Railway flexible traction power supply system and control method thereof

Abstract

The application relates to a railway flexible traction power supply system and a control method thereof. The system comprises multiple substations, partition substations, self-coupled transformer substations, first and second flexible power supply devices and an energy management control center. The substation is connected in parallel with a contact network, the partition substations are arranged between adjacent substations, the self-coupled transformer substations are arranged between adjacent substations and the partition substations, the first and second flexible power supply devices are connected with the substations and the partition substations respectively, and the energy management control center controls the flexible power supply devices to realize energy scheduling between the substations based on collected electrical quantity data and the positions and quantities of the substations. The system can improve the utilization rate of locomotive regenerative braking energy.

Description

TECHNICAL FIELD

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

[0002] In the operation of electrified heavy haul railway, there is a significant transport characteristic, i.e. heavy load uplink and light load downlink, and the heavy load direction tends to be downhill, and the light load direction needs to climb, which causes the locomotive to be in braking condition for a long time during operation, thereby generating a large amount of regenerative braking energy, which is difficult to fully utilize.

[0003] Meanwhile, the existing traction power supply system adopts a segmented power supply mode, which makes it impossible to realize energy integration between the two-phase busbars of the traction substation and between multiple traction substations, greatly limiting the system's ability to absorb regenerative braking energy, resulting in not only energy waste but also increased electricity costs, which needs to be improved and innovated. SUMMARY

[0004] Therefore, it is necessary to provide a railway flexible traction power supply system and a control method thereof in view of the above technical problems.

[0005] In a first aspect, the present application provides a railway flexible traction power supply system, which comprises: multiple substations, multiple partition substations, multiple autotransformer substations, multiple first flexible power supply devices, multiple second flexible power supply devices and an energy management control center.

[0006] The multiple substations are connected in parallel to the catenary, and a partition substation is arranged on the catenary between every two adjacent substations, and an autotransformer substation is arranged on the catenary between every adjacent substation and partition substation.

[0007] The multiple first flexible power supply devices are connected one-to-one with the substations through the catenary.

[0008] The multiple second flexible power supply devices are connected one-to-one with the partition substations through the catenary.

[0009] The energy management control center is connected with the multiple first flexible power supply devices and the multiple second flexible power supply devices, respectively, and controls the first flexible power supply devices and the second flexible power supply devices to realize energy scheduling between the substations based on electrical quantity data of the substations collected by the first flexible power supply devices, electrical quantity data of the partition substations collected by the second flexible power supply devices, and the positions and quantities of the substations.

[0010] In one of the embodiments, the first flexible power supply device is further configured to connect an energy storage device and / or a photovoltaic device.

[0011] In one of the embodiments, the first flexible power supply device comprises:

[0012] a first access feeder system, a first end of the first access feeder system being connected to a first end of the substation through the catenary;

[0013] a second access feeder system, a first end of the second access feeder system being connected to a second end of the substation through the catenary;

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

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

[0016] In one of the embodiments, 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 a line in lightning protector is connected in parallel to the first end of the first access feeder system.

[0017] In one of the embodiments, the three-phase converter device comprises:

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

[0019] a DC carrier circuit, a first end of the DC carrier circuit being connected to a second end of the AC-DC-AC three-bridge converter, and a second end of the DC carrier circuit being configured to connect to the energy storage device and / or the photovoltaic device.

[0020] In one of the embodiments, the second flexible power supply device comprises:

[0021] a third access feeder system, a first end of the third access feeder system being connected to the substation through the catenary;

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

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

[0024] In one of the embodiments, a single-pole disconnector, a single-pole circuit breaker and a current transformer are connected in series 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 a line in lightning protector is connected in parallel to the first end of the third access feeder system.

[0025] In a second aspect, the application further provides a control method of a railway flexible traction power supply system, which is applied to the railway flexible traction power supply system in the above embodiments, and the method comprises the following steps:

[0026] obtaining electrical quantity data of the substation, electrical quantity data of the partition substation, and positions and quantities of the substations;

[0027] controlling the first flexible power supply device and the second flexible power supply device to realize energy scheduling between the substations according to the electrical quantity data of the substations, the electrical quantity data of the partition substations, and the positions and quantities of the substations.

[0028] In one of the embodiments, the electrical quantity data of the substations comprises historical power curves of the substations and historical regenerative braking energy data of the substations, and the step of controlling the first flexible power supply device and the second flexible power supply device to realize energy scheduling between the substations according to the electrical quantity data of the substations, the electrical quantity data of the partition substations, and the positions and quantities of the substations comprises the following steps:

[0029] selecting part of the substations as target substations from the plurality of substations according to the historical power curves of the substations, the historical regenerative braking energy data of the substations, and the positions and quantities of the substations;

[0030] regarding the power supply areas of the target substations and the substations adjacent to the target substations as group energy scheduling areas;

[0031] determining an energy scheduling working condition according to the quantities of the substations in the group energy scheduling areas, communication states between the substations, and data collection states of the substations;

[0032] generating an energy scheduling instruction according to the energy scheduling working condition and current operating states of the substations in the group energy scheduling areas;

[0033] issuing the energy scheduling instruction to the first flexible power supply device and the second flexible power supply device to realize energy scheduling between the substations.

[0034] In one of the embodiments, the electrical quantity data of the substations comprises current power curves of the substations and current regenerative braking energy data of the substations, and before the step of generating the energy scheduling instruction according to the energy scheduling working condition and the current operating states of the substations in the group energy scheduling areas, the method further comprises the following step:

[0035] determining the current operating states of the substations in the group energy scheduling areas according to the current power curves of the substations and the current regenerative braking energy data of the substations; the current operating states comprise traction states and regenerative braking states.

