Traction power supply system control method and system, electronic device and readable storage medium

Abstract

This application discloses a traction power supply system control method, system, electronic device, and readable storage medium, relating to the field of rail transit. The method includes acquiring the current travel information of the train; determining a first power supply zone and a second power supply zone based on the current travel information; when the train meets the control conditions for entering the phase-splitting zone, a control switch switching device executes a first switching action, connecting the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase-splitting zone; adjusting the output voltage of the converter device based on the current travel information, so that the traction voltage on the traction line of the phase-splitting zone when the train enters the phase-splitting zone is the power supply voltage of the first power supply zone, and the traction voltage on the traction line of the phase-splitting zone when the train exits the phase-splitting zone is the power supply voltage of the second power supply zone. This application can ensure that the pantograph does not experience voltage and current surges when the train passes through the phase-splitting zone, smoothly entering the next power supply zone, and can select a converter device with a smaller configuration capacity to achieve flexible train transitions through phase-splitting zones.

Description

Technical Field

[0001] This application relates to the field of rail transit, and in particular to a traction power supply system control method, system, electronic equipment, and readable storage medium. Background Technology

[0002] Mainline electrified railways use a single-phase AC power system at industrial frequency. To reduce the impact of traction load on power system imbalance, mainline railways typically employ a phase sequence rotation and phase-zone power supply scheme. In this case, electrical phase separation is required at the phase separation points. To prevent phase-to-phase short circuits during phase commutation, adjacent power supply areas are separated at the phase separation points using insulating devices or insulating anchor joints, forming an electrical phase separation, called the neutral section. Passing through the phase separation point is the process of the train passing through the neutral section.

[0003] Currently, trains typically employ a flexible phase transition scheme. The basic principle of flexible phase transition is as follows: Power electronic converters are configured in the section to supply power to the neutral zone. Before the train enters the neutral zone, the output voltage of the power electronic converter is controlled to be equal in amplitude and phase to the voltage of the power supply arm the train is currently in. After the train enters the neutral zone, the amplitude and potential of the output voltage of the power electronic converter are repeatedly and slightly altered until it finally matches the voltage of the power supply arm the train is about to enter, thus allowing the train to smoothly enter the power supply zone in the direction of travel. Please refer to... Figure 1 , Figure 1 This is a schematic diagram of a flexible over-phase scheme. Figure 1 The power electronic converter absorbs energy from the a-phase power supply arm through transformer T1 on the left end, and then transmits the energy to the neutral zone through transformer T2 on the right end. At this time, the power electronic device has to bear all the power required for the train to run in the neutral zone, and the device has a large capacity.

[0004] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a traction power supply system control method, system, electronic equipment, and readable storage medium that can ensure that the pantograph will not experience voltage and current surges when the train passes through the phase-separation zone, and smoothly enter the next power supply zone. A converter device with a smaller configuration capacity can be selected to achieve flexible phase-separation of the train.

[0006] To address the aforementioned technical problems, this application provides a traction power supply system control method applied to a sectioning substation. The sectioning substation includes a switchgear and a converter. The switchgear is connected to the power supply zones on both sides of the sectioning substation, the converter, and the traction lines of the phase-separated areas within the sectioning substation. The traction power supply system control method includes:

[0007] The current travel information of the train is obtained, and a first power supply area and a second power supply area are determined based on the current travel information; wherein, the power supply area first passed along the travel direction of the train is the first power supply area, and the power supply area passed later is the second power supply area;

[0008] When the train meets the control conditions for entering the phase-splitting zone, the switch switching device is controlled to perform the first switch action, connecting the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase-splitting zone.

[0009] The output voltage of the converter device is adjusted based on the current driving information so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone.

[0010] Optionally, the traction power supply system control method further includes:

[0011] When the train meets the control conditions for leaving the phase separation zone, the switch switching device is controlled to perform a second switching action, cutting off the power supply voltage of the first power supply zone and the output voltage of the converter device from the traction line of the phase separation zone.

[0012] Optionally, the current driving information includes the train's current driving position and current driving direction;

[0013] The process of adjusting the output voltage of the converter device based on the current driving information, so that the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone when the train enters the phase-splitting zone, and the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone when the train leaves the phase-splitting zone, includes:

[0014] When the train's current position is in the first position interval before entering the phase-splitting zone or in the second position interval after entering the phase-splitting zone, the output voltage of the converter device is controlled to be 0; when the train's current position is in the third position interval after entering the phase-splitting zone, the output voltage of the converter device is increased according to the control cycle, so that when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone;

[0015] The train passes through the second position section and then the third position section along the current direction of travel.

[0016] Optionally, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0017] Determine the target voltage; the target voltage is the difference between the supply voltage of the first power supply area and the supply voltage of the second power supply area;

[0018] The output voltage of the converter device is increased according to the control cycle, so that the output voltage of the converter device increases to the target voltage in the target control cycle, wherein the target control cycle is the control cycle when the train leaves the phase separation zone.

