CN108919168B - Method for improving distortion degree of high-voltage power source based on digital compensation technology - Google Patents
Method for improving distortion degree of high-voltage power source based on digital compensation technology Download PDFInfo
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Abstract
The invention discloses a method for improving the distortion degree of a high-voltage power source based on a digital compensation technology. The method adopts a digital compensation technology to improve the waveform distortion degree of the output signal of the power source of the high-voltage electric energy metering device. The method is implemented on the basis of a meter source integrated high-voltage electric energy metering device, utilizes the modern digital synthesis and high-speed digital sampling technology, corrects the output waveform of a power source in a point-by-point compensation mode, and greatly improves the distortion index of a waveform signal output by the high-voltage electric energy metering device, so that the distortion of a sinusoidal signal of a power source output loop caused by non-linear loads such as a booster, a current booster, a high-voltage electric energy meter and the like is counteracted, and the uncertainty error value introduced in the verification process of the high-voltage electric energy meter caused by the large distortion of a signal provided by power is reduced. By adopting the digital compensation technology, the signal waveform distortion degree of the high-voltage electric energy metering device is better than 0.3% in the rated power output state.
Description
Technical Field
The invention relates to the field of high-voltage electric energy meter metering and verification, in particular to a method for improving the distortion degree of a high-voltage power source based on a digital compensation technology.
Background
In recent years, with the gradual expansion of the application range of high-voltage electric energy meters, the workload of verification is increasing, and a metrological verification mode with one source and multiple meters needs to be adopted and an optimal cost performance scheme is adopted to meet the increase of verification demand.
At present, a virtual power method is adopted for the verification of the high-voltage electric energy meter, and two modes of a metering device power supply source are adopted: firstly, the method of self-coupling boosting after the commercial power is filtered to a certain degree is adopted to provide virtual power for the high-voltage electric energy meter, and secondly, the method of program control power source is adopted. No matter which mode is adopted, large voltage loop feedback cannot be realized, so that the distortion degree of voltage signals obtained by the high-voltage electric energy meter is generally large. The detection data of the actual production process of different high-voltage electric energy meter production enterprises are known as follows: when the metering device is used for hanging a high-voltage electric energy meter for verification, the waveform distortion degree of a power source output signal is about 0.5%; when two high-voltage electric energy meters are hung, the waveform distortion degree of the output signal of the power source is about 0.96 percent; when three high-voltage electric energy meters are hung, the waveform distortion degree of the output signal of the power source is about 1.44%; when four high-voltage electric energy meters are hung, the waveform distortion degree of the output signal of the power source is about 1.92 percent. The distortion index becomes worse linearly with the increase of the load, although the load still does not reach the full load value of the output power of the metering device, in the actual test, four electric energy meters are used as the load access of the voltage, and the distortion index of the voltage output signal is close to the maximum distortion index specified by the national standard. Because the existing error judgment method for the high-voltage electric energy meter adopts the standard meter to test the high-voltage electric energy meter, the magnitude of the accumulated electric energy of the standard meter and the high-voltage electric energy meter is influenced by the distortion index of the voltage signal, and thus measurement errors are introduced.
The magnitude of how to reduce the signal distortion in a one-source multi-table operating mode has plagued manufacturers of metrology devices. Due to the existence of non-resistive devices such as a high-voltage booster, a high-voltage PT and the like in a signal processing system of a traditional high-voltage electric energy meter metering device, the cut-off frequency of the signal processing system of the high-voltage electric energy meter metering device is only 400 Hz-700 Hz, and the cut-off frequency is only 10 octave distance away from a 50Hz power frequency signal, so that the open-loop gain of the signal processing system cannot be improved by adopting a traditional analog PID circuit, the steady-state error of the system cannot be reduced, and the distortion index of a voltage signal cannot be improved.
Disclosure of Invention
Aiming at the defects of the traditional signal processing system of the high-voltage electric energy meter metering device, the invention provides a method for improving the waveform distortion degree of the output signal of the power source of the high-voltage electric energy meter metering device based on a digital compensation technology. The method is based on a digital compensation circuit formed by a high-speed sampling AD, a high-speed operation DSP chip and a high-performance AI core board, adopts a high-speed high-precision sampling technology to collect output signals, adopts a digital compensation algorithm to carry out digital compensation operation on the digital sampling signals, compensates point-by-point signals and regenerates a power output signal waveform, and compensates loop nonlinear distortion in a digital mode, so that the distortion degree of the power source output signal waveform of the high-voltage electric energy metering device is improved.
