Traction power supply regenerative braking energy scheduling method and system

Abstract

The invention relates to a traction power supply regenerative braking energy scheduling method and system. The method comprises the steps that real-time power information of any two adjacent traction substations is collected; real-time power information of any two adjacent traction substations is updated in real time, an energy scheduling reference value is obtained through calculation based on the real-time power information updated in real time, and an energy scheduling value is determined through the energy scheduling reference value; and completing energy bidirectional transfer scheduling between any two adjacent traction substations based on the energy scheduling value. According to the method, a high-reliability communication network and a data consistency algorithm are adopted, and it is guaranteed that the energy dispatching device of the subsection transfers the locomotive regenerative braking energy to the adjacent substation section to be used by a traction train under the condition that the locomotive regenerative braking energy cannot be utilized in the substation section.

Description

Technical Field

[0001] The present disclosure relates to the technical field of locomotive traction, and particularly to a method and system for regenerative braking energy scheduling of traction power supply. Background Art

[0002] High-power AC electric locomotives on electrified railways adopt a master-slave braking mode mainly based on regenerative braking and supplemented by air braking, and a large amount of regenerative braking energy will be generated during the braking process. At present, the main ways of consuming regenerative braking energy are utilization by the same-arm traction train, consumption by traction power supply equipment, and feeding back to the power grid. However, the above methods have obvious deficiencies and cannot make full use of regenerative braking energy, which are mainly reflected in: (1) Low utilization rate of regenerative braking energy and a large amount of energy fed back to the power grid. The same-arm utilization method highly depends on the train operation diagram. If the train operation density is small, the utilization rate of regenerative braking energy of this method will be greatly reduced. It is estimated that about 48% of the regenerative braking energy generated by the braking train is utilized by the same-arm traction train, about 2% is consumed by the traction power supply equipment, and the remaining 50% of the regenerative braking energy is fed back to the power grid. (2) Low economic benefit of energy feeding. As a first-class load, the railway draws power from the large power grid, and the power grid company charges for its forward power consumption. For the regenerative braking energy fed back to the power grid, the policy of "positive counting for feeding back" or "not counting for feeding back" is adopted, and this part of the energy fed back to the power grid will not bring any benefits to the railway power supply department, thus causing huge economic losses to the railway department. (3) Poor power quality of energy feeding. The traction power supply system is single-phase. If the regenerative braking energy is directly fed back to the three-phase power system, serious negative sequence current will be generated on the grid side, resulting in the imbalance of the 110 kV or 220 kV three-phase power grid and reducing the utilization rate of the transformer capacity. Especially in heavy-haul railways with high density and large load (ten thousand-ton level), the above problems will be more prominent. Summary of the Invention

[0003] The present disclosure provides a method and system for regenerative braking energy scheduling of traction power supply to solve at least one of the above problems existing in the consumption of regenerative braking energy during the braking process of current railway electric locomotives.

[0004] On the one hand, the present disclosure provides a method for regenerative braking energy scheduling of traction power supply, including:

[0005] Collecting the real-time power information of any two adjacent traction substations;

[0006] Updating the real-time power information of the any two adjacent traction substations in real time, calculating an energy scheduling reference value based on the real-time updated real-time power information, and determining an energy scheduling value by using the energy scheduling reference value;

[0007] Completing the two-way energy transfer scheduling between the any two adjacent traction substations based on the energy scheduling value.

[0008] In some embodiments, the real-time power information of any two adjacent traction substations includes the first communication network real-time power information P1 and the second communication network real-time power information P2 of traction substation A, and the first communication network real-time power information P3 and the second communication network real-time power information P4 of traction substation B; wherein, the first communication network and the second communication network are redundant to each other.

[0009] In some embodiments, the real-time updating of the real-time power information of any two adjacent traction substations includes: real-time updating the real-time power information PA of traction substation A to P1 or P2 or 0 according to the dispatching system time, the first time information of the first communication network of traction substation A, and the first time information of the second communication network of traction substation A, and at the same time, real-time updating the real-time power information PB of traction substation B to P3 or P4 or 0 according to the dispatching system time, the first time information of the first communication network of traction substation B, and the first time information of the second communication network of traction substation B.

