CN117477606B - Traction power supply power equalization and adjustment method and device based on bidirectional converter - Google Patents

Traction power supply power equalization and adjustment method and device based on bidirectional converter Download PDF

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Publication number
CN117477606B
CN117477606B CN202311814210.XA CN202311814210A CN117477606B CN 117477606 B CN117477606 B CN 117477606B CN 202311814210 A CN202311814210 A CN 202311814210A CN 117477606 B CN117477606 B CN 117477606B
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traction
section
power supply
voltage
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CN117477606A (en
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杨嘉琛
董志杰
魏建忠
李波
杨振龙
赵建军
刘聪
尚国旭
刘通
段启凡
陈翼龙
侯东光
王维广
顾赛
赵喜军
杨凡
常明远
晏寒
吴越
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China Railway Design Corp
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China Railway Design Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

The invention relates to a traction power supply power balancing and adjusting method based on a bidirectional converter, wherein traction and an electric power system share medium-voltage ring network power supply, a double-ring network partition mode is adopted, two independent cable loops are led to supply power by a main transformer substation, the main transformer substation is in a parallel power supply mode of two transformers and respectively supplies power for a section I bus and a section II bus, and the method comprises the following steps: acquiring length data of a power supply section of a traction substation along a railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat; calculating total load of I section bus through acquired dataS Ta Total load of section II busS Tb According to the working conditions in the bilateral power supply interval, a substation voltage output matrix control strategy is formed, and voltage output values of traction stations along the line are adjusted, so that total loads are distributed in adjacent main substations or I-section and II-section buses of the main transformer in an equalizing mode; the invention greatly improves the operation quality of the traction power supply system.

Description

Traction power supply power equalization and adjustment method and device based on bidirectional converter
Technical Field
The invention belongs to the technical field of traction power supply, and particularly relates to a traction power supply power balancing and adjusting method and device based on a bidirectional converter.
Background
The urban rail transit power supply system in China adopts a 110/35kV two-stage centralized power supply mode, the traction power supply system adopts a DC1500V overhead contact system power supply mode, and the power supply system adopts an AC400V voltage level. The traction and power system share the medium-voltage ring network for power supply, and a double-ring network partition mode is adopted, so that two independent cable loops led by a main transformer substation are used for power supply. At present, a traction power supply system generally adopts a rectifying transformer to realize electric energy conversion from a medium-voltage ring network to a traction network, the rectifying transformer consists of a step-down transformer and a rectifier, wherein the rectifier adopts an uncontrolled diode rectifying mode, and cannot actively control a voltage value output by a traction substation. In addition, because the 110kV main transformer station is in a parallel power supply mode of two transformers, which respectively supply power to the I section bus and the II section bus, the power illumination load is evenly distributed on the two section buses according to the load calculation condition, and the traction load is alternately connected into the two section buses according to the sequence along the line, so that the load rates of the adjacent main transformer station or the two main transformers have larger deviation in the operation process and cannot be adjusted. With the gradual application of the bidirectional converter technology in the urban rail transit power supply system, the regenerative braking energy is effectively utilized, a new thought is provided for traction power supply control, the power electronic device is utilized to realize direct-current side amplitude adjustment and alternating-current side phase control on the output voltage of the traction converter, the balanced distribution and adjustment of the traction power supply are realized on the premise of ensuring the power factor, and the running quality of the urban rail transit power supply system is effectively improved.
Disclosure of Invention
The invention solves the technical problems by adopting the following technical scheme:
traction power supply power balancing and adjusting method based on bidirectional converters, traction and power systems share medium-voltage ring network power supply, a double-ring network partition mode is adopted, two independent cable loops are led to supply power by a main transformer substation, the main transformer substation is in a parallel power supply mode of two transformers, and power is respectively supplied to a section I bus and a section II bus, and the method comprises the following steps:
acquiring length data of a power supply section of a traction substation along a railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
calculating total load of I section bus through acquired dataS Ta Total load of section II busS Tb According to the working conditions in the bilateral power supply interval, a substation voltage output matrix control strategy is formed, and voltage output values of traction stations along the line are adjusted, so that total loads are distributed in adjacent main substations or I-section and II-section buses of the main transformer in an equalizing mode.
Further, the working conditions in the bilateral power supply interval comprise a traction working condition, a regenerative braking working condition and an idle working condition.
Further, when the working condition in the bilateral power supply interval is a traction working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter module in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal.
