Railway flexible traction power supply system and control method thereof

Abstract

The invention relates to a railway flexible traction power supply system and a control method thereof. The system comprises a plurality of substations, a partition station, an autotransformer station, a first flexible power supply device, a second flexible power supply device and an energy management control center. Wherein the substations are connected in parallel with a contact network, a section post is arranged between the adjacent substations, an autotransformer station is arranged between the adjacent substations and the section post, and the first flexible power supply device and the second flexible power supply device are correspondingly connected with the substations and the section post respectively. And controlling the flexible power supply device to realize energy scheduling between power transformation. The system can improve the locomotive regenerative braking energy utilization rate.

Description

Technical Field

[0001] The present application relates to the technical field of railway flexible traction power supply technology, and in particular to a railway flexible traction power supply system and a control method thereof. Background Art

[0002] In the operation of electrified heavy-load railways, there are significant transportation characteristics, namely, heavy loads go up and light loads go down, and the heavy-load direction has a downhill trend, while the light-load direction needs to climb a slope, causing the locomotive to be in a braking condition for a long time during operation, thereby generating a large amount of regenerative braking energy, which is difficult to fully utilize.

[0003] At the same time, the existing traction power supply system adopts a segmented power supply mode. This mode makes it impossible to achieve energy integration between the two-phase busbars of the traction substation and between multiple traction substations, which greatly limits the system's ability to absorb regenerative braking energy. It not only causes energy waste, but also leads to increased electricity costs, and urgently needs improvement and innovation. Summary of the Invention

[0004] Based on this, it is necessary to provide a railway flexible traction power supply system and a control method thereof to address the above technical problems.

[0005] In a first aspect, the present application provides a railway flexible traction power supply system, the system comprising: a plurality of substations, a plurality of substations, a plurality of autotransformer substations, a plurality of first flexible power supply devices, a plurality of second flexible power supply devices, and an energy management control center;

[0006] Multiple substations are connected in parallel to the overhead line. A substation is installed on the overhead line between every two adjacent substations, and an autotransformer is installed on the overhead line between every adjacent substation and substation.

[0007] A plurality of first flexible power supply devices are connected to the substations in a one-to-one correspondence via the contact network;

[0008] A plurality of second flexible power supply devices are connected to the sub-districts in a one-to-one correspondence via the contact network;

[0009] The energy management control center is connected to multiple first flexible power supply devices and multiple second flexible power supply devices respectively. The energy management control center controls the first flexible power supply device and the second flexible power supply device to realize energy scheduling between substations based on the electrical quantity data of the substation collected by the first flexible power supply device and the electrical quantity data of the substation collected by the second flexible power supply device, as well as the location and number of substations.

[0010] In one embodiment, the first flexible power supply device is also used to connect to an energy storage device and / or a photovoltaic device.

[0011] In one embodiment, the first flexible power supply device includes:

[0012] a first access feeder system, wherein a first end of the first access feeder system is connected to a first end of a substation via a contact network;

[0013] a second access feeder system, wherein a first end of the second access feeder system is connected to a second end of the substation via a contact network;

[0014] a first three-phase transformer, wherein a first side of the first three-phase transformer is connected to a second end of the first access feed system and a second end of the second access feed system respectively;

[0015] A plurality of three-phase converter devices, wherein first ends of the plurality of three-phase converter devices are connected in parallel to the second side of the first three-phase transformer, and second ends of the plurality of three-phase converter devices are used to connect to an energy storage device and / or a photovoltaic device.

[0016] In one embodiment, the first access feeder system and the second access feeder system have the same structure, a bipolar disconnector, a bipolar circuit breaker and a current transformer are connected in series between the first end and the second end of the first access feeder system, and an incoming line lightning arrester is connected in parallel to the first end of the first access feeder system.

[0017] In one embodiment, a three-phase converter device comprises:

[0018] an AC-DC-AC three-bridge-arm converter, wherein a first end of the AC-DC-AC three-bridge-arm converter is connected to the second side of the first three-phase transformer;

[0019] A DC carrier circuit, wherein a first end of the DC carrier circuit is connected to a second end of the AC-DC-AC three-arm converter, and a second end of the DC carrier circuit is used to access an energy storage device and / or a photovoltaic device.

[0020] In one embodiment, the second flexible power supply device includes:

[0021] A third access feeder system, wherein a first end of the third access feeder system is connected to the sub-district office via a contact network;

[0022] a second three-phase transformer, wherein a first side of the second three-phase transformer is connected to the second end of the third access feed system, and a neutral point of the first side coil of the second three-phase transformer is grounded;

[0023] A plurality of AC-DC-AC back-to-back converters are connected in parallel to the second side of the second three-phase transformer.

[0024] In one embodiment, a single-pole disconnector, a single-pole circuit breaker and a current transformer are connected in series in sequence on a branch between the first end of the third access feeder system and the neutral point of the first side coil of the second three-phase transformer, and an incoming line lightning arrester is connected in parallel to the first end of the third access feeder system.

[0025] In a second aspect, the present application further provides a control method for a railway flexible traction power supply system, which is applied to the railway flexible traction power supply system in the above embodiment, and the method includes:

[0026] Obtain electrical quantity data of substations, electrical quantity data of substations, and the location and number of substations;

[0027] According to the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations, the first flexible power supply device and the second flexible power supply device are controlled to realize energy scheduling between the substations.

[0028] In one embodiment, the electrical quantity data of the substation includes a historical power curve of the substation and historical regenerative braking energy data of the substation. Based on the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations, controlling the first flexible power supply device and the second flexible power supply device to achieve energy scheduling between the substations includes:

[0029] Selecting some substations from multiple substations as target substations based on their historical power curves, historical regenerative braking energy data, and the locations and numbers of substations;

[0030] The power supply area of the target substation and the substations adjacent to the target substation is used as the group energy dispatching area;

[0031] Determine the energy dispatching conditions based on the number of substations in the group energy dispatching area, the communication status between substations, and the data collection status of each substation;

[0032] Generate energy dispatch instructions based on energy dispatch conditions and the current operating status of each substation in the group energy dispatch area;

[0033] The energy dispatching instruction is sent to the first flexible power supply device and the second flexible power supply device to realize energy dispatching between the substations.

[0034] In one embodiment, the electrical quantity data of the substation includes a current power curve of the substation and current regenerative braking energy data of the substation. Before the step of generating the energy dispatch instruction based on the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area, the step further includes:

[0035] The current operating state of each substation in the group energy dispatching area is determined according to the current power curve of the substation and the current regenerative braking energy data of the substation; the current operating state includes the traction state and the regenerative braking state.

