A control method for an energy scheduling device and related equipment

Abstract

The present invention provides a control method and related equipment for an energy dispatching device. When the train's running position exceeds a preset distance from any partition, an energy dispatching device is randomly selected as the first control object and an inner optimization strategy is executed to obtain the corresponding dispatching instruction set and optimized total power for each energy dispatching device when it is the first control object; based on the dispatching instruction set corresponding to the minimum optimized total power, each energy dispatching device is controlled to perform energy dispatching; when the running position does not exceed a preset distance from any partition, the voltage difference at both ends of each energy dispatching device is controlled to be within a preset voltage range based on the traction grid power flow equation. In this solution, the power output of the energy dispatching device in each partition is optimized and adjusted according to the operating status of the same-phase through-type traction power supply system to achieve the full-line dispatching of the regenerative braking energy of trains in different power supply sections, smooth train segmentation, and reduce the negative sequence current of the 110kV power grid.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a control method for an energy dispatching device and related equipment. Background Art

[0002] The co-phase through-the-wire traction power supply system can reduce the negative sequence current in the 110kV three-phase grid caused by load imbalances between different power supply arms in traditional single-phase power supply systems. However, considering power supply reliability and cost, traction substations generally use traditional Scott transformers or V / V transformers to first step down the three-phase 110kV input voltage to two single-phase 27.5kV outputs. One of the two 27.5kV output terminals of the transformer is connected to the traction line, while the other output terminal is connected to the traction line via a co-phase power supply device. Therefore, it can be considered that the traction substation connects a power transformer and a co-phase power supply device in parallel to the 27.5kV traction grid to provide power to the trains. Due to the long traction lines, the 27.5kV traction network is electrically segmented between the two traction substations. This is achieved by using anchor joints to achieve electrical insulation and mechanical connection between the different supply sections. To ensure the utilization of train regenerative braking energy along the entire line, energy dispatching devices are connected in parallel at both ends of the electrical segmentation, creating a path for energy flow between the different supply sections.

[0003] Existing technology only dispatches a train's regenerative braking energy within the two power supply sections connected by the energy dispatch device. This system cannot simultaneously distribute regenerative braking energy to more than two traction substations, and fails to account for energy loss across different power supply sections. When a train passes through a staging area, the pantograph is simultaneously connected to both power supply sections. Large voltage differences across the staging area can generate large surge currents and arcs in the pantograph, jeopardizing the safety of power lines and related equipment. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a control method and related equipment for an energy dispatching device to achieve full-line dispatching of train regenerative braking energy in different power supply sections, smooth train segmentation, and reduce the negative sequence current of the 110kV power grid.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of an embodiment of the present invention discloses a control method for an energy dispatching device, which is applied to an energy management system. The energy management system is communicatively connected to the energy dispatching devices in each traction substation and each substation in a same-phase through-line traction power supply system. The control method includes:

[0007] Real-time monitoring of the target train's running position;

[0008] When the operating position is more than a preset distance away from any of the partitions, one of the energy dispatching devices is randomly selected each time as the first control object, and the inner optimization strategy is executed for the first control object. After all the energy dispatching devices execute the inner optimization strategy as the first control object, a dispatching instruction set corresponding to each of the energy dispatching devices as the first control object and the optimized total power required to be output by each of the traction substations when the dispatching instruction set is executed are obtained; the dispatching instruction set includes dispatching instructions corresponding to each of the energy dispatching devices;

[0009] Controlling each of the energy scheduling devices to perform energy scheduling based on the scheduling instruction set corresponding to the minimum optimized total power;

[0010] When the operating position is less than or equal to the preset distance from any of the partitions, each energy dispatching device is controlled based on a pre-established traction grid power flow equation so that the voltage difference across each of the energy dispatching devices is within a preset voltage range.

[0011] Preferably, executing the inner optimization strategy for the first control object includes:

[0012] The energy dispatching device corresponding to the first control object is used as the target energy dispatching device, the total power output by each traction substation on a first side of the target energy dispatching device is calculated to obtain a first power, and the total power output by each traction substation on a second side is calculated to obtain a second power; the second side is a side in the direction of travel of the target train, and the first side is a side opposite to the direction of travel of the target train;

[0013] Determining a scheduling instruction corresponding to the target energy scheduling device based on the first power and the second power; the scheduling instruction includes: a scheduling direction and a scheduling power;

[0014] Modifying the dispatch instruction based on a preset power flow solution model;

[0015] updating the first power based on the revised scheduling instruction, and adding the updated first power to the optimized total power;

[0016] Calculate the output power of the traction substation between the target energy dispatching device and the adjacent energy dispatching device, and use it as the first power. Take the target energy dispatching device and the adjacent energy dispatching device as the new target energy dispatching device, calculate the total power output by each traction substation on the other side of the target energy dispatching device, and use it as the second power. Return to the step of determining the dispatching instruction corresponding to the target energy dispatching device based on the first power and the second power until there is no adjacent energy dispatching device to the target energy dispatching device.

[0017] Preferably, determining the scheduling instruction corresponding to the target energy scheduling device based on the first power and the second power includes:

[0018] When the first power is greater than 0 and the second power is less than 0, determining that the scheduling direction is from the second side to the first side, and determining that the scheduling power is equal to the second power;

[0019] When the first power is less than 0 and the second power is greater than 0, determining that the scheduling direction is a direction from the first side to the second side, and determining that the scheduling power is equal to the first power;

[0020] Based on the scheduling direction and the scheduling power, a scheduling instruction corresponding to the target energy scheduling device is obtained.

[0021] Preferably, the modifying the dispatch instruction based on a preset power flow solution model includes:

[0022] Based on the power flow solution model and the scheduling instruction, a power flow calculation is performed to obtain a first optimized power and a second optimized power; the first optimized power and the second optimized power are respectively the powers corresponding to the first side and the second side of the target energy scheduling device when the scheduling instruction is executed;

[0023] respectively comparing the first power, the second power, the first optimized power, and the second optimized power with 0 to obtain comparison results;

[0024] If the comparison result meets the preset correction condition, an adjustment amount of the scheduling instruction is determined, and the scheduling instruction is corrected based on the adjustment amount, and the process returns to the step of performing a power flow calculation based on the power flow solution model and the scheduling instruction to obtain a first optimized power and a second optimized power;

[0025] If the comparison result meets the preset correction end condition, then when the number of flow calculations is equal to 1, the current adjustment instruction is determined to be the corrected adjustment instruction; when the number of flow calculations is greater than 1, the previous adjustment instruction is determined to be the corrected adjustment instruction.

[0026] Preferably, determining the adjustment amount of the scheduling instruction and modifying the scheduling instruction based on the adjustment amount includes:

[0027] determining an adjustment amount of the scheduling instruction according to a rated capacity of the target energy scheduling device corresponding to the scheduling instruction, a metaheuristic algorithm, or a machine learning method;

[0028] The scheduling direction and / or the scheduling power in the scheduling instruction is modified based on the adjustment amount.

[0029] Preferably, when the operating position is less than or equal to the preset distance from any of the subareas, controlling each energy dispatching device based on a pre-established traction grid power flow equation so that the voltage difference across each of the energy dispatching devices is within a preset voltage range includes:

[0030] Based on a pre-established traction grid power flow equation and the output voltage of each traction substation, solving the voltages at both ends of each substation to obtain a first terminal voltage and a second terminal voltage;

[0031] For the energy scheduling device in each of the partitions, determining a corresponding target output voltage based on the first terminal voltage and the second terminal voltage;

[0032] Solving the power at both ends of each energy dispatching device based on the traction grid power flow equation and each of the target output voltages to obtain a first end power and a second end power;

[0033] For each of the energy scheduling devices, adjusting the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generating a power output instruction based on the adjusted first-end power and second-end power;

[0034] The corresponding power output instruction is sent to each of the energy scheduling devices to control the power at both ends of each energy scheduling device so that the voltage difference at both ends of the energy scheduling device is within a preset voltage range.

