CN209200956U - A kind of high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system - Google Patents
A kind of high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system Download PDFInfo
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- CN209200956U CN209200956U CN201822124908.XU CN201822124908U CN209200956U CN 209200956 U CN209200956 U CN 209200956U CN 201822124908 U CN201822124908 U CN 201822124908U CN 209200956 U CN209200956 U CN 209200956U
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Abstract
The utility model discloses a kind of high-power thyristor type traction rectifiers to brake inversion Bidirectional variable-flow system, the system includes AC switch cubicle, phase-shifting transformer, thyristor bidirectional current transformer, direct-current switch cabinet, isolating switch cabinet, thyristor bidirectional current transformer includes rectification and inversion unit in parallel, wherein, rectification (inversion) unit includes the filtering being sequentially connected in series and reactive power compensator, auto-transformer, thyristor rectifier (inversion) device.The utility model Bidirectional variable-flow system integrate energy feedback, traction power supply, stablize network pressure, to improve functions, the comprehensive cost performances of system such as power supply quality, overload capacity is strong high.
Description
Technical field
The utility model relates to a kind of high-power thyristor type traction rectifiers to brake inversion Bidirectional variable-flow system, belong to city
Technical field is absorbed and utilized in rail transit train regenerating braking energy.
Background technique
Currently, subway train is using motor-car and trailer mixed marshalling mode.During train braking, motor-car itself
Preferentially use electric braking, through calculating electric braking force deficiency situation when, supplied first by the mechanical braking of trailer, secondly deficiency
In the case of supplied by the mechanical braking of motor-car, to guarantee enough brake force.The mode of this empty cooperation braking of electricity may be implemented
During train braking kinetic energy to electric energy conversion, but since electric power supply system for subway is using two poles of 12 pulse waves or 24 pulse waves
Pipe uncontrollable rectifier power supply mode, therefore the energy of train feedback can only be in the train absorption of traction state by other, not
AC network can be fed back to by traction substation.When the departure interval is smaller, the absorbed probability of regenerating braking energy will
It is very low, and when regenerating braking energy is not fully absorbed, remaining regenerating braking energy will will lead to direct current net voltage
Lifting.In urban rail transit in China system, about 15% braking energy is utilized by other vehicles when train braking,
Remaining about 25% regeneration energy is consumed by braking resistor, this not only wastes the energy, but also resistive dissipation also needs
Further consume energy.If the energy that this part is braked resistance consumption can be recycled, fractional energy savings is considerable.
For the processing of regeneration energy, often consider from two angles.First is that passing through the car-mounted device of train itself
Complete the processing of energy, i.e. vehicular；Second is that the processing of energy is completed by the ground installation on traction substation or route,
That is ground type.In the past few decades, vehicle-mounted resistance and earth resistance become railcar because simple, reliable, easy to maintain
The primary selection of manufacturer and metro operation company.Which converts thermal energy consumption for energy by resistance and dissipates, but and is not implemented
Regenerate the reasonable utilization of energy.With the rapid development of electronic power conversion device, replace original " processing mode ", and changes
Have become scientific research personnel and the in the industry Main way of business research exploitation for " mode is absorbed and utilized ".According to regenerative braking energy
Principle difference is absorbed and utilized in amount, generally will " mode can be absorbed and utilized " and be divided into can present it is absorption with energy stores formula.Its
In, can present absorption is the principle for utilizing inverter, realizes the conversion of direct current to exchange by power electronic equipment, and then will remain
Remaining regenerative braking energy feedback is to AC network；Energy stores formula then uses certain storage device (super capacitor, flywheel, electricity
Pond, superconductor etc.) remaining regenerating braking energy is stored, and it is discharged under suitable operating condition.
Currently, accumulation energy type regenerating braking energy absorption plant mainly uses IGBT inverter by the regenerating braking energy of train
It is absorbed into large value capacitor group or freewheel unit.When thering is train starting, acceleration to need to take stream in the section that powers, the device
Stored electric energy is discharged and recycled.The investment of super capacitor energy storage device is larger, while to super capacitor
Energy density, power density, security performance, service life, the reliability of energy storage device have higher requirements.Flywheel energy storage is train braking
The energy stores generated in the process are converted into electric energy when train needs to take stream and discharge in the flywheel of rotation；Disadvantage
It is system complex, space requirement is big, and high reliablity is in the technical research stage.Inversion feedback type regenerative electric energy utilizes device
DC side is connected with the rectifier DC bus in traction substation, and alternating current inlet wire is connected on AC network, by regenerative electric energy
It is reverse into industrial-frequency alternating current and is fed back to AC network.This scheme is more advantageous for the flowing and utilization of energy, is following development
Trend.