[0036] The above-mentioned railway flexible traction power supply system and control method thereof have at least the following beneficial effects:

[0037] By continuously monitoring the data collected by each device through the energy management control center, the scheduling strategy is dynamically adjusted to achieve real-time scheduling and optimal distribution of regenerative braking energy, avoiding the waste of regenerative braking energy in a single area or the consumption due to unavailability, and enabling energy to be recycled among multiple substations, thereby fully improving the utilization rate of locomotive regenerative braking energy and achieving the purpose of energy saving and optimizing the operation of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a schematic structural diagram of a railway flexible traction power supply system according to one embodiment;

[0040] Figure 2 Schematic diagram of the structure of a first flexible power supply device in one embodiment;

[0041] Figure 2a for Figure 2 A partially enlarged schematic diagram of the first access feed system and the second access feed system;

[0042] Figure 2b for Figure 2 A partially enlarged schematic diagram of the three-phase converter device;

[0043] Figure 3 is a schematic structural diagram of a second flexible power supply device in one embodiment;

[0044] Figure 3a for Figure 3 A partial enlarged schematic diagram of the third access feeder system;

[0045] Figure 3b for Figure 3 A partial enlarged schematic diagram of CCCC's DC-AC back-to-back converter;

[0046] Figure 4 1 is a flow chart of a control method for a railway flexible traction power supply system according to an embodiment;

[0047] Figure 5 FIG1 is a flowchart illustrating steps for controlling a first flexible power supply device and a second flexible power supply device to implement energy scheduling between substations based on electrical quantity data of substations, electrical quantity data of substations, and the location and number of substations in one embodiment;

[0048] Figure 6 This is a structural block diagram of a control device for a railway flexible traction power supply system according to one embodiment;

[0049] Figure 7 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0050] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0052] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0053] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0054] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0055] In an exemplary embodiment, Figure 1As shown, the present application provides a railway flexible traction power supply system, which includes multiple substations 2, multiple substations 4, multiple autotransformers 6, multiple first flexible power supply devices 8, multiple second flexible power supply devices 10 and an energy management control center 12; multiple substations 2 are connected in parallel to the contact network, and a substation 4 is provided on the contact network between every two adjacent substations 2, and an autotransformer 6 is provided on the contact network between every adjacent substation 2 and substation 4; multiple first flexible power supply devices 8 are connected one-to-one with the substation 2 through the contact network; multiple second flexible power supply devices 10 are connected one-to-one with the substation 4 through the contact network; the energy management control center 12 is respectively connected to the multiple first flexible power supply devices 8 and the multiple second flexible power supply devices 10, and the energy management control center 12 controls the first flexible power supply device 8 and the second flexible power supply device 10 based on the electrical quantity data of the substation 2 collected by the first flexible power supply device 8 and the electrical quantity data of the substation 4 collected by the second flexible power supply device 10, as well as the location and number of the substation 2 to realize energy scheduling between each substation.

[0056] Among them, such as Figure 1 As shown, the contact network refers to the contact wire (such as Figure 1 T line), return rail (such as R line in the figure) and positive feed line (such as Figure 1 The specific connection relationship between each terminal (q, w, n, e, r) of the substation 2 and the contact network, the specific connection relationship between each terminal (q, w, n, e, r) of the substation 4 and the contact network, the specific connection relationship between each terminal (a, b, c, d) of the first flexible power supply device 8 and the contact network, and the specific connection relationship between each terminal (a, n, b) of the second flexible power supply device 10 and the contact network, can be understood by those skilled in the art from the following. Figure 1The first flexible power supply device 8 is connected to the substation 2 via the overhead line in a one-to-one correspondence, capable of collecting electrical quantity data from the substation 2, such as voltage, current, and power, to provide a basis for the energy management and control center 12 to make energy scheduling decisions. It also receives energy scheduling instructions from the energy management and control center 12, and controls the energy related to the substation 2 according to the control signals from the energy management and control center 12. It participates in the energy scheduling process between substations 2 to fully utilize the regenerative braking energy of the locomotive. For example, when a locomotive generates regenerative braking energy within a substation 2 area, the first flexible power supply device 8, under the control of the control center, can adjust the configuration parameters of the substation 2 to assist the second flexible power supply device 10 in allocating this energy to other substations 2 areas in need. The second flexible power supply device 10 is connected to the substation 4 via the overhead line in a one-to-one correspondence, and is used to collect electrical quantity data from the substation 4. This data can reflect the energy distribution of the overhead line near the substation 4, supporting the energy management and control center 12 in understanding the energy status of the entire system. The second flexible power supply device 10 is also connected to the energy management control center 12 and is controlled by it. Under the control of the energy management control center 12, it participates in the energy scheduling between the substations. The substation 4 is set on the contact network between adjacent substations 2. The second flexible power supply device 10 can regulate the energy flow of the contact network between adjacent substations 2 by controlling the substation 4, thereby promoting the transmission and utilization of regenerative braking energy between different substations 2. For example, when there is a difference in energy demand between adjacent substations 2, the second flexible power supply device 10 can cooperate with the first flexible power supply device 8 to achieve reasonable allocation of energy between the two substations 2, so that the energy generated by the regenerative braking of the locomotive can be effectively utilized instead of being wasted or consumed.

[0057] For example, the energy management and control center 12 is connected to these two types of flexible power supply devices, establishing a complete energy dispatch and control system based on a one-to-one connection between the first flexible power supply device 8 and the substation 2, and a one-to-one connection between the second flexible power supply device 10 and the substation 4. Specifically, when locomotives generate regenerative braking energy during operation, this energy is fed back into the overhead contact network. At this point, the first flexible power supply device 8 collects real-time electrical quantity data from the corresponding substation 2, such as voltage, current, and power, while the second flexible power supply device 10 collects electrical quantity data from the substation 4. This data can reflect the energy distribution and flow of the overhead contact network in each area. Based on this real-time collected data and information such as the location and number of substations 2, the energy management and control center 12 analyzes and evaluates the energy status of the entire system. For example, if excess locomotive regenerative braking energy within a substation 2 causes an increase in the overhead contact network voltage or energy accumulation in that area, the energy management and control center 12 will send control instructions to the corresponding first and second flexible power supply devices 8 and 10 based on the energy demand of other substations 2. Upon receiving the command, the first flexible power supply device 8 adjusts the energy output of the substation 2 in which it is located, transferring excess regenerative braking energy via the overhead contact network to areas of the substation 2 with greater energy demand. The second flexible power supply device 10, by controlling the substations 4, adjusts the energy flow path and flow rate of the overhead contact network between adjacent substations 2, facilitating energy transfer between different substations 2. For example, by controlling the switch status or electrical parameters of the substations 4, energy distribution between adjacent substations 2 is optimized, ensuring that regenerative braking energy is efficiently transferred from areas with excess energy to areas with demand.