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

[0037] The data collected by each device is continuously monitored by the energy management control center, the scheduling strategy is dynamically adjusted, real-time scheduling and optimal distribution of the regenerative braking energy are realized, the waste of regenerative braking energy in a single area or the consumption of the regenerative braking energy due to the inability to utilize are avoided, the energy can be recycled between multiple substations, the utilization rate of the locomotive regenerative braking energy is fully improved, and the purposes of energy saving and optimizing the operation of the power supply system are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1 A structural schematic diagram of a railway flexible traction power supply system in an embodiment;

[0040] Figure 2 A structural schematic diagram of a first flexible power supply device in an embodiment;

[0041] Figure 2a A partial enlarged schematic diagram of a first access and feed system and a second access and feed system in an embodiment; Figure 2

[0042] A partial enlarged schematic diagram of a three-phase converter device in an embodiment; Figure 2b Figure 2 A structural schematic diagram of a second flexible power supply device in an embodiment;

[0043] Figure 3 A partial enlarged schematic diagram of a third access and feed system in an embodiment;

[0044] Figure 3a Figure 3 A partial enlarged schematic diagram of an AC-DC-AC back-to-back converter in an embodiment;

[0045] Figure 3b A flowchart of a control method of a railway flexible traction power supply system in an embodiment; Figure 3

[0046] A flowchart of a step of controlling a first flexible power supply device and a second flexible power supply device to realize energy scheduling between substations according to electrical quantity data of the substations, electrical quantity data of the partition substations, and positions and quantities of the substations in an embodiment; Figure 4

[0047] A flowchart of a step of controlling a first flexible power supply device and a second flexible power supply device to realize energy scheduling between substations according to electrical quantity data of the substations, electrical quantity data of the partition substations, and positions and quantities of the substations in an embodiment; Figure 5

[0048] ​​​Figure 6 a structure block diagram of a control device of a railway flexible traction power supply system in an embodiment;

[0049] Figure 7 an internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present application, a more full disclosure of the present application will be made with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application is more thorough and complete.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0052] It should be understood that the terms "first", "second", etc. used herein can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the 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 a central element. In addition, "connected" in the following embodiments should be understood as "electrically connected", "communicatively connected" and the like if there is transmission of electrical signals or data between the connected objects.

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

[0055] In an exemplary embodiment, as Figure 1As shown, this application provides a railway flexible traction power supply system, which includes multiple substations 2, multiple sectioning stations 4, multiple autotransformer stations 6, multiple first flexible power supply devices 8, multiple second flexible power supply devices 10, and an energy management control center 12. The multiple substations 2 are connected in parallel to the overhead contact line. A sectioning station 4 is installed on the contact line between every two adjacent substations 2, and an autotransformer station 6 is installed on the contact line between every adjacent substation 2 and sectioning station 4. Multiple first flexible power supply devices 8 are connected to substations 2 one-to-one via the contact line. Multiple second flexible power supply devices 10 are connected to sectioning stations 4 one-to-one via the contact line. The energy management control center 12 is connected to both the multiple first flexible power supply devices 8 and the multiple second flexible power supply devices 10. Based on the electrical quantity data of substations 2 collected by the first flexible power supply devices 8 and the electrical quantity data of sectioning stations 4 collected by the second flexible power supply devices 10, as well as the location and number of substations 2, the energy management control center 12 controls the first flexible power supply devices 8 and the second flexible power supply devices 10 to achieve energy scheduling between substations.

[0056] Among them, such as Figure 1 As shown, the overhead contact system refers to the network consisting of contact wires (such as...) Figure 1 The middle T line), return rail (as shown by the R line in the figure), and positive feed line (as shown by the ... R line in the figure). Figure 1 The power supply channel for electric locomotives is formed by the F-line (Central F-line). The specific connection relationships between each end (q, w, n, e, r) of substation 2 and the contact network, the specific connection relationships between each end (q, w, n, e, r) of section 4 and the contact network, the specific connection relationships between each end (a, b, c, d) of the first flexible power supply device 8 and the contact network, and the specific connection relationships between each end (a, n, b) of the second flexible power supply device 10 and the contact network are explained by those skilled in the art from... Figure 1The first flexible power supply device 8 is a device connected to the substation 2 through the catenary one by one, which can collect the electrical quantity data of the corresponding substation 2, such as voltage, current, power, etc., to provide the basis for the energy scheduling decision of the energy management control center 12, and receive the energy scheduling instruction of the energy management control center 12, so as to realize the regulation and control of the relevant energy of the substation 2 according to the control signal of the energy management control center 12, participate in the energy scheduling process between the substations 2, and fully utilize the locomotive regenerative braking energy. For example, when a locomotive generates regenerative braking energy in a certain substation 2 area, the first flexible power supply device 8 can adjust the configuration parameters of the substation 2 under the command of the control center, to assist the second flexible power supply device 10 to allocate the part of energy to other substations 2 areas that need energy. The second flexible power supply device 10 is a device connected to the partition station 4 through the catenary one by one, which is used to collect the electrical quantity data of the partition station 4, which can reflect the energy distribution of the catenary near the partition station 4, and provide support for the energy management control center 12 to master the energy state of the whole system. The second flexible power supply device 10 is also connected to the energy management control center 12 and accepts its control. Under the control of the energy management control center 12, it participates in the energy scheduling between the substations. The partition station 4 is arranged on the catenary between adjacent substations 2, and the second flexible power supply device 10 can adjust the energy flow of the catenary between adjacent substations 2 through the control of the partition station 4, and promote 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 realize the reasonable allocation of energy between the two substations 2, so that the energy generated by the locomotive regenerative braking can be effectively utilized, instead of being wasted or consumed.

[0057] Exemplarily, based on the one-to-one corresponding connection of the first flexible power supply device 8 and the substation 2, the one-to-one corresponding connection of the second flexible power supply device 10 and the partition substation 4, and the connection of the energy management control center 12 with the two types of flexible power supply devices, a complete energy scheduling and control system is constructed. Specifically, when the locomotive generates regenerative braking energy during operation, the energy will be fed back to the catenary. At this time, the first flexible power supply device 8 will collect the electrical quantity data of the corresponding substation 2 in real time, such as voltage, current, power, etc., and the second flexible power supply device 10 will collect the electrical quantity data of the partition substation 4. These data can reflect the energy distribution state and flow condition of the catenary in each region. Based on these real-time collected data, the energy management control center 12 analyzes and evaluates the energy state of the entire system in combination with the location and number of substations 2, etc. For example, when the locomotive regenerative braking energy in a certain substation 2 region is excessive, causing the voltage of the catenary in the region to rise or energy to accumulate, the energy management control center 12 will send control instructions to the corresponding first flexible power supply device 8 and second flexible power supply device 10 according to the energy demand condition of other substations 2. After receiving the instructions, the first flexible power supply device 8 will adjust the energy output of the substation 2 where it is located, and transmit the excessive regenerative braking energy to the substation 2 region with greater energy demand through the catenary. The second flexible power supply device 10 adjusts the energy flow path and flow between adjacent substations 2 by controlling the partition substation 4, to assist the transfer of regenerative braking energy between different substations 2. For example, by controlling the switching state or electrical parameters of the partition substation 4, the distribution of energy between adjacent substations 2 is optimized to ensure that the regenerative braking energy can be efficiently transferred from the excessive region to the demand region.

