CN109050352B - Through type in-phase traction power supply system, traction substation and power supply control method thereof - Google Patents
Through type in-phase traction power supply system, traction substation and power supply control method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of power control, and particularly provides a through-type in-phase traction power supply system, a traction substation and a power supply control method thereof, aiming at solving the technical problem of how to reliably supply power to an electric locomotive. To this end, the present invention provides a traction substation comprising a plurality of power conversion devices. Specifically, the electric energy conversion device comprises single-phase transformers and electric energy converters, wherein a high-voltage winding of each single-phase transformer is connected with two different phase lines in a preset power grid respectively, a low-voltage winding of each single-phase transformer is connected with an input side port of the corresponding electric energy converter, and an output side port of each electric energy converter is connected with a preset contact net and a preset steel rail respectively. Based on above-mentioned structure, can guarantee when some electric energy conversion device break down, draw the electric substation and can also rely on other electric energy conversion device to continue to provide the constant supply voltage of voltage amplitude and unchangeable with the phase place to the contact net. The power supply system of the invention comprises the traction substation.
Description
Technical Field
The invention relates to the technical field of power control, in particular to a through-type in-phase traction power supply system, a traction substation and a power supply control method thereof.
Background
The traction power supply system of the electrified railway is a power supply system for supplying power for traction of an electric locomotive and mainly comprises a traction substation and a contact network. The traction substation converts three-phase alternating current sent by a power plant through a high-voltage transmission line into current and voltage suitable for an electric locomotive, then sends the current and the voltage to a contact network, and then the contact network supplies power to the locomotive.
In order to meet the requirement of single-phase power supply of a railway system, the traction power supply system of the electrified railway generally supplies power to an electric locomotive in a split-phase power supply mode in different power supply sections (that is, different power supply sections supply power by using a certain phase in a three-phase power grid). However, insulation areas exist among the phases of the split-phase power supply, and the traction power supply system of the electrified railway cannot normally supply power to the electric locomotive when the electric locomotive passes through the insulation areas. In the process, the traction and speed of the electric locomotive are lost, and a negative sequence current appears in the three-phase power grid, and the negative sequence current is more serious along with the increase of the power of the electric locomotive.
At present, an in-phase power supply system (such as a through in-phase power supply system) is mainly adopted to supply power to an electric locomotive to ensure that the amplitude and the phase of a power supply voltage are kept continuous and do not generate sudden change in the operation process of the electric locomotive (namely, split-phase power supply is not needed when the in-phase power supply system is used for supplying power).
Referring to fig. 5, fig. 5 illustrates the main structure of a traction substation suitable for a pass-through in-phase power supply system. As shown in fig. 5, the traction substation includes a line frequency traction transformer and a three-phase to single-phase AC/AC converter. The power frequency traction transformer is a three-phase winding transformer, a high-voltage side winding of the three-phase winding transformer is respectively connected with three phase lines of a power grid, and a low-voltage side winding of the three-phase winding transformer is respectively connected with three alternating current input ports of a three-phase-single-phase AC/AC converter. Although the through-type in-phase power supply system based on the traction substation can ensure that the power supply voltages of different traction substations are the same, the power supply system cannot normally supply power to the electric locomotive when the converter fails, so that the power supply reliability is poor.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem of how to reliably supply power to an electric locomotive, the invention provides a through-type in-phase traction power supply system, a traction substation and a power supply control method thereof.
In a first aspect, the traction substation of the present invention comprises a plurality of power conversion devices including a single-phase transformer and a power converter;
the high-voltage winding of each single-phase transformer is respectively connected with two different phase lines in a power grid, and the low-voltage winding of each single-phase transformer is connected with the input side port of the corresponding electric energy converter;
and an output side port of each electric energy converter is respectively connected with a contact net and a steel rail.
Further, a preferred technical solution provided by the present invention is:
the power converter is an ac-ac converter.