[0019] Optionally, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0020] The adjustment coefficient for each control cycle is determined based on the target voltage and the current driving information. The adjustment coefficient for the i-th control cycle is less than the adjustment coefficient for the (i+1)-th control cycle, where i = 1, 2, ..., p-1, and the p-th control cycle is the target control cycle.

[0021] The output voltage of the converter device is adjusted according to the adjustment coefficient in each control cycle.

[0022] Optionally, the switch switching device includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to the power supply end of the first power supply area. The second end of the first switch is connected to the first end of the converter device and the first end of the second switch. The second end of the second switch is connected to the phase-splitting traction line. The first end of the third switch is connected to the power supply end of the second power supply area. The second end of the third switch is connected to the first end of the fourth switch and the second end of the converter device. The second end of the fourth switch is connected to the phase-splitting traction line.

[0023] The process of controlling the switch switching device to perform the first switch action includes:

[0024] The first and fourth switches in the switch switching device are turned on, while the second and third switches are turned off.

[0025] Optionally, the partition also includes a first transformer and a second transformer, with the first end of the first switch connected to the power supply terminal of the first power supply area through the first transformer, and the first end of the third switch connected to the power supply terminal of the second power supply area through the second transformer.

[0026] Optionally, the traction power supply system control method further includes:

[0027] Upon receiving an energy dispatch command, the switch switching device is controlled to perform a third switching action, enabling regenerative braking energy to be transmitted between the first power supply zone and the second power supply zone.

[0028] Optionally, the process of controlling the switch switching device to perform the third switch action includes:

[0029] The first and third switches in the switch switching device are turned on, while the second and fourth switches are turned off.

[0030] Optionally, the energy scheduling command is determined based on the train's current travel information.

[0031] Optionally, the process of controlling the switching device to perform a third switching action after receiving an energy dispatch command, so that regenerative braking energy is transferred between the first power supply area and the second power supply area, includes:

[0032] Upon receiving an energy dispatch command, the switch switching device is controlled to perform a third switching action, and the output current of the converter device is adjusted based on the energy dispatch command, so that the regenerative braking energy is transmitted between the first power supply area and the second power supply area in the transmission direction corresponding to the output current.

[0033] Optionally, the converter device includes a converter, a reactor, and an output transformer. One output terminal of the converter is connected to a first terminal of the primary side of the output transformer through the reactor, and the other output terminal of the converter is connected to a second terminal of the primary side of the output transformer. The first terminal of the secondary side of the output transformer serves as the first terminal of the converter device, and the second terminal of the secondary side of the output transformer serves as the second terminal of the converter device.

[0034] The process of adjusting the output current of the converter device based on the energy dispatch command includes:

[0035] The output voltage of the converter is adjusted based on the energy dispatch command, thereby adjusting the output current of the converter device.

[0036] To address the aforementioned technical problems, this application also provides a traction power supply system control system applied to a sectioning substation. The sectioning substation includes a switchgear and a converter. The switchgear is connected to the power supply zones on both sides of the sectioning substation, the converter, and the traction lines of the phase-separated areas within the sectioning substation. The traction power supply system control system includes:

[0037] The acquisition module is used to acquire the current driving information of the train and determine the first power supply area and the second power supply area based on the current driving information; wherein, the power supply area first passed along the driving direction of the train is the first power supply area, and the power supply area passed later is the second power supply area;

[0038] The control module is used to control the switch switching device to perform a first switching action when the train meets the control conditions for entering the phase separation zone, so as to connect the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase separation zone;

[0039] An adjustment module is used to adjust the output voltage of the converter device based on the current driving information, so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone.

[0040] To address the aforementioned technical problems, this application also provides an electronic device, comprising:

[0041] Memory, used to store computer programs;

[0042] A processor for executing the computer program to implement the steps of the traction power supply system control method as described in any of the above.

[0043] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the traction power supply system control method as described in any of the above claims.

[0044] This application provides a traction power supply system control method. When a train passes through a phase-splitting zone, the control switch switching device executes a first switching action, connecting the supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase-splitting zone. This allows the first power supply zone and the converter device to jointly supply power to the train. By adjusting the output voltage of the converter device, the traction voltage and the supply voltage of the first power supply zone are made the same when the train enters the phase-splitting zone, ensuring that the pantograph does not experience voltage and current surges when passing through the phase-splitting zone. By adjusting the output voltage of the converter device, the traction voltage and the supply voltage of the second power supply zone are made the same when the train leaves the phase-splitting zone, ensuring that the train smoothly enters the next power supply zone. The converter device does not need to bear all the power required by the train when running in the phase-splitting zone. Therefore, a smaller capacity converter device can be selected to achieve flexible train transitions through phase-splitting zones. This application also provides a traction power supply system control system, electronic equipment, and computer-readable storage medium, which have the same beneficial effects as the above-described traction power supply system control method. Attached Figure Description