[0035] Preferably, the energy scheduling device in each of the partitions determines the corresponding target output voltage based on the first terminal voltage and the second terminal voltage, including:

[0036] For the energy scheduling device in each of the partitions, determining an average value of the first terminal voltage and the second terminal voltage as a corresponding target output voltage;

[0037] or,

[0038] For the energy scheduling device in each of the partitions, the first terminal voltage or the second terminal voltage is determined as the corresponding target output voltage.

[0039] Preferably, adjusting the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generating a power output instruction based on the adjusted first-end power and second-end power, includes:

[0040] determining whether the sum of the power at the first end and the power at the second end exceeds the rated power of the energy scheduling device;

[0041] If yes, adjusting the power at the first end and the power at the second end so that the sum of the power at the first end and the power at the second end does not exceed the rated power;

[0042] Calculating a voltage difference between the two ends of the energy dispatching device based on the traction grid power flow equation, the current power at the first end, and the current power at the second end;

[0043] If the voltage difference is within a preset voltage range, generating a power output instruction based on the adjusted first-end power and the adjusted second-end power;

[0044] If the voltage difference is not within the preset voltage range, the current first-end power and the current second-end power are adjusted twice, and the step of solving the voltage difference between the two ends of the energy scheduling device based on the traction grid flow equation, the current first-end power and the current second-end power is returned to execute until the number of returns reaches the preset number, and a reminder signal is sent to the line signal system indicating that the voltage difference exceeds the preset voltage range.

[0045] Preferably, if the DC bus of the energy scheduling device is not configured with an energy storage unit, the method further includes:

[0046] If the sum of the first-end power and the second-end power does not exceed the rated power of the energy scheduling device, determining whether the sum of the active power in the first-end power and the second-end power is 0;

[0047] If yes, then the power at the first end and the power at the second end are not adjusted;

[0048] If not, the first-end power and the second-end power are adjusted so that the sum of the first-end power and the second-end power does not exceed the rated power, and the sum of the active power in the first-end power and the second-end power is 0.

[0049] Preferably, the traction substation is composed of a power transformer and a co-phase power supply device connected in parallel, and the method further comprises:

[0050] When the operating position is more than a preset distance away from any of the sub-stations, for each of the traction substations, if it is detected that the output power of the power transformer exceeds the output power of the same-phase power supply device and reaches a preset power range, the substation is determined to be the target traction substation;

[0051] Calculating the support power required by the target traction substation from adjacent traction substations;

[0052] adjusting the support power based on the output power of the target traction substation and the rated power of an associated energy dispatching device; the associated energy dispatching device is the energy dispatching device between the target traction substation and the adjacent traction substation;

[0053] The associated energy dispatching device is controlled to provide the adjusted support power to the target traction substation.

[0054] Preferably, the calculating of the support power required by the target traction substation from adjacent traction substations includes:

[0055] The difference between the rated power and the actual output power of the same-phase power supply device in the adjacent traction substation is calculated, and twice the difference is calculated to obtain the support power required by the target traction substation from the adjacent traction substation.

[0056] Preferably, adjusting the support power based on the output power of the target traction substation and the rated power of the associated energy dispatching device includes:

[0057] determining whether the output power of the target traction substation is less than the support power;

[0058] If so, adjusting the support power so that the support power is equal to the output power of the target traction substation;

[0059] If not, the support power is not adjusted;

[0060] Determining whether the current support power is greater than the rated power of the associated energy scheduling device;

[0061] If so, adjusting the current support power so that the support power is equal to the rated power of the associated energy scheduling device;

[0062] If not, the current support power is not adjusted.

[0063] A second aspect of an embodiment of the present invention discloses a control device for an energy dispatching device, which is applied to an energy management system. The energy management system is communicatively connected to the energy dispatching devices in each traction substation and each substation in a same-phase through-line traction power supply system. The control device includes:

[0064] A monitoring unit, used to monitor the running position of the target train in real time;

[0065] an energy dispatching unit, configured to randomly select one of the energy dispatching devices as the first control object each time when the operating position exceeds a preset distance from any of the partitions, execute an inner optimization strategy for the first control object, and obtain a dispatching instruction set corresponding to each energy dispatching device when it is the first control object, and an optimized total power required to be output by each traction substation when the dispatching instruction set is executed; the dispatching instruction set includes dispatching instructions corresponding to each energy dispatching device; and control each energy dispatching device to perform energy dispatch based on the dispatching instruction set corresponding to the minimum optimized total power;

[0066] The over-segment control unit is used to control each energy dispatching device based on a pre-established traction grid power flow equation when the operating position is less than or equal to the preset distance from any of the partitions, so that the voltage difference across each of the energy dispatching devices is within a preset voltage range.

[0067] A third aspect of an embodiment of the present invention discloses a storage medium for storing a computer program. When the computer program is executed, it is specifically used to implement the control method of the energy scheduling device described in any one of the first aspects of the embodiments of the present invention.

[0068] A fourth aspect of an embodiment of the present invention discloses an electronic device, including: a memory and a processor;

[0069] The memory is used to store computer programs;

[0070] The processor is used to execute the computer program, specifically to implement the control method of the energy scheduling device described in any one of the first aspects of the embodiments of the present invention.

[0071] Based on the above-mentioned embodiment of the present invention, a control method and related equipment for an energy dispatching device are provided to monitor the running position of a target train in real time; when the running position exceeds a preset distance from any of the partitions, one of the energy dispatching devices is randomly selected each time as the first control object, and an inner optimization strategy is executed for the first control object until all of the energy dispatching devices execute the inner optimization strategy as the first control object, thereby obtaining a dispatching instruction set corresponding to each of the energy dispatching devices when it is the first control object, and the optimized total power required to be output by each of the traction substations when the dispatching instruction set is executed; the dispatching instruction set includes dispatching instructions corresponding to each of the energy dispatching devices; based on the dispatching instruction set corresponding to the minimum optimized total power, each of the energy dispatching devices is controlled to perform energy dispatching; when the running position is less than or equal to the preset distance from any of the partitions, based on the pre-established traction grid power flow equation, each of the energy dispatching devices is controlled so that the voltage difference across each of the energy dispatching devices is within a preset voltage range. In this scheme, the power output of the energy dispatching device of the sub-area station is optimized and adjusted according to the operating status of the same-phase through-train traction power supply system, so as to achieve the full-line dispatching of the regenerative braking energy of trains in different power supply sections, smooth train crossing of sections, and reduce the negative sequence current of the 110kV power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0073] Figure 1 This is an architecture diagram of a same-phase through-going traction power supply system disclosed in an embodiment of the present invention;

[0074] Figure 2 This is a flow chart of a control method for an energy scheduling device disclosed in an embodiment of the present invention;

[0075] Figure 3 A structural diagram of a control device for an energy scheduling device disclosed in an embodiment of the present invention;

[0076] Figure 4 This is a structural diagram of an electronic device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0077] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0078] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0079] like Figure 1 As shown, it is an architecture diagram of a same-phase through-going traction power supply system disclosed in an embodiment of the present invention, including: multiple traction substations, multiple substations, traction lines, target trains, network switches and energy management systems.

[0080] The energy management system is connected to the energy dispatching device in each traction substation and each substation in the same phase through the traction power supply system through a network switch.

[0081] Each traction substation includes a power transformer and a co-phase power supply device. The input end of the power transformer is connected to the 110KV power grid. The power transformer has two output ends, one output end is connected to the traction line, and the other output end is connected to the input end of the co-phase power supply device. The output end of the co-phase power supply device is connected to the traction line.