[0010] In some embodiments, the real-time updating of the real-time power information PA of traction substation A to P1 or P2 or 0 according to the dispatching system time, the first time information of the first communication network of traction substation A, and the first time information of the second communication network of traction substation A, and at the same time, the real-time updating of the real-time power information PB of traction substation B to P3 or P4 or 0 according to the dispatching system time, the first time information of the first communication network of traction substation B, and the first time information of the second communication network of traction substation B specifically includes:

[0011] Judging whether the absolute differences between the dispatching system time and the first time information of the first communication network of traction substation A and the first time information of the second communication network of traction substation A are less than a preset first time synchronization threshold:

[0012] If the absolute difference between the dispatching system time and the first time information of the first communication network of traction substation A is less than the preset first time synchronization threshold, then update the real-time power information PA of traction substation A to P1;

[0013] If the absolute difference between the dispatching system time and the first time information of the second communication network of traction substation A is less than the preset first time synchronization threshold, then update the real-time power information PA of traction substation A to P2;

[0014] Otherwise, update the real-time power information PA of traction substation A to 0;

[0015] Meanwhile, determine whether the absolute differences between the dispatching system time and the first time information of the first communication network of the B traction substation and the first time information of the second communication network of the B traction substation are less than a preset first time synchronization threshold:

[0016] If the absolute difference between the dispatching system time and the first time information of the first communication network of the B traction substation is less than the preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P3;

[0017] If the absolute difference between the dispatching system time and the first time information of the second communication network of the B traction substation is less than the preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P4;

[0018] Otherwise, update the real-time power information PB of the B traction substation to 0.

[0019] In some embodiments, calculating the energy dispatching reference value based on the real-time updated real-time power information includes:

[0020] Obtain the energy dispatching condition based on the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation and determine the energy dispatching reference value.

[0021] In some embodiments, the obtaining the energy dispatching condition based on the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation and determining the energy dispatching reference value specifically includes:

[0022] Judge whether PA*PB < 0 holds;

[0023] If PA*PB < 0 holds, then judge whether PA > 0 and PB < 0 hold:

[0024] When PA > 0 and PB < 0 hold, determine that the energy dispatching condition is to transfer from the B traction substation to the A traction substation, and set the energy dispatching reference value to min(PA, PB, P EDE );

[0025] Otherwise, determine that the energy dispatching condition is to transfer from the A traction substation to the B traction substation, and set the energy dispatching reference value to min(|PA|, |PB|, |P EDE |);

[0026] Among them, P EDE is the capacity of the energy dispatching device;

[0027] If PA*PB < 0 does not hold, then determine no-load standby and set the energy dispatching reference value to 0.

[0028] In some embodiments, determining the energy scheduling value by using the energy scheduling reference value includes:

[0029] Converting the energy scheduling parameter value into an energy scheduling value according to the scheduling system time, the scheduling system time received by the first communication network, and the scheduling system time received by the second communication network; wherein, the energy scheduling reference value includes the energy scheduling reference value of the first communication network, the energy scheduling reference value of the second communication network, or 0.

[0030] In some embodiments, converting the energy scheduling parameter value into an energy scheduling value according to the scheduling system time, the scheduling system time received by the first communication network, and the scheduling system time received by the second communication network specifically includes:

[0031] Judging whether the absolute differences between the scheduling system time and the scheduling system time received by the first communication network and the scheduling system time received by the second communication network are less than a preset second time synchronization threshold:

[0032] If the absolute difference between the scheduling system time and the scheduling system time received by the first communication network is less than the preset second time synchronization threshold, the energy scheduling value is the energy scheduling reference value of the first communication network;

[0033] If the absolute difference between the scheduling system time and the scheduling system time received by the second communication network is less than the preset second time synchronization threshold, the energy scheduling value is the energy scheduling reference value of the first communication network;

[0034] Otherwise, the energy scheduling value is 0.

