CN108233434A - Energy reversible traction substation, method and system - Google Patents
Energy reversible traction substation, method and system Download PDFInfo
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- CN108233434A CN108233434A CN201711386793.5A CN201711386793A CN108233434A CN 108233434 A CN108233434 A CN 108233434A CN 201711386793 A CN201711386793 A CN 201711386793A CN 108233434 A CN108233434 A CN 108233434A
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
-
- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention provides a kind of energy reversible traction substation, method and system.The energy reversible traction substation includes：Four-quadrant Current transform unit, controller and DC current sensor.Four-quadrant Current transform unit is connect respectively with AC network and direct current contact net, and DC current sensor is connect with the DC side of four-quadrant Current transform unit, and DC current sensor is connect with controller, and controller is connect with four-quadrant Current transform unit.DC current sensor is used to measure the DC side electric current of four-quadrant Current transform unit, and DC side electric current is transferred to controller, and controller is used to that the DC voltage set-point of four-quadrant Current transform unit to be controlled according to specific rule with the variation of DC side electric current to change.The present invention realizes that multiple energy reversible traction substations can absorb train regenerating braking energy jointly, reduces the power rush to single traction substation, improves capacity usage ratio.
Description
Technical field
The present invention relates to rail traffic traction power supply technical field more particularly to a kind of energy reversible traction substation,
Method and system.
Background technology
Urban track traffic has become solution because of the advantages such as safety and comfort, handling capacity of passengers is big, the speed of service is fast, energy conservation and environmental protection
The preferred option of urban congestion problem.Therefore, urban track traffic is in most area fast development.
Fig. 1 is the structure diagram of existing urban track traffic tractive power supply system provided by the invention, as shown in Figure 1,
Urban track traffic tractive power supply system includes AC network, direct current contact net and multiple traction substations, each draws power transformation
Include diode rectification unit, wherein the structure of diode rectification unit is simple, dependable performance.
However, diode rectification unit can only realize the one-way flow of energy.In train traction, diode rectification unit
Alternating current, can be depressured by work and rectification is converted into direct current, and provide direct current to train.In train braking, two poles
The regenerating braking energy that train generates can not be fed back to alternating current net side by pipe Rectification Power Factor.In general, using resistance by train again
Raw braking energy consumes, and causes the serious waste of energy.
Invention content
The present invention provides a kind of energy reversible traction substation, method and system, to solve existing urban track traffic
Train regenerating braking energy on resistance waste the problem of in tractive power supply system, while ensures that train regenerating braking energy is more
A traction substation absorbs jointly, improves capacity usage ratio.
In a first aspect, the present invention provides a kind of energy reversible traction substation, including：Four-quadrant Current transform unit, control
Device and DC current sensor；Wherein
The four-quadrant Current transform unit is connect respectively with dc bus in the AC network and institute, and direct current is female in the institute
Line is connect with direct current contact net, and the DC current sensor is connect with the DC side of the four-quadrant Current transform unit, described straight
Galvanic electricity flow sensor is connect with the controller, and the controller is connect with the four-quadrant Current transform unit；
The DC current sensor is used to measuring the DC side electric current of the four-quadrant Current transform unit, and by the direct current
Side electric current is transferred to the controller；
The controller is used to control the DC voltage set-point of the four-quadrant Current transform unit with DC side electricity
The variation of stream and change.
Optionally, the controller is used to control the DC voltage of the four-quadrant Current transform unit by equation below (1)
Set-point changes with the variation of the DC side electric current：
U* dc=U1k-K·IdcFormula (1)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, U1kFor the four-quadrant Current transform unit
Floating voltage, K be train regenerating braking energy absorption coefficient, IdcDC side electric current for the four-quadrant Current transform unit.
Optionally, the size of the train regenerating braking energy absorption coefficient K values is reversible according to train and the energy
What the line resistance between type traction substation was set.
Optionally, it further includes：Direct current voltage sensor；
Wherein, the direct current voltage sensor is connect with the DC side of the four-quadrant Current transform unit, the DC voltage
Sensor is connect with the controller；
The direct current voltage sensor is used to measuring the DC voltage of the four-quadrant Current transform unit, and by the direct current
Side voltage is transferred to the controller；
The controller is additionally operable to that the DC voltage of the DC voltage and the four-quadrant Current transform unit is controlled to give
It is worth equal.
Optionally, the controller is additionally operable to control the DC voltage and the four-quadrant by equation below (2)
The DC voltage set-point of Current transform unit is equal：
Udc=U* dcFormula (2)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, UdcFor the DC voltage.
Optionally, it further includes：Diode rectification unit；
Wherein, the diode rectification unit is connected in parallel with the four-quadrant Current transform unit, the diode rectification machine
The DC side of group is connect with dc bus in the institute.
Optionally, the DC side of the four-quadrant Current transform unit is connect with dc bus in the institute.
