Active voltage arc extinction control method, control terminal and active voltage arc extinction device

Abstract

The invention relates to an active voltage arc extinction control method, a control terminal and an active voltage arc extinction device. The method comprises the following steps: acquiring real-time output parameters of a three-phase power distribution network; judging whether the three-phase power distribution network has a fault or not according to the real-time output parameters; when the three-phase power distribution network has a fault, obtaining voltage change data corresponding to three phase lines after the three-phase power distribution network has the fault, and obtaining three pieces of voltage change data; determining a fault phase according to the voltage change data; performing Boolean operation on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix; performing fragment division on the Boolean data matrix to obtain a plurality of Boolean data fragments; calculating the fluctuation activeness of each Boolean data fragment to obtain a plurality of fluctuation activeness; and determining a differential control coefficient according to the plurality of fluctuation activeness. According to the method, the differential control coefficient can be accurately calculated, so that reliable arc extinction is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution network control, and in particular to an active voltage arc extinguishing control method, a control terminal and an active voltage arc extinguishing device. Background Art

[0002] Active voltage arc extinguishing devices are widely used in high-voltage environments such as nuclear power plants, and the arc extinguishing program in existing active voltage arc extinguishing devices usually uses PID algorithm to achieve arc extinguishing control. Its basic principle is to determine the various control coefficients in the PID algorithm by collecting the output voltage of the distribution network. However, in the related art, due to the shortcomings of the existing algorithm for calculating the differential control coefficient, the value of the differential control coefficient is inaccurate, which has an adverse effect on the arc extinguishing effect of the active voltage arc extinguishing device and is not conducive to the safety of nuclear power plants. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an active voltage arc extinguishing control method, a control terminal and an active voltage arc extinguishing device.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing an active voltage arc extinguishing control method, comprising: Obtain real-time output parameters of three-phase distribution network; Determine whether the three-phase power distribution network has a fault according to the real-time output parameters; When a fault occurs in the three-phase distribution network, voltage change data corresponding to three phase lines of the three-phase distribution network after the fault occurs are obtained to obtain three voltage change data; Determine the fault phase according to each of the voltage change data; Performing Boolean operation on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix; Performing segmentation on the Boolean data matrix to obtain a plurality of Boolean data segments; Calculating the fluctuation activity of each of the Boolean data segments to obtain a plurality of fluctuation activities; A derivative control coefficient is determined according to the plurality of fluctuation activities.

[0005] Preferably, the step of determining the fault phase according to each of the voltage change data comprises: Divide each of the voltage change data into segments to obtain segment combinations corresponding to the three phase lines one by one; wherein each segment combination includes a plurality of segments; For each of the fragment combinations: calculating the number of sampling points contained in each fragment of the fragment combination to obtain multiple sample numbers, and generating a frequency matrix corresponding to the fragment combination according to the multiple sample numbers; Determine three determination coefficients corresponding to the three phase lines one by one according to each of the frequency matrices; The phase line corresponding to the largest determination coefficient is determined as the fault phase.

[0006] Preferably, the step of determining three determination coefficients corresponding to the three phase lines one by one according to each of the frequency matrices comprises: The variance of each of the frequency matrices is calculated to obtain three determination coefficients corresponding to the three phase lines.

[0007] Preferably, the step of performing Boolean operation on the voltage change data corresponding to the faulty phase includes: For each sampling point voltage in the voltage change data corresponding to the fault phase, the following steps are performed: comparing the sampling point voltage with the next sampling point voltage; when the sampling point voltage is less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 1; and when the sampling point voltage is not less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 0; Generates a Boolean data matrix from multiple Boolean values.

[0008] Preferably, the step of segmenting the Boolean data matrix comprises: The Boolean data matrix is ​​equally divided into a plurality of segments based on a set span to obtain a plurality of Boolean data segments.

[0009] Preferably, in the step of calculating the fluctuation activity of each of the Boolean data segments, the expression of the fluctuation activity is: ; represents the fluctuation activity of the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the maximum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the minimum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the (p-1)mth Boolean data fragment in the Boolean data matrix corresponding to the Xth, represents the pm-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, and m represents the set span.

