A traction power supply regenerative braking energy scheduling method and system

Abstract

The present disclosure relates to a traction power supply regenerative braking energy scheduling method and system, the method comprising: 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 updated real-time power information, and determining an energy scheduling value using the energy scheduling reference value; and completing energy bidirectional transfer scheduling between the any two adjacent traction substations based on the energy scheduling value. The present disclosure uses a high-reliability communication network and a data consistency algorithm to ensure that, in the case that the energy scheduling device of a partition substation cannot utilize the locomotive regenerative braking energy in the substation section, the energy is transferred to an adjacent substation section for use by a traction train.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of locomotive traction, in particular to a traction power supply regenerative braking energy scheduling method and system. BACKGROUND

[0002] The main and auxiliary braking mode of the high-power AC electric locomotive of the electrified railway mainly uses regenerative braking and auxiliary air braking, and a large amount of regenerative braking energy is generated during braking. At present, the regenerative braking energy consumption modes mainly include utilization by the same arm traction train, consumption by the traction power supply equipment, and feedback to the power grid. However, the above modes have obvious shortcomings and cannot fully utilize the regenerative braking energy, mainly embodied in the following aspects: (1) Low utilization of regenerative braking energy, and much energy is fed back to the power grid. The same arm utilization mode is heavily dependent on the train operation diagram, and if the train density is small, the utilization rate of the regenerative braking energy of this mode will be greatly reduced. According to the estimation, 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 energy feedback economic benefit. As a primary load, the railway takes power from the power grid, and the power grid company charges for the positive power taking and adopts the policy of "returning positive charge" or "not charging" for the feedback of the regenerative braking energy. This part of energy fed back to the power grid will not bring any benefit to the railway power supply department, thereby causing huge economic losses to the railway department. (3) Poor energy feedback quality. The traction power supply system is single-phase, and if the regenerative braking energy is directly fed back to the three-phase power system, it will generate serious negative sequence current at the grid side, resulting in unbalance of the 110kV or 220kV three-phase power grid and reducing the transformer capacity utilization rate. Especially in the heavy-load (ten-thousand-ton) heavy-haul railway with high density, the above problems will be more prominent. SUMMARY

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

[0004] In one aspect, the present disclosure provides a traction power supply regenerative braking energy scheduling method, comprising:

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

[0006] Real-time updating the real-time power information of the any two adjacent traction substations, 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 energy bidirectional 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 the any two adjacent traction substations includes first communication network real-time power information P1 and second communication network real-time power information P2 of the A traction substation, and first communication network real-time power information P3 and second communication network real-time power information P4 of the B traction substation; 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 the any two adjacent traction substations includes: according to the dispatching system time, the first communication network first time information of the A traction substation, and the second communication network first time information of the A traction substation, updating the real-time power information PA of the A traction substation to P1 or P2 or 0, and according to the dispatching system time, the first communication network first time information of the B traction substation, and the second communication network first time information of the B traction substation, updating the real-time power information PB of the B traction substation to P3 or P4 or 0.

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

[0011] judging whether the absolute difference between the dispatching system time and the first communication network first time information of the A traction substation and the second communication network first time information of the A traction substation is less than a preset first time synchronization threshold value:

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

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

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

[0015] Meanwhile, it is judged whether an absolute difference between the dispatching system time and first time information of a first communication network of the B traction substation and an absolute difference between the dispatching system time and first time information of a second communication network of the B traction substation are less than a preset first time synchronization threshold value:

[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 value, the real-time power information PB of the B traction substation is updated as 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 value, the real-time power information PB of the B traction substation is updated as P4;

[0018] Otherwise, the real-time power information PB of the B traction substation is updated as 0.

[0019] In some embodiments, the real-time power information is calculated to obtain an energy scheduling reference value based on the real-time update, comprising:

[0020] An energy scheduling condition is obtained and an energy scheduling 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.