[0045] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of an existing flexible over-phase scheme;

[0047] Figure 2 A schematic diagram of a flexible phase separation scheme for partitioning provided in this application;

[0048] Figure 3 A flowchart of the steps of a traction power supply system control method provided in this application;

[0049] Figure 4a A schematic diagram of voltage regulation of a converter device in a power supply section where a train is running from power supply section A to power supply section B, provided for the purposes of this application;

[0050] Figure 4b A schematic diagram of voltage regulation of a converter device in a power supply section where a train is running from power supply section B to power supply section A, provided for the purposes of this application;

[0051] Figure 5 A schematic diagram of another flexible phase separation scheme for partitioning provided in this application;

[0052] Figure 6 A power fusion diagram provided in this application;

[0053] Figure 7 This is a schematic diagram of the structure of a traction power supply system control system provided in this application. Detailed Implementation

[0054] The core of this application is to provide a traction power supply system control method, system, electronic equipment, and readable storage medium that can ensure that the pantograph will not experience voltage and current surges when the train passes through the phase-separation zone, and smoothly enter the next power supply zone. A converter device with a smaller configuration capacity can be selected to achieve flexible phase-separation of the train.

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Firstly, this application provides a traction power supply system control method. To facilitate understanding of the traction power supply system control method provided in this application, the sectioning substation to which the traction power supply system control method is applicable will be described below. This sectioning substation includes a switchgear and a converter device. The switchgear is connected to the power supply areas on both sides of the sectioning substation, the converter device, and the traction line of the phase-separated area within the sectioning substation. In this embodiment, the power supply area first passed along the train's direction of travel in the power supply areas on both sides of the sectioning substation is defined as the first power supply area, and the power supply area passed later is defined as the second power supply area. Specifically, refer to... Figure 2 As shown, the switching device includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The first end of the first switch S1 is connected to the power supply end of the first power supply zone. The second end of the first switch S1 is connected to the first end of the converter device and the first end of the second switch S2. The second end of the second switch S2 is connected to the phase-splitting traction line. The first end of the third switch S3 is connected to the power supply end of the second power supply zone. The second end of the third switch S3 is connected to the first end of the fourth switch S4 and the second end of the converter device. The second end of the fourth switch S4 is connected to the phase-splitting traction line. Specifically, the converter device includes a converter 21, a reactor L, and an output transformer T. One output end of the converter 21 is connected to the first end of the primary side of the output transformer T through the reactor L. The other output end of the converter 21 is connected to the second end of the primary side of the output transformer T. The first end of the secondary side of the output transformer T serves as the first end of the converter device, and the second end of the secondary side of the output transformer T serves as the second end of the converter device. This application constructs an H-bridge using four switches and a converter 21, flexibly changing the on and off states of the four switches, thereby altering the connection between the converter 21 and the traction grid in the phase-splitting area, as well as the power supply arms at both ends of the phase-splitting area, to achieve the traction grid's flexible phase-splitting and power sharing requirements.

[0057] This application does not specifically limit the converter and power supply; any device capable of regulating output voltage and current is acceptable. For example, it can be a back-to-back converter. The power input to the converter can be a three-phase grid, a single-phase grid, a new energy system (photovoltaic, wind power, hydrogen fuel cell), an energy storage system (batteries, flywheels, etc.), or a converter with four-quadrant functionality. Its DC link is only equipped with energy storage, capacitors, or reactors, etc. Closing S1 and S3 charges the energy storage element in the DC link from power supply section A or B, or charges the energy storage element in the DC link of the converter when the train passes through a phase split (S1 and S4 are closed, or S2 and S3 are closed). This application also does not restrict the implementation of switches S1 to S4; they can be mechanical switches, electronic switches, or hybrid switches.

[0058] Please refer to Figure 3 , Figure 3The present application provides a flowchart of the steps of a traction power supply system control method, which includes:

[0059] S101: Obtain the current travel information of the train, and determine the first power supply area and the second power supply area based on the current travel information;

[0060] The train's current travel information includes, but is not limited to, the train's current direction of travel, current position, current speed, and the voltage and power of the contact point between the pantograph and the overhead contact line. Based on the train's current direction of travel, the first and second power supply zones are determined in the power supply zones on both sides of the substation. Specifically, the power supply zone that the train passes through first along its direction of travel is determined as the first power supply zone, and the power supply zone that it passes through later is determined as the second power supply zone.

[0061] For example, refer to Figure 2 As shown, if a train runs from power supply section A to power supply section B, then power supply section A is the first power supply area and power supply section B is the second power supply area. If a train runs from power supply section B to power supply section A, then power supply section A is the second power supply area and power supply section B is the first power supply area.

