CN203241491U - Light synchronization phasor measurement all-in-one machine (PMU light) based on embedded operation system - Google Patents

Abstract

The utility model discloses a light synchronization phasor measurement all-in-one machine (PMU light) based on an embedded operation system; the PMU Light comprises a double-microprocessor unit and an industrial control mainboard unit; one microprocessor collects phasor signals from an AC power grid through a signal conditioning analog-digital converting unit, and is connected with the other microprocessor through a buffer unit; simultaneously the double-microprocessor unit is connected with the AC power grid through a power unit; the double-microprocessor unit is respectively connected with an input control unit and a dual-mode time service /positioning unit; the industrial control mainboard unit is respectively connected with the double-microprocessor unit, a mouse keyboard unit, a display unit and an alarm unit, and is for sending out calculation results through a triple-mode emission unit; the PMU Light is high in synchronization measuring precision, good in instantaneity, and wide in measuring frequency scope; dual-mode time service positioning is realized; multi-mode signal transmission is realized; networking mode is flexible; simultaneously on line analysis, real time curve display and on line identification early warning are carried out on a device measuring terminal; and the PMU Light can be seamlessly integrated with desktop application programs.

Description

Light-duty synchronous phasor measurement all-in-one based on embedded OS

Technical field

The utility model relates to a kind of light-duty synchronous phasor measurement all-in-one (PMU Light) of being combined with embedded OS, and is seamless integrated with multipad.

Background technology

National energy security is being born and optimizing allocation of resources, ensured to electrical network, promoting the task of socio-economic development that Chinese energy is serious uneven with the load distribution, is determining that large Power System Interconnection is the only way which must be passed of China Power Grids development.Building up of extra-high voltage grid will make each large regional power grid contact tightr, and measurement is had higher requirement to electrical power system wide-area.Electrical network is carried out wide area measurement, and Real-Time Monitoring electrical network phasor multidate information is the necessary means that ensures large power grid operation.

The major equipment of synchronous phasor measurement is the PMU(synchronous phasor measurement unit in the electrical network at present), it is based on GPS (Global Positioning System, GPS) the high-precise synchronization clock that provides, realized the strange land synchronized phasor measurement technology, PMU record line voltage electric current phasor, extract these phasor information, namely can determine the duty of system, play an important role in Power System Analysis and control numerous areas.

But along with the arrival in intelligent grid epoch, the application of PMU has shown its limitation.

1, conventional PMU cost involves great expense, and need to be installed in the important node such as main generating plant, transformer station, installs complicated;

2, conventional PMU time service, positioning unit are the GPS(GPS), belong to resource and the technology of U.S. control, exist the U.S. to close down the risk that system behind the GPS can't time service;

3, conventional PMU need establish the special line communication transmission channel, and the laying-out cost is higher, and has limited device and install and measure the place;

4, conventional PMU does not incorporate present advanced person's 3G(third generation wireless communication technology) wireless communication technology;

5, the synchronized measurement system of conventional PMU composition, server is analyzed, calculates, is shown in the main website of system, does not carry out intuitive analysis, curve demonstration, on-line identification fault and warning etc. at measuring junction.

Part defective in view of conventional PMU, 220v user's side electrical network phasor measurement and dispensing device (patent No.: 201120251335.2, publication number CN202159086U) tentatively solve PMU cost height, installed complicated, the defectives such as the time service location is subjected to the foreign resources restriction, the complexity of communicating by letter.Being actually used in this utility model of middle discovery also comes with some shortcomings:

1, measurement device precision aspect departs from reference frequency when larger in signal frequency, and precision is influenced, and measurement range is limited;

2, each phasor result of measurement device is aspect computational analysis, and real-time has much room for improvement; The hardware configuration of device needs to improve;

3, side signal transmission face, because device is installed in 220V user's side, wired internet transmission is subject to the restriction of network access in some areas;

4, there are a common defects in device and PMU, the synchro measure data transmission can be carried out on-line analysis calculating, early warning etc. to the main website server, do not carry out on-line analysis, real-time curve demonstration, on-line identification, early warning etc. in the measuring junction user-side device.