[0021] In some embodiments, the energy scheduling condition is obtained and the energy scheduling 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 comprising:

[0022] It is judged whether PA*PB<0 is true;

[0023] If PA*PB<0 is true, it is judged whether PA>0 and PB<0 are true:

[0024] When PA>0 and PB<0 are true, it is determined that the energy scheduling condition is to transfer from the B traction substation to the A traction substation, and the energy scheduling reference value is set as min(PA, PB, P EDE );

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

[0026] Wherein, P EDE is the capacity of the energy scheduling device;

[0027] If PA*PB<0 is not true, it is determined that the standby is in an empty load state, and the energy scheduling reference value is set as 0.

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

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

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

[0031] determining whether 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 value:

[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 value, the energy scheduling value is an 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 value, the energy scheduling value is an energy scheduling reference value of the first communication network;

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

[0035] In another aspect, the present disclosure provides a regenerative braking energy scheduling system for traction power supply, comprising power collection units respectively built in a plurality of electric energy control cabinets, and energy scheduling management units externally arranged between any two adjacent electric energy control cabinets, and an energy scheduling device internally provided with an energy scheduling control unit;

[0036] any adjacent power collection unit is configured to collect real-time power information of corresponding two adjacent traction substations; wherein each traction substation corresponds to an electric energy control cabinet;

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

[0038] The energy scheduling control unit is configured to complete the bidirectional energy transfer scheduling between the two adjacent traction substations based on the energy scheduling value.

[0039] In some embodiments, the electric energy measurement and control cabinet is provided with a GPS time setting device, a switch of a first communication network and a switch of a second communication network.

[0040] The energy scheduling device is provided with a GPS time setting device, a switch of a first communication network and a switch of a second communication network.

[0041] The present disclosure provides a traction power supply regenerative braking energy scheduling method and system. The method collects real-time power information of any two adjacent traction substations, updates the real-time power information of the two adjacent traction substations in real time, calculates an energy scheduling reference value based on the updated real-time power information, determines an energy scheduling value using the energy scheduling reference value, and completes bidirectional energy transfer scheduling between the two adjacent traction substations based on the energy scheduling value. The present disclosure uses a high-reliability communication network and a data consistency algorithm to ensure that, in the case where the energy scheduling device of a partition substation cannot utilize the regenerative braking energy of a locomotive in the substation section, the regenerative braking energy is transferred to an adjacent substation section for use by a traction train.

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

[0043] 1) A redundant network communication topology is used 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 braking energy scheduling network communication function.

[0044] 2) The redundant network communication and GPS high-precision clock synchronization function are fully utilized to ensure that the data clocks of each node in the regenerative braking energy scheduling system are consistent, reducing the risk of data errors and loss of each node. BRIEF DESCRIPTION OF DRAWINGS

[0045] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

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

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

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

[0049] Figure 4A regenerative braking energy scheduling network communication topology diagram provided by an embodiment of the present disclosure.

[0050] Figure 5 A flowchart of a regenerative braking energy scheduling value determination method provided by an embodiment of the present disclosure.

[0051] In the drawings, the same components are designated by the same reference numerals, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, and to understand the implementation process of how the present disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all the embodiments. The embodiments of the present disclosure and various features in the embodiments can be combined with each other without conflict, and the technical solutions formed thereby are all within the protection scope of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor should be within the protection scope of the present disclosure.

[0053] It should be noted that the terms "first", "second", and the like in the specification and claims of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are 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 drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[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 is shown, a regenerative braking energy scheduling system is designed, and regenerative braking energy scheduling between adjacent substations is realized. Figure 2 The system topology diagram is shown. The system includes a set of energy scheduling devices, two sets of electric energy measurement and control cabinets, and a set of energy scheduling management platform. Among them, the energy scheduling device is installed in the substation, the electric energy measurement and control cabinet is installed in the adjacent substation, and the energy scheduling management platform is installed in the substation. The electric energy measurement and control cabinet mainly collects power information of the substation, and transmits power information to the energy scheduling management platform through the special network between substations; the energy scheduling management platform receives real-time power information of the substation through the special network, identifies energy scheduling conditions and energy scheduling values, and sends energy scheduling reference values to the energy scheduling device. The energy scheduling device uses the AC-DC-AC of the transformer and the connected converter to realize power transfer between substations, and realizes efficient use of regenerative braking energy.