[0062] S102: When the train meets the control conditions for entering the phase separation zone, the control switch switching device performs the first switch action to connect the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase separation zone.

[0063] The entry control conditions for the phase-splitting zone include that the train has not entered the phase-splitting zone, and the distance between the train and the phase-splitting zone is less than a preset distance. The control switch switching device executes the first switching action, connecting the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase-splitting zone. Figure 2 For example, assuming a train is traveling from power supply section A to power supply section B, power supply section A is the first power supply zone, and power supply section B is the second power supply zone. When the train is about to enter the phase-separation zone, the first and fourth switches are closed, and the second and third switches are opened. At this time, the power supply arm of power supply section A and the output of the converter are connected to the phase-separation zone traction line to supply power to the train. Similarly, assuming a train is traveling from power supply section B to power supply section A, power supply section B is the first power supply zone, and power supply section A is the second power supply zone. When the train is about to enter the phase-separation zone, the second and third switches are closed, and the first and fourth switches are opened. At this time, the power supply arm of power supply section B and the output of the converter are connected to the phase-separation zone traction line to supply power to the train.

[0064] S103: Adjust the output voltage of the converter device based on the current driving information so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone.

[0065] As an optional embodiment, the traction power supply system control method further includes:

[0066] When the train meets the control conditions for leaving the phase separation zone, the control switch switching device performs the second switch action to cut off the power supply voltage of the first power supply zone and the output voltage of the converter device from the phase separation zone traction line.

[0067] In this embodiment, the output voltage of the converter is adjusted according to the current position information in the current driving information. When the train's current driving position is in the first position interval before entering the phase-splitting zone or in the second position interval after entering the phase-splitting zone, the output voltage of the converter is controlled to be 0. At this time, the traction voltage of the zone is consistent with the voltage of the first power supply zone, thereby ensuring that the traction line voltage remains unchanged when the train enters the phase-splitting zone from the first power supply zone, and ensuring that the pantograph will not experience voltage and current surges when passing through the phase-splitting zone. When the train's current driving position is in the third position interval after entering the phase-splitting zone, the output voltage of the converter is gradually increased until the target voltage is reached, so that the traction voltage on the traction line of the phase-splitting zone is the power supply voltage of the second power supply zone when the train leaves the phase-splitting zone, ensuring that the train smoothly enters the second power supply zone from the phase-splitting zone. After the train enters the second power supply zone, the first switch and the fourth switch are disconnected, and the converter is turned off. The process of gradually increasing the output voltage of the converter includes increasing the output voltage of the converter according to the control cycle.

[0068] Based on the above embodiments:

[0069] As an optional embodiment, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0070] Determine the target voltage; the target voltage is the difference between the supply voltage of the first power supply area and the supply voltage of the second power supply area.

[0071] The output voltage of the converter is increased according to the control cycle, so that the output voltage of the converter increases to the target voltage in the target control cycle, which is the control cycle when the train leaves the phase separation zone.

[0072] Specifically, after the train enters the phase-splitting zone for a certain distance, the output voltage of the converter is gradually increased according to the control cycle. This increases the output voltage of the converter to the target voltage during the target control cycle when the train leaves the phase-splitting zone. The target voltage is the difference between the supply voltage of the first power supply zone and the supply voltage of the second power supply zone. At this time, the traction line voltage of the phase-splitting zone is equal to the supply voltage of the second power supply zone. Therefore, this ensures that the train smoothly enters the second power supply zone from the phase-splitting zone.

[0073] As an optional embodiment, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0074] The adjustment coefficient for each control cycle is determined based on the target voltage and current driving information, and the adjustment coefficient for the i-th control cycle is less than the adjustment coefficient for the (i+1)-th control cycle.

[0075] The output voltage of the converter is adjusted according to the adjustment factor in each control cycle.

[0076] Specifically, after the train has traveled a certain distance into the phase separation zone, it can refer to... Figure 4a and Figure 4b Two schemes are used to adjust the output voltage of the converter device in each control cycle, wherein, Figure 4a This is a schematic diagram illustrating voltage regulation as a train travels from power supply section A to power supply section B. Figure 4b This is a schematic diagram of voltage regulation for a train traveling from power supply section B to power supply section A. V T V is the output voltage of the converter. A V is the supply voltage for power supply section A. B This is the power supply voltage for power supply section B.

[0077] Reference Figure 5 As shown, the partition also includes a first transformer T1 and a second transformer T2. The first end of the first switch S1 is connected to the power supply end of the first power supply area through the first transformer T1, and the first end of the third switch S3 is connected to the power supply end of the second power supply area through the second transformer T2, so that the two power supply areas and the phase separation area are isolated by transformers.