The utility model content

The purpose of this utility model is exactly in order to address the above problem, and a kind of light-duty synchronous phasor measurement all-in-one based on embedded OS is provided, and it has, and the synchro measure precision is high, good, the survey frequency wide ranges of real-time; Double mode time service location; The multi-mode signal transmission, networking mode is flexible; Show at the on-line analysis of measurement device end, real-time curve simultaneously, the on-line identification early warning, with the seamless advantage such as integrated of multipad.

To achieve these goals, the utility model adopts following technical scheme.

A kind of light-duty synchronous phasor measurement all-in-one (PMU Light) based on embedded OS, comprise the dual micro processor unit, the industrial control mainboard unit, buffer memory unit, power supply unit, the signal condition AD conversion unit, double mode time service/positioning unit, described dual micro processor unit comprises first microprocessor and the second microprocessor, first microprocessor gathers the phasor signal by the signal condition AD conversion unit from AC network, and then pass through buffer memory unit, be connected with the second microprocessor, the dual micro processor unit is connected with AC network by power supply unit simultaneously; The dual micro processor unit also is connected with Input Control Element, double mode time service/positioning unit respectively; The industrial control mainboard unit is connected with dual micro processor unit, mouse-keyboard unit, display unit, alarm unit respectively, and by the three-mode transmitting element result of calculation is spread out of.

Described first microprocessor is nursed one's health AD conversion unit by control signal, and line voltage after transformation, filtering, AD conversion, is obtained the instantaneous voltage data; Through buffer memory unit, received by the second microprocessor, calculate the phasors such as phase angle, amplitude, frequency of grid side voltage; Integrate with the information such as Perfect Time of double mode time service/positioning unit (GPS or triones navigation system) simultaneously, obtain real-time phasor information; The electrical network phasor that will have a time tag by the second microprocessor afterwards adopts double mode send mode to be sent to the industrial control mainboard unit, the real-time receive data in industrial control mainboard unit and online drafting, the real-time phase discharge curve of analysis, direct-on-line is reported to the police when abnormal conditions occurring, meanwhile the industrial control mainboard unit sends to data the main website server in real time by the three-mode send mode, is convenient to analysis and Control under the whole system networking state.

Described dual micro processor unit comprises first microprocessor and the second microprocessor, first microprocessor is connected with AC network by the signal condition AD conversion unit, first microprocessor is connected with the second microprocessor by buffer memory unit, the dual micro processor unit is connected with AC network by power supply unit simultaneously, the dual micro processor unit also is connected with double mode time service/positioning unit, and the industrial control mainboard unit is connected with dual micro processor unit, power supply unit, three-mode transmitting element respectively.

Described dual micro processor unit be two based on the central computing module of ARM.At present in the selection of processor, instruction and the performance of 16 single-chip microcomputers are limited on the one hand, and the cost of 32 bit processors and power consumption are high on the other hand, so, can address this problem based on the STM32 series processors of ARMCortex-M3 kernel.

STM32 series is based on aiming at the custom-designed ARMCortex-M3 kernel of the Embedded Application that requires high-performance, low cost, low-power consumption.Be divided into two different series: STM32F103 " enhancement mode " series and STM32F101 " basic model " series by performance.Enhancement mode series clock frequency reaches 72MHz, is the highest product of like product performance; During clock frequency 72MHz, from the flash memory run time version, STM32 power consumption 36mA is product least in power-consuming on 32 markets, is equivalent to 0.5mA/MHz.Here we select STM32F103 " enhancement mode " series.

Described buffer memory unit is cache module dual port RAM 7005.

Described industrial control mainboard unit is selected and is ground Chinese workers' industry ATX mainboard AIMB-252, and processing speed is fast, and rich interface is low in energy consumption.

Described signal condition AD conversion unit comprises transformer module, RC signal filtering module, the analog-to-digital conversion module that connects successively.

Described control module is button.

Described display unit is the Industry Control display of 7 cun 1024*600 resolution.