Second aspect, the present invention provide a kind of energy reversible traction and become method for electrically, draw and become applied to energy reversible
Electric institute, the energy reversible traction substation include：Four-quadrant Current transform unit, controller and DC current sensor, institute
The method of stating includes：
The DC side electric current of the four-quadrant Current transform unit that the DC current sensor measures is transferred to the control
Device processed；
The controller controls the DC voltage set-point of the four-quadrant Current transform unit with the DC side electric current
Change and change.
Optionally, the controller controls the DC voltage of the four-quadrant Current transform unit to give by equation below (1)
Value changes with the variation of the DC side electric current：
U* dc=U1k-K·IdcFormula (1)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, U1kFor the four-quadrant Current transform unit
Floating voltage, K be train regenerating braking energy absorption coefficient, IdcDC side electric current for the four-quadrant Current transform unit.
Optionally, the size of the train regenerating braking energy absorption coefficient K values is reversible according to train and the energy
What the line resistance between type traction substation was set.
Optionally, the energy reversible traction substation further includes direct current voltage sensor, and the method further includes：
The DC voltage of the four-quadrant Current transform unit that the direct current voltage sensor measures is transferred to the control
Device processed；
The controller controls the DC voltage equal with the DC voltage set-point of the four-quadrant Current transform unit.
Optionally, the controller controls the DC voltage and the four-quadrant convertor by equation below (2)
The DC voltage set-point of group is equal：
Udc=U* dcFormula (2)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, UdcFor the DC voltage.
The third aspect, the present invention provide a kind of urban track traffic tractive power supply system, including：AC network, direct current connect
Net-fault and multiple energy reversible traction substations as described in relation to the first aspect.
Optionally, the number of the energy reversible traction substation is 3, the traction power transformation of respectively the first energy reversible
Institute, the second energy reversible traction substation and third energy reversible traction substation.
Optionally, the DC side of the first energy reversible traction substation, the second energy reversible traction become
The DC side of electric institute and the DC side of the third energy reversible traction substation in dc bus connect；
When the train is braked, train is connect with the direct current contact net, the first energy reversible traction
Electric substation, the second energy reversible traction substation and the third energy reversible traction substation absorb row jointly
Vehicle regenerating braking energy.
Energy reversible traction substation provided by the invention, method and system, the energy reversible traction substation lead to
It crosses four-quadrant Current transform unit to connect with dc bus in AC network and institute respectively, dc bus connects with direct current contact net in institute
It connects, DC current sensor is connect with the DC side of four-quadrant Current transform unit, and DC current sensor is connect with controller, direct current
The DC side electric current of the four-quadrant Current transform unit measured can be transferred to controller, and controller and four-quadrant by current sensor
Current transform unit connects, and controller can be according to the DC voltage set-point of DC side current control four-quadrant Current transform unit with direct current
The variation of side electric current and change so that the DC side of four-quadrant Current transform unit is there are a virtual equivalent resistance, so as in train
During braking, gradually increase with the train regenerating braking energy of generation so that multiple energy reversible traction substations can be total to
With absorption train regenerating braking energy.And the value of the virtual equivalent resistance is bigger, each energy reversible traction substation absorbs row
Vehicle regenerating braking energy is more balanced.The present embodiment realizes the train regenerating braking energy generated when train enters the station can be more
The process that a adjacent energy reversible traction substation absorbs jointly, solve existing urban track traffic tractive power supply system without
Method absorbs the problem of train regenerating braking energy, can not only balanced each energy reversible traction substation power rush,
It also is able to fully recycle train regenerating braking energy in urban track traffic tractive power supply system.
Description of the drawings
Fig. 1 is the structure diagram of existing urban track traffic tractive power supply system provided by the invention；
Fig. 2 is the structure diagram of energy reversible traction substation provided by the invention；
Fig. 3 is the external characteristic curve figure of four-quadrant Current transform unit provided by the invention and diode rectification unit；
Fig. 4 is the structure diagram of part components in energy reversible traction substation provided by the invention；
Fig. 5 is the external characteristics control schematic diagram that four-quadrant Current transform unit provided by the invention uses current decoupled control；
Fig. 6 is the flow chart one that energy reversible provided by the invention traction becomes method for electrically；
Fig. 7 is the flowchart 2 that energy reversible provided by the invention traction becomes method for electrically；
Fig. 8 is the structure diagram of urban track traffic tractive power supply system provided by the invention.
Specific embodiment
In general, urban track traffic tractive power supply system includes AC network, direct current contact net and multiple traction substations,
Each traction substation includes diode rectification unit.As shown in Figure 1, for convenience of description, using a traction substation as
The present embodiment is described in detail in example.
In general, in existing urban track traffic traction track system, when train enters the station braking, regenerative braking can be generated
Energy, the energy can be fallen by resistance consumption, can cause the waste of resource.In order to rationally and make full use of train regenerative braking
Therefore, in the present embodiment a kind of energy reversible traction substation can be used in energy, by the way that energy reversible is controlled to draw power transformation
In the direct current given voltage value of four-quadrant Current transform unit change in real time so that train regenerating braking energy can be multiple
Four quadrant convertor in traction substation absorbs jointly.