[0056] Example One

[0057] Figure 3 The flow chart of the regenerative braking energy scheduling method of the traction power supply provided by the embodiment of the present disclosure is shown in Figure 3 The regenerative braking energy scheduling method of the traction power supply includes:

[0058] S301, collecting 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 power information updated in real time, and determining an energy scheduling value by using the energy scheduling reference value;

[0060] S303, completing energy bidirectional 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 regenerative braking energy scheduling between adjacent two substations in the substation energy scheduling device, adopts a high-reliability communication network and a data consistency algorithm, and guarantees that in the case that the locomotive regenerative braking energy cannot be used in the substation section, the energy scheduling device in the substation transfers the energy to the adjacent substation section for use by the traction train.

[0062] It should be noted that, as Figure 2As shown, the regenerative braking energy scheduling system involves a set of energy scheduling devices, two sets of electric energy measurement and control cabinets, and a set of energy scheduling management platform. Each device is installed in different areas and has a long installation distance. A high-reliability communication network is built as the core technology of the regenerative braking energy scheduling system.

[0063] Example Two

[0064] On the basis of the above embodiment, the real-time power information of the arbitrary 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 the A traction substation, and the first communication network real-time power information P3 and the second communication network real-time power information P4 of the B traction substation; 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, adopts a redundant network communication topology to realize communication between devices, and the network communication topology is as shown in Figure 4 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 real-time power information of the substation is transmitted to the energy scheduling management platform through the first communication network and the second communication network by the substation electric energy measurement and control device in cooperation with the electric energy measurement and control cabinet control system time information. The energy scheduling management platform simultaneously accepts the real-time power information of the substation through the first communication network and the second communication network.

[0066] Example Three

[0067] On the basis of the above embodiment, as shown in Figure 2 and Figure 3 The real-time power information of the arbitrary two adjacent traction substations is updated in real time, including: according to the scheduling system time, the first communication network first time information of the A traction substation and the second communication network first time information of the A traction substation, the real-time power information PA of the A traction substation is updated to P1 or P2 or 0, and simultaneously according to the scheduling system time, the first communication network first time information of the B traction substation and the second communication network first time information of the B traction substation, the real-time power information PB of the B traction substation is updated to P3 or P4 or 0.

[0068] Example Four

[0069] On the basis of the above-mentioned embodiments, the real-time power information PA of the A traction substation is updated to P1 or P2 or 0 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, and the real-time power information PB of the B traction substation is updated to P3 or P4 or 0 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, and the specific steps include:

[0070] determining whether the absolute difference 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 is less than a preset first time synchronization threshold value:

[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 value, the real-time power information PA of the A traction substation is updated 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 value, the real-time power information PA of the A traction substation is updated to P2;

[0073] otherwise, the real-time power information PA of the A traction substation is updated to 0;

[0074] At the same time, it is determined whether the absolute difference 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 is less than a preset first time synchronization threshold value:

[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 value, the real-time power information PB of the B traction substation is updated 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 value, the real-time power information PB of the B traction substation is updated to P4;

[0077] otherwise, the real-time power information PB of the B traction substation is updated 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 scheduling algorithm is executed to calculate the energy scheduling device scheduling energy reference value. The energy scheduling device is connected with the traction power supply arm of substation A on one side and connected with the traction power supply arm of substation B on the other side. The regenerative braking energy generated when the locomotive brakes is scheduled to the catenary in traction working condition through the energy scheduling device, so as to improve the power flow characteristics of the traction network, and make the regenerative braking energy of different power supply intervals be able to be integrated.

