CN102136809A - Urban rail maglev train traction converter output device - Google Patents
Urban rail maglev train traction converter output device Download PDFInfo
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- CN102136809A CN102136809A CN2011100796563A CN201110079656A CN102136809A CN 102136809 A CN102136809 A CN 102136809A CN 2011100796563 A CN2011100796563 A CN 2011100796563A CN 201110079656 A CN201110079656 A CN 201110079656A CN 102136809 A CN102136809 A CN 102136809A
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Abstract
The invention discloses an urban rail maglev train traction converter output device. The device comprises an inverter, an input switch cabinet and an output converting device, wherein the input switch cabinet is in circuit connection with an input end of the inverter; the output converting device is in circuit connection with an output end of the inverter; the output end of the output converting device is in circuit connection with a plurality of external motors; the inverter comprises a plurality of inverter modules; and the output converting device comprises an output transformer which is in circuit connection with the output end of the inverter and an output switch device which is in circuit connection with the output end of the output transformer. The urban rail maglev train traction converter output device is provided with a plurality of same inverter modules and reduces the capacity demand of the traction inverter, thereby reducing the weight and the volume of the inverter and being beneficial to the arrangement of equipment; the voltage resistant grade and the output current demand of an inverter power device are reduced, and the cost of a traction system is reduced; the voltage formed by combining two inverters is high, and the speed-up capability of a train high-speed section can be improved; and the redundancy and the reliability of the system are improved.
Description
Technical field
The present invention relates to the traction technique in a kind of urban railway magnetic suspension traffic technique field, be specifically related to a kind of output device that is installed in the traction convertor on the urban railway magnetic suspension train.
Background technology
The urban railway magnetic suspension train is a type of the floating train of normal magnetic conduction, and the principle of its suspension is to utilize the electromagnet that the is installed in lower vehicle attraction to the F shape magnetic conduction rail that is installed in the track down either side, and train is suspended.Adopt vehicle-mounted current transformer to supply with traction electric machine frequency conversion voltage, the operation of short preliminary linear Induction Motor-Driven magnetic-levitation train.The urban railway magnetic suspension train has advantages such as climbing capacity is strong, radius of turn is little, the operation noise is low, energy consumption is lower, cost is reasonable, is a kind of novel rail pattern that has very much development potentiality.
In the present track traffic trailer system, generally adopt current transformer directly to drive the mode of traction electric machine tractor-trailer train.The mode of traction that is adopted on the urban railway magnetic suspension train also is this mode, as shown in Figure 1.Vehicle-mounted current transformer comprises switch cubicle, and with the inversion module that the circuit of output terminal of this switch cubicle is connected, the circuit of output terminal of this inversion module connects motor.Vehicle-mounted current transformer is obtained direct current from dc bus, is directly to output to traction electric machine behind the alternating current by the inversion module of a three-phase with dc inverter, and train is implemented traction.The traction electric machine that is connected to inversion module output can be 1 or multiple electric motors.During multiple electric motors, can be in parallel, also can be series connection, or series connection earlier is in parallel again or first parallel connection is connected again.
In order to obtain the higher startup acceleration and the higher speed of service simultaneously, the capacity that all actual traction of the current transformer capacity of a general configuration needs is big, and this makes current transformer volume, weight all bigger.Simultaneously, also must select big electric current, high withstand voltage power device, so also cause the trailer system cost higher.
To current transformer be motor power supply the distraction procedure analysis as can be known, vehicle is at boost phase, current transformer need be exported big electric current, and needs this moment the voltage of current transformer output not high.Raise, need voltage to raise gradually gradually just to guarantee certain output current, quicken along with speed with tractor-trailer train.Speed is high more, also high more in order to overcome winding back emf, required voltage, with output current and then the maintenance certain acceleration that keeps a certain size.Go up in limited time when voltage reaches current transformer output, voltage keeps necessarily, output current is restricted, and the train acceleration capacity also is restricted.If under big speed, still have certain acceleration, need current transformer that higher voltage is provided.But, the big and actual output capacity and little of the design capacity of current transformer like this, its ability can not finely be brought into play.
Generally speaking, boost phase needs big electric current, high-speed cruising stage to need high voltage, and big electric current and high voltage do not occur simultaneously.Voltage design current transformer when pressing starting current and high-speed cruising usually, like this, the traction capacity of current transformer is not fully utilized, and causes volume and weight bigger simultaneously.
Summary of the invention
The invention provides a kind of urban railway magnetic suspension train traction current transformer output device, can satisfy at the same time on the basis of big electric current of low speed and high speed high voltage requirements, reduce demand the traction convertor capacity.
