CN102253247B - Flexibly-expanded general experiment platform for modular multi-level current converter - Google Patents
Flexibly-expanded general experiment platform for modular multi-level current converter Download PDFInfo
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- CN102253247B CN102253247B CN201110169229.4A CN201110169229A CN102253247B CN 102253247 B CN102253247 B CN 102253247B CN 201110169229 A CN201110169229 A CN 201110169229A CN 102253247 B CN102253247 B CN 102253247B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 31
- 239000000725 suspension Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000004088 simulation Methods 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000009897 systematic effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 6
- 208000035126 Facies Diseases 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
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- 238000013459 approach Methods 0.000 description 1
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a flexibly-expanded general experiment platform for a modular multi-level current converter. The platform comprises a current conversion side I and a current conversion side II which are symmetrically arranged, wherein the current conversion side I comprises a switch cabinet, a voltage regulator, a transformer, an analogue reactor and a current converter cabinet which are sequentially connected; the current conversion side II comprises a switch cabinet, a voltage regulator, a transformer, an analogue reactor and a current converter cabinet which are sequentially connected; and the current conversion side I and the current conversion side II are connected through a lead. The invention provides an experiment platform for theoretical research and engineering simulation for a flexible direct-current transmission system/static reactive compensation device using the modular multi-level current converter, and meets the needs for the engineering simulation tests of different scales and different levels; moreover, the boosting as well as capacity expansion of the experiment platform can be finished by changing a reference value of a control system and increasing the number of sub-modules in serial connection without adding equipment; and the general experiment platform has the characteristic of strong expandability, and saves the floor space and investment of equipment.
Description
Technical field:
The present invention relates to field of power electronics, be specifically related to a kind of can the Experiment Platform of modularization multi-level converter of flexible expansion.
Background technology:
Modularization multi-level converter is a kind of brand-new transverter being applicable to high pressure flexible direct current technical field of electric power transmission risen recent years, the situation in original two exclusive flexible direct current markets of level topology has been broken in its appearance, adds the possibility of flexible direct current application.
Each brachium pontis of modular multilevel all has the submodule of equal number and brachium pontis reactance to be in series, by controlling the input of submodule and exiting, output ground voltage is made to approach sinusoidal voltage, thus form stable working point, simultaneously, dropped into the complementation of electric capacity by same facies unit upper and lower bridge arm, form galvanic current pressure, so just achieve the stable operation of system.
A modularization multi-level converter is composed in parallel by three facies units, and each facies unit is divided into upper and lower two brachium pontis; The side of brachium pontis is connected to ac output end, and opposite side is connected to DC output end; Each brachium pontis is in series by the submodule of equal number and brachium pontis reactance, and brachium pontis reactance can be concentrated and is connected between converter valve and ac output end, also can disperse to connect with submodule.The structure of submodule is formed by simple half-bridge structure and Capacitance parallel connection, is composed in parallel in other words by the concatermer of two-way electronic power switch opened electronic power switch identical with another and electric capacity.All submodule cascaded structures are called valve.
This modularization multi-level converter both can be applied in the static synchronous compensating device of mesolow, in the static synchronous compensating device that also can be applied in high pressure and flexible direct current power transmission system, along with the upgrading of switching device and the progress of direct current cables technology, be also likely applied to the UHV (ultra-high voltage) even flexible direct-current transmission field of extra-high voltage in the future.
The appearance of new technology is in the urgent need to a large amount of experimental studies, and the wide application of flexible DC power transmission determines the variation of Practical Project, transmission system (containing static synchronous compensating device) has the actual market demand from Small And Medium Capacity to high-voltage large-capacity.Therefore the modularization multi-level converter experiment porch determining constant-voltage capacity can not meet theory and the experimental study of all application scenarios, has certain limitation.