[0058] The above railway flexible traction power supply system can continuously monitor the data collected by each device by the energy management control center 12, dynamically adjust the scheduling strategy, realize real-time scheduling and optimized distribution of regenerative braking energy, avoid the waste of regenerative braking energy in a single region or the consumption of regenerative braking energy due to inability to utilize, and enable energy to be recycled between 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, as shown in Figure 1 The first flexible power supply device 8 is also used to connect an energy storage device and / or a photovoltaic device.

[0060] As shown in Figure 1 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] Exemplarily, in the case that the first flexible power supply device 8 is connected with the photovoltaic device, the photovoltaic power generation, a clean energy, can be introduced into the traction power supply system to realize multi-source access. The photovoltaic device converts solar energy into electric energy, and the first flexible power supply device 8 collects and regulates the output electric energy, integrates the photovoltaic electric energy into the catenary power supply network. At the same time, the output power, voltage and other electrical quantity data of the photovoltaic device are monitored in real time, and these data are transmitted to the energy management control center 12. According to the generation of the photovoltaic electric energy, the energy demand of each substation 2 and the running state of the whole system, the energy management control center 12 issues instructions to the first flexible power supply device 8 to reasonably allocate the photovoltaic electric energy, so that it is smoothly accessed to the system to supply power for the locomotive running, and the energy source of the traction power supply system is enriched. In terms of excess energy storage, when the energy generated by the locomotive regenerative braking is excessive or the output electric energy of the photovoltaic device exceeds the instantaneous demand of the system, the first flexible power supply device 8 will guide the excess regenerative braking energy and photovoltaic energy to the energy storage device for storage or transfer to the substation 2 in traction according to the instructions of the energy management control center 12. The first flexible power supply device 8 adjusts and converts the electric energy to make it meet the input requirements of the energy storage device, so as to realize efficient storage of energy. For example, when the locomotive runs less at night and the photovoltaic device also stops generating electricity, if enough energy is stored during the day, these energy can play a role in the subsequent. When the system load is too large, the energy management control center 12 will determine the load condition according to the real-time monitored electrical quantity data, and if it is found that the maximum demand threshold is reached or exceeded, an instruction will be sent to the first flexible power supply device 8. After receiving the instruction, the first flexible power supply device 8 controls the energy storage device to release the stored energy. The electric energy in the energy storage device is output with appropriate voltage, current and power under the regulation of the first flexible power supply device 8, and is supplemented to the catenary to supply power for the locomotive, thereby relieving the pressure of the power supply system. This way realizes peak load shifting, releases energy at the load peak, reduces the instantaneous high demand of the system on the external power grid, avoids the problem of unstable power supply caused by excessive load, effectively reduces the maximum demand, improves the stability and economy of the whole traction power supply system, and also improves the utilization efficiency of renewable energy.

[0062] In this embodiment, the first flexible power supply device 8 is connected with the energy storage device and / or the photovoltaic device, the photovoltaic device is introduced to realize multi-source access in the energy structure, the clean energy is integrated into the traction power supply system to reduce the dependence on traditional energy and reduce carbon emissions; in terms of energy management, the excess regenerative braking energy and photovoltaic electric energy are effectively handled, and are stored or transferred on demand through the energy storage device to avoid energy waste and improve energy utilization; in terms of system running stability, the energy storage device releases energy when the load is too large to realize peak load shifting, reduce the maximum demand, ensure stable power supply and reduce the impact of load fluctuation on the system.

[0063] In one exemplary embodiment, as shown in Figure 2 The first flexible power supply device 8 includes a first access feeder system 82, a second access feeder system 84, a first three-phase transformer 86, and a plurality of three-phase inverter devices 88. The first end of the first access feeder system 82 is connected to the first end of the substation 2 through the catenary; the first end of the second access feeder system 84 is connected to the second end of the substation 2 through the catenary; the first side of the first three-phase transformer 86 is connected to the second end of the first access feeder system 82 and the second end of the second access feeder system 84, respectively; the first end of the plurality of three-phase inverter devices 88 is connected in parallel to the second side of the first three-phase transformer 86, and the second end of the plurality of three-phase inverter devices 88 is used to connect energy storage devices and / or photovoltaic devices.

[0064] The first access feeder system 82 and the second access feeder system 84 can both be 55kV access feeder systems, and the first three-phase transformer 86 can be a V / V three-phase transformer. The first end (a end and b end in Figure 2 The first end (q end and w end in Figure 1 The first end (c end and d end in Figure 2 The first end (e end and r end in Figure 1 The first side of the first three-phase transformer 86 is connected to the second end of the first access feeder system 82 and the second end of the second access feeder system 84, respectively; the first end of the plurality of three-phase inverter devices 88 is connected in parallel to the second side of the first three-phase transformer 86, and the second end of the plurality of three-phase inverter devices 88 is used to connect energy storage devices and / or photovoltaic devices.

[0065] Exemplarily, 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 through the catenary respectively, and a stable energy transmission channel is constructed, when the photovoltaic device generates electric energy, the plurality of three-phase converter devices 88 convert the direct current output by the photovoltaic device into alternating current, and voltage conversion and electrical isolation are realized by means of the first three-phase transformer 86, and then the photovoltaic electric energy is coupled to the catenary power supply system, and the multi-source energy access to the traction power supply system is successfully realized. When the locomotive regenerative braking energy or the photovoltaic energy is excessive, the three-phase converter device 88 rectifies the excess electric energy into direct current, and stores it into the energy storage device through the first three-phase transformer 86 and the access feeder system. In this process, the three-phase converter device 88 can accurately adjust the electric energy parameters to adapt to the charging requirements of the energy storage device, so as to ensure efficient energy storage. When the system load is too large, the energy management control center 12 monitors that the demand exceeds the threshold value, and triggers the energy storage device to release energy. The three-phase converter device 88 converts the direct current stored in the energy storage device into alternating current, and the voltage is raised by the first three-phase transformer 86, and then distributed to the catenary through the first access feeder system 82 and the second access feeder system 84. According to the actual load of each substation 2, the distribution ratio of the two energy transmission paths can be dynamically adjusted to optimize the transmission path, realize accurate peak clipping 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 degree of the load in real time. When the power factor deviation is detected, the three-phase converter device 88 can work in the reactive power generation mode to dynamically inject or absorb reactive power, and improve the system power factor. For the harmonic problem, the converter device generates reverse compensation current through harmonic current detection and tracking control to offset the 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, so as to realize reactive power compensation, harmonic control and negative sequence compensation, and comprehensively improve the power quality to ensure that the entire traction power supply system can be efficiently utilized while maintaining stable and reliable operation.