Further, a preferred technical solution provided by the present invention is:
the voltage ratio of each single-phase transformer is the same;
the capacity of each of the power converters is the same.
Further, a preferred technical solution provided by the present invention is:
the number of the electric energy conversion devices is 2 or 3.
In a second aspect, a power supply control method for a traction substation according to the present invention includes the steps of:
performing input current closed-loop control on the electric energy converter of each electric energy conversion device in the traction substation according to a preset load power requirement,
and performing output voltage closed-loop control on the electric energy converter of a certain electric energy conversion device, and performing output current closed-loop tracking control on the electric energy converters of other electric energy conversion devices by taking the output current of the electric energy converter of the certain electric energy conversion device as a target value.
Further, a preferred technical solution provided by the present invention is:
when one or three normally-operating electric energy conversion devices exist in the traction substation, the step of performing input current closed-loop control on the electric energy converter of each electric energy conversion device in the traction substation comprises the following steps:
obtaining an active current given value according to an active power output value of an electric energy converter in the normally-operated electric energy conversion device and a power grid line voltage corresponding to the normally-operated electric energy conversion device;
and performing input current closed-loop control on the electric energy converter by taking the active current given value as an input current given value.
Further, a preferred technical solution provided by the present invention is:
when two normally-operated electric energy conversion devices exist in the traction substation, the step of performing input current closed-loop control on the electric energy converter of each electric energy conversion device in the traction substation comprises the following steps:
obtaining an active current given value according to an active power output value of an electric energy converter in the normally-operated electric energy conversion device and a power grid line voltage corresponding to the normally-operated electric energy conversion device;
obtaining a reactive current given value corresponding to the active current given value according to a preset corresponding relation between the active current and the reactive current;
and calculating an input current given value according to the active current given value and the reactive current given value so as to perform input current closed-loop control on the electric energy converter.
Further, a preferred technical solution provided by the present invention is:
the phase position of the active current given value is the same as the phase position of the corresponding power grid line voltage, and the amplitude value of the active current given value is as follows:
IMref_p＝2×PM/UM
wherein, the IMref_pIs the amplitude of the active current set value corresponding to the Mth electric energy conversion device, wherein P is the amplitude of the active current set value corresponding to the Mth electric energy conversion deviceMIs the active power output value of the power converter corresponding to the Mth power converter, UMIs the amplitude of the grid line voltage corresponding to the mth power conversion device.
Further, a preferred technical solution provided by the present invention is:
the phase difference between the given reactive current value and the corresponding network line voltage is 90 degrees, and the amplitude of the given reactive current value is as follows:
IMref_q＝IMref_p×tan(30°)
wherein, the IMref_qIs the amplitude of the given reactive current value corresponding to the Mth electric energy conversion device, IMref_pIs the amplitude of the active current set value corresponding to the Mth electric energy conversion device.
Further, a preferred technical solution provided by the present invention is:
the given value of the input current is as follows:
iMref＝iMref_p+iMref_q
wherein, the iMref、iMref_pAnd iMref_qThe input current given value, the active current given value and the reactive current given value which correspond to the Mth electric energy conversion device are respectively set.
In a third aspect, the through-type in-phase traction power supply system according to the present invention includes a plurality of traction substations described in the above aspects.
Compared with the closest prior art, the technical scheme at least has the following beneficial effects:
1. the traction substation comprises a plurality of electric energy conversion devices, and each electric energy conversion device comprises a single-phase transformer and an electric energy converter. Specifically, the high-voltage winding of each single-phase transformer is respectively connected with two different phase lines in the power grid, and the low-voltage winding of each single-phase transformer is connected with the input side port of the corresponding power converter. And an output side port of each electric energy converter is respectively connected with a contact net and a steel rail. Based on above-mentioned structure, can guarantee when some electric energy conversion device break down, draw the electric substation and can also rely on other electric energy conversion device to continue to provide the constant supply voltage of voltage amplitude and unchangeable with the phase place to the contact net, the power supply reliability is high.
