CN115102275A - Self-adaptive adjustment method and device for data acquisition channel of power system - Google Patents
Self-adaptive adjustment method and device for data acquisition channel of power system Download PDFInfo
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- CN115102275A CN115102275A CN202210469782.8A CN202210469782A CN115102275A CN 115102275 A CN115102275 A CN 115102275A CN 202210469782 A CN202210469782 A CN 202210469782A CN 115102275 A CN115102275 A CN 115102275A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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Abstract
The invention discloses a self-adaptive adjusting method and a self-adaptive adjusting device for a data acquisition channel of a power system, wherein the method comprises the following steps: acquiring an actual temperature detection value of the CPU; acquiring sampling coefficients respectively corresponding to a plurality of data acquisition channels according to the actual temperature detection value; and carrying out dynamic compensation of sampling errors on the data acquisition channel according to the sampling coefficient. By monitoring the temperature of the CPU, the initial error of each data sampling channel when the device is powered on is recorded, and each sampling channel is adaptively adjusted along with the change of the temperature, so that the protection and metering precision is improved, the frequent starting of a digital control protection system adopting a break variable starting element is avoided to a certain extent, and the false exit probability of the digital control protection system is reduced.
Description
Technical Field
The invention relates to the technical field of data detection of power equipment, in particular to a method and a device for adaptively adjusting a data acquisition channel of a power system.
Background
In a digital control protection system, on-site physical quantities are generally transmitted to an acquisition system through sensors of voltage, current and the like, and how to acquire a plurality of different signals on the same channel becomes the core of universal data acquisition. Signal conditioning circuits are generally required to convert the collected non-voltage signals into voltage signals that can be recognized by the a/D converter. In the data acquisition process, the switch is required to gate to determine which channel signal is acquired, and the analog input block diagram is shown in fig. 1.
According to the design principle and thought, after the input signal of the sensor enters the acquisition module, the input signal is filtered and amplified through the signal conditioning module, the frequency range of the input signal is conditioned to be suitable for the frequency range acquired by the acquisition system, meanwhile, impedance transformation is carried out on the input signal, then the input signal enters the analog change-over switch to carry out channel selection switching, and finally, the input signal is sequentially sent to the A/D conversion module to carry out A/D conversion.
In a digital control protection system, a preceding stage signal conditioning circuit is required to amplify a signal, a special operational amplifier is generally used in an amplification circuit, the operational amplifier has zero drift and temperature drift due to inherent characteristics, and a large deviation of an acquisition result to the control protection system is caused by errors generated in the use of an analog-to-digital converter (ADC), and a typical conversion characteristic curve of a DSP2812 is shown in fig. 2.
The quantization error of the ADC can be eliminated by means of median filtering. The zero drift and the temperature drift generated by the operational amplifier are eliminated by generally using a two-point calibration method, namely two-point fixed voltages are used as references, an offset error and a gain error are obtained through calculation, and a conversion result is correspondingly compensated, so that the precision of a data acquisition system is improved. According to the actual conversion characteristic curve of the ADC, assuming that the actual gain is ma and the actual offset is b, the following equation is satisfied between the analog input X and the digital output Y:
Y＝m a *X+b (1)
at this time, by introducing the analog input X1 and X2 of the two accurate reference sources, the actual gain ma and the actual offset b can be obtained by solving the linear equation of two-variables (2), and the calibrated data of the analog input of any channel can be calculated according to the expression (1).
Y 1 ＝m a *X 1 +b (2)
Y 2 ＝m a *X 2 +b (3)
The current protection control device generally performs zero drift correction and coefficient correction before the device leaves factory or before the device is put into operation. The zero drift correction means that zero drift is measured before the device leaves the factory or is put into operation and is solidified in the protection device as a fixed value. In actual operation, the protection device subtracts this fixed zero drift value each time it samples. The coefficient correction means that before the device leaves factory or is put into operation, an external standard power supply is used for calibration, and the correction coefficient of each channel is taken as a fixed value to be fixed in the protection device. In actual operation, the protection device takes this correction factor into account each time it samples. The method does not take into account the correction of the deviations produced by the aging of the components of the acquisition circuit with temperature as the operating age increases.
