CN102680824A - Electric energy quality detecting and analyzing system for pantograph-catenary current collection based on DSP (Digital Signal Processor) - Google Patents
Electric energy quality detecting and analyzing system for pantograph-catenary current collection based on DSP (Digital Signal Processor) Download PDFInfo
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Abstract
The invention discloses an electric energy quality detecting and analyzing system for pantograph-catenary current collection based on a DSP (Digital Signal Processor). A pantograph-catenary heavy-voltage heavy-current signal is acquired by output ends of a voltage transformer and a current transformer; the output end of the voltage transformer is connected with the input end of a voltage transducer and is also connected with the input end of a three-phase current transducer; the output ends of the voltage transducer and the three-phase current transducer are respectively connected with two input ends of an A/D (Analog/Digital) chip acquisition circuit in a data analyzing and processing system; the output end of the A/D chip acquisition circuit is connected with the input end of an embedded system based on the DSP; and any serial port in the embedded system based on the DSP is connected with a display interface of an upper computer through a serial port connecting wire. According to the electric energy quality detecting and analyzing system disclosed by the invention, a modern signal processing technology is applied to detection of electrical parameters of pantograph-catenary current collection for the first time and the analytical processing capacity of wavelet transformation and Fourier transformation for time domain and frequency domain is fully utilized.
Description
Technical field
The present invention relates to a kind of bow net Data Detection analytic system, relate in particular to a kind of pantograph-catenary current collection Power Quality Detection analytic system based on DSP.
Background technology
Contact net is the energy source of bullet train operation.The fluidity that receives of pantograph contact net can directly influence the security of operation stability of train; Wherein to have constituted the coupled relation of bullet train system dynamics jointly be the important factor in order that influences the pantograph-catenary current collection quality for pantograph contact net relation and wheel rail relation, the solid relation of stream; Therefore the pantograph-catenary current collection relation is for bullet train, for guaranteeing that the pantograph-catenary current collection quality has crucial meaning.
The detection of existing pantograph contact line relation is divided into contact and detects and non-contact detection.What mainly detect is stagger, lead height, span, contact pressure, hard spot, speed, anchor point, temperature etc.For realizing comprehensive comprehensive detection of bow net parameter; The important component part that the bow net electrical parameters detection detects as bow net; Through to the bow net electrical parameters detection, can realize the pantograph-catenary current collection performance is carried out auxiliary evaluation, have important scientific meaning and engineering practical value.
Also do not come out to pantograph-catenary current collection Power Quality Detection device specially both at home and abroad at present, present stage mainly is to detect bow net electric current and voltage effective value, and as tiny ingredient in the middle of the detection train.Only detect the detection method of effective value, can not specifically know the moment location that electric signal undergos mutation and the amplitude frequency plot of the each harmonic in the electric signal, have certain limitation.
Summary of the invention
The technical matters that the present invention will solve provides a kind of pantograph-catenary current collection Power Quality Detection analytic system based on DSP, has made things convenient for the electric monitoring to the bow net state.
For solving the problems of the technologies described above, the present invention realizes through following technical scheme:
Comprise voltage transformer (VT), current transformer, voltage transmitter, three-phase current transmitter and the data analysis disposal system of forming by A/D chip Acquisition Circuit, based on embedded system and the host computer display interface of DSP; The output terminal of described voltage transformer (VT) summation current transformer is gathered bow net high-voltage great-current signal; The output terminal of voltage transformer (VT) links to each other with the input end of voltage transmitter; The output terminal of current transformer is connected with the input end of three-phase current transmitter; The output terminal of voltage transmitter and three-phase current transmitter all with the data analysis disposal system in the input end of A/D chip Acquisition Circuit be connected; The output terminal of A/D chip Acquisition Circuit is connected with input end based on the embedded system of DSP, is connected with the host computer display interface through serial port connecting wire based on any serial line interface in the embedded system of DSP; Described voltage transformer (VT) summation current transformer is installed in outside the train roof, and voltage transmitter, three-phase current transmitter and data analysis disposal system are installed in the train.
