Graded protection control system and method for MW-level high-voltage power supply

Abstract

The invention discloses an MW-level high-voltage power supply grading protection control system and method, and the system comprises a high-voltage power supply main loop which comprises a vacuum switch, a high-voltage transformer, and a plurality of power modules which are connected in series; the hierarchical protection control system is used for giving out different protection control instructions in a hierarchical manner according to a fault signal of a load, a module overcurrent signal, a module overvoltage signal and a total direct current overcurrent and / or overvoltage signal, and executing different protection actions on devices in a main loop of the high-voltage power supply; comprising the steps of first-stage protection control, and total direct current over-current and / or over-voltage protection control of a high-voltage power supply; second-stage protection control: direct-current over-current protection control of the power supply module; third-stage protection control: AC overcurrent protection control of the high-voltage power supply main loop; the fourth-stage protection control is used for protecting and controlling a high-voltage protective tube connected with the total direct-current output of the high-voltage power supply main loop; and the fifth-stage protection control is remote sudden stop protection control. Reliable and rapid protection is realized, and the experiment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a MW-level high-voltage power supply hierarchical protection control system and method. Background Art

[0002] HL-3 is a newly built large-scale magnetic confinement nuclear fusion tokamak device in my country. In the physical experiments of the tokamak device, heating experiments such as electron cyclotron, low-noise, and neutral beam injection are often carried out to obtain the corresponding physical experimental results. Gyrotrons, klystrons, neutral beam ion sources, etc. are key components of the heating system, and high-voltage power supplies provide high voltage for such loads. The capacity of high-voltage power supplies is usually MW level, or even more than tens of MW.

[0003] The heating system is a complex system involving many components. The lines between the high-voltage power supply and loads such as gyrotrons, klystrons, and ion sources are long. During operation, the components are prone to short circuits and sparks, and the spark current can reach thousands of amperes. In order to protect the power supply and loads, it is necessary to propose targeted control and protection methods based on the fault conditions and protection requirements of such systems.

[0004] The existing high-voltage power supply control protection method usually directly receives the fault signal of the load and shuts down the high-voltage power supply as a whole to obtain rapid protection. Its disadvantage is that the control protection does not realize hierarchical protection, and the power supply recovery after protection needs to wait for the next experimental power supply to be put into operation, resulting in low experimental efficiency. Therefore, this protection control method is not suitable for the existing device experimental requirements and is not suitable for promotion.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the existing high-voltage power supply control and protection method usually directly receives the fault signal of the load and shuts down the high-voltage power supply as a whole to obtain rapid protection. However, the control protection does not realize hierarchical protection. The power supply recovery after protection needs to wait for the next experimental power supply to be put into operation, resulting in low experimental efficiency. The purpose of the present invention is to provide a MW-level high-voltage power supply hierarchical protection control system and method. The present invention is aimed at high-power high-voltage power supplies, fully utilizes the main circuit of the high-voltage power supply and the peripheral protection control system, and realizes hierarchical protection control based on the control and protection strategy combining hardware and software, so as to realize the protection of the high-voltage power supply and the load; the present invention takes different measures according to the level of the fault, which greatly improves the efficiency of the experiment. The present invention ensures that both reliable and rapid protection can be achieved and the efficiency of the experiment can be improved.

[0007] The present invention is achieved through the following technical solutions:

[0008] In a first aspect, the present invention provides a MW-level high voltage power supply hierarchical protection control system, the system comprising:

[0009] The main circuit of high-voltage power supply includes a vacuum switch, a high-voltage transformer and several power modules connected in series;

[0010] The hierarchical protection control system is used to hierarchically issue different protection control instructions according to load fault signals, module overcurrent signals, module overvoltage signals, total DC current overcurrent and / or total DC overvoltage signals, and perform different protection actions on the devices in the main circuit of the high-voltage power supply; including:

[0011] First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply;

[0012] The second level protection control is the DC over-current protection control of the power module;

[0013] The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply;

[0014] The fourth level protection control is the high voltage fuse protection control of the total DC output connection of the high voltage power supply main circuit;

[0015] Fifth level protection control, protection control of remote emergency stop vacuum switch.

[0016] Furthermore, one end of the vacuum switch is connected to the power grid (or the output side of the generator), and the other end of the vacuum switch is connected to the primary winding of the high-voltage transformer, and the secondary winding of the high-voltage transformer is connected to several power modules; the total output of the several power modules is connected to the load.