Disclosure of Invention
The invention aims to provide a self-adaptive adjusting method and a self-adaptive adjusting device for a data acquisition channel of an electric power system.
In order to solve the above technical problem, a first aspect of the embodiments of the present invention provides a method for adaptively adjusting a data acquisition channel of an electric power system, including the following steps:
acquiring an actual temperature detection value of the CPU;
acquiring sampling coefficients respectively corresponding to a plurality of data acquisition channels according to the actual temperature detection value;
and carrying out dynamic compensation of sampling errors on the data acquisition channel according to the sampling coefficient.
Further, before acquiring the actual temperature detection value of the CPU, the method further includes:
and carrying out error calibration on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relation of each data acquisition channel.
Further, the error calibration is performed on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relationship of each data acquisition channel, and the method specifically includes the following steps:
applying a nominal current value or a nominal voltage value to each of the data acquisition channels based on the standard test source;
acquiring a plurality of cycle sampling data corresponding to a first preset temperature, and calculating the average value of the cycle sampling data to be used as a standard output waveform of a cycle;
adjusting the environment temperature to a second preset temperature value, acquiring the temperature recorded by a CPU and actual output values of a plurality of continuous cycles of each data acquisition channel, and calculating an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and calculating the sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is calculated.
Further, the range of the second preset temperature value is from the lowest temperature to the highest temperature which can be adapted by the data acquisition channel of the power system.
Further, the sampling coefficient is an average value of actual output/standard output in one cycle at the second preset temperature value.
Correspondingly, a second aspect of the embodiments of the present invention provides an adaptive adjustment device for a data acquisition channel of an electric power system, including:
the temperature detection module is used for acquiring an actual temperature detection value of the CPU;
the data calculation module is used for acquiring sampling coefficients corresponding to a plurality of data acquisition channels according to the actual temperature detection value;
and the data compensation module is used for carrying out dynamic compensation on the sampling error of the data acquisition channel according to the sampling coefficient.
Further, the adaptive adjusting device for the data acquisition channel of the power system further comprises:
and the coefficient calculation module is used for carrying out error calibration on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relation of each data acquisition channel.
Further, the coefficient calculation module includes:
a test unit for applying a nominal current value or a nominal voltage value to each of the data acquisition channels based on the standard test source;
the first calculating unit is used for acquiring a plurality of cycle sampling data corresponding to a first preset temperature, and calculating the average value of the cycle sampling data as a standard output waveform of one cycle;
the second calculation unit is used for adjusting the ambient temperature to a second preset temperature value, acquiring the temperature recorded by the CPU and actual output values of a plurality of continuous cycles of each data acquisition channel, and calculating an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and the third calculating unit is used for calculating the sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is obtained.
Further, the range of the second preset temperature value is from the lowest temperature to the highest temperature that the data acquisition channel of the power system can adapt to.
Further, the sampling coefficient is an average value of an actual output waveform/a standard output waveform in one cycle at the second preset temperature value.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the at least one processor to execute the power system data acquisition channel adaptive adjustment method.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the method for adaptively adjusting a data acquisition channel of a power system is implemented.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
by monitoring the temperature of the CPU, the initial error of each sampling channel when the device is powered on is recorded, and each sampling channel is adaptively adjusted along with the change of the temperature, so that the protection and metering precision is improved, the frequent starting of a digital control protection system adopting a break variable starting element is avoided to a certain extent, and the false exit probability of the digital control protection system is reduced.