[0058] In the above-mentioned railway flexible traction power supply system, the energy management control center 12 continuously monitors the data collected by each device, dynamically adjusts the scheduling strategy, and realizes real-time scheduling and optimal distribution of regenerative braking energy, avoiding the waste of regenerative braking energy in a single area or the consumption due to unavailability, so that energy can be recycled among multiple substations 2, thereby fully improving the utilization rate of locomotive regenerative braking energy and achieving the purpose of energy saving and optimizing the operation of the power supply system.

[0059] In an exemplary embodiment, Figure 1 As shown, the first flexible power supply device 8 is also used to connect to an energy storage device and / or a photovoltaic device.

[0060] Among them, such as Figure 1 As shown, the first flexible power supply device 8 is connected to the positive and negative poles of the energy storage device and the positive and negative poles of the photovoltaic device through its DC+ interface and DC- interface respectively.

[0061] For example, when the first flexible power supply device 8 is connected to a photovoltaic device, it can introduce photovoltaic power generation, a clean energy source, into the traction power supply system, achieving multi-source access. The photovoltaic device converts solar energy into electrical energy. The first flexible power supply device 8 collects and regulates the electrical energy it outputs, integrating the photovoltaic power into the overhead power network. Simultaneously, it monitors the photovoltaic device's output power, voltage, and other electrical quantity data in real time and transmits this data to the energy management and control center 12. Based on the generation of photovoltaic power, the energy requirements of each substation 2, and the overall system operating status, the energy management and control center 12 issues instructions to the first flexible power supply device 8, rationally allocating photovoltaic power to ensure smooth system integration and power supply for locomotive operation, thus enriching the energy sources of the traction power supply system. Regarding excess energy storage, when the locomotive generates excess energy from regenerative braking, or when the photovoltaic device output exceeds the system's immediate needs, the first flexible power supply device 8, in accordance with instructions from the energy management and control center 12, directs the excess regenerative braking energy and photovoltaic energy to an energy storage device for storage or transfers it to a substation 2 in traction mode. The first flexible power supply device 8 regulates and converts electrical energy to meet the input requirements of the energy storage device, achieving efficient energy storage. For example, at night when locomotives operate less frequently and the photovoltaic system stops generating electricity, if sufficient energy is stored during the day, this energy can be used later. When the system load is excessive, the energy management control center 12 determines the load situation based on real-time monitored electrical quantity data. If it reaches or exceeds the set maximum demand threshold, it sends a command to the first flexible power supply device 8. After receiving the command, the first flexible power supply device 8 controls the energy storage device to release the stored energy. Under the control of the first flexible power supply device 8, the electrical energy in the energy storage device is output at an appropriate voltage, current, and power, and supplemented to the overhead line to power the locomotive, thereby alleviating the pressure on the power supply system. This method achieves peak load shaving and valley filling, releasing energy during peak load periods, reducing the system's instantaneous high demand on the external power grid, avoiding power supply instability caused by excessive load, effectively reducing maximum demand, improving the stability and economy of the entire traction power supply system, and also improving the utilization efficiency of renewable energy.

[0062] In this embodiment, the energy storage device and / or photovoltaic device are connected through the first flexible power supply device 8. In terms of energy structure, the photovoltaic device is introduced to realize multi-source access, and clean energy is integrated into the traction power supply system, thereby reducing dependence on traditional energy and reducing carbon emissions. In terms of energy management, the excess regenerative braking energy and photovoltaic power are effectively handled and stored through the energy storage device or transferred on demand to avoid energy waste and improve energy utilization. In terms of system operation stability, the energy storage device releases energy when the load is too large, thereby realizing peak shaving and valley filling, reducing the maximum demand, ensuring stable power supply, and reducing the impact of load fluctuations on the system.

[0063] In an exemplary embodiment, Figure 2 As shown, the first flexible power supply device 8 includes a first access feed system 82, a second access feed system 84, a first three-phase transformer 86, and a plurality of three-phase converter devices 88. The first end of the first access feed system 82 is connected to the first end of the substation 2 via the overhead line; the first end of the second access feed system 84 is connected to the second end of the substation 2 via the overhead line; the first side of the first three-phase transformer 86 is connected to the second end of the first access feed system 82 and the second end of the second access feed system 84, respectively; the first ends of the plurality of three-phase converter devices 88 are connected in parallel to the second side of the first three-phase transformer 86, and the second ends of the plurality of three-phase converter devices 88 are used to connect to an energy storage device and / or a photovoltaic device.

[0064] The first access feed system 82 and the second access feed system 84 can both be 55kV access feed systems, and the first three-phase transformer 86 can be a V / V three-phase transformer. Figure 2 The a and b ends shown in the figure) are connected to the first end of the substation 2 (as shown in the figure) through the contact network. Figure 1 The q end and the w end shown in FIG); the first end of the second access feed system 84 (such as Figure 2 The c and d ends shown in the figure) are connected to the second end of the substation 2 (as shown in the figure) through the contact network. Figure 1 The first side of the first three-phase transformer 86 is connected to the second end of the first access feed system 82 and the second end of the second access feed system 84, respectively; the first ends of the multiple three-phase converter devices 88 are connected in parallel to the second side of the first three-phase transformer 86, and the second ends of the multiple three-phase converter devices 88 are used to connect to the energy storage device and / or the photovoltaic device.