Fig. 2 is the structure diagram of energy reversible traction substation provided by the invention.As shown in Fig. 2, the present embodiment
Energy reversible traction substation include：Four-quadrant Current transform unit, controller and DC current sensor.Wherein four-quadrant
Current transform unit is connect respectively with dc bus in AC network and institute, and dc bus is connect with direct current contact net in institute, direct current
Flow sensor is connect with the DC side of four-quadrant Current transform unit, and DC current sensor is connect with controller, controller and four-quadrant
Limit Current transform unit connection.DC current sensor is used to measure the DC side electric current of four-quadrant Current transform unit, and DC side is electric
It is streaming to controller.Controller is used to control the DC voltage set-point of four-quadrant Current transform unit with the change of DC side electric current
Change and change.
Specifically, since the four quadrant convertor in four-quadrant Current transform unit has very high phasor power factor, relatively low
Harmonic current interference and the advantages that excellent regenerative braking performance, and four quadrant convertor can realize the bidirectional flow of energy
Dynamic, four-quadrant Current transform unit, which therefore, in the present embodiment can be used, can realize the conversion and flowing of energy.When train enters the station braking
When, by the connection of dc bus and direct current contact net and the connection of train and direct current contact net, train is in braking etc.
The regenerating braking energy generated under operating mode can be absorbed by four-quadrant Current transform unit in the present embodiment.Then, four-quadrant convertor
Train regenerating braking energy can be reverse into alternating current and boost to a certain alternating voltage (such as 35kV) by group is fed back to alternating current
Net recycle, so as to fulfill in urban track traffic tractive power supply system energy it is reversible.
Further, since four-quadrant Current transform unit can realize the two-way flow of energy and DC voltage set-point can
It adjusts, therefore, in order to enable the four-quadrant Current transform unit in multiple energy reversible traction substations can absorb train jointly again
Raw braking energy, the present embodiment can by the DC side of the control four-quadrant Current transform unit of controller there are one virtually etc.
Resistance is imitated, neither consumes train regenerating braking energy, and enable train regenerating braking energy jointly by multiple energy reversibles
Traction substation absorbs.Wherein, the model of controller and type are not limited in the present embodiment.
Further, DC current sensor can be equipped with, and straight in the DC side of four-quadrant Current transform unit in the present embodiment
Galvanic electricity flow sensor can measure out the DC side electric current of four-quadrant Current transform unit.To the type of DC current sensor in the present embodiment
Number and type do not limit.
Further, the DC side of the primary input connection four-quadrant Current transform unit of DC current sensor, passes through direct current
The DC side electric current that measurement obtains can be transferred to controller by the secondary output of current sensor.Then, controller can be according to straight
The DC voltage set-point of stream side current control four-quadrant Current transform unit changes with the variation of DC side electric current, is equivalent to four
The virtual equivalent resistance that the DC side of quadrant Current transform unit is not present in itself there are one, the virtual equivalent resistance will not both consume
Train regenerating braking energy, additionally it is possible to so that some energy reversible traction substation will not individually absorb train regenerative braking energy
Amount.When the value of virtual equivalent resistance is larger, electric current during train braking can more balancedly flow to each energy reversible and lead
Draw in electric substation, therefore, which can be regarded as to multiple energy reversible traction substations and absorb train regeneration system
The balanced index of energy.
It specifically, can be according to the big of the artificial setting train regenerating braking energy absorption coefficient of actual conditions in the present embodiment
It is small so that the DC side of four-quadrant Current transform unit realizes four-quadrant there are virtual equivalent resistance existing for one not reality
The DC voltage set-point of Current transform unit changes with the change of DC side electric current.Controller can control four-quadrant in the present embodiment
The concrete form that the DC voltage set-point of limit Current transform unit changes with the change of DC side electric current does not limit.Optionally,
Controller is used to control the DC voltage set-point of four-quadrant Current transform unit with the change of DC side electric current by equation below (1)
Change and change：
U* dc=U1k-K·IdcFormula (1)；
Wherein, U* dcFor the DC voltage set-point of four-quadrant Current transform unit, U1kZero load electricity for four-quadrant Current transform unit
Pressure, K be train regenerating braking energy absorption coefficient, IdcDC side electric current for four-quadrant Current transform unit.
Further, in formula (1), it is straight that train regenerating braking energy absorption coefficient K can regard four-quadrant Current transform unit as
Flow the virtual equivalent internal resistance of side.The DC side electric current I of four-quadrant Current transform unitdcIt can be obtained by DC current sensor measurement,
Given value, and the floating voltage U of four-quadrant Current transform unit can be regarded as1kIt is constant.In train braking, the I that measuresdcFor negative value,
The value of K is kept constant, therefore, as DC side electric current IdcWhen becoming larger, DC voltage set-point U* dcIt can be with becoming larger.Wherein, train
Regenerating braking energy absorption coefficient K values can be by artificially being set, and the present embodiment does not limit the specific size of K values.It is optional
Ground, the size of train regenerating braking energy absorption coefficient K values is according to the line between train and energy reversible traction substation
Road resistance setting.