[0066] In this embodiment, by connecting the first access feeder system 82 and the second access feeder system 84 to both ends of the substation 2, and cooperating with the first three-phase transformer 86, a stable and efficient energy transmission architecture is constructed to provide a solid foundation for multi-source energy access; the plurality of three-phase converter devices 88 realize AC / DC conversion of photovoltaic electric energy, rectification storage of excess regenerative braking energy and photovoltaic energy, and inversion release of energy storage device energy, effectively realizing multi-source energy access, storage and peak clipping and valley filling, reducing the maximum demand, and improving energy utilization efficiency; at the same time, based on the real-time monitoring of the load power factor, harmonic distortion rate and three-phase imbalance degree, the three-phase converter device 88 can specifically compensate for reactive power, control harmonics and compensate for negative sequence, and comprehensively improve the power quality to reduce equipment loss, prolong equipment service life, ensure stable and reliable operation of the traction power supply system, and reduce the risk of failure caused by power quality problems.

[0067] In one example embodiment, as shown in FIG. 1, the first access feeder system 82 and the second access feeder system 84 have the same structure, and a double-pole disconnector, a double-pole 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 a lightning arrester is connected in parallel to the first end of the first access feeder system 82. Figure 2a

[0068] In one example embodiment, as shown in FIG. 1, the first access feeder system 82 and the second access feeder system 84 have the same structure, and a double-pole disconnector, a double-pole 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 a lightning arrester is connected in parallel to the first end of the first access feeder system 82. Figure 2a

[0069] In this embodiment, the double-pole disconnectors (QS11, QS21) can safely disconnect the system from the external circuit in the case of equipment maintenance, fault isolation and the like, ensuring the safety of maintenance personnel and the convenience of system maintenance, and facilitating flexible switching of system operation modes; the double-pole circuit breakers (DL1, DL2) can control the on-off of the circuit during normal operation, rapidly cut off the circuit when the system has an overload, short circuit or the like, effectively protecting the safety of subsequent equipment and lines, and avoiding the expansion of the fault range; the current transformers (11LH, 21LH) can accurately collect current signals in the circuit, providing real-time and accurate current data for the energy management control center 12 and other monitoring equipment, facilitating the monitoring and regulation of the energy flow of the system; the lightning arresters (1BL, 2BL) are connected in parallel to the first end of the system, which can effectively suppress lightning overvoltage and operating overvoltage, prevent instantaneous high voltage such as lightning from damaging the equipment in the system, and enhance the anti-interference ability and operation reliability of the system, thereby ensuring the stable, safe and efficient operation of the entire railway flexible traction power supply system, and reducing the maintenance cost and operation interruption risk caused by equipment failure.

[0070] In one example embodiment, as shown in FIG. 1, the first access feeder system 82 and the second access feeder system 84 have the same structure, and a double-pole disconnector, a double-pole 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 a lightning arrester is connected in parallel to the first end of the first access feeder system 82. Figure 2b

[0071] ​​​Exemplarily, the AC-DC-AC three-bridge arm converter is connected to the second side of the first three-phase transformer 86, converts the alternating current output by the transformer into direct current, and inversely converts the direct current into alternating current according to actual needs to output, so as to realize the energy flow between the two ports of the transformer through bidirectional energy conversion. In the running process, the load conditions of the two ports are monitored in real time, the energy flow direction and size are flexibly adjusted, the loads of the two ports are balanced, the transformer capacity is fully utilized, and overloading of a port is avoided to reduce the port overload multiple. When excess energy is generated by the locomotive regenerative braking or excess electric energy is output by the photovoltaic device, the DC-DC direct current carrier circuit stores the electric energy after the electric energy is adapted and converted. When the system load is too large, the DC-DC direct current carrier circuit controls the energy storage device to release energy, which is converted and supplemented to the system to realize peak clipping and valley filling and reduce the maximum demand. In addition, the DC-DC direct current carrier circuit can process the direct current generated by the photovoltaic device to meet the requirements of access to the traction power supply system, so as to realize multi-source access, enrich the energy source of the system, and improve the overall performance of the system.

[0072] In this embodiment, based on the bidirectional energy conversion function of the AC-DC-AC three-bridge arm converter, the energy of the two ports of the transformer is effectively integrated, the load is dynamically balanced, the risk of port overloading is significantly reduced, the stable operation of the equipment is ensured, and the service life is prolonged; the DC-DC direct current carrier circuit builds a flexible energy storage and adjustment system, which can not only store excess regenerative braking energy of the locomotive and excess electric energy of the photovoltaic device efficiently, but also release the stored energy to reduce the maximum demand and save the electricity cost when the system load is at a peak. At the same time, the adaptation and processing of the photovoltaic electric energy realize multi-source energy access, enrich the energy structure of the system, and improve the utilization rate of renewable energy. The two work together to improve the reliability of the railway flexible traction power supply system in all directions.

[0073] In one exemplary embodiment, as shown in Figure 3 , the second flexible power supply device 10 includes a third access and feeder system 102, a second three-phase transformer 104, and a plurality of AC-DC-AC back-to-back converters 106. The first end of the third access and feeder system 102 is connected to the section post 4 through the catenary; the first side of the second three-phase transformer 104 is connected to the second end of the third access and feeder system 102, and the neutral point of the first side coil of the second three-phase transformer 104 is grounded; and the plurality of 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 and feeder system 102 (the a end and the b end shown in Figure 3 ) is connected to the section post 4 through the catenary; the first side of the second three-phase transformer 104 is connected to the second end of the third access and feeder system 102, and the neutral point (the N end shown in Figure 3 ) of the first side coil of the second three-phase transformer 104 is grounded.

