the module group that needs to drop into and counts 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 ordering situation, the module group that selection will drop into.If this moment, the sense of current was when just (flowing to negative busbar for just by positive bus-bar), select the m of voltage and minimum
1' individual submodule group drops into remaining 60-m
1' individual submodule cuts out.If when this moment, the sense of current was 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 the 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.When occurring the voltage inequality in the module group between the submodule, the submodule that capacitance voltage is higher is larger by the electric current of grading resistor, and discharge is very fast; The submodule that capacitance voltage is lower is less by the electric current of grading resistor, and it is slower to discharge.Therefore, when causing that owing to submodule difference submodule voltage is uneven in the module group, grading resistor can play the effect of electric voltage equalization in the adjustment module group.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. capacitance voltage balance control method based on a plurality of submodule cluster switchings is characterized in that: said method comprising the steps of:
Step 1: upload and gather the submodule state;
Step 2: M the submodule that brachium pontis is comprised 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 clear and definite current total submodule number that need to drop into, and then needing this moment to obtain the number m ' of the module group that drops 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.
2. the capacitance voltage balance control method based on a plurality of submodule cluster switchings according to claim 1, it is characterized in that: in the described step 1, brachium pontis segmentation control unit is uploaded to brachium pontis with the submodule state and gathers control unit, and described brachium pontis gathers control unit the submodule state that receives is gathered.
3. the capacitance voltage balance control method based on a plurality of submodule cluster switchings according to claim 1, it is characterized in that: in the 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 a plurality of submodule cluster switchings according to claim 1 is characterized in that: described brachium pontis gathers control unit the voltage of m module group is sorted according to from big to small principle.
5. the capacitance voltage balance control method based on a plurality of submodule cluster switchings according to claim 1; it is characterized in that: in the described step 3; adopt total submodule number of the clear and definite current needs input of minimum approximatioss according to the instruction that the upper strata DC control and protection system issues, and then needing at this moment to obtain the number m ' of the module group of input.
6. the capacitance voltage balance control method based on a plurality of submodule cluster switchings according to claim 1, it is characterized in that: described step 4 may further comprise the steps:
Step 3-1: flow to negative busbar as positive direction take positive bus-bar, if the sense of current is selected voltage and minimum m for just at this moment
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 take negative busbar, if this moment, the sense of current was negative, select voltage and maximum m
2' individual submodule group drops into remaining m-m
2' individual submodule group cuts out.
7. the capacitance voltage balance control method based on a plurality of 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 with the 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103368197A (en) * | 2013-07-15 | 2013-10-23 | 国网智能电网研究院 | Valve base control device and method of modularization multi-level converter |
| CN103490599A (en) * | 2013-09-16 | 2014-01-01 | 电子科技大学 | Power tube subsection grid driving circuit |
| CN103929081A (en) * | 2014-04-14 | 2014-07-16 | 中国西电电气股份有限公司 | Sub-module voltage equalizing method for modularization multi-level current converter |
| CN104038060A (en) * | 2014-06-03 | 2014-09-10 | 中国科学院电工研究所 | Method for voltage equalization of modularized multi-level converter for flexible direct current transmission system |
| CN104038052A (en) * | 2014-06-23 | 2014-09-10 | 上海交通大学 | Quick voltage balance control method for modular multilevel converter |
| CN104135177A (en) * | 2014-07-24 | 2014-11-05 | 华北电力大学 | Voltage balancing control method applicable for sub-module capacitor voltage hierarchy of high-level MMC (Modular Multilevel Converter) |
| CN104767178A (en) * | 2015-04-16 | 2015-07-08 | 北京荣信慧科科技有限公司 | Protection and control system and control method based on bridge arm unit |
| CN104836457A (en) * | 2014-02-11 | 2015-08-12 | 华北电力大学 | Capacitance-voltage grouping balance optimization algorithm for modularized multi-level transverter |
| CN106483841A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of field adjustable and the method for test circulation suppression strategy parameter |
| CN107968587A (en) * | 2017-11-06 | 2018-04-27 | 上海交通大学 | The assist exchanging circuit device and control method of mixed type sea wind field DC converter |
| CN112865162A (en) * | 2021-01-15 | 2021-05-28 | 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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| 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 |
| EP3024109A4 (en) * | 2013-07-15 | 2017-05-03 | State Grid Corporation of China (SGCC) | Valve base control device and method for modular multi-level convertor |
| EP3024109A1 (en) * | 2013-07-15 | 2016-05-25 | State Grid Corporation of China (SGCC) | Valve base control device and method for modular multi-level convertor |
| WO2015007186A1 (en) * | 2013-07-15 | 2015-01-22 | 国家电网公司 | Valve base control device and method for modular multi-level convertor |
| CN103368197A (en) * | 2013-07-15 | 2013-10-23 | 国网智能电网研究院 | Valve base control device and method of modularization multi-level converter |
| CN103490599A (en) * | 2013-09-16 | 2014-01-01 | 电子科技大学 | Power tube subsection grid driving circuit |
| CN104836457A (en) * | 2014-02-11 | 2015-08-12 | 华北电力大学 | Capacitance-voltage grouping balance optimization algorithm for modularized multi-level transverter |
| 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 |
| CN103929081A (en) * | 2014-04-14 | 2014-07-16 | 中国西电电气股份有限公司 | Sub-module voltage equalizing method for modularization multi-level current converter |
| CN104038060A (en) * | 2014-06-03 | 2014-09-10 | 中国科学院电工研究所 | Method for voltage equalization of modularized multi-level converter for flexible direct current transmission system |
| 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 |
| CN104038052A (en) * | 2014-06-23 | 2014-09-10 | 上海交通大学 | Quick voltage balance control method for modular multilevel converter |
| CN104038052B (en) * | 2014-06-23 | 2016-07-06 | 上海交通大学 | Modularization multi-level converter voltage balance control method |
| CN104135177A (en) * | 2014-07-24 | 2014-11-05 | 华北电力大学 | Voltage balancing control method applicable for sub-module capacitor voltage hierarchy of high-level MMC (Modular Multilevel Converter) |
| 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 |
| CN104767178A (en) * | 2015-04-16 | 2015-07-08 | 北京荣信慧科科技有限公司 | Protection and control system and control method based on bridge arm unit |
| 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 |
| CN106483841A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of field adjustable and the method for test circulation suppression strategy parameter |
| 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 |
| CN107968587A (en) * | 2017-11-06 | 2018-04-27 | 上海交通大学 | The assist exchanging circuit device and control method of mixed type sea wind field DC converter |
| CN112865162A (en) * | 2021-01-15 | 2021-05-28 | 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 |
| 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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