[0017] Further, the hierarchical protection control system includes an AC measurement circuit, a module current measurement circuit, a high-voltage voltage divider and a sensor module, a high-voltage fuse, an emergency stop button, a conversion interface, a total power supply voltage and current measurement module and a controller;

[0018] AC measurement circuit, used to measure the incoming current of the vacuum switch;

[0019] Module current measurement loop, used to measure the current of each power module;

[0020] High-voltage voltage divider and sensor module, used to collect the total output voltage and current of the power module;

[0021] High-voltage fuse, serving as the total DC over-current protection control for the main circuit of the high-voltage power supply;

[0022] Emergency stop button, used for the on-duty personnel to manually operate the emergency stop button to achieve system protection;

[0023] Conversion interface, used for mutual conversion between electrical signals and optical signals;

[0024] A total power supply voltage and current measurement module is used to measure the total output voltage and total current of the power supply module;

[0025] The controller is used to receive overvoltage signals or overcurrent signals fed back from the AC measurement circuit, the total power supply voltage and the current measurement module, and issue different protection control instructions in stages to perform different protection actions on the devices in the high-voltage power supply main circuit.

[0026] Furthermore, one end of the AC measurement circuit is connected to the vacuum switch and the other end is connected to the controller; the module current measurement circuit is arranged inside each power module; one end of the high-voltage voltage divider and the sensor module is connected to the output of the power module and the other end is connected to the high-voltage fuse, and the high-voltage fuse is connected to the load; the other end of the high-voltage voltage divider and the sensor module is also connected to the total power supply voltage and current measurement module, the total power supply voltage and current measurement module is connected to the conversion interface, and the conversion interface is connected to the controller; each power module is connected to the conversion interface; the emergency stop button is connected to the vacuum switch.

[0027] In a second aspect, the present invention further provides a MW-level high-voltage power supply hierarchical protection control method. The present invention is based on the above-mentioned MW-level high-voltage power supply hierarchical protection control system, and the control method includes:

[0028] According to the load fault signal, module overcurrent signal, module overvoltage signal, total DC current overcurrent and / or total DC overvoltage signal, different protection control instructions are issued in stages to perform different protection actions on the devices in the main circuit of the high-voltage power supply; different protection controls include:

[0029] First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply;

[0030] The second level protection control is the DC over-current protection control of the power module;

[0031] The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply;

[0032] The fourth level protection control is the high voltage fuse protection control of the total DC output connection of the high voltage power supply main circuit;

[0033] Fifth level protection control, protection control of remote emergency stop vacuum switch.

[0034] Furthermore, the first level protection control includes:

[0035] According to the maximum withstand voltage of the load, the total DC overvoltage protection value of each power module in the high-voltage power main circuit is set; the output end of the high-voltage voltage divider in the high-voltage voltage divider and the sensor module is connected to the high-voltage DC voltage measurement circuit of the total power voltage and current measurement module, and the total voltage value is converted into a digital frequency signal, which is sent to the controller through the conversion interface for calculation to obtain the voltage value; if the voltage value exceeds the total DC overvoltage protection value, the controller sends a blocking pulse, all power modules are blocked, and the high-voltage power output is zero;

[0036] According to the maximum load current, the total DC overcurrent protection value of each power module in the main circuit of the high-voltage power supply is set; the output end of the high-voltage divider and the high-voltage sensor in the sensor module is connected to the high-voltage DC current measurement circuit of the total power supply voltage and current measurement module, and the total current value is converted into a digital frequency signal, which is sent to the controller through the conversion interface for calculation to obtain the current value; if the current value exceeds the total DC overcurrent protection value, the controller sends a blocking pulse, all power modules are blocked, and the high-voltage power supply output is zero;

[0037] In the above technical solution, the real-time controller sends out a blocking pulse to shut down all power modules and reduce the high-voltage power output to zero; after the fault is eliminated, the controller can continue to send out control signals and the high-voltage power can continue to be put into operation quickly.

[0038] Furthermore, the second level protection control includes:

[0039] Design a module current measurement circuit and select a corresponding current sensor based on the maximum working current of a single power module; design a current measurement protection circuit in the module current measurement circuit, the protection value of the current measurement protection circuit is set according to the actual working conditions of the power supply, and the current sensor of each power module is consistent with the current measurement protection circuit; when the module current exceeds its protection value, the module current measurement circuit sends a fault signal, blocks the module control pulse, the power module stops working, and the high-voltage power supply output voltage and current are zero.