[0035] On the other hand, the present disclosure provides a regenerative braking energy scheduling system for traction power supply, including a power acquisition unit respectively built in several power measurement and control cabinets, an energy scheduling management unit externally disposed between any two adjacent power measurement and control cabinets, and an energy scheduling device internally provided with an energy scheduling control unit;

[0036] Any adjacent power acquisition units are used to acquire the real-time power information of two corresponding adjacent traction substations; wherein, each traction substation corresponds to a power measurement and control cabinet;

[0037] The energy scheduling management unit is used to update the real-time power information of any two adjacent traction substations in real time, calculate an energy scheduling reference value based on the real-time updated real-time power information, and determine an energy scheduling value by using the energy scheduling reference value;

[0038] The energy scheduling control unit is used to complete the two-way energy transfer scheduling between any two adjacent traction substations based on the energy scheduling value.

[0039] In some embodiments, a GPS time synchronization device, a switch for the first communication network, and a switch for the second communication network are arranged in the electric energy measurement and control cabinet;

[0040] A GPS time synchronization device, a switch for the first communication network, and a switch for the second communication network are arranged in the energy scheduling device.

[0041] A method and system for regenerative braking energy scheduling of a traction power supply provided by the present disclosure. The method collects the real-time power information of any two adjacent traction substations, updates the real-time power information of any two adjacent traction substations in real time, calculates an energy scheduling reference value based on the real-time updated real-time power information, determines an energy scheduling value using the energy scheduling reference value, and completes the two-way energy transfer scheduling between any two adjacent traction substations based on the energy scheduling value. The present disclosure adopts a highly reliable communication network and a data consistency algorithm to ensure that when the energy scheduling device in the section post cannot utilize the locomotive regenerative braking energy in its own substation section, it is transferred to the adjacent substation section for use in traction trains.

[0042] Compared with the prior art, the technical solution of the present disclosure has the following technical innovation points:

[0043] 1) A redundant network communication topology is adopted to realize communication between devices. The first communication network and the second communication network are completely independent and do not affect each other. The failure of a single network communication node device does not affect the communication function of the braking energy scheduling network.

[0044] 2) Make full use of the redundant network communication and the GPS high-precision clock synchronization function to ensure that the data clocks of each node in the regenerative braking energy scheduling system are consistent, and reduce the risk of data errors and losses of each node. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In the following, the present disclosure will be described in more detail based on embodiments and with reference to the drawings:

[0046] Figure 1 It is a power supply schematic diagram of a railway traction power supply system provided by an embodiment of the present disclosure.

[0047] Figure 2 It is a topology diagram of a regenerative braking energy scheduling system provided by an embodiment of the present disclosure.

[0048] Figure 3 It is a flowchart of a regenerative braking energy scheduling method provided by an embodiment of the present disclosure.

[0049] Figure 4This is the communication topology diagram of the regenerative braking energy scheduling network provided by the embodiments of the present disclosure.

[0050] Figure 5 This is the schematic flowchart of the method for determining the regenerative braking energy scheduling value provided by the embodiments of the present disclosure.

[0051] In the accompanying drawings, the same components are denoted by the same reference numerals, and the drawings are not drawn to actual scale. Detailed implementation manners

[0052] In order to enable those skilled in the art of the present technology to better understand the technical solutions of the present disclosure, and to fully understand how the present disclosure uses technical means to solve technical problems and achieve the corresponding technical effects, and to implement accordingly, the following will combine the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The embodiments of the present disclosure and each feature in the embodiments can be combined with each other without conflict, and the formed technical solutions are all within the protection scope of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described here can be implemented in an order different from those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0054] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0055] The technical concept of the present disclosure is based on the rich regenerative braking energy of the railway power supply system and is applied to the railway traction power supply system, such as Figure 1The power supply schematic diagram of the railway traction power supply system shown is designed with a regenerative braking energy scheduling system to achieve the regenerative braking energy scheduling between two adjacent substations. Based on the "returned energy not counted" charging scheme for substation traction energy, a regenerative braking energy scheduling system is designed, such as Figure 2 The system topology diagram shown. This system includes a set of energy scheduling devices, two sets of power measurement and control cabinets, and a set of energy scheduling management platforms. Among them, the energy scheduling device is installed in the section post, the power measurement and control cabinet is installed in the adjacent substation, and the energy scheduling management platform is installed in the section post. The power measurement and control cabinet mainly collects the power information of the substation and transmits the power information to the energy scheduling management platform through a dedicated network between substations; the energy scheduling management platform receives the real-time power information of the substation through a dedicated network, identifies the energy scheduling working condition and the energy scheduling value, and sends the energy scheduling reference value to the energy scheduling device. The energy scheduling device uses the AC-DC-AC of the transformer and the connected converter to transfer and utilize the power between substations, realizing the efficient utilization of regenerative braking energy.

