CN113325264B - Power distribution network fault protection method based on self-adaptive differential grounding algorithm - Google Patents
Power distribution network fault protection method based on self-adaptive differential grounding algorithm Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention relates to a power distribution network fault protection method based on a self-adaptive difference grounding algorithm, which is characterized by comprising the following steps of: installing an edge calculating device at each monitoring point of each feeder line of the medium-voltage distribution line, taking any one power distribution room as a central monitoring point, and installing a central edge calculating device; collecting three-phase transient current signals on a line, processing the signals, judging whether a ground fault occurs by adopting a self-adaptive differential grounding algorithm, and uploading the result to a central edge computing device; positioning a ground fault section; and issuing a tripping command to a related breaker of the feeder line with the ground fault to finish fault line isolation, and issuing a closing command to a contact switch to realize recovery of power supply in a non-fault area. The method solves the problems of difficult implementation, high installation cost, inflexible field implementation, larger error caused by environmental influence, difficult guarantee of accuracy and the like of the existing ground fault positioning method.
Description
Technical Field
The invention relates to the technical field of distribution automation, in particular to a power distribution network line ground fault positioning, ground fault isolation and protection method based on a self-adaptive differential grounding algorithm.
Background
The distribution network in China mostly adopts a neutral point non-effective grounding mode, when a line generates a single-phase grounding fault, the fault characteristic current is weak, and the accurate positioning of the position of a grounding point and the isolation of the fault are long-standing technical problems. The main technical scheme at present comprises a transient zero-sequence current earth fault positioning algorithm, a zero-sequence voltage derivative and zero-sequence current polarity characteristic value algorithm.
The invention patent with publication number CN109507529B discloses a small current earth fault distinguishing and positioning method based on a fault indicator, which comprises that an acquisition unit synchronizes time; the acquisition unit synchronously triggers and acquires current and voltage; calculating derivative values of zero-sequence current, zero-sequence voltage and zero-sequence voltage to time; calculating transient polarity characteristic values of zero sequence current transient polarity characteristic values and zero sequence voltage to time derivative values at fault moments; calculating the small current grounding fault characteristic value of each fault indicator and judging whether a fault occurs; and positioning the position of the small-current ground fault.
The invention patent application with the publication number of CN112415325A discloses a single-phase earth fault section identification method based on edge calculation, which is suitable for being used for fault analysis of a power grid power system. Firstly, measuring points are accurately set on each branch of a power grid system, edge calculation nodes are configured at the head ends of corresponding lines, the distance between the measuring nodes is defined as a section, when a single-phase earth fault occurs on the branch, the measuring nodes record and upload zero sequence current amplitude values to the edge calculation nodes, difference value calculation is carried out by using zero sequence current signals, finally a matrix is generated, and then the difference value of adjacent numerical values in the matrix is utilized to judge that the fault occurs at the measuring points on the corresponding branches. The method applies edge calculation, carries out fault section identification according to the difference of the zero sequence current amplitude values of the fault line and the non-fault line along the line, and determines the fault section.
The technical scheme disclosed by the two technical documents has the following problems:
1) a transient zero-sequence current ground fault positioning algorithm is adopted, monitoring terminals are required to be installed on a circuit, each monitoring terminal uploads a zero-sequence current recording file to a main station for comprehensive judgment, and the main station compares the zero-sequence current phase with the amplitude of each monitoring point to calculate the grounding position. The algorithm requires that the wave recording files of the monitoring terminal are accurate, the requirement on the clock accuracy of each wave recording file is extremely high, the monitoring terminal and the master station are different manufacturers during project implementation, and a responsible party is difficult to judge when inaccurate positioning occurs, so that the project implementation is difficult, and the actual operation effect is poor.
