CN113341198B - Power line wave recording method and system based on metering chip register - Google Patents
Power line wave recording method and system based on metering chip register Download PDFInfo
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- CN113341198B CN113341198B CN202110608414.2A CN202110608414A CN113341198B CN 113341198 B CN113341198 B CN 113341198B CN 202110608414 A CN202110608414 A CN 202110608414A CN 113341198 B CN113341198 B CN 113341198B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to the technical field of power transmission, and discloses a power wave recording method and system based on a metering chip register. The method comprises the following steps: taking parameter registers 00H-06H of the metering chip as waveform cache registers; setting an overflow period and starting a timer; in the timer interruption, sending an SPI sending buffer prepared in advance to an SPI corresponding DMA channel, and starting DMA transmission; judging whether the receiving cache is legal or not through checking, if so, updating global cache data, and if not, correcting and then updating the global cache data; preparing an SPI (serial peripheral interface) sending cache of next DMA (direct memory access) communication, simultaneously checking whether a metering parameter waiting to be read exists, if so, placing the metering parameter at the tail part of the SPI sending cache, and transmitting the metering parameter together when waiting for the next DMA communication; the timer interrupt ends and the DMA transfer ends. The invention has simple structure, low cost and convenient popularization.
Description
Technical Field
The invention belongs to the technical field of power transmission, and particularly relates to a power wave recording method and system based on a metering chip register.
Background
For many years, automatic fault recording of power systems has become an important basis for analyzing system accidents, particularly relay protection action behaviors. The fault recording system based on microcomputer can record the information of electric quantity and state change process before and after the power grid fault, completely reflect the instantaneous change after the fault and the action of relay protection, and has the capability of data archiving and data reanalysis. The fault recorder is particularly important as the key equipment of the system.
In the prior art, most of power systems adopt a DSP + AD mode to sample and process wave recording data, but the scheme is high in cost and not beneficial to large-scale popularization and use.
Disclosure of Invention
In order to meet the actual requirements in the technical field of power transmission, the invention overcomes the defects in the prior art, and solves the technical problems that: the low-cost power wave recording method and system based on the metering chip register are provided, so that real-time waveform sampling, analysis and storage of a three-phase power line are realized, and secondary analysis is facilitated.
In order to solve the technical problems, the invention adopts the technical scheme that: a power wave recording method based on a metering chip register comprises the following steps:
s1, taking parameter registers 00H-06H of a metering chip as waveform cache registers, wherein the parameter registers 00H-06H are respectively used for storing three-phase voltage sampling data, current sampling data and zero line current sampling data;
s2, setting an overflow period and starting a timer;
s3, in the interruption of the timer, sending an SPI sending buffer prepared in advance to a DMA channel corresponding to the SPI, and starting DMA transmission;
s4, in timer interruption, judging whether a received waveform cache is legal or not through verification, if so, updating global waveform cache data and entering step S5, if not, updating the global waveform cache data after correcting the data and entering step S5, if not, accumulating global error times, resetting a metering chip after the error times reach an upper limit, and re-performing an initialization process;
s5, preparing an SPI (Serial peripheral interface) sending cache of next DMA (direct memory access) communication in timer interruption, wherein front bytes of the SPI sending cache are reading instructions of the parameter registers 00H-06H, simultaneously checking whether a metering parameter waiting to be read exists, if so, placing the metering parameter at the tail of the SPI sending cache, and transmitting the metering parameter together when waiting for next DMA communication;
and S6, ending the timer interruption and ending the DMA transmission.
In step S2, the overflow cycle is set to 1/6400.
In step S4, the process of correcting data specifically includes the following steps:
s401, inserting the retention data of the last DMA transmission stored in the global cache into the head of the current received data, and participating in verification together with the current data;
s402, unpacking the data packet received this time, extracting effective data and updating the effective data to a global cache;
and S403, storing the data with error check in the current DMA transmission as retention data in the global cache.
In the step S4, the verification function provided by the metering chip itself is used to perform verification judgment.
The model of the metering chip is RN8302B or Kyoho photoelectric HT7132.
In addition, the invention also provides a power wave recording system based on a metering chip register, which comprises a metering chip and a microprocessor, wherein the input end of the metering chip is connected with a power line through a voltage transformer and a current transformer, the output end of the metering chip is connected with the microprocessor through SPI communication, and a computer program for executing the power wave recording method of any one of claims 1 to 5 is arranged in the microprocessor.