Specifically, the resistance value that defining K value is far longer than line resistance can be set, the influence of such line resistance just becomes smaller, distance
Energy reversible traction substation farther out just can absorb the train regenerating braking energy of bigger.And K values are bigger, train braking
When electric current can more balancedly flow in each energy reversible traction substation.
Further, diode rectification unit is only included in existing multiple traction substations, therefore, it is impossible to realize
Recycling is carried out to train regenerating braking energy.And in multiple energy reversible traction substations of the present embodiment, by
Exist in the DC side of four-quadrant Current transform unit there are one virtual equivalent resistance, therefore, in train braking, as train regenerates
The braking power of braking energy increases, and the DC voltage of four-quadrant Current transform unit is given in neighbouring energy reversible traction substation
Definite value linearly increases in a certain range, so as to trigger the four-quadrant Current transform unit in adjacent energy reversible traction substation
Also it devotes oneself to work so that the train regenerating braking energy generated when train enters the station can be by multiple energy reversible traction substations
Four-quadrant Current transform unit absorb jointly.And train regenerating braking energy absorption coefficient also is able to more greatly so that each energy reversible
Traction substation absorption train regenerating braking energy is more balanced, so as to reduce the power to some energy reversible traction substation
Attack, convenient for train regenerating braking energy can in subway system cycling and reutilization, reduce that train regenerating braking energy is counter send
To the probability of urban distribution network.
Energy reversible traction substation provided in this embodiment, by four-quadrant Current transform unit respectively with AC network and
Dc bus connection in institute, dc bus is connect with direct current contact net in, DC current sensor and four-quadrant Current transform unit
DC side connection, DC current sensor connect with controller, the four-quadrant unsteady flow that DC current sensor can will measure
The DC side electric current of unit is transferred to controller, and controller is connect with four-quadrant Current transform unit, and controller can be according to direct current
The DC voltage set-point of side current control four-quadrant Current transform unit changes with the variation of DC side electric current so that four-quadrant becomes
The DC side of unit is flowed there are a virtual equivalent resistance, thus in train braking, with the train regenerative braking energy of generation
Amount gradually increases so that multiple energy reversible traction substations can absorb train regenerating braking energy jointly.And this is virtual
The value of equivalent resistance is bigger, and it is more balanced that each energy reversible traction substation absorbs train regenerating braking energy.The present embodiment is real
Having showed the train regenerating braking energy generated when train enters the station can be common by multiple adjacent energy reversible traction substations
The process of absorption solves the problems, such as that existing urban track traffic tractive power supply system can not absorb train regenerating braking energy,
Can not only balanced each energy reversible traction substation power rush, additionally it is possible to train regenerating braking energy is fully followed
Ring is utilized in urban track traffic tractive power supply system.
On the basis of above-described embodiment, the concrete structure of energy reversible traction substation in the present embodiment is carried out detailed
It describes in detail bright.
First, continuing with Fig. 2, in order to realize the function to train power supply, in the present embodiment the traction of energy reversible become
Electricity is further included：Diode rectification unit.Wherein, diode rectification unit is connected in parallel with four-quadrant Current transform unit, diode
The DC side of Rectification Power Factor is connect with dc bus in institute.
Specifically, in train traction, diode rectification unit can be used in existing traction substation in the present embodiment
Diode rectification unit, AC network (such as 35kV) can be depressured, by AC rectification for direct current (such as 750V or
1500V), and dc bus in institute is connected to, dc bus is connect with direct current contact net in institute, when train connection direct current contact
Net, just can be to train power supply.In train braking, diode rectification unit does not work.It is whole to diode in the present embodiment
The specific implementation form of stream unit does not limit, and only need to meet diode rectification unit is connected in parallel with four-quadrant Current transform unit
.
Secondly, in order to monitor the DC voltage of four-quadrant Current transform unit reality, direct current can be used in the present embodiment
Side voltage sensor.Continuing with Fig. 2, energy reversible traction substation further includes in the present embodiment：Direct current voltage sensor.
Wherein, direct current voltage sensor is connect with the DC side of four-quadrant Current transform unit, and direct current voltage sensor is connect with controller.Directly
Galvanic electricity pressure sensor is used to measure the DC voltage of four-quadrant Current transform unit, and DC voltage is transferred to controller.Control
It is equal with the DC voltage set-point of four-quadrant Current transform unit that device processed is additionally operable to control DC voltage.
Specifically, direct current voltage sensor, and direct current can be equipped in the DC side of four-quadrant Current transform unit in the present embodiment
Voltage sensor can measure out the DC voltage of four-quadrant Current transform unit.To the model of direct current voltage sensor in the present embodiment
It is not limited with type.
