Method and system for controlling double-direct-current power supply system for station

Abstract

The invention relates to the technical field of station low-voltage direct-current control, and particularly provides a station double-direct-current power supply system control method and system.The method is applied to a double-direct-current power supply system, and a first direct-current power supply system I-section direct-current bus and a second direct-current power supply system II-section direct-current bus are arranged on the two sides of an electric control switch and are connected in series based on the electric control switch; the method comprises the steps that under the condition that a sampling module detects that bus voltage of a first direct-current power supply system / a second direct-current power supply system is in an abnormal state, back-up power supply current of the corresponding first direct-current power supply system / the second direct-current power supply system is detected; and under the condition that the current of the backup power supply meets the preset condition, the electric control switch is controlled to be switched on. The states of the double-direct-current power supply system are clearly distinguished through the bus voltage and the back-up power supply current, targeted closing is carried out when a single direct-current power supply system breaks down, the standby function is automatically started, reliable operation of the direct-current power supply system is guaranteed, and fault expansion is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage direct current control for stations, and in particular to a control method and system for a dual direct current power supply system for stations. Background Art

[0002] In order to ensure the reliability of power supply, at present, at home and abroad, a redundant dual DC power supply system is used in power plants, various substations and other users using DC equipment, and a battery pack is designed as a backup power supply. Among them, a DC power supply system with two charging devices and two battery packs is adopted. Each battery pack and charging device are connected to the same section of the DC bus. The two DC power supply systems are backed up by a connecting switch (knife switch). The connecting switch (knife switch) serves as a bridge between the two DC power supply systems to realize mutual backup. Its role directly affects whether the reliability of the DC bus load power supply on the fault side can be maintained in the event of a power failure.

[0003] In recent years, many power accidents have occurred due to the failure of the AC power failure in the plant (station) and the failure of the battery pack to maintain the normal operation of the DC system, resulting in the expansion of the circuit breaker failure. In the prior art, the traditional contact switch needs to be manually operated, which has the problem of poor timeliness; in response to this situation, the patent with the publication number CN208316404U discloses an intelligent DC bus connection device, which is arranged between two sections of DC bus. When a section of the bus fails, such as voltage drops, the device can quickly provide power to the faulty bus through the other section of the bus without interruption, ensuring the continuous power supply of the faulty DC bus, thereby improving the reliability of the operation of the DC power supply system of the substation, but there are still hidden dangers related to the system status. For example, when the DC system of section I is in the state of bus short-circuit fault, a very large short-circuit current will be generated, which will burn the equipment and cause a fire in severe cases. If the contact switch is closed at this time, the other section of the normal DC system of section II will also have a short-circuit fault, expanding the scope of the accident. Summary of the invention

[0004] In response to the above problems, the present application provides a control method and system for a station-use dual DC power supply system. When it is detected that the DC system is in a state of bus short-circuit fault, the backup power supply current of the first DC power supply system / the second DC power supply system is detected until the backup power supply current meets the preset conditions, and the electronically controlled switch is controlled to close, thereby achieving short-circuit and high current protection.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a control method for a dual DC power supply system for a station, which is applied between a first DC power supply system and a second DC power supply system, wherein a DC bus of a section I of the first DC power supply system and a DC bus of a section II of the second DC power supply system are on both sides of an electronically controlled switch, and are connected in series based on the electronically controlled switches, and the electronically controlled switches are also connected to a control module and a sampling module respectively, including:

[0007] When receiving the signal from the sampling module that the bus voltage of the first DC power supply system / the second DC power supply system is in an abnormal state, detecting the backup power supply current of the first DC power supply system / the second DC power supply system;

[0008] When the backup power supply current meets a preset condition, the electric control switch is controlled to close.

