CN102280866A - Traveling wave data acquisition and processing device - Google Patents
Traveling wave data acquisition and processing device Download PDFInfo
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Abstract
The invention provides a traveling wave data acquisition and processing device which comprises a traveling wave data acquisition module and a traveling wave data processing module, wherein the traveling wave data acquisition module can comprise a core control module, a second order active low-pass filtering module, a second order passive band-pass filtering module, a protecting hardware starting module, a multi-circuit switch module, an A/D (Analog-to-digital) conversion module and a dual-port RAM (Random Access Memory) module. According to the technical scheme of the invention, the synchronous and high-speed data acquisition can be carried out on current traveling wave and voltage traveling wave, real-time and high-speed digital signal processing can be carried out on a large amount of traveling wave data at the same time, the characteristics of traveling wave data are extracted, a wavelet transform algorithm is realized, and a hardware platform and a software platform are provided for the realization of a traveling wave protection technique.
Description
Technical field
The present invention relates to field of power, more specifically, relate to the capable wave datum collection and the processing unit in a kind of relaying protection field.
Background technology
Comprise abundant fault message in current traveling wave after the ultra-high-tension power transmission line fault and the voltage traveling wave, can be used as the foundation of fault detect.Traveling-wave protection is not subjected to that current transformer is saturated to be influenced; be not subjected to the influence of power system oscillation, be not subjected to the influence of transmission line charging capacitor electric current, be not subjected to the influence of transmission line series capacitor and shunt reactor; not being subjected to the influence of transition resistance, is one of important directions of Protection Technology development.The realization of traveling-wave protection be unable to do without travelling wave signal and obtains and the travelling wave signal treatment technology.Voltage traveling wave after the fault and current traveling wave signal are signals that spectral range is very wide, and for voltage traveling wave and current traveling wave are gathered accurately, protective device must have sufficiently high data sampling rate.Traveling-wave protection simultaneously needs to handle in real time the row wave datum, and the speed that corresponding traveling-wave protection is handled data has higher requirement again.Travelling wave signal is different from traditional based on power frequency electric parameters signal, is a kind of non-stationary variable signal, can not adopt traditional signal processing technology.
Therefore, for realizing the traveling-wave protection technology, existing data acquisition and data processing technique can not directly be applied mechanically, and need a kind of capable wave datum collection and row wave datum treatment technology.
Summary of the invention
In view of this; technical problem to be solved by this invention is, a kind of capable wave datum collection and processing unit are provided, and realizes the collection of row wave datum; for fault detect and relaying protection based on the row ripple provide data, for the traveling-wave protection system provides accurately, reliable failure diagnosis foundation.
Therefore, the invention provides a kind of capable wave datum collection and processing unit, comprising: row wave datum acquisition module and row wave datum processing module.
Wherein, described capable wave datum acquisition module can comprise: kernel control module, second order active low-pass filter module, the passive bandpass filtering modules block of second order, protect hardware-initiated module, multicircuit switch module, A/D modular converter and dual port RAM module.
Described second order active low-pass filter module receives the capable mode analog signal from circuit, and described capable mode analog signal is carried out filtering, and described capable mode analog signal comprises voltage traveling wave analog signal and current traveling wave analog signal.
The passive bandpass filtering modules block of described second order is connected to described second order active low-pass filter module, is used for extracting high-frequency signal the row ripple from the signal of the output of described second order active low-pass filter module.
The hardware-initiated module of described protection; reception is from the described high-frequency signal of the passive bandpass filtering modules block of described second order; and determine whether described high-frequency signal satisfies predetermined condition, after described high-frequency signal satisfies described predetermined condition, send enabling signal to described kernel control module.
Described multicircuit switch module is connected to described second order active low-pass filter module, is used for exporting described capable mode analog signal to the A/D modular converter successively after receiving from the control signal of described kernel control module.