Further, the DC side of the primary input connection four-quadrant Current transform unit of direct current voltage sensor, passes through direct current
The DC voltage that measurement obtains can be also transferred to controller by the secondary output of voltage sensor.Then, controller can control
DC voltage is equal with the DC voltage set-point of four-quadrant Current transform unit, i.e., by the feedback of DC voltage, is applied to
The DC voltage set-point of four-quadrant Current transform unit so that the DC voltage set-point of DC voltage and four-quadrant Current transform unit
It is equal, so as to correct the DC voltage set-point of four-quadrant Current transform unit.
Further, the DC voltage of controller control DC voltage and four-quadrant Current transform unit gives in the present embodiment
It is worth equal concrete form not limit.Optionally, controller is additionally operable to control DC voltage and four by equation below (2)
The DC voltage set-point of quadrant Current transform unit is equal：
Udc=U* dcFormula (2)；
Wherein, U* dcFor the DC voltage set-point of four-quadrant Current transform unit, UdcFor DC voltage.
Further, diode arranges unit and four-quadrant Current transform unit in train in energy reversible traction substation
It works under different conditions, so as to which energy reversible traction substation can not only be by train regenerative braking energy feedback to alternating current
Net is recycled, additionally it is possible to be provided haulage capacity for train using train regenerating braking energy, be handed over so as to fulfill city rail
Energy is reversible in logical tractive power supply system.For convenience of description, the present embodiment illustrates concrete implementation mistake using below figure 3
Journey.
Fig. 3 is the external characteristic curve figure of four-quadrant Current transform unit provided by the invention and diode rectification unit.Specifically,
Under normal circumstances, during train traction, the diode in urban track traffic tractive power supply system in each traction substation is whole
Unit work is flowed, and alternating current is depressured and is converted into direct current, four-quadrant Current transform unit does not work, therefore only as whole in Fig. 3
Flow area diode rectification unit outer indicatrix 2., wherein UdoFloating voltage for diode rectification unit；UlimFor four-quadrant
The inverter voltage limits value of Current transform unit is limited, is defaulted as 1750V；A is limited work(point, and AX is limited work(curve, along the voltage of AX directions
It rises, and power remains unchanged, acquiescence limit work value is 2MW；UovFor DC voltage protection value, default value 2100V.Train braking
When, the four-quadrant Current transform unit work in each traction substation, and train regenerating braking energy is passed through into direct current contact net and is turned
The DC conversion changed into is alternating current and is sent to AC network, and diode rectification unit does not work, therefore only as inverse in Fig. 3
Become area four-quadrant Current transform unit external characteristic curve 1., wherein U1kInversion cut-in voltage for four-quadrant Current transform unit.Herein
It should be noted that for convenience of explanation, by the external characteristic curve of four-quadrant Current transform unit and diode rectification unit point in Fig. 3
It is not drawn in the left and right sides of ordinate, convenient for distinguishing different working conditions.In Fig. 3, ordinate UdcFor four-quadrant Current transform unit
DC voltage, abscissa IdcDC side electric current for four-quadrant Current transform unit.In this way, the diode in each traction substation
Rectification Power Factor and four-quadrant Current transform unit can co-ordination, specific control targe can be reached.
In a specific embodiment, it is being arranged in order to which multiple energy reversible traction substations are clearly depicted
Vehicle can absorb the process of train regenerating braking energy simultaneously when braking, with reference to Fig. 4 and Fig. 5, power transformation is drawn to energy reversible
In the concrete structures of part components be described in detail.
Fig. 4 is the structure diagram of part components in energy reversible traction substation provided by the invention, and Fig. 5 is
Four-quadrant Current transform unit provided by the invention uses the external characteristics control schematic diagram of current decoupled control.As shown in figure 4, at one
Part components in energy reversible traction substation include four quadrant convertor, controller, DC current sensor with
And direct current voltage sensor.Wherein, train regenerating braking energy is reverse into alternating current and boosts to exchange by four quadrant convertor
35kV feeds back to AC network recycling.
Specifically, there are DC current sensor and direct current voltage sensor, and direct current in the DC side of four quadrant convertor
The DC voltage that the DC side electric current and direct current voltage sensor that current sensor measures measure is output in controller,
Controller can control the DC side of four quadrant convertor according to DC side electric current in this way so that the direct current of four quadrant convertor
Voltage set-point changes, and can be fed back according to DC voltage, plays the direct current of calibration four quadrant convertor
Press the effect of set-point.