For in the experimental study of modularization multi-level converter, a lot of researchist have developed the model machine of modularization multi-level converter, 2MW/17 level model machine (the Power Flectronics SpecialistsConference of the National Defence University as federal in Munich, Germany development, 2004,2572 ~ 2576); The 6kV/6MVA model machine (35th AnnualConference of IEEE on Industrial Flectronics, 2009,225 ~ 230) of Dresden university of Germany development; Tsing-Hua University development 650V/20kVA model machine (Liu Zhongqi. the HVDC light system based on modular multi-level converter is studied [D]. Beijing: Tsing-Hua University, 2010.).The common feature of above model machine is only can analog module multilevel converter, can not analog DC transmission system, more can not upgrade flexibly, obtain for different engineerings and reasonably simulate ratio, and for the scientific research institutions such as colleges and universities, it is unrealistic also uneconomic for building an experiment porch for each application.
Summary of the invention:
For the deficiencies in the prior art, the object of the present invention is to provide a kind of can the Experiment Platform of modularization multi-level converter of flexible expansion, both can meet the needs of different scales and the test of varying level number engineering simulation, can science research input have been saved again.
Provided by the invention a kind of can the Experiment Platform of modularization multi-level converter of flexible expansion, its improvements are, described platform comprises symmetrically arranged change of current side I and change of current side II;
Described change of current side I comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Described change of current side II comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Described change of current side I is connected by wire with described change of current side II.
The Experiment Platform of the first preferred version provided by the invention, its improvements are, described change of current side I includes with the described switch cubicle of the described change of current side II high-speed switch I, fuse and the switching-on resistance that are connected successively.
The Experiment Platform of the second preferred version provided by the invention, its improvements are, described change of current side I is connected with switch board respectively with the described current converter cabinet of described change of current side II.
The Experiment Platform of the 3rd preferred version provided by the invention, its improvements are, are equipped with AC system equivalent reactance and points of common connection between the described pressure regulator of described change of current side I and described change of current side II and described transformer;
Equivalent alternating current circuit is provided with between the described points of common connection of described change of current side I and described change of current side II;
The described points of common connection of described change of current side II is connected with resistance sense load.
The Experiment Platform of the 4th preferred version provided by the invention, its improvements are, all arrange interchange service entrance switch between the described emulating reactance device of described change of current side I and described change of current side II and described current converter cabinet; Described interchange service entrance switch and described current converter cabinet brachium pontis arrange fuse.
The Experiment Platform of the 5th preferred version provided by the invention, its improvements are, described current converter cabinet is drawer type, and the submodule of described transverter can pull.
The Experiment Platform of the 6th preferred version provided by the invention, its improvements are, described emulating reactance device is variable reactor.
The Experiment Platform of the 7th preferred version provided by the invention, its improvements are, install roller bottom described switch cubicle;
Described pressure regulator, described transformer, described emulating reactance device and described current converter cabinet top are established and are separately installed with suspension ring.
The Experiment Platform of more preferably scheme provided by the invention, its improvements are, described switch cubicle comprises high-speed switch II, and described high-speed switch II is in parallel with described switching-on resistance.
The Experiment Platform of another preferred version provided by the invention, its improvements are, described switch board comprises VBC valve control module, current decoupled control module, Reactive Power Control module, active power controller module, alternating voltage control module and DC voltage control module;
Described transverter, described VBC valve control module are connected successively with described current decoupled control module; Described current decoupled control module is connected with described DC voltage control module with described Reactive Power Control module, described active power controller module, described alternating voltage control module more respectively.
Compared with the prior art, beneficial effect of the present invention is:
Flexible direct current power transmission system/static passive compensation device that the present invention is application module multilevel converter provides the experiment porch needed for theoretical research and engineering simulation;
The present invention meets the needs of different scales and the test of varying level number engineering simulation;
The present invention does not increase equipment, only increases sub-series number of modules, and change control system reference value can complete the boosting dilatation of experiment porch, and major equipment is all detachable and removable.
Experiment porch extensibility of the present invention is strong, saves floor area and the investment of equipment.