[0075] Exemplarily, the third access and outgoing system 102 serves as a key bridge connecting the substation 4 and subsequent devices. Its first end is connected with the substation 4 through the catenary, and real-time collection of power information and voltage data on both sides of the substation 4 is performed, and the information is quickly transmitted to the energy scheduling and management control center. Meanwhile, the system can receive the commands issued by the control center, and provide basic conditions and instruction transmission channels for subsequent energy scheduling and voltage regulation operations. The first side of the second three-phase transformer 104 is connected with the second end of the third access and outgoing system 102, and the neutral point of the first side coil is grounded, which guarantees the electrical safety and stable operation of the system. It performs voltage transformation on the electric energy received from the third access and outgoing system 102, so that the voltage level of the electric energy is adapted to the working requirements of the subsequent AC-DC-AC back-to-back converter 106, and the isolation of the front and rear devices is realized in the electrical aspect, and the safety and reliability of the system are improved. A plurality of AC-DC-AC back-to-back converters 106 are connected in parallel to the second side of the second three-phase transformer 104, and become the core execution unit for realizing energy scheduling and voltage stabilization. When the energy scheduling and management control center calculates the energy scheduling value based on the power information on both sides of the substation 4, it will send instructions to the AC-DC-AC back-to-back converter 106. These converters can flexibly control the bidirectional flow of energy according to the instructions, and transmit the excess energy generated by regenerative braking from the transformer station 2 on the side with excess power to the transformer station 2 on the side with greater power demand through the substation 4, realizing efficient utilization of regenerative braking energy and avoiding energy waste. In terms of voltage stabilization, the AC-DC-AC back-to-back converter 106 can also monitor the voltage on both sides of the substation 4 in real time, and once an abnormal voltage is detected, the converter will quickly analyze and judge, and adjust through reactive power compensation. When the terminal voltage is low, the converter can inject reactive power into the system to improve the power factor and thus improve the terminal voltage; when the voltage is too high, the converter absorbs the reactive power in the system to reduce the voltage, so as to realize the stabilization of the terminal voltage and provide a good electrical environment for the safe and stable operation of the locomotive.

[0076] In this embodiment, the third access feeder system 102 can collect and accurately upload the power and voltage data on both sides of the partition S4 at the right time, and efficiently receive the commands from the control center, thereby providing information and instruction basis for energy scheduling and voltage regulation; the second three-phase transformer 104, with the safe design of neutral point grounding, can realize voltage level adaptation while ensuring electrical isolation and reducing system failure risk; the multiple AC-DC-AC back-to-back converters 106, as the core execution components, can flexibly regulate and control the bidirectional flow of energy according to the scheduling instructions from the control center, reasonably allocate the excess energy generated by the locomotive regenerative braking to the demand area, greatly improve the energy utilization rate, and reduce waste; in terms of voltage stability, the system can intelligently adjust the terminal voltage through real-time monitoring and dynamic reactive power compensation, effectively avoid the adverse effects of excessively high or low voltage on locomotive operation, and ensure the stability of the catenary power supply voltage. The three work together to comprehensively improve the operation efficiency, energy utilization level, and power supply stability of the railway flexible traction power supply system.

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

[0078] In this embodiment, the single-pole disconnector (1QS11 and 1QS12) can safely isolate the corresponding branch during equipment maintenance, fault troubleshooting, or system debugging, providing a safe working environment for maintenance personnel, and facilitating flexible switching of system operation modes to ensure the convenience of maintenance and the flexibility of operation of the power supply system; the single-pole circuit breaker (1DL1 and 1DL2) can accurately control the on-off of the circuit under normal operating conditions, quickly cut off the circuit in the event of abnormal faults such as overload or short circuit, effectively prevent the spread of faults, protect subsequent equipment and lines from damage, and significantly improve the fault response capability and safety of the system; the current transformer (11LH and 21LH) can accurately collect current signals in the circuit, providing real-time and accurate current data for the energy scheduling management control center and other monitoring equipment, and assisting the system in energy scheduling calculation and operation state analysis; the incoming line lightning protector (1BL and 2BL) connected in parallel with the first end of the third access feeder system 102 can effectively suppress lightning overvoltage and operating overvoltage, avoid irreversible damage to system equipment caused by lightning and other transient high voltage, and enhance the anti-interference ability and operation reliability of the system. These devices work together to comprehensively ensure the stable, safe, and efficient operation of the railway flexible traction power supply system, significantly reducing the maintenance cost and operational interruption risk caused by equipment failure.

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

[0080] In an exemplary embodiment, as shown in Figure 4 The present application also provides a control method of a railway flexible traction power supply system, which is applied to the railway flexible traction power supply system in the above-mentioned embodiments. The method comprises the following steps:

[0081] S402, acquiring electrical quantity data of the substation, electrical quantity data of the partition station, and the position and quantity of the substation;

[0082] S404, controlling the first flexible power supply device and the second flexible power supply device to realize energy scheduling between each substation according to the electrical quantity data of the substation, the electrical quantity data of the partition station, and the position and quantity of the substation.

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

[0084] In an exemplary embodiment, as shown in Figure 5 The electrical quantity data of the substation comprises historical power curve data 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 realize energy scheduling between each substation according to the electrical quantity data of the substation, the electrical quantity data of the partition station, and the position and quantity of the substation comprises the following steps:

[0085] S502, selecting part of the substations as target substations from the plurality of substations according to the historical power curve data of the substations, the historical regenerative braking energy data of the substations, and the position and quantity of the substations;

[0086] S504, taking the power supply area of the target substation and the substation adjacent to the target substation as a group energy scheduling area;

[0087] S506, determining an energy scheduling working condition according to the quantity of the substations in the group energy scheduling area, the communication state between each substation, and the data acquisition state of each substation;

[0088] S508, generating an energy scheduling instruction according to the energy scheduling working condition and the current running state of each substation in the group energy scheduling area;

[0089] S510, issuing the energy scheduling instruction to the first flexible power supply device and the second flexible power supply device to realize energy scheduling between each substation.

