CN109050352A - Through homo-phase traction power supply system, traction substation and its method for controlling power supply - Google Patents
Through homo-phase traction power supply system, traction substation and its method for controlling power supply Download PDFInfo
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- CN109050352A CN109050352A CN201810749874.5A CN201810749874A CN109050352A CN 109050352 A CN109050352 A CN 109050352A CN 201810749874 A CN201810749874 A CN 201810749874A CN 109050352 A CN109050352 A CN 109050352A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
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Abstract
The present invention relates to power control technology field, a kind of through homo-phase traction power supply system, traction substation and its method for controlling power supply are specifically provided, it is intended to the technical issues of how solving to electric locomotive reliable power supply.For this purpose, the present invention provides the traction substations including multiple electrical energy changers.Specifically, electrical energy changer includes single-phase transformer and electrical energy transformer, different from two in the preset power grid phase line connections respectively of the high-voltage winding of each single-phase transformer, the low pressure winding of each single-phase transformer is connected with the input side ports of corresponding electrical energy transformer, and the outlet side port of each electrical energy transformer is connect with preset contact net and preset rail respectively.Based on above structure, it is ensured that when in part, electrical energy changer breaks down, traction substation, which can also rely on other electrical energy changers, to be continued to provide the continuous supply voltage of voltage magnitude and phase invariant to contact net.Power supply system in the present invention includes above-mentioned traction substation.
Description
Technical field
The present invention relates to power control technology fields, and in particular to a kind of through homo-phase traction power supply system, traction become
Electric institute and its method for controlling power supply.
Background technique
Electric railway traction power supply system refers to the power supply system for supplying electric power locomotive traction electricity consumption, is mainly become by traction
Electric institute and contact net composition.Power plant is transformed by traction substation through the three-phase alternating current that high voltage transmission line is sent is suitable for electricity
It after the electric current and voltage of power locomotive, send to contact net, then from contact net to locomotive power supply.
In order to meet the needs of railway system's single phase power supply, electric railway traction power supply system is usually in different power supplies
It is segmented in such a way that split-phase is powered to electric locomotive power supply (the i.e. different a certain phase progress being segmented using in three phase network of powering
Power supply).But there are insulation layers between the split-phase of split-phase power supply, when electric locomotive passes through insulation layer, electric railway traction is supplied
Electric system will be unable to electric locomotive normal power supply.In the process, it will electric locomotive traction power and speed is caused to generate damage
Negative-sequence current is lost and causes to occur in three phase network, and negative-sequence current can be more serious with the increase of Electric Locomotive.
Currently, mainly being guaranteed using cophase supply system (such as through cophase supply system) to electric locomotive power supply
The amplitude and phase of supply voltage keep continuous and do not mutate (to utilize cophase supply system in electric locomotive operational process
Without carrying out split-phase power supply when power supply).
Refering to attached drawing 5, Fig. 5 illustrates a kind of master of traction substation suitable for through cophase supply system
Want structure.As shown in figure 5, the traction substation includes industrial frequency traction transformer and the single-phase AC/AC current transformer of three-phase-.Wherein, work
Frequency tractive transformer is three-phase windings transformer, the high-pressure side winding of the three-phase windings transformer respectively with three phase lines of power grid
Connection, low-pressure side winding are connect with three ac input end mouths of the single-phase AC/AC current transformer of three-phase-respectively.Based on above-mentioned traction
Although the through cophase supply system of electric substation can guarantee that the supply voltage between different traction substations is identical, work as
It is will be unable to when current transformer breaks down to electric locomotive normal power supply, thus power supply reliability is poor.
Summary of the invention
In order to solve the above problem in the prior art, in order to solve how to ask to the technology of electric locomotive reliable power supply
Topic, the present invention provides a kind of through homo-phase traction power supply system, traction substation and its method for controlling power supply.
In a first aspect, the traction substation in the present invention includes multiple electrical energy changers, the electrical energy changer
Including single-phase transformer and electrical energy transformer；
The high-voltage winding of each single-phase transformer is connected from the phase line that two different in power grid respectively, each list
The low pressure winding of phase transformer is connected with the input side ports of corresponding electrical energy transformer；
The outlet side port of each electrical energy transformer is connect with contact net and rail respectively.
Further, an optimal technical scheme provided by the invention is:
The electrical energy transformer is ac-to-ac converter.