For achieving the above object, the invention provides a kind of urban railway magnetic suspension train traction current transformer output device, this device comprises inverter, the input switch cabinet that is connected with the inlet circuit of this inverter, be characterized in that this device also comprises the output conversion device that is connected with the circuit of output terminal of this inverter;
The circuit of output terminal of above-mentioned output conversion device is connected with several external motors;
Above-mentioned inverter comprises several inverter modules;
Above-mentioned output conversion device comprises: the output transformer that is connected with the circuit of output terminal of above-mentioned inverter, and the output switch apparatus that is connected with the circuit of output terminal of this output transformer.
The structure of several above-mentioned inverter modules is identical.
Above-mentioned inverter module also is arranged with casing outward; These a plurality of inverter modules are arranged in the same casing, and perhaps each inverter module is separately positioned on separately independently in the casing.
The three-phase output voltage of several above-mentioned inverter modules can be respectively same-phase or opposite phase.
Circuit is connected with the centre tap device on the mid point of the former limit winding of above-mentioned output transformer.
Circuit is connected with cable or connects row on the above-mentioned centre tap device; This cable or connection row's current capacity is not less than the twice of the former limit of output transformer winding.
It is adjustable that the transformation ratio of above-mentioned output transformer can be made as 1:1 to 1:n, and n adopts greater than 1 numerical value or less than 1 numerical value.
Above-mentioned output switch apparatus comprises second main switch that is connected with this centre tap device circuit, first main switch that is connected with secondary winding high-voltage output end circuit; The circuit connection has interlocking control between this first main switch and second main switch.
During launch train, or behind the launch train but do not reach on the inverter output voltage in limited time, the first above-mentioned main switch closure, second main switch is opened; Meet or exceed on the inverter output voltage and prescribe a time limit, the first above-mentioned main switch is opened, the second main switch closure.
During vehicle launch, the first main switch closure of output switch apparatus, second main switch disconnects, this moment, output transformer worked in Direct Model, two electric currents that inverter module is sent into converge at the centre tap device place of former limit winding, and two inverter modules are according to the modulation instructions output voltage of unanimity, its phase place, size are all identical, and the place exports to motor through first main switch by the centre tap device.This moment, the secondary winding of output transformer was not worked, and output transformer is equivalent to reactor.
When inverter output voltage reaches in limited time, two inverter module output currents are reduced to zero, output switch apparatus switches, the second main switch closure, first main switch disconnects, and this moment, output transformer worked in the transformer pattern.Two inverter modules recover the output modulation voltage, and both output voltage phase places are opposite, and size is identical, draw to motor output through second main switch after output transformer boosts.When being implemented in train and reaching certain high speed, inverter improves behind the output voltage to motor output high pressure, satisfies in motor requirement to voltage when running up speed-raising down.
The current transformer of the track traffic trailer system of a kind of urban railway magnetic suspension train traction of the present invention current transformer output device and prior art is compared, its advantage is, the present invention is provided with several inverter modules, export same maximum current at the traction inversion system, same maximum voltage, be under the same power situation, the electric current of each inverter module of inverter and voltage are lower than the inversion module of prior art.The capacity of each inverter module of inverter, and two module capacity sums are lower than traditional inversion module.This technical characterictic has the following advantages:
(1) reduces the capacity requirement of traction invertor, thereby reduced weight, the volume of inverter, helped the layout of equipment;
(2) reduced the voltage withstand class and the output current demand of power device of inverter, thereby increased the device range of choice, reduced the cost of power device, and trailer system claims this;
(3) because the voltage that two inverters are combined to form is higher, motor increases of exerting oneself, thereby the acceleration capacity of raising train high regime;
(4) every joint compartment is equipped with two inverter modules, when an inverter module fault is out of service, another inverter module still can be implemented traction with direct pulse mode to vehicle by output transformer, thereby has increased the redundancy and the degree of reliability of system;
In addition, in launch train and low cruise stage, the traction of magnetic-levitation train motor needs bigger traction current, imports motor after the former limit parallel connection of output current by output transformer of two inversion modules of inverter at this moment, can obtain bigger stator current.After magnetic-levitation train reaches certain speed, quick switching by output switch apparatus, two inverter modules by the output transformer series connection, behind transformer secondary output HIGH voltage again to motor output three-phase high-voltage so that when satisfying motor and running up to the demand of voltage.