[0065] For example, the first access feeder system 82 and the second access feeder system 84 of the first flexible power supply device 8 are connected to both ends of the substation 2 via the overhead line, establishing a stable energy transmission channel. When the photovoltaic device generates electricity, multiple three-phase converter devices 88 convert the DC power output of the photovoltaic device into AC power. Voltage conversion and electrical isolation are achieved with the help of the first three-phase transformer 86, and the photovoltaic power is then coupled to the overhead line power supply system, successfully achieving multi-source energy access to the traction power supply system. When the locomotive regenerative braking energy or excess photovoltaic energy is generated, the three-phase converter device 88 rectifies the excess energy into DC power, which is stored in the energy storage device through the first three-phase transformer 86 and the access feeder system. During this process, the three-phase converter device 88 can precisely adjust the power parameters to adapt to the charging needs of the energy storage device, ensuring efficient energy storage. When the system load is too large, the energy management control center 12 detects that the demand exceeds the threshold and triggers the energy storage device to release energy. The three-phase converter device 88 inverts the stored DC power into AC power, boosts the voltage through the first three-phase transformer 86, and then flexibly distributes it to the contact network through the first access feed system 82 and the second access feed system 84. According to the actual load conditions of each substation 2, the distribution ratio of the two energy channels can be dynamically adjusted to optimize the transmission path, achieve precise peak shaving and valley filling, and reduce the maximum demand. In addition, the first flexible power supply device 8 can also monitor the power factor, harmonic distortion rate and three-phase imbalance of the load in real time. When a power factor deviation is detected, the three-phase converter device 88 can operate in a reactive power generation mode, dynamically injecting or absorbing reactive power to improve the system power factor; and for harmonic problems, the converter device generates a reverse compensation current through harmonic current detection and tracking control to offset harmonic pollution; in the face of three-phase imbalance, the three-phase converter device 88 can adjust the output current amplitude and phase of each phase to balance the three-phase load, thereby achieving reactive power supplementation, harmonic control and negative sequence compensation, comprehensively improving the power quality, and ensuring that the entire traction power supply system maintains stable and reliable operation while efficiently utilizing multi-source energy.

[0066] In this embodiment, by adopting the first access feed-out system 82 and the second access feed-out system 84 to connect the two ends of the substation 2, and cooperating with the first three-phase transformer 86, a stable and efficient energy transmission architecture is constructed, providing a solid foundation for multi-source energy access; multiple three-phase converter devices 88 realize the AC / DC conversion of photovoltaic power, the rectification and storage of excess regenerative braking energy and photovoltaic energy, and the inversion release of energy from the energy storage device, effectively realizing multi-source energy access, storage and peak shaving, reducing the maximum demand, and improving energy utilization efficiency; at the same time, the three-phase converter device 88 is based on real-time monitoring of the load power factor, harmonic distortion rate and three-phase imbalance, and performs targeted reactive power supplementation, harmonic control and negative sequence compensation, thereby comprehensively improving the power quality, reducing equipment loss, extending the equipment service life, ensuring the stable and reliable operation of the traction power supply system, and reducing the risk of failure caused by power quality problems.

[0067] In an exemplary embodiment, Figure 2a As shown, the first access feeder system 82 and the second access feeder system 84 have the same structure, and a bipolar disconnector, a bipolar circuit breaker and a current transformer are connected in series between the first end and the second end of the first access feeder system 82, and an incoming line lightning arrester is connected in parallel to the first end of the first access feeder system 82.

[0068] Among them, Figure 2a As shown, a bipolar disconnector QS11, a bipolar circuit breaker DL1, and a current transformer 11LH are sequentially connected in series between the first and second ends of the first access feeder system 82, and an incoming line lightning arrester 1BL is connected in parallel to the first end of the first access feeder system 82. A bipolar disconnector QS21, a bipolar circuit breaker DL2, and a current transformer 21LH are sequentially connected in series between the first and second ends of the second access feeder system 84, and an incoming line lightning arrester 2BL is connected in parallel to the first end of the first access feeder system 82.

[0069] In this embodiment, the bipolar isolating switches (QS11, QS21) can safely disconnect the system from external circuits during equipment maintenance and fault isolation, ensuring the safety of maintenance personnel and the convenience of system maintenance, while also facilitating flexible switching of system operating modes. The bipolar circuit breakers (DL1, DL2) can control the on / off state of the circuit during normal operation and quickly disconnect the circuit when a fault such as an overload or short circuit occurs in the system, effectively protecting the safety of subsequent equipment and lines and preventing the expansion of the fault range. The current transformers (11LH, 21LH) can accurately collect current signals in the circuit and provide real-time and accurate current data to the energy management control center 12 and other monitoring equipment, facilitating the monitoring and regulation of system energy flow. The incoming line lightning arresters (1BL, 2BL) are connected in parallel to the first end of the system to effectively suppress lightning overvoltage and switching overvoltage, preventing instantaneous high voltages such as lightning from damaging equipment within the system, enhancing the system's anti-interference capability and operational reliability, thereby ensuring the stable, safe, and efficient operation of the entire railway flexible traction power supply system and reducing maintenance costs and the risk of operational interruption due to equipment failure.

[0070] In an exemplary embodiment, Figure 2b As shown, the three-phase converter device 88 includes a three-leg AC-DC-AC converter and a DC carrier circuit. The first end of the AC-DC-AC converter is connected to the second side of the first three-phase transformer 86. The first end of the DC carrier circuit is connected to the second end of the AC-DC-AC converter. The second end of the DC carrier circuit is connected to the energy storage device and / or photovoltaic device.

[0071] For example, a three-leg AC-DC-AC converter is connected to the second side of the first three-phase transformer 86, converting the transformer's output AC power into DC power. This DC power is then inverted back to AC power for output based on actual demand, achieving energy integration between the transformer's two ports through bidirectional energy conversion. During operation, the load conditions at both ports are monitored in real time. By flexibly adjusting the direction and magnitude of energy flow, the loads at both ports are balanced, fully utilizing the transformer's capacity, avoiding excessive loads on any one port, and reducing the port overload multiple. When locomotive regenerative braking generates excess energy or the photovoltaic device outputs excess power, the DC carrier circuit (DC-DC) adapts and converts this energy and stores it in an energy storage device. When the system load is excessive, the DC carrier circuit (DC-DC) controls the energy storage device to release energy, which is then converted and replenished to the system, achieving peak load shaving and valley filling, reducing maximum demand. Furthermore, the DC carrier circuit (DC-DC) can process the DC power generated by the photovoltaic device to meet the requirements for connection to the traction power supply system, thereby enabling multi-source access, enriching the system's energy sources, and improving overall system performance.

[0072] In this embodiment, the bidirectional energy conversion function of the AC-DC-AC three-leg converter effectively integrates the energy of the transformer's two ports, dynamically balancing the load and significantly reducing the risk of port overload, ensuring stable equipment operation and extending its service life. The DC-DC carrier circuit establishes a flexible energy storage and allocation system that can not only efficiently store excess regenerative braking energy from locomotives and excess photovoltaic power, but also release stored energy during peak system loads to smooth peaks and fill valleys, reducing maximum demand and saving electricity costs. At the same time, its adaptive processing of photovoltaic power enables multi-source energy access, enriching the system's energy structure and improving the utilization rate of renewable energy. The two work together to comprehensively enhance the reliability of the railway's flexible traction power supply system.