[0010] Preferably, the step of determining a differential control coefficient according to the plurality of fluctuation activities comprises: Performing curve fitting on the multiple fluctuation activities to obtain a fitting curve; The slope of the fitting curve is determined to obtain the differential control coefficient.

[0011] Preferably, the step of judging whether the three-phase power distribution network has a fault according to the real-time output parameter comprises: Calculating the zero-sequence voltage according to the real-time output parameter; It is determined whether the zero-sequence voltage is greater than or equal to a threshold voltage. If so, it is determined that a fault exists in the three-phase distribution network.

[0012] The present invention also constructs a control terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the active voltage arc extinguishing control method described above are implemented.

[0013] The present invention also constructs an active voltage arc extinguishing device, including the control terminal mentioned above.

[0014] The technical solution of the present invention monitors the real-time output parameters of the three-phase distribution network, and after determining that the three-phase distribution network has a fault according to the real-time output parameters, collects three voltage change data corresponding to the three phase lines of the three-phase distribution network after the fault occurs, and then determines the fault phase according to each voltage change data, and performs Boolean operations on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix, and then divides the Boolean data matrix to obtain multiple Boolean data segments, and then calculates the fluctuation activity of each Boolean data segment, and finally determines the differential control coefficient according to the multiple fluctuation activities, thereby achieving the technical effect of accurately and efficiently calculating the differential control coefficient, so that the control terminal in the active voltage arc extinguishing device can implement arc extinguishing operation according to a more appropriate differential control coefficient, thereby achieving reliable arc extinguishing, which is helpful to improve the safety of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a program flow chart of an active voltage arc extinguishing control method in some embodiments of the present invention; Figure 2 is a flowchart of step S4 in some embodiments of the present invention; Figure 3 is a circuit structure block diagram of a control terminal in some embodiments of the present invention. DETAILED DESCRIPTION

[0016] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0017] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0018] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices. Figure 1 The present invention is a flowchart of an active voltage arc extinguishing control method in some embodiments of the present invention. The active voltage arc extinguishing control method is applied to a control terminal in an active voltage arc extinguishing device (also called an active intervention type arc extinguishing device), and can accurately calculate a differential control coefficient, so that the control terminal can implement arc extinguishing operation according to a more appropriate differential control coefficient, thereby achieving reliable arc extinguishing.

[0019] See also Figure 1 , the active voltage arc extinguishing control method may include steps S1 to S8.

[0020] Step S1 includes: obtaining the real-time output parameters of the three-phase distribution network. In this step, the real-time output parameters of the three-phase distribution network can be collected through existing equipment. The real-time output parameters can be the real-time voltage values ​​of the three phase lines of the three-phase distribution network. Accordingly, taking the high-voltage bus in a nuclear power plant as an example, the real-time output parameters can be collected in real time through the existing voltage transformer.

[0021] Step S2 includes: judging whether there is a fault in the three-phase distribution network according to the real-time output parameters.

[0022] In some embodiments, it is possible to determine whether a fault exists in the three-phase distribution network based on the real-time output parameters by executing steps S21 and S22.

[0023] Step S21 includes: calculating the zero-sequence voltage according to the real-time output parameter. In this step, when the real-time output parameter includes the real-time voltage values ​​of the three phase lines of the three-phase distribution network, the average value of the real-time voltage values ​​of the three phase lines can be calculated, and the average value is determined as the zero-sequence voltage. Of course, the real-time output parameter can also be a signal such as the three-phase output current, as long as the zero-sequence voltage can be determined by the existing technology.

[0024] Step S22 includes: judging whether the zero-sequence voltage is greater than or equal to the threshold voltage, and if so, judging that there is a fault in the three-phase distribution network. It should be noted that since the working voltage, load, actual working environment, etc. of different distribution networks may be different, and the threshold voltage determines the intervention sensitivity of the active voltage arc extinguishing device, it needs to be carefully selected, resulting in the threshold voltage needing to be adaptively set by the staff in combination with the actual situation, and is not limited here.

