Zero-loss depth current limiting device and current adaptive adjustment method

Abstract

The invention provides a zero-loss deep current limiting device and a current self-adaptive adjusting method, and relates to the technical field of power systems, the zero-loss deep current limiting device comprises a current limiting reactor and a high-speed switch, and the current limiting reactor is connected with the high-speed switch in parallel; the zero-loss deep current limiting device further comprises an offset zero-crossing module, and the offset zero-crossing module is connected to the high-speed switch in parallel. The offset zero-crossing module comprises a high-frequency current source and a power supply controller, and the high-frequency current source and the power supply controller are connected in series and then connected to the high-speed switch in parallel. The high-speed switch is switched on when the circuit normally operates, and the current in the circuit does not need to pass through the current limiting reactor, so that the reactive power loss of the electric quantity in the circuit is reduced. When short-circuit fault current is monitored in the circuit, the high-speed switch is quickly switched off, and the current in the circuit flows through the current limiting reactor, so that the damage to the whole power system caused by short circuit is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a zero-loss deep current limiting device and a current adaptive regulation method. Background Art

[0002] With the development of economy, the electric load has also increased dramatically, and the voltage quality problems caused by medium and high voltage long-distance transmission lines have gradually been exposed. For areas with low population density, the power supply radius is large and the transmission lines are generally long. In the early days when the load was light, the receiving end voltage could still meet the use demand; but with the progress of society and economic development, the number of heavy load users has continued to increase, and the voltage drop of load current on the line has increased significantly, causing the power supply voltage quality to the load to seriously exceed the standard.

[0003] In the power system, short circuit fault is a common type of power system fault. The short circuit current is generally dozens or even hundreds of times the rated current.

[0004] Generally speaking, by connecting the current limiting reactor in series to the power transmission circuit of the power system, the short-circuit current intensity can be effectively reduced, the impact of the short-circuit current on the electrical equipment in the power system can be reduced, and the bus voltage can be maintained. However, the series current limiting reactor will generate a large amount of reactive power loss, increase the power consumption burden of users, and also cause problems such as a decrease in the voltage at the user end. Summary of the invention

[0005] In order to reduce the reactive loss of a current limiting reactor, the present application provides a zero-loss deep current limiting device and a current adaptive regulation method.

[0006] In a first aspect, the present application provides a zero-loss deep current limiting device, which adopts the following technical solution: A zero-loss deep current limiting device, the zero-loss deep current limiting device comprising a current limiting reactor and a high-speed switch, wherein the current limiting reactor is connected in parallel with the high-speed switch; The zero-loss deep current limiting device also includes a zero-crossing offset module, and the zero-crossing offset module is connected in parallel to the high-speed switch; The zero-crossing compensation module comprises a high-frequency current source and a power controller. The high-frequency current source and the power controller are connected in series and then in parallel to the high-speed switch.

[0007] Optionally, the zero-loss deep current limiting device further includes a zinc oxide arrester, which is connected in parallel to the zero-crossing compensation module.

[0008] In the second aspect, the present application also provides a current adaptive regulation method for a zero-loss deep current limiting device, which adopts the following technical solution: A method for adaptively regulating current of a zero-loss deep current limiting device, using the zero-loss deep current limiting device described in any one of claims 1 to 2, the method comprising: Obtaining historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, wherein the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch to trip after troubleshooting; The current device tripping current of the high-speed switch is adjusted according to the plurality of historical tripping fault feedback information.

[0009] Optionally, adjusting the current device tripping current of the high-speed switch according to the plurality of historical tripping fault feedback information includes: According to the plurality of historical trip fault feedback information, capturing the number of historical erroneous trips of the high-speed switch and the target historical fault trip currents of the plurality of erroneous trips; If the number of historical false tripping events is greater than a preset false tripping threshold, the current device tripping current of the high-speed switch is adjusted according to a plurality of target historical fault tripping currents.

[0010] Optionally, the method further includes: Receiving cycle division information input by a user, the cycle division information including a cycle duration and a plurality of distribution time periods divided in the cycle; According to the cycle division information, the target historical fault tripping current in the same distribution time period in multiple cycles is obtained, and according to the target historical fault tripping current in the same distribution time period in multiple cycles, the device tripping current corresponding to the distribution time period is adjusted.

[0011] Optionally, the adjusting the current device tripping current of the high-speed switch according to the plurality of historical mis-tripping currents further includes: The historical number of erroneous trips is updated to a preset initial number of erroneous trips.