[0078] by Figure 5 For example, when a train is traveling from power supply section A to power supply section B and is about to enter the phase-separation zone, switches S1 and S4 are closed in advance, while S2 and S3 are opened. At this time, the power supply arm and converter of power supply section A are connected to the traction line of the phase-separation zone to supply power to the train through the first transformer T1 and the output transformer T, respectively. Before and after the train enters the phase-separation zone, the output voltage of the control converter is kept at zero for a period of time. At this time, the traction voltage of the zone is consistent with the power supply voltage of power supply section A, thus ensuring that the traction line voltage remains unchanged when the train enters the phase-separation zone from power supply section A, and ensuring that there is no voltage or current surge when passing through the phase-separation zone; after the train enters the phase-separation zone, according to... Figure 4a The strategy involves gradually increasing the converter's output voltage, ensuring that before the train leaves the phase-splitting zone and enters power supply section B, the converter's output voltage is the difference between the voltage VA of power supply section A and the voltage VB of power supply section B. At this point, the traction line voltage in the phase-splitting zone is equal to the voltage of power supply section B, thus ensuring a smooth train transition from the phase-splitting zone into power supply section B. After the train enters power supply section B, switches S1 and S4 are disconnected, and the converter is shut down.

[0079] Similarly, when the train is traveling from power supply section B towards power supply section A and is about to enter the phase-separation zone, switches S2 and S3 are closed in advance, while S1 and S4 are opened. At this time, the power supply arm and converter of power supply section B are connected to the traction line of the phase-separation zone to supply power to the train through transformers T2 and T, respectively. Before and after the train enters the phase-separation zone, the output voltage of the control converter is kept at zero for a period of time. At this time, the traction voltage of the zone is consistent with the power supply voltage of power supply section B, thus ensuring that the traction line voltage remains unchanged when the train enters the phase-separation zone from power supply section B, and ensuring that there is no voltage or current surge when passing through the phase-separation zone; after the train enters the phase-separation zone, according to... Figure 4b The strategy involves gradually increasing the converter output voltage, requiring that before the train leaves the phase-splitting zone and enters power supply section A, the converter output voltage be the difference between the voltage VB of power supply section B and the voltage VA of power supply section A. At this time, the traction line voltage in the phase-splitting zone is equal to the voltage of power supply section A, thus ensuring that the train smoothly enters power supply section A from the phase-splitting zone. After the train enters power supply section A, switches S2 and S3 are disconnected, and the converter is shut down.

[0080] This application controls the on / off state of four switches based on train travel information and controls the output voltage of the converter based on the voltage of the power supply arms at both ends of the sectioning station, thereby achieving a smooth transition of the train at the sectioning station and realizing flexible phase transition of the train with a small configuration capacity.

[0081] As an optional embodiment, the traction power supply system control method further includes:

[0082] Upon receiving an energy dispatch command, the control switch switching device executes the third switch action to transfer regenerative braking energy between the first power supply zone and the second power supply zone.

[0083] As an optional embodiment, the process of controlling the switch switching device to perform the third switch action includes:

[0084] The first and third switches in the control switch switching device are turned on, while the second and fourth switches are turned off.

[0085] As an optional implementation, energy dispatch instructions are determined based on the train's current travel information.

[0086] As an optional embodiment, upon receiving an energy dispatch command, the control switch switching device executes a third switching action to transfer regenerative braking energy between the first and second power supply zones, including:

[0087] Upon receiving the energy dispatch command, the control switch switching device executes the third switch action and adjusts the output current of the converter device based on the energy dispatch command, so that the regenerative braking energy is transmitted between the first power supply area and the second power supply area in the transmission direction corresponding to the output current.

[0088] As an optional embodiment, the process of adjusting the output current of the converter device based on energy dispatch commands includes:

[0089] The output voltage of the converter is adjusted based on energy dispatch commands, thereby adjusting the output current of the converter device.

[0090] It is understandable that power sharing primarily enables the scheduling and utilization of regenerative braking energy in different power supply sections. When the rail transit traction power grid energy control system analyzes the distribution of regenerative braking energy in different power supply sections of the line, it formulates and sends the regenerative braking energy scheduling command (i.e., the output current of the converter in the section) to the section substation. After receiving the command from the upper-level energy control system, the converter in the section substation first controls the closing of bidirectional switches S1 and S3, and then controls the magnitude and direction of the converter output current, thereby realizing the scheduling of regenerative braking energy in different power supply sections. After closing bidirectional switches S1 and S3, the secondary voltage V of the converter output voltage transformer T... T The voltage difference V between power supply areas A and B AB By adjusting the converter's output voltage Vo, the voltage applied to the converter's output reactor is adjusted, thereby regulating the converter's output current. For example... Figure 6 As shown, when the converter's output voltage Vo is controlled at point P1, the output current is I; when the converter's output voltage Vo is controlled at point P2, the output current is I'. I and I' are on the same circular trajectory, so they are equal in magnitude but different in direction, thus achieving control over the power transmission direction between the two power supply sections; when the converter's output voltage Vo is controlled at point P3, the output current is I'", where the magnitude and direction of the power in both power supply sections can be controlled simultaneously.

