CN105162310A - Structural device for cascaded type cophase power supply converter - Google Patents
Structural device for cascaded type cophase power supply converter Download PDFInfo
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- CN105162310A CN105162310A CN201510704467.9A CN201510704467A CN105162310A CN 105162310 A CN105162310 A CN 105162310A CN 201510704467 A CN201510704467 A CN 201510704467A CN 105162310 A CN105162310 A CN 105162310A
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Abstract
The invention relates to a structural device for a cascaded type cophase power supply converter. The device comprises power units which can be connected in series and in parallel, multiple columns of cabinet bodies which are formed by connecting power unit single cabinets and a container for containing the cabinet bodies. According to the structural device for the cascaded type cophase power supply converter, the whole structural design and connections aiming at the power units are optimized in the structural device, and by means of the efficient series-wound and shunt-wound design and the symmetric design of the electrical structure, back-to-back power units are formed, so that the functions of a high-voltage cophase power supply system are achieved in structure, and the technical effects that electrical sectioning is canceled, the safety and the comfort of a train are improved, and damage of an idle current and a harmonic current to the system is reduced are achieved.
Description
Technical field
The invention belongs to track traffic electric power electronic technology field, particularly a kind of a kind of converter structure device be applied in railway tandem type cophase supply system.
Background technology
At present, what China's electrified railway traction power supply system adopted is power frequency single phase alternating current (A.C.) supply power mode.Therefore, for three-phase electrical power system, electrified railway traction power supply system is the special system of single-phase earthing, due to structural asymmetric, electrified railway traction power supply system is caused to there is harmonic content large, outstanding and the large power quality problem of reactive power many three of negative phase-sequence, and the separate and random fluctuation of electric locomotive as single-phase load, make these problems more outstanding.In order to improve electric power quality problem, propose employing and comprise increase power supply capacity, take the balancing transformer of special wiring, traction substation Commutating connect, static negative-sequence current compensating chain device etc., though these measures can alleviate the negative effect of high-speed overload, due to traction load randomness over time and space, make to improve poor effect.Due to the Commutating connect of traction substation, determine and must there is electric phase-splitting link on Traction networks.When motor supply shop is to supply arm end, has to pass through and move back level, close auxiliary unit and disconnect the sequence of operations such as main circuit breaker, make train speed and loss of traction comparatively large and be attended by the normal traveling of overvoltage phenomena impair locomotive.Due to electric neutral section complex structure, expensive, therefore electric neutral section becomes one of weak link in whole tractive power supply system, the development of restriction high-speed overload railway.Along with device for high-power power electronic come out one after another and the appearing as of development, particularly Survey of Flexible AC Transmission System Technology of modern power electronic control technology realizes electrified railway in-phase power supply and higher levels of through power supply provides new thinking.
Current China Traction Substation of Electric Railway is all power taking from public electric wire net, generally adopts single phase industrial frequence alternating current to be locomotive power supply.Electric power system wishes that all loads are all the fundamental currents of taking three-phase symmetrical from electrical network, and to make full use of the capacity of circuit, equipment, minimizing reactive current and harmonic current are to the harm of system.For meeting this requirement, electric railway adopts phase sequence rotation, the scheme that segmentation phase-splitting is powered.Can not be identical at any time but the traction due to each section meets size, phase-splitting segmentation scheme just alleviates the impact of three-phase imbalance to a certain extent, and fundamentally can not solve the impact of the single-phase electricity consumption of railway load on whole shared electrical network.For the problem of above rail traction substation, major part adopts reactive power compensator or shunt capacitor fixed compensation pattern at present.Because traction meets the acute variation of operation, the overcompensation just causing underloading idle and the idle undercompensation of heavy duty, its result all causes traction power supply constant power factor on the low side.
The domestic high pressure cophase supply converter device also not having producer to do this topological structure at present, homophase formula before on market is powered converter structure device, what adopt because inner is not angle iron frame Welding Structure, what adopt is connect with screw between insulation section bar, such shortcoming is exactly that bulk strength is not high, when delivery, need power cell and cabinet separately delivery, power cell is being put into cabinet one by one to on-the-spot, do all kinds of connecting line at the scene, site operation amount is quite large, needs self-inspection line after completing.Present structure can by whole Whole Equipment shipping, and site operation amount is very little, and interconnector need not move again, can direct-electrifying debugging.