[0012] In a third aspect, the present application provides a zero-loss deep current limiting device adaptive opening current regulation system, which adopts the following technical solution: A zero-loss deep current limiting device adaptive opening current regulation system, the system includes an intelligent terminal, the intelligent terminal includes: An information acquisition module, used to obtain historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, wherein the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch to trip after troubleshooting; The device trip current adjustment module is used to adjust the current device trip current of the high-speed switch according to the plurality of historical trip fault feedback information.

[0013] In a fourth aspect, the present application provides an intelligent terminal, which adopts the following technical solution: A smart terminal comprises a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement the processing of the current adaptive regulation method of the zero-loss deep current limiting device as described in the second aspect.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution: A computer-readable storage medium, wherein at least one instruction, at least one program, code set or instruction set is stored in the storage medium, wherein the at least one instruction, the at least one program, the code set or instruction set is loaded and executed by a processor to implement the processing of the current adaptive regulation method of the zero-loss deep current limiting device as described in the second aspect.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: When the high-speed switch is closed under normal circuit operation, the current in the circuit does not need to pass through the current-limiting reactor, thereby reducing the reactive power loss in the circuit. When a short-circuit fault current is detected in the circuit, the high-speed switch quickly opens, and the current in the circuit flows through the current-limiting reactor, reducing the damage to the entire power system caused by the short circuit. Furthermore, when the high-speed switch opens when a short-circuit fault current is detected, the high-frequency current source and the power controller cooperate with each other to generate an instantaneous current in the opposite direction of the high-speed switch, so as to generate a zero-crossing point on the contacts of the high-speed switch, reducing the arc that may be generated during the opening process of the high-speed switch; By collecting the historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, the equipment tripping current of the high-speed switch in the current zero-loss deep current limiting device is adjusted to reduce the possibility of misoperation of the high-speed switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a circuit diagram of a zero-loss deep current limiting device provided in an embodiment of the present application.

[0018] Figure 2 It is a flow chart of a current adaptive regulation method of a zero-loss deep current limiting device provided in an embodiment of the present application.

[0019] Figure 3 It is a system block diagram of an adaptive trip current regulation system of a zero-loss deep current limiting device provided in an embodiment of the present application.

[0020] Figure 4 It is a structural block diagram of a smart terminal provided in an embodiment of the present application.

[0021] Explanation of the reference numerals: 1. Current limiting reactor; 2. High-speed switch; 3. Zero-crossing compensation module; 31. High-frequency current source; 32. Power supply controller; 4. Zinc oxide lightning arrester; 201. Information acquisition module; 202. Equipment tripping current regulation module. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with Figures 1-4.

[0023] The present application embodiment provides a zero-loss deep current limiting device, such as Figure 1 As shown, the zero-damage current limiting device includes a current limiting reactor 1, a high-speed switch 2, a zero-crossing compensation module 3 and a zinc oxide arrester 4.

[0024] The current limiting reactor 1 is connected in parallel with the high-speed switch 2 , and the high-speed switch 2 may be a high-speed eddy current switch, a mechanical high-speed switch 2 , a combined high-speed switch 2 , or the like.

[0025] When the circuit is in normal operation, the high-speed switch 2 is closed, and the current in the circuit does not need to pass through the current-limiting reactor 1, thereby reducing the reactive power loss of the circuit. When a short-circuit fault current is detected in the circuit, the high-speed switch 2 is quickly opened, and the current in the circuit flows through the current-limiting reactor 1, reducing the damage to the entire power system caused by the short circuit.

[0026] The zero-crossing compensation module 3 is connected in parallel to the high-speed switch 2 . The zero-crossing compensation module 3 includes a high-frequency current source 31 and a power controller 32 . The high-frequency current source 31 and the power controller 32 are connected in series, and the series-connected high-frequency current source 31 and the power controller 32 are connected in parallel to the high-speed switch 2 .

[0027] When the high-speed switch 2 is opening due to a short-circuit fault current, the high-frequency current source 31 and the power controller 32 cooperate with each other, and when the contact distance of the high-speed switch 2 reaches the rated opening distance, an instantaneous current in the opposite direction to that on the high-speed switch 2 is generated, so as to generate a zero crossing point on the contacts of the high-speed switch 2, thereby reducing the arc that may be generated during the opening process of the high-speed switch 2.

