CN103969524A - Intelligent scanning electronic transformer combination unit characteristic testing method based on feedback - Google Patents
Intelligent scanning electronic transformer combination unit characteristic testing method based on feedback Download PDFInfo
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Abstract
The invention relates to an intelligent scanning electronic transformer combination unit characteristic testing method based on feedback. According to the method, a scanning strategy is dynamically adjusted based on feedback information of a combination unit, multiple paths of electronic transformer body digital signals are finally simulated, the technical barrier of semi-private communication between a transformer body and the combination unit is overcome, the defect that the electronic transformer body and the combination unit can only be tested overall is overcome, the hidden danger due to the fact that the performance of the combination unit can not be independently verified and tested is eliminated, and technical improvement of the combination unit and the electronic transformer is guaranteed. The scanning process of multiple ports of the combination unit is automatically judged based on the feedback information, the strategy is adjusted, the operation is rapid and accurate and does not need artificial judgment, and the intelligence degree of the test is high.
Description
Technical field
The invention belongs to the characteristic test field of merging unit of electronic transformer in intelligent grid (MU), for tested object be the merge cells (MU) that receives electronic mutual inductor body digital quantity signal, what relate to is a kind of intelligent scanning type merging unit of electronic transformer characteristic test method that can be based on feedback.
Background technology
Between electronic mutual inductor body and merge cells (hereinafter to be referred as MU), pass through the information such as fiber optic serial communications sampled value, mutual inductor state, current, owing to there is no codes and standards, this agreement is carried out to standardization, thereby host-host protocol is in " half is privately owned " state, this has just brought restriction to test, the body of mutual inductor and MU can only be done to the as a whole performance test of carrying out.Integrated testability is no doubt important, but MU is as the equipment of an independent operating, the performance of its data synchronization processing, stable state amplitude and phase accuracy, definitely time-delay characteristics, message output discreteness, the characteristic of Software Integration algorithm, transient characterisitics etc. are all the links that must carry out independent studies test.Replace monomer test meeting that MU self performance cannot effectively be verified with integrated testability, the problem existing may be covered by the net result of integrated testability, hide some dangers for, in the time that integrated testability is not up to standard, be unfavorable for location and the solution of problem, on long terms, can limit the deep development of MU correlation technique.Along with situation about being used in conjunction with between the electronic mutual inductor of domestic different manufacturers and combiner is more and more, the demand of merge cells independent test is more and more urgent, thereby, must launch independently performance test to the MU that receives the input of electronic mutual inductor body digital quantity.
At present domestic electronic mutual inductor body output is fiber optic serial communication, the transmission bandwidth of different manufacturers and sampling rate are discrepant, bandwidth has tri-kinds of 1.6Mbit/s, 2.0Mbit/s, 4.0Mbit/s, and sampling rate has every cycle 80 points, 100 points, 200 points, 256 4 kinds.Concrete which kind of bandwidth, which kind of sampling rate adopting of the mutual inductor of different manufacturers has been disclosed information at present, but the self-defining and disclosed private information of being unwilling that is each family such as the definition of serial data frame length, Frame byte implication, byte position, " half is privately owned " state that Here it is communicates by letter between current mutual inductor body and MU is the maximum technology barrier of MU monomer test.
From the Steady state and transient state characteristic test angle of MU, most critical be the sampled value information that need to apply an electronic mutual inductor body to MU, other information contents are irrelevant with test.If can get the Frame length that electronic mutual inductor body sends, and can find the deviation post of corresponding sampled value in Frame, can simulate transmission to the sampled value of electronic mutual inductor body, by the output of the requirement control sampled value of testing experiment, thereby MU is launched to every Steady state and transient state characteristic test.
Summary of the invention
For the deficiency in prior art, the object of the invention is to propose a kind of intelligent scanning merging unit of electronic transformer characteristic test method that can be based on feedback, the method has been abolished the technology barrier of communicate by letter between mutual inductor body and merge cells " half is privately owned ", for the technology of merge cells self and electronic mutual inductor entirety provides important leverage.
For achieving the above object, technical scheme of the present invention is:
Merging unit of electronic transformer carries out a method of testing for independent test, and its method is: configuration before (1) scanning; First, the starting condition of configuration scanning, the scope of described starting condition bandwidth, sampling rate, frame length, or the information such as known parity checking, cyclic redundancy check (CRC) code (Cyclic Redundancy Check is called for short CRC) mode.