Summary of the invention
For the blank that high pressure cophase supply system exists at present, we utilize application modern power electronics technology and Microprocessor S3C44B0X technology, the cophase supply technology of development, realize the innovation of traction power supply technology, in order to realize the utilization of this technology, need to develop cophase supply constructional device system, by simulated field operating condition in factory, with reference to the wind electric converter that my company successfully researches and develops, photovoltaic DC-to-AC converter, high-power SVG, the new products such as 690V large-capacity transducer, and the technical foundation using high voltage converter to accumulate for many years, develop the constructional device for tandem type cophase supply current transformer of a new generation.
Technical solution of the present invention is as follows:
For a constructional device for tandem type cophase supply current transformer, described device comprises the cabinet that can be formed by connecting for the power cell of series and parallel connections, some row power cell list cabinets and the container holding cabinet; Cabinet of often itemizing is a lead frame, is respectively arranged with front and back door-plate before and after the often row power cell list cabinet being separated into N layer, and the front door that every one deck of every row power cell list cabinet is corresponding arranges an air inlet, and there is independent ventiduct at cabinet rear portion of often itemizing; Described power cell is positioned over every one deck of often row power cell list cabinet, and power cell internal forms horizontal duct from front to back, and is aggregated into the independent ventiduct at cabinet rear portion of often itemizing, and the horizontal UNICOM of independent ventiduct at some cabinet rear portions of itemizing is an integral air duct; Be horizontally disposed with one section of air channel interface channel often itemizing between cabinet Rear Door appropriate location and container, described air channel interface channel directly with to the blower fan being fixed on container rear end that should arrange is connected, some row fan parallel-connections are in duct outlet, and form air channel path, N is natural number.
For above-mentioned " suitably " position, if N is even number, air channel interface channel is arranged on the positive medium position of single cabinet Rear Door, if N is odd number, air channel interface channel is arranged on the point midway of power cell corresponding to the positive middle part of single cabinet Rear Door and last layer power cell line, its object is exactly to ensure when total blast volume is certain, the air quantity of each power cell of efficient balance.
Further, front door air inlet is provided with filter screen, and described filter screen contains flame retardant polyurethane sponge.
Further, open multiple air inlet in container forward position, and shutter is set in air inlet position, the air-admitting surface that shutter area is arranged on front door corresponding to every one deck of power cell list cabinet.
Further, also comprise the copper bar for connecting power cell and insulating part, described copper bar is introduced in the integral air duct of described constructional device after connecting.
Further, described copper bar and insulating part comprise series connection copper bar, input copper bar in parallel, rear portion switch-over row, series connection exports row A, series connection exports row B, power cell input copper bar, front and back switch-over row, rear portion exports row A, rear portion exports row B and insulation column, insulation folder and insulation thick stick; Described power cell comprises upper and lower two parts joint, top sub is power unit cascade side, containing U, V two-phase, U, V phase of adjacent power unit is connected in series by series connection copper bar by described series side, head and the tail after serial connection are respectively series connection output row A, connect the row of output B, and described series connection output row A, the row of output B that connects are connected to rear portion output row A and rear portion output row B respectively by front and back switch-over row; Lower connector is power cell side in parallel, and described side in parallel connects input copper bar in parallel, and input copper bar in parallel connects rear portion switch-over row by front and back switch-over row, then inputs copper bar with rear portion power cell and be connected to form path; Wherein, switch-over row is fixed on by insulation column in the lead frame of single cabinet side, and power cell input copper bar is fixed on by insulation folder and is positioned on the insulation thick stick of independent ventiduct, and insulation thick stick is arranged in lead frame.
Further, adjacent power unit list cabinet is connected by screw and forms.
Further, insulation board is provided with between every layer that often row power cell list cabinet is split into N layer.
Further, described power cell is divided into upper and lower two parts, and top is series side electric loop, and bottom is side in parallel electric loop, forms horizontal duct between upper and lower part, and top and the bottom structure specular.
Further, also comprise thin-film capacitor, string is side stack bus bar also, described series and parallel side electric loop is by IGBT power external member, stack bus bar, control plate, export copper bar composition, described IGBT power external member comprises radiator, thin-film capacitor and radiator are positioned in horizontal duct, and the stack bus bar of top and the bottom connects by string also side connection stack bus bar.
The present invention's beneficial effect is compared with prior art:
Overall construction design of the present invention, power cell optimize the design of efficient series and parallel in constructional device and electrical structure symmetric design forms back-to-back power cell, the function of high pressure cophase supply system is made to become possibility on structure realizes, achieve and cancel electric phase-splitting, raising train safe and comfortableness, minimizing reactive current and harmonic current are to the technique effect of harm to the system.