[0090] The historical power curve of the substation refers to the curve data of the power change of the substation over time in the past operation process, which records the power size and change trend of the substation in different time periods. By analyzing the historical power curve, the fluctuation law of the substation power, the time and intensity of the load peak and valley, and other information can be understood, which provides an important basis for selecting the target substation and helps to judge which substation has more potential and necessity for energy scheduling. The historical regenerative braking energy data of the substation refers to the historical data of the regenerative braking energy generated in the area under the jurisdiction of the substation, including the amount of regenerative braking energy generated, the time period, and other information. It can be used to evaluate the generation of regenerative braking energy of the substation, and to select the substation with a high proportion of regenerative braking energy as the target substation, so as to make full use of regenerative braking energy and achieve energy saving and cost reduction. The location and number of the substation refer to the geographical location distribution of the substation and the total number of the substation in the whole system. According to the location, the adjacent relationship and spatial distribution between the substations can be determined, and combined with the number, the range of the group energy scheduling area can be reasonably planned to ensure the feasibility and efficiency of energy scheduling, so that energy can be reasonably transmitted and allocated between adjacent substations. The group energy scheduling area refers to the power supply area of the target substation and the adjacent substations, which is defined as a whole energy scheduling range. It can clearly define the specific area of energy scheduling, so that energy scheduling can be carried out in a relatively concentrated range, which is convenient for unified management and control of energy in the area, improves the efficiency and effect of energy scheduling, and realizes the optimal allocation of energy in the area. The number of substations in the group energy scheduling area refers to the number of substations included in the group energy scheduling area. The number affects the determination of energy scheduling conditions. Different number of substations will lead to different complexity of communication state and data acquisition state, which in turn affects the strategy and mode of energy scheduling, and is one of the important factors for determining the energy scheduling conditions. The communication state between the substations refers to the working condition of the communication link between the substations in the group energy scheduling area, such as whether the communication is normal, whether the signal is stable, etc. The communication state directly affects the transmission of data and the issuance of instructions. If the communication is normal, data sharing and collaborative control between the substations can be realized; if the communication is interrupted, autonomous operation mode may be needed, which is a key factor for determining the energy scheduling conditions and affects the implementation mode and control strategy of energy scheduling. The data acquisition state of each substation refers to whether the acquisition of electrical quantity data and other information by each substation is normal, and whether the data is accurate and reliable. The data acquisition state determines whether valid operation data can be obtained. If the data acquisition is normal, it can provide accurate basis for the generation of energy scheduling instructions; if the data acquisition is invalid, it will affect the accuracy and reliability of energy scheduling, which is an important basis for determining the energy scheduling conditions.The energy scheduling working condition refers to an energy scheduling working mode determined according to the number of substations, communication state and data acquisition state in the group energy scheduling region. Different energy scheduling working conditions correspond to different processing programs and energy scheduling strategies, which guide the generation of subsequent energy scheduling instructions, and ensure that the energy scheduling work can be carried out smoothly according to the actual situation, and the energy is reasonably allocated. The current operating state of each substation in the group energy scheduling region refers to the real-time situation of the current working state of each substation in the group energy scheduling region, such as whether in traction state or regenerative braking state, load size, power factor and other electrical quantity data. The determination of the current working state provides real-time operating information for generating energy scheduling instructions. According to the current operating state of each substation, the supply and demand situation of energy can be accurately judged, so as to generate reasonable energy scheduling instructions and realize the optimal scheduling of energy among each substation. The energy scheduling instruction refers to a control command generated by the energy management control center and sent to the first flexible power supply device and the second flexible power supply device, which is used to guide the flexible power supply device to perform energy scheduling operation. The energy scheduling instruction is a specific execution instruction for realizing energy scheduling among each substation. The first flexible power supply device and the second flexible power supply device perform corresponding operations according to the energy scheduling instruction, such as adjusting the transmission direction and size of energy, so as to realize the full use of regenerative braking energy and the energy integration among each substation.

[0091] Exemplarily, the target substation is screened according to the historical power curve, historical regenerative braking energy data and position quantity information of the substation. For example, if the historical power curve of a substation shows that the load fluctuation is large, and the historical regenerative braking energy data shows that the regenerative braking energy accounts for more than 20% of the traction load, and the traction / regeneration complementary probability with the adjacent substations is greater than 30%, the substation may be selected as the target substation. The power supply area of the target substation and the adjacent substations is delimited as a group energy scheduling region. Assuming that the target substation A is adjacent to substations B and C, the power supply areas of the substations A, B and C constitute a group energy scheduling region, so that the energy can be uniformly managed and controlled in a relatively concentrated range. The energy scheduling working condition is determined according to the number of substations, communication state and data acquisition state in the group energy scheduling region. If the three substations in the region communicate normally with the control center and the data acquisition is correct, the working mode 1 is in this case. At this time, the system will calculate the energy scheduling instruction according to the traction / regeneration state of the three substations. For example, when the group energy scheduling region contains three substations (such as substations A, B and C), and each substation communicates normally with the control center and the data acquisition is effective, the system combines the traction / regeneration state of the three substations (“traction” means consuming energy, and “regeneration” means generating energy) to form eight cases, for example as follows:

[0092] Case 1: A regeneration, B regeneration, C regeneration: 3 substations produce regenerative braking energy, need to determine whether to store through energy storage device or feedback to external power grid;

[0093] Case 2: A traction, B regeneration, C regeneration: A needs energy, B and C produce energy, dispatch the regenerative energy of B and C to A;

[0094] Case 3: A traction, B traction, C regeneration: A and B need energy, C produces energy, preferentially dispatch the energy of C to A and B;

[0095] Case 4: A traction, B traction, C traction: 3 substations all need energy, trigger the energy release of energy storage device or take power from external power grid;

[0096] Case 5: A regeneration, B traction, C regeneration: A and C produce energy, B needs energy, dispatch the energy of A and C to B;

[0097] Case 6: A regeneration, B traction, C traction: A produces energy, B and C need energy, dispatch the energy of A to B and C;

[0098] Case 7: A regeneration, B regeneration, C traction: A and B produce energy, C needs energy, dispatch the energy of A and B to C;

[0099] Case 8: A traction, B regeneration, C traction: A and C need energy, B produces energy, dispatch the energy of B to A and C.

[0100] Each of the above cases needs to calculate the direction and size of energy dispatching to ensure that regenerative energy is preferentially utilized by adjacent substations and reduce the demand for external power grid power supply.