2. The transformation ratio of each single-phase transformer of the traction substation is the same, and the capacity of each electric energy converter can be ensured to be the same by controlling each electric energy conversion device to have the same output power.
3. The power supply control method of the traction substation mainly comprises the following steps: the method comprises the steps of carrying out input current closed-loop control on an electric energy converter of each electric energy conversion device in the traction substation, carrying out output voltage closed-loop control on an electric energy converter of a certain electric energy conversion device, and carrying out output current closed-loop tracking control on electric energy converters of other electric energy conversion devices by taking the output current of the electric energy converter of the certain electric energy conversion device as a target value. When two normally-operated electric energy conversion devices exist in the traction substation, the input current given value corresponding to the input current closed-loop control of the electric energy converter contains a reactive current given value, so that the negative sequence current in the power grid can be effectively eliminated under the condition that the output power of each electric energy conversion device is the same.
Drawings
FIG. 1 is a schematic diagram of a main structure of a through-type in-phase traction power supply system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main structure of a traction substation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the main structure of a traction substation including two power conversion devices according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a main structure of three electric energy conversion devices included in the traction substation according to the embodiment of the present invention.
Fig. 5 is a main structure of a conventional traction substation.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The following describes a through-type in-phase traction power supply system provided by the invention with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 illustrates a main structure of a through-type in-phase traction power supply system in the present embodiment. As shown in fig. 1, the through-type in-phase traction power supply system in this embodiment may include a plurality of traction substations (traction substation 1 to traction substation n), and the traction substations are arranged in parallel between a preset power grid and a preset overhead line system/rail, and the traction substations may convert three-phase power of the power grid into single-phase power to supply power to the overhead line system/rail.
With continued reference to fig. 2, fig. 2 illustrates a main structure of a traction substation applicable to the through-type in-phase traction power supply system shown in fig. 1 according to the present embodiment. As shown in fig. 2, the traction substation of the present embodiment mainly includes a plurality of power conversion devices (power conversion device 1 to power conversion device N, where N is 2 or 3), and each power conversion device includes a single-phase transformer and a power converter.
Specifically, in this embodiment, the high-voltage winding of each single-phase transformer is connected to two different phase lines in the power grid (that is, the high-voltage winding of each single-phase transformer is connected to a power grid line voltage), the low-voltage winding of each single-phase transformer is connected to an input-side port of the corresponding power converter, and an output-side port of each power converter is connected to a contact network and a steel rail. Optionally, in this embodiment, the voltage ratios of each single-phase transformer of the traction substation are the same, and the output power of each power converter is the same, so that the capacity of each power converter can be ensured to be the same.
In this embodiment, the power converter may convert the power output from the single-phase transformer into power that can be used by a load (e.g., an electric locomotive). For example, when the power converter is an ac-ac converter, it may convert the electric energy output from the single-phase transformer into ac power of a specific voltage class, and when the power converter is an ac-dc converter, it may convert the electric energy output from the single-phase transformer into dc power of a specific voltage class.
In a preferred embodiment of this example, the traction substation shown in fig. 2 may include two power conversion devices. The traction substation according to the present embodiment will be described below with reference to the drawings.
Referring to fig. 3, fig. 3 schematically shows the main structure of the traction substation in the present embodiment. As shown in fig. 3, one power conversion device in the traction substation in the present embodiment may include a single-phase transformer Ta and a power converter CPSC1 (the power conversion device is described as power conversion device a for simplicity of description), and the other power conversion device may include a single-phase transformer Tb and a power converter CPSC2 (the power conversion device is described as power conversion device B for simplicity of description).
