CN103543430B - Standard modulus synchronous signal source - Google Patents
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Abstract
The invention discloses a standard modulus synchronous signal source comprising a digital waveform fitting module, a digital waveform sequence storage module, a digital-to-analog conversion module, a power amplifier module, a protocol conversion module, and a man-machine interface module. The digital waveform fitting module calls waveform fitting data stored in the digital waveform sequence storage module so as to digitally fit analog signals to be output, the digital-to-analog conversion module performs waveform modulation and amplitude modulation on the analog signals, discrete signals are converted into continuous analog signals which are amplified and driven by the power amplifier module, and a voltage current signal is output. The protocol conversion module superposes a discrete sequence value of an analog signal to be output and a discrete sequence value of a preset angular difference and ratio difference signal, converts the post-superposing superposed signal into a digital message, and outputs a digital signal which is synchronous with the standard analog signal. The standard modulus synchronous signal source has the advantages that the analog signal and the digital signal can be output at the same time and electronic transformer calibrators with asynchronous inputs can be calibrated.
Description
Technical field
The present invention relates to a kind of for examining and determine the standard module source of synchronising signal of electronic transducer calibration instrument.
Background technology
In recent years, along with the fast development of intelligent grid technology, the Pilot project construction of digital transformer substation is more and more, digital transformer substation is owing to adopting optical fiber to carry out the transmission of digital quantity, the AD Acquisition Error that does not have secondary voltage drop and simulation electric energy meter, this has greatly reduced the error of conventional metered dose secondary circuit.Therefore, digitizing is the direction of world today's electric power development.
Electronic mutual inductor is the bridge to digital world as simulated world, occupies very important status in digital transformer substation, can think that electronic mutual inductor is the foundation stone of digital transformer substation, and all digital quantities are all to derive from it.Therefore, the precision of electronic mutual inductor and performance are extremely important.China's measurement Law specifies that all measurement instruments all must the amount of obtaining pass, and namely all measurement instruments all must be able to be realized the north source of value.Therefore need in actual applications the electronic mutual inductor amount of carrying out biography, after installing at the scene, also need it to carry out verification, verify its measuring accuracy and stability, and the correctness that IEC61850 agreement is supported.
Electronic transducer calibration instrument possesses the function of electronic mutual inductor being carried out to angular difference, ratio verification, and can carry out full frame analysis to communication message, can also carry out various communication failure tests and precision checking to electronic mutual inductor.
And for electronic transducer calibration instrument, also must have one can carry out the equipment of calibrating comprehensively to its function and performance.But, not yet have the national rule that pair electronic transducer calibration instrument is examined and determine to put into effect at present, external also not relevant equipment and standard.
Summary of the invention
The object of the present invention is to provide a kind of standard module source of synchronising signal that can examine and determine electronic transducer calibration instrument.
Above-mentioned purpose of the present invention realizes by following technical measures: a kind of standard module source of synchronising signal, is characterized in that: it comprises digital waveform fitting module, digital waveform sequence memory module, D/A converter module, power amplifier module, protocol conversion module and human-machine interface module, described digital waveform sequence memory module, human-machine interface module, protocol conversion module is connected with described digital waveform fitting module respectively, described digital waveform fitting module also with D/A converter module, power amplifier module connects successively, described digital waveform fitting module is called the waveform fitting data that are stored in digital waveform sequence memory module and is treated the simulating signal of output and carry out digital matching, by D/A converter module, this simulating signal is carried out to waveform modulated and amplitude modulation(PAM) again, make discrete signal be converted to continuous simulating signal, after power amplifier module amplification and driving, export a road voltage and current signal, be used for inputting the standard channel port of electronic transducer calibration instrument as the simulation signal generator of standard, and the superposed signal after the discrete series value stack of the discrete series value of the simulating signal of exporting and the difference signal of default angular difference and ratio is converted to digital message by described protocol conversion module, export the digital signal of synchronizeing with the simulating signal of standard in a road, be used for inputting the tested access port of electronic transducer calibration instrument as standardized digital signal source, described human-machine interface module is for the parameter of each road output signal is set, to control each road output signal.