In large-scale power electronic equipment, equipment is along with the increase of temperature, life-span can reduce, failure rate can increase, cold wind is from container shutter to cabinet front gate inlet air mouth, after flowing through power cell internal independence wind chamber, the thermal losses power band of power device is out become hot blast to be aggregated in the integral air duct of rear portion, taking hot blast out of container outside by centrifugal blower enters in air, the Duct design of this constructional device solves the heat radiation of the power device in cophase supply current transformer, greatly strengthens the reliability and stability of equipment.
Equipment is arranged on internal container, conveniently can be positioned over any location of railway with container, and be easy to resettlement, degree of protection is IP53; Container and cabinet adopt Welding Structure technology, the advantages such as the advantage of this technology is that Whole Equipment has very high mechanical strength, and cabinet distortion is little, and can ensure that cabinet is overall shipping when delivering transport to greatest extent, in proterctive equipment, device is not damaged.
Conventional fan is placed on cabinet top, make each power cell rear portion air outlet to the range difference of blower fan apart from large, each power cell wind flow difference is large, blower fan is placed on cabinet rear portion air outlet by the present invention, generally be provided with three layers, the optimum height of blowing machine placement can be obtained by test, make two-layer power cell rear portion air outlet consistent to the distance of blower fan, reduce with the range difference distance of lower floor's power cell rear portion air outlet to blower fan, shorten the distance in all air channels equally, reduce windage, improve wind speed; The advantage of this technology is that the heat radiation of each power cell is balanced, and cooling fan utilance is high, good heat dissipation effect.
Air intake vent on front door is equipped with the flame retardant polyurethane sponge of 35PPI, its performance is fire-proof and water-proof acid-alkali-corrosive-resisting, when air intake vent air intake time, larger dust granule in energy filtered air, make environmental contaminants can not access arrangement inner, environmentally situation, regularly to equipment filter gauze cleaning, the advantage of this technology is to reduce the class of pollution, improves equipment reliability of operation.
Connect the copper bar of power cell and be introduced in cooling and the maintenance that integral air duct is conducive to copper bar, many groups power cell input copper bar uses insulation folder to be fixed on insulation thick stick, and from air channel, enter unit inside, make cabling in cabinet clean and tidy, the advantage of this technology is to make full use of duct space, and Operation and Maintenance is all convenient.
At power cell structure design aspect, because power cell is core devices with IGBT, switching frequency is high, requires that DC bus stray inductance is little, prevents because the spike voltage in IGBT switching process causes it to damage.Therefore, my company proposes a kind of power cell sandwich bus structure designing technique, and this technology adopts the busbar laminate with capacity effect, can effectively reduce DC bus stray inductance, reduce the spike voltage that in IGBT course of action, inductance produces, ensure the work that IGBT is safe and reliable.Buy power external member unit, external member advantage is that volume is little, and efficiency is high, dependable performance simultaneously; Electric capacity adopts thin-film capacitor in addition, improves equipment dependability and life-span.
Accompanying drawing explanation
Fig. 1 is side sectional view of the present invention.
Fig. 2 is front view of the present invention.
Fig. 3 is dorsal view of the present invention.
Fig. 4 is front door figure of the present invention.
Fig. 5 is Rear Door figure of the present invention.
Fig. 6 is that the present invention removes front door figure.
Fig. 7 is that the present invention removes Rear Door figure.
Fig. 8 is power cell partial enlarged drawing in the present invention.
Fig. 9 is power cell structure figure of the present invention.
Figure 10 is cabinet profile of the present invention.
Embodiment
Further a kind of constructional device for tandem type cophase supply current transformer that the present invention relates to is described below in conjunction with accompanying drawing.
As shown in Figure 1, converter equipment of the present invention is placed in container, be connected with container base by bottom fot screw, the draft type of equipment is horizontal ventilation, cold wind enters into every column unit cabinet Qianmen from container shutter, through Qianmen, the filter screen of upper bottom enters into each power cell internal independent ventiduct, to cabinet rear portion, upper, middle and lower air channel is gathered, by a blower fan, upper, middle and lower three-layer unit hot blast is extracted out, air inlet filter screen corresponding to Qianmen is arranged in parallel, be arranged in parallel by multiple similar single cabinet, air channel, rear portion is aggregated into a wind trunk, run by multiple fan parallel-connection, integral heat sink is effective.
As shown in Figure 2, container front view by organizing shutter more, and maintenance door forms, and side has equipment to pass in and out gate, and all doors are closed condition when equipment runs, and are cooled as air intake vent air intake by shutter to equipment.