The electric power wave recording system based on the metering chip register further comprises a data processing and storing module, and the microprocessor is connected with the data processing and storing module through SPI communication and serial port communication.
The microprocessor is internally provided with a metering module and a wave recording module which are respectively responsible for a metering function and a wave recording function, the metering module is communicated with the wave recording module through a message queue, and the wave recording module checks whether a metering parameter waiting for reading sent by the metering module exists or not through the message queue.
When the wave recording module is in DMA communication with the metering chip, framing is carried out according to a communication protocol built in the metering chip and stored in a DMA sending buffer area in the microprocessor, and when the timing of the wave recording period is expired, a DMA sending cache in the microprocessor is sent to the metering chip through the high-speed communication interface.
The microprocessor is an ST singlechip.
Compared with the prior art, the invention has the following beneficial effects: the invention provides an electric power wave recording method and system based on a metering chip register, which utilize a parameter register of the metering chip as a waveform cache register, read waveform data stored in the parameter register through high-speed communication with the metering chip, and correct data dislocation by utilizing a calibration function of the metering chip, thereby realizing real-time sampling of three-phase data of a power line, and simultaneously ensuring the accuracy of electric energy metering and accumulation of the metering chip. Therefore, the invention provides a brand-new electric power wave recording method and system with low cost and convenient popularization, and the application range of the electric power wave recording system can be greatly improved.
Drawings
Fig. 1 is a schematic flowchart of a power wave recording method based on a metering chip register according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating data correction according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating data correction according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electric power wave recording system based on a metering chip register according to a second embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, an embodiment of the present invention provides a power wave recording method based on a metering chip register, including the following steps:
s1, taking parameter registers 00H-06H of a metering chip as waveform cache registers, wherein the parameter registers 00H-06H are respectively used for storing three-phase voltage sampling data, current sampling data and zero line current sampling data.
Specifically, the measurement chip selected in this embodiment is RN8302B, wherein the waveform cache register is replaced by the UAWAV (00H), UBWAV (01H), UCWAV (02H), IAWAV (03H), IBWAV (04H), and ICWAV (05H) of the measurement chip RN8302B, and the specific settings are described in table 1.
TABLE 1 metering chip parameter register
S2, setting an overflow period and starting a timer. Specifically, in the present embodiment, the overflow period is set to 1/6400, that is, the sampling rate is set to 6.4KHz.
And S3, in the interruption of the timer, sending the prepared SPI sending buffer to the DMA channel corresponding to the SPI, and starting DMA transmission.
S4, in the timer interruption, processing the data of the current received frame: and judging whether the received waveform cache is legal or not through checking, if so, updating global waveform cache data and entering step S5, otherwise, checking whether the waveform data can be corrected or not, if so, updating the global waveform cache data after correction and entering step S5, otherwise, accumulating global error times, resetting the metering chip after the error times reach the upper limit, and carrying out the initialization process again.
Specifically, as shown in fig. 2, in the step S4, the process of correcting the data specifically includes the following steps:
s401, inserting the retention data of the last DMA transmission stored in the legacy data buffer (arranged in the global buffer) into the head of the data received this time. The retention data of the last DMA transmission stored in the global cache is tail data analyzed by the last received frame, and due to unqualified verification, the retention data is placed in the global waveform cache to wait for the next transmission.
S402, unpacking the data packet received this time, extracting effective data and updating the effective data to a global waveform cache; the retention data of the last DMA transmission stored in the global waveform cache and the current received data participate in verification; if the verification is legal, performing global waveform cache data updating on the data, and sequentially verifying the validity of each register data until a CS verification error is encountered;
and S403, storing the data with error check in the current DMA transmission as retention data in the global cache, namely copying the data bytes which cannot be analyzed in the data packet into a legacy data cache in the global cache, and waiting for the next DMA transmission.
As shown in fig. 3, which is a schematic diagram of data correction, it is illustrated that, according to the data correction method of the present embodiment, after data is misaligned, the misaligned data can be corrected by buffering.
Specifically, in step S4, the verification function provided by the metering chip itself is used to perform verification judgment.