2) By adopting a zero sequence voltage derivative and zero sequence current polarity characteristic value algorithm, data are not required to be uploaded to a main station for judgment, but a zero sequence voltage sensor is required to be installed on monitoring equipment depending on the acquisition of zero sequence voltage, the installation cost of the zero sequence voltage sensor is high, the field implementation is inflexible, the zero sequence voltage sensor is not suitable for batch application, and the acquisition and synthesis of the zero sequence voltage by an electric field induction mode are also available, but the electric field induction is easily influenced by the environment, the error is large, and the accuracy is difficult to ensure.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for positioning, isolating and protecting the ground fault of the power distribution network line, which can avoid the problems that in the existing technical scheme for positioning and isolating the ground fault of the power distribution network, the transient zero-sequence current ground fault positioning method has extremely high requirements on the accuracy of a wave recording file of a monitoring terminal and the accuracy of a clock of each wave recording file, is difficult to implement, and a zero-sequence voltage derivative and zero-sequence current polarity characteristic value method depends on the acquisition of zero-sequence voltage, so that a zero-sequence voltage sensor must be installed on monitoring equipment, so that the installation cost is high, the field implementation is inflexible, the method is not suitable for batch application, and the zero-sequence voltage acquired and synthesized by an electric field induction mode is easily influenced by the environment and has larger error, the accuracy is difficult to ensure, and the like.
In order to solve the technical problem, the invention provides a power distribution network fault protection method based on a self-adaptive differential grounding algorithm, which is characterized by comprising the following steps of:
installing an edge calculating device at each monitoring point of each feeder line of the medium-voltage distribution line, taking any one power distribution room as a central monitoring point, and installing a central edge calculating device;
the edge computing device collects three-phase transient current signals on a line, processes the signals, judges whether a ground fault occurs by adopting a self-adaptive differential grounding algorithm, and uploads the result to the central edge computing device;
the central edge computing device carries out the positioning of the earth fault section according to the earth fault judgment result uploaded by each edge computing device;
after the central edge computing device completes the positioning of the ground fault section, a tripping command is issued to the relevant breaker of the feeder line with the ground fault, the isolation of the fault line is completed, a closing command is issued to the contact switch, and the recovery of power supply in the non-fault area is realized.
In the above steps, the step of judging whether the ground fault occurs to the adaptive differential grounding algorithm is as follows:
discrete sampling is carried out on the three-phase current;
calculating the phase summation sum sigma I of each phase current sampling valueAn|、∑|IBn|、∑|ICnAnd the sum of the absolute values of the differences between the sampled values of the current between each two phases |, IABn|、∑|IACn|、∑|IBCn|；
Comparing the difference accumulated sum with all the phase accumulated sums respectively: if the difference accumulated sum is larger than all the phase accumulated sums at the same time, assigning 1 to the difference accumulated sum; if the difference accumulated sum is smaller than the accumulated sum of all phases at the same time, assigning 0 to the difference accumulated sum;
if the accumulated sum of the difference values has two 1, one is 0, the boundary fault is judged, namely, a ground fault signal flows through the edge computing device;
if the sum of the differences has two or three 0, it is determined that an out-of-range fault occurs, i.e., a ground fault signal does not flow through the edge calculation apparatus.
In the above step, the step of the center edge computing device positioning the ground fault section according to the ground fault determination result uploaded by each edge computing device is as follows:
and if the edge computing device at the power supply side has the ground fault signal and the edge computing device at the load side has no ground fault signal, the ground fault is judged to be positioned between the two edge computing devices.
In the above steps, the step of issuing a trip instruction to the relevant breaker of the feeder line with the ground fault to complete the fault line isolation and issuing a closing instruction to the contact switch to realize the power restoration in the non-fault area is as follows:
the central edge computing device sends a switching-off instruction to two adjacent edge computing devices with ground faults, controls a circuit breaker in the edge computing devices to switch off, and isolates the faults;
the central edge computing device sends a closing instruction to other edge computing devices on the feeder line, and a power supply is supplied to a non-fault area;
and the central edge computing device uploads the fault positioning, fault isolation and fault recovery results to the main station and informs operation and maintenance personnel to check the processing results.