The present invention can realize simulating signal and digital signal is exported simultaneously, and because the standard signal of electronic transducer calibration instrument is analog quantity, tested signal is digital quantity, therefore can realize the calibrating of the electronic transducer calibration instrument to asynchronous input.
As a modification of the present invention, described digital waveform fitting module is the output one synchronous pps pulse per second signal in tunnel separately, is used for inputting the clock synchronous port of electronic transducer calibration instrument as the synchronizing signal in standardized digital signal source.When the present invention exports when simulating signal, digital signal and synchronous pps pulse per second signal simultaneously, can be used for the calibrating of the electronic transducer calibration instrument of synchronous input.
Digital waveform fitting module of the present invention is made up of microprocessor and storer, the process that described digital waveform fitting module is carried out digital matching is: the sinusoidal signal that microprocessor is f to frequency quantizes, within 0～T moment, function f (x) is uniformly-spaced sampled according to N, obtain the sample value of discrete series; The sampling number of the limit should meet:
N
max=min{ (B/D) * T, 2
dformula (1)
Wherein, B is the peak transfer rate between microprocessor DSP and D/A converter module DAC, and D is the input figure place of D/A converter module;
Be that Wave data rounds by D position integer by the sample value of discrete series, be stored in storer, constantly send data to D/A converter module according to transfer rate R, setting up frequency is the sinusoidal signal output of 1/T;
Every cycle match point number is N, and transfer rate R meets:
R=(N*D) T formula (2)
From formula (2) formula, the output time interval of delta t of each data point is:
Δ t=T/N formula (3)
Output sampling rate is the output frequency f of DMA
sfor:
F
s=1/ Δ t=N/T formula (4)
D/A converter module of the present invention comprises two groups of D/A unit, every group of D/A unit is formed by connecting by the first D/A converter and the second D/A converter, wherein, the first D/A converter is also connected with microprocessor, the second D/A converter is also connected with the storer of digital waveform fitting module, and the second D/A converter outputs signal to power amplifier module; Microprocessor calculates the cycle T of sinusoidal signal according to the setting value f of the frequency of output signal; Every road DA output all adopts two chip double modulation outputs, according to the amplitude of the output signal of setting, microprocessor calculates the reference voltage UREF value of D/A converter, export to the first D/A converter, the first D/A converter is as the reference input of the second D/A converter, be used for the amplitude of modulation waveform, the second D/A converter is used for modulation waveform to produce waveform signal.
As a further improvement on the present invention, the voltage follower circuit of described power amplifier module comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first amplifier A1, the first transformer T1, second voltage mutual inductor T2 and series multistage wave filter; Input voltage accesses the positive terminal of the first amplifier A1 through the first resistance R 1; The output terminal of the first amplifier A1 is connected with the former limit of the first transformer T1 and isolates output; The output terminal of the first amplifier A1 is connected with multiple filter and is accessed the negative phase end of the first amplifier A1, the 3rd resistance R 3 one end ground connection, the other end is connected with the negative phase end of the first amplifier A1, series multistage wave filter is finally the active second order filter of one-level, for direct current biasing resistance R 3 provides load capacity, simultaneously further damped alternating current signal value; The second former limit of mutual inductor T2 obtains and exchanges feedback voltage with load-side parallel connection, one end ground connection of the second mutual inductor T2 secondary, the other end is connected with the second resistance R 2 and is accessed the positive terminal of amplifier A1, so not only can effectively suppress the DC offset voltage of power amplifier but also can ensure that AC signal realizes deep negative feedback in load-side and forms.
The current output circuit of described power amplifier module comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first amplifier A1, the second amplifier A2, the first transformer T1, the 3rd current transformer T3, the 4th current transformer T4 and series multistage wave filter; The 4th current transformer T4 connects with load-side and obtains load-side feedback communication electric current, the 3rd current transformer T3 connects with the 4th current transformer T4, load-side feedback communication electric current is connected to the I/V converter being made up of the 4th resistance R 4 and the second amplifier A2, the output of I/V converter is connected with the second resistance and is accessed the positive terminal of the first amplifier A1, forms electric current and exchanges negative feedback.