Currently, the effect flowed is not achieved in face of two groups of power sources in parallel, solution is often on hardware by every group
The DC side series smoothing reactor of power supply plays the role of paralleing reactor or directlys adopt paralleing reactor eliminating
The voltage difference of two power supplys makes each group power supply shared load current to realize parallel current-sharing.But what this method needed
The inductance of reactor is larger and the larger cost of volume is very high, and only it is unreliable that dependence solves equal flow problem from hardware is also
It is uneconomic, therefore be necessary from the control method that software controlling strategies study parallel current-sharing.Currently, with electric power electricity
The capacity of sub-device constantly increases, and brings more and more quality problems, static reactive power compensation and dynamic passive compensation to power grid
Form cannot filter out harmonic wave well, because the invention can be applicable in the filter reactive compensation of large capacity rectification and inverter simultaneously
Device is most important.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of high-power thyristor type traction rectifiers to brake inversion
Bidirectional variable-flow system collects energy feedback, traction power supply, stablizes network pressure, improves the functions such as power supply quality, overload capacity is strong in one
Body, the comprehensive cost performance of system are high.
The utility model uses following technical scheme to solve above-mentioned technical problem:
A kind of high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system, the system include AC switch cubicle,
Phase-shifting transformer, thyristor bidirectional current transformer, direct-current switch cabinet, isolating switch cabinet, the thyristor bidirectional current transformer packet
Include rectification and inversion unit in parallel, wherein Rectification Power Factor includes the filtering being sequentially connected in series and reactive power compensator, self coupling transformation
Device, thyristor rectifier device, inversion unit include the filtering being sequentially connected in series and reactive power compensator, auto-transformer, thyristor
Inverter；
The source side winding of the phase-shifting transformer is connected by AC switch cubicle with middle pressure AC network, in Rectification Power Factor
Filtering and reactive power compensator, the filtering in inversion unit and reactive power compensator respectively with the valve side winding phase of phase-shifting transformer
Even, the exchange side of thyristor inversion or fairing passes through auto-transformer, filtering and reactive power compensator and phase-shifting transformer
It is connected, the DC side of thyristor inversion or fairing is connected by direct-current switch cabinet with direct current positive bus, and disconnecting switch is passed through
Cabinet is connected with direct current negative busbar.
As a kind of preferred embodiment of the utility model, the thyristor rectifier device includes two 12 pulse waves in parallel
Thyristor current transformer, each 12 pulse wave thyristor current transformer include two groups of phase-shifting full-bridge thyristor current transforming units in parallel.
As a kind of preferred embodiment of the utility model, the thyristor inverter includes two 12 pulse waves in parallel
Thyristor current transformer, each 12 pulse wave thyristor current transformer include two groups of phase-shifting full-bridge thyristor current transforming units in parallel.
As a kind of preferred embodiment of the utility model, the thyristor rectifier device is 24 pulse wave thyristor traction rectifiers
Device.
As a kind of preferred embodiment of the utility model, the thyristor inverter is that 24 pulse wave thyristors can present inversion
Device.
The utility model compared with the prior art by using the above technical solution, has following technical effect that
1, the utility model uses Bidirectional variable-flow technical substitution conventional rectifier unit, completes rectification and two kinds of functions of inversion.
In train braking, the braking resistor and mechanical system of train by regenerative braking energy feedback to AC network, can be greatly reduced
The effective recycling of train regenerating braking energy is realized in dynamic use；When train is outbound, electric energy can be provided for train, completely
It can replace a set of Rectification Power Factor, for the energy back feed device of pure inversion function, utilization rate of equipment and installations is higher.
2, the utility model thyristor bidirectional current transformer uses Thyristor, the single tube rated current of thyristor and big
Power diode is suitable, and overload capacity is stronger, is suitable for higher power configuration scheme, compared with IGBT can present scheme, cost
Low, short-circuit capacity is strong, and control program is relatively easy, and natural cooling, maintenance workload is small, and the high problem of harmonic content can lead to
Increase phase-shifting transformer is crossed to be filtered to solve.
3, the utility model effectively eliminates harmonic wave, power grid quality is significantly using the compensation filter device scheme being association of activity and inertia
Increase, realizes power factor: > 0.99 (under rated power) and Current harmonic distortion rate :≤3% technical requirements.