[0040] Furthermore, the third level protection control includes:

[0041] According to the operation and use of the high-voltage power supply, the AC transformer and current relay of the AC measurement circuit are selected to adjust the current value of the current relay; at the same time, the auxiliary node inside the current relay is sent to the controller. When the AC current exceeds the preset protection value, the auxiliary node inside the current relay changes and sends a signal to the controller, thereby disconnecting the vacuum switch.

[0042] Furthermore, the fourth level of protection control includes:

[0043] According to the rated output current of the high-voltage power supply, select a suitable high-voltage fuse; when an abnormal fault short circuit occurs in the entire high-voltage power supply main circuit and the hierarchical protection control system fails to block the power module in time, the fuse in the high-voltage fuse will quickly blow to achieve system protection.

[0044] Furthermore, the fifth level of protection control includes:

[0045] When the power supply of the hierarchical protection control system is cut off or an emergency such as fire or explosion occurs in the main circuit of the high-voltage power supply, the on-duty personnel manually operate the emergency stop button to disconnect the vacuum switch to achieve system protection.

[0046] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0047] 1. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method, which fully utilizes the main circuit of the high-voltage power supply and the peripheral protection control system, implements hierarchical protection control based on a control protection strategy combining hardware and software, and realizes the protection of the high-voltage power supply and the load; the present invention ensures that both reliable and rapid protection can be achieved and the efficiency of the experiment can be improved.

[0048] 2. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. Compared with conventional power supply protection control methods, the hierarchical control is adopted, and different measures can be taken according to the level of the fault, thereby greatly improving the efficiency of the experiment.

[0049] 3. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. When performing DC overvoltage protection and overcurrent protection of the high-voltage power supply, the measured voltage signal and current signal are transmitted using digital signals, thereby avoiding attenuation of the measured signal during transmission.

[0050] 4. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. When performing DC overvoltage protection and overcurrent protection of the high-voltage power supply, the measured voltage signal and current signal are sent to the controller through electro-optical conversion, and photoelectric isolation can improve the safety of the entire protection control system.

[0051] 5. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. When the high voltage can be quickly cut off by turning off the power module, there is no need to cut off the vacuum switch, thereby avoiding frequent opening of the vacuum switch and reducing the life of the vacuum switch.

[0052] 6. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. When the load ignites particularly violently and the module protection and control system protection speeds are insufficient, the high-voltage fuse can be directly blown to protect the load.

[0053] 7. The present invention provides a MW-level high-voltage power supply hierarchical protection control system and method. When the system is powered off, the emergency stop button can be manually operated to disconnect the vacuum switch to ensure the safety of on-site equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0055] Figure 1 This is a structural block diagram of a MW-level high-voltage power supply hierarchical protection control system of the present invention;

[0056] Figure 2 This is a schematic diagram of the structure of a MW-level high-voltage power supply hierarchical protection control system of the present invention;

[0057] Figure 3 This is a flow chart of a MW-level high-voltage power supply hierarchical protection control method of the present invention.

[0058] Reference numerals and corresponding component names:

[0059] 1-AC measurement circuit, 2-module current measurement circuit, 3-vacuum switch, 4-high voltage transformer, 5-power module, 7-high voltage voltage divider and sensor module, 8-high voltage fuse, 9-emergency stop button, 10-conversion interface, 11-total power supply voltage and current measurement module, 12-controller. DETAILED DESCRIPTION

[0060] Hereinafter, the term "include" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present invention, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0061] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0062] The expressions (such as "first", "second", etc.) used in various embodiments of the present invention may modify the various constituent elements in various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing an element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0063] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0064] The terms used in various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0065] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary implementation modes of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0066] The existing high-voltage power supply control protection method usually directly receives the fault signal of the load and shuts down the high-voltage power supply as a whole to obtain rapid protection. However, the control protection does not implement hierarchical protection. The power recovery after protection needs to wait for the next experimental power supply before it can be put into operation, resulting in low experimental efficiency.

[0067] Therefore, the present invention designs a MW-level high-voltage power supply hierarchical protection control system and method. The present invention is aimed at high-power high-voltage power supplies, makes full use of the main circuit of the high-voltage power supply and the peripheral protection control system, and realizes hierarchical protection control based on the control protection strategy combined with hardware and software to realize the protection of the high-voltage power supply and the load; the present invention takes different measures according to the level of the fault, greatly improving the efficiency of the experiment. The present invention ensures that both reliable and rapid protection can be achieved and the efficiency of the experiment can be improved.