[0101] If the communication and data acquisition of 2 substations are normal, in working mode 2, the instructions are calculated in 4 cases, as follows:

[0102] Case 1: A regeneration, B regeneration: Both produce energy, preferentially store in energy storage device or balance between the two substations;

[0103] Case 2: A traction, B regeneration: A needs energy, B produces energy, directly dispatch the regenerative energy of B to A;

[0104] Case 3: A traction, B traction: Both need energy, trigger energy release or external power supply;

[0105] Case 4: A regeneration, B traction: A produces energy, B needs energy, dispatch the energy of A to B.

[0106] At this time, according to the energy supply and demand relationship of the two substations, dispatching instructions are generated to ensure efficient transmission of regenerative energy between the two substations and avoid energy waste.

[0107] If any of the communication is interrupted or the data collection is invalid, the substation is in working mode 3, at this time the flexible power supply device B of the substation autonomously calculates the scheduling value according to the power information on both sides, and performs energy scheduling between the two substations.

[0108] Then, according to the energy scheduling working condition and the current running state of each substation, an energy scheduling instruction is generated. For example, in working mode 1, if the substation A in the group is in the regenerative braking state to generate excess energy, and the substation B is in the traction state to require a large amount of energy, the system generates an instruction to make the flexible power supply device transmit the excess energy of A to B through the substation. The energy scheduling instruction is issued to the first and second flexible power supply devices for execution. The first flexible power supply device realizes transformer two-port energy fusion through an AC-DC-AC converter, and stores or transmits the regenerative braking energy or photovoltaic energy through a flow carrier circuit DC-DC conversion; the second flexible power supply device receives the instruction through an AC-DC-AC back-to-back converter, controls the energy to flow bidirectionally between the two substations, and at the same time performs reactive power compensation to stabilize the terminal voltage, so as to realize energy scheduling between the substations, and fully utilize the regenerative braking energy, such as allocating the energy generated by the locomotive in the downhill braking to the locomotive in the uphill traction to reduce energy waste.

[0109] In this embodiment, based on the historical power curve of the substation, the regenerative braking energy data and the position quantity and other information, the target substation is scientifically selected and the group energy scheduling area is delimited, so that the energy scheduling is more targeted and efficient; according to the number of substations in the group, the communication and data collection state, different energy scheduling working conditions are determined, the scheduling instruction is accurately calculated in different cases, and it is ensured that the energy scheduling strategy fits the actual running condition; by generating and issuing the energy scheduling instruction to the first and second flexible power supply devices, the regenerative braking energy is realized between the substations, and the optimization configuration is realized, such as allocating the energy generated by the locomotive in the downhill braking to the locomotive in the uphill traction, which greatly improves the utilization rate of the regenerative braking energy, saves energy and reduces cost; at the same time, the method can also trigger the energy storage device to release energy to realize peak load shifting and reduce the maximum demand, save basic electricity charges, introduce photovoltaic energy to realize multi-source power supply, reduce carbon emissions, and through the flexible power supply device, reactive power compensation, harmonic control and the like, the power quality is improved, and the power supply stability is ensured.

[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, and before the step of generating the energy scheduling instruction according to the energy scheduling working condition and the current running state of each substation in the group energy scheduling area, it further includes:

[0111] According to the current power curve of the substation and the current regenerative braking energy data of the substation, the current running state of each substation in the group energy scheduling area is determined; the current running state includes a traction state and a regenerative braking state.

[0112] In this embodiment, the current power curve and regenerative braking energy data obtained in real time can accurately reflect the energy supply and demand of each substation at the moment, so that the system can dynamically master the energy distribution state in the group energy scheduling area, thereby more accurately judging the energy flow direction and demand, and ensuring that the generated energy scheduling instruction fits the real-time operation condition, thereby improving the timeliness and accuracy of energy scheduling. The method of determining the running state based on real-time data can enable the system to quickly respond to changes in the energy state of each substation. For example, when a substation suddenly changes from traction state to regenerative braking state, the system can timely adjust the scheduling strategy to quickly allocate regenerative energy to the demand area, thereby avoiding energy waste and further improving the utilization rate of regenerative braking energy. At the same time, the accurate determination of the current running state 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 operation stability of the entire traction power supply system.

[0113] It should be understood that, although each step in the flowchart involved in each of the above embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, there is no strict order limitation for the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be alternately executed with at least part of other steps or steps or stages in other steps.

[0114] Based on the same inventive concept, the embodiments of the present application also provide a control device of a railway flexible traction power supply system for implementing the control method of the railway flexible traction power supply system as described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more control device embodiments of the railway flexible traction power supply system provided below can refer to the limitations of the control method of the railway flexible traction power supply system described above, which will not be repeated here.

[0115] In one exemplary embodiment, as shown in Figure 6 A control device of a railway flexible traction power supply system is provided, comprising: a data acquisition module 602 and a scheduling module 604, wherein:

[0116] The data acquisition module 602 is configured to acquire electrical quantity data of the substations, electrical quantity data of the partition substations, and positions and quantities of the substations.

[0117] The scheduling module 604 is configured to control the first flexible power supply device and the second flexible power supply device to realize energy scheduling between the substations according to the electrical quantity data of the substations, the electrical quantity data of the substation groups, and the positions and quantities of the substations.

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

[0119] The selection unit is configured to select part of the substations as target substations from the plurality of substations according to the historical power curve of the substations, the historical regenerative braking energy data of the substations, and the positions and quantities of the substations.

[0120] The scheduling region determination unit is configured to take the power supply region of the target substation and the substations adjacent to the target substation as a group energy scheduling region.

[0121] The scheduling condition determination unit is configured to determine an energy scheduling condition according to the quantity of the substations in the group energy scheduling region, the communication state between the substations, and the data acquisition state of the substations.

[0122] The scheduling instruction generation unit is configured to generate an energy scheduling instruction according to the energy scheduling condition and the current running state of the substations in the group energy scheduling region.

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

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

[0125] The running state determination unit is configured to determine the current running state of the substations in the group energy scheduling region according to the current power curve of the substations and the current regenerative braking energy data of the substations; the current running state comprises a traction state and a regenerative braking state.

[0126] The above-mentioned various modules in the control device of the railway flexible traction power supply system can be realized by software, hardware, and combinations thereof, in whole or in part. The above-mentioned various modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned various modules.