The parameter that human-machine interface module of the present invention arranges Ge road output signal is amplitude, frequency and phase place.
The present invention has following embodiment:
The microprocessor of described digital waveform fitting module adopts BF533 microprocessor.
Digital message after described protocol conversion module transforms is IEC61850 numeral message.Therefore, the present invention can be used for the electronic transducer calibration instrument of calibrating support IEC61850-9-1/2/2LE agreement.
The output accuracy of the voltage and current signal of described power amplifier module output is 0.01 grade.
Described digital waveform sequence memory module adopts the SDRAM MT48LC4M16A2TG of 32M.
Compared with prior art, the present invention has following significant effect:
Modulus source of synchronising signal of the present invention adopts stored program control system to realize the output one high-precision simulating signal in road, export to synchronize with simulating signal in a road and have the digital signal that meets IEC61850 standard of ratio and the angular difference of setting with simulating signal, digital signal is that the superposed signal after the discrete series value of the discrete series value of simulating signal and the difference signal of default angular difference and ratio superposes obtains through protocol conversion, also has a synchronous pps pulse per second signal in road simultaneously.The every cycle match point of simulating signal and digital signal number is up to 50000 points, wave analysis degree is high, almost undistorted, be better than ± 0.01%RG of accuracy, be better than ± 0.01%RG/1min of degree of stability, output waveform degree of distortion are less than 0.01%, meet 0.01 grade standard, the precision of exporting synchronous pulse per second (PPS) is better than 0.5us.When simulating signal and digital signal are exported, can be used for the calibrating of the electronic transducer calibration instrument of asynchronous input simultaneously, in the time increasing synchronous pulse per second (PPS) output, can be used for the calibrating of the electronic transducer calibration instrument of synchronous input.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is that the present invention forms one of structured flowchart;
Fig. 2 be the present invention form structured flowchart two;
Fig. 3 is power amplifier module Voltage-output schematic diagram;
Fig. 4 is power amplifier module electric current output principle figure;
Fig. 5 uses the present invention to examine and determine the schematic diagram of the checking electronic type transformers of asynchronous input;
Fig. 6 uses the present invention to examine and determine the schematic diagram of the checking electronic type transformers of synchronous input.
Embodiment
As shown in Figure 1, 2, be a kind of standard module source of synchronising signal of the present invention, it comprises digital waveform fitting module, digital waveform sequence memory module, D/A converter module, power amplifier module, protocol conversion module and human-machine interface module, wherein, digital waveform sequence memory module, human-machine interface module, protocol conversion module is connected with digital waveform fitting module respectively, digital waveform fitting module also with D/A converter module, power amplifier module connects successively, digital waveform fitting module is called the waveform fitting data that are stored in digital waveform sequence memory module and is treated the simulating signal of output and carry out digital matching, by D/A converter module, this simulating signal is carried out to waveform modulated and amplitude modulation(PAM) again, make discrete signal be converted to continuous simulating signal, after power amplifier module amplification and driving, export a road voltage and current signal, output accuracy is 0.01 grade, be used for inputting the standard channel port of electronic transducer calibration instrument as standard analog signal source, and the superposed signal after the discrete series value stack of the discrete series value of the simulating signal of exporting and the difference signal of default angular difference and ratio is converted to IEC61850 numeral message by protocol conversion module, agreement is defaulted as IEC61850-9-2, can obtain the precision of the highest 32bit of being about, export from Ethernet interface the digital signal of synchronizeing with the simulating signal of standard and can support IEC61850-9-1/2/2LE agreement in a road, be used for inputting the tested access port of electronic transducer calibration instrument as standardized digital signal source, the another output of the digital waveform fitting module one synchronous pps pulse per second signal in tunnel, be used for inputting the clock synchronous port of electronic transducer calibration instrument as the synchronizing signal in standardized digital signal source.Human-machine interface module is for arranging the parameter of each road output signal, and parameter is amplitude, frequency and phase place, to control each road output signal, finishing man-machine interaction.