[0009] In a possible implementation, the section I DC bus is connected to the first backup power supply of the first DC power supply system, and the section II DC bus is connected to the second backup power supply of the second DC power supply system. When receiving the signal that the bus voltage of the first DC power supply system / the second DC power supply system is in an abnormal state detected by the sampling module, the backup power supply current of the first DC power supply system / the second DC power supply system is detected, including: when receiving the signal that the first bus voltage of the first DC power supply system detected by the sampling module is less than the closing voltage setting value, determining that the first DC power supply system is in an abnormal state; using the current sampling submodule to detect the output current of the first backup power supply to obtain the first backup power supply current; when receiving the signal that the second bus voltage of the second DC power supply system detected by the sampling module is less than the closing voltage setting value, determining that the second DC power supply system is in an abnormal state; using the current sampling submodule to detect the output current of the second backup power supply to obtain the second backup power supply current.

[0010] In a possible implementation, when the backup power supply current meets a preset condition, controlling the electronically controlled switch to close the switch includes: when the first backup power supply current / the second backup power supply current is greater than 0 and less than a maximum current preset value, controlling the electronically controlled switch to close the switch.

[0011] In a possible implementation, when the backup power supply current meets the preset conditions, before controlling the electronically controlled switch to close, the method further includes: when the first backup power supply current is greater than the maximum current preset value, controlling the electronically controlled switch to be in an off state until the first backup power supply current is less than the maximum current preset value; when the second backup power supply current is greater than the maximum current preset value, controlling the electronically controlled switch to be in an off state until the second backup power supply current is less than the maximum current preset value.

[0012] In a possible implementation, the method further includes: upon receiving the signal from the sampling module that the bus voltage of the first DC power supply system / the second DC power supply system is in a normal state, controlling the electronically controlled switch to be in an off state.

[0013] In a possible implementation, the first backup power supply and the second backup power supply are solid-state battery packs.

[0014] In one possible implementation, after controlling the electronically controlled switch to close, the method further includes: when the first DC power supply system is in an abnormal state, after controlling the electronically controlled switch to close, turning off the first relay switch KM1 between the first battery pack in the first DC power supply system and the section I DC bus; when the second DC power supply system is in an abnormal state, after controlling the electronically controlled switch to close, turning off the second relay switch KM2 between the second battery pack in the second DC power supply system and the section II DC bus.

[0015] In a possible implementation, the method further includes: after the sampling module detects the bus voltage and backup power supply current of the first DC power supply system / the second DC power supply system, using a display module to display them; at the same time, the sampling module converts the parameter analog signals of the bus voltage and the backup power supply current through A / D conversion and sends them to the control module, and the control module determines the state of the dual DC power supply system; when the bus voltage of the dual DC power supply system is in an abnormal state and the backup power supply current does not meet the preset conditions, the backup power supply is used to power the first DC power supply system / the second DC power supply system on the fault side.

[0016] In a possible implementation, the backup power supply is used to supply power to the first DC power supply system / the second DC power supply system on the fault side for a duration of 120 ms.

[0017] In a second aspect, the present application provides a station-use dual DC power supply system control system, which is used to implement the above-mentioned station-use dual DC power supply system control method, including a dual DC power supply subsystem, a sampling module, a control module and an electric control switch;

[0018] The electric control switch is connected in series between the DC buses of the first DC power supply system and the second DC power supply system of the dual DC power supply system, the control end of the electric control switch is connected to the control module, and the input end of the control module is connected to the output end of the sampling module;

[0019] The control module is used to detect the backup power supply current of the first DC power supply system / the second DC power supply system when the bus voltage of the first DC power supply system / the second DC power supply system detected by the sampling module is in an abnormal state; and control the electronically controlled switch to close the switch when the backup power supply current meets a preset condition.

[0020] The control method and system of the dual DC power supply system for a station provided by the present application detects the backup power supply current of the first DC power supply system / the second DC power supply system when the dual DC system is detected to be in the state of bus short-circuit fault, and controls the electric control switch to close the switch after the backup power supply current meets the preset conditions. The control method of the dual DC power supply system for a station provided by the present application supplies power to the load during the power failure reclosing caused by the backup power supply guarantee failure of the DC power supply system, clearly distinguishes the various states of the dual DC power supply system through the bus voltage and the backup power supply current, and performs targeted closing when a power failure of a single DC power supply system occurs, realizing automatic startup of the backup function, ensuring the reliable operation of the DC power supply system, and avoiding the expansion of the fault, thereby improving the stability and safety control of the DC power supply system when a fault occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present application and form a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0022] Figure 1 An optional flow chart of a control method for a station dual DC power supply system provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a system architecture of an intelligent synchronous communication device provided in an embodiment of the present application;