[0025] Step S3 includes: when there is a fault in the three-phase distribution network, obtaining voltage change data corresponding to the three phase lines of the three-phase distribution network after the fault occurs, and obtaining three voltage change data. In this step, the collection range of the voltage change data can be 20 cycles, that is, after determining that there is a fault in the three-phase distribution network, the voltage transformer can be used to collect 20 cycle voltage signals corresponding to the three phase lines after the fault is determined, thereby obtaining three voltage change data.

[0026] Further, when there is no fault in the three-phase distribution network, the process may return to step S1 to monitor in real time whether there is a fault in the three-phase distribution network.

[0027] Step S4 includes: determining the fault phase according to each voltage change data.

[0028] In some embodiments, Figure 2 As shown, the faulty phase can be determined by executing steps S41 to S44.

[0029] Step S41 includes: dividing each voltage change data into segments to obtain segment combinations corresponding to the three phase lines one by one; wherein each segment combination includes a plurality of segments.

[0030] It should be noted that in the related art, when collecting voltage change data, the existing voltage measurement equipment (such as voltage transformer) will collect voltage based on a certain frequency, so the three voltage change data may include a matrix ,matrix and matrix , Indicates the voltage change data of phase A. Indicates the voltage change data of phase B line, represents the voltage change data of phase C, and i represents the number of sampling points in the voltage change data. Accordingly, the three voltage change data can be expressed as: ={ }, ={ }, ={ }. Represents the sampling point voltage in the voltage change data of phase A line, Indicates the voltage at the sampling point in the voltage change data of phase B line, represents the sampling point voltage in the voltage change data of phase C. It should be noted that in the matrix ,matrix and matrix In the example, the larger the sampling point voltage sequence number (1, 2, ...i) is, the later the sampling time is.

[0031] Furthermore, the step of dividing each voltage change data into segments may include: dividing each voltage change data into segments with equal widths based on a set width to obtain segment combinations corresponding to the three phase lines one by one.

[0032] Specifically, with A phase line or matrix For example, assuming the width is , then in the matrix In [0, ) interval belongs to the first segment of the sampling point voltage, all in [ , ) interval belongs to the elements of the second segment, ..., all the sampling point voltages in [ , ) The sampling point voltages in the interval belong to the elements in the hth segment. and matrix The partitioning process and matrix The principle of the division process is the same, please refer to the above, and I will not repeat it here. In addition, the staff can customize the settings according to actual needs size.

[0033] Step S42 includes: for each segment combination, calculating the number of sampling points contained in each segment of the segment combination to obtain multiple sample numbers, and generating a frequency matrix corresponding to the segment combination according to the multiple sample numbers.

[0034] Specifically, with A phase line or matrix As an example, the number of sampling points (i.e., the number of elements) included in the first fragment is recorded as , the number of sampling points included in the second segment is recorded as ,…, the number of sampling points (i.e., the number of elements) included in the hth segment is recorded as ,pass , , …, The frequency matrix corresponding to the combination of line segments constituting phase A It should be noted that the specific division schemes of the segment combinations of other phase lines are based on the same principle as the division scheme of the segment combination of phase A, so please refer to the above and will not be repeated here.

[0035] Step S43 includes: determining three determination coefficients corresponding to the three phase lines one by one according to each frequency matrix.

[0036] In some embodiments, three determination coefficients may be determined by performing the following steps: calculating the variance of each frequency matrix to obtain three determination coefficients corresponding to the three phase lines. In this embodiment, the specific calculation method of the variance is referred to the prior art and will not be described in detail here.

[0037] Step S44 includes: determining the phase line corresponding to the largest determination coefficient as the fault phase. It is easy to understand that this embodiment uses the variance as the determination coefficient of a phase line, taking advantage of the fact that the variance can accurately determine the degree of discreteness, and the voltage fluctuation amplitude of the fault phase is the largest (that is, the degree of discreteness is the largest in theory), and determines the fault phase where the ground fault occurs (A phase line, B phase line or C phase line) by the size of the determination coefficient, which has the advantages of high accuracy and easy implementation.