Described double mode time service/positioning unit is the double mode time service module of gps system module and triones navigation system.

Described three-mode data transmission unit is wireless communication module, serial communication module and internet wire communication module.

The described phasors such as phase angle that the Adaptive Second assessment algorithm calculates grid side voltage, amplitude, frequency of utilizing.

Described Adaptive Second algorithm for estimating, the discrete fourier transform algorithm that the electrical network phasor measuring set that ratio is conventional and " Dual mode 220 v user side power grid phasor measuring and dispensing device " adopt is compared, in measuring-signal frequency departure reference frequency ± 5Hz situation, measuring accuracy is higher, and survey frequency is wider.

Described Adaptive Second algorithm for estimating comprises sampling algorithm and double sampling frequency algorithm;

A described sampling algorithm is the fast Fourier algorithm based on the discrete fourier algorithm, after obtaining a frequency, carries out the sampling second time and calculating, obtains final frequency, and in conjunction with the advantage of hardware configuration of the present utility model, computing velocity is fast, and precision is high.

The double sampling frequency algorithm is as follows:

If mains voltage signal as shown in the formula

$X\left(t\right)=\sqrt{2}X\sin (\mathrm{\ωt}+\mathrm{\φ})---\left(3\right)$

X (t): the continued time domain signal of voltage; X: voltage effective value; ω: angular velocity; T: time; φ: phase angle.

${\stackrel{\&OverBar;}{X}}_1=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{X}_k{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N}}$

$=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\cos \frac{2\mathrm{\&pi;}}{N}k-j\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{X}_k\sin \frac{2\mathrm{\&pi;}}{N}k---\left(4\right)$

$\&equiv;X_c-{\mathrm{jX}}_s$

$\stackrel{\&OverBar;}{X}=\frac{1}{\sqrt{2}}j{\stackrel{\&OverBar;}{X}}_1=\frac{1}{\sqrt{2}}(X_s+{\mathrm{jX}}_c)---\left(5\right)$

Current voltage phasor form; By FFT calculate to fundamental phasors; X _cX _s: the real part imaginary part of definition; J: imaginary unit; N: the sampling number of each window; K: coefficient 1,2,3 ... N; X _k: sampling point value.

To the N in the above-mentioned calculation window point, remove the 1st, in the end increase by 1, obtain next data window data sequence, obtain current phasor by formula (6), (7) recurrence, obtain amplitude, the phase angle of current phasor by formula (5), obtain second phasor value.The like, calculate the data point of several windows, obtain corresponding voltage phasor value.

${X_c}^{\left(\mathrm{new}\right)}=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\cos \frac{2\mathrm{\&pi;}}{N}\left(k\right)+\frac{2}{\mathrm{<figure-callout\; id="2"\; label="N\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">N</figure-callout>}}\cos 2\mathrm{\&pi;}(X_N-X_0)---\left(6\right)$

${X_s}^{\left(\mathrm{new}\right)}=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{X}_k\sin \frac{2\mathrm{\&pi;}}{N}\left(k\right)+\frac{2}{N}\sin 2(X_N-X_0)---\left(7\right)$

X _N: the point that increases newly; X ₀: the point of abandoning; X _s ^(new)X _c ^(new): the newly-increased phasor real part imaginary part of adding some points and obtaining.

According to the voltage phasor value that obtains, according to formula (8) calculation deviation frequency, the amplitude of last phasor, phase angle are the amplitude phase angle of current electrical network by the rate of change of phase angle.

$\mathrm{\&Delta;f}=\frac{1}{2\mathrm{\&pi;}}\frac{\mathrm{d\&psi;}}{\mathrm{dt}}---\left(8\right)$

ψ: the phase angle of phasor; Δ f a: sampling frequency deviation.

Can obtain thus sample frequency one time:

${\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA00003077495700021.png"\; state="\{\{state\}\}">f</figure-callout>}}_1=f_0+\frac{1}{2\mathrm{\&pi;}}\frac{\mathrm{d\&psi;}}{\mathrm{dt}}---\left(9\right)$

f ₁: a sample frequency; f ₀: electrical network benchmark rated frequency.