Further, an optimal technical scheme provided by the invention is:
The voltage change ratio of each single-phase transformer is all the same；
The capacity of each electrical energy transformer is all the same.
Further, an optimal technical scheme provided by the invention is:
The quantity of the electrical energy changer is 2 or 3.
The method for controlling power supply of traction substation in second aspect, the present invention includes the following steps:
According to preset load power demand, to the electrical energy transformer of each electrical energy changer in the traction substation
Input current closed-loop control is carried out,
Output voltage closed-loop control carried out the electrical energy transformer of some electrical energy changer, and with it is described some
The output electric current of the electrical energy transformer of electrical energy changer is that target value carries out the electrical energy transformer of other electrical energy changers
Export current closed-loop tracing control.
Further, an optimal technical scheme provided by the invention is:
When in the traction substation there are one or three operate normally electrical energy changer when, " to the traction
In electric substation each electrical energy changer electrical energy transformer carry out input current closed-loop control " the step of include:
According to the active power output valve of electrical energy transformer in the electrical energy changer of the normal operation and described normal
The corresponding grid line voltage of the electrical energy changer of operation obtains watt current given value；
Using the watt current given value as input current given value, input current closed loop is carried out to the electrical energy transformer
Control.
Further, an optimal technical scheme provided by the invention is:
When in the traction substation there are two operate normally electrical energy changer when, " to the traction substation
In each electrical energy changer electrical energy transformer carry out input current closed-loop control " the step of include:
According to the active power output valve of electrical energy transformer in the electrical energy changer of the normal operation and described normal
The corresponding grid line voltage of the electrical energy changer of operation obtains watt current given value；
According to preset watt current and reactive current corresponding relationship, it is corresponding idle to obtain the watt current given value
Given value of current value；
According to the watt current given value and reactive current given value, input current given value is calculated to the electric energy
Converter carries out input current closed-loop control.
Further, an optimal technical scheme provided by the invention is:
The phase of the watt current given value is identical as the phase of corresponding grid line voltage, and the watt current is given
The amplitude of value are as follows:
IMref_p=2 × PM/UM
Wherein, the IMref_pIt is the amplitude of the corresponding watt current given value of m-th electrical energy changer, the PMIt is
The active power output valve of the corresponding electrical energy transformer of m-th electrical energy changer, the UMIt is m-th electrical energy changer pair
The amplitude for the grid line voltage answered.
Further, an optimal technical scheme provided by the invention is:
90 ° of phase phase difference with corresponding grid line voltage of the phase of the reactive current given value, the reactive current
The amplitude of given value are as follows:
IMref_q=IMref_p×tan(30°)
Wherein, the IMref_qIt is the amplitude of the corresponding reactive current given value of m-th electrical energy changer, the IMref_p
It is the amplitude of the corresponding watt current given value of m-th electrical energy changer.
Further, an optimal technical scheme provided by the invention is:
The input current given value are as follows:
iMref=iMref_p+iMref_q
Wherein, the iMref、iMref_pAnd iMref_qIt is that the corresponding input current of m-th electrical energy changer is given respectively
Value, watt current given value and reactive current given value.
Through homo-phase traction power supply system in the third aspect, the present invention includes described in multiple above-mentioned technical proposals
Traction substation.
Compared with the immediate prior art, above-mentioned technical proposal is at least had the following beneficial effects:
1, the traction substation in the present invention includes multiple electrical energy changers and each electrical energy changer includes list
Phase transformer and electrical energy transformer.Specifically, the high-voltage winding of each single-phase transformer respectively from two different phases in power grid
Line connection, the low pressure winding of each single-phase transformer are connected with the input side ports of corresponding electrical energy transformer.Each electric energy becomes
The outlet side port of parallel operation is connect with contact net and rail respectively.Based on above structure, it is ensured that filled in part transformation of electrical energy
It sets when breaking down, traction substation, which can also rely on other electrical energy changers, to be continued to provide voltage magnitude and phase to contact net
The continuous supply voltage of invariant position, power supply reliability are high.
2, the no-load voltage ratio of each single-phase transformer of traction substation is identical in the present invention, by controlling each transformation of electrical energy
Device output power is identical, it is ensured that each electrical energy transformer capacity is identical.