[0024] Figure 3 An optional flow chart of a control method for a station-use dual DC power supply system provided in an embodiment of the present application;

[0025] Figure 4A schematic diagram of the structure of an intelligent synchronous communication device provided in an embodiment of the present application;

[0026] Figure 5 An optional flow chart of a control method for a dual DC power supply system for a station provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of a station-based dual DC power supply system control system provided in an embodiment of the present application;

[0028] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] The DC power supply system for plants (stations) is a power supply device used in power plants, various substations and other users of DC equipment to provide DC power for signal equipment, protection, automatic devices, accident lighting, emergency power supply and circuit breaker opening and closing operations. In order to ensure that the power supply of control loads and power loads is reliable and uninterrupted in the event of an accident, the DC power supply system is designed with a battery pack as a backup power supply. A DC power supply system with two charging devices and two battery packs is used. Each battery and charging device should be connected to the same section of the corresponding DC bus. The two sets of DC power supply systems are mutually backed up by a contact switch (knife switch). The contact switch (knife switch) requires manual operation and only works when the DC power supply is repaired or fails. Due to the limited means of battery maintenance, many power accidents in recent years are caused by the failure of the AC power failure of the plant (station) and the failure of the battery pack to maintain the normal operation of the DC system, resulting in the expansion of the circuit breaker failure; if the two sets of DC systems that are mutually backed up can automatically and accurately realize mutual backing up, similar power system accidents can be avoided and the safety of the power system can be improved.

[0032] In order to solve the above technical problems, the present invention proposes the following technical solutions and corresponding embodiments.

[0033] Example 1

[0034] Combine the following Figures 1 to 7 The embodiments shown describe the technical solution of the present invention:

[0035] Figure 1 A flow chart of a control method for a station-based dual DC power supply system according to an embodiment of the present application is shown. The control method for a station-based dual DC power supply system according to an embodiment of the present application can be applied to a dual DC power supply system, in which a DC bus of a first DC power supply system and a DC bus of a second DC power supply system are on both sides of an electronically controlled switch, and are connected in series based on the electronically controlled switch. The electronically controlled switch is also connected to a control module and a sampling module, respectively, such as Figure 1 As shown, the control method of the dual DC power supply system for a station in the embodiment of the present application includes the following steps S101 to S102:

[0036] Step S101: upon receiving the signal from the sampling module that the bus voltage of the first DC power supply system / the second DC power supply system is in an abnormal state, detecting the backup power supply current of the first DC power supply system / the second DC power supply system.

[0037] In an embodiment of the present application, a control module is applied between a first DC power supply system and a second DC power supply system, and is connected in parallel with an electronically controlled switch, wherein the first DC power supply system includes a first charging module, a first battery pack, a first sampling module and a first power supply system load, and the second DC power supply system includes a second charging module, a second battery pack, a second sampling module and a second power supply system load, and the first charging module and the second charging module are respectively used in the first DC power supply system and the second DC power supply system to convert AC input into DC output, and provide power to the first power supply system load and the second power supply system load respectively; relative to the first charging module and the second charging module, the first battery pack and the second battery pack are respectively backup power supplies for the first DC power supply system and the second DC power supply system, and when the first charging module outputs abnormally in the first DC power supply system, the first battery pack is used to immediately provide power to the first power supply system load; similarly, when the second charging module outputs abnormally in the second DC power supply system, the second battery pack is used to immediately provide power to the second power supply system load. Here, taking the first DC power supply system as a reference object, the second DC power supply system is equivalent to the backup power supply of the first DC power supply system through the electronically controlled switch. When the first charging module and the first battery pack of the first DC power supply system are unable to normally provide power to the load of the first power supply system, the second DC power supply system can be closed through the electronically controlled switch to provide reliable DC power for the load of the first power supply system on the fault side; conversely, the second DC power supply system is equivalent to the backup power supply of the first DC power supply system.

