Regenerative braking energy storage coordinated control method and system

Abstract

The present invention discloses a coordinated control method for regenerative braking energy storage, comprising: obtaining a coordinated control request for a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled; judging the capacitance state of a regenerative braking energy capacitor storage device in a traction station adjacent to the traction station to be coordinated and controlled, and providing power support to the traction station to be coordinated and controlled according to the capacitance storage state. In the present invention, when a regenerative braking energy capacitor storage device of a station exits operation or reaches a maximum absorbed power due to a fault or maintenance, the control system of the capacitor storage device of the station transmits the information of the device exiting or being at full power to the capacitor storage device of an adjacent station through an inter-station communication optical fiber, so as to provide power support, stabilize the DC network voltage to the maximum extent, and reduce the probability of starting the vehicle-mounted resistor and brake shoe.

Description

Technical Field

[0001] The present invention belongs to the technical field of regenerative braking, and in particular relates to a method and system for coordinated control of regenerative braking energy storage. Background Art

[0002] During the operation of urban rail transit, due to its heavy weight and high speed, frequent braking will generate a large amount of braking energy. If this part of the braking energy is not absorbed and utilized, it will cause the DC contact network voltage to rise rapidly, threatening the safety of rail transit operation. At present, most urban rail transit at home and abroad consume braking energy by installing resistor absorption devices. This solution converts braking energy into heat energy and consumes it, and the energy is not effectively utilized. The braking energy capacitor energy storage device uses the converter to increase or reduce the DC voltage to a controllable range in a chopping manner and stores it in a supercapacitor, so that the excess braking energy is absorbed when the train brakes to avoid the increase of the DC contact network voltage, and the braking energy is released when the train starts to power the train. The braking energy capacitor energy storage device has a good voltage stabilization performance for the traction network, and will be more widely used with the upgrading of supercapacitor technology materials.

[0003] In the actual operation lines of urban rail transit, since the braking energy is affected by parameters such as vehicle speed, passenger capacity, and vehicle density, different traction stations can absorb different braking energies. However, in actual engineering designs, most of them are equipped with capacitor energy storage devices of the same capacity. As a result, the power output of devices in different traction stations is unbalanced and uncoordinated, that is, the capacity of some devices is insufficient to absorb the braking energy, while some devices still have residual capacity. On the other hand, since the energy storage element used in the braking energy capacitor energy storage device is a supercapacitor (double-layer capacitor), if the braking energy is only obtained through simulation during the design stage and the equipment capacity is configured accordingly, the capacity redundancy is large. In addition, if the up and down trains enter the station at the same time or the equipment at a station is out of operation due to failure or maintenance, the equipment configuration cost will be higher.

[0004] Therefore, improving the absorption efficiency of the regenerative braking energy capacitor storage device of the entire line and reducing the equipment configuration cost have become urgent issues that need to be addressed. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a regenerative braking energy storage coordinated control method, which can improve the absorption efficiency of the regenerative braking energy capacitor storage device.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] In a first aspect, a method for coordinated control of regenerative braking energy storage includes:

[0008] Obtaining a coordinated control request for a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled;

[0009] The capacitance state of the regenerative braking energy capacitor energy storage device in the traction station adjacent to the traction station to be coordinated and controlled is determined, and power support is provided to the traction station to be coordinated and controlled according to the capacitance energy storage state.

[0010] In combination with the first aspect, further, the triggering condition of the coordinated control request of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled is when any of the following conditions is met:

[0011] The capacitor voltage of the regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled reaches its upper limit value, and the DC traction network voltage continues to rise;

[0012] The regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled has been taken out of operation due to failure or maintenance.