In the present embodiment, digital waveform sequence memory module adopts the SDRAM MT48LC4M16A2TG of 32M, digital waveform fitting module is made up of BF533 High Performance DSP (microprocessor) and the storer of ADI company, and BF533 High Performance DSP has the cpu performance of 756MHz/1512MMACs and the DMA of 12 passages; On software, use double precision algorithm to produce the Wave data of electric current and voltage and difference signal, every cycle match point number is up to 50000 points.
Digital waveform fit procedure is: the sinusoidal signal that DSP is f to frequency quantizes, and within 0～T moment, function f (x) is uniformly-spaced sampled according to N, obtains the sample value of discrete series.The sampling number of the limit should meet:
N
max=min{ (B/D) * T, 2
dformula (1)
Wherein, B is the peak transfer rate between microprocessor DSP and D/A converter module DAC, and D is the input figure place of DAC.Sampling number N more approaches N
max, the resolution of the signal of DAC output is better, and signal waveform fidelity is higher.
Be that Wave data rounds by D position integer by the sample value of discrete series, be stored in storer, provide scan address by program-controlled clock signal for storer, the data corresponding with each address represent the range value of waveform on periodic sampling point.The DMA passage that DSP is set points to this group data, sends again and again data to DAC according to specific transfer rate R, just will set up the sinusoidal signal output that frequency is 1/T at DAC end.
Suppose that every cycle match point number is N, specific transfer rate R meets:
R=(N*D) T formula (2)
From formula (2) formula, the output time interval of delta t of each data point is:
Δ t=T/N formula (3)
Output sampling rate is the output frequency f of DMA
sfor:
F
s=1/ Δ t=N/T formula (4)
If change the frequency of signal, as long as again original Wave data is calculated and replaces in sampling.
32M SDRAM is used for depositing the Wave data changing sinusoidally that will export.The interface of DSP and DAC uses High Speed Serial (SPORT mouth) to be connected, and the interface bandwidth of AD5545 reaches 50M, and its output 0.5us Time Created, because sine wave output signal is continuous, greatly dwindles and be better than 100ns Time Created.
In the time that output signal frequency is 55Hz, to be known by formula (1), it is 56818 that limit matching is now counted; In the time that output signal frequency is 45Hz, it is 65535 that limit matching is now counted.So the matching of power frequency component output waveform is counted and is defined as every cycle 50000 points, transfer rate R is now 40M.The interface bandwidth of AD5545 reaches 50M and can meet the DAC data transfer bandwidth demand of output 40M of 50,000, every cycle in the time of 50Hz.
In the present embodiment, the high-precision digital to analog converter DA that D/A converter module adopts ADI company to produce, uses two independently the D/A of 16Bit be formed by stacking the resolution that can reach 32Bit, the AD5545 of use U.S. Ya Nuode company; The output of digital waveform data is used the DMA function of DSP.D/A converter module comprises two groups of D/A unit, every group of D/A unit is formed by connecting by the first D/A converter and the second D/A converter, wherein, the first D/A converter is also connected with BF533 microprocessor, the second D/A converter is also connected with the storer of digital waveform fitting module, and the second D/A converter outputs signal to power amplifier module; BF533 microprocessor calculates the cycle T of sinusoidal signal according to the setting value f of the frequency of output signal; Every road DA output all uses two AD5545 chips to carry out double modulation output, according to the amplitude of the output signal of setting, BF533 microprocessor calculates the reference voltage UREF value of D/A converter, export to the first D/A converter, the first D/A converter is as the reference input of the second D/A converter, be used for the amplitude of modulation waveform, the second D/A converter is used for modulation waveform to produce waveform signal.