[0079] Example Five

[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, and the energy scheduling reference value is calculated based on the real-time power information updated in real time.

[0081] The energy scheduling condition is obtained 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, and the energy scheduling reference value is determined.

[0082] Example Six

[0083] On the basis of the above embodiment, the energy scheduling condition is obtained 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, and the energy scheduling reference value is determined. Specifically, the energy scheduling condition is obtained 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, and the energy scheduling reference value is determined.

[0084] It is judged whether PA*PB<0 is established or not.

[0085] If PA*PB<0 is established, it is judged whether PA>0 and PB<0 are established or not.

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

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

[0088] Wherein, P EDE is the capacity of the energy scheduling device.

[0089] If PA*PB<0 is not established, it is determined that the empty load standby is established, and the energy scheduling reference value is set to 0.

[0090] It is particularly pointed out that the regenerative braking energy scheduling function is shown in Table 1, wherein PA refers to the real-time power of substation A; PB refers to the real-time power of substation B; and PDE refers to the capacity of the energy scheduling device.

[0091] Table 1 Basic functions of substation energy scheduling device

[0092]

[0093]

[0094] Example Seven

[0095] On the basis of the above-mentioned embodiments, the determining the energy scheduling value by using the energy scheduling reference value comprises: converting the energy scheduling parameter value into the 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 comprises the energy scheduling reference value of the first communication network, the energy scheduling reference value of the second communication network, or 0.

[0096] Example Eight

[0097] On the basis of the above-mentioned embodiments, the converting the energy scheduling parameter value into the 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 comprises:

[0098] judging whether the absolute difference 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 is less than a preset second time synchronization threshold value:

[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 value, 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 value, 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 that the energy scheduling value determination method shown in Figure 5 The flowchart of the energy scheduling value determination method shown in FIG. 7 shows that the determination method of the regenerative braking energy scheduling value comprises the following steps:

[0103] Step 501, the real-time power and time stamp of the A substation is uploaded to the energy scheduling platform in real time through the first communication network and the second communication network;

[0104] Step 502, the real-time power and time stamp of the B substation is uploaded to the energy scheduling platform in real time through the first communication network and the second communication network;

[0105] Step 503, the energy scheduling management platform simultaneously receives the traction substation power and time stamp information of the first communication network and the second communication network, updates the adjacent traction substation power information in real time based on the data consistency algorithm, calculates the energy scheduling reference value based on the real-time power information, and sends the energy scheduling reference value and time stamp information to the energy scheduling device through the first communication network and the second communication network in real time;

[0106] Step 504, the energy scheduling device simultaneously receives the energy scheduling reference value and time stamp information of the first communication network and the second communication network, and determines the energy scheduling value based on the data consistency algorithm.

[0107] Example Nine

[0108] The traction power supply regenerative braking energy scheduling system provided by the embodiment of the present disclosure comprises power collection units respectively built in a plurality of electric energy measurement and control cabinets, and an energy scheduling management unit externally arranged between any two adjacent electric energy measurement and control cabinets and an energy scheduling device internally provided with an energy scheduling control unit;

[0109] Any adjacent power collection unit is used to collect real-time power information of the corresponding two adjacent traction substations; wherein each traction substation corresponds to an electric energy measurement and control cabinet;

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

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

[0112] Compared with the prior art, the regenerative braking energy scheduling system adopted by the present disclosure realizes the regenerative braking energy scheduling between the adjacent two substations in the substation, adopts a high-reliability communication network and a data consistency algorithm, and guarantees that the energy scheduling device in the substation transfers the locomotive regenerative braking energy to the adjacent substation section for use by the traction train in the case that the locomotive regenerative braking energy cannot be used in the substation section.

[0113] It should be noted that, asFigure 2 As shown, the regenerative braking energy scheduling system relates to a set of energy scheduling devices, two sets of electric energy measurement and control cabinets, and a set of energy scheduling management platforms.