(2) all input ports of scanning MU; Start after scanning, the PowerPC processor first passage effective marker bit scan based on MU feedback goes out data frame length, and then the channel data scan value based on MU feedback goes out the offset address of AC sampling value, successively all input ports of MU is completed to above-mentioned scanning; In the time having at least an input port to scan successfully, enter step (3), otherwise test finishes.
(3) test phase of MU; After scanning is successfully completed, enter the test phase to MU, according to the requirement of MU characteristic test, the method for the test phase of its MU comprises as follows:
(3a) steady-state method of test; First enter steady state test, in the time of steady state test, control electronic mutual inductor and simulate all test relevant informations such as the sampled value amplitude of output, frequency, effective value, phase place, harmonic wave, output channel sum, frame loss rate, frame losing mode, and using the signal of this minor mutual inductor simulation output of electricity as standard signal, using the MU output sampled value information receiving as test product information, complete all test jobs that steady-state behaviour is relevant;
(3b) transient test, then, after completing, steady state test enters the transient test stage, by testing software according to the concrete transient characterisitics index of MU, single energising as required in information configuration relay protections such as transient state grade, time constant, specified symmetrical short-circuit electric current multiples or two energising transient test amounts, using the value of output as standard source signal, the sampled value of MU output, as test product signal, completes the performance test that transient state is relevant.
Technique effect of the present invention is:
The present invention is that the feedback information based on merge cells is dynamically adjusted scanning strategy, finally simulates the electronic mutual inductor body digital quantity signal of multichannel, has abolished the technology barriers of communicate by letter between mutual inductor body and merge cells " half is privately owned ".And scanning process by multiport is based on feedback information automatic discrimination and adjust strategy, quick and precisely and without artificial differentiation, the intelligent degree of test is high; It can quantitative configuration multichannel electronic mutual inductor body simulation output, for every Steady state and transient state test of merge cells provides required sampled value information arbitrarily; And can carry out independent test for merging unit of electronic transformer, eliminate the deficiency that mutual inductor body and merge cells integrated testability exist, eliminate the hidden danger that merge cells self performance cannot independent test be buried, for the technology of merge cells self and electronic mutual inductor entirety provides safeguard.
In addition, hardware structure combines powerful data processing and the communication capacity of PowerPC processor, and powerful sequential control and the logical operation capability of FPG, be multiport intelligent scanning, MU packet parsing, Steady state and transient state data processing provides strong guarantee.The method is not subject to the restriction of the concrete producer of merge cells, model and output protocol, is not subject to the restriction of the concrete principle of electronic mutual inductor, producer and model, has great versatility.
Brief description of the drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the intelligent scanning type merging unit of electronic transformer characteristic test system structural representation that the present invention is based on feedback;
Fig. 2 is the process flow diagram that the present invention tests;
Fig. 3 is the single port data frame length scanning process figure of this law.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Referring to Fig. 1 to Fig. 3, the method of testing of carrying out independent test for merging unit of electronic transformer of the present embodiment, it is a kind of intelligent scanning type merging unit of electronic transformer characteristic detecting method based on feedback, the method for tested object be the merge cells (MU) that receives electronic mutual inductor body digital quantity signal, what relate to is that one can automatic imitation electronic mutual inductor body digital output, and then MU is launched to the method for testing of every test, it is that feedback information based on merge cells is dynamically adjusted scanning strategy, obtain the Frame length that electronic mutual inductor body sends, find the deviation post of corresponding sampled value in Frame, the sampled value of electronic mutual inductor body is simulated to transmission, finally simulate the electronic mutual inductor body digital quantity signal of multichannel, the technology barriers of communicate by letter between mutual inductor body and merge cells " half is privately owned " are abolished.The scanning process of merge cells multiport is based on feedback information automatic discrimination and adjust strategy, quick and precisely and without artificial differentiation, the intelligent degree of test is high.
The present embodiment will carry out independent test to the merge cells of electronic mutual inductor, must solve " half the is privately owned " problem of communicating by letter between mutual inductor body and merge cells, apply tested number so that be combined unit, the communication of domestic all producers is at present fiber optic serial communication, optic communication device is Universal Receiver Transmitter part, optical wavelength is 820nm～860nm, optical fiber is the multimode optical fiber of 62.5/125um, the strength range of light transmission and light-receiving is also wider, and this makes the connection of Physical layer very easy.