Specifically, in the present embodiment, one end (T shown in fig. 3) of the high-voltage winding of the single-phase transformer Ta in the electric energy conversion device a1End) is connected to the first phase line of the grid (a ac bus shown in fig. 3) and the other end of the high-voltage winding of the single-phase transformer Ta (T shown in fig. 3)2Terminal) is connected to the second phase line of the grid (the B-phase ac bus shown in fig. 3), and the low-voltage winding of the single-phase transformer Ta is connected to the input side of the power converter CPSC 1.
The first electrode terminal (X shown in fig. 3) on the input side of the power converter CPSC1 in the power conversion device a1Terminal) and one terminal (T shown in fig. 3) of the low-voltage winding of the single-phase transformer Ta3Terminal), the second electrode terminal (X shown in fig. 3) of the input side of the power converter CPSC12Terminal) and the other end (T shown in fig. 3) of the low-voltage winding of the single-phase transformer Ta4End) connection. First electrode terminal (X shown in FIG. 3) of output side of power converter CPSC13Terminal) is connected to the catenary, and the second electrode terminal (X shown in fig. 3) on the output side of the power converter CPSC14End) is connected to the rail.
One end (T shown in fig. 3) of the high-voltage winding of the single-phase transformer Tb in the electric energy conversion device B5Terminal) is connected to the second phase line of the grid (the B ac bus shown in fig. 3) and the other end of the high voltage winding of the single-phase transformer Tb (T shown in fig. 3)6Terminal) is connected to the third phase line of the grid (the C ac bus shown in fig. 3), and the low-voltage winding of the single-phase transformer Tb is connected to the input side of the power converter CPSC 2.
The first electrode terminal (X shown in fig. 3) on the input side of the power converter CPSC2 in the power conversion device B5Terminal) and one end (T shown in fig. 3) of the low-voltage winding of the single-phase transformer Tb7Terminal), the second electrode terminal (X shown in fig. 3) of the input side of the power converter CPSC26Terminal) and the other end (T shown in fig. 3) of the low-voltage winding of the single-phase transformer Tb8End) connection. First electrode terminal (X shown in FIG. 3) of output side of power converter CPSC27Terminal) is connected to the catenary, and the second electrode terminal (X shown in fig. 3) on the output side of the power converter CPSC28End) is connected to the rail.
In another preferred embodiment of this embodiment, the traction substation shown in fig. 3 may further include three power conversion devices. The traction substation according to the present embodiment will be described below with reference to the drawings.
Referring to fig. 4, fig. 4 schematically shows the main structure of the traction substation in the present embodiment. As shown in fig. 4, the first power converter in the traction substation in the present embodiment may include a single-phase transformer Ta and a power converter CPSC1 (for simplicity of description, the power converter is described as power converter a), the second power converter may include a single-phase transformer Tb and a power converter CPSC2 (for simplicity of description, the power converter is described as power converter B), and the third power converter may include a single-phase transformer Tc and a power converter CPSC3 (for simplicity of description, the power converter is described as power converter C).
Specifically, in the present embodiment, the power converter a and the power converter B are respectively the same as the power converter a and the power converter B shown in fig. 3, and for brevity of description, detailed descriptions thereof are omitted here.
In the present embodiment, one end (T shown in fig. 4) of the high-voltage winding of the single-phase transformer Tc in the power conversion device C9Terminal) is connected to the third phase line of the grid (C ac bus shown in fig. 4) and the other end of the high-voltage winding of the single-phase transformer Tc (T shown in fig. 4)10Terminal) is connected to the first phase line of the grid (the a-phase ac bus shown in fig. 4), and the low-voltage winding of the single-phase transformer Tc is connected to the input side of the power converter CPSC 3.
The first electrode terminal (X shown in FIG. 4) on the input side of the power converter CPSC3 in the power conversion device C9Terminal) and one terminal (T shown in fig. 4) of the low-voltage winding of the single-phase transformer Tc11Terminal), the second electrode terminal (X shown in fig. 4) of the input side of the power converter CPSC310Terminal) and the other end of the low-voltage winding of the single-phase transformer Tc (T shown in fig. 4)12End) connection. First electrode terminal (X shown in FIG. 4) of output side of power converter CPSC311Terminal) is connected to the catenary, and the second electrode terminal (X shown in fig. 4) on the output side of the power converter CPSC312End) is connected to the rail.