[0038] In an embodiment of the present application, the first sampling module and the second sampling module may respectively include a voltage sampling submodule and a current sampling submodule, the voltage sampling submodule is used to monitor the bus voltage in real time, and the current sampling submodule is used to collect the battery current, the backup power supply current of the first DC power supply system and the second DC power supply system at high speed.

[0039] In the embodiment of the present application, a first backup power supply is connected to the first section DC bus of the first DC power supply system, and a second backup power supply is connected to the second section DC bus of the second DC power supply system. The processing module and the control module of the present application can be arranged as an intelligent synchronous communication device located between the first DC power supply system and the second DC power supply system, such as Figure 2 As shown, the intelligent synchronous communication device includes a first backup power supply (corresponding to the attached Figure 2 The backup power supply located on the DC bus section I), the second backup power supply (corresponding to the attached Figure 2The backup power supply located on the section II DC bus), the electric control switch located between the section I DC bus and the section II DC bus, the first relay switch KM1 located between the first battery group and the section I DC bus, and the second relay switch KM2 located between the second battery group and the section II DC bus. Taking the first DC power supply system as a reference object, the first sampling module monitors the output current of the first backup power supply in real time and at high speed. When the first backup power supply has current output, the bus voltage state is judged according to the monitored first bus voltage to determine whether the state of the first DC power supply system is normal. As a feasible implementation method, the processing module compares the first voltage monitored by the first sampling module with the preset closing voltage setting value. When the first bus voltage is less than the closing voltage setting value, it is determined that the first DC power supply system is in an abnormal state. Here, the abnormal state can be understood as the first bus being in a pressure-loss state. It should be noted that when the judgment result is that the first DC power supply system is in a normal state, it is forbidden to close the electric control switch, because in the normal state of the DC system, the two sections of the DC system are not allowed to run in parallel for a long time, which will pose a safety hazard.

[0040] In the embodiment of the present application, the first backup power supply and the second backup power supply may be a solid-state battery pack or a supercapacitor, preferably a solid-state battery pack.

[0041] In an embodiment of the present application, when it is confirmed that the first DC power supply system is in an abnormal state, the first sampling module is used to monitor the output current of the first backup power supply, and the processing module determines whether to close the electric control switch immediately by judging the output current of the first backup power supply.

[0042] Step S102: When the backup power supply current meets a preset condition, control the electronically controlled switch to close.

[0043] In an embodiment of the present application, the preset condition may be a maximum current preset value preset in the processing module. When the first DC power supply system is in an abnormal state, a very large short-circuit current will be generated. At this time, the first backup power supply supplies power to the first power supply system load. During this period, the output current of the first backup power supply will continue to decrease. When the output current is less than the maximum current preset value, it is determined that the backup power supply current meets the preset condition, and then the control module controls the electric control switch to close. Prior to this, the electric control switch is in an open state. In an embodiment of the present application, the power supply time of the first backup power supply to supply power to the first DC power supply system on the fault side is 100±20ms.

[0044] In an embodiment of the present application, when the processing module compares and obtains that the current of the first backup power supply is greater than 0 and less than the maximum current preset value, the electronically controlled switch is controlled to close the switch, thereby safely and accurately closing the electronically controlled switch, effectively avoiding the DC power supply system from losing pressure due to a power failure in the DC power supply system, and thus avoiding the expansion of electrical accidents caused by this.

[0045] In the embodiment of the present application, before the backup power supply current meets the preset condition, such as Figure 3 As shown, the station dual DC power supply system control method of the embodiment of the present application may also include step S302:

[0046] In the case where the current of the first backup power supply is greater than the preset maximum current value, the electronically controlled switch is controlled to be in an off state until the current of the first backup power supply is less than the preset maximum current value.