[0013] In combination with the first aspect, further, providing power support to the traction station to be coordinated and controlled according to the capacitance state of the regenerative braking energy capacitor storage device in the adjacent traction station includes:

[0014] Step 1: determine whether the capacitor voltage of the regenerative braking energy capacitor storage device in the traction station adjacent to the traction station to be coordinated and controlled is less than the adjustment capacity threshold. If so, use the adjacent traction station as the adjustment station and execute step 2; otherwise, execute step 3;

[0015] Step 2: Lower the start threshold of the regenerative braking energy capacitor storage device in the regulating station by V1, and proceed to step 4;

[0016] Step 3: determine whether the capacitor voltage of the internal regenerative braking energy capacitor storage device of the next traction station adjacent to the adjacent traction station is less than the adjustment capacity threshold; if so, use the traction station as the adjustment station and execute step 2; otherwise, execute step 1;

[0017] Step 4: Determine whether the coordinated control request instruction of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled disappears. If it disappears, restore the starting threshold of the regenerative braking energy capacitor energy storage device in each regulating station and exit the coordinated control. If it does not disappear, re-execute step 1.

[0018] In combination with the first aspect, further, the step 2 is executed more than 3 times.

[0019] In combination with the first aspect, further, the start threshold is reduced by V1=20.

[0020] In a second aspect, a regenerative braking energy storage coordinated control system is provided, comprising:

[0021] A control request acquisition module, used to acquire a coordinated control request of a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled;

[0022] The coordination control module is used to determine the capacitance state of the regenerative braking energy capacitor storage device in the traction station adjacent to the traction station to be coordinated and controlled, and provide power support to the traction station to be coordinated and controlled according to its capacitance storage state.

[0023] In a third aspect, a regenerative braking energy storage coordination control system is also provided, comprising: a memory and a processor;

[0024] The memory is used to store instructions;

[0025] The processor is used to operate according to the instructions to execute the steps of the method according to any one of the first aspects.

[0026] The beneficial effects of the present invention include: when a station's regenerative braking energy capacitor energy storage device exits operation or reaches the maximum absorption power due to a fault or maintenance, the control system of the station's capacitor energy storage device transmits the device exit or full power information to the capacitor energy storage device of the adjacent station through the inter-station communication optical fiber to provide power support, maximize the stability of the DC network voltage, and reduce the probability of starting the on-board resistor and brake shoe.

[0027] The Goose communication protocol is used between the comprehensive protection devices, and each control system is peer-to-peer control. There is no need to configure a central processor. Only the switching quantity is transmitted, which can achieve ms-level communication and greatly improve the response speed of coordinated control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the coordinated control method of regenerative braking energy storage of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the regenerative braking energy storage coordinated control system in the present invention. DETAILED DESCRIPTION

[0030] In order to further describe the technical features and effects of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] In order to implement the regenerative braking energy storage coordinated control method of the present invention, a regenerative braking energy capacitor storage device, a comprehensive protection device and a switch are provided at each traction station. The traction stations are connected to each other through the switch to form a ring network or a chain network. The connection between the traction stations adopts the Goose communication protocol, and only the switching quantity is transmitted, which can achieve ms-level communication. The control of the regenerative braking energy capacitor storage device between the traction stations is a peer-to-peer control relationship, without the distinction between master and slave.

[0032] like Figure 1-2 As shown, a regenerative braking energy storage coordinated control method is provided, comprising the following steps:

[0033] Step 1: obtaining a coordinated control request of a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled;

[0034] It is determined whether the regenerative braking energy capacitor storage device in the Kth (any one) traction station has issued a coordinated control request. If a request is issued, it needs to be coordinated controlled.

[0035] The triggering conditions for issuing coordinated control include:

[0036] The first trigger condition is that the capacitor voltage V of the regenerative braking energy storage device in the Kth traction station reaches V max , and the DC traction grid voltage VDC continues to rise;

[0037] Specifically:

[0038] The capacitor voltage V and the DC traction grid voltage V DC After being sampled and filtered by the sampling board, it is transmitted to the main control board.