[0056] Example 1

[0057] Figure 3 The flowchart of a regenerative braking energy scheduling method for traction power supply provided by an embodiment of the present disclosure is shown, such as Figure 3 shown, a regenerative braking energy scheduling method for traction power supply includes:

[0058] S301, collecting the real-time power information of any two adjacent traction substations;

[0059] S302, updating the real-time power information of the any two adjacent traction substations in real time, calculating an energy scheduling reference value based on the real-time updated real-time power information, and determining an energy scheduling value using the energy scheduling reference value;

[0060] S303, completing the two-way energy transfer scheduling between the any two adjacent traction substations based on the energy scheduling value.

[0061] Compared with the prior art, the regenerative braking energy scheduling system adopted by the present disclosure realizes the regenerative braking energy scheduling between two adjacent substations in the section post energy scheduling device. By adopting a highly reliable communication network and a data consistency algorithm, it is ensured that the energy scheduling device in the section post transfers the locomotive regenerative braking energy to the adjacent substation section for use in traction trains when the regenerative braking energy cannot be utilized in the section of this substation.

[0062] It should be noted that, such as Figure 2As shown in the figure, the regenerative braking energy scheduling system involves an energy scheduling device, two sets of electric energy measurement and control cabinets, and an energy scheduling management platform. Each device is installed in a different area and the installation distances are relatively far. Building a highly reliable communication network is the core technology of the regenerative braking energy scheduling system.

[0063] Example 2

[0064] Based on the above embodiments, the real-time power information of any two adjacent traction substations includes the first communication network real-time power information P1 and the second communication network real-time power information P2 of substation A, and the first communication network real-time power information P3 and the second communication network real-time power information P4 of substation B; wherein, the first communication network and the second communication network are redundant to each other.

[0065] It should be noted that the present disclosure designs a regenerative braking energy scheduling system, which uses a redundant network communication topology to achieve communication between devices. Its network communication topology is as Figure 4 shown. The first communication network and the second communication network are completely independent and do not affect each other. The failure of a single network communication node device does not affect the braking energy scheduling network communication function. The substation electric energy measurement and control device combines the real-time power information of the substation with the control system time information of the electric energy measurement and control cabinet, and transmits it to the energy scheduling management platform through the first communication network and the second communication network at the same time. The energy scheduling management platform receives the real-time power information of the substation through the first communication network and the second communication network at the same time.

[0066] Example 3

[0067] Based on the above embodiments, as Figure 2 and Figure 3 shown, the real-time update of the real-time power information of any two adjacent traction substations includes: according to the scheduling system time, the first time information of the first communication network of substation A and the first time information of the second communication network of substation A, the real-time power information PA of substation A is updated in real time to P1 or P2 or 0, and at the same time, according to the scheduling system time, the first time information of the first communication network of substation B and the first time information of the second communication network of substation B, the real-time power information PB of substation B is updated in real time to P3 or P4 or 0.

[0068] Example 4

[0069] Based on the above embodiments, the real-time power information PA of the A traction substation is updated to P1 or P2 or 0 in real time according to the dispatching system time, the first time information of the first communication network of the A traction substation, and the first time information of the second communication network of the A traction substation. At the same time, the real-time power information PB of the B traction substation is updated to P3 or P4 or 0 in real time according to the dispatching system time, the first time information of the first communication network of the B traction substation, and the first time information of the second communication network of the B traction substation. Specifically, it includes:

[0070] Judge whether the absolute differences between the dispatching system time and the first time information of the first communication network of the A traction substation and the first time information of the second communication network of the A traction substation are less than a preset first time synchronization threshold:

[0071] If the absolute difference between the dispatching system time and the first time information of the first communication network of the A traction substation is less than the preset first time synchronization threshold, update the real-time power information PA of the A traction substation to P1;

[0072] If the absolute difference between the dispatching system time and the first time information of the second communication network of the A traction substation is less than the preset first time synchronization threshold, update the real-time power information PA of the A traction substation to P2;

[0073] Otherwise, update the real-time power information PA of the A traction substation to 0;

[0074] At the same time, judge whether the absolute differences between the dispatching system time and the first time information of the first communication network of the B traction substation and the first time information of the second communication network of the B traction substation are less than the preset first time synchronization threshold:

[0075] If the absolute difference between the dispatching system time and the first time information of the first communication network of the B traction substation is less than the preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P3;

[0076] If the absolute difference between the dispatching system time and the first time information of the second communication network of the B traction substation is less than the preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P4;

[0077] Otherwise, update the real-time power information PB of the B traction substation to 0.