Further, based on the above traction substation embodiment, the present invention further provides a power supply control method for the traction substation described in the above traction substation embodiment. Next, a power supply control method of a traction substation according to the present invention will be described by taking the traction substation shown in fig. 4 as an example. Specifically, in this embodiment, the power supply control of the traction substation may be performed according to the following steps:
step S101: and carrying out input current closed-loop control on the electric energy converter of each electric energy conversion device in the traction substation according to a preset load power requirement.
In this embodiment, when there are one or three normally operating power converters in the traction substation (e.g. the traction substation includes three power converters and all three power converters normally operate, or the traction substation includes three power converters and two power converters fail, or the traction substation includes two power converters and one power converter fails), the input current set value may be obtained according to the following steps, so as to perform input current closed-loop control on the power converter:
and obtaining an active current given value according to an active power output value of an electric energy converter in the electric energy conversion device and a power grid line voltage corresponding to the electric energy conversion device, and performing input current closed-loop control on the electric energy converter by taking the active current given value as an input current given value. In this embodiment, the phase of the active current given value is the same as the phase of the corresponding grid line voltage, and the amplitude I of the active current given valueMref_pAs shown in the following formula (1):
IMref_p＝2×PM/UM(1)
the meaning of each parameter in the formula (1) is as follows:
PMis the active power output value, U, of the converter corresponding to the Mth converterMIs the amplitude of the grid line voltage corresponding to the mth power conversion device.
The specific operation process of obtaining the given value of the current will be described below by taking the power conversion device a of the traction substation shown in fig. 4 as an example.
For the electric energy conversion device A, the given value i of the input current can be obtained according to the following stepsAref: according to the mains voltage U input to the single-phase transformer TaABAnd active power P of electric energy converter CPSC11Obtaining given value of active current iAref_p. Specifically, the active current setpoint value iAref_pPhase and network line voltage UABHave the same phase and have given value i of active currentAref_pCurrent amplitude I ofAref_pAs shown in the following formula (2):
IAref_p＝2×P1/UAB(2)
further, in this embodiment, when there are two normally operating power converters in the traction substation (for example, the traction substation includes two power converters and both power converters operate normally, or the traction substation includes three power converters and one power converter fails), the input current set value may be obtained according to the following steps, so as to perform input current closed-loop control on the power converter:
firstly, obtaining an active current set value according to a method shown in a formula (1).
And then, obtaining a reactive current given value corresponding to the active current given value according to a preset corresponding relation between the active current and the reactive current. In this embodiment, the phase of the given value of the reactive current differs by 90 ° from the phase of the corresponding line voltage, the amplitude I of the given value of the reactive currentMref_qAs shown in the following formula (3):
IMref_q＝IMref_p×tan(30°) (3)
and finally, calculating an input current given value corresponding to input current closed-loop control of the electric energy converter according to the active current given value and the reactive current given value. Input current given value i in this embodimentMrefAs shown in the following formula (4):
iMref＝iMref_p+iMref_q(4)
the meaning of each parameter in the formula (4) is as follows:
iMref_pis the given value of the active current, i, corresponding to the Mth electric energy conversion deviceMref_qIs the reactive current set value corresponding to the Mth electric energy conversion device.
The specific operation process for obtaining the given current value will be described below by taking the traction substation shown in fig. 4 as an example (assuming that the power converter CPSC3 corresponding to the power converter C fails).