Further, as shown in figure 5, controller can receive the DC side electric current that DC current sensor measures and straight
The DC voltage that galvanic electricity pressure sensor measures.On the one hand, DC side electric current is multiplied by train regenerating braking energy absorption coefficient K,
Obtained product and the floating voltage U of four quadrant convertor1kAfter the effect of limiter, four quadrant convertor can be obtained
DC voltage set-point U* dcSo that its amplitude is in allowed limits.On the other hand, the DC voltage U by measuringdc's
Feedback, obtains DC voltage UdcWith DC voltage set-point U* dcError.Then, by a series of PI controllers adjust and
Limiter obtains given value of current valueWherein, it is rightAmplitude limit can play limitation four quadrant convertor exchange input it is (or defeated
Go out) effect of power, PI controllers can guarantee DC voltage UdcWith DC voltage set-point U* dcIt is equal.
Further, there is AC current sensor in the exchange side of four quadrant convertor, can detect three are intersecting
Flow current signal ia,ib,icIt is input in alternating current closed loop controller, and also by given value of current valueIt is input to alternating current
In closed loop controller, the common ac-side current for being used for controlling four quadrant convertor.Finally, alternating current closed loop controller is defeated
Go out signal and driving pulse control four quadrant convertor is obtained by PWM pulsewidth modulations.
Fig. 6 is the flow chart one that energy reversible provided by the invention traction becomes method for electrically.The present embodiment energy reversible
Traction becomes method for electrically and is applied to energy reversible traction substation, and energy reversible traction substation includes：Four-quadrant convertor
Group, controller and DC current sensor.It can include as shown in fig. 6, the traction of the present embodiment energy reversible becomes method for electrically：
S101, the DC side electric current for the four-quadrant Current transform unit that DC current sensor measures is transferred to controller.
S102, controller control the DC voltage set-point of four-quadrant Current transform unit to become with the variation of DC side electric current
Change.
Specifically, four-quadrant Current transform unit is obtained by an input measurement of DC current sensor in the present embodiment
DC side electric current, and DC side electric current is input to by controller by the secondary output of DC current sensor.Then, controller
Changed according to the DC voltage set-point of DC side current control four-quadrant Current transform unit with the variation of DC side electric current, made
Obtain the virtual equivalent resistance that the DC side of four-quadrant Current transform unit is not present in itself there are one.Therefore, it is more when train braking
A energy reversible traction substation can absorb train regenerating braking energy simultaneously.
Further, the present embodiment can to by controller control four-quadrant Current transform unit DC voltage set-point with
The variation of DC side electric current and the mode that changes do not limit.Optionally, controller controls four-quadrant to become by equation below (1)
The DC voltage set-point of stream unit changes with the variation of DC side electric current：
U* dc=U1k-K·IdcFormula (1)；
Wherein, U* dcFor the DC voltage set-point of four-quadrant Current transform unit, U1kZero load electricity for four-quadrant Current transform unit
Pressure, K be train regenerating braking energy absorption coefficient, IdcDC side electric current for four-quadrant Current transform unit.
Further, in formula (1), train regenerating braking energy absorption coefficient K can regard four-quadrant Current transform unit as
Virtual equivalent internal resistance.The DC side electric current I of four-quadrant Current transform unitdcIt can be obtained, can seen by DC current sensor measurement
As given value, and the floating voltage U of four-quadrant Current transform unit1kIt is constant.In train braking, the I that measuresdcFor negative value, K's
Value is kept constant, therefore, as DC side electric current IdcWhen becoming larger, DC voltage set-point U* dcIt can be with becoming larger.Wherein, train is again
Raw braking energy absorption coefficient K values can be by artificially being set, and the present embodiment does not limit the specific size of K values.Optionally,
The size of train regenerating braking energy absorption coefficient K values is according to the line electricity between train and energy reversible traction substation
Resistance setting.
Specifically, the resistance value that defining K value is far longer than line resistance can be set, the influence of such line resistance just becomes smaller, distance
Energy reversible traction substation farther out just can absorb the train regenerating braking energy of bigger.And K values are bigger, train braking
When electric current can more balancedly flow in each energy reversible traction substation.
Further, on the basis of described in above-mentioned Fig. 6, in order to monitor the direct current of four-quadrant Current transform unit reality
Side voltage, energy reversible traction substation further include direct current voltage sensor, and the present embodiment energy reversible is led with reference to Fig. 7
The specific implementation for drawing change method for electrically is described in detail.Fig. 7 becomes method for electrically for energy reversible provided by the invention traction
Flowchart 2, as shown in fig. 7, the present embodiment energy reversible traction become method for electrically may also include：
S201, the DC voltage of four-quadrant Current transform unit that direct current voltage sensor measures is transferred to controller.
S202, controller control DC voltage are equal with the DC voltage set-point of four-quadrant Current transform unit.
Specifically, four-quadrant Current transform unit is obtained by an input measurement of direct current voltage sensor in the present embodiment
DC voltage, and DC voltage is input to by controller by the secondary output of direct current voltage sensor.Then, controller
It is equal with DC voltage according to the DC voltage set-point of DC voltage control four-quadrant Current transform unit, it corrects and adjusts four
The DC voltage set-point of quadrant Current transform unit.