[0091] Based on the power supplied by the power supply arms at both ends of the substation and the train operation conditions, this application determines the energy that needs to be exchanged between different power supply arms, controls the conduction and cutoff of four switching transistors, controls the output current of the converter, realizes energy flow between different power supply arms, improves the utilization of train regenerative braking energy, and balances the power supply power of different power supply sections.

[0092] In summary, the technical solution of this application can realize the flexible phase transition of trains and the power fusion function of different power supply sections of the traction power supply network with a single system, thereby improving the energy utilization efficiency, power supply safety and reliability, and system economy of the traction power grid.

[0093] Secondly, please refer to Figure 7 , Figure 7 This application provides a schematic diagram of the structure of a traction power supply system control system, applied to a sectioning substation. The sectioning substation includes a switchgear and a converter unit. The switchgear is connected to the power supply areas on both sides of the sectioning substation, the converter unit, and the traction line of the phase separation area in the sectioning substation. The traction power supply system control system includes:

[0094] The acquisition module 71 is used to acquire the current driving information of the train and determine the first power supply area and the second power supply area based on the current driving information; wherein, the power supply area first passed along the driving direction of the train is the first power supply area, and the power supply area passed later is the second power supply area;

[0095] Control module 72 is used to control the switch switching device to perform the first switch action when the train meets the control conditions for entering the phase separation zone, so as to connect the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase separation zone.

[0096] The adjustment module 73 is used to adjust the output voltage of the converter device based on the current driving information, so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone.

[0097] As an optional embodiment, the control module 72 is also used for:

[0098] When the train meets the control conditions for leaving the phase separation zone, the control switch switching device performs the second switch action to cut off the power supply voltage of the first power supply zone and the output voltage of the converter device from the phase separation zone traction line.

[0099] As an optional embodiment, the current driving information includes the train's current driving position and current driving direction;

[0100] The process of adjusting the output voltage of the converter based on the current driving information, so that the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone when the train enters the phase-splitting zone, and the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone when the train leaves the phase-splitting zone, includes:

[0101] When the train's current position is in the first position interval before entering the phase-splitting zone or in the second position interval after entering the phase-splitting zone, the output voltage of the control converter is 0; when the train's current position is in the third position interval after entering the phase-splitting zone, the output voltage of the converter is increased according to the control cycle so that the traction voltage on the phase-splitting zone traction line is the power supply voltage of the second power supply zone when the train leaves the phase-splitting zone.

[0102] The train will pass through the second position section and then the third position section along the current direction of travel.

[0103] As an optional embodiment, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0104] Determine the target voltage; the target voltage is the difference between the supply voltage of the first power supply area and the supply voltage of the second power supply area.

[0105] The output voltage of the converter is increased according to the control cycle, so that the output voltage of the converter increases to the target voltage in the target control cycle, which is the control cycle when the train leaves the phase separation zone.

[0106] As an optional embodiment, the process of increasing the output voltage of the converter device according to the control cycle includes:

[0107] The adjustment coefficient for each control cycle is determined based on the target voltage and current driving information, and the adjustment coefficient for the i-th control cycle is less than the adjustment coefficient for the (i+1)-th control cycle.

[0108] The output voltage of the converter is adjusted according to the adjustment factor in each control cycle.

[0109] As an optional embodiment, the switchgear includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to the power supply end of the first power supply zone. The second end of the first switch is connected to the first end of the converter device and the first end of the second switch. The second end of the second switch is connected to the phase-splitting traction line. The first end of the third switch is connected to the power supply end of the second power supply zone. The second end of the third switch is connected to the first end of the fourth switch and the second end of the converter device. The second end of the fourth switch is connected to the phase-splitting traction line.

[0110] The process of the control switch switching device executing the first switch action includes:

[0111] The first and fourth switches in the control switch switching device are turned on, while the second and third switches are turned off.

[0112] As an optional embodiment, the substation also includes a first transformer and a second transformer, with the first terminal of the first switch connected to the power supply terminal of the first power supply zone via the first transformer, and the first terminal of the third switch connected to the power supply terminal of the second power supply zone via the second transformer.

[0113] As an optional embodiment, the control module 72 is also used for:

[0114] Upon receiving an energy dispatch command, the control switch switching device executes the third switch action to transfer regenerative braking energy between the first power supply zone and the second power supply zone.

[0115] As an optional embodiment, the process of controlling the switch switching device to perform the third switch action includes:

[0116] The first and third switches in the control switch switching device are turned on, while the second and fourth switches are turned off.