Frequency deviation f once, sampling rate adjusting carries out double sampling again, and then obtains the phase angle ψ ' of the phasor in the double sampling situation, recycling formula (8) try to achieve the double sampling frequency departure as shown in the formula:

${\mathrm{\&Delta;f}}^{\&prime;}=\frac{1}{2\mathrm{\&pi;}}\frac{{\mathrm{d\&psi;}}^{\&prime;}}{\mathrm{dt}}---\left(10\right)$

Finally try to achieve the double sampling frequency as shown in the formula:

f _fine＝f ₀+Δf+Δf' （11）

f _FineBe final double sampling frequency, Δ f' is the double sampling frequency departure.

The beneficial effects of the utility model:

The real-time low-pressure side electrical network of 1 high precision collecting phasor information adopts two-step self-adaptive estimation correction algorithm so that voltage magnitude, phase angle, frequency etc. the phase accuracy of measurement is high in real time, and do not departed from reference value and affected, measurement range is wide.The sample frequency of 2000Hz and the transmission frequency of 20Hz are so that device can provide measured data for analysis of transient process again for steady-state process.

2 at measurement device end integration industrial control mainboard unit and embedded OS, seamless integrated with multipad, has realized that the measuring junction on-line analysis is calculated, the real-time phase discharge curve of drafting also shows the function that this earth fault of on-line identification is also reported to the police.

3 three-mode data transmission unit are connected with main website of system server, can be according to Internet resources flexible choice internet wire communication on the spot, GPRS radio communication and serial communication mode.

4 double mode time service/positioning units are so that the enhancing of device synchronous safety.Preferential GPS time service, location, the degree of accuracy height selected, when the GPS misalignment, automatically switch to triones navigation system, time, geographic location signal reliability height are realized the time synchronized between the different device, be convenient to server the phasor of electric system different location is analyzed.

5 devices adopt the dual micro processor unit structure, have guaranteed sampling and speed and the coordination of calculating, and the peripheral circuit that enriches simultaneously is that the Function Extension of device leaves enough spaces.The analog-to-digital conversion process unit adopts the design of CS5460A to use, and has also greatly alleviated the burden of microprocessor, and the in addition use of detection of power loss, nonvolatile memory strengthens the overall performance of device and reliability.

Description of drawings

Fig. 1 is the entire system structural drawing;

Fig. 2 is signal condition AD conversion unit structural drawing;

Fig. 3 is transformation filtration module wiring diagram;

Fig. 4 is analog-to-digital conversion module CS5460A wiring diagram;

Fig. 5 is location time service unit connection diagram;

Fig. 6 is three-mode data transmission unit wiring diagram;

Fig. 7 is display unit;

Fig. 8 is microprocessor 1 program execution flow figure;

Fig. 9 is microprocessor 2 program execution flow figure;

Figure 10 is algorithm flow chart;

Figure 11 device software framework map;

Wherein, 1, first microprocessor; 2, the second microprocessor; 3, industrial control mainboard; 4, buffer; 5,220v AC power; 6, signal condition AD conversion unit; 7, control module; 8, double mode time service/positioning unit; 9, doubleway output industrial power; 10, mouse-keyboard unit; 11, display unit; 12, three-mode data transmission unit; 13, alarm unit; 14, transformer module; 15, RC filter unit; 16, analog-to-digital conversion module; 17, wireless communication module; 18, serial communication module; 19, internet wire communication module.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.

Be a kind of light-duty synchronous phasor measurement all-in-one machine structure figure based on embedded OS such as Fig. 1, it comprises first microprocessor 1, the second microprocessor 2 and industrial control mainboard 3, first microprocessor 1 gathers the phasor signal by signal condition AD conversion unit 6 from 220v AC power 5, and then by buffer 4, be connected with the second microprocessor 2, first microprocessor 1 is connected with 220v AC power 5 by doubleway output industrial power 9 simultaneously; First microprocessor 1 is connected with control module 7, and the second microprocessor 1 also is connected with control module 17, double mode time service/positioning unit 8 respectively; Industrial control mainboard 3 is connected with first microprocessor 1, the second microprocessor 2, mouse-keyboard unit 10, display unit 11, alarm unit 13 respectively, and by three-mode data transmission unit 12 result of calculation is spread out of.The model of buffer 4 is ID7005.