S5, preparing data to be read next time in timer interruption: preparing an SPI (serial peripheral interface) sending cache of next DMA (direct memory access) communication, fixing the first 36 bytes of the SPI sending cache as a reading instruction of the parameter registers 00H-06H, simultaneously checking whether metering parameters such as voltage, current, pulse and the like waiting for reading exist, if so, placing the metering parameters at the tail part of the SPI sending cache, and transmitting the metering parameters together when waiting for next DMA communication.
And S6, ending the timer interruption and ending the DMA transmission.
Specifically, in this embodiment, the model of the metering chip may also be a spring photoelectric HT7132.
In this embodiment, after the timer expires, the read command is directly started, and after the read command is completed, the next DMA send buffer is prepared, so that the phase shift error of the sampled data at each time can be reduced to the maximum extent, and the data acquisition efficiency is improved.
Example two
As shown in fig. 4, an embodiment of the present invention provides a power wave recording system based on a metering chip register, including a metering chip, a microprocessor, and a data processing storage module, where an input end of the metering chip is connected to a power line through a voltage transformer and a current transformer, an output end of the metering chip is connected to the microprocessor through SPI communication, and the microprocessor is connected to the data processing storage module through SPI communication and serial port communication. The microprocessor is internally provided with a computer program for executing the electric power wave recording method of the first embodiment.
The RN8302B metering chip is responsible for power line waveform sampling and pulse metering, sampling data are cached in a waveform cache register with 7 paths of 24bits of the RN8302B, a microprocessor reads waveform data in the waveform cache register through an SPI communication port, corrects the data through pulse accumulation and sends the data to a data processing and storing module, and in addition, the microprocessor can also realize pulse accumulation, namely, the electric energy metering function is realized, namely, the metering of power grid parameters and power grid energy is realized.
Specifically, in this embodiment, a metering module and a wave recording module are disposed in the microprocessor and respectively responsible for a metering function and a wave recording function, the metering module and the wave recording module communicate with each other through a message queue, and the wave recording module checks whether there is a metering parameter waiting for reading sent by the metering module through the message queue.
Specifically, in this embodiment, when the oscillograph module performs DMA communication with the metering chip, the oscillograph module frames according to a communication protocol built in the metering chip and stores the framed frames into a DMA send buffer in the microprocessor, and when the timing of the oscillograph cycle expires, the DMA send buffer in the microprocessor is sent to the metering chip through the high-speed communication interface.
In this embodiment, because the data transmission data volume from the Microprocessor (MCU) to the data processing and storage module (CPU) is large, the timeliness is high, the microprocessor is connected to the data processing and storage module through SPI communication and serial communication, and a mode of polling for multiple times and redundant transmission is adopted, the polling is for ensuring the timeliness, the redundancy is a compromise to the MCU side transmission mode (DMA) and the MCU Resource (RAM) limitation, because the microprocessor side has only one global cache, the cache address cannot be changed during transmission, and the transmission in the pingpong mode cannot be performed, therefore, the embodiment can achieve the effect of not missing data through the redundant transmission mode, that is, the data transmitted each time contains part of data that has been transmitted last time. In addition, the data processing and storing module can remove the data in a targeted manner to extract the effective recording data.
Specifically, in this embodiment, the metering chip may be a three-phase multifunctional anti-theft metering chip RN8302B with a sharp energy of RN8302B, which is responsible for sampling the waveform of the power line. The microprocessor is an ST single chip microcomputer, the type of the microprocessor is STM32F407, and the microprocessor is responsible for reading waveform data of the metering chip and uploading the waveform data to the data processing and storing module. The data processing and storing module can be a CPU, such as a full-log T3 quad-core Cortex-A7,8GB EMMC Flash, and is responsible for storing and secondarily analyzing recording data.