[0073] In an exemplary embodiment, Figure 3 As shown, the second flexible power supply device 10 includes a third access feeder system 102, a second three-phase transformer 104, and multiple AC / DC / AC back-to-back converters 106. The first end of the third access feeder system 102 is connected to the substation 4 via the overhead line; the first side of the second three-phase transformer 104 is connected to the second end of the third access feeder system 102, and the neutral point of the first side coil of the second three-phase transformer 104 is grounded; and the multiple AC / DC / AC back-to-back converters 106 are connected in parallel to the second side of the second three-phase transformer 104.

[0074] The first end of the third access feed system 102 (such as Figure 3 The a and b ends shown in FIG are connected to the partition 4 via the contact network; the first side of the second three-phase transformer 104 is connected to the second end of the third access feed system 102, and the neutral point of the first side coil of the second three-phase transformer 104 (as shown in FIG Figure 3 The N terminal shown in Figure 1 is grounded.

[0075] For example, the third access feeder system 102 serves as a key bridge connecting the substation 4 with subsequent equipment. Its first end is connected to the substation 4 via the overhead line. It collects real-time power and voltage data from both sides of the substation 4 and rapidly transmits this information to the energy dispatch management and control center. Furthermore, the system can receive commands from the control center, providing the foundation and command transmission channel for subsequent energy dispatch and voltage regulation operations. The first side of the second three-phase transformer 104 is connected to the second end of the third access feeder system 102, with the neutral point of the first-side coil grounded. This connection ensures the system's electrical safety and stable operation. It converts the electrical energy received from the third access feeder system 102 to a voltage level that meets the operating requirements of the subsequent AC / DC / AC back-to-back converter 106. It also electrically isolates upstream and downstream equipment, enhancing system safety and reliability. Multiple AC / DC / AC back-to-back converters 106 are connected in parallel to the second side of the second three-phase transformer 104, forming the core execution unit for energy dispatch and voltage stability. After the energy dispatch management and control center calculates the energy dispatch value based on the power information on both sides of substation 4, it sends instructions to the AC / DC / AC back-to-back converters 106. These converters can flexibly control the bidirectional flow of energy according to these instructions, transferring excess energy generated by regenerative braking from substation 2 on the side with excess power, through substation 4, to substation 2 on the other side with greater power demand. This achieves efficient utilization of regenerative braking energy and avoids energy waste. Regarding voltage stability, the AC / DC / AC back-to-back converters 106 also monitor the voltage conditions on both sides of substation 4 in real time. If a voltage anomaly is detected, the converters quickly analyze and adjust the voltage through reactive power compensation. When the terminal voltage is low, the converters inject reactive power into the system to improve the power factor and thereby increase the terminal voltage. When the voltage is too high, the converters absorb reactive power from the system and reduce the voltage. This stabilizes the terminal voltage, ensures that the catenary supply voltage remains within a reasonable range, and provides a good electrical environment for the safe and stable operation of the locomotive.

[0076] In this embodiment, the third access feed system 102 can collect power and voltage data from both sides of the substation 4 in real time and accurately upload it, while also efficiently receiving commands from the control center, providing information and instructions for energy scheduling and voltage regulation. The second three-phase transformer 104, with its neutral-point grounded safety design, achieves voltage level adaptation while ensuring electrical isolation and reducing the risk of system failure. Multiple AC / DC / AC back-to-back converters 106, serving as core execution components, flexibly regulate bidirectional energy flow based on the control center's dispatching instructions, rationally allocating excess energy generated by locomotive regenerative braking to demand areas, significantly improving energy utilization and reducing waste. Regarding voltage stability, it intelligently adjusts terminal voltage through real-time monitoring and dynamic reactive power compensation, effectively preventing the adverse effects of excessively high or low voltage on locomotive operation and ensuring stable catenary supply voltage. These three components work together to comprehensively improve the operational efficiency, energy utilization, and power supply stability of the railway flexible traction power supply system.

[0077] In an exemplary embodiment, Figure 3a As shown, a branch line between the first end of the third access feeder system 102 and the neutral point of the first side coil of the second three-phase transformer 104 is connected in series with single-pole disconnectors (1QS11 and 1QS12), single-pole circuit breakers (1DL1 and 1DL2), and current transformers (11LH and 21LH), and an incoming line lightning arrester (1BL and 2BL) is connected in parallel with the first end of the third access feeder system 102.

[0078] In this embodiment, the single-pole disconnectors (1QS11 and 1QS12) can safely isolate the corresponding branch circuits during equipment maintenance, troubleshooting, or system debugging, providing a safe working environment for maintenance personnel. They also facilitate flexible switching of system operating modes, ensuring convenient maintenance and operational flexibility of the power supply system. The single-pole circuit breakers (1DL1 and 1DL2) can precisely control the on / off of the circuit under normal operating conditions and quickly disconnect the circuit in the event of abnormal faults such as overload or short circuit. This effectively prevents the spread of the fault, protects subsequent equipment and lines from damage, and significantly enhances the system's fault response capability and safety. The current transformers (11LH and 21LH) can accurately collect current signals in the circuit, providing real-time, accurate current data to the energy dispatch management and control center and other monitoring equipment, assisting the system in energy dispatch calculations and operating status analysis. The incoming line lightning arresters (1BL and 2BL) are connected in parallel to the first terminal of the third access feeder system 102 to effectively suppress lightning overvoltage and switching overvoltage, preventing irreversible damage to system equipment caused by transient high voltages such as lightning, thereby enhancing the system's anti-interference capability and operational reliability. These devices work together to fully ensure the stable, safe and efficient operation of the railway flexible traction power supply system, significantly reducing maintenance costs and operational interruption risks caused by equipment failure.

[0079] In an exemplary embodiment, Figure 3b As shown, the AC-DC-AC back-to-back converter 106 is composed of a plurality of power switch tubes. Those skilled in the art can understand the connection relationship of each power switch tube from the figure, which will not be described in detail here.

[0080] In an exemplary embodiment, Figure 4 As shown, the present application also provides a control method for a railway flexible traction power supply system, which is applied to the railway flexible traction power supply system in the above embodiment, and the method includes:

[0081] S402, obtaining electrical quantity data of the substation, electrical quantity data of the substation, and the location and number of the substations;

[0082] S404: Control the first flexible power supply device and the second flexible power supply device to achieve energy scheduling between the substations according to the electrical quantity data of the substations, the electrical quantity data of the substations, and the location and number of the substations.