[0078] It should be noted that the real-time power information of the substation is updated according to the above process, and the energy dispatching algorithm is executed to calculate the dispatching energy reference value of the energy dispatching device. One side of the energy dispatching device is connected to the traction power supply arm of substation A, and the other side is connected to the traction power supply arm of substation B. The regenerative braking energy generated by the locomotive during braking is dispatched to the contact network in the traction condition through the energy dispatching device, thereby improving the power flow characteristics of the traction network and allowing the regenerative braking energy in different power supply intervals to be integrated with each other.

[0079] Example 5

[0080] On the basis of the above embodiment, the energy scheduling reference value is calculated based on the real-time power information updated in real time, including:

[0081] The energy dispatching working condition is obtained and the energy dispatching reference value is determined according to the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation.

[0082] Example 6

[0083] On the basis of the above embodiment, the energy dispatching condition is obtained and the energy dispatching reference value is determined according to the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation, specifically including:

[0084] Determine whether PA*PB<0 is true;

[0085] If PA*PB<0 holds, then determine whether PA>0 and PB<0 hold:

[0086] When PA>0 and PB<0 are established, the energy dispatching condition is determined to be transferred from the B traction substation to the A traction substation, and the energy dispatching reference value is set to min(PA, PB, P EDE );

[0087] Otherwise, the energy dispatching condition is determined to be transferred from the A traction substation to the B traction substation, and the energy dispatching reference value is set to min(|PA,|PB|,|P EDE |);

[0088] Among them, P EDE The capacity of the device for energy scheduling;

[0089] If PA*PB<0 does not hold, it is determined to be in no-load standby mode, and the energy scheduling reference value is set to 0.

[0090] Specifically, the regenerative braking energy scheduling function is shown in Table 1, where PA refers to the real-time power of Substation A; PB refers to the real-time power of Substation B; and PEDE refers to the capacity of the energy scheduling device.

[0091] Table 1 Basic Functions of the Energy Scheduling Device in the Section Substation

[0092]

[0093]

[0094] Example 7

[0095] Based on the above embodiments, determining the energy scheduling value using the energy scheduling reference value includes: converting the energy scheduling parameter value into an energy scheduling value according to the scheduling system time, the scheduling system time received by the first communication network, and the scheduling system time received by the second communication network; where the energy scheduling reference value includes the energy scheduling reference value of the first communication network, the energy scheduling reference value of the second communication network, or 0.

[0096] Example 8

[0097] Based on the above embodiments, specifically, converting the energy scheduling parameter value into an energy scheduling value according to the scheduling system time, the scheduling system time received by the first communication network, and the scheduling system time received by the second communication network includes:

[0098] Judging whether the absolute differences between the scheduling system time and the scheduling system time received by the first communication network and the scheduling system time received by the second communication network are less than a preset second time synchronization threshold:

[0099] If the absolute difference between the scheduling system time and the scheduling system time received by the first communication network is less than the preset second time synchronization threshold, the energy scheduling value is the energy scheduling reference value of the first communication network;

[0100] If the absolute difference between the scheduling system time and the scheduling system time received by the second communication network is less than the preset second time synchronization threshold, the energy scheduling value is the energy scheduling reference value of the first communication network;

[0101] Otherwise, the energy scheduling value is 0.

[0102] It should be noted here that in combination with Figure 5 the flow chart of the energy scheduling value determination method shown, it can be seen that the method for determining the regenerative braking energy scheduling value includes the following steps:

[0103] Step 501: The real-time power and timestamp of Substation A are uploaded to the energy dispatching platform in real time through the first communication network and the second communication network.