[0114] The energy scheduling device is a device for realizing controllable energy interaction between different power supply intervals, mainly composed of matching transformers, AC-DC-AC converters, high-voltage switch cabinets, control and protection devices, etc.

[0115] The traction substation is used to transform the electric energy sent by the power plant through the power transmission line into the voltage suitable for the locomotive vehicle, and distribute it to the place where the catenary or contact rail is located.

[0116] The partition substation is an electrical facility arranged at the power supply boundary between two adjacent traction substations, used to divide the traction network into different power supply partitions.

[0117] The traction network is a general term for the power supply network composed of feeder lines, catenary, tracks, ground, and return lines.

[0118] The single-phase AC-DC-AC converter is connected by two single-phase H-bridge converters based on full-controlled power electronic devices at the common DC side, realizing AC-DC-AC power conversion.

[0119] On the basis of the above embodiments, a GPS time-setting 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-setting 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 shown, Figure 4 The electric energy measurement and control cabinet is configured with a GPS time-setting device, and the electric energy measurement and control cabinet control system communicates with the GPS time-setting device through the switch to complete the time-setting function. The energy scheduling device is configured with a GPS time-setting device, and the energy scheduling device control system communicates with the energy management platform through the switch and the GPS time-setting device to complete the time-setting function.

[0122] In summary, the present disclosure provides a traction power supply regenerative braking energy scheduling method and system, which comprises 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 energy bidirectional transfer scheduling between the any two adjacent traction substations based on the energy scheduling value. The scheduling system based on the above scheduling method is also disclosed, which comprises power collection units respectively built in a plurality of electric energy measurement and control cabinets, and an energy scheduling management unit externally arranged between any two adjacent electric energy 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 scheme 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 electric energy measurement and control cabinets, and a set of energy scheduling management platform. Each device is installed in different areas and has a long installation distance. A high-reliability communication network is built, and a redundant network communication topology is used to realize communication between devices. The devices 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 uses a high-reliability communication network and a data consistency algorithm to ensure that in the case where the energy scheduling device in the partition substation cannot utilize the locomotive regenerative braking energy in the substation section, the energy is transferred to the adjacent substation section for use by the traction train.

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

[0127] In the embodiments provided by the present disclosure, it should be understood that the disclosed apparatus and method can also be implemented in other manners. The embodiments described above are merely exemplary for describing the present disclosure. For example, the flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operation of the apparatus, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts and block diagrams can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logic function. It should also be noted that, in some alternative implementations, the functions noted in the blocks can occur in a different order from that noted in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system for implementing 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 terms "comprising", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element limited by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0129] Although the embodiments disclosed by the present disclosure are as described above, the above description is only for the purpose of facilitating the understanding of the present disclosure, and is not intended to limit the present disclosure. Any person skilled in the art without departing from the spirit and scope of the present disclosure can make any modification and change in the implementation form and details, but the patent protection scope of the present disclosure shall be subject to the scope defined by the appended claims.

Claims

1. A method for scheduling regenerative braking energy in traction power supply, characterized in that, include: Real-time power information of any two adjacent traction substations is collected. The real-time power information of any two adjacent traction substations includes the real-time power information P1 of the first communication network and the real-time power information P2 of the second communication network of traction substation A, and the real-time power information P3 of the first communication network and the real-time power information P4 of the second communication network of traction substation B; wherein the first communication network and the second communication network are redundant to each other. The real-time power information of any two adjacent traction substations is updated in real time. Based on the real-time updated power information, an energy dispatch reference value is calculated, and the energy dispatch reference value is used to determine the energy dispatch value. Based on the energy scheduling value, complete the bidirectional energy transfer scheduling between any two adjacent traction substations; The real-time update of the real-time power information of any two adjacent traction substations includes: determining whether the absolute difference between the scheduling 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 is less than a preset first time synchronization threshold: if the absolute difference between the scheduling 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 the real-time power information PA of traction substation A is updated to P1; if the absolute difference between the scheduling 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 the real-time power information PA of traction substation A is updated to P2; otherwise, the real-time power information PA of traction substation A is updated to P2. The real-time power information PA is updated to 0. Simultaneously, it is determined whether the absolute difference between the scheduling 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 is less than a preset first time synchronization threshold. If the absolute difference between the scheduling 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, the real-time power information PB of the B traction substation is updated to P3. If the absolute difference between the scheduling 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, the real-time power information PB of the B traction substation is updated to P4. Otherwise, the real-time power information PB of the B traction substation is updated to 0.