Description of drawings
Fig. 1 is the circuit diagram of the train-installed traction convertor of prior art urban railway magnetic suspension;
Fig. 2 is the circuit diagram of a kind of urban railway magnetic suspension train traction current transformer output device of the present invention's proposition;
Fig. 3 is the overall circuit figure of a kind of urban railway magnetic suspension train traction current transformer output device of the present invention's proposition;
Fig. 4 is the circuit diagram of the output conversion device of a kind of urban railway magnetic suspension train traction current transformer output device of the present invention's proposition;
Fig. 5 is the circuit diagram of the output transformer of a kind of urban railway magnetic suspension train traction current transformer output device of the present invention's proposition.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
As shown in Figure 2, the present invention has illustrated a kind of urban railway magnetic suspension train traction current transformer output device, the train-installed traction convertor of the urban railway magnetic suspension of this device and prior art is compared, and current transformer output device of the present invention includes inverter 1, and this inverter 1 includes two groups of inverter modules 11.Go back circuit between the output of this inverter 1 and the motor 4 and be connected with output conversion device 2, this output conversion device 2 includes: the output transformer 21 that is connected with the circuit of output terminal of inverter 1, and the output switch apparatus 22 that is connected with the circuit of output terminal of this output transformer 21, the circuit of output terminal of this output switch apparatus 22 connects motor 4.Current transformer output device of the present invention is provided with a plurality of inverter modules 11, reduces the capacity requirement of traction invertor 1, reduces inverter 1 quality and volume; Reduce the voltage withstand class and the output current of inverter 1 device; The voltage height that a plurality of inverter modules 11 are formed, the acceleration capacity of raising train high regime; A plurality of inverter modules 11 are set increases the redundancy and the degree of reliability of system.Inverter 1 inserts traction electric machine 4 by output conversion device 2, by the switching of output conversion device 2, can satisfy at the same time on the basis of big electric current of low speed and high speed high voltage requirements, reduces the demand to the traction convertor capacity.
Specify a kind of embodiment of a kind of urban railway magnetic suspension train traction of the present invention current transformer output device below in conjunction with Fig. 3.
A kind of urban railway magnetic suspension train traction current transformer output device, this device comprises inverter 1, output conversion device 2 and input switch cabinet 3.The input of this inverter 1 is connected with the circuit of output terminal of input switch cabinet 3, and the output of this inverter 1 is connected with the inlet circuit of output conversion device 2.The output of output conversion device 2 is connected with motor 4 circuit.
1-1 ~ 1-5 and 2-1 ~ 2-5 are the motor on every joint train among the figure, and five of 1-1 ~ 1-5 series connection forms one group, five series connection of 2-1 ~ 2-5 and forms another group, insert the three-phase output end of current transformer after two groups of parallel connections.
As shown in Figure 3, this output transformer 21 and output switch apparatus 22 are installed in two respectively independently in the casing.
As shown in Figure 4, output transformer 21 is a three-phase transformer, and it comprises former limit winding 211 and secondary winding 212.Former limit winding 211 is three phase windings, and the two cover input terminals at winding 211 two ends, former limit circuit respectively connect the three-phase output end of two groups of inverter modules 11, and it is identical to insert the three-phase voltage phase sequence at winding 211 two ends, former limit.
Circuit is connected with centre tap device 213 on the mid point of former limit winding 211.Centre tap device 213 is the joint of drawing of output transformer 21 former limit winding 211 mid points, joint is divided into two windings that structure is identical with former limit winding 211, this joint connects one section cable or connects row, and this cable or connection row's current capacity is not less than the twice of output transformer 21 former limit windings 211.
Secondary winding 212 is three phase windings, one end is the Y-connection point, another brings out end, also be provided with tap changer on the secondary winding 212, this tap changer is divided into two sections with secondary winding 212, every section is provided with two and draws joint, and by selecting a joint to connect from every section secondary winding 212, then different splice combinations can form different transformer voltage ratios.It is adjustable that the transformation ratio of output transformer 21 is made as 1:1 to 1:n, and n is greater than 1 numerical value, also less than 1 numerical value, realizes different no-load voltage ratios by the binding combination that changes tap 3,4,5,6.
As shown in Figure 5, be a kind of embodiment of secondary winding 212.Secondary winding 212 comprises secondary winding 2.1 and secondary winding 2.2.Secondary winding 2.1 is provided with tap 3,4, and secondary winding 2.2 is provided with tap 5,6.If select the tap 3 of secondary winding 2.1 to be connected with the tap 6 of secondary winding 2.2, then maximum by short-circuited winding, effectively winding is the shortest, and this moment, the transformation ratio minimum was n1.If select the tap 4 of secondary winding 2.1 to be connected with tap 6 circuit of secondary winding 2.2, perhaps the tap 3 of secondary winding 2.1 is connected with tap 5 circuit of secondary winding 2.2, and this moment, transformation ratio was n2.If select the tap 4 of secondary winding 2.1 to be connected with tap 5 circuit of secondary winding 2.2, this moment, all secondary winding 212 all used, and transformation ratio is n3 to the maximum.By the setting of tap changer, can improve output transformer 21 application flexibility of the present invention, output transformer 21 provides different transformation ratios.