3, the method for controlling power supply of the traction substation in the present invention mainly includes the following steps: to every in traction substation
The electrical energy transformer of a electrical energy changer carries out input current closed-loop control, to the electrical energy transformer of some electrical energy changer
Output voltage closed-loop control is carried out, and is target value to it using the output electric current of the electrical energy transformer of some electrical energy changer
The electrical energy transformer of his electrical energy changer carries out output current closed-loop tracing control.When normal there are two in traction substation
Carrying out the corresponding input current given value of input current closed-loop control to electrical energy transformer when the electrical energy changer of operation includes
Reactive current given value, to can effectively eliminate power grid in the identical situation of each electrical energy changer output power
In negative-sequence current.
Detailed description of the invention
Fig. 1 is a kind of primary structure schematic diagram of through homo-phase traction power supply system in the embodiment of the present invention；
Fig. 2 is a kind of primary structure schematic diagram of traction substation in the embodiment of the present invention；
Fig. 3 is the primary structure schematic diagram that traction substation contains two electrical energy changers in the embodiment of the present invention；
Fig. 4 is the primary structure schematic diagram that traction substation contains three electrical energy changers in the embodiment of the present invention.
Fig. 5 is a kind of primary structure of conventional traction substation.
Specific embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining technical principle of the invention, it is not intended that limit the scope of the invention.
With reference to the accompanying drawing, a kind of through homo-phase traction power supply system provided by the invention is illustrated.
Refering to attached drawing 1, Fig. 1 illustrates a kind of main knot of through homo-phase traction power supply system in the present embodiment
Structure.As shown in Figure 1, through homo-phase traction power supply system may include (the traction power transformation of multiple traction substations in the present embodiment
1~traction substation n), and these traction substations be arranged in parallel in preset power grid and preset contact net/rail it
Between, the three-phase electric energy of power grid can be converted to single-phase electric energy to contact net/rail power supply by traction substation.
With continued reference to attached drawing 2, Fig. 2 illustrate one kind in the present embodiment can be adapted for it is through same shown in Fig. 1
The primary structure of the traction substation of phase tractive power supply system.As shown in Fig. 2, the traction substation in the present embodiment mainly includes
Multiple electrical energy changers (electrical energy changer 1~electrical energy changer N, wherein N=2 or 3), and each transformation of electrical energy fills
Set all includes single-phase transformer and electrical energy transformer.
Specifically, the high-voltage winding of each single-phase transformer connects from the phase line that two different in power grid respectively in the present embodiment
Connect (high-voltage winding of i.e. each single-phase transformer is respectively connected to a grid line voltage), the low pressure winding of each single-phase transformer
Connected with the input side ports of corresponding electrical energy transformer, the outlet side port of each electrical energy transformer respectively with contact net and steel
Rail connection.Optionally, the voltage change ratio of each single-phase transformer of traction substation is all the same in the present embodiment, and each electric energy becomes
The output power of parallel operation is identical, thereby may be ensured that the capacity of each electrical energy transformer is identical.
In the present embodiment, the electric energy that single-phase transformer exports can be converted to load (such as electric power machine by electrical energy transformer
Vehicle) electric energy that can be used.For example, it can export single-phase transformer when electrical energy transformer is ac-to-ac converter
Electric energy be converted to the alternating current of specific voltage grade, when electrical energy transformer is A.C.-D.C. converter, it can will be single-phase
The electric energy of transformer output is converted to the direct current of specific voltage grade.
In a preferred embodiment of the present embodiment, traction substation shown in Fig. 2 may include that two electric energy become
Changing device.The traction substation in the present embodiment is illustrated with reference to the accompanying drawing.
Refering to attached drawing 3, Fig. 3 illustrates the primary structure of traction substation in the present embodiment.As shown in figure 3,
An electrical energy changer in the present embodiment in traction substation may include single-phase transformer Ta and electrical energy transformer
CPSC1 (succinct in order to describe, which is described as electrical energy changer A), another electrical energy changer can
To include single-phase transformer Tb and electrical energy transformer CPSC2 (in order to describe that succinctly the electrical energy changer is described as electric energy and is become
Changing device B).
Specifically, one end of the high-voltage winding of single-phase transformer Ta (shown in Fig. 3 in electrical energy changer A in the present embodiment
T1End) connect with the first phase line (A phase ac bus shown in Fig. 3) of power grid, the high-voltage winding of single-phase transformer Ta it is another
One end (T shown in Fig. 32End) it is connect with the second phase line (B phase ac bus shown in Fig. 3) of power grid, single-phase transformer Ta's
Low pressure winding is connect with the input side of electrical energy transformer CPSC1.