[0068] Example 1

[0069] like Figure 1 and Figure 2 As shown, the present invention provides a MW-level high-voltage power supply hierarchical protection control system, the system comprising:

[0070] The high-voltage power supply main circuit includes a vacuum switch 3, a high-voltage transformer 4 and a plurality of power supply modules 5 connected in series;

[0071] The hierarchical protection control system is used to hierarchically issue different protection control instructions according to the load fault signal, module overcurrent signal, module overvoltage signal, total DC current overcurrent and / or total DC overvoltage signal, and perform different protection actions on the devices in the main circuit of the high-voltage power supply; including:

[0072] First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply;

[0073] Second level protection control, DC overcurrent protection control of power module 5;

[0074] The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply;

[0075] The fourth level protection control is the protection control of the high voltage fuse (8) connected to the total DC output of the high voltage power supply main circuit;

[0076] Fifth level protection control, protection control of remote emergency stop vacuum switch 3.

[0077] In this embodiment, one end of the vacuum switch 3 is connected to the power grid (or the output side of the generator), and the other end of the vacuum switch 3 is connected to the primary winding of the high-voltage transformer 4. The secondary winding of the high-voltage transformer 4 is connected to a plurality of power modules 5; the total output of the plurality of power modules 5 is connected to the load.

[0078] In this embodiment, the hierarchical protection control system includes an AC measurement circuit 1, a module current measurement circuit 2, a high-voltage voltage divider and sensor module 7, a high-voltage fuse 8, an emergency stop button 9, a conversion interface 10, a total power supply voltage and current measurement module 11 and a controller 12;

[0079] AC measurement circuit 1, used to measure the incoming current of the vacuum switch 3;

[0080] The module current measurement loop 2 is used to measure the current of each power module 5;

[0081] A high-voltage voltage divider and sensor module 7, used to collect the total output voltage and total current of the power module 5;

[0082] High voltage fuse 8, as the total DC overcurrent protection control of the high voltage power supply main circuit;

[0083] The emergency stop button 9 is used for the on-duty personnel to manually operate the emergency stop button 9 to realize system protection when the power supply of the hierarchical protection control system is cut off or an emergency such as fire or explosion occurs in the main circuit of the high-voltage power supply;

[0084] The conversion interface 10 is used for converting electrical signals into optical signals and integrating different external signals;

[0085] A total power supply voltage and current measurement module 11 is used to measure the total output voltage and total current of the power supply module 5;

[0086] The controller 12 is used to receive the overvoltage signal or overcurrent signal fed back from the AC measurement circuit 1 and the total power supply voltage and current measurement module 11, and to issue different protection control instructions in different levels to perform different protection actions on the components in the high-voltage power supply main circuit. The controller 12 may be a PLC controller.

[0087] Specifically, one end of the AC measurement circuit 1 is connected to the vacuum switch 3 and the other end is connected to the controller 12; the module current measurement circuit 2 is arranged inside each power module 5; one end of the high-voltage voltage divider and sensor module 7 is connected to the output of the power module 5 and the other end is connected to the high-voltage fuse 8, and the high-voltage fuse 8 is connected to the load; the other end of the high-voltage voltage divider and sensor module 7 is also connected to the total power supply voltage and current measurement module 11, the total power supply voltage and current measurement module 11 is connected to the conversion interface 10, and the conversion interface 10 is connected to the controller 12; each power module 5 is connected to the conversion interface 10; the emergency stop button 9 is connected to the vacuum switch 3.

[0088] During specific implementation, the AC current protection value of the high-voltage power supply, the module current protection value and the voltage and current protection value of the DC output are calculated according to the usage of the high-voltage power supply and the normal working parameters of the power supply.

[0089] As a further implementation, a current transformer and a current relay for the AC measurement loop 1 are selected, and the current value of the current relay is set, and the auxiliary node of the current relay is sent to the controller.

[0090] As a further implementation, since multiple power modules are in series working mode, the corresponding current sensor can be selected according to the working current of a single power module, and a current measurement protection circuit can be designed. The protection value of the current measurement protection circuit can be set according to the actual working conditions of the power supply, and the current sensor of each power module is consistent with the current measurement protection circuit.