Detailed description of the invention
Fig. 1 is the overall architecture of the utility model high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system
Figure.
Fig. 2 is thyristor rectifier (inversion) schematic device.
Fig. 3 is the parallel extended scheme schematic diagram of 12 pulse wave thyristor current transformers.
Fig. 4 is 12 pulse wave parallel running waveform diagrams.
Fig. 5 is that the utility model two close cycles PI adjusts sharing control schematic diagram.
Specific embodiment
The embodiments of the present invention is described below in detail, the example of the embodiment is shown in the accompanying drawings.Below
It is exemplary by reference to the embodiment that attached drawing describes, is only used for explaining the utility model, and cannot be construed to this reality
With novel limitation.
As shown in Figure 1, high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system mainly by AC switch cubicle,
The composition such as phase-shifting transformer, thyristor bidirectional current transformer, direct-current switch cabinet, cathode isolating switch cabinet.Thyristor Bidirectional variable-flow
System has two kinds of purposes of rectification and inversion, can by train braking energy feedback to middle pressure AC network to reach energy-efficient purpose,
AC network can be transported to DC bus, provide electric energy and stable DC busbar voltage for train traction, utilize the mistake of itself
Loading capability can temporarily replace out of order Rectification Power Factor, to guarantee that whole route operates normally.Converter plant is using thyristor member
Part solves the problems, such as that current IGBT product current-carrying capability is low, and with spy at low cost, control is simple and reliable, maintenance is small
Point is current advanced train braking regeneration energy recycling system.
System composition: the source side winding of phase-shifting transformer is connected by AC switch cubicle with middle pressure AC network；Valve side around
Group is connected by thyristor bidirectional current transformer and DC switch equipment (direct-current switch cabinet, isolating switch cabinet) with DC bus.
Thyristor bidirectional current transformer includes two groups of units of rectification and inversion in parallel, and every group of unit includes the filtering for being sequentially connected in series arrangement
With reactive power compensator, auto-transformer, thyristor rectifier or inverter；The exchange side of inversion (rectification) device passes through self coupling
Transformer, filtering and reactive power compensator are connected with phase-shifting transformer；The DC side of inversion (rectification) device passes through dc switch
Cabinet is connected with direct current positive bus, is connected by isolating switch cabinet with direct current negative busbar.
This system collection traction rectifier and braking inversion dual function, traction rectifier is for launch train and operation power supply, system
Dynamic inversion is used for by train braking energy feedback to middle pressure network, to save electric energy.It is two-way that thyristor-type traction rectifier brakes inversion
Whether converter system has train to be in regeneration electric braking shape according to each sensor detection signal on comprehensive descision DC grid
State, when confirming that train is in regenerative braking state and needs to absorb energy, system starts absorption process.Inverter is machine
The energy that vehicle generates when braking is converted into power grid automatically tracking busbar voltage, and power to the load with width voltage with frequency, will again
Raw energy recycles.Train power supply demand is monitored by way of reading locomotive enabling signal or axis-counting device detection signal, is arranged
When vehicle starting operation, thyristor-type traction rectifier brakes inversion Bidirectional variable-flow system and replaces existing one group of fairing, realizes
Train operation function of supplying power.
Specific steps:
1) monitoring train power supply demand by way of reading locomotive enabling signal or axis-counting device detection signal (can also lead to
The current value for crossing the intelligent LTU line test unit detection current supply circuit built in direct-current switch cabinet, judges train power supply demand with this
State), when launch train is run, breaker closing in direct-current switch cabinet, and meanwhile shunt tripping isolating switch cabinet and AC switch cubicle, shape
At current supply circuit.Middle pressure alternating current AC35kV exports AC1180V alternating current by phase-shifting transformer, by filtering and reactive compensation
After device filtering, voltage AC1180V is increased to AC1630V by auto-transformer, last 24 pulse wave rectifier unit will
AC1630V rectifying conversion is DC1500V direct current, is sent to busbar voltage for train operation via direct-current switch cabinet.