Drawings
FIG. 1 is a block diagram of a data analog input provided by an embodiment of the present invention;
FIG. 2 is a graph of a transfer characteristic provided by an embodiment of the present invention;
FIG. 3 is a functional block diagram of an analog input provided by an embodiment of the present invention;
fig. 4 is a flowchart of a method for adaptively adjusting a data acquisition channel of an electrical power system according to an embodiment of the present invention;
fig. 5 is a flowchart of adaptive rectification of an acquisition channel according to an embodiment of the present invention;
FIG. 6 is a graph of sampling coefficient versus temperature provided by an embodiment of the present invention;
fig. 7 is a block diagram of a module of a data acquisition channel adaptive adjustment device of an electric power system according to an embodiment of the present invention;
fig. 8 is a block diagram of a coefficient calculation module according to an embodiment of the present invention.
Reference numerals are as follows:
1. the device comprises a coefficient calculation module 11, a test unit 12, a first calculation unit 13, a second calculation unit 14, a third calculation unit 2, a temperature detection module 3, a data calculation module 4 and a data compensation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The measurement sampling loop of the digital control protection system is composed of a series of components such as a resistor and a capacitor, an input measurement sampling signal is accessed to an ADC chip through the transmission of the components, an FPGA control bus transmits sampling data cached by a dual-port SRAM to a storage SRAM through a right port, so that the sampling storage of the data is completed, after the whole sampling process is finished, the FPGA restores the bus control right to a CPU, and the CPU can process or send the stored data outwards.
Referring to fig. 3 and fig. 4, a first aspect of the embodiments of the present invention provides a method for adaptively adjusting a data acquisition channel of an electrical power system, including the following steps:
s200, acquiring an actual temperature detection value of the CPU;
s300, acquiring sampling coefficients corresponding to a plurality of data acquisition channels respectively according to the actual temperature detection value;
and S400, dynamically compensating the sampling error of the data acquisition channel according to the sampling coefficient.
Further, before acquiring the actual temperature detection value of the CPU in step S200, the method further includes:
s100, error calibration is carried out on the plurality of data acquisition channels through a standard test source, and the temperature-sampling coefficient corresponding relation of each data acquisition channel is obtained.
Further, in step S100, performing error calibration on a plurality of data acquisition channels by using a standard test source to obtain a temperature-sampling coefficient corresponding relationship of each data acquisition channel, specifically including the following steps:
s110, applying a rated current value or a rated voltage value to each data acquisition channel based on a standard test source;
s120, acquiring a plurality of cycle sampling data corresponding to the first preset temperature, and calculating the average value of the cycle sampling data to be used as a standard output waveform of a cycle;
s130, adjusting the environment temperature to a second preset temperature value, acquiring the temperature recorded by the CPU and actual output values of a plurality of continuous cycles of each data acquisition channel, and calculating an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and S140, calculating a sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is obtained.
Specifically, the range of the second preset temperature value is from the lowest temperature to the highest temperature that the data acquisition channel of the power system can adapt to.
In a specific manner of the embodiment of the present invention, referring to fig. 5, the specific steps of the above process example are as follows:
1. applying a rated current value or a rated voltage value by using a standard test source for each data acquisition channel, recording the current temperature t1, continuously recording n (n is any integer from 1 to 10) cycle sampling data, and calculating the average value of the corresponding sampling data in one cycle to be used as the standard output waveform of one cycle;
2. and (3) placing the equipment in a temperature change box, adjusting the temperature to be t2, reading the temperature recorded by the CPU and the actual output value of continuous n cycles of each sampling loop, and calculating the average value of the sampling data in one cycle as the corresponding output waveform of the next cycle of the temperature t 2.
3. And calculating a sampling coefficient gamma j (j is 1 to the number m of sampling channels of the device) at the temperature point t 2.γ is defined as the average of the actual output/standard output over one cycle at a temperature of t 2.
4. And (5) repeating the steps 5 and 6 to obtain a corresponding relation table of sampling coefficients and temperatures of different channels.