[0091] As a further implementation, the output of the current measurement protection circuit is sent to a switch device control port inside the power module.

[0092] As a further implementation, at the output end of the DC high voltage, a corresponding high voltage divider is selected, and the high voltage divider is connected in parallel between the output of the DC high voltage and the ground.

[0093] As a further implementation, the measurement port of the high voltage divider is sent to the conversion interface 10, and then the converted voltage frequency signal is sent to the controller.

[0094] As a further implementation, at the output end of the DC high voltage, a corresponding current sensor is selected, and the current sensor is sleeved near the grounding end of the high voltage main circuit to measure the current output of the entire DC high voltage.

[0095] As a further implementation, the measuring port of the current sensor is sent to the conversion interface 10, and then the converted current frequency signal is sent to the controller.

[0096] As a further implementation, the hierarchical protection control system issues control instructions and executes control operations according to various signals and protection levels from the power supply system. Among them, the first level of protection control is that the real-time controller sends a blocking pulse to shut down all power modules and reduce the high-voltage output to zero; after the fault is removed, the controller can continue to send control signals, and the high-voltage power supply can continue to be quickly put into use, greatly improving the experimental efficiency. The second level of protection control is that the power module automatically blocks the trigger signal inside the power module according to the collected module current, if it exceeds the set current value of the measurement comparator, to achieve protection. The third level of protection control is that when the AC overcurrent occurs, the relay auxiliary node sends a signal to the PLC controller, and the PLC controller sends a vacuum switch opening signal to ensure the safety of the high-voltage power supply and the subsequent load. The fourth level of protection control is that when the high-voltage DC current exceeds the fuse current of the fuse, the high-voltage fuse fuses to achieve protection. The fifth level of protection control is that when the entire control system fails and the control loses power, the on-duty personnel manually operate the emergency stop button to achieve protection.

[0097] Example 2

[0098] like Figure 3As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a MW-level high-voltage power supply hierarchical protection control method. The present invention is a MW-level high-voltage power supply hierarchical protection control system based on embodiment 1, and the control method includes:

[0099] According to the load fault signal, module overcurrent signal, module overvoltage signal, total DC current overcurrent and / or total DC overvoltage signal, different protection control instructions are issued in stages to perform different protection actions on the devices in the main circuit of the high-voltage power supply; different protection controls include:

[0100] First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply;

[0101] Second level protection control, DC overcurrent protection control of power module 5;

[0102] The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply;

[0103] The fourth level protection control is the protection control of the high voltage fuse (8) connected to the total DC output of the high voltage power supply main circuit;

[0104] Fifth level protection control, protection control of remote emergency stop vacuum switch 3.

[0105] The priority order of the above levels of protection control is: first-level protection control, second-level protection control, third-level protection control, fourth-level protection control and fifth-level protection control.

[0106] Furthermore, the first level protection control includes:

[0107] According to the maximum withstand voltage of the load, the total DC overvoltage protection value of each power module in the high-voltage power main circuit is set; the output end of the high-voltage voltage divider in the high-voltage voltage divider and the sensor module 7 is connected to the high-voltage DC voltage measurement circuit of the total power voltage and current measurement module 11, and the total voltage value is converted into a digital frequency signal, which is sent to the controller 12 through the conversion interface 10 for calculation to obtain the voltage value; if the voltage value exceeds the total DC overvoltage protection value, the controller 12 sends a blocking pulse, all power modules 5 are blocked, and the high-voltage power output is zero;

[0108] According to the maximum load current, the total DC overcurrent protection value of each power module in the high-voltage power main circuit is set; the output end of the high-voltage sensor in the high-voltage divider and sensor module 7 is connected to the high-voltage DC current measurement circuit of the total power voltage and current measurement module 11, and the total current value is converted into a digital frequency signal, which is sent to the controller 12 through the conversion interface 10 for calculation to obtain the current value; if the current value exceeds the total DC overcurrent protection value, the controller 12 sends a blocking pulse, all power modules 5 are blocked, and the high-voltage power output is zero;

[0109] In the above technical solution, the real-time controller sends out a blocking pulse to shut down all power modules and reduce the high-voltage power output to zero; after the fault is eliminated, the controller can continue to send out control signals and the high-voltage power can continue to be put into operation quickly.