[0127] In an exemplary embodiment, a computer device is provided, which can be a server, and the internal structure diagram thereof can be as shown in Figure 7As shown in the figure. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through the system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capability. 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 the computer program in the non-volatile storage medium. The database of the computer device is used to store the electrical quantity data of the transformer substation, the electrical quantity data of the partition substation and the position and quantity data of the transformer substation. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with the terminal outside through the network connection. The computer program is executed by the processor to realize a control method of a railway flexible traction power supply system.

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

[0129] In one exemplary embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to realize the steps in each of the method embodiments described above.

[0130] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by the processor to realize the steps in each of the method embodiments described above.

[0131] In one embodiment, a computer program product is provided, including a computer program, and the computer program is executed by the processor to realize the steps in each of the method embodiments described above.

[0132] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., and is not limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., and is not limited thereto.

[0133] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", "ideal embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example.

[0134] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations are described above, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0135] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A railway flexible traction power supply system, characterized in that, The system includes: multiple substations, multiple zone stations, multiple autotransformer stations, multiple first flexible power supply devices, multiple second flexible power supply devices, and an energy management and control center; Multiple substations are connected in parallel to the contact network, and a section substation is provided on the contact network between every two adjacent substations. An autotransformer substation is provided on the contact network between every adjacent substation and section substation. Multiple first flexible power supply devices are connected to the substation one-to-one via the contact network; Multiple second flexible power supply devices are connected to the corresponding sections one by one through the contact network; The energy management control center is connected to multiple first flexible power supply devices and multiple second flexible power supply devices respectively. Based on the electrical quantity data of the substation collected by the first flexible power supply devices and the electrical quantity data of the substations collected by the second flexible power supply devices, as well as the location and number of the substations, the energy management control center controls the first flexible power supply devices and the second flexible power supply devices to realize energy scheduling between substations. The first flexible power supply device is also used to connect an energy storage device and / or a photovoltaic device. The first flexible power supply device includes: a first access feed system, a second access feed system, a first three-phase transformer, and multiple three-phase converter devices. The second flexible power supply device includes: a third access feed system, a neutral-grounded second three-phase transformer, and multiple AC-DC-AC back-to-back converters. The electrical quantity data of the substation includes the historical power curve 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 sections, 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: Based on the historical power curves of the substations, the historical regenerative braking energy data of the substations, and the location and number of the substations, a portion of the substations are selected as target substations from among the multiple substations; The target substation and the power supply area of ​​the substations adjacent to the target substation are designated as the group energy dispatch area. The energy dispatching conditions are determined based on the number of substations in the energy dispatching area, the communication status between the substations, and the data acquisition status of the substations. Based on the energy dispatch conditions and the current operating status of each substation within the energy dispatch area, an energy dispatch instruction is generated. Energy dispatch instructions are issued to the first flexible power supply device and the second flexible power supply device to realize energy dispatch among substations.

2. The railway flexible traction power supply system of claim 1, wherein, The first end of the first access feeder system is connected to the first end of the substation via the contact network; the first end of the second access feeder system is connected to the second end of the substation via the contact network; the first side of the first three-phase transformer is connected to the second end of the first access feeder system and the second end of the second access feeder system, respectively; the 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 the second ends of the plurality of three-phase converter devices are used to connect the energy storage device and / or the photovoltaic device.

3. The railway flexible traction power supply system of claim 2, wherein, The first access feeder system and the second access feeder system have the same structure. A double-pole disconnecting switch, a double-pole circuit breaker and a current transformer are connected in series between the first end and the second end of the first access feeder system. An incoming line surge protector is connected in parallel at the first end of the first access feeder system.

4. The railway flexible traction power supply system of claim 2, wherein, The three-phase converter device includes: An AC-DC-AC three-bridge-arm converter, wherein the 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 the first end of the DC carrier circuit is connected to the second end of the AC-DC-AC three-arm converter, and the second end of the DC carrier circuit is used to connect to the energy storage device and / or the photovoltaic device.

5. The railway flexible traction power supply system of claim 1, wherein, The first end of the third access feeder system is connected to the substation via the contact network; the first side of the second three-phase transformer is connected to the second end of the third access feeder system, and the 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.

6. The railway flexible traction power supply system according to claim 5, characterized in that, A single-pole disconnector, a single-pole circuit breaker, and a current transformer are connected in series on the branch between the first end of the third feedout system and the neutral point of the first coil of the second three-phase transformer, and an incoming surge protector is connected in parallel at the first end of the third feedout system.

7. A control method for a railway flexible traction power supply system, applied to the railway flexible traction power supply system as described in any one of claims 1-6, characterized in that, The method includes: Acquire electrical quantity data of substations, electrical quantity data of sub-districts, and the location and number of the substations; Based on the electrical quantity data of the substation, the electrical quantity data of the substation, and the location and number of the substation, the first flexible power supply device and the second flexible power supply device are controlled to realize energy scheduling between the substations. The electrical quantity data of the substation includes the historical power curve and historical regenerative braking energy data of the substation. The step of controlling the first flexible power supply device and the second flexible power supply device to achieve energy dispatching among the substations based on the electrical quantity data of the substations, the electrical quantity data of the substations, and the location and number of the substations includes: Based on the historical power curves of the substations, the historical regenerative braking energy data of the substations, and the location and number of the substations, a portion of the substations are selected as target substations from among the multiple substations; The target substation and the power supply area of ​​the substations adjacent to the target substation are designated as the group energy dispatch area. The energy dispatching conditions are determined based on the number of substations in the energy dispatching area, the communication status between the substations, and the data acquisition status of the substations. Based on the energy dispatch conditions and the current operating status of each substation within the energy dispatch area, an energy dispatch instruction is generated. Energy dispatch instructions are issued to the first flexible power supply device and the second flexible power supply device to realize energy dispatch among substations.

8. The control method for a railway flexible traction power supply system according to claim 7, characterized in that, The electrical quantity data of the substation includes the current power curve of the substation and the current regenerative braking energy data of the substation. Before the step of generating energy dispatch instructions based on the energy dispatch conditions and the current operating status of each substation within the group energy dispatch area, the method further includes: Based on the current power curve and current regenerative braking energy data of the substation, the current operating status of each substation within the group energy dispatch area is determined; the current operating status includes traction status and regenerative braking status.

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