At present, there is three kinds of situation: 1.6Mbit/s, 2.0Mbit/s, 4.0Mbit/s in the baud rate of electronic mutual inductor serial communication, and sampling rate exists four kinds of situation: 4kHz, 5kHz, 10kHz, 12.8kHz.Each character forms by 11, and 1 start bit is " 0 ", 8 data bit, and 1 parity check bit, 1 position of rest is " 1 ":
Serial data frame structure is:
Wherein, what parity check bit adopted is odd or even parity check, CRC(cyclic redundancy check (CRC) code, CyclicRedundancy Check) be summation or summation negate, the occurrence of total amount of byte N, and the implication of each byte, it is privately owned that the implication of each byte position is each producer, and this is the maximum technology barrier of MU independent test.
Based on above-mentioned situation, the present invention sets up a set of test macro using PowerPC and FPGA as primary processor, and structural representation is shown in Fig. 1.System multichannel electronic mutual inductor simulation output, sets up Physical layer with MU and is connected, and receives the standard output of MU as the feedback information of system simultaneously.The simulation output of multichannel electronic mutual inductor is completed assignment, parity checking, CRC check, the frame length control of serial communication data frame by PowerPC, and the work such as the decision-making of sending strategy, complete the sequential control of serial data Physical layer by FPGA, by the synchronization module of High Accuracy Constant Temperature crystal oscillator construction system, the sequential benchmark of FPGA is provided, guarantee the degree of accuracy of the sequential of serial communication, reduce time error and bring impact to test.
FT3 fiber optic serial data or the IEC61850-9-1 of MU output, the fiber optic Ethernet data receiver of IEC61850-9-2 carries out interface by FPGA equally, the packet of reception is given to PowerPC by FPGA, carry out unpacking of packet and extract the passage effective marker position that MU sends by PowerPC, passage effective marker position representing the passage of the current electronic mutual inductor body input that MU differentiates and data whether effectively correct, so detecting, the effective marker position of feeding back by MU just can learn that whether current electronic mutual inductor simulation output is effectively correct, by this close-loop feedback, PowerPC can finally determine the correct information such as data frame length and checking mode.
Finally to apply AC sampling value information to MU to the test of MU, so scan without all byte implications to Frame, after scanning successfully based on above-mentioned data frame structure, start to apply of ac by the output of PowerPC control simulation from initial offset position, whether there is data channel to have of ac by detecting in MU output, show that whether current deviation post is correct, if there is multi-channel sampling value, can obtain passage corresponding relation simultaneously.
The overall flow of testing software is shown in Fig. 2, and the configuration information of the present invention's test comprises transient state grade, specified symmetrical short-circuit electric current multiple, short-circuit current size, has stream time, the content without stream time, DC component, direct current damping time constant.Its method of testing specifically comprises as follows:
(1) configuration before scanning; By the starting condition of testing software configuration scanning, as the scope of bandwidth, sampling rate, frame length, or the information such as known parity checking, CRC mode.
(2) all input ports of the merge cells of scanning electron formula mutual inductor; In the present embodiment, the configuration effort before first testing software scans, is divided into data frame length scanning and sampled value offset address two stages of scanning to the scanning of MU port.Its method is as follows:
(2a) start after scanning, the PowerPC processor first passage effective marker bit scan based on merge cells feedback goes out data frame length.Fig. 3 is the scanning process of single port being carried out to data frame length, due to the unknown of parity check sum CRC generating mode, scanning is according to " odd, CRC sue for peace pattern ", " odd, CRC summation negate pattern ", " even parity check, CRC sue for peace pattern ", " even parity check, CRC summation negate pattern " four patterns are carried out successively.
Under every kind of pattern, initial frame length is since 5 bytes, FPGA(field programmable gate array, FieldProgrammable Gate Array) send Frame and continue time of 0.2s, with the routing restoration or position, the effective marker position acknowledging time that ensure that enough MU may exist, whether Acquisition channel effective marker position the message feeding back from MU in real time in process of transmitting, confirm has zone bit to become 1 from 0 at startup FPGA after MU sends data.For FT3 message, in the status word 1 of passage effective marker position from data block 3 and status word 2, extract; For IEC61850-9-1 message, from message the 8th status word that byte starts 1 reciprocal and status word 2, extract; For IEC61850-9-2 message, from the data quality word of each data channel, extract.If without any zone bit set, data frame length is added to 1, restart the process of transmitting of a new round, continue 0.2s, the passage effective marker position that still continues to monitor MU is scanned successfully determining whether.When frame length reaches 100 bytes when still unsuccessful, illustrate and under present mode, scan unsuccessfully, be transferred to next pattern and continue scanning.As long as judged position, passage effective marker position in scanning process, show that frame length scans successfully.