[0110] Furthermore, the second level protection control includes:

[0111] The module current measurement loop 2 is designed according to the maximum working current of a single power module 5 and the corresponding current sensor is selected; a current measurement protection circuit is designed in the module current measurement loop 2, and the protection value of the current measurement protection circuit is set according to the actual working condition of the power supply, and the current sensor of each power module 5 is consistent with the current measurement protection circuit; when the module current exceeds its protection value, the module current measurement loop 2 sends a fault signal, blocks the module control pulse, the power module 5 stops working, and the high-voltage power supply output voltage and current are zero.

[0112] Furthermore, the third level protection control includes:

[0113] According to the operation and use of the high-voltage power supply, the AC transformer and current relay of the AC measurement circuit 1 are selected to adjust the current value of the current relay; at the same time, the auxiliary node inside the current relay is sent to the controller 12. When the AC current exceeds the preset protection value, the auxiliary node inside the current relay changes and sends a signal to the controller 12, thereby disconnecting the vacuum switch 1.

[0114] Furthermore, the fourth level of protection control includes:

[0115] According to the rated output current of the high-voltage power supply, a suitable high-voltage fuse 8 is selected; when an abnormal fault short circuit occurs in the entire high-voltage power supply main circuit and the hierarchical protection control system fails to block the power module in time, the fuse in the high-voltage fuse 8 will blow quickly to achieve system protection.

[0116] Furthermore, the fifth level of protection control includes:

[0117] When the power supply of the hierarchical protection control system is cut off or an emergency such as fire or explosion occurs in the main circuit of the high-voltage power supply, the on-duty personnel manually operate the emergency stop button 9 to disconnect the vacuum switch 3 to achieve system protection.

[0118] The control method of the present invention can issue different protection control instructions and execute different protection actions according to different fault levels, and has high protection efficiency and reliable action, thus greatly improving the efficiency of the experiment.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A MW-level high-voltage power supply hierarchical protection control system, characterized in that: The system includes: A high-voltage power supply main circuit, comprising a vacuum switch (3), a high-voltage transformer (4) and a plurality of power supply modules (5) connected in series; A hierarchical protection control system, which is used to hierarchically issue different protection control instructions according to load fault signals, module overcurrent signals, module overvoltage signals, total DC current overcurrent signals and / or total DC overvoltage signals, and perform different protection actions on the devices in the main circuit of the high-voltage power supply; including: First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply; Second level protection control, DC overcurrent protection control of the power module (5); The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply; The fourth level protection control is the protection control of the high voltage fuse (8) connected to the total DC output of the high voltage power supply main circuit; The fifth level of protection control is the protection control of the remote emergency stop vacuum switch (3).

2. A MW-level high-voltage power supply hierarchical protection control system according to claim 1, characterized in that: One end of the vacuum switch (3) is connected to the power grid, the other end of the vacuum switch (3) is connected to the primary winding of a high-voltage transformer (4), the secondary winding of the high-voltage transformer (4) is connected to a plurality of power modules (5); the total output of the plurality of power modules (5) is connected to a high-voltage fuse (8), the output of the high-voltage fuse (8) is connected to a load.

3. A MW-level high-voltage power supply hierarchical protection control system according to claim 1, characterized in that: The hierarchical protection control system comprises an AC measurement circuit (1), a module current measurement circuit (2), a high-voltage voltage divider and sensor module (7), a high-voltage fuse (8), an emergency stop button (9), a conversion interface (10), a total power supply voltage and current measurement module (11) and a controller (12); An AC measurement circuit (1) is used to measure the incoming current of a vacuum switch (3); A module current measurement circuit (2) for measuring the current of each power module (5); A high-voltage voltage divider and sensor module (7), used for collecting the total output voltage and total current of the power module (5); A high voltage fuse (8) is used as a total DC overcurrent protection control for the main circuit of the high voltage power supply; An emergency stop button (9), which is used for the on-duty personnel to manually operate the emergency stop button (9) to achieve system protection; A conversion interface (10) for converting electrical signals into optical signals; A total power supply voltage and current measurement module (11), used for measuring the total output voltage and total current of the power supply module (5); The controller (12) is used to receive overvoltage signals or overcurrent signals fed back from the AC measurement circuit (1) and the total power supply voltage and current measurement module (11), and to issue different protection control instructions in different levels to perform different protection actions on the devices in the high-voltage power supply main circuit.