For the electric energy conversion device A, the given value i of the input current can be obtained according to the following stepsAref: firstly, obtaining an active current given value i according to a method shown in a formula (1)Aref_pAmplitude of (I)Aref_p. Then, obtaining a given reactive current value i according to a method shown in a formula (3)Aref_qAmplitude of (I)Aref_q. Finally, calculating according to a method shown in a formula (4) to obtain a given value i of the input currentAref. Wherein the given value of active current iAref_pPhase and network line voltage UABAre the same, and a given value i of reactive currentAref_qPhase ratio grid line voltage UABIs advanced by 90 deg..
For the electric energy conversion device B, the given value i of the input current can be obtained according to the following stepsBref: firstly, obtaining an active current given value i according to a method shown in a formula (1)Bref_pAmplitude of (I)Bref_p. Then, obtaining a given reactive current value i according to a method shown in a formula (3)Bref_qAmplitude of (I)Bref_q. Finally, calculating according to a method shown in a formula (4) to obtain a given value i of the input currentBref. Wherein the given value of active current iBref_pPhase and network line voltage UBCAre the same, and a given value i of reactive currentBref_qPhase ratio grid line voltage UBCLags the phase by 90.
In this embodiment, after the power converter CPSC3 fails, the power converter CPSC1 and the power converter CPSC2 can still operate normally, so that the traction substation can continuously output a supply voltage with unchanged voltage amplitude and phase to the catenary in a derating output manner (the output power of the traction substation is reduced to 2/3 of the original output power). Meanwhile, the given values of the input currents of the power converter CPSC1 and the power converter CPSC2 contain reactive currents, so that the grid-side negative-sequence current can be eliminated.
Step S102: and carrying out output voltage closed-loop control on the electric energy converter of a certain electric energy conversion device, and carrying out output current closed-loop tracking control on the electric energy converters of other electric energy conversion devices by taking the output current of the electric energy converter of the certain electric energy conversion device as a target value.
The voltage/current control process will be described below by taking the traction substation shown in fig. 4 as an example (assuming that the power conversion devices a to C are all operating normally).
For example, the output voltage closed loop control is performed on the power converter CPSC1 of the power conversion device a, and the output current closed loop tracking control is performed on the power converter CPSC2 of the power conversion device B and the power converter CPSC3 of the power conversion device C with the output current of the power converter CPSC1 as a target value.
For another example, the output voltage closed loop control is performed on the power converter CPSC2 of the power conversion device B, and the output current closed loop tracking control is performed on the power converter CPSC1 of the power conversion device a and the power converter CPSC3 of the power conversion device C with the output current of the power converter CPSC2 as a target value.
For another example, the output voltage closed-loop control is performed on the electric energy converter CPSC3 of the electric energy conversion device C, and the output current closed-loop tracking control is performed on the electric energy converter CPSC1 of the electric energy conversion device a and the electric energy converter CPSC2 of the electric energy conversion device B with the output current of the electric energy converter CPSC3 as a target value.
When different transformers are connected to the same power grid line voltage, there may be no current in a certain phase winding of the high-voltage winding of the transformer (that is, the current on the high-voltage side of the transformer is asymmetric, which may cause the power grid to generate a negative-sequence current), and at this time, the negative-sequence current in the power grid cannot be compensated by adjusting the input currents of different converters. In this embodiment, when the traction substation includes three power conversion devices (the traction substation shown in fig. 4), the single-phase transformer of each power conversion device is connected to a different grid line voltage, so that the current asymmetry problem will not occur, that is, the negative-sequence current will not be generated in the grid. When the traction substation comprises two electric energy conversion devices (shown in fig. 3) connected with different line voltages, under the condition that the output power of each electric energy conversion device is ensured to be the same, reactive current compensation is carried out on the electric energy converter of each electric energy conversion device, and negative sequence current compensation can be carried out on the power grid only by ensuring that reactive current with the same amplitude is supplemented to each electric energy converter (namely, a reactive current set value is introduced in input current closed-loop control).