220v low-pressure side power network signal is through signal condition AD conversion unit 6, through transformation, filtering obtains simulating weak electric signal, first microprocessor 1 control analog-to-digital conversion module 16 is with 2000hz frequency collection digital signal, and pass to buffer 4, the second microprocessor 2 analyzes the amplitude of electrical network, frequency, phase place, the signal that gathers double mode time service/positioning unit 8 obtains the time, geography information, integrate with the phasor that calculates, obtain the electrical network phasor of sequential, and the control data send to industrial control mainboard 3, industrial control mainboard 3 receiving and analyzing data also show each quantity of information and real-time curves at display unit 11, by three-mode data transmission unit 12 data are sent to the terminal server analysis simultaneously, when measurement data reached alert status, industrial control mainboard 3 can be reported to the police in 13 signallings of control alarm unit.

Shown in the signal condition AD conversion unit 6 of Fig. 2, wherein, signal conditioning circuit comprises transformer module 14, and it becomes the 150mV weak electric signal with 220V forceful electric power signal transition, and RC filter unit 15 stays fundamental signal with the harmonic wave elimination of electrical network simultaneously.Signal conditioning circuit schematic diagram such as Fig. 2, shown in Figure 3: utilize voltage transformer (VT) (TV1013-1), actual electric network voltage is become weak electric signal, by the medium and small distortion of RC filter unit 15 elimination power network signals, convert the signal that to sample to.The specified input and output electric current of TV1013-1 2mA allows the highest demarcation of voltage to 450V in electrical network, and it is that the maximum input voltage of AD conversion chip (CS5460A) is 150mV that conditioning obtains analog-to-digital conversion module 16.Analog-to-digital conversion module 16 as shown in Figure 4, its core component is chip CS5460A.

AD chip CS5460A, driving voltage 5V, sample frequency is made as 2K HZ, and namely every 0.5ms once samples to simulating signal, carries out an AD conversion.The digital signal output form is 24 two's complement, sends interrupt request to first microprocessor 1 when converting, and first microprocessor 1 response interrupts reading the voltage transient Value Data of AD conversion.

Employing standard SPI communication mode communicates, and communication takies four order wires, has saved chip pin, simultaneously for having saved the space on the layout of PCB.

The wiring diagram of the double mode location of Fig. 5/time service unit 8, double mode time service/positioning unit 8 have two cover positioning system, gps system and triones navigation systems.GPS positioning system time service precision selects gps system that transposition is carried out time service, location greater than triones navigation system under the normal state at present.Automatically detect the gps signal quality, when its signal is unavailable, automatically switch to triones navigation system.

Double mode time service/positioning unit 8 external antennas receive satellite information, signal is processed, obtain the real-time time, (approximately want 5 minutes positioning time to geography information, just can obtain accurate information after namely starting 5 minutes), by serial ports to the second microprocessor 2 transmission informations, be RXD3, TXD3(is shown in Figure 5).

Among Fig. 6, three-mode data transmission unit 12 realizes the unit of data communication for this device terminal server connects, and it is comprised of three parts: wireless communication module 17, serial communication module 18, internet wire communication module 19.Before device brings into operation, can arrange communication mode, select that GPRS is wireless, serial or wire communication mode.

Wireless communication module 17 is GPRS, 3G or CDMA, be equipped with and open related service SIM Mobile phone card, it is a small-sized mobile base station, can be by USB interface and microprocessor communication, receive instruction, after system initialization 3G module etc. arranges, connect with server by 3G module etc., communicate with server.

Internet wire communication module 18 is embedded ethernet serial data modular converter, 10/100M self-adaptation Ethernet interface, 32 ARM9 microprocessors carry out Data Format Transform, realize the conversion of serial data and Ethernet data, connect the internet network, carry out data transmission.