In the above step, the edge computing device collects the three-phase transient current signal on the line by one of the following two ways:
the first method is as follows: the three-phase current transformer synchronously samples through an ADC chip to obtain a three-phase transient current signal;
the second method comprises the following steps: the current transformer is arranged on an overhead line, the sampling and wireless communication functions are integrated in the transformer, sampling data are transmitted to the collecting unit through wireless signals, and the collecting unit synthesizes three-phase transient current signals.
In the above step, the sampling frequency of discrete sampling of the three-phase current is 256 points per cycle, and the sampling length is 10 milliseconds, which is a half cycle.
In the above step, the processing of the three-phase transient current signal on the acquisition line by the edge computing device includes performing hardware filtering on the three-phase transient current signal, and filtering the power frequency signal and the interference signal by a hardware filtering circuit.
In the above step, the hardware filter circuit is composed of a first-stage anti-interference filter circuit and a second-stage band-pass filter circuit.
In the above step, the primary anti-interference filter circuit filters common mode surge through a circuit composed of two TVS tubes Z1 and Z3, filters differential mode surge through a circuit composed of one TVS tube Z2, filters common mode interference signals through a circuit composed of resistors R2 and R6, capacitors C1 and C4, and performs wave filtering on differential mode interference signals through a circuit composed of resistors R2 and R6, and capacitors C2; the second-stage band-pass filter circuit consists of a low-pass filter and an active high-pass filter.
In the above steps, the frequency selection range of the secondary band-pass filter is 200Hz to 2000 Hz.
The invention has the beneficial effects that: the method comprises the steps that edge computing devices are installed on a line, whether a ground fault occurs or not is computed in the edge computing devices through a self-adaptive differential grounding algorithm, the result of a ground fault signal is uploaded to a center edge computing device, the center edge computing device rapidly judges a grounding position according to the grounding signal of each edge computing device, a tripping instruction is sent to a fault position breaker, ground fault isolation is completed, a closing instruction is further sent to a connecting switch, and power supply recovery of a non-fault area is completed. The self-adaptive difference value grounding algorithm is only calculated according to phase current, wave recording files of all monitoring terminals are not needed, implementation is easy, zero sequence voltage is not needed to participate in calculation in all edge calculation devices, a zero sequence voltage transformer is not needed to be installed, cost is low, field implementation is simple and convenient, the self-adaptive difference value grounding algorithm is suitable for batch application, zero sequence voltage is not needed to be synthesized in an electric field induction mode, and errors of the synthesized zero sequence voltage are avoided. The self-adaptive difference grounding algorithm adopts a difference accumulation sum method, does not need to set parameters, and is convenient to operate and manage on site. The earth fault location and fault isolation do not depend on the analysis of the remote main station, and the analysis and processing are carried out by the central edge computing device, so that the communication and processing requirements on the remote main station are reduced, the responsibility boundary between the remote main station and an equipment manufacturer is clear, the system operation and maintenance management efficiency is improved, and the operation reliability is improved.
Drawings
Fig. 1 is a flow chart of power distribution network line ground fault location, ground fault isolation and protection according to an embodiment of the present invention;
FIG. 2 is a flow chart of the edge computing device in FIG. 1 for acquiring three-phase transient current signals on a line, processing the signals, and determining whether a ground fault occurs by using an adaptive differential grounding algorithm;
FIG. 3 is a schematic diagram of the deployment of edge computing devices and the operation of a fault location and protection system on a power distribution network in accordance with one embodiment of the present invention;
fig. 4 schematically provides a schematic diagram of a filter circuit for filtering phase currents in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Fig. 1 is a flow chart of positioning, isolating and protecting a ground fault of a power distribution network line according to an embodiment of the present invention.
In step S101, an edge calculating device is installed at each monitoring point of each feeder line of the medium-voltage distribution line, and a central edge calculating device is installed by taking any one of the distribution rooms as a central monitoring point. For example, in the schematic diagram of the distribution network layout edge computing device and the fault location and protection system shown in fig. 3, a dual-power 10kV distribution network is composed of a power supply 1 and a power supply 2, and the distribution network has three feeders, namely a feeder 1, a feeder 2 and a feeder 3. An edge computing device (edge device for short) is installed on each feeder line, F11, F12, F13 and F14 edge devices are installed on the feeder line 1, F21, F22, F23 and F24 edge devices are installed on the feeder line 2, F31, F32 and F33 edge devices are installed on the feeder line 3, a center edge computing device F34 (center device for short) is installed, and each edge computing device is matched with a breaker and can switch short circuit and ground faults.