[0083] The control method of the above-mentioned railway flexible traction power supply system, its specific implementation process and its beneficial effects can be referred to the description in the above-mentioned railway flexible traction power supply system embodiment, and will not be repeated here.

[0084] In an exemplary embodiment, Figure 5 As shown, the electrical quantity data of the substation includes the historical power curve of the substation and the historical regenerative braking energy data of the substation. Based on the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations, the first flexible power supply device and the second flexible power supply device are controlled to realize energy scheduling between the substations, including:

[0085] S502, selecting some substations from a plurality of substations as target substations based on historical power curves of the substations, historical regenerative braking energy data of the substations, and the locations and number of the substations;

[0086] S504, using the power supply area of the target substation and the substations adjacent to the target substation as the group energy dispatching area;

[0087] S506, determining the energy dispatching working condition according to the number of substations in the group energy dispatching area, the communication status between the substations, and the data collection status of the substations;

[0088] S508, generating an energy dispatch instruction according to the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area;

[0089] S510: Send an energy scheduling instruction to the first flexible power supply device and the second flexible power supply device to achieve energy scheduling between substations.

[0090] The substation's historical power curve refers to the curve data showing the power changes over time during the substation's past operation, recording the substation's power level and changing trends over different time periods. By analyzing the historical power curve, we can understand the fluctuation patterns of the substation's power, the timing and intensity of load peaks and troughs, and other information. This provides an important basis for selecting target substations and helps determine which substations have greater potential and necessity for energy scheduling. The substation's historical regenerative braking energy data refers to the historical data recording the energy generated by locomotive regenerative braking within the substation's jurisdiction, including information such as the amount of regenerative braking energy generated and the time period of generation. This data can be used to evaluate the substation's regenerative braking energy generation and select substations with a high proportion of regenerative braking energy as target substations to better utilize regenerative braking energy and achieve energy savings and cost reductions. The location and number of substations refer to their geographical distribution and the total number of substations in the system. The location determines the proximity and spatial distribution of substations. Combined with the number, the scope of the group energy dispatch area can be rationally planned, ensuring the feasibility and efficiency of energy dispatch and enabling the proper transmission and allocation of energy between adjacent substations. A group energy dispatch area defines the power supply area of a target substation and its adjacent substations as a single energy dispatch area. This clarifies the specific area for energy dispatch, allowing it to be carried out within a relatively concentrated area. This facilitates unified management and regulation of energy within the area, improves the efficiency and effectiveness of energy dispatch, and achieves optimal energy allocation within the area. The number of substations within a group energy dispatch area refers to the number of substations included in the group energy dispatch area; this number influences the determination of energy dispatch operating conditions. Different numbers of substations lead to varying degrees of complexity in communication and data collection, which in turn influences energy dispatch strategies and methods, making it a key factor in determining energy dispatch operating conditions. The communication status between substations refers to the working conditions of the communication links between substations in the group energy dispatch area, such as whether the communication is normal and whether the signal is stable. The communication status directly affects the transmission of data and the issuance of instructions. If the communication is normal, data sharing and collaborative control between substations can be achieved. If the communication is interrupted, an autonomous operation mode may be required. It is a key factor in determining the energy dispatch working conditions and affects the implementation method and control strategy of energy dispatch. The data collection status of each substation refers to whether the collection of information such as electrical quantity data by each substation is normal and whether the data is accurate and reliable. The data collection status determines whether valid operating data can be obtained. If the data collection is normal, it can provide an accurate basis for the generation of energy dispatch instructions. If the data collection is invalid, it will affect the accuracy and reliability of energy dispatch and is an important basis for determining the energy dispatch working conditions.The energy dispatching condition refers to the energy dispatching working mode determined by factors such as the number of substations within the group energy dispatching area, the communication status, and the data collection status. Different energy dispatching conditions correspond to different processing procedures and energy dispatching strategies, which guide the generation of subsequent energy dispatching instructions, ensuring that energy dispatching work can proceed smoothly according to actual conditions and achieve reasonable energy allocation. The current operating status of each substation within the group energy dispatching area refers to the current operating status of each substation within the group energy dispatching area, such as whether it is in traction or regenerative braking state, load size, power factor, and other real-time status of electrical quantity data. The determination of the current operating status provides real-time operating information for the generation of energy dispatching instructions. Based on the current operating status of each substation, the energy supply and demand situation can be accurately judged, thereby generating reasonable energy dispatching instructions and achieving optimal energy dispatch among substations. The energy dispatching instruction refers to the control command generated by the energy management control center and issued to the first flexible power supply device and the second flexible power supply device, which is used to guide the flexible power supply devices to perform energy dispatching operations; the energy dispatching instruction is the specific execution instruction for realizing energy dispatch between substations. The first flexible power supply device and the second flexible power supply device perform corresponding operations according to the energy dispatching instruction, such as adjusting the transmission direction and size of energy, so as to realize the full utilization of regenerative braking energy and energy integration between substations.

[0091] For example, target substations are selected based on their historical power curves, historical regenerative braking energy data, and location information. For example, if a substation's historical power curve shows significant load fluctuations, and its historical regenerative braking energy data indicates that regenerative braking energy accounts for more than 20% of the traction load, and the probability of traction / regeneration complementarity with adjacent substations is greater than 30%, then the substation may be selected as the target substation. The power supply areas of the target substation and its adjacent substations are defined as a group energy dispatch area. Assuming that target substation A is adjacent to substations B and C, the power supply areas of substations A, B, and C constitute the group energy dispatch area, allowing for unified energy management and control within a relatively concentrated area. The energy dispatch operating conditions are determined based on the number of substations within the group energy dispatch area, their communication status, and their data collection status. If the three substations in the area are communicating normally with the control center and data collection is correct, the system is in working mode 1. At this time, the system will calculate energy dispatch instructions according to the traction / regeneration status of the three substations in 8 situations. For example, if the group energy dispatch area includes three substations (such as substations A, B, and C), and each substation communicates normally with the control center and data collection is valid, the system will make combined judgments based on the traction / regeneration status of the three substations ("traction" means energy consumption, and "regeneration" means energy generation), forming a total of 8 situations, as shown below:

[0092] Case 1: A regeneration, B regeneration, C regeneration: All three generate regenerative braking energy, and it is necessary to determine whether to store it through the energy storage device or feed it back to the external grid;

[0093] Case 2: A pulls, B regenerates, and C regenerates: A requires energy, B and C generate energy, and the regenerated energy of B and C is dispatched to A;

[0094] Case 3: A pulls, B pulls, and C regenerates: A and B require energy, C generates energy, and C's energy is dispatched to A and B first;

[0095] Case 4: A traction, B traction, C traction: All three require energy, triggering the energy storage device to release energy or draw power from the external grid;

[0096] Case 5: A regenerates, B pulls, and C regenerates: A and C generate energy, B requires energy, and the energy of A and C is dispatched to B;

[0097] Case 6: A regenerates, B traction, and C traction: A generates energy, B and C require energy, and A's energy is dispatched to B and C;

[0098] Case 7: A regenerates, B regenerates, and C traction: A and B generate energy, C requires energy, and the energy of A and B is dispatched to C;

[0099] Case 8: A pulls, B regenerates, and C pulls: A and C require energy, B generates energy, and B's energy is dispatched to A and C.