Described A/D modular converter is connected to described multicircuit switch module, according to the control signal from described kernel control module, described capable mode analog signal is carried out the A/D conversion, and exports transformation result to the dual port RAM module.
Described dual port RAM module, have two groups of data/address buss and two group address buses, be used under the control of described kernel control module, storing described transformation result, and under the control of described capable wave datum processing module, send described transformation result to described capable wave datum processing module from described A/D modular converter.
Described kernel control module; reception is from the described enabling signal of the hardware-initiated module of described protection; control described multicircuit switch, described A/D converter and described dual port RAM; and realize decoding, and send interrupt signal to described capable wave datum processing module to address bus and data/address bus.
Described capable wave datum processing module receives the interrupt signal from described kernel control module, reads described transformation result from described dual port RAM, according to pre-defined algorithm described transformation result is handled to determine the row wave characteristic.
In technique scheme, preferably, described capable wave datum processing module also comprises:
The SDRAM memory is used to store described data processing module and handles required data;
The FLASH memory is used to store the algorithm routine that described data processing module adopts.
Preferably, described kernel control module is made of CPLD.
Preferably; the hardware-initiated module of described protection comprises: level comparison circuit; described high-frequency signal is converted to level signal; then described level signal and default triggering level signal are compared; when described level signal is higher than described predetermined triggering level signal, send enabling signal to described kernel control module.
Preferably, the cut-off frequency of described second order active low-pass filter module is 250kHz.
Preferably, the logical frequency configuration of the band of the passive bandpass filtering modules block of described second order is 3kHz～30kHz.
Preferably, described A/D modular converter is two or more.
Preferably, described dual port RAM module is two, is used for storing respectively the current sampling signal and the voltage sampling signal of circuit.
Preferably, described processing module is carried out triumphant human relations Bel conversion to described transformation result and is obtained modulus row wave datum, then described modulus row wave datum is carried out wavelet transformation, and determines the row wave characteristic according to the result of wavelet transformation.
By capable wave datum collection provided by the invention and processing unit, collection and processing have been realized, for relaying protection system provides accurately, reliable failure diagnosis foundation to the row wave datum.
Description of drawings
Fig. 1 shows the schematic block diagram of capable wave datum collection according to an embodiment of the invention and processing unit;
The hardware that Fig. 2 shows capable wave datum collection according to an embodiment of the invention and row wave datum processing unit constitutes schematic diagram;
Fig. 3 shows the microprocessor program schematic flow sheet of device shown in Figure 2;
Fig. 4 shows dyadic wavelet transform multiresolution decomposing schematic representation in the device shown in Figure 2.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with the drawings and specific embodiments.
Set forth a lot of details in the following description so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 1 shows the schematic block diagram of capable wave datum collection according to an embodiment of the invention and processing unit.
As shown in Figure 1, a kind of capable wave datum collection and processing unit 100 comprise: row wave datum acquisition module 102 and row wave datum processing module 104.
Described capable wave datum acquisition module 102 comprises: kernel control module 1022, second order active low-pass filter module 1024, the passive bandpass filtering modules block 1026 of second order, the hardware-initiated module 1028 of protection, multicircuit switch module 10210, A/D modular converter 10212, dual port RAM module 10214.
Second order active low-pass filter module 1024 receives the capable mode analog signal from circuit, and described capable mode analog signal is carried out filtering, and row mode analog signal comprises voltage traveling wave analog signal and current traveling wave analog signal.
The passive bandpass filtering modules block 1026 of second order is connected to second order active low-pass filter module 1024, is used for extracting high-frequency signal the row ripple from the signal of the output of second order active low-pass filter module 1024.
Protect hardware-initiated module 1028, receive high-frequency signal, and whether definite high-frequency signal satisfy predetermined condition, after high-frequency signal satisfies predetermined condition, send enabling signal to kernel control module 1022 from the passive bandpass filtering modules block 1026 of second order.