The effective value of the output voltage of described voltage transformer (VT) and the input voltage of voltage transmitter is 0 ~ 100V; The effective value of the input current of the output current of current transformer and three-phase current transmitter is 0 ~ 1A, and the output voltage of voltage transmitter and three-phase current transmitter is 0 ~ 10V.
Described A/D chip Acquisition Circuit employing is closed the crowd and is reached the circuit structure that comprises the ADS8381IPFBT chip among the EMIF in the SEED-DPS2812 of company, and described embedded system employing based on DSP is closed the crowd and reached the circuit diagram that comprises the TMS320F2812PGFA chip among the EMIF in the SEED-DPS2812 of company.
Sixteen bit digital signal input bus D0～15 corresponding in sixteen bit digital signal output bus D0～15 in the described A/D chip Acquisition Circuit and the embedded system based on DSP link to each other respectively.
ADCIN port in the A/D chip Acquisition Circuit in the output terminal of described voltage transmitter and three-phase current transmitter and the data analysis disposal system is connected.
Compared with prior art, the invention has the beneficial effects as follows:
The modern signal processing technology is applied on the electrical parameters detection of pantograph-catenary current collection, has made full use of the time-domain and frequency-domain analyzing and processing ability of wavelet transformation and Fourier pair signal.Through in the bow net operational process; High frequency collection to bow net electric current and voltage data; Through wavelet transformation data are carried out de-noising and catastrophe point detection then, thereby calculate the catastrophe point moment of bow net data, and calculate the voltage effective value between saltation zone according to respective algorithms; And calculate each harmonic amplitude, frequency, the phase place of data, made things convenient for electric monitoring to the bow net state.
Description of drawings
Fig. 1 is catenation principle figure of the present invention;
Fig. 2 is the connection layout of A/D chip Acquisition Circuit;
Fig. 3 is based on the connection layout of the embedded system of DSP;
Among Fig. 1: 1, voltage transformer (VT), 2, current transformer, 3, the data analysis disposal system, 4, A/D chip Acquisition Circuit, 5, based on the embedded system of DSP, 6, the host computer display interface, 7, voltage transmitter, 8, the three-phase current transmitter.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further explain.
Like Fig. 1, the data analysis disposal system 3 that the present invention includes voltage transformer (VT) 1, current transformer 2, voltage transmitter 7, three-phase current transmitter 8 and form by A/D chip Acquisition Circuit 4, based on embedded system 5 and the host computer display interface 6 of DSP; The output terminal of described voltage transformer (VT) 1 summation current transformer 2 is gathered bow net high-voltage great-current signal; The output terminal of voltage transformer (VT) 1 links to each other with the input end of voltage transmitter 7; The output terminal of current transformer 2 is connected with the input end of three-phase current transmitter 8; The output terminal of voltage transmitter 7 and three-phase current transmitter 8 all with data analysis disposal system 3 in the input end of A/D chip Acquisition Circuit 4 be connected; The output terminal of A/D chip Acquisition Circuit 4 is connected with input end based on the embedded system 5 of DSP, is connected with host computer display interface 6 through serial port connecting wire based on any serial line interface in the embedded system 5 of DSP; Described voltage transformer (VT) 1 summation current transformer 2 is installed in outside the train roof, and voltage transmitter 7, three-phase current transmitter 8 and data analysis disposal system 3 are installed in the train.
The effective value of the input voltage of the output voltage of described voltage transformer (VT) 1 and voltage transmitter 7 is 0 ~ 100V; The effective value of the input current of the output current of current transformer 2 and three-phase current transmitter 8 is 0 ~ 1A, and the output voltage of voltage transmitter 7 and three-phase current transmitter 8 is 0 ~ 10V.
Like Fig. 2, described A/D chip Acquisition Circuit 4 employings are closed the crowd and are reached the circuit structure that comprises the ADS8381IPFBT chip among the EMIF in the SEED-DPS2812 of company; Like Fig. 3, described embedded system 5 employings based on DSP are closed the crowd and are reached the circuit diagram that comprises the TMS320F2812PGFA chip among the EMIF in the SEED-DPS2812 of company.