[0082] It should be noted that the same-phase through-type traction power supply system can reduce the negative sequence current of the 110kV three-phase power grid caused by the unbalanced load between different power supply arms of the traditional single-phase power supply system. However, considering the power supply reliability and system cost, the traction substation generally does not use full-power power electronic devices to directly convert the three phases into single-phase output. Instead, it uses power transformers such as Scott transformers or v / V transformers to first step down the three-phase 110kV input voltage to two single-phase 27.5kV voltage outputs; one of the two 27.5kV output terminals of the power transformer (for example, Figure 1 11 of the No. 1 traction substation) is directly connected to the 27.5kV traction line, and the other 27.5kV output end is connected to the same-phase power supply device.

[0083] Therefore, it can be assumed that the traction substation connects a power transformer and a common-phase power supply unit in parallel to the 27.5kV traction line to provide power to the target train. This approach allows the traction substation to continue supplying power to the train via the power transformer even if the common-phase power supply unit fails, improving power supply reliability. Furthermore, the common-phase power supply unit can actively adjust its output power within its capacity range, maximizing its output power to match that of the transformer it is connected in parallel with, thereby reducing the negative-sequence current injected into the 110kV grid by the traction substation. However, for economic reasons, the rated capacity and overload capacity of the traction substation's power transformer are significantly greater than those of the common-phase power supply unit, typically with a ratio of 2:1 or 3:1. Therefore, when a large number of vehicles are operating on the line, there may be a significant difference in output power between the common-phase power supply unit and the power transformer, resulting in significant negative-sequence current at 110kV.

[0084] Generally speaking, when the traction line is short, it is simplified to assume that the differences in the 110kV power grids connected to each traction substation are small. By adjusting the connection groups of each power transformer, the amplitude and phase differences of the 27.5kV voltage output by each traction substation are small, and the traditional non-powered section of the traction line between two traction substations (usually tens of meters) can be eliminated.

[0085] However, when the traction line is long, the 110kV voltage and other parameters of each traction substation are different. At the same time, in order to avoid the short circuit fault in a power supply section affecting the power supply of other traction substations, an electrical segmentation area is set on the line between each two traction substations (for example, Figure 1 The part numbered 21 in the figure) is used to realize electrical insulation and mechanical connection of different power supply intervals (generally 1 to 2 meters) through the anchor section joints.

[0086] Therefore, there are still open circuits on the entire traction line. In order to ensure the utilization of regenerative braking energy of trains on the entire line, a sub-station is set up in the electrical segmentation area. The sub-station contains parallel energy dispatching devices at both ends of the electrical segmentation area, which constructs a path for energy flow in different power supply intervals.

[0087] It should be noted that the energy scheduling device can also actively control the power at both ends of the electrical segmentation area, that is, the power at both ends of the energy scheduling device.

[0088] Due to the existence of electrical segmentation, the pantograph is simultaneously connected to two power supply sections when a train passes through the segmentation. Differences in traction substation output voltage, length, number of running vehicles, and status between different power supply sections can lead to significant voltage differences across the segmentation, generating large surge currents and arcs in the pantograph, endangering power lines and related equipment. This can also cause severe voltage distortion at the point where the train connects to the grid, further inducing large inrush currents in the train's internal power supply system.

[0089] Based on the above embodiment of the present invention, a same-phase through-going traction power supply system is disclosed, such as Figure 2 FIG. 1 is a flow chart of a control method for an energy scheduling device disclosed in an embodiment of the present invention. The control method is applied to Figure 1 The energy management system shown mainly includes the following steps:

[0090] Step S201: monitor the running position of the target train in real time.

[0091] In step S201, the target train is connected to the energy management system for communication, and the target train sends running position information to the energy management system in real time.

[0092] Step S202: Determine whether the operating position is more than a preset distance from any partition; if so, execute step S203; if not, execute step S204.

[0093] In step S2, since the position of the substation is fixed and the energy management system pre-stores the position information of each substation, the distance between the running position and any substation can be calculated based on the running position of the target train and the position information of each substation.

[0094] Preferably, the preset distance is adjustable, generally 0.5 km to 1 km.

[0095] Preferably, when the operating position exceeds a preset distance from any sub-area, the energy dispatching devices of all sub-areas are controlled to operate in a power flow optimization dispatching mode, and step S203 is started.

[0096] Preferably, when the operating position is less than or equal to a preset distance from any sub-area, the energy dispatching device of each sub-area is controlled to stop the power flow dispatching mode. At this time, the energy dispatching device of each sub-area operates in a high configuration, stops energy dispatching between the two power supply sections, and begins executing step S204.

[0097] Step S203: Each time, one energy dispatching device is randomly selected as the first control object, and the inner optimization strategy is executed for the first control object until all energy dispatching devices execute the inner optimization strategy as the first control object. Then, the dispatching instruction set corresponding to each energy dispatching device as the first control object and the optimized total power required to be output by each traction substation when the dispatching instruction set is executed are obtained. Based on the dispatching instruction set corresponding to the minimum optimized total power, each energy dispatching device is controlled to perform energy dispatching.

[0098] The scheduling instruction set includes scheduling instructions corresponding to each energy scheduling device, and the scheduling instructions are used to be sent to the corresponding energy scheduling device to control the energy scheduling device to perform energy scheduling.

[0099] In step S203, it is mainly implemented through a double-layer nested optimization strategy, which specifically includes an outer layer optimization strategy and an inner layer optimization strategy.

[0100] In the outer optimization strategy, the energy dispatching device of a certain substation is first determined as the first control object through traversal, and then the dispatching instructions of the energy dispatching devices of all substations in the entire line are optimized through the inner optimization strategy to obtain the dispatching instruction set, and record the sum of the power of all traction substations in the entire line when dispatching based on the dispatching instruction set.

[0101] Assuming there are N traction substations along the entire line and N-1 substations, the number of iterations is N-1. After the iterations are complete, N-1 dispatch instruction sets are obtained. The sum of the power outputs of each traction substation when controlling energy dispatch based on these N-1 dispatch instruction sets is compared, and the dispatch instruction set with the minimum sum of power is found. This dispatch instruction set ensures maximum utilization of the train's regenerative braking energy.

[0102] In a specific implementation, the inner optimization strategy is executed for the first control object, including the following steps:

[0103] Step S31: The energy dispatching device corresponding to the first control object is used as the target energy dispatching device, the total power output by each traction substation on the first side of the target energy dispatching device is calculated to obtain the first power, and the total power output by each traction substation on the second side is calculated to obtain the second power.

[0104] It should be noted that the second side is the side in the direction of the target train's travel, and the first side is the side opposite to the direction of the target train's travel. Figure 1 Of the two sides of the energy dispatching device of the No. 1 substation, the side closer to the direction of travel of the target train is the second side.

[0105] For example, it is assumed that the first control object selected by the outer optimization strategy is the energy scheduling device of the 1# partition.

[0106] Calculate the total power on the traction lines on the left and right sides (i.e., the first side and the second side) of the energy dispatching device of the 1# sub-station, that is, the total power on the left side of the 1# sub-station is the power P1 of the 1# traction substation (i.e., the first power), and the total power on the right side of the 1# sub-station is the sum of the output powers of the 2# to N# traction substations P2' (i.e., the second power), P2'=P2+P3+...+PN. At the same time, all sub-stations and traction substations on the right side of the 1# sub-station are equivalent to the 2# traction substation.

[0107] Step S32: Based on the first power and the second power, determine the scheduling instruction corresponding to the target energy scheduling device.

[0108] The dispatching instructions include: dispatching direction and dispatching power.