The LM12CLK high-performance power amplifier that power amplifier module adopts ADI company to produce, in order to improve security, output is used transformer isolation, automatically switches to realize wide-range with gear, and is furnished with comparatively perfect overheated, overcurrent, overvoltage protection.Generally speaking, high performance chips stage power amplifier output voltage is below +/-40V cheaply, below output current +/-10A, the output voltage of the three-phase precise power source of simulating grid is between 0～600V, output current is between 0～20A, so, cannot directly use chip scale power amplifier to drive.The accurate power amplifier module of specialty high pressure or large electric current generally adopts thick film circuit, and price is extremely expensive.The way that industry is general is to use the conversion of transformer power, both met the requirement of output HIGH voltage and large electric current, also can realize the isolation of output signal and internal circuit, but cannot transmit DC energy, this has just caused and has used the power amplifier of transformer isolation to do deep negative feedback in load-side.In the time adding that in load-side feedback resistance suppresses DC offset voltage, the drawback of bringing is the equivalent enlargement factor that greatly lowers power amplifier, and degree of stability and the load regulation of power amplifier have also declined simultaneously.Also having a kind of way is to use accurate AC sampling to return the method for survey, corrects output valve by pid algorithm, and this power amplifier output stability is affected by load characteristic, and load cannot be adjusted in real time, and its precision is subject to the impact of Alternating Current Sampling Precision and pid algorithm.
The present invention uses one to possess the degenerative circuit of AC and DC simultaneously, be the Voltage-output schematic diagram of power amplifier module as shown in Figure 3, the voltage follower circuit of power amplifier module comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first amplifier A1, the first transformer T1, second voltage mutual inductor T2 and series multistage wave filter; Input voltage accesses the positive terminal of the first amplifier A1 through the first resistance R 1; The output terminal of the first amplifier A1 is connected with the former limit of the first transformer T1 and isolates output; The output terminal of the first amplifier A1 is connected with multiple filter and is accessed the negative phase end of the first amplifier A1, the 3rd resistance R 3 one end ground connection, the other end is connected with the negative phase end of the first amplifier A1, series multistage wave filter is finally one-level second order active low-pass filter, for direct current biasing resistance R 3 provides load capacity, simultaneously further damped alternating current signal value, its excess-three level of series multistage wave filter is Butterworth filter; The second former limit of mutual inductor T2 obtains and exchanges feedback voltage with load-side parallel connection, one end ground connection of the second mutual inductor T2 secondary, the other end is connected with the second resistance R 2 and is accessed the positive terminal of amplifier A1, so not only can effectively suppress the DC offset voltage of power amplifier but also can ensure that AC signal realizes deep negative feedback in load-side.
If the former secondary no-load voltage ratio of T2 is K, transport function is:
From formula (5), the performance of power amplifier depends primarily on resistance R
1and R
2.R at present
1, R
2the precision resister that adopts Israel VISHAY, temperature is floated and is less than 1PPM, and the error producing in the time that temperature range variation 20 is spent is less than 2/10000ths, meets design requirement.
The electric current output principle figure of power amplifier module as shown in Figure 4, the current output circuit of power amplifier module comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first amplifier A1, the second amplifier A2, the first transformer T1, the 3rd current transformer T3, the 4th current transformer T4 and series multistage wave filter, series multistage wave filter is finally one-level second order active low-pass filter, and its excess-three level is Butterworth filter; The 4th current transformer T4 connects with load-side and obtains load-side feedback communication electric current, the 3rd current transformer T3 connects with the 4th current transformer T4, load-side feedback communication electric current is connected to the I/V converter being made up of the 4th resistance R 4 and the second amplifier A2, the output of I/V converter is connected with the second resistance and is accessed the positive terminal of the first amplifier A1, form electric current and exchange negative feedback, transport function is:
Because zero magnetic flux mutual inductor is at low side angular difference not so good (being about 1 point), need to carry out again software compensation.
Protocol conversion module support IEC61850-9-1 IEC61850-9-2 IEC61850-9-2LE agreement, agreement is defaulted as IEC61850-9-2, can obtain the precision of the highest 32bit of being about.
Human-machine interface module finishing man-machine interaction, arranges amplitude, frequency and the phase place of each road output signal, controls the function such as output of each road signal, uses the LX-801A industrial computer of Seatech, and liquid crystal uses 800*600TFT liquid crystal display, and keyboard uses industrial keyboard.