Multicircuit switch module 10210 is connected to second order active low-pass filter module 1024, is used for will going the mode analog signal and exports A/D modular converter 10212 successively to after receiving from the control signal of kernel control module 1022.
A/D modular converter 10212 is connected to multicircuit switch module 10210, according to the control signal from kernel control module 1022, row mode analog signal is carried out the A/D conversion, and export transformation result to dual port RAM module 10214.
Dual port RAM module 10214 has two groups of data/address buss and address bus, is used for storing under the control of kernel control module 1022 transformation result from A/D modular converter 10212, and is read transformation result by row wave datum processing module 104.
Kernel control module 1022; receive the enabling signal of the hardware-initiated module 1028 of self-shield; control multicircuit switch 10210, A/D converter 10212 and dual port RAM module 10214; and realize decoding, and send interrupt signal to row wave datum processing module to address bus and data/address bus.
Row wave datum processing module 104 receives the interrupt signal from kernel control module 1022, reads transformation result from dual port RAM module 10214, according to pre-defined algorithm transformation result is handled to determine the row wave characteristic.
Kernel control module 1022 can be made of CPLD (CPLD).
Protect hardware-initiated module 1028 to comprise: level comparison circuit; high-frequency signal is converted to level signal; then level signal and default triggering level signal are compared, when level signal is higher than predetermined triggering level signal, send enabling signal to kernel control module.
The cut-off frequency of second order active low-pass filter module 1024 is 250kHz.
The logical frequency configuration of the band of the passive bandpass filtering modules block 1026 of second order is 3kHz～30kHz.
A/D modular converter 10212 is two or more.
Dual port RAM module 10214 is two, is used for storing respectively the current sampling signal and the voltage sampling signal of circuit.
104 pairs of transformation results of processing module are carried out triumphant human relations Bel conversion and are obtained modulus row wave datum, then modulus row wave datum are carried out wavelet transformation, and determine the row wave characteristic according to the result of wavelet transformation.
The hardware that Fig. 2 shows capable wave datum collection according to an embodiment of the invention and row wave datum processing unit constitutes schematic diagram.
As shown in Figure 2, form by High Speed Data Acquisition Circuit I and high-speed digital signal treatment circuit II two parts according to capable wave datum collection and the row wave datum processing unit 200 of this embodiment.The composition and the function declaration of each module are as follows:
High Speed Data Acquisition Circuit I: comprise second order active low-pass filter module 202; The passive bandpass filtering modules block 204 of second order; The protected data processing hardware starts module 206; Multicircuit switch module 208; A/D modular converter 210; Dual port RAM module 212; CPLD (CPLD) control and decoding module 214.Wherein:
1) second order active low-pass filter module 202:
After 8 tunnel analog signals input to this device, enter second order active low-pass filter 202, the cut-off frequency of this filter can be set to 250kHz, satisfies Shannon's sampling theorem and filtering High-frequency Interference.
2) the passive bandpass filtering modules block 204 of second order:
The logical frequency of the band of the passive bandpass filtering modules block 204 of second order is 3kHz～30kHz, extracts the high-frequency signal in the capable ripple of current failure, as row wave datum processing hardware enabling signal.
3) going the wave datum processing hardware starts module 206:
This module can realize by the level comparison loop that operational amplifier constitutes, HFS in the capable ripple of current failure after passing through the passive bandpass filtering modules block 204 of second order is (after 3kHz～30kHz) pairing level surpasses default hardware-initiated level, enabling signal is sent to CPLD control and decoding module 214 in hardware-initiated loop, CPLD triggers high speed digital signal processor 216 and interrupts, and enters capable wave datum handling procedure.
4) the multicircuit switch module 208:
Multicircuit switch 208 can be four to select one high speed diverter switch, exports four tunnel analog signals to the A/D module successively.By being used in combination of multicircuit switch module and A/D module, can improve the frequency of sampling greatly, can improve data processing speed simultaneously.