[0109] In the specific implementation of step S32, when the first power is greater than 0 and the second power is less than 0, the scheduling direction is determined to be from the second side to the first side, and the scheduling power is determined to be equal to the second power. When the first power is less than 0 and the second power is greater than 0, the scheduling direction is determined to be from the first side to the second side, and the scheduling power is determined to be equal to the first power. Based on the scheduling direction and scheduling power, a scheduling instruction corresponding to the target energy scheduling device is obtained.

[0110] It should be noted that if the first power and the second power do not meet the above conditions, the energy scheduling device is controlled not to start the scheduling function, and the scheduling instruction of the energy scheduling device is 0.

[0111] For example, based on the first power P1 and the second power P2' obtained above, the power scheduling mode of the power supply intervals on both sides of the energy scheduling device in the 1# partition is determined:

[0112] (1) When P1>0 and P2'<0, the energy dispatching device is controlled to dispatch power from the equivalent 2# traction substation to the 1# traction substation, and the corresponding dispatching instruction Pe1=P2'.

[0113] (2) When P1<0 and P2'>0, the energy dispatching device is controlled to dispatch power from traction substation #1 to the equivalent traction substation #2, and the corresponding dispatching instruction Pe1=P1.

[0114] (3) In other cases, the energy scheduling device is controlled not to start the scheduling function, and the scheduling instruction of the energy scheduling device is 0.

[0115] It can be understood that the positive and negative signs in the scheduling instruction Pe1 represent the power scheduling direction, and the absolute value represents the scheduling power.

[0116] Step S33: Modify the dispatching instruction based on the preset power flow solution model.

[0117] In step S33, a power flow solution model for the traction power supply network is established based on the target train's operating position, the power absorbed or fed back from the 27.5 kV traction line, and the traction line impedance information. Based on the power flow solution model, the dispatch instruction obtained in step S32 is corrected taking into account the line transmission losses, the vehicle voltage constraints, and the efficiency of the energy dispatch device. The correction process specifically includes the following steps:

[0118] Step S331: Based on the power flow solution model and the dispatch instruction, a power flow calculation is performed to obtain a first optimized power and a second optimized power.

[0119] It should be noted that the first optimized power and the second optimized power are respectively the powers corresponding to the first side and the second side of the target energy scheduling device when the scheduling instruction is executed.

[0120] Exemplarily, based on the dispatch instruction Pe1 and the power flow solution model obtained above, power flow calculation is performed to obtain the first optimized power P1' and the second optimized power P2".

[0121] It can be understood that the first optimized power P1′ and the second optimized power P2″ are respectively the total power output by each traction substation on the first side and the second side of the target energy scheduling device when the scheduling instruction Pe1 is executed.

[0122] Step S332: Compare the first power, the second power, the first optimized power, and the second optimized power with 0 respectively to obtain comparison results.

[0123] Step S333: If the comparison result meets the preset correction condition, the adjustment amount of the scheduling instruction is determined, and the scheduling instruction is corrected based on the adjustment amount, and the process returns to step S331.

[0124] In step S333, the specific implementation process of determining the adjustment amount of the scheduling instruction and correcting the scheduling instruction based on the adjustment amount includes:

[0125] An adjustment amount of the scheduling instruction is determined according to the rated capacity of the target energy scheduling device corresponding to the scheduling instruction, a metaheuristic algorithm or a machine learning method; and a scheduling direction and / or scheduling power in the scheduling instruction is corrected based on the adjustment amount.

[0126] For example, taking the above-obtained dispatching instruction Pe1 as an example, the adjustment amount △Pe (i.e., the power change step) of the dispatching instruction Pe1 is determined. The adjustment amount △Pe can be 1% of the rated capacity of the target energy dispatching device. At the same time, the traction network complexity, algorithm operation time, and control accuracy can be comprehensively evaluated and corresponding adjustments can be made.

[0127] The adjustment process is: Pe1=sign(Pe1)*(|Pe1|-△Pe), where sign(Pe1) is used to determine the sign of the scheduling instruction Pe1, and |Pe1| is the absolute value of the scheduling instruction Pe1.

[0128] In particular, if the scheduling power in the scheduling instruction Pe1 reaches or exceeds the rated power of the target energy scheduling device, the scheduling instruction Pe1 is adjusted to Pe1=sign(Pe1)*5(MW).

[0129] It should be noted that the present invention does not limit the method for determining the adjustment amount, as long as the target energy scheduling device can ensure that the traction substation does not absorb additional electric energy from the 110kV power grid while performing regenerative braking energy scheduling.

[0130] Step S334: If the comparison result meets the preset correction end condition, when the number of power flow calculations is equal to 1, the current adjustment instruction is determined to be the corrected adjustment instruction; when the number of power flow calculations is greater than 1, the previous adjustment instruction is determined to be the corrected adjustment instruction.

[0131] For example, the following table shows the preset correction conditions and the preset correction end conditions:

[0132]

[0133]

[0134] It should be noted that, in the above table, serial numbers 1 and 4 are cases where the comparison results meet the preset correction conditions, and the other serial numbers are cases where the comparison results meet the preset correction end conditions.

[0135] Step S34: updating the first power based on the revised scheduling instruction, and adding the updated first power to the optimized total power.

[0136] Exemplarily, the first power is updated based on the revised scheduling instruction: P1=P1+Pe1.

[0137] It should be noted that the initial value of the optimized total power is 0. After the first execution of the inner optimization strategy, the optimized total power Pall = P1. When starting from the target energy scheduling device, all subsequent energy scheduling devices execute the inner optimization strategy, Pall = P1 + P2 + ... + PN.

[0138] Step S35: Calculate the output power of the traction substation between the target energy dispatching device and the adjacent energy dispatching device, and use it as the first power. Take the target energy dispatching device and the adjacent energy dispatching device as the new target energy dispatching device, calculate the total power output by each traction substation on the other side of the target energy dispatching device, and use it as the second power. Return to execute step S32 until there is no adjacent energy dispatching device to the target energy dispatching device.

[0139] It should be noted that if there are two adjacent energy scheduling devices as the target energy scheduling device, the processing will be performed in parallel in two ways.

[0140] For example, after the first inner optimization, the total output power of the equivalent 2# traction substation is the second optimized power P2". Similarly, the 3# traction substation to the N# traction substation is equivalent to the 3# traction substation, and its output power P3'=P3+...+PN. Then, after the first inner optimization, the total output power of the 2# traction substation is P2=P2"-P3'.

[0141] Then, the energy dispatching device between the 2# traction substation and the 3# traction substation is used as the target energy dispatching device, P2 is used as the first power, P3' is used as the second power, and the process returns to step S32.

[0142] That is to say, the energy scheduling device adjacent to the original target energy scheduling device is used as the new target energy scheduling device, and the original target energy scheduling device will not be selected as the target energy scheduling device again during this inner layer optimization process.

[0143] Finally, the optimized total power Pall = P1 + P2 + ... + PN and the corresponding scheduling instruction set (Pe1, Pe2, ..., PeN-1) obtained after the execution of this inner optimization strategy are used as output and saved. After each energy scheduling device executes the inner optimization strategy as the first control object, the outer optimization strategy is used to find the scheduling instruction set corresponding to the minimum value of the optimized total power. Based on the scheduling instruction set, each energy scheduling device is controlled to perform energy scheduling, which can ensure the maximum utilization of the train's regenerative braking energy.

[0144] In the above-mentioned embodiment of the present invention, the operating status and operating efficiency of the energy dispatching devices of the target train, traction substation and substation, as well as the energy transmission loss are comprehensively considered. Based on the power flow solution model, an optimization algorithm is used to find the optimal value of the active power instructions at both ends of all energy dispatching devices on the entire line, to ensure that the regenerated energy is maximized and utilized by the train without increasing the energy consumption of the train from the traction line.

[0145] Step S204: Based on the pre-established traction grid power flow equation, each energy dispatching device is controlled so that the voltage difference across each energy dispatching device is within a preset voltage range.