In step S102, the edge computing device collects three-phase transient current signals on the line, processes the signals, determines whether a ground fault occurs by using an adaptive differential grounding algorithm, and uploads the result to the center edge computing device.
Specific steps involved in implementing the above steps are illustrated in fig. 2, and include steps S201 to S206: in step S201, the edge computing device collects three-phase transient current signals on the line by one of the following two ways: (mode one) the three-phase current transformer acquires a three-phase transient current signal through synchronous sampling of an ADC chip; and (mode II) the current transformer is arranged on an overhead line, the sampling and wireless communication functions are integrated in the transformer, the sampling data are transmitted to the collecting unit through wireless signals, and the collecting unit synthesizes three-phase transient current signals.
In step S202, the edge computing device filters the acquired three-phase transient current signal on the line, including hardware filtering the three-phase transient current signal, and filters its power frequency signal and interference signal through a hardware filter circuit. As shown in fig. 4, the hardware filter circuit is composed of two stages of filter circuits, i.e., a first stage anti-interference filter circuit and a second stage band-pass filter circuit. The primary anti-interference filter circuit filters common-mode surge shock through a circuit composed of two TVS tubes Z1 and Z3, filters differential-mode surge shock through a circuit composed of one TVS tube Z2, filters common-mode interference signals through a circuit composed of resistors R2 and R6, capacitors C1 and C4, and performs wave filtering on the differential-mode interference signals through a circuit composed of resistors R2 and R6 and capacitors C2; the second-stage band-pass filter circuit consists of a low-pass filter and an active high-pass filter, and the frequency selection range of the second-stage band-pass filter circuit is 200Hz to 2000 Hz. After the filter circuit is adopted to filter three-phase transient current signals on a line, power frequency and noise interference can be well eliminated.
In step S203, discrete sampling is performed on the filtered three-phase current, with a sampling frequency of 256 points per cycle and a sampling length of 10 milliseconds, which is a half cycle. The sampling frequency and the sampling length can ensure that three-phase current data obtained after discrete sampling is not distorted, and the data processing amount is minimum.
In step S204, the phase-accumulated sum Σ | I of the sampled values of each phase current is calculatedAn|、∑|IBn|、∑|ICnAnd the sum of the absolute values of the differences between the sampled values of the current between each two phases |, IABn|、∑|IACn|、∑|IBCn|。
Wherein the content of the first and second substances,
IAnis a discrete value of a certain sampling point after the A phase current is filtered, IBnFiltering for B-phase currentDiscrete value of last sampling point, ICnIs a discrete value, | I, of a certain sampling point after C-phase current filteringABnI is the absolute value of the A phase sampling point value minus the B phase sampling point valueACnI is the absolute value of the A phase sampling point value minus the C phase sampling point valueBCnAnd | is the absolute value of the B-phase sampling point value minus the C-phase sampling point.
In step S205, the difference accumulated sum is compared with all the phase accumulated sums, respectively: if the difference accumulated sum is larger than all the phase accumulated sums at the same time, assigning 1 to the difference accumulated sum; if the sum of difference values is simultaneously less than the sum of all the phases, the sum of difference values is assigned 0. I.e., if Σ IABn|>∑|IAn|、∑|IBn|、∑|ICnI, assigning a value of 1; if Σ | IACn|>∑|IAn|、∑|IBn|、∑|ICnI, assigning a value of 1; if Σ | IBCn|>∑|IAn|、∑|IBn|、∑|ICnI, assigning a value of 1; if Σ | IABn|<∑|IAn|、∑|IBn|、∑|ICnI, assigning a value of 0; if Σ | IACn|<∑|IAn|、∑|IBn|、∑|ICnI, assigning a value of 0; if Σ | IBCn|<∑|IAn|、∑|IBn|、∑|ICnAnd | is assigned a value of 0.