5) A/D module:
Adopt 2 high speed A module 210A and 210B in the A/D module, realize high speed A, the data sampling rate of each road analog signal is reached 1MHz analog signal.
6) dual port RAM module:
2 dual port RAM 212A and 212B are used to store 8 way word signals after the A/D conversion, and memory space is 128Kbyte.A dual port RAM is deposited 4 road current acquisition signals, and another piece dual port RAM is deposited 4 road voltage acquisition signals, and dual port RAM adopts the circulation location mode.Dual port RAM has two group address buses and two groups of data/address buss, be responsible for the data after mould/number conversion are write dual port RAM by CPLD control and decoding module 214, and be responsible for reading fault data in the dual port RAM by high speed digital signal processor 216, and go wave datum in real time and handle, therefore can realize the high speed acquisition of fault data and the synchronous execution that high-speed data is handled, greatly improve the real time data processing ability of capable wave datum collection and processing unit.
7) CPLD control and decoding module 214:
CPLD control and decoding module 214 are core control sections of high-speed data acquisition, it is realized the coordination control of multicircuit switch, A/D and dual port RAM and the decoding of address/data bus signal, realize that 8 tunnel analog signal conversion become digital signal and are stored in the dual port RAM, CPLD control simultaneously and the decoding module 214 wave datum processing hardware of being expert at starts module 206 and starts the back and trigger high-speed digital signal treatment circuit II and enter capable wave datum handling procedure.
(2) high-speed digital signal treatment circuit II
High-speed digital signal treatment circuit II is a core with high speed digital signal processor (DSP) 216, comprising: high speed digital signal processor 216, SDRAM memory 218 and FLASH memory 220.The each several part function is as follows:
1) high speed digital signal processor 216:
This can be a high-speed digital signal process chip, and 32 of data/address buss can carry out floating-point operation, the precision height.Chip internal has 8 arithmetic elements, and per second can be carried out 1,600,000,000 instructions, can satisfy the requirement of ultrahigh speed traveling-wave protection to data processing speed and precision simultaneously.
2) the SDRAM memory 218:
Adopt 2 SDRAM memories, constitute the random access memory of 32 2Mbyte bytes, be used to deposit algorithm desired data and fault recorder data.
3) the FLASH memory 220:
Be used to deposit the program of algorithm.High speed digital signal processor 216 back that powers on is automatically read in the program in the FLASH memory 220 among the RAM of high speed digital signal processor 216 inside and is moved.
Fig. 3 shows the microprocessor program schematic flow sheet of device shown in Figure 2.
As shown in Figure 3, after high speed digital signal processor 216 starts row wave datum handling procedure, high speed digital signal processor 216 at first reads the capable wave datum (302) in the dual port RAM, then popular ripple of three-phase electricity and voltage traveling wave data are carried out triumphant human relations Bel conversion (304), be transformed into three line mold components and one zero mold component, shown in (1) and formula (2).Then modulus row wave datum is carried out wavelet transformation (306), wavelet transformation is concrete as Fig. 4, obtains the capable wave datum feature based on wavelet transformation at last, for the traveling-wave protection criterion provides characteristic (308).
Fig. 4 shows dyadic wavelet transform multiresolution decomposing schematic representation in the device shown in Figure 2.Two decomposition formulas that advance wavelet transform are as the formula (3):
F in the following formula (n) is the discrete sampling value point of current traveling wave or voltage traveling wave, h
kAnd g
kBe two to advance the bank of filters coefficient in the wavelet transform decomposition algorithm,
The current traveling wave signal is carried out the decomposition of wavelet transformation multiresolution ask for sub-frequency space W2{62.5,125kHz}, W3{31.25,62.5kHz}, W4{15.625, the modulus maximum among the 31.25kHz} and the polarity of modulus maximum, thus obtain the wave head polarity S I of current failure initial row ripple
α, SI
β, SI
γVoltage traveling wave is carried out the wave head polarity S U that same algorithm process obtains voltage failure initial row ripple
α, SU
β, SU
γ
By on regard to the description of embodiments of the invention; be appreciated that; according to technical scheme of the present invention can carry out synchronously current traveling wave and voltage traveling wave, at a high speed data acquisition; simultaneously to a large amount of capable wave datum carry out in real time, high-speed digital signal handles; extract row wave datum feature and realize Wavelet Transformation Algorithm, for the realization of traveling-wave protection technology provides hardware platform and software platform.