2) direct current net voltage is detected by voltage sensor, when the braking energy that the train in regenerative braking operating condition generates
When cannot be absorbed completely by the electrical equipment of other vehicles and Ben Che, direct current net voltage will rise quickly, and network pressure rises to centainly
After degree, the work of 24 pulse wave rectifier unit commitments sponges extra regenerative current, and be fed back to middle pressure network, with to greatest extent
Ground recycles the energy regenerating of regenerative braking.The d-c bus voltage value that the voltage sensor detection of DC bus is arranged in passes
It is sent to the controller that direct-current switch cabinet is set, the voltage value that controller will test is compared with threshold value, if detected
Voltage value be more than threshold value, then start 24 pulse wave inversion units, at this point, breaker closing in direct-current switch cabinet, while shunt tripping every
From switchgear and AC switch cubicle, feeding circuit is formed, direct current is changing into alternating current through inversion unit by braking energy, and is led to
Auto-transformer is crossed, filtering and reactive power compensator and phase-shifting transformer are converted to power grid with frequency with width voltage, realize again
The recycling of raw braking energy.
Thyristor is half control type power electronic devices, its operating condition is as follows: 1) thyristor bears reversed anode voltage
When, regardless of which kind of voltage gate pole bears, thyristor is all in reverse blocking state；2) when thyristor bears positive anode voltage,
Only in the case where gate pole bears forward voltage, thyristor is just connected, and at this moment thyristor is in forward conduction state, and here it is crystalline substances
The lock properties of flow of brake tube, i.e. controllable characteristics；3) thyristor is in conducting, as long as there is certain positive anode voltage, no matter
How is gate voltage, and thyristor is held on, i.e., after turn on thyristors, gate pole is ineffective, and gate pole only plays trigger action；4) brilliant
Brake tube is in conducting, when main circuit voltage (or electric current) is reduced to close to zero, thyristor shutdown.
According to the working characteristics of thyristor it is found that the energy flow characteristic of thyristor mould group has one-way, thus it is two-way
Current transformer work is being drawn and is being needed under inverter mode using different current transformer mould groups.High-power converter is that bivector traction becomes
The core of electric power station system is mainly made of 24 pulse wave thyristor traction rectifier devices and 24 pulse wave thyristor energy fed inverters.
As shown in Fig. 2, by taking 24 pulse wave thyristor traction rectifier devices (i.e. thyristor rectifier device) as an example, by two 12 pulse waves
Thyristor current transformer compose in parallel, the thyristor current transformer of each 12 pulse wave is by two groups of parallel connection phase-shifting full-bridge thyristor variables again
Flow unit composition.As shown in figure 3, being the parallel extended scheme schematic diagram of current transformer.As shown in figure 4, being 12 pulse wave parallel running waves
Shape figure.
Realize large capacity bidirectional converter advantage in series and parallel using Thyristor:
1) due to using diode uncontrollable rectifier mode, DC bus-bar voltage is uncontrollable, the case where load changes greatly
Under easily cause the fluctuation of direct current network pressure, influence Train Control performance.
2) IGBT can present device per se with rectification function, therefore have correlative study person and expert to propose to open
IGBT can present the rectification function of device, realize the two-way flow of energy.One is provided by IGBT rectification function in train traction
Determine haulage capacity, stable DC network pressure.But since subway power supply standard requirements fairing has certain overload capacity (mistake
Carry multiple and overload time requirement are as follows: 1.5 times overload time 2 hours, 3 times of overload times 1 minute), because of the mistake of IGBT device
Loading capability is very low, and IGBT can present the target that device is difficult to realize stable DC bus when overloading, this just needs to be significantly increased
The rated capacity of IGBT fairing causes the rated capacity of device to be far longer than capacity in actual use, cause device at
This is sharply increased.
Because the single tube rated current of thyristor device is suitable with heavy-duty diode, compared with IGBT, equal-wattage
Single component is bigger by the large capacity commutation inversion installed capacity formed in series and parallel, and overload capacity is stronger, so using brilliant
Brake tube element can well solve overload problem, while realize the controllable target of busbar voltage.
It is a significant trend of power supply high-power development using multi-group power parallel output.Under equal-wattage grade,
During two groups of power sources in parallel are run, since the output of factors will cause two groups of power supplys such as hardware parameter is not quite identical is special
Property it is not fully identical, power device on the lower one group of power supply bridge arm of output voltage due to bear two groups of reversed power supplys it
Between voltage difference and ended, lead to only output voltage higher one group of power supply operation and the effect flowed be not achieved, make electricity
Source parallel running failure.Solve the problems, such as the flat wave reactance that can connect by the DC side in every group of power supply on this method hardware
Device plays the role of paralleing reactor or directlys adopt paralleing reactor eliminating the voltage difference of two power supplys, makes each group power supply
Shared load current is to realize parallel current-sharing.But the inductance of reactor that needs of this method is larger and volume compared with
Big cost is very high, is also only uneconomic by solve equal flow problem from hardware is unreliable, therefore from software control plan
It slightly sets out and studies the control method of parallel current-sharing and be necessary.