[0146] In step S204, all traction substations are equivalent to voltage sources with series output impedances, and the target train is equivalent to a power source. The traction substations, trains, and substations are considered nodes in the traction grid. Based on their location information and traction line impedance parameters, the admittance matrix of the traction grid is calculated, ultimately establishing the traction grid power flow equation.

[0147] The specific implementation process of step S204 includes the following steps:

[0148] Step S41: Based on the pre-established traction grid power flow equation and the output voltages of each traction substation, solve the voltages at both ends of each substation to obtain the first terminal voltage and the second terminal voltage.

[0149] In step S41, the output voltages of each traction substation and the target train's power are substituted into the traction grid power flow equation and solved using methods such as Picard or Newton-Raphson. This yields the voltages across each substation, denoted as Ux1 and Ux2. x represents the substation number, i.e., the xth substation.

[0150] by Figure 1 Taking the 1# partition in the example, the first terminal voltage is U11 and the second terminal voltage is U12. It can be considered that the first terminal voltage is Figure 1 The voltage at the left end of the 1# partition is Figure 1 The voltage at the right end of the 1# partition.

[0151] Step S42: For the energy scheduling device in each partition, determine a corresponding target output voltage based on the first terminal voltage and the second terminal voltage.

[0152] Step S42 includes two specific implementations:

[0153] The first method is to determine the average value of the first terminal voltage and the second terminal voltage as the corresponding target output voltage for the energy scheduling device in each partition, that is, Uxm=(Ux1+Ux2) / 2.

[0154] The second method is to determine the first terminal voltage or the second terminal voltage as the corresponding target output voltage for the energy scheduling device in each partition, that is, Uxm=Ux1 or Uxm=Ux2.

[0155] Among them, Uxm is the target output voltage of a certain energy scheduling device.

[0156] It should be noted that the target output voltage is the voltage expected to be output at the left and right ends of the energy scheduling device, and the output voltages at the two ends are intended to be close to the same.

[0157] Step S43: Based on the traction grid power flow equation and each target output voltage, solve the power at both ends of each energy dispatching device to obtain the first end power and the second end power.

[0158] In step S43, each traction substation and energy dispatching device is set as a voltage source, and the target train is set as a power source. The output voltage of each traction substation, the target output voltage corresponding to each energy dispatching device, and the power of the target train are substituted into the traction grid power flow equation, and solved by Picard or Newton-Raphson methods to obtain the output power at both ends of each energy dispatching device, that is, the first-end power Sx1 and the second-end power Sx2.

[0159] Among them, it can be considered that Sx1 is the output power of the left side of each energy scheduling device, and Sx2 is the output power of the right side of each energy scheduling device.

[0160] Step S44: For each energy scheduling device, adjust the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and the preset power adjustment rule, and generate a power output instruction based on the adjusted first-end power and second-end power.

[0161] The specific implementation process of step S44 includes the following steps:

[0162] Step S441: Determine whether the sum of the power at the first end and the power at the second end exceeds the rated power of the energy scheduling device. If so, proceed to step S442.

[0163] Step S442: adjusting the power at the first end and the power at the second end so that the sum of the power at the first end and the power at the second end does not exceed the rated power.

[0164] In step S442 , the power Sx1 at the first end and the power Sx2 at the second end are adjusted in proportion or according to other rules so that the sum of the power at the first end and the power at the second end does not exceed the rated power.

[0165] It should be noted that Sx1 and Sx2 are complex powers including active power and reactive power.

[0166] In one embodiment, if the sum of the first-end power and the second-end power does not exceed the rated power of the energy scheduling device, and the energy scheduling device is not configured with an energy storage unit (buffer capacitor, etc.), it is determined whether the sum of the first-end power and the active power in the second-end power is 0; if so, the first-end power and the second-end power are not adjusted; if not, the first-end power and the second-end power are adjusted so that the sum of the first-end power and the second-end power does not exceed the rated power, and the sum of the active power in the first-end power and the second-end power is 0.

[0167] Step S443: Based on the traction grid power flow equation, the current first-end power and the current second-end power, solve the voltage difference between the two ends of the energy dispatching device, and determine whether the voltage difference is within the pre-set voltage range. If so, execute step S444; if not, execute step S445.

[0168] The predetermined voltage range may be within 1 kV.

[0169] In step S443, the traction substation is set as the voltage source, the target train and the energy dispatching device are set as the power source, the output voltage of the traction substation, the current first-end power Sx1 and the current second-end power Sx2 of the energy dispatching device, and the power of the target train are substituted into the traction grid flow equation, and the actual voltage at both ends of each energy dispatching device is solved by the Picard or Newton-Raphson method to obtain the voltage difference between the two ends.

[0170] It should be noted that the actual voltage here refers to the actual voltage across the energy scheduling device when the energy scheduling device is controlled to output the first-end power Sx1 and the second-end power Sx2 obtained above.

[0171] Step S444: If the voltage difference is within the preset voltage range, a power output instruction is generated based on the adjusted first-end power and the adjusted second-end power.

[0172] Step S445: If the voltage difference is not within the preset voltage range, the current first-end power and the current second-end power are adjusted for the second time, and the process returns to step S443 until the number of returns reaches the preset number, and a reminder signal is sent to the line signal system indicating that the voltage difference exceeds the preset voltage range.

[0173] In step S445, to prevent the algorithm from running too long or entering an infinite loop, an upper limit (i.e., a preset number) is set for the number of returns. If the voltage difference across the energy dispatch device still exceeds the preset voltage range after the number of returns reaches the upper limit, a warning signal is sent to the line signal system, reminding the target train that the voltage difference across the sub-station is too high when passing through the sub-station. The target train should use a phase-by-phase method to pass through the sub-station. In other words, the target train reduces train power before passing through the sub-station, and disconnects the circuit breaker connecting the target train to the traction line power supply circuit.

[0174] Step S45: Sending a corresponding power output instruction to each energy scheduling device to control the power at both ends of each energy scheduling device so that the voltage difference at both ends of the energy scheduling device is within a preset voltage range.

[0175] In the above-mentioned embodiment of the present invention, the running position of the target train is monitored. When the target train reaches the segmentation area (generally 1km to 0.5km away from the sub-area), the active and reactive powers at both ends of the energy dispatching device are adjusted through power flow calculation, and the voltage amplitude and phase at both ends are adjusted to be consistent, thereby reducing the voltage difference between different power supply intervals at both ends of the segmentation area, thereby avoiding the arcing of the pantograph when the train passes the segment, resulting in line inrush current and voltage distortion, as well as the train current impact caused by voltage distortion, so as to ensure that the train passes the segment smoothly.

[0176] In one embodiment, when there are many vehicles running on the line, there may be a large difference in the output power of the same-phase power supply device and the power transformer, resulting in a large amount of negative sequence current at 110 kV. Therefore, the control method of the energy dispatching device disclosed in the present invention further includes the following steps:

[0177] Step S301: When the operating position exceeds a preset distance from any substation, for each traction substation, if it is detected that the output power of the power transformer exceeds the output power of the same-phase power supply device and reaches a preset power range, it is determined as the target traction substation.

[0178] In step S301, the target train's location is monitored to determine if any trains are crossing phases in each substation. If the output power of the 27.5kV power transformer at a traction substation exceeds 1.5 times the output power of the parallel-connected power supply device (this can be adjusted based on actual conditions), the substation is identified as the target.

[0179] In one embodiment, if the output power of the 27.5kV side power transformer of the adjacent traction substation of the target traction substation also exceeds 1.5 times the output power of the same-phase power supply device connected in parallel with it, negative sequence current control will not be performed on the target traction substation. The reason is:

[0180] The embodiment of the present invention utilizes the surplus capacity of adjacent traction substations to provide energy relief to the target traction substation. If the adjacent traction substation itself has a relatively large load, it loses the energy relief capability.