Further, when the working condition in the bilateral power supply interval is a regenerative braking working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta <0 orS Tb <0, representing that the feedback energy of the bus exceeds the load electricity consumption, and increasing the output voltage of the corresponding bus regenerative braking energy bidirectional converter to enable the regenerative braking energy to be input to other buses, so that the utilization rate of the regenerative braking energy in a power supply system is improved;
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta <0 and 0S Tb <And 0, representing that the feedback energy of the main transformer substation exceeds the power consumption of two sections of bus loads, and returning the regenerated braking energy to the adjacent main substations by adjusting the output voltages of the bidirectional converters in the adjacent two traction substations at the boundary of the two main power supplies, namely, adjusting the output voltage value of the traction transformer substation in the power supply range of the main power supply to lower the output voltage value of the traction transformer substation in the power supply range of the adjacent main power supplies.
Further, when the working condition in the bilateral power supply interval is an idle working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal.
Further, the working condition in the bilateral power supply interval is no-loadDuring working conditions, traction load is not generated in the section, and total load of the bus in section IS Ta The total load of the section II bus is determined by the power illumination load distribution.
Further, the total load of the I-section busS Ta Total load of section II busS Tb The acquisition method of (1) comprises the following steps:
calculating the I-section bus load matrix by analyzing the voltage-current relationship among all nodes in the power supply loopAnd section II busbar load matrix->Thereby obtaining the total load of the I-section busS Ta Total load of section II busS Tb 。
Traction power supply power equalization and regulation device based on bidirectional converter, traction and power system share medium voltage looped network power supply, adopts double loop network partition mode, two paths of independent cable loops power supply are led by main transformer substation, the main transformer substation is two transformers in parallel power supply mode, and is I section bus and II section bus power supply respectively, the device includes:
the data acquisition module is used for acquiring length data of a power supply section of the traction substation along the railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
the substation voltage output matrix control strategy forming module is used for calculating total load of the I-section bus through the acquired dataS Ta Total load of section II busS Tb And forming a voltage output matrix control strategy of the substation according to the working conditions in the bilateral power supply interval, and adjusting the voltage output value of the traction station along the line.
An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the bi-directional converter based traction power balancing and regulating method.
A computer readable storage medium storing a computer program which when executed by a processor implements the bi-directional converter based traction power balancing and regulating method.
The invention has the advantages and positive effects that:
according to the invention, the outlet voltage of the traction substation is flexibly controlled through the bidirectional converter, so that the traction power in the traction network has controllable and transferability, the fluctuation amplitude of the network voltage and the installation capacity of the traction transformer can be reduced, the autonomous traction power supply power regulation function of the direct-current traction power supply network is realized, the power supply loads of adjacent main substations or the I-section bus and the II-section bus of the main substation are balanced, the absorption and effective utilization of regenerative braking energy in the power supply system are promoted, and the operation quality of the traction power supply system is greatly improved.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a diagram of the operation and structure of a traction power supply power balancing and regulating method based on a bidirectional converter (between a section I bus and a section II bus of a main transformer);
FIG. 2 is a diagram of the operation structure of the bidirectional converter-based traction power supply power balancing and adjusting method (between adjacent main transformer stations);
FIG. 3 is a schematic diagram of regenerative braking energy flow during traction conditions;
FIG. 4 is a schematic diagram of regenerative braking energy flow during a regenerative braking condition;
FIG. 5 is a schematic diagram of regenerative braking energy flow between adjacent main substations.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein, or any single feature shown or implied in the figures, may nevertheless be continued in any combination or pruning between these features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity of the drawing, identical or similar features may be indicated at one point in the same drawing.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Example 1
As shown in fig. 1 to 5, the traction power supply power balancing and adjusting method based on the bidirectional converter provided in this embodiment uses a dual-loop network partition mode to supply power to a traction and power system by using two independent cable loops led by a main transformer substation, and the main transformer substation supplies power to two transformers in parallel, and supplies power to a section I bus and a section II bus respectively, where the method includes the following steps:
acquiring length data of a power supply section of a traction substation along a railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
calculating an I-section bus load matrix by analyzing the voltage-current relationship among nodes in a power supply loop, wherein the nodes refer to access points of each power supply or load on a power supply pathAnd section II busbar load matrixThereby obtaining the total load of the I-section busS Ta Total load of section II busS Tb According to double pairsAnd working conditions in the side power supply interval form a voltage output matrix control strategy of the substation, and voltage output values of traction stations along the line are adjusted.
Specifically, the working conditions in the bilateral power supply interval include a traction working condition, a regenerative braking working condition and an idle working condition.
When the working condition in the bilateral power supply interval is a traction working condition, that is, the load point voltage in the interval is lower than the bus voltage at two ends of the bilateral power supply interval, the total load of the bus of section I and the total load of the bus of section II are calculated through a bus load matrix, and as shown in fig. 3, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter module in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal.