[0039] The main control board will add the capacitor voltage V and the capacitor voltage upper limit setting value V in the logic operation max Compare and judge V within 3 sampling cycles at the same time DC Whether it exceeds the control target value.

[0040] The second trigger condition is that the regenerative braking energy capacitor storage device in the Kth traction station is out of operation due to failure or maintenance.

[0041] When any trigger condition is met, the control system of the regenerative braking energy capacitor storage device in the Kth traction station sends a signal.

[0042] Step 2: Provide power support to the traction station to be coordinated and controlled according to the capacitance state of the regenerative braking energy capacitor storage device in the adjacent traction station.

[0043] The specific steps include:

[0044] Step 21, determine whether the capacitor voltage of the regenerative braking energy capacitor storage device in the K+1 and K-1 traction stations adjacent to the traction station to be coordinated and controlled is less than the adjustment capacity threshold V0. If it is less than, the adjacent traction station is used as the adjustment station and step 22 is executed. Otherwise, step 23 is executed. K-1 and K+1 represent the previous and next adjacent traction stations respectively. If it is a chain structure, there may be only the previous one or only the next one. V0 is lower than the upper limit value V of the capacitor voltage absorption. maxThe value should be set according to the energy storage capacity of the capacitor. It cannot be set too high and a certain voltage margin should be left. It cannot be set too low either, otherwise it will not be able to accurately respond to the coordinated control request.

[0045] Step 22: adjust the starting threshold V of the regenerative braking energy capacitor storage device in the station in Reduce 20V (experience value), delay t1, and go to step 24; this step cannot be executed more than 3 times.

[0046] Among them, V in is the starting threshold of the regenerative braking energy capacitor energy storage device for the DC contact network voltage increase. Taking the 750V DC system as an example, the charging starting threshold V in When it is set to 850V (change according to actual conditions), when the DC contact network voltage rises to 850V, the equipment starts and absorbs braking energy.

[0047] The t1 value is set to give the device that responds to the coordination command a certain amount of action time to avoid calculation disorder in the control system. The time setting here should be in ms level and is set based on experience.

[0048] Step 23, determine whether the capacitor voltage of the internal regenerative braking energy capacitor storage device of the next traction station (K-2 and K+2) adjacent to the adjacent traction station is less than the adjustment capacity threshold V0. If so, use the traction station as the adjustment station and execute step 22; otherwise, execute step 21.

[0049] Step 24, determine whether the coordinated control request instruction of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled disappears. If it disappears, restore the starting threshold of the regenerative braking energy capacitor energy storage device in each regulating station and exit the coordinated control. If it does not disappear, re-execute step 21.

[0050] The present invention also provides a regenerative braking energy storage coordinated control system, comprising:

[0051] A control request acquisition module, used to acquire a coordinated control request of a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled;

[0052] The coordination control module is used to determine the capacitance state of the regenerative braking energy capacitor storage device in the traction station adjacent to the traction station to be coordinated and controlled, and provide power support to the traction station to be coordinated and controlled according to its capacitance storage state.

[0053] The present invention also provides a regenerative braking energy storage coordinated control system, comprising: a memory and a processor;

[0054] The memory is used to store instructions;

[0055] The processor is used to operate according to the instructions to execute the steps of the aforementioned regenerative braking energy storage coordinated control method of the present invention.