First electrode end (the X shown in Fig. 3 of the input side of electrical energy transformer CPSC1 in electrical energy changer A1End) and it is single
One end (T shown in Fig. 3 of the low pressure winding of phase transformer Ta3End) connection, the second electricity of the input side of electrical energy transformer CPSC1
Extremely (X shown in Fig. 32End) other end (T shown in Fig. 3 with the low pressure winding of single-phase transformer Ta4End) connection.Electric energy becomes
First electrode end (the X shown in Fig. 3 of the outlet side of parallel operation CPSC13End) it is connect with contact net, electrical energy transformer CPSC1's is defeated
Second electrode end (the X shown in Fig. 3 of side out4End) it is connect with rail.
One end (T shown in Fig. 3 of the high-voltage winding of single-phase transformer Tb in electrical energy changer B5End) with power grid the
Two phase lines (B phase ac bus shown in Fig. 3) connection, the other end (T shown in Fig. 3 of the high-voltage winding of single-phase transformer Tb6
End) it is connect with the third phase line (C phase ac bus shown in Fig. 3) of power grid, the low pressure winding and electric energy of single-phase transformer Tb becomes
The input side of parallel operation CPSC2 connects.
First electrode end (the X shown in Fig. 3 of the input side of electrical energy transformer CPSC2 in electrical energy changer B5End) and it is single
One end (T shown in Fig. 3 of the low pressure winding of phase transformer Tb7End) connection, the second electricity of the input side of electrical energy transformer CPSC2
Extremely (X shown in Fig. 36End) other end (T shown in Fig. 3 with the low pressure winding of single-phase transformer Tb8End) connection.Electric energy becomes
First electrode end (the X shown in Fig. 3 of the outlet side of parallel operation CPSC27End) it is connect with contact net, electrical energy transformer CPSC2's is defeated
Second electrode end (the X shown in Fig. 3 of side out8End) it is connect with rail.
In another preferred embodiment of the present embodiment, traction substation shown in Fig. 3 can also include three electricity
It can converting means.The traction substation in the present embodiment is illustrated with reference to the accompanying drawing.
Refering to attached drawing 4, Fig. 4 illustrates the primary structure of traction substation in the present embodiment.As shown in figure 4,
First electrical energy changer in the present embodiment in traction substation may include single-phase transformer Ta and electrical energy transformer
CPSC1 (succinct in order to describe, which is described as electrical energy changer A), second electrical energy changer can
To include single-phase transformer Tb and electrical energy transformer CPSC2 (in order to describe that succinctly the electrical energy changer is described as electric energy and is become
Changing device B), third electrical energy changer may include single-phase transformer Tc and electrical energy transformer CPSC3 (in order to describe letter
It is clean, which is described as electrical energy changer C)
Specifically, in the present embodiment electrical energy changer A and electrical energy changer B respectively with transformation of electrical energy shown in Fig. 3
Device A is identical with electrical energy changer B, and succinct in order to describe, details are not described herein.
In the present embodiment, in electrical energy changer C the high-voltage winding of single-phase transformer Tc one end (T shown in Fig. 49
End) it is connect, the other end of the high-voltage winding of single-phase transformer Tc with the third phase line (C phase ac bus shown in Fig. 4) of power grid
(T shown in Fig. 410End) it is connect, the low pressure of single-phase transformer Tc with the first phase line (A phase ac bus shown in Fig. 4) of power grid
Winding is connect with the input side of electrical energy transformer CPSC3.
First electrode end (the X shown in Fig. 4 of the input side of electrical energy transformer CPSC3 in electrical energy changer C9End) and it is single
One end (T shown in Fig. 4 of the low pressure winding of phase transformer Tc11End) connection, the second electricity of the input side of electrical energy transformer CPSC3
Extremely (X shown in Fig. 410End) other end (T shown in Fig. 4 with the low pressure winding of single-phase transformer Tc12End) connection.Electric energy
First electrode end (the X shown in Fig. 4 of the outlet side of converter CPSC311End) it is connect with contact net, electrical energy transformer CPSC3's
Second electrode end (the X shown in Fig. 4 of outlet side12End) it is connect with rail.