As shown in Figure 3, container dorsal view is by multiple centrifugal blower laid out in parallel, be arranged on container, each blower fan left and right upper side is shut, and is provided with air outlet below only having, and hanging over outdoor can reflux by rainwater-proof, outwards dry during fan operation, make to form negative pressure in air channel, the heat of electronic device is taken out of, reaches air-cooled effect.
As shown in Figure 4, front portion is all covered by door cover plate before with handles by inner current transformer front door figure, five unit cabinets are spelled cabinet screw and are connected to form, each unit cabinet dress upper, middle and lower three-layer unit, the air intake vent of the corresponding inner each unit of air intake vent of each front door, air intake vent on front door is equipped with the flame retardant polyurethane sponge of 35PPI, its performance is fire-proof and water-proof acid-alkali-corrosive-resisting, when air intake vent air intake time, larger dust granule in energy filtered air, make environmental contaminants can not access arrangement inner, improve equipment dependability.
As shown in Figure 5, rear portion is all covered by rear door cover plate with handles by inner current transformer Rear Door figure, allows formation air channel, cabinet rear portion, and the position opening in middle and upper part is so that connecting fan passage, and junction is that ring flange connects, and is convenient to dissembling inspection.
As shown in Figure 6, current transformer goes front door figure to be made up of five unit cabinets, connection copper bar between 15 power cells and several unit.Power cell divides upper and lower two parts joint, top sub is series side, before cabinet, the series side series connection copper bar of 15 power cells is connected in series, residue one first tail unit series connection export row A and series connection export row B by front and back switch-over row guide to cabinet rear portion export row A and rear portion export row B gather air channel export; Lower connector is side in parallel, side in parallel copper bar is fixed on the switch-over row of front and back, front and back switch-over row is fixed on insulation column, insulation column is fixed in the lead frame of single cabinet side, and the gather air channel and rear portion switch-over row and power cell of being guided to cabinet rear portion by front and back switch-over row input copper bar and connect into path and power.
As shown in Figure 7, current transformer goes Rear Door figure to input copper bar group by power cell and switching copper bar forms, and all input copper bar use insulation folders clip and are fixed on vertical insulation bar, and insulation bar is fixed in lead frame, many groups copper bar gather in air channel be conducive to copper bar heat radiation, stability is better.
As shown in Figure 8, power cell partial enlarged drawing is a zoomed-in view of the mode of connection in order to better understand Fig. 6 Fig. 7.
As shown in Figure 9, be divided into upper and lower two parts in power cell structure figure, top is series side electric loop, and by IGBT power external member (containing radiator), stack bus bar, controls plate, exports copper bar composition; Bottom is side in parallel electric loop, and by IGBT power external member (containing radiator), stack bus bar, controls plate, exports copper bar composition; The radiator of the thin-film capacitor that connection in series-parallel side shares and top and the bottom is arranged in the air channel, inside formed in the middle part of unit, the string of side side connects stack bus bar by the electrical connection of top and the bottom, external rack is relied on to form a back-to-back power cell of likeness in form, each power device couples together by the main loop design according to unit, series side and side structure in parallel are that top and the bottom mirror is symmetrical, radiator and thin-film capacitor are placed in inner air channel and carry out wind-cooling heat dissipating.
As shown in Figure 10, by framework in cabinet cutaway view, insulation column, insulation folder, insulation thick stick, before and after switch-over row composition, the anterior connection in series-parallel copper bar of main display guides to rear portion, air channel by front and back switching copper bar, exports the connection of arranging A, B and the input of rear portion power cell drain and be fixed on framework to position and by all kinds of insulating material with rear portion.
Description for the understanding of embodiment be only for help understand the present invention, instead of be used for restriction of the present invention.Those skilled in the art all can utilize thought of the present invention to carry out some and change and change, as long as its technological means has depart from thought of the present invention and main points, still within protection scope of the present invention.
Claims (9)
1. for a constructional device for tandem type cophase supply current transformer, it is characterized in that: described device comprises the cabinet that can be formed by connecting for the power cell of series and parallel connections, some row power cell list cabinets and the container holding cabinet; Cabinet of often itemizing is a lead frame, is respectively arranged with front and back door-plate before and after the often row power cell list cabinet being separated into N layer, and the front door that every one deck of every row power cell list cabinet is corresponding arranges an air inlet, and there is independent ventiduct at cabinet rear portion of often itemizing; Described power cell is positioned over every one deck of often row power cell list cabinet, and power cell internal forms horizontal duct from front to back, and is aggregated into the independent ventiduct at cabinet rear portion of often itemizing, and the horizontal UNICOM of independent ventiduct at some cabinet rear portions of itemizing is an integral air duct; Be horizontally disposed with one section of air channel interface channel often itemizing between cabinet Rear Door appropriate location and container, described air channel interface channel directly with to the blower fan being fixed on container rear end that should arrange is connected, some row fan parallel-connections are in duct outlet, and form air channel path, N is natural number.