When the working condition in the bilateral power supply interval is a regenerative braking working condition, namely the load point voltage in the interval is higher than the bus voltage at two ends of the bilateral power supply interval, the total load of the bus of the section I is calculated through a bus load matrixS Ta Total load of section II busS Tb As shown in fig. 4, the substation voltage output matrix control strategy is:
if it isS Ta <0 orS Tb <0, the feedback energy of the bus exceeds the load electricity consumption, and the output voltage of the bidirectional converter corresponding to the bus regenerative braking energy is regulated upThe regenerative braking energy is input to other buses, so that the utilization rate of the regenerative braking energy in the power supply system is improved;
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta <0 and 0S Tb <And 0, representing that the feedback energy of the main transformer substation exceeds the power consumption of two sections of bus loads, and returning the regenerated braking energy to the adjacent main substations by adjusting the output voltages of the bidirectional converters in the adjacent two traction substations at the boundary of the two main power supplies, namely, adjusting the output voltage value of the traction transformer substation in the power supply range of the main power supply to lower the output voltage value of the traction transformer substation in the power supply range of the adjacent main power supplies.
When the working condition in the bilateral power supply interval is no-load working condition, namely no traction load exists in the interval, and the total load of the bus of the section IS Ta The total load of the section II bus is determined by the power illumination load distribution, a bidirectional converter and a traction network in an adjacent traction substation can be utilized to provide auxiliary channels for loads, the load balance distribution of the section I bus and the section II bus is realized, and the voltage output matrix control strategy of the substation is as follows:
when no-load working condition exists in the bilateral power supply interval, namely no traction load exists in the interval, and the total load of the bus of the section IS Ta Total load of section II bus is controlled by powerThe open load distribution is determined, and the bidirectional converters and the traction network in the adjacent traction substation can be used for providing auxiliary channels for loads, so that the load balance distribution of the section I bus and the section II bus is realized.
If it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal.
The hardware equipment of the traction power supply power balancing and adjusting method based on the bidirectional converter comprises a power supply module, a CPU module, a data communication module and a control module which are connected with an internal connection module; the power module takes electricity from the AC screen or the DC screen of the traction station to provide electric energy for the whole equipment; the CPU module is connected with a data acquisition interface in the traction station, and the control module is connected with a comprehensive control interface of the traction station; the internal connection module comprises a power supply and a data communication channel between the modules; the power module, the CPU module, the data communication module and the control module are all connected with the internal connection module, so that the sharing of the internal power supply of the equipment and the data interaction are realized.
In addition, the bidirectional converter adopts an AC-DC-AC structure, so that the amplitude and the phase of the output voltage can be completely controlled, and the output voltage of the traction station can be adjusted by adjusting the output voltage of the bidirectional converter.
Example 2
Based on the same inventive concept, the embodiment of the application also provides a traction power supply power balancing and adjusting device based on a bidirectional converter, wherein traction and an electric system share a medium-voltage ring network for power supply, a double-ring network partition mode is adopted, two independent cable loops are led by a main transformer substation for power supply, the main transformer substation is in a parallel power supply mode for two transformers for respectively supplying power for a section I bus and a section II bus, and the device comprises:
the data acquisition module is used for acquiring length data of a power supply section of the traction substation along the railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
the substation voltage output matrix control strategy forming module is used for calculating total load of the I-section bus through the acquired dataS Ta Total load of section II busS Tb Forming a voltage output matrix control strategy of the substation according to the working conditions in the bilateral power supply interval, and adjusting the voltage output value of the traction station along the line;
based on the same inventive concept, the embodiment of the application also provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the bi-directional converter based traction power balancing and regulating method described above; it should be noted that the electronic device may include, but is not limited to, a processing unit, a storage unit; those skilled in the art will appreciate that the inclusion of a processing unit, a storage unit, and a memory unit in an electronic device is not limiting of a computing device, and may include additional components, or may combine certain components, or different components, e.g., an electronic device may also include an input-output device, a network access device, a bus, etc.
A computer readable storage medium storing a computer program which when executed by a processor implements the bi-directional converter based traction power balancing and regulating method described above; the readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing; the program embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. For example, program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the C programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, or entirely on a remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected over the Internet using an Internet service provider).