Specifically, the curves of adjacent temperature intervals are approximately in direct proportion. As shown in FIG. 6, the temperature is between T1 and T2, the function curve of coefficient and temperature is S1, T2 and T3 are S2, and T3 is S3. The slopes k1, k2, k3, and the intercepts b1, b2, b3 of the straight lines between the two temperature points are calculated, respectively. The fitted curve is stored in the device.
Further, the temperature test range is ta-tb ℃. the temperature ta is the lowest temperature which can be adapted by the device, and the temperature tb is the highest temperature which can be adapted by the device. For example: the temperature testing range can be-25-55 ℃.
In addition, the principle of the determined temperature test points is to cover the lowest temperature that the device can adapt to the highest temperature that the device can adapt to, and each temperature interval is Δ t ℃ (n takes any integer from 1 to 10). For example: each temperature interval may take 0.5 ℃.
Specifically, the sampling coefficient is an average value of actual output/standard output within one cycle at the second preset temperature value.
According to the self-adaptive adjustment method for the data acquisition channels of the power system, the initial errors of the sampling channels when the device is powered on are recorded by monitoring the temperature of the CPU, and the sampling channels are self-adaptively adjusted along with the change of the temperature, so that the protection and metering precision is improved, frequent starting of a digital control protection system adopting a break variable starting element is avoided to a certain extent, and the probability of false exit of the digital control protection system is reduced. The method is simple and effective, has high response speed and high reliability, is not influenced by frequency change, and has better applicability. In addition, hardware expenditure is not needed, the defects of a hardware measuring method are overcome, errors caused by device factors of a hardware loop are eliminated, and the protection and metering precision is improved.
Accordingly, referring to fig. 7, a second aspect of the embodiments of the present invention provides an adaptive adjustment device for a data acquisition channel of an electric power system, including:
a temperature detection module 2 for acquiring an actual temperature detection value of the CPU;
the data calculation module 3 is used for acquiring sampling coefficients corresponding to a plurality of data acquisition channels respectively according to the actual temperature detection value;
and the data compensation module 4 is used for dynamically compensating the sampling error of the data acquisition channel according to the sampling coefficient.
Further, the adaptive adjusting device for the data acquisition channel of the power system further comprises:
and the coefficient calculation module 1 is used for carrying out error calibration on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relation of each data acquisition channel.
Further, referring to fig. 8, the coefficient calculating module 1 includes:
a test unit 11 for applying a rated current value or a rated voltage value to each data acquisition channel based on a standard test source;
the first calculating unit 12 is configured to obtain a plurality of cycle sampling data corresponding to a first preset temperature, and calculate an average value of the cycle sampling data as a standard output waveform of a cycle;
the second calculating unit 13 adjusts the ambient temperature to a second preset temperature value, obtains the temperature recorded by the CPU and the actual output values of a plurality of continuous cycles of each data acquisition channel, and calculates an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and the third calculating unit 14 is configured to calculate a sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is calculated.
Further, the range of the second preset temperature value is from the lowest temperature to the highest temperature that the data acquisition channel of the power system can adapt to.
Further, the sampling coefficient is an average value of an actual output waveform/a standard output waveform in one cycle at the second preset temperature value.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, and the instructions are executed by the processor to enable at least one processor to execute the adaptive adjustment method for the data acquisition channel of the power system.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the instructions, when executed by a processor, implement the above-mentioned adaptive adjustment method for data acquisition channels of a power system.
The embodiment of the invention aims to protect a self-adaptive adjusting method and a self-adaptive adjusting device for a data acquisition channel of a power system, and the method and the device have the following effects:
by monitoring the temperature of the CPU, the initial error of each sampling channel when the device is powered on is recorded, and each sampling channel is adaptively adjusted along with the change of the temperature, so that the protection and metering precision is improved, the frequent starting of a digital control protection system adopting a break variable starting element is avoided to a certain extent, and the false exit probability of the digital control protection system is reduced.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A self-adaptive adjustment method for a data acquisition channel of a power system is characterized by comprising the following steps:
acquiring an actual temperature detection value of the CPU;
acquiring sampling coefficients respectively corresponding to a plurality of data acquisition channels according to the actual temperature detection value;
and carrying out dynamic compensation of sampling errors on the data acquisition channel according to the sampling coefficient.