[0104] Step 502: The real-time power and timestamp of Substation B are uploaded to the energy dispatching platform in real time through the first communication network and the second communication network.

[0105] Step 503: The energy dispatching management platform simultaneously receives the power and timestamp information of the traction substations from the first communication network and the second communication network. Based on the data consistency algorithm, it updates the power information of adjacent traction substations in real time, calculates the energy dispatching reference value based on the real-time updated real-time power information, and sends the energy dispatching reference value and timestamp information to the energy dispatching device in real time through the first communication network and the second communication network.

[0106] Step 504: The energy dispatching device simultaneously receives the energy dispatching reference value and timestamp information from the first communication network and the second communication network, and determines the energy dispatching value based on the data consistency algorithm.

[0107] Example 9

[0108] A regenerative braking energy dispatching system for a traction power supply provided by an embodiment of the present disclosure includes a power acquisition unit respectively built in several power measurement and control cabinets, an energy dispatching management unit externally disposed between any two adjacent power measurement and control cabinets, and an energy dispatching device internally provided with an energy dispatching control unit.

[0109] Any adjacent power acquisition units are used to acquire the real-time power information of two adjacent traction substations; wherein, each traction substation corresponds to a power measurement and control cabinet.

[0110] The energy dispatching management unit is used to update the real-time power information of any two adjacent traction substations in real time, calculate the energy dispatching reference value based on the real-time updated real-time power information, and determine the energy dispatching value using the energy dispatching reference value.

[0111] The energy dispatching control unit is used to complete the two-way energy transfer dispatching between any two adjacent traction substations based on the energy dispatching value.

[0112] Compared with the prior art, the regenerative braking energy dispatching system adopted by the present disclosure realizes the regenerative braking energy dispatching between two adjacent substations in the section post. By using a highly reliable communication network and a data consistency algorithm, it ensures that when the locomotive regenerative braking energy cannot be utilized in the section of the local substation, the energy dispatching device in the section post transfers the energy to the section of the adjacent substation for use in traction trains.

[0113] It should be noted that, such asFigure 2 As shown in the figure, the regenerative braking energy scheduling system involves an energy scheduling device, two sets of electric energy measurement and control cabinets, and an energy scheduling management platform. Each device is installed in a different area and the installation distance is relatively far. Building a highly reliable communication network is the core technology of the regenerative braking energy scheduling system.

[0114] The energy scheduling device is a device used to achieve controllable energy interaction in different power supply intervals, mainly composed of a matching transformer, an AC-DC-AC converter, a high-voltage switch cabinet, a control and protection device, etc.

[0115] The traction substation is a place used to convert the electric energy sent from the power plant through the power transmission line into the voltage suitable for locomotives and vehicles, and distribute it to the catenary or contact rail.

[0116] The section post is located at the power supply demarcation point between two adjacent traction substations and is an electrical facility used to divide the traction network into different power supply sections.

[0117] The traction network is the general term for the power supply network composed of feeder lines, catenaries, rails and the earth, and return lines.

[0118] The single-phase AC-DC-AC converter is composed of two single-phase H-bridge converters based on fully controlled power electronic devices connected in a common DC side to achieve AC-DC-AC power conversion.

[0119] On the basis of the above embodiments, a GPS time synchronization device, a switch of the first communication network, and a switch of the second communication network are arranged in the electric energy measurement and control cabinet;

[0120] A GPS time synchronization device, a switch of the first communication network, and a switch of the second communication network are arranged in the energy scheduling device.

[0121] It should be noted that, as Figure 4 shown, a GPS time synchronization device is configured in the electric energy measurement and control cabinet. The control system of the electric energy measurement and control cabinet communicates with the GPS time synchronization device through a switch to complete the time synchronization function. A GPS time synchronization device is configured in the energy scheduling device. The control system of the energy scheduling device and the energy management platform communicate with the GPS time synchronization device through a switch to complete the time synchronization function.