[0028] The zinc oxide lightning arrester 4 is connected in parallel to the zero-crossing compensation module 3, so as to enable the zero-crossing compensation module 3 to absorb the short-circuit energy of the circuit through its own energy absorption array when the high-speed switch 2 creates an artificial zero-crossing point.

[0029] In another feasible manner, the high-frequency current source 31 may be a capacitor. When the circuit is in normal operation, the high-speed switch 2 is closed and the capacitor is charged to the rated voltage. When a short-circuit fault occurs, the high-speed switch 2 is opened and the contact spacing reaches the rated opening distance. The power controller 32 and the capacitor cooperate with each other to generate a reverse high-frequency current with an amplitude equivalent to the instantaneous value of the short-circuit current, and superimpose it on the high-speed switch 2, so that the high-speed switch 2 completes the short-circuit current breaking. Thereafter, the short-circuit current is transferred to the zinc oxide lightning arrester 4 and charges the capacitor.

[0030] When the capacitor voltage tends to be stable and reaches the residual voltage of the zinc oxide lightning arrester 4, the zinc oxide lightning arrester 4 is turned on and the power controller 32 is turned off. Thereafter, the zinc oxide lightning arrester 4 continuously absorbs the short-circuit current energy. When the current passes through zero, the zinc oxide lightning arrester 4 is turned off and the current limiting reactor 1 is completely in the fault circuit.

[0031] The present application also provides a method for adaptively regulating current of a zero-loss deep current limiting device, which can be applied to the above-mentioned zero-loss deep current limiting device. The executor of the method can be an intelligent terminal for recording and summarizing data of the zero-loss deep current limiting device. The intelligent terminal can be installed in the zero-loss deep current limiting device, or on the outside of the zero-loss current limiting device, such as in the edge box of the zero-loss current limiting device, or in a remote server.

[0032] The embodiment of the present application takes the analysis between the opening current and the opening fault of the high-speed switch 2 in the zero-loss deep current limiting device as an example for explanation. Other situations are similar and will not be described in detail.

[0033] The following will be combined with specific implementation methods. Figure 2 The processing flow shown is described in detail, and the content can be as follows: Step S101, obtaining historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, wherein the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch 2 to trip after troubleshooting.

[0034] During implementation, the intelligent terminal obtains the historical fault tripping current and historical tripping fault feedback information of the current zero-loss deep current limiting device from its own storage database or network storage database, wherein the historical tripping fault feedback information is used to record the fault cause and fault type that caused the high-speed switch 2 to trip after fault troubleshooting.

[0035] For example, under a certain fault current, the fault causes that cause the high-speed switch to open 2 may be short circuit of electrical equipment, short circuit of transmission line, access of large load, etc., and the corresponding fault types are short circuit fault, short circuit fault and large load access fault.

[0036] Step S102, adjusting the current device tripping current of the high-speed switch 2 according to the historical tripping fault feedback information.

[0037] In implementation, the intelligent terminal summarizes multiple historical trip fault feedback information to facilitate screening out the fault type of identification error, such as large load access fault, and then adjusts the current device trip current of the high-speed switch 2 with the historical fault trip current corresponding to the identified fault type. Here, the current device trip current of the high-speed switch 2 can be the maximum erroneous trip current in multiple erroneous trip processes.

[0038] Optionally, in step S102, there is also the following processing, and the specific operation flow is as follows: According to the feedback information of multiple historical trip faults, the historical number of wrong trips of the high-speed switch 2 and the target historical fault trip currents of the multiple wrong trips are captured; If the number of historical false tripping events is greater than a preset false tripping threshold, the current device tripping current of the high-speed switch 2 is adjusted according to a plurality of target historical fault tripping currents.

[0039] During implementation, the intelligent terminal divides the number of erroneous tripping operations of the high-speed switch 2 according to the fault type in the historical tripping fault feedback information, which is referred to as the historical erroneous tripping number, and simultaneously screens the historical fault tripping current of each erroneous tripping operation, which is referred to as the target historical fault tripping current.

[0040] Then the intelligent terminal compares the number of historical false trips with the preset false trip threshold, so as to determine whether the current false trip occurs frequently. When the number of historical false trips is greater than the false trip threshold, the intelligent terminal adjusts the current device trip current of the high-speed switch 2 with the target historical fault trip current. The current device trip current of the high-speed switch 2 here can be the largest target historical fault trip current in multiple false trip processes.