2. The adaptive adjustment method for the data acquisition channel of the power system according to claim 1, wherein before the acquiring the actual temperature detection value of the CPU, the adaptive adjustment method further comprises:
and carrying out error calibration on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relation of each data acquisition channel.
3. The adaptive adjustment method for the data acquisition channels of the power system as claimed in claim 2, wherein the error calibration is performed on the plurality of data acquisition channels by a standard test source to obtain the temperature-sampling coefficient corresponding relationship of each data acquisition channel, and the method specifically comprises the following steps:
applying a nominal current value or a nominal voltage value to each of the data acquisition channels based on the standard test source;
acquiring a plurality of cycle sampling data corresponding to a first preset temperature, and calculating the average value of the cycle sampling data to be used as a standard output waveform of a cycle;
adjusting the environment temperature to a second preset temperature value, acquiring the temperature recorded by the CPU and actual output values of a plurality of continuous cycles of each data acquisition channel, and calculating an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and calculating the sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is calculated.
4. The adaptive adjustment method for the data acquisition channel of the power system according to claim 3,
the range of the second preset temperature value is from the lowest temperature to the highest temperature which can be adapted by the data acquisition channel of the power system.
5. The adaptive adjustment method for the data acquisition channel of the power system according to claim 3,
the sampling coefficient is an average value of actual output/standard output in one cycle at the second preset temperature value.
6. The utility model provides a power system data acquisition channel self-adaptation adjusting device which characterized in that includes:
the temperature detection module is used for acquiring an actual temperature detection value of the CPU;
the data calculation module is used for acquiring sampling coefficients corresponding to a plurality of data acquisition channels according to the actual temperature detection value;
and the data compensation module is used for carrying out dynamic compensation on the sampling error of the data acquisition channel according to the sampling coefficient.
7. The adaptive adjusting device for the data acquisition channel of the power system according to claim 6, further comprising:
and the coefficient calculation module is used for carrying out error calibration on the plurality of data acquisition channels through a standard test source to obtain the temperature-sampling coefficient corresponding relation of each data acquisition channel.
8. The adaptive adjusting device for the data acquisition channel of the power system as claimed in claim 7, wherein the coefficient calculating module comprises:
a test unit for applying a nominal current value or a nominal voltage value to each of the data acquisition channels based on the standard test source;
the first calculating unit is used for acquiring a plurality of cycle sampling data corresponding to a first preset temperature, and calculating the average value of the cycle sampling data as a standard output waveform of one cycle;
the second calculation unit is used for adjusting the environment temperature to a second preset temperature value, acquiring the temperature recorded by the CPU and actual output values of a plurality of continuous cycles of each data acquisition channel, and calculating an average value in one cycle to obtain a corresponding output waveform of one cycle at the second preset temperature value;
and the third calculating unit is used for calculating the sampling coefficient corresponding to each data acquisition channel when the second preset temperature value is obtained.
9. The adaptive adjustment device for the data acquisition channel of the power system according to claim 8,
the range of the second preset temperature value is from the lowest temperature to the highest temperature which can be adapted by the data acquisition channel of the power system.
10. The adaptive adjustment device for the data acquisition channel of the power system according to claim 8,
the sampling coefficient is the average value of the actual output waveform/the standard output waveform in one cycle at the second preset temperature value.
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| CN115598579A (en) * | 2022-10-11 | 2023-01-13 | 辉羲智能科技（上海）有限公司（Cn） | Vehicle-mounted domain control voltage sampling system and error compensation method and system thereof |
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| CN115598579A (en) * | 2022-10-11 | 2023-01-13 | 辉羲智能科技（上海）有限公司（Cn） | Vehicle-mounted domain control voltage sampling system and error compensation method and system thereof |
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