(2b) the channel data scan value of PowerPC processor based on merge cells feedback goes out the offset address of AC sampling value, and all input ports that are combined successively unit complete above-mentioned scanning; In the time having at least an input port to scan successfully, enter step (3), otherwise test finishes.
After port frame long scan success, enter into sampled value offset address sweep phase, process flow diagram is shown in Fig. 3.At present, first from offset address 0, in two continuous bytes, fill in AC sampling value information, send after sampled value information to MU, each the data channel sampled value information of data centralization Real-Time Monitoring feeding back to from MU, when not having arbitrary passage to occur of ac in the output of MU simultaneously, offset address is added to 1, still on current and next successive byte position, fill in AC sampling value and send to MU, repeat said process, until scan most end two bytes of frame length.In scanning process, need only any one data channel of MU and occurred AC sampling value, the offset address that the offset address that can conclude current transmission is sampled value, and the corresponding relation between the data channel of clear and definite and MU output, the end of scan of this port to MU.
(3) test phase of MU; After scanning is successfully completed, enter the test phase to MU, it is mainly divided into steady state test and the large class of transient test two according to the requirement of MU characteristic test, and it comprises as follows:
(3a) steady-state method of test: first enter steady state test, in the time of steady state test, by all test relevant informations such as the sampled value amplitude of testing software control electronic mutual inductor simulation output, frequency, effective value, phase place, harmonic wave, output channel sum, frame loss rate, frame losing modes, testing software by output signal as standard signal, using the output sampled value information of the MU receiving as test product information, complete all test jobs that steady-state behaviour is relevant.
In the present embodiment, the index of steady state test comprises ratio, phase differential, combination misalignment, definitely delay time, the message shake time, specified delay time, harmonic wave accuracy, signal to noise ratio (S/N ratio) etc., after to the end of scan of all of the port, enter into the steady state test process to MU, testing software is according to steady state test functional requirement, total way of the sampled value sending to MU is set, the frequency of of ac, amplitude, phase place, harmonic wave, to complete the ratio under MU stable state, angular difference, combination misalignment, definitely delay time, specified delay time, message dispersion, signal to noise ratio (S/N ratio), harmonic wave precision, integral accuracy, punctual precision, the a series of index tests of multi-channel synchronous etc.Can carry out the communication abnormality situations such as quantitative frame losing, wrong frame, sticky frame, to evaluate and test the processing power of MU simultaneously.
(3b) transient test method: then, after completing, steady state test enters the transient test stage, by testing software according to the concrete transient characterisitics index of MU, according to single energising as required in transient characterisitics indication information configuration transient tests such as transient state grade, time constant, specified symmetrical short-circuit electric current multiples or two energising transient test amounts, using the value of output as standard source signal, the sampled value of MU output, as test product signal, completes the performance test that transient state is relevant.
The index of the transient test of the present embodiment comprises transient error electric current, maximum current peak error, combination misalignment, damping time constant error, transient state delay time etc., its transient test concrete grammar is: after steady state test completes, can enter the transient test link of MU, be switched on or two energising transient test amounts by testing software according to the required single of the information configuration relay protections such as the transient state grade of MU, time constant, specified symmetrical short-circuit electric current multiple.Obtain the maximum instantaneous peak error under MU transient state, time constant error, combination misalignment, integration transient characterisitics, all transient state indexs such as transient state time delay by record ripple and data analysis; Thereby complete all merging unit of electronic transformer characteristic test processes.
Based on above-mentioned, the scanning process of the present invention by multiport is based on feedback information automatic discrimination and adjust strategy, quick and precisely and without artificial differentiation, the intelligent degree of test is high; It can quantitative configuration multichannel electronic mutual inductor body simulation output, for every Steady state and transient state test of merge cells provides required sampled value information arbitrarily; And can carry out independent test for merging unit of electronic transformer, eliminate the deficiency that mutual inductor body and merge cells integrated testability exist, eliminate the hidden danger that merge cells self performance cannot independent test be buried, for the technology of merge cells self and electronic mutual inductor entirety provides safeguard.
