CN202798507U - DC ice melting device based on full-bridge modular multi-level converter - Google Patents
DC ice melting device based on full-bridge modular multi-level converter Download PDFInfo
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- CN202798507U CN202798507U CN201220301276XU CN201220301276U CN202798507U CN 202798507 U CN202798507 U CN 202798507U CN 201220301276X U CN201220301276X U CN 201220301276XU CN 201220301276 U CN201220301276 U CN 201220301276U CN 202798507 U CN202798507 U CN 202798507U
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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- Engineering & Computer Science (AREA)
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Abstract
The utility model discloses a DC (Direct Current) ice melting device based on a full-bridge modular multi-level converter; wherein the full-bridge modular multi-level converter has a three-phase bridge structure, each phase of the converter comprises an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm respectively consist of N full-bridge power modules which are connected in series in a head-to-tail way, so as to form a chain type multi-level structure, head ends of first power modules of the upper bridge arms of the various phases are connected together to form a positive electrode of a common DC bus, tail ends of N-th power modules of the lower bridge arms of the various phases are connected together to form a negative electrode of the common DC bus; a tail end of an N-th power module of the upper bridge arm of the each phase and a head end of a first power module of the lower bridge arm of the phase are connected together through a smoothing reactor, a middle point of the reactor is used as an AC (Alternating Current) bus of the phase. On one hand, the DC ice melting device of the utility model has a high-voltage DC output capability, wherein a DC voltage can be adjusted continuously from zero, on the other hand, the DC ice melting device is completely compatible with a chain type SVG (Static Var Generator) topology, and can realize quick dynamic var adjustment, therefore, the DC ice melting device of the utility model simultaneously has the functions of DC ice melting and AC dynamic var compensation.
Description
Technical field
The utility model belongs to the electronic power convertor technical field, is specifically related to a kind of electrical network DC de-icing device.
Background technology
In recent years, south China extreme sleety weather in area winter takes place frequently, and DC de-icing device begins extensive use in electric power system.Traditional DC de-icing device adopts the thyristor rectifier technology, by phase control rectifier alternating current is transformed to the adjustable direct current of amplitude and is used for removing ice of power transmission line.Because deicing device only just can use under the extreme weather conditions in the winter time, thereby the utilization rate of equipment and installations of device is lower, has brought extra burden for power transmission and distribution enterprise.
For improving the utilization rate of equipment and installations of deicing device, combining with Static Var Compensator (SVC) becomes the mainstream technology of DC de-icing device.On the one hand, SVC and DC de-icing device all adopt the Thyristor Controlled technology, and used main element is identical, only need to carry out to the topological structure of main circuit the function that certain conversion just can realize respectively DC ice melting and reactive power compensation; On the other hand, the transformer station of electrical power trans mission/distribution system generally all needs to dispose the reactive power compensator of certain capacity, and with the convenient line voltage of regulating, SVC can satisfy this application demand just.
But, find when the SVC thyristor rectifier device is used for DC ice melting, to have that volume is large, harmonic pollution serious and topology is switched the problems such as complicated through in a few years actual motion.During in particular as portable deicing device, although install by the container mode, container, rectifier transformer are bulky, and transportation is inconvenience very; Complicated with the timer wiring, between reactive power compensation and ice-melt function, switch, need just can finish through a plurality of switching manipulations the conversion of topological structure, greatly weakened the needed installation of portable deicing device simply, the characteristics that put into operation fast.
Along with the development of power electronic technology, there is the scholar to propose in the literature the thinking that chain type SVG is combined with DC de-icing device, on the one hand, combine with reactive power compensator of future generation, improve the performance of device compensation dynamic reactive; On the other hand, introduce the full-control type device and be conducive to solve the ubiquitous harmonic problem of Thyristor Controlled rectifier.But because the total module direct voltage of this chain structure suspends separately, do not have public dc bus, thereby can't be directly used in the middle of the DC ice melting, there is not yet the bibliographical information of related art scheme at present yet.In addition, also there is the scholar to propose to carry out DC ice melting by the many level of half-bridge moduleization (HBMMC) scheme of HVDC Light (HVDCLight), HVDC Light has common DC bus, the condition that possesses natively high direct voltage output, its AC connects electrical network simultaneously, also possesses the dynamic passive compensation ability.But, utilize the ice-melt of HVDC Light technology also to have some limitation, wherein outstanding is exactly that the adjustable extent of HBMMC output dc voltage is little, must more than the direct voltage that satisfies the controlled rectification condition, regulate, the transmission line that can't effectively adapt to different length, thereby the availability factor of device will be had a greatly reduced quality.