Output switch apparatus 22 comprises two contactor main switches, and two earthing isolators.These two contactor main switches are respectively the first main switch K1 and the second main switch K2, and input side one terminal circuit of the second main switch K2 connects the output of output transformer secondary winding 212, and other end circuit connects load (motor 4).Input side one terminal circuit of the first main switch K1 connects the centre tap device 213 on the former limit winding 211, and other end circuit connects load (motor 4).The second main switch K2 is connected load with the first main switch k1 circuit the mutual circuit of an end connects.Simultaneously, series connection inserts the auxiliary normally-closed contact of the second main switch K2 in the control coil loop of the first main switch K1, series connection inserts the auxiliary normally-closed contact of the first main switch K1 in the control coil loop of the second main switch K2, so promptly realized the first main switch K1 and second main switch K2 interlocking control, prevented that two switches from closing simultaneously.Two earthing isolators are respectively isolating switch K3 and isolating switch K4, and the terminal circuit of isolating switch K3 connects the input side of the first main switch K1, and other end circuit is connected on the vehicle ground network of magnetic-levitation train.The terminal circuit of isolating switch K4 connects the input side of the second main switch K2, and other end circuit is connected on the vehicle ground network of magnetic-levitation train.
As shown in Figure 3, input switch cabinet 3 includes isolating switch QS, and isolating switch QS input side is by train direct current voltage bus circuit connection+1500V direct voltage, and the outlet side circuit is connected with lightning arrester F1; This lightning arrester F1 two terminal circuits connect differential current protection LH1, and circuit is connected with speed-sensitive switch QF between the input side of lightning arrester F1 and differential current protection LH1.The opposite side circuit of differential current protection LH1 is connected with V1 and resistance R 1, and V1 and R1 constitute the inductance continuous current circuit.V1 and R1 also are connected in parallel to the direct current net and press detection VH1, the direct current net is pressed and is detected VH1 circuit connection filter inductance L1, the other end difference circuit of this filter inductance L1 connects the input side of short circuit contactor KM1 and charging contactor KM2, the outlet side of the charging contactor KM2 resistance R 2 that is connected in series, charging contactor KM2 and resistance R 2 are connected in parallel with short circuit contactor KM1.The outlet side circuit of short circuit contactor KM1 connects the input side that discharges and recharges contactor KM3, and the outlet side that the discharges and recharges contactor KM3 fast discharge resistance R3 that is connected in series discharges and recharges contactor KM3 and also is connected in parallel to fixedly discharge resistance R4 with fast discharge resistance R3.
Also comprise the C1 filter capacitor in the inverter 1, VH2 inverter input direct voltage detects, and LH2 inverter input dc power stream detects, and Rch is an overvoltage copped wave resistance, LH4 ~ LH7 is the current transformer output current transformer, and inverter 1 is made up of the inverter module 11 of two two level or many level.The main power device of inverter module 11 adopts the IGBT power switch pipe.The LH2 circuit of inverter 1 connects the input side that discharges and recharges contactor KM3, and the outlet side circuit of inverter LH2 is connected with the filter capacitor C1 and the inverter input direct voltage that are connected in parallel and detects VH2.This inverter LH2, inverter input direct voltage detect VH2 and filter capacitor C1 is arranged in the casing of inverter 1.
Concrete operation workflow below in conjunction with a kind of urban railway magnetic suspension train traction of description of drawings the present invention current transformer output device.
As shown in Figure 3, magnetic-levitation train begins traction, the isolating switch QS of input switch cabinet 3 and speed-sensitive switch QF closure, charging contactor KM2 closed pair filter capacitor C1 charging, charging contactor KM2 disconnects after voltage reaches more than the 1500V, short circuit contactor KM1 closure, two inverter modules 11 begin to export modulation voltage according to the modulation instructions of unanimity, and send into the output transformer 21 of output conversion device 2.