[0181] Step S302: Calculate the support power required by the target traction substation from the adjacent traction substations.

[0182] In the specific implementation of step S302, the difference between the rated power and the actual output power of the same-phase power supply devices in adjacent traction substations is calculated, and then doubled to obtain the support power required by the target traction substation from the adjacent traction substations. Specifically, support power Pz = (rated power of the same-phase power supply devices in adjacent traction substations - actual output power) * 2.

[0183] Step S303: adjusting the support power based on the output power of the target traction substation and the rated power of the associated energy dispatching device.

[0184] Among them, the associated energy dispatching device is an energy dispatching device between the target traction substation and the adjacent traction substation.

[0185] In the specific implementation process of step S303, in the first step, it is determined whether the output power of the target traction substation is less than the support power; if so, the support power is adjusted to be equal to the output power of the target traction substation; if not, the support power is not adjusted. That is:

[0186] Compare the magnitude of the output power Pqian (the sum value between the output power of the power transformer and the output power of the single-phase power supply device) of the target traction substation and the support power Pz; if Pqian >= Pz, the support power Pz remains unchanged; if Pqian < Pz, the support power Pz is set to Pqian.

[0187] In the second step, it is determined whether the current support power (i.e., the support power obtained after the first step) is greater than the rated power of the associated energy dispatching device; if so, the current support power is adjusted to be equal to the rated power of the associated energy dispatching device; if not, the current support power is not adjusted. That is:

[0188] Compare the magnitude of the support power Pz obtained in the first step and the rated power Pede of the energy dispatching device connected to the traction substation; if Pz <= Pede, the support power Pz remains unchanged; if Pz > Pede, the support power Pz is set to Pede.

[0189] Step S304: Control the associated energy dispatching device to provide the adjusted support power to the target traction substation.

[0190] In step S304, a support instruction is generated based on the adjusted support power Pz and sent to the energy dispatching device of the corresponding section post to control it to provide support power to the traction substation, reduce the power difference between the output power of the 27.5 kV side power transformer and the output power of the single-phase power supply device in parallel with it, and further reduce the negative sequence current of the 110 kV power grid.

[0191] In the above embodiments of the present invention, by monitoring the power consumption of each traction substation's power transformer, single-phase power supply device, and trains, when there is a large difference in the output power of the traction substation's power transformer and the single-phase power supply device, power dispatching is performed from different traction substations through the energy dispatching device within the entire line range to minimize the difference in the output power of the power transformer and the single-phase power supply device as much as possible, thereby reducing the negative sequence current of the 110 kV power grid.

[0192] Based on the control method of an energy dispatching device disclosed in the above embodiments of the present invention, according to the operating state of the single-phase through traction power supply system, the power output of the energy dispatching device of the section post is optimized and adjusted to achieve the purpose of full-line dispatching of the regenerative braking energy of trains in different power supply intervals, smooth train passing through sections, and reducing the negative sequence current of the 110 kV power grid.

[0193] Based on the control method of an energy scheduling device disclosed in the above embodiment of the present invention, Figure 3 FIG. 1 is a structural diagram of a control device for an energy scheduling device disclosed in an embodiment of the present invention. The control device is applied to Figure 1 The energy management system shown includes: a monitoring unit 100 , an energy scheduling unit 200 and an over-segmentation control unit 300 .

[0194] The monitoring unit 100 is used to monitor the running position of the target train in real time.

[0195] The energy dispatching unit 200 is used to randomly select an energy dispatching device as the first control object each time when the operating position exceeds a preset distance from any partition, and execute the inner optimization strategy for the first control object until all energy dispatching devices execute the inner optimization strategy as the first control object, thereby obtaining the dispatching instruction set corresponding to each energy dispatching device as the first control object, and the optimized total power that each traction substation needs to output when the dispatching instruction set is executed; the dispatching instruction set contains the dispatching instructions corresponding to each energy dispatching device; based on the dispatching instruction set corresponding to the minimum optimized total power, each energy dispatching device is controlled to perform energy dispatching.

[0196] Preferably, the energy scheduling unit 200 is specifically configured to:

[0197] The energy dispatching device corresponding to the first control object is used as the target energy dispatching device, the total power output by each traction substation on a first side of the target energy dispatching device is calculated to obtain a first power, and the total power output by each traction substation on a second side is calculated to obtain a second power; the second side is the side in the direction of travel of the target train, and the first side is the side opposite to the direction of travel of the target train;

[0198] Determining a scheduling instruction corresponding to the target energy scheduling device based on the first power and the second power; the scheduling instruction includes: a scheduling direction and a scheduling power;

[0199] Modify dispatch instructions based on the preset power flow solution model;

[0200] updating the first power based on the revised scheduling instruction, and adding the updated first power to the optimized total power;

[0201] Calculate the output power of the traction substation between the target energy dispatching device and the adjacent energy dispatching device, and use it as the first power. Take the target energy dispatching device and the adjacent energy dispatching device as the new target energy dispatching device, calculate the total power output by each traction substation on the other side of the target energy dispatching device, and use it as the second power. Return to the step of determining the dispatching instruction corresponding to the target energy dispatching device based on the first power and the second power until there is no adjacent energy dispatching device to the target energy dispatching device.

[0202] Preferably, the energy scheduling unit 200 for determining a scheduling instruction corresponding to the target energy scheduling device based on the first power and the second power is specifically configured to:

[0203] When the first power is greater than 0 and the second power is less than 0, determining that the scheduling direction is a direction from the second side to the first side, and determining that the scheduling power is equal to the second power;

[0204] When the first power is less than 0 and the second power is greater than 0, determining that the scheduling direction is a direction from the first side to the second side, and determining that the scheduling power is equal to the first power;

[0205] Based on the scheduling direction and scheduling power, the scheduling instruction corresponding to the target energy scheduling device is obtained.

[0206] Preferably, the energy scheduling unit 200 for correcting the scheduling instruction based on the preset power flow solution model is specifically configured to:

[0207] Based on the power flow solution model and the scheduling instruction, a power flow calculation is performed to obtain a first optimized power and a second optimized power; the first optimized power and the second optimized power are respectively the powers corresponding to the first side and the second side of the target energy scheduling device when the scheduling instruction is executed;

[0208] Compare the first power, the second power, the first optimized power, and the second optimized power with 0 respectively to obtain comparison results;

[0209] If the comparison result meets the preset correction condition, the adjustment amount of the dispatch instruction is determined, and the dispatch instruction is corrected based on the adjustment amount, and the process returns to the step of performing a power flow calculation based on the power flow solution model and the dispatch instruction to obtain the first optimized power and the second optimized power;

[0210] If the comparison result meets the preset correction end condition, when the number of power flow calculations is equal to 1, the current adjustment instruction is determined to be the corrected adjustment instruction; when the number of power flow calculations is greater than 1, the previous adjustment instruction is determined to be the corrected adjustment instruction.

[0211] Preferably, the adjustment amount of the scheduling instruction is determined, and the scheduling instruction is corrected based on the adjustment amount, including: determining the adjustment amount of the scheduling instruction according to the rated capacity of the target energy scheduling device corresponding to the scheduling instruction, a metaheuristic algorithm or a machine learning method; and correcting the scheduling direction and / or scheduling power in the scheduling instruction based on the adjustment amount.

[0212] The over-segment control unit 300 is used to control each energy dispatching device based on a pre-established traction grid power flow equation when the operating position is less than or equal to a preset distance from any partition, so that the voltage difference across each energy dispatching device is within a preset voltage range.