In step S206, if the sum of the differences has two 1, one 0, it is determined as an in-bound fault, i.e. a ground fault signal flows through the edge calculation device; if the sum of the differences has two or three 0, it is determined that an out-of-range fault occurs, i.e., a ground fault signal does not flow through the edge calculation apparatus. For example, if the device F21 in fig. 3 calculates the AB and AC sum of difference values to be 1 and the BC sum of difference values to be 0 according to the above method, it is determined that the device a in F21 has a ground fault, and it is determined that the feeder 2 in which the F21 is located has a ground fault.
In fig. 1, in step S103, the center edge computing device performs the ground fault section location according to the ground fault determination result uploaded by each edge computing device. The method comprises the following specific steps: and if the edge computing device at the power supply side has the ground fault signal and the edge computing device at the load side has no ground fault signal, the central edge computing device judges that the ground fault is positioned between the two edge computing devices. For example, in fig. 3, if the device F21 calculates the AB and AC difference sum to be 1 and the BC difference sum to be 0, it is determined that the device a of F21 has a ground fault, and it is determined that the feeder 2 where F21 is located has a ground fault; the sum of the difference values of AB, AC and BC of the devices F22, F23 and F24 on the feeder line 2 is 0, so that no ground fault is generated; the sum of difference values of AB, AC and BC of devices F11, F12, F13, F14, F31, F32, F33 and F34 on the feeder line 1 and the feeder line 3 is 0, and no ground fault is generated; the center device F34 locates that the ground fault is located between F21 and F22 according to the above result.
In step S104, after completing the positioning of the ground fault section, the central edge computing device issues a trip instruction to the relevant breaker of the feeder line with the ground fault, completes the fault line isolation, and issues a switch-on instruction to the contact switch, thereby realizing the recovery of power supply in the non-fault area. The method comprises the following specific steps: the central edge computing device sends a switching-off instruction to two adjacent edge computing devices with ground faults, controls a circuit breaker in the edge computing devices to switch off, and isolates the faults; the central edge computing device sends a closing instruction to other edge computing devices on the feeder line, and a power supply is supplied to a non-fault area; and the central edge computing device uploads the fault positioning, fault isolation and fault recovery results to the main station and informs operation and maintenance personnel to check the processing results. In the embodiment of fig. 3, after the central device completes the fault line selection and location, the switches before and after the fault point are controlled to be switched off, i.e. the switches F21 and F22 are switched off, the fault is isolated, the interconnection switch F24 is controlled to be switched on, and the power supply 2 is supplied to the non-fault area. And the central device uploads the fault positioning, fault isolation and fault recovery results to the main station and informs operation and maintenance personnel to check the processing results.
The embodiment of the invention can carry out sequence adjustment, combination and deletion according to actual needs.
The embodiments describe the present invention in detail, and the specific embodiments are applied to illustrate the principle and the implementation of the present invention, and the above embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A power distribution network fault protection method based on a self-adaptive differential grounding algorithm is characterized by comprising the following steps:
installing an edge calculating device at each monitoring point of each feeder line of the medium-voltage distribution line with the non-effectively grounded neutral point, taking any one power distribution room as a central monitoring point, and installing a central edge calculating device;
the edge computing device collects three-phase transient current signals on a line, processes the signals, judges whether a ground fault occurs by adopting a self-adaptive differential grounding algorithm, and uploads the result to the central edge computing device;
the central edge computing device carries out the positioning of the earth fault section according to the earth fault judgment result uploaded by each edge computing device;
after the central edge computing device finishes the positioning of the ground fault section, a tripping command is issued to a related breaker of a feeder line with the ground fault, the isolation of a fault line is finished, a closing command is issued to a contact switch, and the recovery of power supply in a non-fault area is realized;
the ground fault refers to a single-phase ground fault;
the self-adaptive differential grounding algorithm judges whether a grounding fault occurs or not according to the following steps:
discrete sampling is carried out on the three-phase transient current signal, and the sampling length is half cycle, namely 10 milliseconds;
calculating the phase summation sum sigma I of each phase transient current signal sampling valueAn|、∑|IBn|、∑|ICnAnd the sum of the absolute difference of the sampled values of the transient current signal between each two phasesABn|、∑|IACn|、∑|IBCn|；
Comparing the difference accumulated sum with all the phase accumulated sums respectively: if the difference accumulated sum is larger than all the phase accumulated sums at the same time, assigning 1 to the difference accumulated sum; if the difference accumulated sum is smaller than the accumulated sum of all phases at the same time, assigning 0 to the difference accumulated sum;
if the accumulated sum of the difference values has two 1, one is 0, the boundary fault is judged, namely, a ground fault signal flows through the edge computing device; if the sum of the differences has two or three 0, it is determined that an out-of-range fault occurs, i.e., a ground fault signal does not flow through the edge calculation apparatus.