2. The method for regenerative braking energy dispatching for traction power supply according to claim 1, characterized in that, The energy dispatch reference value is calculated based on the real-time updated power information, including: Based on the real-time power information PA of traction substation A and the real-time power information PB of traction substation B, the energy dispatching conditions are obtained and the energy dispatching reference value is determined.

3. The method for regenerative braking energy dispatching for traction power supply according to claim 2, characterized in that, The process of obtaining the energy dispatching conditions and determining the energy dispatching reference value based on the real-time power information PA of traction substation A and the real-time power information PB of traction substation B specifically includes: Determine whether PA*PB<0 is true; If PA*PB<0 is true, then determine whether PA>0 and PB<0 are true: If PA > 0 and PB < 0, then the energy dispatching condition is determined to be a transfer from traction substation B to traction substation A, and the energy dispatching reference value is set to [value missing]. ; Otherwise, the energy dispatching condition is determined to be a transfer from traction substation A to traction substation B, and the energy dispatching reference value is set to... ; in, For the capacity of the energy dispatching device; If PA*PB<0 is not true, then the system is determined to be in idle standby mode, and the energy scheduling reference value is set to 0.

4. The method for regenerative braking energy dispatching for traction power supply according to claim 1, characterized in that, The process of determining the energy dispatch value using the energy dispatch reference value includes: Based on 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, the energy scheduling parameter value is converted into an energy scheduling value; 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.

5. The method for regenerative braking energy dispatching for traction power supply according to claim 4, characterized in that, The step of converting the energy scheduling parameter value into an energy scheduling value based on 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: Determine whether the absolute difference 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 is less than a preset second time synchronization threshold: If the absolute difference between the scheduling system time and the scheduling system time received by the first communication network is less than a preset second time synchronization threshold, then the energy scheduling value is the energy scheduling reference value of the first communication network. If the absolute difference between the scheduling system time and the scheduling system time received by the second communication network is less than a preset second time synchronization threshold, then the energy scheduling value is the energy scheduling reference value of the first communication network. Otherwise, the energy scheduling value is 0.

6. A traction power supply regenerative braking energy dispatching system, characterized in that, The method for regenerative braking energy dispatching for traction power supply as described in any one of claims 1-5 includes power acquisition units that are built into several power measurement and control cabinets, an energy dispatching management unit that is externally placed between any two adjacent power measurement and control cabinets, and an energy dispatching device that has an internal energy dispatching control unit. Any adjacent power acquisition units are used to acquire real-time power information of two adjacent traction substations; wherein each traction substation corresponds to one power measurement and control cabinet. The energy dispatch management unit is used to update the real-time power information of any two adjacent traction substations in real time, calculate the energy dispatch reference value based on the real-time updated real-time power information, and determine the energy dispatch value using the energy dispatch reference value. The energy dispatch control unit is used to complete the bidirectional energy transfer dispatch between any two adjacent traction substations based on the energy dispatch value.

7. The regenerative braking energy dispatching system for traction power supply according to claim 6, characterized in that, The power measurement and control cabinet is equipped with a GPS time synchronization device, a switch for the first communication network, and a switch for the second communication network. The energy dispatching device is equipped with a GPS time synchronization device, a switch for the first communication network, and a switch for the second communication network.

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