[0038] Step S5 includes: performing Boolean operation on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix.

[0039] In some embodiments, the step of performing Boolean operations on the voltage change data corresponding to the faulty phase may include: performing operations on each sampling point voltage in the voltage change data corresponding to the faulty phase: comparing the sampling point voltage with the next sampling point voltage; when the sampling point voltage is less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 1; when the sampling point voltage is not less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 0; and generating a Boolean data matrix based on multiple Boolean values.

[0040] Specifically, with A phase line or matrix For example, and Compare and get Boolean value ; and Compare and get Boolean value ;…; and , corresponding to Boolean value ; The Boolean data matrix of phase A is finally expressed as: It should be noted that the specific determination scheme of the Boolean data matrix of other phase lines is the same as the determination scheme of the Boolean data matrix of phase A, so it can be referred to above and will not be repeated here.

[0041] Step S6 includes: dividing the Boolean data matrix into segments to obtain a plurality of Boolean data segments.

[0042] In some embodiments, the Boolean data matrix may be segmented by executing the following steps: the Boolean data matrix is ​​equally divided into a plurality of segments based on a set span to obtain a plurality of Boolean data segments.

[0043] Specifically, with A phase line or matrix For example, assuming the span is set to m, then the Boolean data fragment It can be expressed as: . Boolean data snippet It can be expressed as: }. Boolean data fragment It can be expressed as: It should be noted that the principle of dividing the Boolean data matrix fragments of other phase lines is the same as the principle of dividing the Boolean data matrix fragments of phase line A, so please refer to the above and will not be repeated here.

[0044] Step S7 includes: calculating the fluctuation activity of each Boolean data segment to obtain multiple fluctuation activities.

[0045] In some embodiments, the expression for calculating the fluctuation activity of the Boolean data segment using the fluctuation activity is: .

[0046] represents the fluctuation activity of the pth Boolean data fragment in the Boolean data matrix corresponding to the Xth, represents the maximum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the minimum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the (p-1)mth Boolean data fragment in the Boolean data matrix corresponding to the Xth, Represents the pm-th Boolean data fragment in the Boolean data matrix corresponding to the X-th.

[0047] Step S8 includes: determining a differential control coefficient according to a plurality of fluctuation activities.

[0048] In some embodiments, the differential control coefficient can be determined by performing the following steps: curve fitting is performed on multiple fluctuation activities to obtain a fitting curve; and the slope of the fitting curve is determined to obtain the differential control coefficient. In this embodiment, curve fitting can be performed on multiple fluctuation activities by using an existing algorithm, and the slope of the fitting curve can be determined.

[0049] Furthermore, step S8 may also include: performing arc extinguishing operation according to a differential control coefficient.

[0050] It is easy to understand that the technical solution of the present invention monitors the real-time output parameters of the three-phase distribution network, and after determining that the three-phase distribution network has a fault based on the real-time output parameters, collects three voltage change data corresponding to the three phase lines of the three-phase distribution network after the fault occurs, and then determines the fault phase based on each voltage change data, and performs Boolean operations on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix, and then divides the Boolean data matrix to obtain multiple Boolean data segments, and then calculates the fluctuation activity of each Boolean data segment, and finally determines the differential control coefficient based on the multiple fluctuation activities, thereby achieving the technical effect of accurately and efficiently calculating the differential control coefficient, so that the control terminal in the active voltage arc extinguishing device can implement arc extinguishing operation according to a more appropriate differential control coefficient, thereby achieving reliable arc extinguishing, which helps to improve the safety of nuclear power plants.

[0051] like Figure 3 As shown, the present invention also provides a control terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the active voltage arc extinguishing control method provided in an embodiment of the present invention are implemented.

[0052] In addition, the present invention also provides an active voltage arc extinguishing device, including the control terminal provided by an embodiment of the present invention.