Further, it is based on above-mentioned traction substation embodiment, the present invention also provides one kind to be directed to above-mentioned traction power transformation
The method for controlling power supply of traction substation described in institute's embodiment.Below by taking traction substation shown in Fig. 4 as an example, to the present invention
The method for controlling power supply of the traction substation of offer is illustrated.It specifically, can be in accordance with the following steps to leading in the present embodiment
Draw electric substation and be powered control:
Step S101: according to preset load power demand, to the electric energy of electrical energy changer each in traction substation
Converter carries out input current closed-loop control.
In the present embodiment, when the electrical energy changer operated normally in traction substation there are one or three (is such as led
Draw electric substation including three electrical energy changers and three electrical energy changers operate normally or traction substation includes three
A electrical energy changer and two electrical energy changers break down or traction substation include two electrical energy changers and
One electrical energy changer breaks down) when, input current given value can be obtained in accordance with the following steps, thus to transformation of electrical energy
Device carries out input current closed-loop control:
According to the active power output valve of electrical energy transformer in electrical energy changer and the corresponding power grid of electrical energy changer
Line voltage obtains watt current given value, and using watt current given value as input current given value, to electrical energy transformer into
Row input current closed-loop control.The phase phase of the phase of watt current given value and corresponding grid line voltage in the present embodiment
Together, the amplitude I of watt current given valueMref_pAs shown in following formula (1):
IMref_p=2 × PM/UM (1)
Each meaning of parameters in formula (1) are as follows:
PMIt is the active power output valve of the corresponding electrical energy transformer of m-th electrical energy changer, UMIt is that m-th electric energy becomes
The amplitude of the corresponding grid line voltage of changing device.
Below for the electrical energy changer A of the traction substation shown in Fig. 4, to the specific of above-mentioned acquisition given value of current value
Operating process is illustrated.
For electrical energy changer A, input current given value i can be obtained in accordance with the following stepsAref: according to being input to
The grid line voltage U of single-phase transformer TaABWith the active-power P of electrical energy transformer CPSC11, obtain watt current given value
iAref_p.Specifically, watt current given value iAref_pPhase and grid line voltage UABPhase it is identical, watt current given value
iAref_pCurrent amplitude IAref_pAs shown in following formula (2):
IAref_p=2 × P1/UAB (2)
Further, in the present embodiment when in traction substation there are two operate normally electrical energy changer (such as
Traction substation includes two electrical energy changers and two electrical energy changers operate normally or traction substation includes
Three electrical energy changers and an electrical energy changer breaks down) when, can obtain in accordance with the following steps input current to
Definite value, to carry out input current closed-loop control to electrical energy transformer:
Firstly, obtaining watt current given value according to method shown in formula (1).
Then, according to preset watt current and reactive current corresponding relationship, the corresponding nothing of watt current given value is obtained
Function given value of current value.90 ° of phase phase difference with corresponding grid line voltage of the phase of reactive current given value, nothing in the present embodiment
The amplitude I of function given value of current valueMref_qAs shown in following formula (3):
IMref_q=IMref_p×tan(30°) (3)
Finally, calculating according to watt current given value and reactive current given value and carrying out input current to electrical energy transformer
The corresponding input current given value of closed-loop control.Input current given value i in the present embodimentMrefAs shown in following formula (4):
iMref=iMref_p+iMref_q (4)
Each meaning of parameters in formula (4) are as follows:
iMref_pIt is the corresponding watt current given value of m-th electrical energy changer, iMref_qIt is m-th electrical energy changer
Corresponding reactive current given value.
Below (assuming that the corresponding electrical energy transformer CPSC3 of electrical energy changer C by taking traction substation shown in Fig. 4 as an example
Break down), the specific operation process of above-mentioned acquisition given value of current value is illustrated.
For electrical energy changer A, input current given value i can be obtained in accordance with the following stepsAref: firstly, according to
Method shown in formula (1) obtains watt current given value iAref_pAmplitude IAref_p.Then, according to side shown in formula (3)
Method obtains reactive current given value iAref_qAmplitude IAref_q.Finally, input electricity is calculated according to method shown in formula (4)
Flow given value iAref.Wherein, watt current given value iAref_pPhase and grid line voltage UABPhase it is identical, reactive current
Given value iAref_qPhase than grid line voltage UABAdvanced 90 ° of phase.