[0100] In each of the above cases, the direction and size of energy dispatch must be calculated to ensure that the renewable energy is used first by the adjacent substations, reducing the demand for external power supply from the grid.

[0101] If the two stations are communicating and collecting data normally, and are in working mode 2, there are four calculation instructions, as shown in the following examples:

[0102] Case 1: A regeneration, B regeneration: Both generate energy, which is preferentially stored in the energy storage device or balanced between the two;

[0103] Case 2: A pulls, B regenerates: A requires energy, B generates energy, and B's regenerative energy is directly dispatched to A;

[0104] Case 3: A traction and B traction: Both require energy, triggering the release of stored energy or external grid power supply;

[0105] Case 4: A regenerates and B pulls: A generates energy, B needs energy, and A's energy is dispatched to B.

[0106] At this time, scheduling instructions are generated based on the energy supply and demand relationship between the two institutes to ensure efficient transmission of regenerated energy between the two institutes and avoid energy waste.

[0107] If any station's communication is interrupted or data collection is invalid, it will be in working mode 3. At this time, the flexible power supply device B of the substation will autonomously calculate the dispatch value based on the power information on both sides and perform energy dispatch between the two substations.

[0108] Then, energy dispatch instructions are generated based on the energy dispatch operating conditions and the current operating status of each substation. For example, in operating mode 1, if substation A within the cluster is in a regenerative braking state and generates excess energy, while substation B is in a traction state and requires a large amount of energy, the system generates an instruction for the flexible power supply device to transfer A's excess energy to B via the substation. The energy dispatch instruction is then sent to the first and second flexible power supply devices for execution. The first flexible power supply device uses an AC-DC-AC converter to integrate energy between the transformer's two ports, converting regenerative braking energy or photovoltaic energy through a DC-DC converter for storage or transmission. The second flexible power supply device receives instructions via an AC-DC-AC back-to-back converter, controlling the bidirectional flow of energy between the two substations while simultaneously performing reactive power compensation to stabilize the terminal voltage. This enables energy dispatch between the substations and fully utilizes regenerative braking energy. For example, energy generated by a locomotive braking downhill can be allocated to the locomotive traction uphill, reducing energy waste.

[0109] In this embodiment, based on the historical power curve, regenerative braking energy data and location number of the substation, the target substation is scientifically screened and the group energy dispatching area is delineated, making the energy dispatching more targeted and efficient; different energy dispatching conditions are determined according to the number of substations in the group, communication and data acquisition status, and the dispatching instructions are accurately calculated according to the situation to ensure that the energy dispatching strategy is in line with the actual operating conditions; by generating and issuing energy dispatching instructions to the first and second flexible power supply devices, the regenerative braking energy is integrated and optimally allocated among the substations, such as allocating the energy generated by the downhill locomotive braking to the uphill traction locomotive, greatly improving the utilization rate of the regenerative braking energy, saving energy and reducing costs; at the same time, the method can also trigger the energy storage device to release energy during peak load to achieve peak shaving and valley filling, reduce maximum demand, save basic electricity charges, introduce photovoltaic energy to achieve multi-source power supply, reduce carbon emissions, and perform reactive power compensation and harmonic control through the flexible power supply device to improve the power quality and ensure power supply stability.

[0110] In an exemplary embodiment, the electrical quantity data of the substation includes a current power curve of the substation and current regenerative braking energy data of the substation. Before the step of generating the energy dispatch instruction based on the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area, the step further includes:

[0111] The current operating state of each substation in the group energy dispatching area is determined according to the current power curve of the substation and the current regenerative braking energy data of the substation; the current operating state includes the traction state and the regenerative braking state.

[0112] In this embodiment, the current power curve and regenerative braking energy data obtained in real time can accurately reflect the current energy supply and demand situation of each substation, so that the system can dynamically grasp the energy distribution status in the group energy scheduling area, thereby more accurately judging the energy flow and demand, ensuring that the generated energy scheduling instructions are in line with the real-time operating conditions, and improving the timeliness and accuracy of energy scheduling; this method of determining the operating status based on real-time data allows the system to quickly respond to changes in the energy status of each substation. For example, when a substation suddenly switches from a traction state to a regenerative braking state, the system can adjust the scheduling strategy in time and quickly allocate the regenerated energy to the demand area to avoid energy waste and further improve the utilization rate of regenerative braking energy; at the same time, accurate determination of the current operating status also provides a guarantee for the efficient operation of the flexible power supply device, so that the first flexible power supply device and the second flexible power supply device can more accurately perform energy transmission, storage and reactive power compensation operations according to real-time instructions, thereby enhancing the dynamic adaptability and operational stability of the entire traction power supply system.

[0113] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0114] Based on the same inventive concept, an embodiment of the present application further provides a control device for a railway flexible traction power supply system for implementing the control method for the railway flexible traction power supply system involved above. The implementation solution provided by this device is similar to the implementation solution described in the above method. Therefore, the specific limitations in one or more embodiments of the control device for a railway flexible traction power supply system provided below can be found in the above-mentioned limitations on the control method for a railway flexible traction power supply system, and will not be repeated here.

[0115] In an exemplary embodiment, Figure 6 As shown, a control device for a railway flexible traction power supply system is provided, including: a data acquisition module 602 and a scheduling module 604, wherein:

[0116] The data acquisition module 602 is used to acquire the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations.

[0117] The scheduling module 604 is used to control the first flexible power supply device and the second flexible power supply device to achieve energy scheduling between each substation based on the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations.

[0118] In an exemplary embodiment, the scheduling module 604 includes:

[0119] The selection unit is used to select some substations from multiple substations as target substations according to the historical power curves of the substations, the historical regenerative braking energy data of the substations, and the locations and numbers of the substations.