Further, the DC voltage of controller control DC voltage and four-quadrant Current transform unit is given in the present embodiment
The equal concrete form of definite value does not limit.Optionally, controller controls DC voltage and four-quadrant by equation below (2)
The DC voltage set-point of Current transform unit is equal：
Udc=U* dcFormula (2)；
Wherein, U* dcFor the DC voltage set-point of four-quadrant Current transform unit, UdcFor DC voltage.
Energy reversible traction provided in this embodiment becomes method for electrically, can will be measured by DC current sensor four
The DC side electric current of quadrant Current transform unit is transferred to controller, and controller can be according to DC side current control four-quadrant unsteady flow
The DC voltage set-point of unit changes with the variation of DC side electric current so that there are one for the DC side of four-quadrant Current transform unit
A virtual equivalent resistance, so as in train braking, gradually increase with the train regenerating braking energy of generation so that Duo Geneng
Amount reversible traction substation can absorb train regenerating braking energy jointly, and adjacent energy reversible traction substation also can
It is enough to absorb train regenerating braking energy simultaneously.And the value of the virtual equivalent resistance is bigger, each energy reversible traction substation is inhaled
It is more balanced to receive train regenerating braking energy.The present embodiment realizes the train regenerating braking energy generated when train enters the station can
By the process that multiple adjacent energy reversible traction substations absorb jointly, solves existing urban track traffic traction power supply system
System the problem of can not absorbing train regenerating braking energy, can not only balanced each energy reversible traction substation power punching
It hits, additionally it is possible to fully recycle train regenerating braking energy in urban track traffic tractive power supply system.
Fig. 8 is the structure diagram of urban track traffic tractive power supply system provided by the invention.As shown in figure 8, this reality
A urban track traffic tractive power supply system is applied to include：AC network, direct current contact net and multiple energy as described above can
Inverse type traction substation.
Specifically, the number of energy reversible traction substation can be arbitrary in the present embodiment, usually by the line of train
Road length determines that general 2-3 kilometers sets an energy reversible traction substation.The present embodiment does not limit this.
Optionally, the number of energy reversible traction substation is 3, respectively the first energy reversible traction substation,
Second energy reversible traction substation and third energy reversible traction substation.
Optionally, the DC side of the first energy reversible traction substation, the second energy reversible traction substation it is straight
The DC side for flowing side and third energy reversible traction substation is connect with dc bus in institute；
When train is braked, train is connect with direct current contact net, the first energy reversible traction substation, the second energy
Amount reversible traction substation and third energy reversible traction substation absorb train regenerating braking energy jointly.
Specifically, since the DC side of the four-quadrant Current transform unit in each energy reversible traction substation can all pass through control
The control action of device processed and there are a virtual equivalent resistances so that each energy reversible traction substation can absorb row jointly
The train regenerating braking energy that vehicle generates when braking.
Further, the present embodiment does not limit the number of energy reversible traction substation.When energy reversible is led
When the number for drawing electric substation is 3, become by the DC side of the first energy reversible traction substation, the traction of the second energy reversible
The DC side of electric institute and the DC side of third energy reversible traction substation are connect with dc bus in institute, in direct current
Busbar is connect with direct current contact net, when train is connect with direct current contact net, just can realize that the traction of the first energy reversible becomes
Electric institute, the second energy reversible traction substation and third energy reversible traction substation are absorbed jointly under the operating modes such as train
The train regenerating braking energy of generation.And then it is led respectively by the first energy reversible traction substation, the second energy reversible
The four-quadrant Current transform unit drawn in electric substation and third energy reversible traction substation is converted into alternating current and boosts
AC network recycling is fed back to a certain alternating voltage (such as 35kV).
Urban track traffic tractive power supply system provided in this embodiment can be used for including the energy of how each the present embodiment
The technical solution of reversible traction substation is connected by four-quadrant Current transform unit with dc bus in AC network and institute respectively
It connects, dc bus is connect with direct current contact net in institute, and DC current sensor is connect with the DC side of four-quadrant Current transform unit, directly
Galvanic electricity flow sensor is connect with controller, and DC current sensor can be by the DC side electric current of the four-quadrant Current transform unit measured
Controller is transferred to, and controller is connect with four-quadrant Current transform unit, controller can be according to DC side current control four-quadrant
The DC voltage set-point of Current transform unit changes with the variation of DC side electric current so that the DC side of four-quadrant Current transform unit is deposited
In a virtual equivalent resistance, thus in train braking, gradually increase with the train regenerating braking energy of generation so that more
A energy reversible traction substation can absorb train regenerating braking energy jointly.And the value of the virtual equivalent resistance is bigger,
It is more balanced that each energy reversible traction substation absorbs train regenerating braking energy.The present embodiment is realized to be produced when train enters the station
The process that raw train regenerating braking energy can jointly be absorbed by multiple adjacent energy reversible traction substations solves existing
There is the problem of urban track traffic tractive power supply system can not absorb train regenerating braking energy, it can not only balanced each energy
The power rush of reversible traction substation, additionally it is possible to fully recycle train regenerating braking energy in urban track traffic
In tractive power supply system.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Aforementioned program can be stored in a computer read/write memory medium.The journey
Sequence when being executed, performs the step of including above-mentioned each method embodiment；And aforementioned storage medium includes：ROM, RAM, magnetic disc or
The various media that can store program code such as person's CD.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of energy reversible traction substation, which is characterized in that including：Four-quadrant Current transform unit, controller and direct current
Current sensor；Wherein
The four-quadrant Current transform unit is connect respectively with dc bus in AC network and institute, dc bus and direct current in the institute
Contact net connects, and the DC current sensor is connect with the DC side of the four-quadrant Current transform unit, and the direct current is spread
Sensor is connect with the controller, and the controller is connect with the four-quadrant Current transform unit；
The DC current sensor is used to measure the DC side electric current of the four-quadrant Current transform unit, and the DC side is electric
It is streaming to the controller；
The controller is used to control the DC voltage set-point of the four-quadrant Current transform unit with the DC side electric current
Change and change.