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims (8)

1. Traction power supply power balancing and adjusting method based on bidirectional converter, traction and electric power system share medium voltage ring network power supply, adopts double ring network partition mode, two independent cable loops are led by main transformer station to supply power, the main transformer station is two transformers in parallel power supply mode, and respectively supplies power for I section bus and II section bus, characterized in that the method comprises the following steps:
acquiring length data of a power supply section of a traction substation along a railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
calculating total load of I section bus through acquired dataS Ta Total load of section II busS Tb According to the working conditions in the bilateral power supply interval, a substation voltage output matrix control strategy is formed, and voltage output values of traction stations along the line are adjusted, so that total loads are distributed in adjacent main substations or I-section and II-section buses of the main transformer in an equalizing mode;
the working conditions in the bilateral power supply interval comprise a traction working condition or a regenerative braking working condition;
when the working condition in the bilateral power supply interval is a traction working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter module in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
when the working condition in the bilateral power supply interval is a regenerative braking working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta <0 orS Tb <0, representing that the feedback energy of the bus exceeds the load electricity consumption, and increasing the output voltage of the corresponding bus regenerative braking energy bidirectional converter to enable the regenerative braking energy to be input to other buses, so that the utilization rate of the regenerative braking energy in a power supply system is improved;
if it isS Ta ＞S Tb The output voltage of traction which is connected with the traction bus and the I section bus is regulated upOr the output voltage of the traction bus connected with the section II bus is regulated down to form a voltage optimization regulation matrix, and the voltage optimization regulation matrix is sent to a bidirectional converter in the traction substation to ensure that the total load of the section I bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta <0 and 0S Tb <And 0, representing that the feedback energy of the main transformer substation exceeds the power consumption of two sections of bus loads, and returning the regenerated braking energy to the adjacent main substations by adjusting the output voltages of the bidirectional converters in the adjacent two traction substations at the boundary of the two main power supplies, namely, adjusting the output voltage value of the traction transformer substation in the power supply range of the main power supply to lower the output voltage value of the traction transformer substation in the power supply range of the adjacent main power supplies.
2. The bi-directional converter based traction power balance and regulation method of claim 1 wherein the conditions within the bilateral power supply interval further comprise no-load conditions.
3. The bi-directional converter-based traction power supply power balancing and adjusting method according to claim 2, wherein when the working condition in the bilateral power supply interval is an idle working condition, the voltage output matrix control strategy of the substation is:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so thatTotal load of I section busS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal.
4. The bi-directional converter-based traction power supply power balancing and adjusting method according to claim 3, wherein when the working condition in the bilateral power supply interval is an idle working condition, there is no traction load in the interval, and the total load of the bus of section I isS Ta The total load of the section II bus is determined by the power illumination load distribution.
5. The bi-directional converter based traction power balance and regulation method of claim 1, wherein said total load of section I bus isS Ta Total load of section II busS Tb The acquisition method of (1) comprises the following steps:
by analyzing the voltage-current relationship among all nodes in the power supply loop, calculating a load matrix of the I section bus and a load matrix of the II section bus, thereby obtaining the total load of the I section busS Ta Total load of section II busS Tb 。
6. Traction power supply power equalization and regulation device based on bidirectional converter, traction and electric power system share medium voltage looped network power supply, adopts double loop network partition mode, two paths of independent cable loops are led by main transformer substation to supply power, the main transformer substation is two transformers to supply power in parallel, and I section bus and II section bus supply power respectively, characterized in that, the device includes:
the data acquisition module is used for acquiring length data of a power supply section of the traction substation along the railway, and acquiring voltage and current data of a feeder line of each traction substation, wherein the sampling time interval is deltat;
the substation voltage output matrix control strategy forming module is used for calculating total load of the I-section bus through the acquired dataS Ta Total load of section II busS Tb Forming a voltage output matrix control strategy of the substation according to working conditions in a bilateral power supply interval, and adjusting voltage output values of traction stations along the line, wherein the working conditions in the bilateral power supply interval comprise traction working conditions or regenerative braking working conditions;
when the working condition in the bilateral power supply interval is a traction working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter module in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
when the working condition in the bilateral power supply interval is a regenerative braking working condition, the voltage output matrix control strategy of the substation is as follows:
if it isS Ta <0 orS Tb <0, representing that the feedback energy of the bus exceeds the load electricity consumption, and increasing the output voltage of the corresponding bus regenerative braking energy bidirectional converter to enable the regenerative braking energy to be input to other buses, so that the utilization rate of the regenerative braking energy in a power supply system is improved;
if it isS Ta ＞S Tb The output voltage of the traction bus connected with the I section bus is regulated up, or the output voltage of the traction bus connected with the II section bus is regulated down, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta ＜S Tb The output voltage of the traction bus connected with the I section bus is regulated down, or the output voltage of the traction bus connected with the II section bus is regulated up, so as to form a voltage optimization regulating matrix, and the voltage optimization regulating matrix is sent to a bidirectional converter in a traction substation, so that the total load of the I section bus is realizedS Ta Total load with section II busS Tb Equal;
if it isS Ta <0 and 0S Tb <And 0, representing that the feedback energy of the main transformer substation exceeds the power consumption of two sections of bus loads, and returning the regenerated braking energy to the adjacent main substations by adjusting the output voltages of the bidirectional converters in the adjacent two traction substations at the boundary of the two main power supplies, namely, adjusting the output voltage value of the traction transformer substation in the power supply range of the main power supply to lower the output voltage value of the traction transformer substation in the power supply range of the adjacent main power supplies.
7. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 5.
8. A computer readable storage medium storing a computer program which, when executed by a processor, implements the method of any one of claims 1 to 5.
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