GPRS communication, serial communication and internet wire communication respectively have superiority, and favourable communication mode can be selected according to situation on the spot in the measurement device place, select communication mode, which bar passage of microprocessor choice for use when the device initialization.

The display unit 11 of Fig. 7, adopt ripe LCD MODULE, the 12v power initiation, be connected with industrial control mainboard by the VGA interface, show that in real time each phasor of electrical network and time, locating information and data send state, and each variable forms real-time curve and intuitively shows, also can show fault alarm information.

Control module 7 is button, is used for startups, the first microprocessor 1 that resets, the second microprocessor 2, and keyboard and mouse unit 10 is the peripherals of industrial control mainboard 3, is used for the man-machine interaction of implement device and the seamless link of desktop to operate.

Fig. 8 is the program execution flow figure of first microprocessor 1, and first microprocessor 1 initialization comprises first microprocessor 1 functional configuration initialization; The initialization of analog-to-digital conversion module 16 sends order to it, prepares conversion.

Fig. 9 is the program execution flow figure of the second microprocessor 2, and initialization comprises: the second microprocessor 2 chip functions configuration initialization, serial communication modular 18 initialization.

Among Figure 10, electric voltage frequency, amplitude, phase angle arithmetic that the utility model adopts are the Adaptive Second algorithm for estimating, the discrete fourier transform algorithm that the electrical network phasor measuring set that ratio is conventional and " Dual mode 220 v user side power grid phasor measuring and dispensing device " adopt is compared, in measuring-signal frequency departure reference frequency ± 5Hz situation, measuring accuracy is higher, and survey frequency is wider.

A sampling algorithm in the algorithm flow chart is the fast Fourier algorithm based on the discrete fourier algorithm, after obtaining a frequency, carries out the sampling second time and calculating, obtain final frequency, in conjunction with the advantage of hardware configuration of the present utility model, computing velocity is fast, and precision is high.

Briefly introducing of double sampling frequency algorithm is as follows:

If mains voltage signal as shown in the formula

$X\left(t\right)=\sqrt{2}X\sin (\mathrm{\&omega;t}+\mathrm{\&phi;})---\left(3\right)$

X (t): the continued time domain signal of voltage; X: voltage effective value; ω: angular velocity; T: time; φ: phase angle.

${\stackrel{\&OverBar;}{X}}_1=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{X}_k{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N}}$

$=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\cos \frac{2\mathrm{\&pi;}}{N}k-j\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; sin"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\sin \frac{2\mathrm{\&pi;}}{N}k---\left(4\right)$

$\&equiv;X_c-{\mathrm{jX}}_s$

$\stackrel{\&OverBar;}{X}=\frac{1}{\sqrt{2}}j{\stackrel{\&OverBar;}{X}}_1=\frac{1}{\sqrt{2}}(X_s+{\mathrm{jX}}_c)---\left(5\right)$

Current voltage phasor form; By FFT calculate to fundamental phasors; X _cX _s: the real part imaginary part of definition; J: imaginary unit; N: the sampling number of each window, this utility model is got N=40; K: coefficient 1,2,3 ... N; X _k: sampling point value.

To the N in the above-mentioned calculation window point, remove the 1st, in the end increase by 1, obtain next data window data sequence, obtain current phasor by formula (6), (7) recurrence, obtain amplitude, the phase angle of current phasor by formula (5), obtain second phasor value.The like, calculating 5 windows is 5N=200 data point, obtains altogether 161 phasor value.

${X_c}^{\left(\mathrm{new}\right)}=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\cos \frac{2\mathrm{\&pi;}}{N}\left(k\right)+\frac{2}{\mathrm{<figure-callout\; id="2"\; label="N\; cos"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">N</figure-callout>}}\cos 2\mathrm{\&pi;}(X_N-X_0)---\left(6\right)$

${X_s}^{\left(\mathrm{new}\right)}=\frac{2}{N}\underset{k=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="X\; k\; sin"\; filenames="HDA00003077495700011.png,HDA00003077495700021.png"\; state="\{\{state\}\}">X</figure-callout>}}_k\sin \frac{2\mathrm{\&pi;}}{N}\left(k\right)+\frac{2}{N}\sin 2(X_N-X_0)---\left(7\right)$

X _N: the point that increases newly; X ₀: the point of abandoning; X _s ^(new)X _c ^(new): the newly-increased phasor real part imaginary part of adding some points and obtaining.