Sixteen bit digital signal input bus D [0:15] corresponding in sixteen bit digital signal output bus D [0:15] in the described A/D chip Acquisition Circuit 4 and the embedded system 5 based on DSP links to each other respectively.
ADCIN port in the A/D chip Acquisition Circuit 4 in the output terminal of described voltage transmitter 7 and three-phase current transmitter 8 and the data analysis disposal system 3 is connected.
In Fig. 2, the ADCIN port on the right is the input end of A/D chip Acquisition Circuit 4, data bus D0～the 15th on the left side, the output terminal of A/D chip Acquisition Circuit 4.
In Fig. 3, data bus D0～15 on the right are based on the input end of the embedded system 5 of DSP, and signal bus A0～18 on the left side are based on the output terminal of the embedded system 5 of DSP.
Comprise common level shifting circuit in the described A/D chip Acquisition Circuit 4, utilize operational amplifier, 0 ~ 10V voltage transitions of the voltage transmitter 7 and the output of three-phase current transmitter 8 is become A/D chip acceptable 0 ~ 3V voltage.Again this voltage is inserted the A/D chip, realize the A/D conversion of signal.
Described embedded system 5 based on DSP mainly realizes the Power Quality Detection of signal.Mainly adopted quick wavelet algorithm, catastrophe point detection algorithm, harmonic wave detection algorithm.
The introducing of wavelet algorithm is mainly used in the de-noising and the sudden change that detects bow net voltage of bow net signal.Wavelet algorithm comprises wavelet decomposition algorithm and wavelet reconstruction algorithm.The Mallat algorithm is the quick wavelet algorithm that is incorporated in DSP.Common what be used for power quality analysis is Daubechies series wave filter, and selecting filter length for use is 8 the db 4 small echos female small echos as the Mallat algorithm.The signals sampling frequency is 10K, and sampling number is 1024 points, because the main effect of wavelet transformation is to detect sudden change and eliminate high frequency noise.So the decomposition number of plies of small echo is made as 3 layers, obtains 4 frequency separations and is respectively 0 ~ 625Hz, 625 ~ 1250Hz, 1250 ~ 2500Hz, 2500 ~ 5000Hz.The fundamental frequency of signal is 50Hz.For reducing losing of data message, select hard threshold values denoising for use, reached the purpose of eliminating high frequency noise through decomposition and reconstruction to small echo.
Each floor height frequency coefficient analysis through wavelet decomposition is obtained uses the catastrophe point detection algorithm, and can locate and obtain the disturbance operating point, thereby obtain disturbance duration, the disturbance amplitude, and then judge the disturbance type.The disturbance type mainly comprises voltage dip, voltage swells, voltage outage, superpotential, under-voltage etc.
The harmonic wave detection algorithm is all to be to realize through fast Fourier transform (FFT) usually.Directly use fft algorithm, can produce deviation, cause the fence effect and the spectrum leakage of fast Fourier transform (FFT), cause amplitude, frequency, the phase data error of harmonic wave bigger testing result.Especially phase error is very big, can't satisfy harmonic measure requirement accurately.Therefore the harmonic wave detection algorithm mainly is divided into interpolation, fast Fourier transform (FFT), three parts of correction.Select peaceful (Haning) window W (n) of the Chinese=0.5-0.5cos (2 π n/N) in the interpolation algorithm for use.N is that difference is counted, and gets 1024; N is the difference sequence number, gets 1 ~ 1024.
Described host computer display interface 6 uses the labview software development, utilizes serial port connecting wire to communicate by letter with the embedded system 5 based on DSP, realizes the demonstration storage of signal.Use the SCI serial communication function of DSP that packing data is sent.Owing to utilize the SCI bus once can only send 8 data, actual data generally all are that 16 or 32 s' form is kept in the computer.And owing to need to send data of different types information, the data that before each data, add two 8 are formed a Frame with the data of needs transmission more together as the data type signal.At host computer labview end, need the official website of NI company to download a serial port drive program (visa400full).Since data be with Frame be unit transmission, so data can not directly be used, need once could use data frame analyzing.Basic procedure is: the data stream of retrieval sign beginning, find data then, and be reduction of data 16 or 32 subsequent treatment that supply program again.