Those skilled in the art will appreciate that the devices of the system of the embodiments can be adaptively changed and placed in one or more systems different from the embodiments. The apparatuses of the embodiments may be combined into one apparatus, and furthermore, they may be divided into a plurality of sub-apparatuses. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes of any system or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The words "comprising" and "comprises" do not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed PC. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (9)
1. The power supply control method of the traction substation is characterized in that the traction substation comprises a plurality of electric energy conversion devices, and each electric energy conversion device comprises a single-phase transformer and an electric energy converter; the high-voltage winding of each single-phase transformer is respectively connected with two different phase lines in a power grid, and the low-voltage winding of each single-phase transformer is connected with the input side port of the corresponding electric energy converter; the output side port of each electric energy converter is respectively connected with a contact net and a steel rail; the power supply control method comprises the following steps:
performing input current closed-loop control on the electric energy converter of each electric energy conversion device in the traction substation according to a preset load power requirement,
and carrying out output voltage closed-loop control on the electric energy converter of a certain electric energy conversion device, and carrying out output current closed-loop tracking control on the electric energy converters of other electric energy conversion devices by taking the output current of the electric energy converter of the certain electric energy conversion device as a target value.
2. The power supply control method of the traction substation according to claim 1, wherein when one or three normally operating power conversion devices are present in the traction substation, the step of performing input current closed-loop control on the power converter of each power conversion device in the traction substation comprises:
obtaining an active current given value according to an active power output value of an electric energy converter in the normally-operated electric energy conversion device and a power grid line voltage corresponding to the normally-operated electric energy conversion device;
and performing input current closed-loop control on the electric energy converter by taking the active current given value as an input current given value.
3. The power supply control method for the traction substation according to claim 1, wherein when there are two normally operating power conversion devices in the traction substation, the step of performing input current closed-loop control on the power converter of each power conversion device in the traction substation includes:
obtaining an active current given value according to an active power output value of an electric energy converter in the normally-operated electric energy conversion device and a power grid line voltage corresponding to the normally-operated electric energy conversion device;
obtaining a reactive current given value corresponding to the active current given value according to a preset corresponding relation between the active current and the reactive current;
and calculating an input current given value according to the active current given value and the reactive current given value so as to perform input current closed-loop control on the electric energy converter.
4. The power supply control method of the traction substation according to claim 2, wherein the phase of the active current given value is the same as the phase of the corresponding grid line voltage, and the amplitude of the active current given value is:
I Mref_p=2×P M/U M
wherein, theI Mref_pIs the amplitude of the active current set value corresponding to the Mth electric energy conversion deviceP MIs an active power output value of a power converter corresponding to the Mth power conversion deviceU MIs the amplitude of the grid line voltage corresponding to the mth power conversion device.
5. The power supply control method of the traction substation according to claim 3, wherein the phase of the given reactive current value is different from the phase of the corresponding grid line voltage by 90 °, and the amplitude of the given reactive current value is:
I Mref_q=I Mref_p×tan(30°)
wherein, theI Mref_qIs the amplitude of the given reactive current value corresponding to the Mth electric energy conversion deviceI Mref_pIs the amplitude of the active current set value corresponding to the Mth electric energy conversion device.
6. The power supply control method of the traction substation according to claim 3, wherein the input current set value is:
i Mref=i Mref_p+i Mref_q
wherein, thei Mref、i Mref_p Andi Mref_q the input current given value, the active current given value and the reactive current given value which correspond to the Mth electric energy conversion device are respectively set.
7. The power supply control method for a traction substation according to claim 1, wherein the power converter is an ac-ac converter.
8. The power supply control method for a traction substation according to claim 7, wherein the power supply control method further comprises the step of controlling the power supply to the traction substation,
the voltage ratio of each single-phase transformer is the same;
the capacity of each of the power converters is the same.
9. The power supply control method for a traction substation according to claim 1, 7 or 8, wherein the number of said power conversion devices is 2 or 3.
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