According to 81 voltage phasors that obtain, according to formula (8) calculation deviation frequency, the amplitude of last phasor, phase angle are the amplitude phase angle of current electrical network by the rate of change of phase angle.

$\mathrm{\&Delta;f}=\frac{1}{2\mathrm{\&pi;}}\frac{\mathrm{d\&psi;}}{\mathrm{dt}}---\left(8\right)$

ψ: the phase angle of phasor; Δ f a: sampling frequency deviation.

Can obtain thus sample frequency one time:

${\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA00003077495700021.png"\; state="\{\{state\}\}">f</figure-callout>}}_1=f_0+\frac{1}{2\mathrm{\&pi;}}\frac{\mathrm{d\&psi;}}{\mathrm{dt}}---\left(9\right)$

f ₁: a sample frequency; f ₀: electrical network benchmark rated frequency, the utility model is got 50Hz.

Frequency deviation f once, sampling rate adjusting carries out double sampling again, and then obtains the phase angle ψ ' of the phasor in the double sampling situation, recycling formula (8) try to achieve the double sampling frequency departure as shown in the formula:

${\mathrm{\&Delta;f}}^{\&prime;}=\frac{1}{2\mathrm{\&pi;}}\frac{{\mathrm{d\&psi;}}^{\&prime;}}{\mathrm{dt}}---\left(10\right)$

Finally try to achieve the double sampling frequency as shown in the formula:

f _fine＝f ₀+Δf+Δf' （11）

f _FineBe final double sampling frequency, Δ f' is the double sampling frequency departure.

Figure 11 device software framework map, each module initialization after device powers on, industrial control mainboard 3 starts, in double mode time service/positioning unit 8 effective situations, first microprocessor 1 control corresponding module Information Monitoring, data enter the second microprocessor 2 and carry out analytical calculation afterwards, the result delivers to industrial control mainboard 3, industrial control mainboard 3 is compiled in real time, and all information show each phasor and corresponding real-time curve in real time at display unit 11, by three-mode sending module 12 information is sent to main website server, Analysis of Networking simultaneously.When double mode time service/positioning unit 8 receive datas are invalid, install automatic redirect from major clock, run well.

Although above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims (8)

1. light-duty synchronous phasor measurement all-in-one based on embedded OS, it is characterized in that, comprise the dual micro processor unit, the industrial control mainboard unit, buffer memory unit, power supply unit, the signal condition AD conversion unit, double mode time service/positioning unit, described dual micro processor unit comprises first microprocessor and the second microprocessor, first microprocessor is connected with AC network by the signal condition AD conversion unit, first microprocessor is connected with the second microprocessor by buffer memory unit, the dual micro processor unit is connected with AC network by power supply unit simultaneously, the dual micro processor unit also is connected with double mode time service/positioning unit, the industrial control mainboard unit respectively with the dual micro processor unit, power supply unit, the three-mode transmitting element connects.

2. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that also comprise Input Control Element, the dual micro processor unit also is connected with Input Control Element.

3. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that also comprise the mouse-keyboard unit, the mouse-keyboard unit is connected with industrial control mainboard.

4. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that also comprise display unit, display unit is connected with industrial control mainboard.

5. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that also comprise alarm unit, alarm unit is connected with industrial control mainboard.

6. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that, described signal condition AD conversion unit comprises transformer module, RC signal filtering module, the analog-to-digital conversion module that connects successively.

7. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that, described double mode time service/positioning unit is the double mode time service module of gps system module and triones navigation system.

8. the light-duty synchronous phasor measurement all-in-one based on embedded OS as claimed in claim 1 is characterized in that, described three-mode data transmission unit is wireless communication module, serial communication module and internet wire communication module.

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