Embodiment:
Voltage transformer (VT) adopts JDZXW-35 type, current transformer to adopt the LZZB7-35 type, and voltage transmitter adopts the S3-VD-3 type, and the three-phase current transmitter adopts the CAS-3I type.
As shown in Figure 1; A kind of pantograph-catenary current collection Power Quality Detection analytic system based on DSP; Comprise JDZXW-35 type voltage transformer (VT) and LZZB7-35 type current transformer, S3-VD-3 voltage transmitter and CAS-3I three-phase current transmitter, data analysis disposal system; JDZXW-35 type voltage transformer (VT) and LZZB7-35 type current transformer are gathered bow net high-voltage great-current signal; S3-VD-3 voltage transmitter and CAS-3I three-phase current transmitter convert the unification of high-voltage great-current signal to low voltage signal, and the data analysis disposal system is analyzed the stable state transient state electrical quantity of low tension signal, and stable state detects amplitude, frequency, the phase place that is meant the each harmonic in the detection signal.Transient state detects the duration location of the voltage jump be meant in the detection signal, voltage disturbance etc. and continues amplitude.Described JDZXW-35 type voltage transformer (VT) and LZZB7-35 type current transformer can be gathered bow net 25KV, the high-voltage great-current signal of 300A, and this JDZXW-35 type voltage transformer (VT) and LZZB7-35 type current transformer are installed in outside the train roof.Described S3-VD-3 voltage transmitter and CAS-3I three-phase current transmitter can voltage and current signal unify step-down become the data analysis disposal system treatable amplitude be the low voltage signal of positive and negative 10V, this S3-VD-3 voltage transmitter and CAS-3I three-phase current transmitter are installed in the train.Described data analysis disposal system is formed based on embedded system and the host computer display interface of DSP (TMS320F2812PGFA) mainly by the A/D chip Acquisition Circuit based on ADS8381.
The groundwork process of the foregoing description is following:
High-voltage great-current JDZXW-35 type voltage transformer (VT) and LZZB7-35 type current transformer are incorporated into S3-VD-3 voltage transmitter and CAS-3I three-phase current transmitter with the bow net voltage and current signal; Become the low-voltage signal of the positive and negative 10V of amplitude through signal unification behind S3-VD-3 voltage transmitter and the CAS-3I three-phase current transmitter; Be connected on the A/D chip through common level shifting circuit again; Utilize the powerful digital signal processing capability of DSP (TMS320F2812PGFA); Use wavelet algorithm, fourier algorithm, catastrophe point detection algorithm, detect the stable state transient state electrical quantity of electric signal.Stable state detects amplitude, frequency, the phase place that is meant the each harmonic in the detection signal.Transient state detects the duration location of the voltage jump be meant in the detection signal, voltage disturbance etc. and continues amplitude.The input result can reach host computer then, shows, work such as storage and printing reports.
Adopted quick wavelet algorithm (mallat algorithm) in the embedded system based on DSP, selecting filter length for use is 8 the db 4 small echos female small echos as the Mallat algorithm.The signals sampling frequency is 10K, and sampling number is 1024 points, because the main effect of wavelet transformation is to detect sudden change and eliminate high frequency noise.So the decomposition number of plies of small echo is made as 3 layers, obtains 4 frequency separations and is respectively 0 ~ 625Hz, 625 ~ 1250Hz, 1250 ~ 2500Hz, 2500 ~ 5000Hz.The fundamental frequency of signal is 50Hz.
Adopted the harmonic wave detection algorithm in the embedded system based on DSP.Need use interpolation algorithm in the harmonic wave detection algorithm, select peaceful (Haning) window interpolation method of the Chinese for use, W (n)=0.5-0.5cos (2 π n/N), N gets 1024.
The host computer display interface need install serial port drive program (visa400full) additional; In addition also need be to the parameter settings such as baud rate of serial ports; Guarantee at the DSP slave computer consistent with the serial communication parameter at labview host computer two places; Baud rate adopts 19200bit/s, 8 of data bit, 1 of position of rest.