Can reach following performance index according to technical scheme of the present invention:
1, sample frequency 0～1MHz is optional.
2, synchronous data collection way: 8 tunnel (4 road electric currents and 4 road voltages).
3, A/D conversion accuracy: 14.
But 4 store data length 128Kbyte.
5, the Key Performance Indicator of core processor: 32 floating-point operations, per second can be carried out 1,600,000,000 instructions.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. capable wave datum collection and processing unit is characterized in that, comprising: row wave datum acquisition module and row wave datum processing module, wherein,
Described capable wave datum acquisition module comprises: kernel control module, second order active low-pass filter module, the passive bandpass filtering modules block of second order, protect hardware-initiated module, multicircuit switch module, A/D modular converter, dual port RAM module, wherein
Described second order active low-pass filter module receives the capable mode analog signal from circuit, and described capable mode analog signal is carried out filtering, and described capable mode analog signal comprises voltage traveling wave analog signal and current traveling wave analog signal;
The passive bandpass filtering modules block of described second order is connected to described second order active low-pass filter module, is used for extracting high-frequency signal the row ripple from the signal of the output of described second order active low-pass filter module;
The hardware-initiated module of described protection, reception is from the described high-frequency signal of the passive bandpass filtering modules block of described second order, and determine whether described high-frequency signal satisfies predetermined condition, after described high-frequency signal satisfies described predetermined condition, send enabling signal to described kernel control module;
Described multicircuit switch module is connected to described second order active low-pass filter module, is used for exporting described capable mode analog signal to the A/D modular converter successively after receiving from the control signal of described kernel control module;
Described A/D modular converter is connected to described multicircuit switch module, according to the control signal from described kernel control module, described capable mode analog signal is carried out the A/D conversion, and exports transformation result to the dual port RAM module;
Described dual port RAM module has two groups of data/address buss and two group address buses, is used for storing under the control of described kernel control module the described transformation result from described A/D modular converter, and is read described transformation result by described capable wave datum processing module; And
Described kernel control module, reception is from the described enabling signal of the hardware-initiated module of described protection, control described multicircuit switch, described A/D converter and described dual port RAM, and realize decoding, and send interrupt signal to described capable wave datum processing module to described address bus and described data/address bus; And
Described capable wave datum processing module receives the interrupt signal from described kernel control module, reads described transformation result from described dual port RAM, according to pre-defined algorithm described transformation result is handled to determine the row wave characteristic.
2. capable wave datum collection according to claim 1 and processing unit is characterized in that, described capable wave datum processing module also comprises:
The SDRAM memory is used to store described data processing module and handles required data; And
The FLASH memory is used to store the algorithm routine that described data processing module adopts.
3. capable wave datum collection according to claim 1 and 2 and processing unit is characterized in that described kernel control module is made of CPLD.
4. capable wave datum collection according to claim 1 and 2 and processing unit; it is characterized in that; the hardware-initiated module of described protection comprises: level comparison circuit; described high-frequency signal is converted to level signal; then described level signal and default triggering level signal are compared; when described level signal is higher than described predetermined triggering level signal, send enabling signal to described kernel control module.
5. capable wave datum collection according to claim 1 and 2 and processing unit is characterized in that the cut-off frequency of described second order active low-pass filter module is 250kHz.
6. capable wave datum collection according to claim 1 and 2 and processing unit is characterized in that, the logical frequency configuration of the band of the passive bandpass filtering modules block of described second order is 3kHz～30kHz.