2. energy reversible traction substation according to claim 1, which is characterized in that the controller is used for by such as
Lower formula (1) controls the DC voltage set-point of the four-quadrant Current transform unit to become with the variation of the DC side electric current
Change：
U* dc=U1k-K·IdcFormula (1)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, U1kZero load for the four-quadrant Current transform unit
Voltage, K be train regenerating braking energy absorption coefficient, IdcDC side electric current for the four-quadrant Current transform unit.
3. energy reversible traction substation according to claim 2, which is characterized in that the train regenerating braking energy
The size of absorption coefficient K values is set according to the line resistance between train and the energy reversible traction substation.
4. energy reversible traction substation according to claim 1, which is characterized in that further include：DC voltage senses
Device；
Wherein, the direct current voltage sensor is connect with the DC side of the four-quadrant Current transform unit, the DC voltage sensing
Device is connect with the controller；
The direct current voltage sensor is used to measure the DC voltage of the four-quadrant Current transform unit, and the DC side is electric
Pressure is transferred to the controller；
The controller is additionally operable to control the DC voltage set-point phase of the DC voltage and the four-quadrant Current transform unit
Deng.
5. energy reversible traction substation according to claim 4, which is characterized in that the controller is additionally operable to pass through
Equation below (2) controls the DC voltage equal with the DC voltage set-point of the four-quadrant Current transform unit：
Udc=U* dcFormula (2)；
Wherein, U* dcFor the DC voltage set-point of the four-quadrant Current transform unit, UdcFor the DC voltage.
6. energy reversible traction substation according to claim 1, which is characterized in that further include：Diode rectification machine
Group；
Wherein, the diode rectification unit is connected in parallel with the four-quadrant Current transform unit, the diode rectification unit
DC side is connect with dc bus in the institute.
7. energy reversible traction substation according to claim 1, which is characterized in that the four-quadrant Current transform unit
DC side is connect with dc bus in the institute.
8. a kind of energy reversible traction becomes method for electrically, which is characterized in that applied to energy reversible traction substation, the energy
Amount reversible traction substation includes：Four-quadrant Current transform unit, controller and DC current sensor, the method includes：
The DC side electric current of the four-quadrant Current transform unit that the DC current sensor measures is transferred to the controller；
The controller controls the DC voltage set-point of the four-quadrant Current transform unit with the variation of the DC side electric current
And change.
9. a kind of urban track traffic tractive power supply system, which is characterized in that including：AC network, direct current contact net and more
A such as claim 1-7 any one of them energy reversible traction substations.
10. system according to claim 9, which is characterized in that the number of the energy reversible traction substation is 3,
Respectively the first energy reversible traction substation, the second energy reversible traction substation and the traction of third energy reversible
Electric substation.
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| CN109103948A (en) * | 2018-08-02 | 2018-12-28 | 北京千驷驭电气有限公司 | Urban track traffic traction substation control method and system |
| WO2020010499A1 (en) * | 2018-07-10 | 2020-01-16 | 北京千驷驭电气有限公司 | Train traction power supply device and system, and control method |
| CN111313431A (en) * | 2018-12-11 | 2020-06-19 | 西安许继电力电子技术有限公司 | Subway traction power supply system and reactive compensation control method and device thereof |
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| CN112671041A (en) * | 2021-01-14 | 2021-04-16 | 徐州地铁集团有限公司 | Direct-current voltage control method of rail transit bidirectional converter |
| CN114221333A (en) * | 2021-12-10 | 2022-03-22 | 江苏晨大电气股份有限公司 | Intelligent network voltage control method, device and system for rail transit bidirectional converter |
| CN115675191A (en) * | 2023-01-04 | 2023-02-03 | 新誉轨道交通科技有限公司 | Train-ground joint control energy management method, system, equipment and storage medium |
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