DSP is according to the ratio with respect to simulating signal of the matching points N of simulating signal, setting and angular difference, calculate the discrete series value of difference signal, corresponding discrete series value stack by the discrete series value of difference signal with simulating signal, and result is rounded by D position integer, be stored in storer.Another DMA passage that DSP is set points to this group data, in the time of the discrete series value output that starts simulating signal, send again and again data to DSP kernel according to identical transfer rate R, DSP kernel extracts discrete series value according to the sampling rate of setting, carry out framing according to the agreement arranging, produce IEC61850 numeral message, the passage 2 that digital message is delivered to the SPORT mouth being connected with DAC by DMA is exported, because two passages of same SPORT mouth use identical clock sync signal and frame synchronizing signal, so digital message signals is to synchronize with the discrete series value output of simulating signal.
The synchronous error of numeral message signals and simulating signal is mainly to produce the D/A conversion of simulating signal and the time delay that power amplification link is introduced, voltage signal is exported, error is less than 0.5us, current signal is exported, because zero magnetic flux mutual inductor is at low side angular difference not so good (being about 1 point), need to carry out again software compensation.
The output of Wave data is used DMA (Direct Memory Access, direct memory access) function, in the time of first of first Wave data of output, trigger pulse output, timer internal starts timing, in the time having exported a waveform, timing finishes, and pulse becomes low level; Timer is exported every 1s trigger pulse afterwards.Synchronous error is mainly that DMA startup and PPS triggering are asynchronous, is better than 100ps.
As shown in Figure 5, the present invention can examine and determine the electronic transducer calibration instrument of asynchronous input, when use, the standard channel port of standard analog signal source port connecting electronic formula mutual-inductor tester, the tested access port that standardized digital signal source port connects, electronic transducer calibration instrument is inputted in standard analog signal source and standardized digital signal source simultaneously.As shown in Figure 6, the present invention can also examine and determine the electronic transducer calibration instrument of synchronous input, except standard analog signal source port and standardized digital signal source port are as with upper type connecting electronic formula mutual-inductor tester, the clock synchronous port of synchronous pps pulse per second signal port connecting electronic formula mutual-inductor tester, standard analog signal source, standardized digital signal source and synchronous pps pulse per second signal are inputted electronic transducer calibration instrument simultaneously.
Embodiments of the present invention are not limited to this; according to foregoing of the present invention; according to ordinary skill knowledge and the customary means of this area; do not departing under the above-mentioned basic fundamental thought of the present invention prerequisite; the present invention can also make amendment, replacement or the change of other various ways, within all dropping on rights protection scope of the present invention.
Claims (10)
1. a standard module source of synchronising signal, is characterized in that: it comprises digital waveform fitting module, digital waveform sequence memory module, D/A converter module, power amplifier module, protocol conversion module and human-machine interface module, described digital waveform sequence memory module, human-machine interface module, protocol conversion module is connected with described digital waveform fitting module respectively, described digital waveform fitting module also with D/A converter module, power amplifier module connects successively, described digital waveform fitting module is called the waveform fitting data that are stored in digital waveform sequence memory module and is treated the simulating signal of output and carry out digital matching, by D/A converter module, this simulating signal is carried out to waveform modulated and amplitude modulation(PAM) again, make discrete signal be converted to continuous simulating signal, after power amplifier module amplification and driving, export a road voltage and current signal, be used for inputting the standard channel port of electronic transducer calibration instrument as the simulation signal generator of standard, and the superposed signal after the discrete series value stack of the discrete series value of the simulating signal of exporting and the difference signal of default angular difference and ratio is converted to digital message by described protocol conversion module, export the digital signal of synchronizeing with the simulating signal of standard in a road, be used for inputting the tested access port of electronic transducer calibration instrument as standardized digital signal source, described human-machine interface module is for the parameter of each road output signal is set, to control each road output signal.
2. standard module source of synchronising signal according to claim 1, it is characterized in that: described digital waveform fitting module is the output one synchronous pps pulse per second signal in tunnel separately, be used for inputting the clock synchronous port of electronic transducer calibration instrument as the synchronizing signal in standardized digital signal source.