[0120] The dispatching area determination unit is used to use the power supply areas of the target substation and the substations adjacent to the target substation as the group energy dispatching area.

[0121] The dispatching working condition determination unit is used to determine the energy dispatching working condition according to the number of substations in the group energy dispatching area, the communication status between the substations and the data collection status of the substations.

[0122] The dispatch instruction generation unit is used to generate energy dispatch instructions according to the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area.

[0123] The instruction issuing unit is used to issue energy scheduling instructions to the first flexible power supply device and the second flexible power supply device to realize energy scheduling between substations.

[0124] In an exemplary embodiment, the scheduling module 604 further includes:

[0125] The operating status determination unit is used to determine the current operating status of each substation in the group energy dispatching area based on the current power curve of the substation and the current regenerative braking energy data of the substation; the current operating status includes the traction status and the regenerative braking status.

[0126] Each module in the control device of the railway flexible traction power supply system can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0127] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 7As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store electrical quantity data of substations, electrical quantity data of substations, and location and quantity data of substations. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through a network connection. When the computer program is executed by the processor, a control method for a railway flexible traction power supply system is implemented.

[0128] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0129] In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0130] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0131] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0132] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0133] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Although these terms are used interchangeably throughout this specification, they do not necessarily refer to the same embodiment or example.

[0134] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A railway flexible traction power supply system, characterized in that: The system includes: multiple substations, multiple substations, multiple autotransformer stations, multiple first flexible power supply devices, multiple second flexible power supply devices and an energy management control center; A plurality of substations are connected in parallel to the contact network, a substation is provided on the contact network between every two adjacent substations, and an autotransformer is provided on the contact network between every adjacent substation and substation; A plurality of the first flexible power supply devices are connected to the substations in a one-to-one correspondence via the contact network; A plurality of the second flexible power supply devices are connected to the sub-areas in a one-to-one correspondence via the contact network; The energy management control center is respectively connected to multiple first flexible power supply devices and multiple second flexible power supply devices. The energy management control center controls the first flexible power supply device and the second flexible power supply device to realize energy scheduling between the substations based on the electrical quantity data of the substation collected by the first flexible power supply device and the electrical quantity data of the substation collected by the second flexible power supply device, as well as the location and number of the substations.

2. The railway flexible traction power supply system according to claim 1, characterized in that: The first flexible power supply device is also used to connect to an energy storage device and / or a photovoltaic device.

3. The railway flexible traction power supply system according to claim 2, characterized in that: The first flexible power supply device includes: a first access feeder system, wherein a first end of the first access feeder system is connected to a first end of the substation through the contact network; a second access feeder system, wherein a first end of the second access feeder system is connected to a second end of the substation through the contact network; a first three-phase transformer, wherein a first side of the first three-phase transformer is connected to a second end of the first access feed system and a second end of the second access feed system respectively; Multiple three-phase converter devices, wherein the first ends of the multiple three-phase converter devices are connected in parallel to the second side of the first three-phase transformer, and the second ends of the multiple three-phase converter devices are used to connect to the energy storage device and / or the photovoltaic device.

4. The railway flexible traction power supply system according to claim 3, characterized in that: The first access feeder system and the second access feeder system have the same structure. A bipolar disconnector, a bipolar circuit breaker and a current transformer are connected in series between the first end and the second end of the first access feeder system, and an incoming line lightning arrester is connected in parallel to the first end of the first access feeder system.

5. The railway flexible traction power supply system according to claim 3, characterized in that: The three-phase converter device comprises: an AC-DC-AC three-bridge-arm converter, wherein a first end of the AC-DC-AC three-bridge-arm converter is connected to the second side of the first three-phase transformer; A DC carrier circuit, wherein a first end of the DC carrier circuit is connected to a second end of the AC-DC-AC three-arm converter, and a second end of the DC carrier circuit is used to access the energy storage device and / or the photovoltaic device.

6. The railway flexible traction power supply system according to claim 2, characterized in that: The second flexible power supply device includes: a third access feeder system, wherein a first end of the third access feeder system is connected to the sub-station via the contact network; a second three-phase transformer, wherein a first side of the second three-phase transformer is connected to the second end of the third access feed system, and a neutral point of the first side coil of the second three-phase transformer is grounded; A plurality of AC-DC-AC back-to-back converters are connected in parallel to the second side of the second three-phase transformer.

7. The railway flexible traction power supply system according to claim 6, characterized in that: A single-pole disconnector, a single-pole circuit breaker and a current transformer are connected in series in sequence on the branch between the first end of the third access feeder system and the neutral point of the first side coil of the second three-phase transformer, and an incoming line lightning arrester is connected in parallel to the first end of the third access feeder system.

8. A control method for a railway flexible traction power supply system, applied to the railway flexible traction power supply system according to any one of claims 1 to 7, characterized in that: The method comprises: Obtaining electrical quantity data of substations, electrical quantity data of substations, and the locations and numbers of the substations; According to the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substations, the first flexible power supply device and the second flexible power supply device are controlled to realize energy scheduling between the substations.

9. The control method of the railway flexible traction power supply system according to claim 8, characterized in that: The electrical quantity data of the substation includes a historical power curve of the substation and historical regenerative braking energy data of the substation. Controlling the first flexible power supply device and the second flexible power supply device to achieve energy scheduling between the substations based on the electrical quantity data of the substation, the electrical quantity data of the substations, and the location and number of the substations includes: selecting some substations from the plurality of substations as target substations according to the historical power curves of the substations, the historical regenerative braking energy data of the substations, and the locations and number of the substations; Taking the power supply areas of the target substation and the substations adjacent to the target substation as the group energy dispatching area; determining an energy dispatching operating condition according to the number of substations in the group energy dispatching area, the communication status between the substations, and the data collection status of the substations; generating an energy dispatch instruction according to the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area; An energy scheduling instruction is issued to the first flexible power supply device and the second flexible power supply device to realize energy scheduling between substations.

10. The control method of the railway flexible traction power supply system according to claim 9, characterized in that: The electrical quantity data of the substation includes a current power curve of the substation and current regenerative braking energy data of the substation. Before the step of generating an energy dispatch instruction based on the energy dispatch working condition and the current operating status of each substation in the group energy dispatch area, the step further includes: The current operating state of each substation in the group energy dispatching area is determined according to the current power curve of the substation and the current regenerative braking energy data of the substation; the current operating state includes a traction state and a regenerative braking state.

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