[0047] In an embodiment of the present application, when the first DC power supply system is in an abnormal state, after the electronically controlled switch is controlled to be closed, in order to avoid the long-term operation of the two sets of batteries affecting the battery life, the first relay switch KM1 between the first battery group in the first DC power supply system and the I-section DC bus is turned off; similarly, when the second DC power supply system is in an abnormal state, after the electronically controlled switch is controlled to be closed, the second relay switch KM2 between the second battery group in the second DC power supply system and the II-section DC bus is turned off to automatically disconnect the faulty battery after the two bus sections are synchronized.

[0048] It should be noted that the fault side (ie, the reference object) may be the second DC power supply system. In this case, the corresponding control method is the same as above and will not be elaborated here.

[0049] Through the control method and system of the dual DC power supply system for a station provided by the present application, when it is detected that the dual DC system is in a state of bus short-circuit fault, the backup power supply current of the first DC power supply system / the second DC power supply system is detected, and after the backup power supply current meets the preset conditions, the electronically controlled switch is controlled to close. The control method of the dual DC power supply system for a station of the present application supplies power to the load during the power failure reclosing caused by the backup power supply guarantee failure of the DC power supply system, clearly distinguishes the various states of the dual DC power supply system through the bus voltage and the backup power supply current, and performs targeted closing when a power failure occurs in a single DC power supply system, realizing automatic startup of the backup function, ensuring the reliable operation of the DC power supply system, and avoiding the expansion of the fault, thereby improving the stability and safety control of the DC power supply system when a fault occurs.

[0050] Example 2

[0051] Based on the above embodiments, the present application provides an intelligent synchronous communication device, such as Figure 4 As shown, the intelligent synchronous communication device includes a CPU, a short-circuit fault protection module, a display module, a charging module, a backup battery pack, a current sampling module, a voltage sampling module, a control module, and an electric control switch. The current sampling module is connected to the backup battery pack (corresponding to the backup power supply of the embodiment of the present application) to monitor the output current of the backup battery pack.

[0052] Among them, the voltage sampling module and the current sampling module complete the measurement of bus voltage, high-speed acquisition of battery current and backup battery pack current, and display the data through the display module. The device system converts the parameter analog signal to the CPU through A / D. The CPU control center will perform data analysis through the program algorithm and adopt an intelligent closing strategy to determine whether the system state is in a loss of pressure fault state at this moment. If it is determined to be a loss of pressure fault state, the CPU will send a control instruction to the control module to control the electric control switch coil to enable the suction. Since the closing process of the electric control switch takes a short time, the backup battery pack will supply power to the DC load on the fault side for a short time in this process until the closing of the electric control switch is completed. On the contrary, when it is determined to be a non-loss of pressure fault state or a bus short-circuit fault state, the intelligent synchronous communication device will not perform the closing action, that is, when a bus short-circuit fault is detected, the CPU will send a protection instruction to the short-circuit fault protection module to prohibit the closing of the electric control switch to achieve the short-circuit high current protection function.

[0053] Based on the above intelligent synchronous communication device, Figure 5 As shown, the control method of the dual DC power supply system for a station in the embodiment of the present application includes the following steps S501 to S504:

[0054] Step S501: The voltage sampling module and the current sampling module perform real-time detection of the battery pack current, bus voltage, and backup power supply current.

[0055] In the embodiment of the present application, the voltage sampling module and the current sampling module detect system parameters to obtain real-time parameter data, and the real-time parameter data includes battery pack current, bus voltage, and backup power supply current.

[0056] Step S502: The processing module receives real-time parameter data, and determines whether the state of the DC power supply system is normal based on the real-time parameter data.

[0057] In the embodiment of the present application, if the DC power supply system is in a normal state in the first round of judgment, closing is prohibited, and the normal state is that the bus voltage is greater than the closing voltage setting value; if the bus voltage is less than the closing voltage setting value, a second round of judgment is performed to judge that the backup power supply current is greater than the maximum current setting value. When the bus voltage is less than the closing voltage setting value and the backup power supply current is greater than the maximum current setting value, it is judged as a bus short-circuit fault state, closing is prohibited, and the third round of judgment is entered. Here, the DC power supply system can be any system in the first DC power supply system or the second DC power supply system.