And the present invention is that the feedback information based on merge cells is dynamically adjusted scanning strategy, finally simulates the electronic mutual inductor body digital quantity signal of multichannel, the technology barriers of communicate by letter between mutual inductor body and merge cells " half is privately owned " are abolished.On hardware structure, combine powerful data processing and the communication capacity of PowerPC processor, and powerful sequential control and the logical operation capability of FPG, for multiport intelligent scanning, MU packet parsing, Steady state and transient state data processing provides strong guarantee.The method is not subject to the restriction of the concrete producer of merge cells, model and output protocol, is not subject to the restriction of the concrete principle of electronic mutual inductor, producer and model, has great versatility.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback, is characterized in that, its method is: configuration before (1) scanning; First the starting condition of configuration scanning;
(2) all input ports of the merge cells of scanning electron formula mutual inductor; Its method step is as follows:
(2a) start after scanning, the PowerPC processor first passage effective marker bit scan based on merge cells feedback goes out data frame length;
(2b) the channel data scan value that then PowerPC processor feeds back based on merge cells goes out the offset address of AC sampling value, and all input ports that are combined successively unit complete above-mentioned scanning; In the time having at least an input port to scan successfully, enter step (3), otherwise test finishes;
(3) test phase of merge cells; After scanning is successfully completed, enter the test phase that is combined unit, according to the requirement of merge cells characteristic test, the method for the test phase of its merge cells comprises as follows:
(3a) steady-state method of test: first enter steady state test, in the time of steady state test, control all test relevant informations of electronic mutual inductor simulation output, and using the signal of this minor mutual inductor simulation output of electricity as standard signal, using the output sampled value information of the merge cells receiving as test product information, complete all test jobs that steady-state behaviour is relevant;
(3b) transient test method: then, after completing, steady state test enters the transient test stage, by testing software according to the concrete transient characterisitics index of MU, according to the required single energising of transient characterisitics indication information configuration transient test or two energising transient test amounts, using the value of output as standard source signal, the sampled value of merge cells output, as test product signal, completes the performance test that transient state is relevant.
2. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, described starting condition comprises the scope of bandwidth, sampling rate, frame length, or the information of known parity checking, cyclic redundancy check (CRC) code mode.
3. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, in described step (3a), described test relevant information comprises sampled value amplitude, frequency, effective value, phase place, harmonic wave, output channel sum, frame loss rate and frame losing mode.
4. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, described step (3b)) in, above-mentioned transient characterisitics indication information comprises transient state grade, time constant and specified symmetrical short-circuit electric current multiple.
5. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, in described step (3), multichannel electronic mutual inductor simulation output is set up Physical layer with merge cells and is connected, and receives the standard output of merge cells as the feedback information of system simultaneously; The simulation output of multichannel electronic mutual inductor is completed assignment, parity checking, cyclic redundancy check (CRC) code verification, the frame length control of serial communication data frame by PowerPC processor, and the decision-making work of sending strategy, the simulation output of multichannel electronic mutual inductor also completes the sequential control of serial data Physical layer by FPGA, and by the synchronization module of High Accuracy Constant Temperature crystal oscillator construction system, the sequential benchmark of FPGA is provided, guarantees the degree of accuracy of the sequential of serial communication.
6. the intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, in described step (2a), the passage effective marker bit scan of PowerPC processor based on merge cells feedback goes out data frame length, its concrete grammar is: FT3 fiber optic serial data or the IEC61850-9-1 of merge cells output, the fiber optic Ethernet data receiver of IEC61850-9-2 carries out interface by FPGA equally, the packet of reception is given to PowerPC processor by FPGA, carry out unpacking of packet and extract the passage effective marker position that MU sends by PowerPC processor, passage effective marker position representing the passage of the current electronic mutual inductor body input that merge cells differentiates and data whether effectively correct, so detecting, the effective marker position of feeding back by MU just can learn that whether current electronic mutual inductor simulation output is effectively correct, by this close-loop feedback, PowerPC processes the information that can finally determine correct data frame length and checking mode.
7. a kind of intelligent scanning merging unit of electronic transformer characteristic detecting method based on feedback according to claim 1, it is characterized in that, in described step (2b), the test that is combined unit is finally to apply AC sampling value information to merge cells, scan without all byte implications to Frame, after scanning successfully based on above-mentioned data frame structure, start to apply of ac by the output of PowerPC processor control simulation from initial offset position, by whether having data channel to have of ac in the output of combining data detection unit, show that whether current deviation post is correct, if there is multi-channel sampling value, obtain passage corresponding relation simultaneously.
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