For electrical energy changer B, input current given value i can be obtained in accordance with the following stepsBref: firstly, according to
Method shown in formula (1) obtains watt current given value iBref_pAmplitude IBref_p.Then, according to side shown in formula (3)
Method obtains reactive current given value iBref_qAmplitude IBref_q.Finally, input electricity is calculated according to method shown in formula (4)
Flow given value iBref.Wherein, watt current given value iBref_pPhase and grid line voltage UBCPhase it is identical, reactive current
Given value iBref_qPhase than grid line voltage UBC90 ° of delayed phase.
In the present embodiment, after electrical energy transformer CPSC3 breaks down, electrical energy transformer CPSC1 and electrical energy transformer
CPSC2 can still be operated normally, allow traction substation using drop volume output by the way of the (output power of traction substation
It is down to the 2/3 of former output power) continue the supply voltage that output voltage amplitude is remained unchanged with phase to contact net.Meanwhile electricity
It can include reactive current in the input current given value of converter CPSC1 and electrical energy transformer CPSC2, so as to eliminate net side
Negative-sequence current.
Step S102: output voltage closed-loop control is carried out to the electrical energy transformer of some electrical energy changer, and with certain
The output electric current of the electrical energy transformer of a electrical energy changer be target value to the electrical energy transformers of other electrical energy changers into
Row output current closed-loop tracing control.
Below by taking traction substation shown in Fig. 4 as an example (assuming that electrical energy changer A~C is operated normally), to above-mentioned
Voltage/current control process is illustrated.
For example, the electrical energy transformer CPSC1 to electrical energy changer A carries out output voltage closed-loop control, and become with electric energy
The output electric current of parallel operation CPSC1 is electrical energy transformer CPSC2 and electrical energy changer C of the target value to electrical energy changer B
Electrical energy transformer CPSC3 carries out output current closed-loop tracing control.
In another example the electrical energy transformer CPSC2 to electrical energy changer B carries out output voltage closed-loop control, and with electric energy
The output electric current of converter CPSC2 is electrical energy transformer CPSC1 and electrical energy changer C of the target value to electrical energy changer A
Electrical energy transformer CPSC3 carry out output current closed-loop tracing control.
For another example the electrical energy transformer CPSC3 to electrical energy changer C carries out output voltage closed-loop control, and with electric energy
The output electric current of converter CPSC3 is electrical energy transformer CPSC1 and electrical energy changer B of the target value to electrical energy changer A
Electrical energy transformer CPSC2 carry out output current closed-loop tracing control.
It, may in a certain phase winding of transformer high-voltage winding when different transformers accesses the same grid line voltage
The no electric current of meeting (i.e. the high voltage side current of transformer is asymmetric, will lead to power grid and generates negative-sequence current), can not also pass through at this time
The input current of different converter is adjusted to compensate to the negative-sequence current in power grid.In the present embodiment, when traction power transformation
The single-phase transformer difference of each electrical energy changer when including three electrical energy changers (traction substation shown in Fig. 4)
Different grid line voltages is accessed, electric current asymmetry problem will not be generated, that is to say, that not will lead to power grid and generate negative phase-sequence electricity
Stream.When traction substation include two access not electrical energy changer (traction substations shown in Fig. 3) of line voltage when
Guarantee in the identical situation of each electrical energy changer output power, nothing is carried out to the electrical energy transformer of each electrical energy changer
Function current compensation need to only guarantee to supplement each electrical energy transformer the identical reactive current of amplitude (i.e. in input current closed loop control
Reactive current given value is introduced in system) negative-sequence current compensation can be carried out to power grid.
It will be understood by those skilled in the art that the device of system in embodiment can be adaptively changed and
They are arranged in one or more systems unlike this embodiment.Device in embodiment can be combined into a dress
It sets, and furthermore they can be divided into multiple sub-devices.In addition at least some of such feature and/or process are mutual
It, can be using any combination to institute disclosed in this specification (including adjoint claim, abstract and attached drawing) except repulsion
There are feature and so disclosed any system or all processes of device to be combined.Unless expressly stated otherwise, this theory
Each feature disclosed in bright book (including the accompanying claims, abstract and drawings) can be identical, equivalent, or similar by providing
The alternative features of purpose replace.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.Word "comprising" and
" comprising " does not exclude the presence of element or step not listed in the claims.Word "a" or "an" located in front of the element is not
There are multiple such elements for exclusion.The present invention can be by means of including the hardware of several different elements and by means of appropriate
The PC of programming is realized.The use of word first, second, and third does not indicate any sequence.These words can be explained
For title.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in claims of the present invention, embodiment claimed
It is one of any can in any combination mode come using.