3. standard module source of synchronising signal according to claim 2, it is characterized in that: described digital waveform fitting module is made up of microprocessor and storer, the process that described digital waveform fitting module is carried out digital matching is: the sinusoidal signal that microprocessor is f to frequency quantizes, within 0～T moment, function f (x) is uniformly-spaced sampled according to N, obtain the sample value of discrete series; The sampling number of the limit should meet:
N
max=min{ (B/D) * T, 2
dformula (1)
Wherein, B is the peak transfer rate between microprocessor and D/A converter module, and D is the input figure place of D/A converter module;
Be that Wave data rounds by D position integer by the sample value of discrete series, be stored in storer, constantly send data to D/A converter module according to transfer rate R, setting up frequency is the sinusoidal signal output of 1/T;
Every cycle match point number is N, and transfer rate R meets:
R=(N*D)/T formula (2)
From formula (2) formula, the output time interval of delta t of each data point is:
Δ t=T/N formula (3)
Output sampling rate is the output frequency f of DMA
sfor:
F
s=1/ Δ t=N/T formula (4)
4. standard module source of synchronising signal according to claim 3, it is characterized in that: described D/A converter module comprises two groups of D/A unit, every group of D/A unit is formed by connecting by the first D/A converter and the second D/A converter, wherein, the first D/A converter is also connected with microprocessor, the second D/A converter is also connected with the storer of digital waveform fitting module, and the second D/A converter outputs signal to power amplifier module; Microprocessor calculates the cycle T of sinusoidal signal according to the setting value f of the frequency of output signal; Every road DA output all adopts two chip double modulation outputs, according to the amplitude of the output signal of setting, microprocessor calculates the reference voltage UREF value of D/A converter, export to the first D/A converter, the first D/A converter is as the reference input of the second D/A converter, be used for the amplitude of modulation waveform, the second D/A converter is used for modulation waveform to produce waveform signal.
5. standard module source of synchronising signal according to claim 4, is characterized in that: the voltage follower circuit of described power amplifier module comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the first amplifier (A1), the first transformer (T1), second voltage mutual inductor (T2) and series multistage wave filter; Input voltage is through the positive terminal of the first resistance (R1) access the first amplifier (A1); The output terminal of the first amplifier (A1) is connected with the former limit of the first transformer (T1) and isolates output; The output terminal of the first amplifier (A1) is connected with multiple filter and is accessed the negative phase end of the first amplifier (A1), the 3rd resistance (R3) one end ground connection, the other end is connected with the negative phase end of the first amplifier (A1), series multistage wave filter is finally the active second order filter of one-level, for direct current biasing resistance (R3) provides load capacity damped alternating current signal value; The former limit of the second mutual inductor (T2) obtains and exchanges feedback voltage with load-side parallel connection, one end ground connection of the second mutual inductor (T2) secondary, and the other end is connected with the second resistance (R2) and is accessed the positive terminal of amplifier A1.
6. standard module source of synchronising signal according to claim 5, is characterized in that: the current output circuit of described power amplifier module comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the first amplifier (A1), the second amplifier (A2), the first transformer (T1), the 3rd current transformer (T3), the 4th current transformer (T4) and series multistage wave filter; The 4th current transformer (T4) is connected with load-side and is obtained load-side feedback communication electric current, the 3rd current transformer (T3) is connected with the 4th current transformer (T4), load-side feedback communication electric current is connected to be made up of I/V converter the 4th resistance (R4) and the second amplifier (A2), the output of I/V converter is connected with the second resistance (R2) and is accessed the positive terminal of the first amplifier (A1), forms electric current and exchanges negative feedback.
7. standard module source of synchronising signal according to claim 6, is characterized in that: the microprocessor of described digital waveform fitting module adopts BF533 microprocessor.
8. standard module source of synchronising signal according to claim 7, is characterized in that: the parameter that described human-machine interface module arranges Ge road output signal is amplitude, frequency and phase place.
9. standard module source of synchronising signal according to claim 8, is characterized in that: the output accuracy of the voltage and current signal of described power amplifier module output is 0.01 grade.
10. standard module source of synchronising signal according to claim 9, is characterized in that: the digital message after described protocol conversion module transforms is IEC61850 numeral message; Described digital waveform sequence memory module adopts the SDRAM MT48LC4M16A2TG of 32M.
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