2. The power distribution network fault protection method based on the adaptive difference grounding algorithm according to claim 1, wherein the step of the central edge computing device positioning the ground fault section according to the ground fault determination result uploaded by each edge computing device is as follows:
and if the edge computing device at the power supply side has the ground fault signal and the edge computing device at the load side has no ground fault signal, the ground fault is judged to be positioned between the two edge computing devices.
3. The power distribution network fault protection method based on the adaptive difference grounding algorithm according to claim 1, wherein the steps of issuing a trip instruction to the relevant breaker of the feeder line with the ground fault, completing the isolation of the fault line, and issuing a closing instruction to the contact switch to realize the recovery of power supply in the non-fault area are as follows:
the central edge computing device sends a switching-off instruction to two adjacent edge computing devices with ground faults, controls a circuit breaker in the edge computing devices to switch off, and isolates the faults;
the central edge computing device sends a closing instruction to other edge computing devices on the feeder line, and a power supply is supplied to a non-fault area;
and the central edge computing device uploads the fault positioning, fault isolation and fault recovery results to the main station and informs operation and maintenance personnel to check the processing results.
4. The method for fault protection of the power distribution network based on the adaptive difference grounding algorithm according to claim 1, wherein the edge computing device collects three-phase transient current signals on the line by one of the following two methods:
the first method is as follows: the three-phase current transformer synchronously samples through an ADC chip to obtain a three-phase transient current signal;
the second method comprises the following steps: the current transformer is arranged on an overhead line, the sampling and wireless communication functions are integrated in the transformer, sampling data are transmitted to the collecting unit through wireless signals, and the collecting unit synthesizes three-phase transient current signals.
5. The method for power distribution network fault protection based on the adaptive difference grounding algorithm according to claim 1, wherein the sampling frequency for discrete sampling of the three-phase transient current signal is 256 points per cycle.
6. The power distribution network fault protection method based on the adaptive difference grounding algorithm according to claim 1, wherein the processing of the three-phase transient current signals on the collected lines by the edge computing device comprises hardware filtering of the three-phase transient current signals, and filtering of power frequency signals and interference signals of the three-phase transient current signals by a hardware filtering circuit.
7. The method for fault protection of a power distribution network based on an adaptive differential grounding algorithm according to claim 6,
the hardware filter circuit consists of a first-stage anti-interference filter circuit and a second-stage band-pass filter circuit.
8. The method for fault protection of a power distribution network based on an adaptive differential grounding algorithm according to claim 7,
the primary anti-interference filter circuit filters common-mode surge shock through a circuit composed of two TVS tubes (Z1 and Z3), filters differential-mode surge shock through a circuit composed of one TVS tube (Z2), filters common-mode interference signals through a circuit composed of resistors (R2 and R6) and capacitors (C1 and C4), and performs wave filtering on differential-mode interference signals through a circuit composed of resistors (R2 and R6) and capacitors (C2); the second-stage band-pass filter circuit consists of a low-pass filter and an active high-pass filter.
9. The method according to claim 8, wherein the frequency selection range of the secondary band-pass filter is between 200Hz and 2000 Hz.
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