4. A MW-level high-voltage power supply hierarchical protection control system according to claim 3, characterized in that: One end of the AC measurement circuit (1) is connected to the vacuum switch (3) and the other end is connected to the controller (12); the module current measurement circuit (2) is arranged inside each power module (5); one end of the high-voltage voltage divider and sensor module (7) is connected to the output of the power module (5) and the other end is connected to the high-voltage fuse (8), and the high-voltage fuse (8) is connected to the load; the other end of the high-voltage voltage divider and sensor module (7) is also connected to the total power supply voltage and current measurement module (11), the total power supply voltage and current measurement module (11) is connected to the conversion interface (10), and the conversion interface (10) is connected to the controller (12); each power module (5) is connected to the conversion interface (10); and the emergency stop button (9) is connected to the vacuum switch (3).

5. A control method for a MW-level high voltage power supply hierarchical protection control system as claimed in any one of claims 1 to 4, characterized in that: The control method includes: The load fault signal, module overcurrent signal, module overvoltage signal, total DC current overcurrent and / or total DC overvoltage signal are used to hierarchically issue different protection control instructions to perform different protection actions on the devices in the main circuit of the high-voltage power supply; different protection controls include: First level protection control: total DC current overcurrent and / or overvoltage protection control of the high voltage power supply; Second level protection control, DC overcurrent protection control of the power module (5); The third level protection control is the AC overcurrent protection control of the main circuit of the high voltage power supply; The fourth level protection control is the protection control of the high voltage fuse (8) connected to the total DC output of the high voltage power supply main circuit; The fifth level of protection control is the protection control of the remote emergency stop vacuum switch (3).

6. The control method according to claim 5, characterized in that: The first level of protection control includes: The total DC overvoltage protection value of each power module in the high-voltage power main circuit is set according to the maximum withstand voltage of the load; the output end of the high-voltage voltage divider in the high-voltage voltage divider and sensor module (7) is connected to the high-voltage DC voltage measurement circuit of the total power voltage and current measurement module (11), and the total voltage value is converted into a digital frequency signal, which is sent to the controller (12) through the conversion interface (10) for calculation to obtain a voltage value; if the voltage value exceeds the total DC overvoltage protection value, the controller (12) sends a blocking pulse, all power modules (5) are blocked, and the high-voltage power output is zero; The total DC overcurrent protection value of each power module in the high-voltage power main circuit is set according to the maximum load current; the output end of the high-voltage sensor in the high-voltage divider and sensor module (7) is connected to the high-voltage DC current measurement circuit of the total power voltage and current measurement module (11), and the total current value is converted into a digital frequency signal, which is sent to the controller (12) through the conversion interface (10) for calculation to obtain the current value; if the current value exceeds the total DC overcurrent protection value, the controller (12) sends a blocking pulse, all power modules (5) are blocked, and the high-voltage power output is zero.

7. The control method according to claim 5, characterized in that: The second level protection control includes: A module current measurement circuit (2) is designed according to the maximum working current of a single power module (5) and a corresponding current sensor is selected; a current measurement protection circuit is designed in the module current measurement circuit (2), the protection value of the current measurement protection circuit is set according to the actual working condition of the power supply, and the current sensor of each power module (5) is consistent with the current measurement protection circuit; when the module current exceeds its protection value, the module current measurement circuit (2) sends a fault signal, blocks the module control pulse, the power module (5) stops working, and the high-voltage power supply outputs zero voltage and current.

8. The control method according to claim 5, characterized in that: The third level protection control includes: According to the operation and use of the high-voltage power supply, an AC transformer and a current relay of the AC measurement circuit (1) are selected to adjust the current value of the current relay; at the same time, an auxiliary node inside the current relay is sent to a controller (12); when the AC current exceeds a preset protection value, the auxiliary node inside the current relay changes and sends a signal to the controller (12), thereby disconnecting the vacuum switch (1).

9. The control method according to claim 5, characterized in that: The fourth level protection control includes: A high-voltage fuse (8) is selected according to the rated output current of the high-voltage power supply; when an abnormal fault short circuit occurs in the entire high-voltage power supply main circuit and the hierarchical protection control system fails to block the power module in time, the fuse in the high-voltage fuse (8) melts to achieve system protection.

10. The control method according to claim 5, characterized in that: The fifth level protection control includes: When the power supply of the hierarchical protection control system is cut off or an emergency occurs in the main circuit of the high-voltage power supply, the on-duty personnel manually operate the emergency stop button (9) to disconnect the vacuum switch (3) to achieve system protection.

Images