[0213] Preferably, the over-segment control unit 300 is specifically configured to:

[0214] Based on the pre-established traction grid power flow equation and the output voltage of each traction substation, the voltages at both ends of each substation are solved to obtain the first terminal voltage and the second terminal voltage;

[0215] For the energy scheduling device in each partition, determining a corresponding target output voltage based on the first terminal voltage and the second terminal voltage;

[0216] Based on the traction grid power flow equation and each target output voltage, the power at both ends of each energy dispatch device is solved to obtain the first end power and the second end power;

[0217] For each energy scheduling device, adjusting the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generating a power output instruction based on the adjusted first-end power and second-end power;

[0218] A corresponding power output instruction is sent to each energy scheduling device to control the power at both ends of each energy scheduling device so that the voltage difference at both ends of the energy scheduling device is within a preset voltage range.

[0219] Preferably, the over-segment control unit 300 for determining the corresponding target output voltage of the energy scheduling device in each sub-zone based on the first terminal voltage and the second terminal voltage is specifically configured to:

[0220] For the energy scheduling device in each partition, the average value of the first terminal voltage and the second terminal voltage is determined as the corresponding target output voltage; or, for the energy scheduling device in each partition, the first terminal voltage or the second terminal voltage is determined as the corresponding target output voltage.

[0221] Preferably, the over-segment control unit 300 is configured to adjust the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generate a power output instruction based on the adjusted first-end power and second-end power, specifically for:

[0222] Determine whether the sum of the power at the first end and the power at the second end exceeds the rated power of the energy scheduling device;

[0223] If so, adjusting the power at the first end and the power at the second end so that the sum of the power at the first end and the power at the second end does not exceed the rated power;

[0224] Based on the traction grid power flow equation, the current power at the first terminal and the current power at the second terminal, the voltage difference between the two ends of the energy dispatch device is solved;

[0225] If the voltage difference is within the preset voltage range, generating a power output instruction based on the adjusted first-end power and the adjusted second-end power;

[0226] If the voltage difference is not within the preset voltage range, the current first-end power and the current second-end power are adjusted twice, and the step of solving the voltage difference at both ends of the energy dispatching device based on the traction grid flow equation, the current first-end power and the current second-end power is returned to execute until the number of returns reaches the preset number, and a reminder signal indicating that the voltage difference exceeds the preset voltage range is sent to the line signal system.

[0227] Preferably, if the DC bus of the energy scheduling device is not configured with an energy storage unit, and the sum of the first-end power and the second-end power does not exceed the rated power of the energy scheduling device, it is determined whether the sum of the active power in the first-end power and the second-end power is 0; if so, the first-end power and the second-end power are not adjusted; if not, the first-end power and the second-end power are adjusted so that the sum of the first-end power and the second-end power does not exceed the rated power, and the sum of the active power in the first-end power and the second-end power is 0.

[0228] Preferably, the control device further comprises:

[0229] A negative sequence current control unit is configured to determine each traction substation as a target traction substation when the operating position exceeds a preset distance from any substation and detects that the output power of the power transformer exceeds the output power of the same-phase power supply device and reaches a preset power range;

[0230] Calculate the support power required by the target traction substation from the adjacent traction substations;

[0231] The support power is adjusted based on the output power of the target traction substation and the rated power of the associated energy dispatch device; the associated energy dispatch device is the energy dispatch device between the target traction substation and the adjacent traction substation;

[0232] The control-associated energy dispatching device provides adjusted support power to the target traction substation.

[0233] Preferably, the negative sequence current control unit for calculating the support power required by the target traction substation from the adjacent traction substation is specifically configured to:

[0234] Calculate the difference between the rated power and actual output power of the same-phase power supply devices in adjacent traction substations, and double the difference to obtain the support power required by the target traction substation from the adjacent traction substations.

[0235] Preferably, the negative-sequence current control unit for adjusting the support power based on the output power of the target traction substation and the rated power of the associated energy dispatching device is specifically used to: determine whether the output power of the target traction substation is less than the support power; if so, adjust the support power so that the support power is equal to the output power of the target traction substation; if not, do not adjust the support power; determine whether the current support power is greater than the rated power of the associated energy dispatching device; if so, adjust the current support power so that the support power is equal to the rated power of the associated energy dispatching device; if not, do not adjust the current support power.

[0236] Based on the control device of an energy dispatching device disclosed in the above-mentioned embodiment of the present invention, the power output of the energy dispatching device of the sub-area is optimized and adjusted according to the operating status of the same-phase through-type traction power supply system, so as to achieve the full-line dispatching of the regenerative braking energy of trains in different power supply sections, smooth train sectioning, and reduce the negative sequence current of the 110kV power grid.

[0237] The present invention also provides an electronic device, please refer to Figure 4 , the electronic device includes a memory 401 and a processor 402.

[0238] The memory 401 is used to store computer programs;

[0239] The processor 402 is used to execute a computer program, specifically to implement the control method of the energy scheduling device provided in any embodiment of the present application.

[0240] The present application also provides a computer storage medium for storing a computer program. When the computer program is executed, it is specifically used to implement the control method of the energy scheduling device provided in any embodiment of the present application.

[0241] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple. For relevant parts, refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without expending creative work.

[0242] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0243] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for an energy scheduling device, characterized in that: Applied to an energy management system, the energy management system is communicatively connected to each traction substation and energy dispatching device in each substation within a same-phase through-line traction power supply system, and the control method includes: Real-time monitoring of the target train's running position; When the operating position is more than a preset distance away from any of the partitions, one of the energy dispatching devices is randomly selected each time as the first control object, and the inner optimization strategy is executed for the first control object. After all the energy dispatching devices execute the inner optimization strategy as the first control object, a dispatching instruction set corresponding to each of the energy dispatching devices as the first control object and the optimized total power required to be output by each of the traction substations when the dispatching instruction set is executed are obtained; the dispatching instruction set includes dispatching instructions corresponding to each of the energy dispatching devices; The inner optimization strategy includes: taking the energy dispatching device corresponding to the first control object as the target energy dispatching device, calculating the total power output by each traction substation on the first side of the target energy dispatching device to obtain a first power, and calculating the total power output by each traction substation on the second side to obtain a second power; the second side is the side of the target train's travel direction, and the first side is the side opposite to the target train's travel direction; based on the first power and the second power, determining the dispatching instruction corresponding to the target energy dispatching device; the dispatching instruction includes: dispatching direction and dispatching power; Controlling each of the energy scheduling devices to perform energy scheduling based on the scheduling instruction set corresponding to the minimum optimized total power; When the operating position is less than or equal to the preset distance from any of the partitions, each energy dispatching device is controlled based on a pre-established traction grid power flow equation so that the voltage difference across each of the energy dispatching devices is within a preset voltage range.

2. The method according to claim 1, characterized in that The inner layer optimization strategy further includes: Modifying the dispatch instruction based on a preset power flow solution model; updating the first power based on the revised scheduling instruction, and adding the updated first power to the optimized total power; Calculate the output power of the traction substation between the target energy dispatching device and the adjacent energy dispatching device, and use it as the first power. Take the target energy dispatching device and the adjacent energy dispatching device as the new target energy dispatching device, calculate the total power output by each traction substation on the other side of the target energy dispatching device, and use it as the second power. Return to the step of determining the dispatching instruction corresponding to the target energy dispatching device based on the first power and the second power until there is no adjacent energy dispatching device to the target energy dispatching device.

3. The method according to claim 2, characterized in that The determining, based on the first power and the second power, a scheduling instruction corresponding to the target energy scheduling device includes: When the first power is greater than 0 and the second power is less than 0, determining that the scheduling direction is from the second side to the first side, and determining that the scheduling power is equal to the second power; When the first power is less than 0 and the second power is greater than 0, determining that the scheduling direction is a direction from the first side to the second side, and determining that the scheduling power is equal to the first power; Based on the scheduling direction and the scheduling power, a scheduling instruction corresponding to the target energy scheduling device is obtained.