2. a kind of constructional device for tandem type cophase supply current transformer according to claim 1, it is characterized in that: front door air inlet is provided with filter screen, described filter screen contains flame retardant polyurethane sponge.
3. a kind of constructional device for tandem type cophase supply current transformer according to claim 1, it is characterized in that: open multiple air inlet in container forward position, and shutter is set in air inlet position, the air-admitting surface that shutter area is arranged on front door corresponding to every one deck of power cell list cabinet.
4. a kind of constructional device for tandem type cophase supply current transformer according to claim 1, is characterized in that: also comprise the copper bar for connecting power cell and insulating part, and described copper bar is introduced in the integral air duct of described constructional device after connecting.
5. a kind of constructional device for tandem type cophase supply current transformer according to claim 4, is characterized in that: described copper bar and insulating part comprise series connection copper bar, input copper bar in parallel, rear portion switch-over row, series connection exports row A, series connection exports row B, power cell input copper bar, front and back switch-over row, rear portion exports row A, rear portion exports row B and insulation column, insulation folder and insulation thick stick; Described power cell comprises upper and lower two parts joint, top sub is power unit cascade side, containing U, V two-phase, U, V phase of adjacent power unit is connected in series by series connection copper bar by described series side, head and the tail after serial connection are respectively series connection output row A, connect the row of output B, and described series connection output row A, the row of output B that connects are connected to rear portion output row A and rear portion output row B respectively by front and back switch-over row; Lower connector is power cell side in parallel, and described side in parallel connects input copper bar in parallel, and input copper bar in parallel connects rear portion switch-over row by front and back switch-over row, then inputs copper bar with rear portion power cell and be connected to form path; Wherein, switch-over row is fixed on by insulation column in the lead frame of single cabinet side, and power cell input copper bar is fixed on by insulation folder and is positioned on the insulation thick stick of independent ventiduct, and insulation thick stick is arranged in lead frame.
6. a kind of constructional device for tandem type cophase supply current transformer according to claim 1, is characterized in that: adjacent power unit list cabinet is connected by screw and forms.
7. a kind of constructional device for cophase supply current transformer according to claim 1, is characterized in that: be provided with insulation board between every layer that often row power cell list cabinet is split into N layer.
8. a kind of constructional device for cophase supply current transformer according to claim 1, it is characterized in that: described power cell is divided into upper and lower two parts, top is series side electric loop, bottom is side in parallel electric loop, horizontal duct is formed between upper and lower part, and top and the bottom structure specular.
9. a kind of constructional device for cophase supply current transformer according to claim 8, it is characterized in that: also comprise thin-film capacitor, string is side stack bus bar also, described series and parallel side electric loop is by IGBT power external member, stack bus bar, control plate, export copper bar composition, described IGBT power external member comprises radiator, thin-film capacitor and radiator are positioned in horizontal duct, and the stack bus bar of top and the bottom connects by string also side connection stack bus bar.
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| CN201510704467.9A CN105162310B (en) | 2015-10-27 | 2015-10-27 | A kind of constructional device for tandem type cophase supply current transformer |
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| CN201510704467.9A CN105162310B (en) | 2015-10-27 | 2015-10-27 | A kind of constructional device for tandem type cophase supply current transformer |
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| CN105162310B CN105162310B (en) | 2017-09-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112398311A (en) * | 2020-11-10 | 2021-02-23 | 西安许继电力电子技术有限公司 | Multi-module series-parallel power converter device |
| CN113726203A (en) * | 2020-05-22 | 2021-11-30 | 株洲中车时代电气股份有限公司 | Simplified converter circuit and converter device |
| CN114221521A (en) * | 2021-12-14 | 2022-03-22 | 浙江华章科技有限公司 | Novel electrical frequency conversion cabinet |
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| CN113726203B (en) * | 2020-05-22 | 2024-01-30 | 株洲中车时代电气股份有限公司 | Simplified and unified converter circuit and converter device |
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| CN114221521B (en) * | 2021-12-14 | 2023-11-24 | 浙江华章科技有限公司 | Novel electrical variable frequency cabinet |
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| CN105162310B (en) | 2017-09-12 |
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