The utility model content
The utility model is for the deficiency of existing DC de-icing device, a kind of modular multi-level converter that adopts the full-bridge module is proposed, form the AC/DC current transformer topological project with common DC bus by the cascade of H bridge, this scheme possesses the high voltage direct current fan-out capability on the one hand, and direct voltage can be started from scratch and be regulated continuously, complete compatible chain type SVG topology can realize that dynamic reactive is regulated fast, thereby possess simultaneously DC ice melting and exchange dynamic no-power compensation function on the other hand.
The utility model proposes a kind of DC de-icing device based on the full-bridge modular multi-level converter, it is characterized in that: described full-bridge modular multi-level converter is the three-phase bridge structure, each of current transformer comprises a upper brachium pontis and a lower brachium pontis mutually, upper and lower brachium pontis is composed in series from beginning to end by N full bridge power module respectively, form many level of chain type structure, and each brachium pontis be respectively from top to bottom the 1st, the 2nd ..., a N power model.Each head end of going up mutually the 1st power model of brachium pontis links together, and forms the anodal UDC+ of common DC bus, and each descends the end of N power model of brachium pontis to link together mutually, forms the negative pole UDC-of common DC bus.Each end of going up mutually N power model of brachium pontis descends the head end of the 1st power model of brachium pontis respectively to link together by a smoothing reactor with this mutually, and the tie point of two reactors connects the ac bus of this phase.Full bridge power module described in the utility model is the H bridge construction, consisted of by four turn-off device Q1 ~ Q4 and direct current support capacitor C, the collector electrode that it is characterized in that turn-off device Q1 and Q3 links to each other with the positive pole of direct current support capacitor C, and the emitter of turn-off device Q2 and Q4 links to each other with the negative pole of direct current support capacitor C; The emitter of turn-off device Q1 links to each other with the collector electrode of turn-off device Q2, forms the head end M1 of full bridge power module, and the emitter of turn-off device Q3 links to each other with the collector electrode of turn-off device Q4, forms the terminal M 2 of full bridge power module.
The positive pole of described common DC bus and the negative pole of common DC bus are applied to respectively on the corresponding DC ice-melting.
The DC de-icing device based on the full-bridge modular multi-level converter that the utility model proposes, it is characterized in that the needed direct voltage Udc of DC side ice-melt and the AC needed ac phase voltage uac that is incorporated into the power networks is averagely allocated to each full bridge power module, namely in the output voltage of each power model, DC component is Udc/2N, and alternating current component is uac/N.The utility model takes full advantage of the bipolarity output characteristic of full-bridge module, each power model can both be exported adjustable direct voltage, thereby make whole converter device possess the ability of the continuously adjustable direct voltage of output, farthest satisfy the ice-melt requirement of different line parameter circuit values and line length.
The full-bridge modular multi-level converter that the utility model proposes adopts turn-off device to substitute traditional thyristor device, rectifier transformer and the passive filter group of huge heaviness in traditional DC de-icing device have been saved, and when between DC ice melting function and dynamic no-power compensation function, switching, the device main circuit topological structure does not change, thereby has the outstanding advantages such as volume is little, loss is low, harmonic wave is little, easy and simple to handle; Not only solved simultaneously the problem that direct voltage that the HBMMC structure faces can't be regulated on a large scale, and no-power compensation function that can complete compatible chain type SVG, using for DC ice melting provides a kind of brand-new solution.
Description of drawings
Fig. 1 is based on the DC de-icing device of full-bridge modular multi-level converter;
Fig. 2 H bridge power model topology diagram;
Fig. 3 DC de-icing device 1-1 mode of connection;
Fig. 4 DC de-icing device 1-2 mode of connection;
The output current wave of Fig. 5 upper and lower bridge arm power model under ice-melt mode;
Fig. 6 deicing device output dc voltage gamut adjustment process schematic diagram.
Embodiment
Be described in detail below in conjunction with know-why and the embodiment based on the DC de-icing device of full-bridge modular multi-level converter of accompanying drawing to the utility model design.
The DC de-icing device topological structure of the full-bridge modular multilevel structure that the utility model is designed as shown in Figure 1.Described full-bridge modular multi-level converter is the three-phase bridge structure, each of current transformer comprises a upper brachium pontis and a lower brachium pontis mutually, upper and lower brachium pontis is composed in series from beginning to end by N full bridge power module respectively, form many level of chain type structure, and each brachium pontis be respectively from top to bottom the 1st, the 2nd ..., a N full bridge power module, wherein N is the integer greater than 1; Each head end of going up mutually the 1st power model of brachium pontis links together, and forms the positive pole of common DC bus, and each descends the end of N power model of brachium pontis to link together mutually, forms the negative pole of common DC bus; Each end of going up mutually N power model of brachium pontis descends the head end of the 1st power model of brachium pontis to link together by a smoothing reactor with this mutually, and the mid point of reactor is as the ac bus of this phase.