Traditional current equalizing method main analog control method namely design simulation circuit flows to realize, main includes output
Method, average current value method and maximum current value method etc., the response speed of the analoglike current-sharing control method is arranged in impedance method, principal and subordinate
Comparatively fast, but due to the intrinsic device aging of analog element, temperature drift and be not easy the problems such as extending, especially hardware circuit once at
Type then fix by control method, and the flexible control parameter that changes cannot be required to be arranged according to different control, be unfavorable for present generation power supplies
The requirement of automation and intelligentized control method, therefore large power supply current sharing control method is become using digital control method
Another major way.This power supply adjusts sharing control using two close cycles number PI in two group of 12 arteries and veins rectifier power source parallel connection
Method is as shown in Figure 5 to achieve the purpose that two groups of power sources in parallel, control principle.
By being connected on the current transformers of every group of 12 pulse wave rectifier power supply DC sides for actual current valueFeed back to control
Device processed, controller is according to given current value IrefAnd value of feedbackEach group power supply is exported by digital pi regulator closed-loop control
Trigger pulse to adjust the output current value of every group of power supply, reach the current stabilization control of every group of power supply.This kind of mode can be
Line keeps quite high stream essence while changing continuous non differential regulation of the stream output valve of power-supply system to realize electric current
Degree occurs remaining to quick response in the case where larger range disturbance and completes the constant current parallel output of power-supply system in load.
Above embodiments are only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this
Enclose, it is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within this reality
Within the scope of novel protected.
Claims (5)
1. a kind of high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system, which is characterized in that the system includes handing over
Flow switchgear, phase-shifting transformer, thyristor bidirectional current transformer, direct-current switch cabinet, isolating switch cabinet, the two-way change of thyristor
Stream device includes in parallel rectification and inversion unit, wherein Rectification Power Factor include the filtering being sequentially connected in series and reactive power compensator,
Auto-transformer, thyristor rectifier device, inversion unit include the filtering being sequentially connected in series and reactive power compensator, self coupling transformation
Device, thyristor inverter；
The source side winding of the phase-shifting transformer is connected by AC switch cubicle with middle pressure AC network, the filtering in Rectification Power Factor
With in reactive power compensator, inversion unit filtering and reactive power compensator be connected respectively with the valve side winding of phase-shifting transformer,
The exchange side of thyristor inversion or fairing passes through auto-transformer, filtering and reactive power compensator and phase-shifting transformer phase
Even, the DC side of thyristor inversion or fairing is connected by direct-current switch cabinet with direct current positive bus, passes through isolating switch cabinet
It is connected with direct current negative busbar.
2. high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system according to claim 1, which is characterized in that
The thyristor rectifier device includes two 12 pulse wave thyristor current transformers in parallel, and each 12 pulse wave thyristor current transformer includes
Two groups of phase-shifting full-bridge thyristor current transforming units in parallel.
3. high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system according to claim 1, which is characterized in that
The thyristor inverter includes two 12 pulse wave thyristor current transformers in parallel, and each 12 pulse wave thyristor current transformer includes
Two groups of phase-shifting full-bridge thyristor current transforming units in parallel.
4. high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system according to claim 1, which is characterized in that
The thyristor rectifier device is 24 pulse wave thyristor traction rectifier devices.
5. high-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system according to claim 1, which is characterized in that
The thyristor inverter is 24 pulse wave thyristor energy fed inverters.
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| CN201822124908.XU CN209200956U (en) | 2018-12-18 | 2018-12-18 | A kind of high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450286A (en) * | 2018-12-18 | 2019-03-08 | 镇江大全赛雪龙牵引电气有限公司 | High-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system and control method |
| CN112737368A (en) * | 2020-12-09 | 2021-04-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-performance rectifying power supply device |
-
2018
- 2018-12-18 CN CN201822124908.XU patent/CN209200956U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450286A (en) * | 2018-12-18 | 2019-03-08 | 镇江大全赛雪龙牵引电气有限公司 | High-power thyristor type traction rectifier brakes inversion Bidirectional variable-flow system and control method |
| CN112737368A (en) * | 2020-12-09 | 2021-04-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-performance rectifying power supply device |
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