[0122] In summary, the present disclosure provides a method and system for regenerative braking energy scheduling in a traction power supply system. The method includes collecting real-time power information of any two adjacent traction substations; updating the real-time power information of the any two adjacent traction substations in real time, calculating an energy scheduling reference value based on the real-time updated real-time power information, and determining an energy scheduling value using the energy scheduling reference value; and completing two-way energy transfer scheduling between the any two adjacent traction substations based on the energy scheduling value. At the same time, a scheduling system based on the above scheduling method is disclosed, including a power acquisition unit respectively built in several power measurement and control cabinets, an energy scheduling management unit externally disposed between any two adjacent power measurement and control cabinets, and an energy scheduling device internally provided with an energy scheduling control unit.

[0123] Compared with the prior art, the technical solution of the present disclosure has the following beneficial technical effects:

[0124] (1) The regenerative braking energy scheduling system involves a set of energy scheduling devices, two sets of power measurement and control cabinets, and an energy scheduling management platform. Each device is installed in different areas and at a relatively long installation distance. A highly reliable communication network is built, and a redundant network communication topology is used to realize communication between devices. They are completely independent and do not affect each other. The failure of a single network communication node device does not affect the network communication function of the regenerative braking energy scheduling system.

[0125] (2) The regenerative braking energy scheduling system adopts a highly reliable communication network and a data consistency algorithm to ensure that the energy scheduling device in the section post transfers the locomotive regenerative braking energy to the adjacent substation section for use in traction trains when the regenerative braking energy cannot be utilized in the section of the current substation.

[0126] (3) The data synchronization method of the regenerative braking energy scheduling system makes full use of the redundant network communication and the GPS high-precision clock synchronization function to ensure that the data clocks of each node used in the regenerative braking energy scheduling system are consistent, reducing the risk of data errors and losses of each node.

[0127] In the embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above-mentioned module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0128] It should be noted that in the present disclosure, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, the element limited by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device including the element.

[0129] Although the disclosed embodiments of the present disclosure are as above, the above content is only an embodiment adopted for the convenience of understanding the present disclosure and is not intended to limit the present disclosure. Any person skilled in the art within the technical field to which the present disclosure pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present disclosure. However, the scope of patent protection of the present disclosure shall still be subject to the scope defined by the appended claims.

Claims

1. A method for scheduling the regenerative braking energy of traction power supply, characterized in that Including: Collecting the real-time power information of any two adjacent traction substations; Updating the real-time power information of any two adjacent traction substations in real time, calculating an energy scheduling reference value based on the real-time updated real-time power information, and determining an energy scheduling value by using the energy scheduling reference value; Completing the two-way energy transfer scheduling between any two adjacent traction substations based on the energy scheduling value.

2. The regenerative braking energy scheduling method for traction power supply according to claim 1, wherein The real-time power information of any two adjacent traction substations includes the first communication network real-time power information P1 and the second communication network real-time power information P2 of substation A, and the first communication network real-time power information P3 and the second communication network real-time power information P4 of substation B; wherein, the first communication network and the second communication network are redundant to each other.

3. The method for scheduling the regenerative braking energy of traction power supply according to claim 2, wherein The real-time updating of the real-time power information of any two adjacent traction substations includes: According to the dispatching system time, the first time information of the first communication network of substation A and the first time information of the second communication network of substation A, updating the real-time power information PA of substation A to P1 or P2 or 0 in real time, and at the same time, according to the dispatching system time, the first time information of the first communication network of substation B and the first time information of the second communication network of substation B, updating the real-time power information PB of substation B to P3 or P4 or 0.

4. The method for scheduling the regenerative braking energy of traction power supply according to claim 3, wherein The updating of the real-time power information PA of substation A to P1 or P2 or 0 according to the dispatching system time, the first time information of the first communication network of substation A and the first time information of the second communication network of substation A, and at the same time, the updating of the real-time power information PB of substation B to P3 or P4 or 0 according to the dispatching system time, the first time information of the first communication network of substation B and the first time information of the second communication network of substation B specifically includes: Judging whether the absolute differences between the dispatching system time and the first time information of the first communication network of substation A and the first time information of the second communication network of substation A are less than a preset first time synchronization threshold: If the absolute difference between the dispatching system time and the first time information of the first communication network of substation A is less than the preset first time synchronization threshold, updating the real-time power information PA of substation A to P1; If the absolute difference between the dispatching system time and the first time information of the second communication network of substation A is less than the preset first time synchronization threshold, updating the real-time power information PA of substation A to P2; Otherwise, updating the real-time power information PA of substation A to 0; At the same time, judging whether the absolute differences between the dispatching system time and the first time information of the first communication network of substation B and the first time information of the second communication network of substation B are less than the preset first time synchronization threshold: If the absolute difference between the dispatching system time and the first time information of the first communication network of the B traction substation is less than a preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P3; If the absolute difference between the dispatching system time and the first time information of the second communication network of the B traction substation is less than a preset first time synchronization threshold, update the real-time power information PB of the B traction substation to P4; Otherwise, update the real-time power information PB of the B traction substation to 0.