[0056] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0057] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for coordinated control of regenerative braking energy storage, characterized in that: include: Obtaining a coordinated control request for a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled; Determine the capacitance state of the regenerative braking energy capacitor energy storage device in the traction station adjacent to the traction station to be coordinated and controlled, and provide power support to the traction station to be coordinated and controlled according to the capacitance energy storage state; The triggering condition of the coordinated control request of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled is when any of the following conditions is met: The capacitor voltage of the regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled reaches its upper limit value, and the DC traction network voltage continues to rise; The regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled is out of operation due to failure or maintenance; The power support for the traction station to be coordinated and controlled is provided according to the capacitance state of the regenerative braking energy capacitor storage device in the adjacent traction station, including: Step 1: determine whether the capacitor voltage of the regenerative braking energy capacitor energy storage device in the traction station adjacent to the traction station to be coordinated and controlled is less than the adjustment capacity threshold. If so, the adjacent traction station is used as the adjustment station and step 2 is executed; otherwise, step 3 is executed, wherein the adjustment capacity threshold is set according to the capacitor energy storage quantity, which is lower than the capacitor voltage absorption upper limit value, so that the capacitor voltage of the regenerative braking energy capacitor energy storage device in the adjustment station has a margin, and the regenerative braking energy capacitor energy storage device in the adjustment station can respond to the coordination control request; Step 2: Lower the start threshold of the regenerative braking energy capacitor storage device in the regulating station V 1 and delay t 1. Go to step 4; Step 3: determine whether the capacitor voltage of the internal regenerative braking energy capacitor storage device of the next traction station adjacent to the adjacent traction station is less than the adjustment capacity threshold; if so, use the traction station as the adjustment station and execute step 2; otherwise, execute step 1; Step 4: Determine whether the coordinated control request instruction of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled disappears. If it disappears, restore the starting threshold of the regenerative braking energy capacitor energy storage device in each regulating station and exit the coordinated control. If it does not disappear, re-execute step 1.

2. A regenerative braking energy storage coordinated control method according to claim 1, characterized in that: The start threshold is lowered V 1 = 20V.

3. A regenerative braking energy storage coordinated control method according to claim 1, characterized in that: The step 2 is executed no more than 3 times.

4. A regenerative braking energy storage coordinated control system, characterized in that: include: A control request acquisition module, used to acquire a coordinated control request of a regenerative braking energy capacitor storage device in a traction station to be coordinated and controlled; A coordination control module, used to determine the capacitance state of the regenerative braking energy capacitor storage device in the traction station adjacent to the traction station to be coordinated and controlled, and to provide power support to the traction station to be coordinated and controlled according to its capacitance storage state; The triggering condition of the coordinated control request of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled is when any of the following conditions is met: The capacitor voltage of the regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled reaches its upper limit value, and the DC traction network voltage continues to rise; The regenerative braking energy capacitor storage device in the traction station to be coordinated and controlled is out of operation due to failure or maintenance; The power support for the traction station to be coordinated and controlled is provided according to the capacitance state of the regenerative braking energy capacitor storage device in the adjacent traction station, including: Step 1: determine whether the capacitor voltage of the regenerative braking energy capacitor energy storage device in the traction station adjacent to the traction station to be coordinated and controlled is less than the adjustment capacity threshold. If so, the adjacent traction station is used as the adjustment station and step 2 is executed; otherwise, step 3 is executed, wherein the adjustment capacity threshold is set according to the capacitor energy storage quantity, which is lower than the capacitor voltage absorption upper limit value, so that the capacitor voltage of the regenerative braking energy capacitor energy storage device in the adjustment station has a margin, and the regenerative braking energy capacitor energy storage device in the adjustment station can respond to the coordination control request; Step 2: Lower the start threshold of the regenerative braking energy capacitor storage device in the regulating station V 1 and delay t 1. Go to step 4; Step 3: determine whether the capacitor voltage of the internal regenerative braking energy capacitor storage device of the next traction station adjacent to the adjacent traction station is less than the adjustment capacity threshold; if so, use the traction station as the adjustment station and execute step 2; otherwise, execute step 1; Step 4: Determine whether the coordinated control request instruction of the regenerative braking energy capacitor energy storage device in the traction station to be coordinated and controlled disappears. If it disappears, restore the starting threshold of the regenerative braking energy capacitor energy storage device in each regulating station and exit the coordinated control. If it does not disappear, re-execute step 1.

5. A regenerative braking energy storage coordinated control system, characterized in that: include: Memory and processor; The memory is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 3.

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