[0117] As an optional implementation, energy dispatch instructions are determined based on the train's current travel information.

[0118] As an optional embodiment, upon receiving an energy dispatch command, the control switch switching device executes a third switching action to transfer regenerative braking energy between the first and second power supply zones, including:

[0119] Upon receiving the energy dispatch command, the control switch switching device executes the third switch action and adjusts the output current of the converter device based on the energy dispatch command, so that the regenerative braking energy is transmitted between the first power supply area and the second power supply area in the transmission direction corresponding to the output current.

[0120] As an optional embodiment, the converter device includes a converter, a reactor, and an output transformer. One output terminal of the converter is connected to the first terminal of the primary side of the output transformer through the reactor, and the other output terminal of the converter is connected to the second terminal of the primary side of the output transformer. The first terminal of the secondary side of the output transformer serves as the first terminal of the converter device, and the second terminal of the secondary side of the output transformer serves as the second terminal of the converter device.

[0121] The process of adjusting the output current of a converter device based on energy dispatch commands includes:

[0122] The output voltage of the converter is adjusted based on energy dispatch commands, thereby adjusting the output current of the converter device.

[0123] Thirdly, this application also provides an electronic device, including:

[0124] Memory, used to store computer programs;

[0125] A processor is used to execute a computer program to implement the steps of the traction power supply system control method as described in any of the embodiments above.

[0126] For a description of the electronic device provided in this application, please refer to the above embodiments; further details will not be repeated here.

[0127] The electronic device provided in this application has the same beneficial effects as the aforementioned traction power supply system control method.

[0128] Fourthly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the traction power supply system control method as described in any of the embodiments above.

[0129] For a description of the computer-readable storage medium provided in this application, please refer to the above embodiments; further details will not be repeated here.

[0130] The computer-readable storage medium provided in this application has the same beneficial effects as the above-described traction power supply system control method.

[0131] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0132] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A traction power supply system control method characterized by, This system is applied to a power distribution station, which includes a switchgear and a converter. The switchgear is connected to the power supply zones on both sides of the power distribution station, the converter, and the phase-separation zone traction line within the power distribution station. The switchgear includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to the power supply end of the first power supply zone. The second end of the first switch is connected to the first end of the converter and the first end of the second switch. The second end of the second switch is connected to the phase-separation zone traction line. The first end of the third switch is connected to the power supply end of the second power supply zone. The third switch... The second terminal of the switch is connected to the first terminal of the fourth switch and the second terminal of the converter device, respectively. The second terminal of the fourth switch is connected to the phase-separated traction line. The converter device includes a converter, a reactor, and an output transformer. One output terminal of the converter is connected to the first terminal of the primary side of the output transformer through the reactor. The other output terminal of the converter is connected to the second terminal of the primary side of the output transformer. The first terminal of the secondary side of the output transformer serves as the first terminal of the converter device, and the second terminal of the secondary side of the output transformer serves as the second terminal of the converter device. The traction power supply system control method includes: Obtain the current travel information of the train, and determine the first power supply area and the second power supply area based on the current travel information; wherein, the power supply area first passed along the travel direction of the train is the first power supply area, and the power supply area passed later is the second power supply area; When the train meets the control conditions for entering the phase-splitting zone, the switch switching device is controlled to perform the first switch action, connecting the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase-splitting zone. The output voltage of the converter device is adjusted based on the current driving information so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone. The current driving information includes the train's current position and current direction of travel; The process of adjusting the output voltage of the converter device based on the current driving information, so that the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone when the train enters the phase-splitting zone, and the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone when the train leaves the phase-splitting zone, includes: When the train's current position is in the first position interval before entering the phase-splitting zone or in the second position interval after entering the phase-splitting zone, the output voltage of the converter device is controlled to be 0; when the train's current position is in the third position interval after entering the phase-splitting zone, the output voltage of the converter device is increased according to the control cycle, so that when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone; Along the current direction of travel, the train first passes through the second position interval and then passes through the third position interval; The process of controlling the switch switching device to perform the first switch action includes: The first switch and the fourth switch in the switch switching device are turned on, and the second switch and the third switch are turned off; The traction power supply system control method further includes: Upon receiving an energy dispatch command, the first and third switches in the switching device are turned on, while the second and fourth switches are turned off, allowing regenerative braking energy to be transmitted between the first power supply area and the second power supply area.

2. The traction power supply system control method according to claim 1, characterized by, The traction power supply system control method further includes: When the train meets the control conditions for leaving the phase separation zone, the switch switching device is controlled to perform a second switching action, cutting off the power supply voltage of the first power supply zone and the output voltage of the converter device from the traction line of the phase separation zone.