[0041] Optionally, receiving cycle division information input by a user, the cycle division information including the cycle duration and a plurality of distribution time periods divided in the cycle; According to the cycle division information, the target historical fault tripping current in the same distribution period in multiple cycles is obtained, and according to the target historical fault tripping current in the same distribution period in multiple cycles, the device tripping current in the corresponding distribution period is adjusted.

[0042] During implementation, the smart terminal receives cycle division information input by the user, where the cycle division information includes the cycle duration and multiple distribution time periods divided in each cycle. For example, if the cycle is 1 year, the distribution time period can be each season in the four seasons of the year.

[0043] Then the intelligent terminal obtains multiple target historical fault currents in the same distribution period in multiple cycles, and further adjusts the device tripping current in the corresponding distribution period with the target historical fault tripping current in the same distribution period in multiple cycles, so that the device tripping current in different distribution periods is different, reducing the possibility of the environment misjudging the tripping of the high-speed switch 2.

[0044] Optionally, in this application, there is also the following processing, and the specific operation process is as follows: Acquire multiple historical device tripping currents of the high-speed switch 2, and generate tripping current adjustment information according to the multiple historical device tripping currents; Receive the ideal decay information of the opening current input by the user, and generate the pre-adjusted opening current according to the opening current adjustment information and the ideal decay information of the opening current.

[0045] During implementation, the intelligent terminal first obtains multiple historical device trip currents of the high-speed switch 2, and generates trip current adjustment information based on the historical device trip currents. It can also distinguish the historical device trip currents in the same distribution time period in multiple cycles, and generate multiple trip current adjustment information corresponding to different distribution time periods. Here, only the high-speed switch 2 generates a corresponding trip current adjustment information as an example.

[0046] At the same time, the intelligent terminal receives the ideal decay information of the opening current input by the user. The ideal decay information of the opening current here is used to reflect the change of the equipment opening current of the high-speed switch 2 over time. During the long-term operation of the zero-damage current limiting device and the circuit equipment, the equipment opening current also needs to be adjusted appropriately. The ideal decay information of the opening current here can be derived from the information records of other zero-damage current limiting devices, or from the records of aging tests.

[0047] Furthermore, the intelligent terminal analyzes the current opening current adjustment of the high-speed switch 2 and compares it with the ideal decay information of the opening current, and then derives a pre-adjusted opening current, and then generates the device opening current that needs to be adjusted for the high-speed switch 2 by solving the mean of the pre-adjusted opening current and the device opening current adjusted in step S102.

[0048] Specifically, the climbing coefficient can be calculated by obtaining the difference between the two most recently adjusted device trip currents and dividing it by the difference between the device trip currents in the ideal decay information of the trip current at the same time. Then, the adjustment time difference between the current and the most recent adjustment time of the device trip current is calculated, and then the target time of the zero-loss deep current limiting device under the same usage time at the current time is marked in the ideal decay information of the trip current. Next, the difference between the device trip current within the adjustment time difference before the target time in the ideal decay information of the trip current is obtained, and the obtained difference is multiplied by the climbing coefficient to obtain the pre-adjusted trip current.

[0049] Optionally, after step S102, there is the following processing, and the specific operation flow is as follows: Update the historical number of false trips to the preset initial number of false trips.

[0050] In implementation, after adjusting the device tripping current of the high-speed switch 2, the intelligent terminal updates the currently recorded number of historical erroneous tripping times to the initial number of erroneous tripping times, where the initial number of erroneous tripping times can be set to zero.

[0051] The embodiment of the present application also discloses a loss current limiting device adaptive opening current regulation system, the system includes an intelligent terminal, the intelligent terminal includes: An information acquisition module 201 is used to obtain historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, where the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch 2 to trip after troubleshooting; The device tripping current regulating module 202 is used to regulate the current device tripping current of the high-speed switch 2 according to a plurality of historical tripping fault feedback information.

[0052] Optional, intelligent terminal, specifically used for: The data statistics processing module 203 is used to capture the historical wrong tripping times of the high-speed switch 2 and the target historical fault tripping currents of the wrong tripping according to the feedback information of the multiple historical tripping faults; If the number of historical false tripping events is greater than a preset false tripping threshold, the current device tripping current of the high-speed switch 2 is adjusted according to a plurality of target historical fault tripping currents.