4. The method according to claim 2, characterized in that The modifying of the dispatch instruction based on a preset power flow solution model includes: Based on the power flow solution model and the scheduling instruction, a power flow calculation is performed to obtain a first optimized power and a second optimized power; the first optimized power and the second optimized power are respectively the powers corresponding to the first side and the second side of the target energy scheduling device when the scheduling instruction is executed; respectively comparing the first power, the second power, the first optimized power, and the second optimized power with 0 to obtain comparison results; If the comparison result meets the preset correction condition, an adjustment amount of the scheduling instruction is determined, and the scheduling instruction is corrected based on the adjustment amount, and the process returns to the step of performing a power flow calculation based on the power flow solution model and the scheduling instruction to obtain a first optimized power and a second optimized power; If the comparison result meets the preset correction end condition, then when the number of flow calculations is equal to 1, the current scheduling instruction is determined to be the revised scheduling instruction; when the number of flow calculations is greater than 1, the previous scheduling instruction is determined to be the revised scheduling instruction.

5. The method according to claim 4, characterized in that Determining the adjustment amount of the scheduling instruction and modifying the scheduling instruction based on the adjustment amount includes: determining an adjustment amount of the scheduling instruction according to a rated capacity of the target energy scheduling device corresponding to the scheduling instruction, a metaheuristic algorithm, or a machine learning method; The scheduling direction and / or scheduling power in the scheduling instruction is modified based on the adjustment amount.

6. The method according to claim 1, characterized in that When the operating position is less than or equal to the preset distance from any of the partitions, controlling each energy dispatching device based on a pre-established traction grid power flow equation so that the voltage difference across each of the energy dispatching devices is within a preset voltage range includes: Based on a pre-established traction grid power flow equation and the output voltage of each traction substation, solving the voltages at both ends of each substation to obtain a first terminal voltage and a second terminal voltage; For the energy scheduling device in each of the partitions, determining a corresponding target output voltage based on the first terminal voltage and the second terminal voltage; Solving the power at both ends of each energy dispatching device based on the traction grid power flow equation and each of the target output voltages to obtain a first end power and a second end power; For each of the energy scheduling devices, adjusting the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generating a power output instruction based on the adjusted first-end power and second-end power; The corresponding power output instruction is sent to each of the energy scheduling devices to control the power at both ends of each energy scheduling device so that the voltage difference at both ends of the energy scheduling device is within a preset voltage range.

7. The method according to claim 6, characterized in that The energy scheduling device in each of the partitions determines a corresponding target output voltage based on the first terminal voltage and the second terminal voltage, including: For the energy scheduling device in each of the partitions, determining an average value of the first terminal voltage and the second terminal voltage as a corresponding target output voltage; or, For the energy scheduling device in each of the partitions, the first terminal voltage or the second terminal voltage is determined as the corresponding target output voltage.

8. The method according to claim 6, characterized in that The adjusting the corresponding first-end power and second-end power based on the rated power of the energy scheduling device and a preset power adjustment rule, and generating a power output instruction based on the adjusted first-end power and second-end power, includes: determining whether the sum of the power at the first end and the power at the second end exceeds the rated power of the energy scheduling device; If yes, adjusting the power at the first end and the power at the second end so that the sum of the power at the first end and the power at the second end does not exceed the rated power; Calculating a voltage difference between the two ends of the energy dispatching device based on the traction grid power flow equation, the current power at the first end, and the current power at the second end; If the voltage difference is within a preset voltage range, generating a power output instruction based on the adjusted first-end power and the adjusted second-end power; If the voltage difference is not within the preset voltage range, the current first-end power and the current second-end power are adjusted twice, and the step of solving the voltage difference between the two ends of the energy scheduling device based on the traction grid flow equation, the current first-end power and the current second-end power is returned to execute until the number of returns reaches the preset number, and a reminder signal is sent to the line signal system indicating that the voltage difference exceeds the preset voltage range.

9. The method according to claim 8, characterized in that If the DC bus of the energy scheduling device is not configured with an energy storage unit, the method further includes: If the sum of the first-end power and the second-end power does not exceed the rated power of the energy scheduling device, determining whether the sum of the active power in the first-end power and the second-end power is 0; If yes, then the power at the first end and the power at the second end are not adjusted; If not, the first-end power and the second-end power are adjusted so that the sum of the first-end power and the second-end power does not exceed the rated power, and the sum of the active power in the first-end power and the second-end power is 0.

10. The method according to claim 1, characterized in that: The traction substation is composed of a power transformer and a co-phase power supply device connected in parallel, and the method further includes: When the operating position is more than a preset distance away from any of the sub-stations, for each of the traction substations, if it is detected that the output power of the power transformer exceeds the output power of the same-phase power supply device and reaches a preset power range, the substation is determined to be the target traction substation; Calculating the support power required by the target traction substation from adjacent traction substations; adjusting the support power based on the output power of the target traction substation and the rated power of an associated energy dispatching device; the associated energy dispatching device is the energy dispatching device between the target traction substation and the adjacent traction substation; The associated energy dispatching device is controlled to provide the adjusted support power to the target traction substation.

11. The method according to claim 10, characterized in that The calculating of the support power required by the target traction substation from adjacent traction substations includes: The difference between the rated power and the actual output power of the same-phase power supply device in the adjacent traction substation is calculated, and twice the difference is calculated to obtain the support power required by the target traction substation from the adjacent traction substation.

12. The method according to claim 10, characterized in that Adjusting the support power based on the output power of the target traction substation and the rated power of the associated energy dispatching device includes: determining whether the output power of the target traction substation is less than the support power; If so, adjusting the support power so that the support power is equal to the output power of the target traction substation; If not, the support power is not adjusted; Determining whether the current support power is greater than the rated power of the associated energy scheduling device; If so, adjusting the current support power so that the support power is equal to the rated power of the associated energy scheduling device; If not, the current support power is not adjusted.

13. A control device for an energy scheduling device, characterized in that: Applied to an energy management system, the energy management system is communicatively connected to each traction substation and each substation energy dispatching device in the same phase through-going traction power supply system, the control device includes: A monitoring unit, used to monitor the running position of the target train in real time; an energy dispatching unit, configured to randomly select one of the energy dispatching devices as the first control object each time when the operating position exceeds a preset distance from any of the partitions, execute an inner optimization strategy for the first control object, and obtain a dispatching instruction set corresponding to each energy dispatching device when it is the first control object, and an optimized total power required to be output by each traction substation when the dispatching instruction set is executed; the dispatching instruction set includes dispatching instructions corresponding to each energy dispatching device; and control each energy dispatching device to perform energy dispatch based on the dispatching instruction set corresponding to the minimum optimized total power; The inner optimization strategy includes: taking the energy dispatching device corresponding to the first control object as the target energy dispatching device, calculating the total power output by each traction substation on the first side of the target energy dispatching device to obtain a first power, and calculating the total power output by each traction substation on the second side to obtain a second power; the second side is the side of the target train's travel direction, and the first side is the side opposite to the target train's travel direction; based on the first power and the second power, determining the dispatching instruction corresponding to the target energy dispatching device; the dispatching instruction includes: dispatching direction and dispatching power; The over-segment control unit is used to control each energy dispatching device based on a pre-established traction grid power flow equation when the operating position is less than or equal to the preset distance from any of the partitions, so that the voltage difference across each of the energy dispatching devices is within a preset voltage range.

14. A storage medium, characterized in that Used to store a computer program, which, when executed, is specifically used to implement the control method of the energy scheduling device according to any one of claims 1 to 12.

15. An electronic device, characterized in that: include: memory and processor; The memory is used to store computer programs; The processor is used to execute the computer program, specifically to implement the control method of the energy scheduling device according to any one of claims 1 to 12.

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