In accompanying drawing 1, left side DC+, DC-are dc bus, and being connected to needs the transmission line of ice-melt two ends; Right side ua, ub, uc are ac bus, connect AC network, the topological structure of described H bridge power model as shown in Figure 2, the full bridge power module is the H bridge construction, consisted of by four turn-off device Q1 ~ Q4 and direct current support capacitor C, the collector electrode that it is characterized in that turn-off device Q1 and Q3 links to each other with the positive pole of direct current support capacitor C, and the emitter of turn-off device Q2 and Q4 links to each other with the negative pole of direct current support capacitor C; The emitter of turn-off device Q1 links to each other with the collector electrode of turn-off device Q2, forms the head end M1 of full bridge power module, and the emitter of turn-off device Q3 links to each other with the collector electrode of turn-off device Q4, forms the terminal M 2 of full bridge power module.
From accompanying drawing 1, can see, described full-bridge modular multi-level converter adopts and the common consistent module cascaded structure of chain type SVG, its general structure is equivalent to the chain type SVG parallel running that two Y types connect, and difference is the common port of each SVG is drawn as common DC bus.
When described full-bridge modular multi-level converter moves as DC de-icing device, AC runs on the PWM rectification state by many level of chain type topology, active power flows to device from AC network, and the alternating current of utilization input charges to the dc capacitor of each power model; Each power model is exported required direct voltage by the PWM modulation technique simultaneously, through after the overlapped in series, forms high voltage direct current output voltage U
DC, U
DCBe applied to the circuit two ends and just obtain needed ice melting current.From DC side, device output dc voltage and direct current, the AC power that each power model flows into is converted into direct current power and is discharged on the DC ice-melting.By the coordination control of AC and DC side, so that the ac input power of each power model and dc output power are equal, thereby the voltage of the DC support electric capacity of guaranteed output module remains stable just.Under the DC ice melting pattern, the mode of connection of deicing device and alternating current circuit is as shown in accompanying drawing 3,4.
When described full-bridge modular multi-level converter moves as dynamic reactive compensation device, because topological structure is highly consistent with chain type SVG, AC still connects AC network, direct current outlet side even need not to disconnect and can be directly switch to idle control model.AC still works in the PWM rectification state, absorbs very little active power to keep the voltage stabilization of module DC support electric capacity from electrical network, and DC side is by reducing modulation ratio with the output voltage U of dc bus simultaneously
DCBe reduced to zero.Whole handoff procedure is finished automatically by software control, need not to carry out hardware topology and changes, and has reduced probability of malfunction, has improved the device global reliability.
In the embodiment of the present utility model, for typical 110kV Transmission Line Design DC de-icing device, typical 110kV transformer station separate unit main transformer capacity is 40MVA, and line length is 50km, and transformer station's outlet is LGJ-185.According to Soviet Union's boolean Ge Sidaoerfu formula under representative condition (5 ℃, wind speed 5m/s, ice covering thickness 10mm, 1h ice-melt) result of calculation, the typical minimum ice melting current of LGJ-185 type wire is 515A, and the minimal power capacity that the 50km circuit needs is about 4.5MW.Because calculate according to the target of the effective ice-melt of 60min under the representative condition during minimum ice melting current, the rated current of deicing device should be higher than minimum ice melting current in the Practical Project, conveniently to carry out quick ice-melt.According to engineering experience, when the rated current of device reached 1.5～2.0 times minimum ice melting current, (10min) carried out effective deicing in the short period of time.Under above-mentioned technical conditions, according to the full-bridge modular multilevel unsteady flow of Technical Design described in the utility model rated direct voltage be 12kV, rated direct current is 1000A.Under the DC ice melting pattern, both comprised alternating current component in the output current of described full bridge power module, comprise again DC component, as shown in Figure 5.Compare with HBMMC, the output voltage of DC de-icing device described in the utility model can be regulated arbitrarily from 0 to specified 12kV, as shown in Figure 6.
Above embodiment is a concrete implementing circuit schematic diagram of the present utility model, does not limit protection range of the present utility model with this.
Claims (3)
1. DC de-icing device based on the full-bridge modular multi-level converter is characterized in that:
Described full-bridge modular multi-level converter is the three-phase bridge structure, each of current transformer comprises a upper brachium pontis and a lower brachium pontis mutually, upper and lower brachium pontis is composed in series from beginning to end by N full bridge power module respectively, form many level of chain type structure, and each brachium pontis be respectively from top to bottom the 1st, the 2nd ..., a N full bridge power module, wherein N is the integer greater than 1;
Each head end of going up mutually the 1st power model of brachium pontis links together, and forms the positive pole of common DC bus, and each descends the end of N power model of brachium pontis to link together mutually, forms the negative pole of common DC bus;
Each end of going up mutually N power model of brachium pontis descends the head end of the 1st power model of brachium pontis respectively to link together by a smoothing reactor with this mutually, and the tie point of two reactors connects the ac bus of this phase.