[0058] Step S503, determine whether the bus voltage is less than the closing voltage setting value, and the backup power supply current is greater than 0 and less than the maximum current setting value. If so, execute step S504, otherwise, closing is prohibited.

[0059] In the embodiment of the present application, when the state of the DC power supply system is in an abnormal state, that is, in the third round of judgment, the backup power supply current data detected in the real-time parameter data is compared with the third judgment condition, that is, it is judged whether the backup power supply current is in the range of 0 to the maximum current preset value when the bus voltage is less than the closing voltage setting value. If so, the electric control switch is automatically closed, otherwise the closing is prohibited.

[0060] Step S504: The control module controls the closing of the electric control switch.

[0061] Through this set of intelligent closing strategies, the various states of the system can be clearly distinguished, and targeted closing can be performed when a power failure occurs in the DC power supply system, realizing automatic startup of the backup function, ensuring the reliable operation of the DC power supply system, and improving the stability and safety of the DC power supply system.

[0062] The present invention further provides a station dual DC power supply system control system 600, which can be used to execute the station dual DC power supply system control method of any of the above embodiments of the present invention. Figure 6 A schematic diagram of the structure of a station dual DC power supply system control system 600 provided in an embodiment of the present application includes a dual DC power supply subsystem 601, a sampling module 602, a control module 603 and an electric control switch 604, wherein the electric control switch 604 is connected in series between the DC buses of the first DC power supply system and the second DC power supply system of the dual DC power supply subsystem 601, the control end of the electric control switch 604 is connected to the control module 603, and the input end of the control module 603 is connected to the output end of the sampling module 602:

[0063] The control module 603 is used to detect the backup power supply current of the first DC power supply system / the second DC power supply system when the bus voltage of the first DC power supply system / the second DC power supply system detected by the sampling module 602 is in an abnormal state; and control the electric control switch 604 to close the switch when the backup power supply current meets the preset conditions.

[0064] The present application also provides an electronic device, such as Figure 7 As shown, the electronic device 700 can be a server, and the electronic device 700 includes a processor 701, a memory, a network interface 703 and a database 70213 connected through a system bus 704. The processor 701 is used to provide computing and control capabilities; the memory includes a non-volatile storage medium 7021 and an internal memory 7022, wherein the non-volatile storage medium 7021 stores an operating system 70211, a computer program 70212 and a database 70213, and the internal memory 7022 provides an environment for the operation of the operating system 70211 and the computer program 70212 in the non-volatile storage medium; the database 70213 is used to provide data such as the operating program of each system node; the network interface 703 is used to communicate with an external terminal through a network connection; when the computer program is executed by the processor 701, the control method of the station dual DC power supply system described in any of the above embodiments is implemented.

[0065] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the control method of the station dual DC power supply system in any embodiment of the present application is implemented. Specifically, a system or device equipped with a storage medium can be provided, on which a software program code that implements the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or device reads and executes the program code stored in the storage medium.

[0066] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication part, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), the above-mentioned functions defined in the system of the present application are executed.

[0067] It should be noted that the computer-readable storage medium shown in the present invention can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium may also be any computer-readable storage medium other than a computer-readable storage medium that can send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0068] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0069] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0070] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0071] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation of the present invention.

[0072] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

[0073] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0074] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A control method for a station dual DC power supply system, characterized in that: Applied between a first DC power supply system and a second DC power supply system, the first DC power supply system's section I DC bus and the second DC power supply system's section II DC bus are on both sides of an electronically controlled switch, and based on the electronically controlled switch being connected in series, the electronically controlled switch is also respectively connected to a control module and a sampling module, the method comprising: When receiving the signal from the sampling module that the bus voltage of the first DC power supply system / the second DC power supply system is in an abnormal state, detecting the backup power supply current of the first DC power supply system / the second DC power supply system; When the backup power supply current meets a preset condition, the electric control switch is controlled to close.