3. The traction power supply system control method according to claim 1, characterized by, The process of increasing the output voltage of the converter device according to the control cycle includes: Determine the target voltage; the target voltage is the difference between the supply voltage of the first power supply area and the supply voltage of the second power supply area; The output voltage of the converter device is increased according to the control cycle, so that the output voltage of the converter device increases to the target voltage in the target control cycle, wherein the target control cycle is the control cycle when the train leaves the phase separation zone.

4. The traction power supply system control method according to claim 3, characterized by, The process of increasing the output voltage of the converter device according to the control cycle includes: The adjustment coefficient for each control cycle is determined based on the target voltage and the current driving information, wherein the adjustment coefficient for the i-th control cycle is less than that for the i-th control cycle. Adjustment coefficient for control cycle, The p-th control period is the target control period; The output voltage of the converter device is adjusted according to the adjustment coefficient in each control cycle.

5. The traction power supply system control method according to claim 1, characterized in that, The partition also includes a first transformer and a second transformer. The first end of the first switch is connected to the power supply end of the first power supply area through the first transformer, and the first end of the third switch is connected to the power supply end of the second power supply area through the second transformer.

6. The traction power supply system control method according to claim 1, characterized in that, The energy dispatching command is determined based on the train's current travel information.

7. The traction power supply system control method according to claim 1, characterized in that, The process of controlling the switching device to perform a third switching action after receiving an energy dispatch command, so as to transfer regenerative braking energy between the first power supply area and the second power supply area, includes: Upon receiving an energy dispatch command, the switch switching device is controlled to perform a third switching action, and the output current of the converter device is adjusted based on the energy dispatch command, so that the regenerative braking energy is transmitted between the first power supply area and the second power supply area in the transmission direction corresponding to the output current.

8. The traction power supply system control method according to claim 7, characterized in that, The process of adjusting the output current of the converter device based on the energy dispatch command includes: The output voltage of the converter is adjusted based on the energy dispatch command, thereby adjusting the output current of the converter device.

9. A traction power supply system control system, characterized in that, This system is applied to a power distribution station, which includes a switchgear and a converter. The switchgear is connected to the power supply zones on both sides of the power distribution station, the converter, and the phase-separation zone traction line within the power distribution station. The switchgear includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to the power supply end of the first power supply zone. The second end of the first switch is connected to the first end of the converter and the first end of the second switch. The second end of the second switch is connected to the phase-separation zone traction line. The first end of the third switch is connected to the power supply end of the second power supply zone. The third switch... The second terminal of the switch is connected to the first terminal of the fourth switch and the second terminal of the converter device, respectively. The second terminal of the fourth switch is connected to the phase-separated traction line. The converter device includes a converter, a reactor, and an output transformer. One output terminal of the converter is connected to the first terminal of the primary side of the output transformer through the reactor. The other output terminal of the converter is connected to the second terminal of the primary side of the output transformer. The first terminal of the secondary side of the output transformer serves as the first terminal of the converter device, and the second terminal of the secondary side of the output transformer serves as the second terminal of the converter device. The traction power supply system control system includes: The acquisition module is used to acquire the current driving information of the train and determine the first power supply area and the second power supply area based on the current driving information; wherein, the power supply area first passed along the driving direction of the train is the first power supply area, and the power supply area passed later is the second power supply area; The control module is used to control the switch switching device to perform a first switching action when the train meets the control conditions for entering the phase separation zone, so as to connect the power supply voltage of the first power supply zone and the output voltage of the converter device to the traction line of the phase separation zone; An adjustment module is used to adjust the output voltage of the converter device based on the current driving information, so that when the train enters the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone, and when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone. The current driving information includes the train's current position and current direction of travel; The process of adjusting the output voltage of the converter device based on the current driving information, so that the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the first power supply zone when the train enters the phase-splitting zone, and the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone when the train leaves the phase-splitting zone, includes: When the train's current position is in the first position interval before entering the phase-splitting zone or in the second position interval after entering the phase-splitting zone, the output voltage of the converter device is controlled to be 0; when the train's current position is in the third position interval after entering the phase-splitting zone, the output voltage of the converter device is increased according to the control cycle, so that when the train leaves the phase-splitting zone, the traction voltage on the traction line of the phase-splitting zone is the supply voltage of the second power supply zone; Along the current direction of travel, the train first passes through the second position interval and then passes through the third position interval; The process of controlling the switch switching device to perform the first switch action includes: The first switch and the fourth switch in the switch switching device are turned on, and the second switch and the third switch are turned off; The traction power supply system control system is also used for: Upon receiving an energy dispatch command, the first and third switches in the switching device are turned on, while the second and fourth switches are turned off, allowing regenerative braking energy to be transmitted between the first power supply area and the second power supply area.

10. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the traction power supply system control method as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the traction power supply system control method as described in any one of claims 1-8.

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