2. DC de-icing device according to claim 1 is characterized in that:
Described full bridge power module is the H bridge construction, consisted of by four turn-off device Q1 ~ Q4 and direct current support capacitor C, the turn-off device Q1 of top and the collector electrode of Q3 link to each other with the positive pole of direct current support capacitor C, and the turn-off device Q2 of below and the emitter of Q4 link to each other with the negative pole of direct current support capacitor C; The emitter of turn-off device Q1 links to each other with the collector electrode of turn-off device Q2, forms the head end of full bridge power module, and the emitter of turn-off device Q3 links to each other with the collector electrode of turn-off device Q4, forms the end of full bridge power module.
3. DC de-icing device according to claim 2 is characterized in that:
The positive pole of described common DC bus and the negative pole of common DC bus are applied to respectively on the corresponding DC ice-melting.
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| CN201220301276XU CN202798507U (en) | 2012-06-21 | 2012-06-21 | DC ice melting device based on full-bridge modular multi-level converter |
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| CN201220301276XU CN202798507U (en) | 2012-06-21 | 2012-06-21 | DC ice melting device based on full-bridge modular multi-level converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739080A (en) * | 2012-06-21 | 2012-10-17 | 北京四方继保自动化股份有限公司 | Direct current de-icing device based on full-bridge modular multilevel converter |
| CN103236706A (en) * | 2013-04-23 | 2013-08-07 | 中国科学院电工研究所 | Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology |
| CN103701348A (en) * | 2013-12-21 | 2014-04-02 | 华南理工大学 | H bridge type three-phase modular unit series combination high-voltage transformer |
| US9318974B2 (en) | 2014-03-26 | 2016-04-19 | Solaredge Technologies Ltd. | Multi-level inverter with flying capacitor topology |
| CN107546698A (en) * | 2017-09-05 | 2018-01-05 | 许继电气股份有限公司 | A kind of DC de-icing device based on MMC topological structures |
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- 2012-06-21 CN CN201220301276XU patent/CN202798507U/en not_active Expired - Lifetime
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| CN102739080A (en) * | 2012-06-21 | 2012-10-17 | 北京四方继保自动化股份有限公司 | Direct current de-icing device based on full-bridge modular multilevel converter |
| CN102739080B (en) * | 2012-06-21 | 2015-04-22 | 北京四方继保自动化股份有限公司 | Direct current de-icing device based on full-bridge modular multilevel converter |
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| CN103236706A (en) * | 2013-04-23 | 2013-08-07 | 中国科学院电工研究所 | Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology |
| CN103236706B (en) * | 2013-04-23 | 2015-08-19 | 中国科学院电工研究所 | The battery energy storage system of transformation topology is handed over based on modular multilevel |
| CN103701348A (en) * | 2013-12-21 | 2014-04-02 | 华南理工大学 | H bridge type three-phase modular unit series combination high-voltage transformer |
| CN103701348B (en) * | 2013-12-21 | 2016-10-05 | 华南理工大学 | H bridge type three-phase module unit tandem compound high tension transformer |
| US10404154B2 (en) | 2014-03-26 | 2019-09-03 | Solaredge Technologies Ltd | Multi-level inverter with flying capacitor topology |
| US10153685B2 (en) | 2014-03-26 | 2018-12-11 | Solaredge Technologies Ltd. | Power ripple compensation |
| US10680505B2 (en) | 2014-03-26 | 2020-06-09 | Solaredge Technologies Ltd. | Multi-level inverter |
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| US10886832B2 (en) | 2014-03-26 | 2021-01-05 | Solaredge Technologies Ltd. | Multi-level inverter |
| US10886831B2 (en) | 2014-03-26 | 2021-01-05 | Solaredge Technologies Ltd. | Multi-level inverter |
| US11296590B2 (en) | 2014-03-26 | 2022-04-05 | Solaredge Technologies Ltd. | Multi-level inverter |
| US11632058B2 (en) | 2014-03-26 | 2023-04-18 | Solaredge Technologies Ltd. | Multi-level inverter |
| US9318974B2 (en) | 2014-03-26 | 2016-04-19 | Solaredge Technologies Ltd. | Multi-level inverter with flying capacitor topology |
| US11855552B2 (en) | 2014-03-26 | 2023-12-26 | Solaredge Technologies Ltd. | Multi-level inverter |
| CN107546698A (en) * | 2017-09-05 | 2018-01-05 | 许继电气股份有限公司 | A kind of DC de-icing device based on MMC topological structures |
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Granted publication date: 20130313 |