2. The control method of the station dual DC power supply system according to claim 1, characterized in that: The first section of the DC bus is connected to the first backup power supply of the first DC power supply system, and the second section of the DC bus is connected to the second backup power supply of the second DC power supply system. When receiving the signal that the bus voltage of the first DC power supply system / the second DC power supply system is in an abnormal state detected by the sampling module, the backup power supply current of the first DC power supply system / the second DC power supply system is detected, including: When receiving the signal that the first bus voltage of the first DC power supply system detected by the sampling module is less than the closing voltage setting value, determining that the first DC power supply system is in an abnormal state; using the current sampling submodule to detect the output current of the first backup power supply to obtain the first backup power supply current; When the second bus voltage of the second DC power supply system detected by the sampling module is less than the closing voltage setting value, it is determined that the second DC power supply system is in an abnormal state; the output current of the second backup power supply is detected by the current sampling submodule to obtain the second backup power supply current.

3. The control method of the station dual DC power supply system according to claim 2, characterized in that: When the backup power supply current meets a preset condition, controlling the electronically controlled switch to close the switch comprises: When the first backup power supply current / the second backup power supply current is greater than 0 and less than a maximum current preset value, the electronically controlled switch is controlled to close.

4. The control method of the station dual DC power supply system according to claim 3, characterized in that: When the backup power supply current meets the preset condition, before controlling the electric-controlled switch to close, the method further includes: When the current of the first backup power supply is greater than the preset maximum current value, controlling the electronically controlled switch to be in an off state until the current of the first backup power supply is less than the preset maximum current value; When the current of the second backup power supply is greater than the preset maximum current value, the electronically controlled switch is controlled to be in an off state until the current of the second backup power supply is less than the preset maximum current value.

5. The control method of a station dual DC power supply system according to claim 1, characterized in that: The method further comprises: When the bus voltage of the first DC power supply system / the second DC power supply system detected by the sampling module is in a normal state, the electronically controlled switch is controlled to be in an off state.

6. The control method of a station dual DC power supply system according to claim 2, characterized in that: The first backup power supply and the second backup power supply are solid-state battery packs.

7. The control method for a station dual DC power supply system according to any one of claims 1 to 6, characterized in that: After controlling the electronically controlled switch to close, the method further includes: When the first DC power supply system is in an abnormal state, after the electric control switch is controlled to be closed, the first relay switch KM1 between the first battery pack in the first DC power supply system and the first section DC bus is turned off; When the second DC power supply system is in an abnormal state, after the electronically controlled switch is controlled to close, the second relay switch KM2 between the second battery pack in the second DC power supply system and the section II DC bus is turned off.

8. The control method of a station dual DC power supply system according to claim 1, characterized in that: The method further comprises: After the sampling module detects the bus voltage and the backup power supply current of the first DC power supply system / the second DC power supply system, the display module is used to display them; at the same time, the sampling module converts the parameter analog signals of the bus voltage and the backup power supply current through A / D conversion and sends them to the control module, and the control module determines the state of the dual DC power supply system; When the bus voltage of the dual DC power supply system is in an abnormal state and the backup power supply current does not meet the preset condition, the backup power supply is used to supply power to the first DC power supply system / the second DC power supply system on the fault side.

9. The control method of a station dual DC power supply system according to claim 8, characterized in that: The power supply duration of using the backup power supply to supply power to the first DC power supply system / the second DC power supply system on the fault side is 120ms.

10. A station-use dual DC power supply system control system, used to execute the station-use dual DC power supply system control method according to any one of claims 1 to 9, characterized in that: It includes a dual DC power supply subsystem, a sampling module, a control module and an electric control switch; The electric control switch is connected in series between the DC buses of the first DC power supply system and the second DC power supply system of the dual DC power supply system, the control end of the electric control switch is connected to the control module, and the input end of the control module is connected to the output end of the sampling module; The control module is used to detect the backup power supply current of the first DC power supply system / the second DC power supply system when the bus voltage of the first DC power supply system / the second DC power supply system detected by the sampling module is in an abnormal state; and control the electronically controlled switch to close the switch when the backup power supply current meets a preset condition.

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