As shown in Figure 4, during vehicle launch, perhaps behind the launch train but when not reaching inverter 1 output voltage limit, this output voltage limit (is for example determined according to the voltage of dc bus, situation to DC bus-bar voltage DC1500V, inverter 1 output voltage about 1100V that reaches the standard grade), the first main switch K1 closure of output switch apparatus 22, the second main switch K2 disconnects, this moment, output transformer 21 worked in Direct Model, two electric currents that inverter module 11 is sent into by a and x port, converge at 0 place of the centre tap device 213 of former limit winding 211 through winding ao and xo, two inverter modules 11 are according to the modulation instructions output voltage of unanimity, its phase place, size is all identical, then the electric current at 0 place of centre tap device 213 is superposed to former limit winding 211 electric currents of twice, and by centre tap device 213 places through the first main switch K1 to motor 4 outputs.This moment, the secondary winding 212 of output transformer 21 was not worked, and output transformer 21 is equivalent to reactor.
Motor 4 constantly speed-raising under inverter 1 traction, inverter 1 output voltage constantly raises simultaneously, and two inverter modules 11 keep making train obtain maximum acceleration with possible maximum current output always in this stage.When reaching on it, inverter 1 output voltage prescribes a time limit, be reduced to zero by two inverter module 11 output currents of the control of the pull-in control system on the train, output switch apparatus 22 switches, the first main switch K1 disconnects, the second main switch K2 closure, this moment, output transformer 21 worked in the transformer pattern.This latter two inverter module 11 recovers the output modulation voltage, but both output voltage phase places are opposite, size is identical, the voltage that then so is added on the output transformer 21 former limit windings 211 is the twice of single inverter module 11, draws to motor 4 outputs through the second main switch K2 after output transformer 21 boosts again.When being implemented in train and reaching certain high speed, inverter 1 improves behind the output voltage to motor 4 output three-phase high-voltages, satisfies in motor requirement to voltage when running up speed-raising down.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. urban railway magnetic suspension train traction current transformer output device, this device comprises inverter (1), the input switch cabinet (3) that is connected with the inlet circuit of described inverter (1), it is characterized in that this device also comprises the output conversion device (2) that is connected with the circuit of output terminal of described inverter (1);
The circuit of output terminal of described output conversion device (2) is connected with several external motors (4);
Described inverter (1) comprises several inverter modules (11);
Described output conversion device (2) comprises: the output transformer (21) that is connected with the circuit of output terminal of described inverter (1), and the output switch apparatus (22) that is connected with the circuit of output terminal of described output transformer (21).
2. urban railway magnetic suspension train traction current transformer output device as claimed in claim 1 is characterized in that the structure of described several inverter modules (11) is identical.
3. urban railway magnetic suspension train traction current transformer output device as claimed in claim 1 is characterized in that, the outer casing that also is arranged with of described inverter module (11); Described a plurality of inverter module (11) is arranged in the same casing, and perhaps each inverter module (11) is separately positioned on separately independently in the casing.
4. urban railway magnetic suspension train traction current transformer output device as claimed in claim 1 is characterized in that the three-phase output voltage of described several inverter modules (11) can be respectively same-phase or opposite phase.
5. urban railway magnetic suspension train traction current transformer output device as claimed in claim 1 is characterized in that circuit is connected with centre tap device (213) on the mid point of described former limit winding (211).
6. urban railway magnetic suspension train traction current transformer output device as claimed in claim 5 is characterized in that, described centre tap device (213) is gone up circuit and is connected with cable or connects row; Described cable or connection row's current capacity is not less than the twice of the former limit of output transformer winding (211).
7. urban railway magnetic suspension train traction current transformer output device as claimed in claim 1 is characterized in that the transformation ratio of described output transformer (21) is made as from 1:1 to 1:n adjustable, and n adopts greater than 1 numerical value or less than 1 numerical value.
8. urban railway magnetic suspension train traction current transformer output device as claimed in claim 5, it is characterized in that, described output switch apparatus (22) comprises first main switch (K1) that is connected with described centre tap device (213) circuit, second main switch (K2) that is connected with described secondary winding (212) high-voltage output end circuit; The circuit connection has interlocking control between described first main switch (K1) and second main switch (K2).
9. urban railway magnetic suspension train traction current transformer output device as claimed in claim 8, it is characterized in that, during launch train, or behind the launch train but when not reaching inverter (1) output voltage limit, described first main switch (K1) closure, second main switch (K2) is opened; When meeting or exceeding inverter (1) output voltage limit, described first main switch (K1) is opened, second main switch (K2) closure.
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Effective date of registration: 20150922 Address after: 200092 Shanghai City, Yangpu District Siping Road No. 1239 Patentee after: Tongji University Patentee after: Institute of Electrical Engineering of the Chinese Academy of Sciences Address before: 201204 Pudong New Area, Longyang Road, No. 2520, Patentee before: Shanghai Maglev Transportation Development Co., Ltd. Patentee before: Institute of Electrical Engineering of the Chinese Academy of Sciences |