[0053] It should be noted that the active voltage arc extinguishing device can be an existing active voltage arc extinguishing device based on the PID algorithm. The main purpose of the present invention is to optimize the calculation method of the differential control coefficient in the PID algorithm. For the specific structure and arc extinguishing control principle of the active voltage arc extinguishing device, please refer to the prior art and will not be repeated here.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0056] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0057] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. An active voltage arc extinguishing control method, characterized in that: include: Obtain real-time output parameters of three-phase distribution network; Determine whether the three-phase power distribution network has a fault according to the real-time output parameters; When a fault occurs in the three-phase distribution network, voltage change data corresponding to three phase lines of the three-phase distribution network after the fault occurs are obtained to obtain three voltage change data; Determine the fault phase according to each of the voltage change data; Performing Boolean operation on the voltage change data corresponding to the fault phase to obtain a Boolean data matrix; Performing segmentation on the Boolean data matrix to obtain a plurality of Boolean data segments; Calculating the fluctuation activity of each of the Boolean data segments to obtain a plurality of fluctuation activities; A derivative control coefficient is determined according to the plurality of fluctuation activities.

2. The active voltage arc extinguishing control method according to claim 1, characterized in that: The step of determining the fault phase according to each of the voltage change data comprises: Divide each of the voltage change data into segments to obtain segment combinations corresponding to the three phase lines one by one; wherein each segment combination includes a plurality of segments; For each of the fragment combinations: calculating the number of sampling points contained in each fragment of the fragment combination to obtain multiple sample numbers, and generating a frequency matrix corresponding to the fragment combination according to the multiple sample numbers; Determine three determination coefficients corresponding to the three phase lines one by one according to each of the frequency matrices; The phase line corresponding to the largest determination coefficient is determined as the fault phase.

3. The active voltage arc extinguishing control method according to claim 2, characterized in that: The step of determining three determination coefficients corresponding to the three phase lines one by one according to each of the frequency matrices comprises: The variance of each of the frequency matrices is calculated to obtain three determination coefficients corresponding to the three phase lines.

4. The active voltage arc extinguishing control method according to claim 1, characterized in that: The step of performing Boolean operation on the voltage change data corresponding to the fault phase comprises: For each sampling point voltage in the voltage change data corresponding to the fault phase, the following steps are performed: comparing the sampling point voltage with the next sampling point voltage; when the sampling point voltage is less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 1; and when the sampling point voltage is not less than the next sampling point voltage, setting the Boolean value corresponding to the sampling point voltage to 0; Generates a Boolean data matrix from multiple Boolean values.

5. The active voltage arc extinguishing control method according to claim 4, characterized in that: The step of segmenting the Boolean data matrix comprises: The Boolean data matrix is ​​equally divided into a plurality of segments based on a set span to obtain a plurality of Boolean data segments.

6. The active voltage arc extinguishing control method according to claim 5, characterized in that: In the step of calculating the fluctuation activity of each Boolean data segment, the expression of the fluctuation activity is: ； represents the fluctuation activity of the pth Boolean data fragment in the Boolean data matrix corresponding to the Xth, represents the maximum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the minimum value in the p-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, represents the (p-1)mth Boolean data fragment in the Boolean data matrix corresponding to the Xth, represents the pm-th Boolean data fragment in the Boolean data matrix corresponding to the X-th, and m represents the set span.

7. The active voltage arc extinguishing control method according to claim 5, characterized in that: The step of determining the differential control coefficient according to the plurality of fluctuation activities comprises: Performing curve fitting on the multiple fluctuation activities to obtain a fitting curve; The slope of the fitting curve is determined to obtain the differential control coefficient.

8. The active voltage arc extinguishing control method according to any one of claims 1 to 7, characterized in that: The step of judging whether the three-phase power distribution network has a fault according to the real-time output parameters comprises: Calculating the zero-sequence voltage according to the real-time output parameter; It is determined whether the zero-sequence voltage is greater than or equal to a threshold voltage. If so, it is determined that a fault exists in the three-phase distribution network.

9. A control terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the active voltage arc extinguishing control method according to any one of claims 1 to 8 are implemented.

10. An active voltage arc extinguishing device, characterized in that: Comprising the control terminal as claimed in claim 9.

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