Accompanying drawing explanation
Fig. 1 is modular multilevel converter structure figure provided by the invention;
Fig. 2 is Experiment Platform layout provided by the invention;
Fig. 3 is Experiment Platform structural drawing provided by the invention;
Fig. 4 is the low pressure control prototype structural drawing of modularization multi-level converter provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is modular multilevel converter structure figure.A modularization multi-level converter is made up of three-phase six brachium pontis, and each facies unit is divided into upper and lower two brachium pontis; The side of brachium pontis is connected to ac output end, and opposite side is connected to DC output end; Each brachium pontis is in series by the submodule of equal number and brachium pontis reactance, and brachium pontis reactance can be concentrated and is connected between converter valve and ac output end, also can disperse to connect with submodule.The change of current side I of the present embodiment and between the emulating reactance device of change of current side II and current converter cabinet, interchange service entrance switch is all set; Interchange service entrance switch and current converter cabinet brachium pontis arrange fuse.Current converter cabinet current converter cabinet is drawer type, and each submodule all can pull; Increase level number and only need the submodule number directly increasing cascade, do not need to change sub-module assemblies.
The Experiment Platform layout of the present embodiment as shown in Figure 2, comprises symmetrically arranged change of current side I and change of current side II;
Change of current side I comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Change of current side II comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Change of current side I is connected by wire with described change of current side II.Wherein, emulating reactance device is variable reactor.
On this, its concrete structural drawing as shown in Figure 3.
Change of current side I includes with the switch cubicle of the change of current side II high-speed switch I, fuse, the switching-on resistance that are connected successively.Switch cubicle also comprises high-speed switch II, and described high-speed switch II is in parallel with described switching-on resistance, and installs roller bottom switch cubicle, and installation suspension ring are established at pressure regulator, transformer, emulating reactance device, load cabinet and current converter cabinet top.
The equal connection control cabinet of current converter cabinet of change of current side I and change of current side II.Switch board comprises VBC valve control module, current decoupled control module, Reactive Power Control module, active power controller module, alternating voltage control module, DC voltage control module; Transverter connects VBC valve control module and current decoupled control module; Current decoupled control module is connected with DC voltage control module with Reactive Power Control module, active power controller module, alternating voltage control module more respectively.
AC system equivalent reactance and points of common connection is equipped with between the described pressure regulator of described change of current side I and described change of current side II and described transformer;
Equivalent alternating current circuit is provided with between the described points of common connection of described change of current side I and described change of current side II;
The described points of common connection of described change of current side II is connected with resistance sense load.Resistance sense load is the load connected outside this test unit.
Fig. 4 is the low pressure control prototype structural drawing of modularization multi-level converter.
The equal connection control cabinet of current converter cabinet of change of current side I and change of current side II.Switch board comprises VBC valve control module, current decoupled control module, Reactive Power Control module, active power controller module, alternating voltage control module and DC voltage control module; Transverter successively with VBC valve control module and current decoupled control model calling; Current decoupled control module is connected with DC voltage control module with Reactive Power Control module, active power controller module, alternating voltage control module more respectively.
Reactive power sensor, active power sensor and voltage table are set between pressure regulator and transformer.User can select active power controller, Reactive Power Control, DC voltage control and alternating voltage to control.For Reactive Power Control and DC voltage control: reactive power sensor reactive power detection value signal and setting value are sued for peace after by Reactive Power Control, change in circular current q axle component; The DC voltage that transverter exports by voltage table and setting value sue for peace after through DC voltage control, change in circular current d axle component; Iq with id exported obtains the decoupling zero voltage exchanged through inner ring current decoupled control, give VBC valve control module, signal is passed to transverter by VBC valve control module again, controls transverter.
If when increasing transverter level number, transformer voltage ratio is constant, pressure regulator output voltage increases, and output current is constant, and when output voltage reaches 430V, system dc voltage reaches the upper limit, and transverter level number also reaches the upper limit.Then according to aforesaid operations method, the experimental system result under different electric pressure is obtained.