7. capable wave datum collection according to claim 1 and 2 and processing unit is characterized in that described A/D modular converter is two or more.
8. capable wave datum collection according to claim 1 and 2 and processing unit is characterized in that described dual port RAM module is two, are used for storing respectively the current sampling signal and the voltage sampling signal of circuit.
9. capable wave datum collection according to claim 1 and 2 and processing unit, it is characterized in that, described processing module is carried out triumphant human relations Bel conversion to described transformation result and is obtained modulus row wave datum, then described modulus row wave datum is carried out wavelet transformation, and determine the row wave characteristic according to the result of wavelet transformation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472361A (en) * | 2013-09-18 | 2013-12-25 | 上海申贝科技发展有限公司 | Power transmission line fault positioning system based on space signal detection and high-precision time service |
| CN105319479A (en) * | 2014-05-29 | 2016-02-10 | 国网山西省电力公司电力科学研究院 | Transmission line double-terminal fault ranging system |
| CN113193542A (en) * | 2021-04-29 | 2021-07-30 | 西南交通大学 | Method for setting traveling wave protection fixed value of high-voltage direct current line |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270316A (en) * | 2000-06-09 | 2000-10-18 | 清华大学 | High-speed synchronous data acquiring and digital signal processing board |
| CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
| CN1508554A (en) * | 2001-06-01 | 2004-06-30 | 清华大学 | Single-phase earthing failure line-selecting method for small-current earthing system |
| CN101719662A (en) * | 2009-11-06 | 2010-06-02 | 北京衡天北斗科技有限公司 | Fault line selection device for distribution line of small-current grounding system |
| CN201532430U (en) * | 2009-10-30 | 2010-07-21 | 甘肃省电力公司兰州供电公司 | Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points |
| CN101799512A (en) * | 2009-12-31 | 2010-08-11 | 清华大学 | Single-terminal failure wave-recording and distance-measuring device facing single space in transformer substation |
-
2011
- 2011-04-28 CN CN201110108106XA patent/CN102280866A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270316A (en) * | 2000-06-09 | 2000-10-18 | 清华大学 | High-speed synchronous data acquiring and digital signal processing board |
| CN1508554A (en) * | 2001-06-01 | 2004-06-30 | 清华大学 | Single-phase earthing failure line-selecting method for small-current earthing system |
| CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
| CN201532430U (en) * | 2009-10-30 | 2010-07-21 | 甘肃省电力公司兰州供电公司 | Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points |
| CN101719662A (en) * | 2009-11-06 | 2010-06-02 | 北京衡天北斗科技有限公司 | Fault line selection device for distribution line of small-current grounding system |
| CN101799512A (en) * | 2009-12-31 | 2010-08-11 | 清华大学 | Single-terminal failure wave-recording and distance-measuring device facing single space in transformer substation |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472361A (en) * | 2013-09-18 | 2013-12-25 | 上海申贝科技发展有限公司 | Power transmission line fault positioning system based on space signal detection and high-precision time service |
| CN103472361B (en) * | 2013-09-18 | 2016-08-17 | 上海申贝科技发展有限公司 | Based on Spatial Signal Detection and the transmission open acess system of high accuracy time service |
| CN105319479A (en) * | 2014-05-29 | 2016-02-10 | 国网山西省电力公司电力科学研究院 | Transmission line double-terminal fault ranging system |
| CN105319479B (en) * | 2014-05-29 | 2018-08-10 | 国网山西省电力公司电力科学研究院 | Two ends of electric transmission line fault localization system |
| CN113193542A (en) * | 2021-04-29 | 2021-07-30 | 西南交通大学 | Method for setting traveling wave protection fixed value of high-voltage direct current line |
| CN113193542B (en) * | 2021-04-29 | 2022-03-01 | 西南交通大学 | Method for setting traveling wave protection fixed value of high-voltage direct current line |
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