5. The regenerative braking energy scheduling method for traction power supply according to claim 2, characterized in that The calculation of the energy dispatching reference value based on the real-time updated real-time power information includes: Obtain the energy dispatching condition based on the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation and determine the energy dispatching reference value.

6. The regenerative braking energy scheduling method for traction power supply according to claim 5, characterized in that, The obtaining of the energy dispatching condition based on the real-time power information PA of the A traction substation and the real-time power information PB of the B traction substation and the determination of the energy dispatching reference value specifically include: Judge whether PA*PB < 0 holds; If PA*PB < 0 holds, then judge whether PA > 0 and PB < 0 hold: When PA > 0 and PB < 0 hold, it is determined that the energy dispatching condition is to transfer from the B traction substation to the A traction substation, and the energy dispatching reference value is set to min(PA, PB, P EDE ); Otherwise, determine that the energy scheduling condition is to transfer from the said A traction substation to the said B traction substation, and set the said energy scheduling reference value to min(|PA|, |PB|, |P EDE |); Among them, P EDE is the capacity of the energy scheduling device; If PA*PB < 0 does not hold, it is determined to be no-load standby, and the energy dispatching reference value is set to 0.

7. The method for dispatching the regenerative braking energy of the traction power supply according to claim 2, characterized in that, The determination of the energy dispatching value using the energy dispatching reference value includes: According to the dispatching system time, the dispatching system time received by the first communication network, and the dispatching system time received by the second communication network, convert the energy dispatching parameter value into an energy dispatching value; wherein, the energy dispatching reference value includes the energy dispatching reference value of the first communication network, the energy dispatching reference value of the second communication network, or 0.

8. The method for scheduling the regenerative braking energy of traction power supply according to claim 7, characterized in that The conversion of the energy dispatching parameter value into an energy dispatching value according to the dispatching system time, the dispatching system time received by the first communication network, and the dispatching system time received by the second communication network specifically includes: Judge whether the absolute differences between the dispatching system time and the dispatching system time received by the first communication network and the dispatching system time received by the second communication network are less than a preset second time synchronization threshold: If the absolute difference between the dispatching system time and the dispatching system time received by the first communication network is less than a preset second time synchronization threshold, the energy dispatching value is the energy dispatching reference value of the first communication network; If the absolute difference between the dispatching system time and the dispatching system time received by the second communication network is less than a preset second time synchronization threshold, the energy dispatching value is the energy dispatching reference value of the first communication network; Otherwise, the energy dispatching value is 0.

9. A regenerative braking energy scheduling system for traction power supply, characterized in that, It includes power acquisition units respectively built in several power measurement and control cabinets, an energy dispatching management unit externally placed between any two adjacent power measurement and control cabinets, and an energy dispatching device with an energy dispatching control unit installed therein; Any adjacent power acquisition units are used to collect the real-time power information of the corresponding two adjacent traction substations; wherein, each traction substation corresponds to a power measurement and control cabinet; The energy scheduling management unit is used to update the real-time power information of any two adjacent traction substations in real time, calculate an energy scheduling reference value based on the real-time updated real-time power information, and determine an energy scheduling value by using the energy scheduling reference value; The energy scheduling control unit is used to complete the two-way energy transfer scheduling between any two adjacent traction substations based on the energy scheduling value.

10. The regenerative braking energy dispatching system for traction power supply according to claim 9, wherein A GPS time synchronization device, a switch of the first communication network, and a switch of the second communication network are arranged in the electric energy measurement and control cabinet; A GPS time synchronization device, a switch of the first communication network, and a switch of the second communication network are arranged in the energy scheduling device.

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