Finally should be noted that: only illustrate that technical scheme of the present invention is not intended to limit in conjunction with above-described embodiment.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify to the specific embodiment of the present invention or equivalent replacement, but these amendments or change are all being applied among the claims awaited the reply.
Claims (5)
1. can the Experiment Platform of modularization multi-level converter of flexible expansion, it is characterized in that, described platform comprises symmetrically arranged change of current side I and change of current side II;
Described change of current side I comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Described change of current side II comprises the switch cubicle, pressure regulator, transformer, emulating reactance device and the current converter cabinet that are connected successively;
Described change of current side I is connected by wire with described change of current side II;
Described change of current side I includes with the described switch cubicle of the described change of current side II high-speed switch I, fuse and the switching-on resistance that are connected successively; Described current converter cabinet is drawer type, and the submodule of described current converter cabinet can pull; Described change of current side I is connected with the switch board of respective side respectively with the described current converter cabinet of described change of current side II; Described emulating reactance device is variable reactor; The switch board of described change of current side I and the switch board of described change of current side I include VBC valve control module, current decoupled control module, Reactive Power Control module, active power controller module, alternating voltage control module and DC voltage control module;
Described transverter, described VBC valve control module are connected successively with described current decoupled control module; Described current decoupled control module is connected with described DC voltage control module with described Reactive Power Control module, described active power controller module, described alternating voltage control module more respectively.
2. Experiment Platform as claimed in claim 1, is characterized in that, be equipped with AC system equivalent reactance and points of common connection between the described pressure regulator of described change of current side I and described change of current side II and described transformer;
Equivalent switched line is provided with between the affiliated points of common connection of described change of current side I and described change of current side II;
The described points of common connection of described change of current side II is connected with resistance sense load.
3. Experiment Platform as claimed in claim 1, is characterized in that, all arrange interchange service entrance switch between the described emulating reactance device of described change of current side I and described change of current side II and described current converter cabinet; Described interchange service entrance switch and described current converter cabinet brachium pontis arrange fuse.
4. Experiment Platform as claimed in claim 1, is characterized in that, install roller bottom described switch cubicle;
Described pressure regulator, described transformer, described emulating reactance device and described current converter cabinet top are established and are separately installed with suspension ring.
5. Experiment Platform as claimed in claim 1, it is characterized in that, the switch cubicle of described change of current side I and the switch cubicle of change of current side II include high-speed switch II, and described high-speed switch II is in parallel with described switching-on resistance.
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| CN102928699B (en) * | 2012-05-28 | 2015-03-04 | 清华大学 | Converter synchronization experiment system and method |
| CN104422838B (en) * | 2013-09-10 | 2017-12-22 | 南京南瑞继保电气有限公司 | A kind of electric and electronic power module test runtime |
| CN104764943B (en) * | 2014-01-03 | 2018-01-19 | 国家电网公司 | A kind of Modular multilevel converter single-phase inversion hookup and its test method |
| CN105204482B (en) * | 2015-10-31 | 2018-02-16 | 南京南瑞继保电气有限公司 | Suitable for the cascade connection type communication construction of modularization multi-level converter control system |
| CN108073085A (en) * | 2016-11-10 | 2018-05-25 | 中电普瑞科技有限公司 | A kind of VSC valves control procedure simulation test method |
| CN108364549B (en) * | 2017-01-25 | 2024-04-16 | 深圳青铜剑科技股份有限公司 | Power conversion integrated system for scientific research and teaching |
| CN110716467B (en) * | 2019-10-16 | 2021-03-30 | 南京南瑞继保电气有限公司 | Communication method and control system |
| CN111665411B (en) * | 2020-07-01 | 2023-08-11 | 浙江大学 | Modularized multifunctional MMC topology universal experimental platform and method thereof |
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