The technical difficulty of the embodiment of the invention is that: although the existing metering chip is provided with a waveform cache register, the sampling quantity of the existing metering chip is small, a WSAVECON register needs to be configured for manual zero clearing and starting, continuous real-time sampling cannot be carried out, and data dislocation is easy to occur during sampling. Taking the metering chip RN8302B as an example, the waveform cache register with 7 paths of 24bits has 768 memory cells in total. Namely, when sampling according to 128/cycle, only 1-cycle data can be sampled, and the WSAVECON register needs to be configured for manual zero clearing and starting, so that continuous real-time sampling cannot be carried out. In addition, when the RN8302B reads the register data through the SPI, it is difficult to perform read-write frame synchronization with the chip select CS, and thus there is a small probability of data misalignment. In addition, for the metering chip, the metering and accumulation of the electric energy are mainly performed, so that the electric energy metering and accumulation of the metering chip are ensured to be accurate while the ABC phase sampling data is read by the metering chip. The embodiment can solve the technical problem by improving the electric power wave recording method, namely continuous real-time sampling can be carried out, and moreover, the data dislocation condition can be corrected without influencing the electric energy metering of the metering chip. In summary, the embodiment of the present invention provides a novel power wave recording method with low cost and easy popularization.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A power wave recording method based on a metering chip register is characterized by comprising the following steps:
s1, taking parameter registers 00H-06H of a metering chip as waveform cache registers, wherein the parameter registers 00H-06H are respectively used for storing three-phase voltage sampling data, current sampling data and zero line current sampling data;
s2, setting an overflow period and starting a timer;
s3, in the timer interruption process, sending a prepared SPI sending buffer to a DMA channel corresponding to the SPI, and starting DMA transmission;
s4, in timer interruption, judging whether a received waveform cache is legal or not through verification, if so, updating global waveform cache data and entering step S5, if not, updating the global waveform cache data after correcting the data and entering step S5, if not, accumulating global error times, resetting a metering chip after the error times reach an upper limit, and re-performing an initialization process;
s5, preparing an SPI (Serial peripheral interface) sending cache of next DMA (direct memory access) communication in timer interruption, wherein front bytes of the SPI sending cache are reading instructions of the parameter registers 00H-06H, simultaneously checking whether a metering parameter waiting to be read exists, if so, placing the metering parameter at the tail of the SPI sending cache, and transmitting the metering parameter together when waiting for next DMA communication;
and S6, ending the timer interruption and ending the DMA transmission.
2. The power recording method based on the metering chip register, according to claim 1, wherein in the step S2, the overflow period is set to 1/6400.
3. The electric power wave recording method based on the metering chip register, as claimed in claim 1, wherein in the step S4, the process of correcting the data specifically includes the following steps:
s401, inserting the retention data of the last DMA transmission stored in the global cache into the head of the current received data, and participating in verification together with the current data;
s402, unpacking the data packet received this time, extracting effective data and updating the effective data to a global cache;
and S403, storing the data with error check in the current DMA transmission as retention data in the global cache.
4. The electric power wave recording method based on the metering chip register as claimed in claim 1, wherein in step S4, the verification judgment is performed through a verification function provided by the metering chip itself.
5. The method as claimed in claim 1, wherein the type of the metering chip is RN8302B or spring photo HT7132.
6. A power wave recording system based on a metering chip register is characterized by comprising a metering chip and a microprocessor, wherein the input end of the metering chip is connected with a power line through a voltage transformer and a current transformer, the output end of the metering chip is connected with the microprocessor through SPI communication, and a computer program for executing the power wave recording method of any one of claims 1 to 5 is arranged in the microprocessor.
7. The electric power recording system based on the metering chip register as claimed in claim 6, further comprising a data processing storage module, wherein the microprocessor is connected with the data processing storage module through SPI communication and serial port communication.
8. The electric power wave recording system based on the metering chip register of claim 7, wherein a metering module and a wave recording module are arranged in the microprocessor and respectively responsible for the metering function and the wave recording function, the metering module and the wave recording module communicate with each other through a message queue, and the wave recording module checks whether there is a metering parameter waiting for reading sent from the metering module through the message queue.
9. The power wave recording system based on the metering chip register of claim 8, wherein the wave recording module is configured to frame and store the framed frame to a DMA transmission buffer area in the microprocessor according to a communication protocol built in the metering chip when performing DMA communication with the metering chip, and to transmit the DMA transmission buffer in the microprocessor to the metering chip through the high-speed communication interface when the timing of the wave recording cycle is expired.
10. The power recording system based on the metering chip register as claimed in claim 6, wherein the microprocessor is an ST single chip microcomputer.
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| BRPI0901107A2 (en) * | 2009-03-05 | 2010-01-19 | Reason Tecnologia S A | Method and mechanism for identification, registration and storage of traveling wavefronts in electrical energy systems |
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