Above-mentioned embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (5)
1. pantograph-catenary current collection Power Quality Detection analytic system based on DSP; It is characterized in that: comprise voltage transformer (VT) (1); Current transformer (2); Voltage transmitter (7), three-phase current transmitter (8) and the data analysis disposal system of forming by A/D chip Acquisition Circuit (4), based on embedded system (5) and the host computer display interface (6) of DSP (3); The output terminal of described voltage transformer (VT) (1) summation current transformer (2) is gathered bow net high-voltage great-current signal; The output terminal of voltage transformer (VT) (1) links to each other with the input end of voltage transmitter (7); The output terminal of current transformer (2) is connected with the input end of three-phase current transmitter (8); The output terminal of voltage transmitter (7) and three-phase current transmitter (8) all with data analysis disposal system (3) in the input end of A/D chip Acquisition Circuit (4) be connected; The output terminal of A/D chip Acquisition Circuit (4) is connected with input end based on the embedded system (5) of DSP, is connected with host computer display interface (6) through serial port connecting wire based on any serial line interface in the embedded system (5) of DSP; Described voltage transformer (VT) (1) summation current transformer (2) is installed in outside the train roof, and voltage transmitter (7), three-phase current transmitter (8) and data analysis disposal system (3) are installed in the train.
2. a kind of pantograph-catenary current collection Power Quality Detection analytic system according to claim 1 based on DSP; It is characterized in that: the effective value of the input voltage of the output voltage of described voltage transformer (VT) (1) and voltage transmitter (7) is 0 ~ 100V; The effective value of the input current of the output current of current transformer (2) and three-phase current transmitter (8) is 0 ~ 1A, and the output voltage of voltage transmitter (7) and three-phase current transmitter (8) is 0 ~ 10V.
3. a kind of pantograph-catenary current collection Power Quality Detection analytic system according to claim 1 based on DSP; It is characterized in that: described A/D chip Acquisition Circuit (4) employing is closed the crowd and is reached the circuit structure that comprises the ADS8381IPFBT chip among the EMIF in the SEED-DPS2812 of company, and described embedded system based on DSP (5) employing is closed the crowd and reached the circuit diagram that comprises the TMS320F2812PGFA chip among the EMIF in the SEED-DPS2812 of company.
4. according to claim 1 or 3 described a kind of pantograph-catenary current collection Power Quality Detection analytic systems based on DSP, it is characterized in that: sixteen bit digital signal output bus D0～15 in the described A/D chip Acquisition Circuit (4) are with continuous respectively based on middle corresponding sixteen bit digital signal input bus D0～15 of the embedded system (5) of DSP.
5. according to claim 1 or 3 described a kind of pantograph-catenary current collection Power Quality Detection analytic systems based on DSP, it is characterized in that: the ADCIN port in the A/D chip Acquisition Circuit (4) in the output terminal of described voltage transmitter (7) and three-phase current transmitter (8) and the data analysis disposal system (3) is connected.
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| CN102866294A (en) * | 2012-09-20 | 2013-01-09 | 南车南京浦镇车辆有限公司 | Signal compatibility testing method based on rail circuit |
| CN103513094A (en) * | 2013-09-29 | 2014-01-15 | 天津理工大学 | Device and method for eliminating power system detection signal noise |
| CN108279357A (en) * | 2017-12-28 | 2018-07-13 | 唐智科技湖南发展有限公司 | A kind of bow net hit detection device |
| CN110031674A (en) * | 2019-04-25 | 2019-07-19 | 宁波中车时代传感技术有限公司 | Motor train unit train energy consumption metering system and method |
| CN112083249A (en) * | 2020-09-17 | 2020-12-15 | 浙江涵普电力科技有限公司 | Intelligent detection device meeting steady-state and transient-state tests and detection method thereof |
| CN112858760A (en) * | 2021-03-24 | 2021-05-28 | 天津益昌电气设备股份有限公司 | Acquisition and analysis device for on-line monitoring of voltage and current of pantograph-catenary |
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| CN112858760A (en) * | 2021-03-24 | 2021-05-28 | 天津益昌电气设备股份有限公司 | Acquisition and analysis device for on-line monitoring of voltage and current of pantograph-catenary |
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Application publication date: 20120919 |