So far, it has been combined preferred embodiment shown in the drawings and describes technical solution of the present invention, still, this field
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these specific embodiments.Without departing from this
Under the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to the relevant technologies feature, these
Technical solution after change or replacement will fall within the scope of protection of the present invention.
Claims (11)
1. a kind of traction substation, it is characterised in that including multiple electrical energy changers, the electrical energy changer includes single-phase
Transformer and electrical energy transformer；
The high-voltage winding of each single-phase transformer is connected from the phase line that two different in power grid respectively, each single-phase change
The low pressure winding of depressor is connected with the input side ports of corresponding electrical energy transformer；
The outlet side port of each electrical energy transformer is connect with contact net and rail respectively.
2. traction substation according to claim 1, which is characterized in that the electrical energy transformer is AC-AC converter
Device.
3. traction substation according to claim 2, which is characterized in that
The voltage change ratio of each single-phase transformer is all the same；
The capacity of each electrical energy transformer is all the same.
4. traction substation according to any one of claim 1-3, which is characterized in that the number of the electrical energy changer
Amount is 2 or 3.
5. a kind of method for controlling power supply of traction substation of any of claims 1-4, which is characterized in that the confession
Electric control method includes:
According to preset load power demand, the electrical energy transformer of each electrical energy changer in the traction substation is carried out
Input current closed-loop control,
Output voltage closed-loop control is carried out the electrical energy transformer of some electrical energy changer, and with some described electric energy
The output electric current of the electrical energy transformer of converting means is that target value exports the electrical energy transformer of other electrical energy changers
Current closed-loop tracing control.
6. the method for controlling power supply of traction substation according to claim 5, which is characterized in that when the traction substation
It is middle there are one or three operate normally electrical energy changer when, " to each electrical energy changer in the traction substation
Electrical energy transformer carry out input current closed-loop control " the step of include:
According to the active power output valve and the normal operation of electrical energy transformer in the electrical energy changer of the normal operation
The corresponding grid line voltage of electrical energy changer, obtain watt current given value；
Using the watt current given value as input current given value, the control of input current closed loop is carried out to the electrical energy transformer
System.
7. the method for controlling power supply of traction substation according to claim 5, which is characterized in that when the traction substation
It is middle there are two operate normally electrical energy changer when, " to the electric energy of each electrical energy changer in the traction substation
Converter carry out input current closed-loop control " the step of include:
According to the active power output valve and the normal operation of electrical energy transformer in the electrical energy changer of the normal operation
The corresponding grid line voltage of electrical energy changer, obtain watt current given value；
According to preset watt current and reactive current corresponding relationship, the corresponding reactive current of the watt current given value is obtained
Given value；
According to the watt current given value and reactive current given value, input current given value is calculated to the transformation of electrical energy
Device carries out input current closed-loop control.
8. the method for controlling power supply of traction substation according to claim 5 or 6, which is characterized in that the watt current
The phase of given value is identical as the phase of corresponding grid line voltage, the amplitude of the watt current given value are as follows:
IMref_p=2 × PM/UM
Wherein, the IMref_pIt is the amplitude of the corresponding watt current given value of m-th electrical energy changer, the PMIt is M electricity
The active power output valve of the corresponding electrical energy transformer of energy converting means, the UMIt is the corresponding electricity of m-th electrical energy changer
The amplitude of cable voltage.
9. the method for controlling power supply of traction substation according to claim 7, which is characterized in that the reactive current is given
90 ° of phase phase difference with corresponding grid line voltage of the phase of value, the amplitude of the reactive current given value are as follows:
IMref_q=IMref_p×tan(30°)
Wherein, the IMref_qIt is the amplitude of the corresponding reactive current given value of m-th electrical energy changer, the IMref_pIt is
The amplitude of the corresponding watt current given value of M electrical energy changer.
10. the method for controlling power supply of traction substation according to claim 7, which is characterized in that the input current is given
Definite value are as follows:
iMref=iMref_p+iMref_q
Wherein, the iMref、iMref_pAnd iMref_qIt is the corresponding input current given value of m-th electrical energy changer respectively, active
Given value of current value and reactive current given value.
11. a kind of through homo-phase traction power supply system, it is characterised in that including multiple of any of claims 1-4
Traction substation.
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