[0053] Optionally, the smart terminal can also be used to: The information acquisition module 201 is used to receive the cycle division information input by the user, where the cycle division information includes the cycle duration and a plurality of distribution time periods divided in the cycle; The device tripping current regulating module 202 is used to obtain the target historical fault tripping current in the same distribution period in multiple cycles according to the period division information, and adjust the device tripping current in the corresponding distribution period according to the target historical fault tripping current in the same distribution period in multiple cycles.

[0054] Optionally, the smart terminal can also be used to: The information updating module 204 is used to update the historical number of erroneous tripping to a preset initial number of erroneous tripping.

[0055] Figure 4 : is a schematic diagram of the structure of the intelligent terminal provided in the embodiment of the present application. The intelligent terminal may have relatively large differences due to different configurations or performances, and may include one or more central processing units (for example, one or more processors) and memories, and one or more storage media for storing applications or data (for example, one or more mass storage devices). Among them, the memory and the storage medium may be temporary storage or permanent storage. The program stored in the storage medium may include one or more modules (not shown in the figure), and each module may include a series of instruction operations in the intelligent terminal.

[0056] The intelligent terminal may also include one or more power supplies, one or more wired or wireless network interfaces, one or more input and output interfaces, one or more keyboards, and / or one or more operating systems.

[0057] The intelligent terminal may include a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by one or more processors. The one or more programs include the processing of the intelligent terminal in the above-mentioned zero-loss deep current limiting device current adaptive regulation method.

[0058] A person skilled in the art will appreciate that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, etc.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

[0060] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A zero-loss deep current limiting device, characterized in that: The zero-loss deep current limiting device comprises a current limiting reactor and a high-speed switch, wherein the current limiting reactor is connected in parallel with the high-speed switch; The zero-loss deep current limiting device also includes a zero-crossing offset module, and the zero-crossing offset module is connected in parallel to the high-speed switch; The zero-crossing compensation module comprises a high-frequency current source and a power controller. The high-frequency current source and the power controller are connected in series and then in parallel to the high-speed switch.

2. The device according to claim 1, characterized in that: The zero-loss deep current limiting device also includes a zinc oxide lightning arrester, which is connected in parallel to the zero-crossing compensation module.

3. A method for adaptively regulating current of a zero-loss deep current limiting device, using the zero-loss deep current limiting device according to any one of claims 1 to 2, characterized in that: The method comprises: Obtaining historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, wherein the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch to trip after troubleshooting; The current device tripping current of the high-speed switch is adjusted according to the plurality of historical tripping fault feedback information.

4. The method according to claim 3, characterized in that The step of adjusting the current device tripping current of the high-speed switch according to the plurality of historical tripping fault feedback information comprises: According to the plurality of historical trip fault feedback information, capturing the number of historical erroneous trips of the high-speed switch and the target historical fault trip currents of the plurality of erroneous trips; If the number of historical false tripping events is greater than a preset false tripping threshold, the current device tripping current of the high-speed switch is adjusted according to a plurality of target historical fault tripping currents.

5. The method according to claim 4, characterized in that: The method further comprises: Receiving cycle division information input by a user, the cycle division information including a cycle duration and a plurality of distribution time periods divided in the cycle; According to the cycle division information, the target historical fault tripping current in the same distribution time period in multiple cycles is obtained, and according to the target historical fault tripping current in the same distribution time period in multiple cycles, the device tripping current corresponding to the distribution time period is adjusted.

6. The method according to claim 3, characterized in that The method further comprises: adjusting the current device tripping current of the high-speed switch according to the plurality of historical mis-tripping currents; and then: The historical number of erroneous trips is updated to a preset initial number of erroneous trips.

7. A zero-loss deep current limiting device adaptive opening current regulation system, characterized in that: The system includes an intelligent terminal, and the intelligent terminal includes: An information acquisition module, used to obtain historical fault tripping current and historical tripping fault feedback information of the zero-loss deep current limiting device, wherein the historical tripping fault feedback information is used to record the fault type and fault cause that caused the high-speed switch to trip after troubleshooting; The device trip current adjustment module is used to adjust the current device trip current of the high-speed switch according to the plurality of historical trip fault feedback information.

8. An intelligent terminal, characterized in that: The intelligent terminal includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement the processing of the current adaptive regulation method of the zero-loss deep current limiting device as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement the processing of the current adaptive regulation method of the zero-loss deep current limiting device as described in any one of claims 1 to 6.

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