The invention is realized by the following technical scheme:
the method for improving the distortion degree of the high-voltage power source based on the digital compensation technology is characterized by comprising the following steps of:
step one, a meter source integrated program control power source type high-voltage electric energy meter metering verification circuit and a high-speed high-precision digital compensation circuit are built; the meter-source integrated program-controlled power source type high-voltage electric energy meter metering verification circuit comprises a meter-source integrated program-controlled power source, a booster, a high-voltage electric energy meter and a high-precision high-voltage PT, wherein the meter-source integrated program-controlled power source, the booster, the high-voltage electric energy meter and the high-precision high-voltage PT are sequentially connected, and the high-speed high-precision digital compensation circuit comprises a high-speed sampling AD, a high-speed operation DSP and a high-performance AI core board which are sequentially connected; the high-speed sampling AD is connected with a high-precision high-voltage PT, and the high-performance AI core board is connected with the digital synthesis high-precision signal source;
step two, the high-speed sampling AD is used for carrying out digital sampling on the output signal of the high-precision high-voltage PT, and the sampling rate reaches more than 10 MHz;
performing digital compensation operation on the signals subjected to digital sampling through a high-speed operation DSP, performing point-by-point signal compensation and regenerating success rate output signal waveforms;
and step four, sending the signal waveform to a digital synthesis high-precision signal source through a high-performance AI core board so as to compensate the nonlinear distortion of the loop.
In order to reduce interference during data processing and improve reliability of data processing, further, in the third step, filtering and denoising processing needs to be performed on the digitally sampled signal before performing digital compensation operation.
Specifically, in the third step, a digital compensation operation is performed on the digitally sampled signal by using a position-based digital PID compensation algorithm, and the operation formula is as follows:
in the formula: e (j) is the input quantity of the digital PID compensation algorithm, and respectively represents the deviation value between the preset value and the actual output value at the jth moment; u (k) is the output quantity of the digital PID compensation algorithm, and represents the value after digital compensation at the kth moment; u (0) is a preset value; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
Furthermore, a position type digital PID compensation algorithm is adopted for periodic compensation, in order to ensure the integrity of the output signal waveform, the output value u (k) after each sampling operation is temporarily stored in a memory in an array mode, and after the sampling of the whole period is completed, the operation result is updated and output in the form of the signal waveform of the whole period at the beginning of the next period of the signal waveform.
Further, the location-based digital PID compensation algorithm needs to establish a buffer array of e (k) difference values and u (k) output values according to the number of periodic sampling points, if multi-point averaging filtering processing is needed, the demand on the memory is large, and in the third step, in a system with limited memory capacity and large operation speed margin, an incremental digital PID compensation algorithm can be used for performing digital compensation operation on the digitally sampled signals, and the operation formula is as follows:
u(k)＝u(k)-u(k-1)＝Kp(e(k)-e(k-1))+Kie(k)+Kd[e(k)-2e(k-1)+e(k-2)](3)
in the formula: e (k), e (k-1) and e (k-2) are used as input quantities of the digital PID compensation algorithm and respectively represent deviation values between preset values and actual output values at the kth moment, the kth-1 moment and the kth-2 moment; u (k) is the output quantity of the digital PID compensation algorithm, and represents the value after digital compensation at the kth moment; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
Furthermore, an incremental digital PID compensation algorithm is adopted for real-time compensation, and in the output process of a signal waveform point, the digital compensation circuit carries out AD digital sampling three times in real time, calculates compensation quantity and corrects an output value in real time.
Specifically, the digital synthesis high-precision signal source is used for generating a signal source function signal waveform, and can generate a sinusoidal function signal with a cycle signal waveform 3600 points or more; the program-controlled power source is used for analog PID adjustment and signal power amplification of the circuit; the booster boosts the secondary voltage of the power amplification signal and reserves an original feedback loop of a primary stage of the booster to compress and reduce an error function; the high-voltage electric energy meter is a verification object and is a load of the system; the high-precision high-voltage PT is an accurate sampling component of a load voltage signal.
Specifically, the high-performance AI core implements data collection and algorithm deep learning operation for outputting control signals to a digital synthesis high-precision signal source; the high-speed operation DSP realizes the operations of filtering, noise reduction and compensation of the digitally sampled signals; the high-speed sampling AD is used for carrying out digital sampling on the output signal with high precision and high voltage.
The invention has the following advantages and beneficial effects:
1. the invention fully considers the characteristics of a signal processing system of a metering device of the high-voltage electric energy meter, corrects the output waveform of the power source in a point-by-point compensation mode under the condition of not considering the uncertain influence degree caused by load characteristic curves such as a booster, a high-voltage PT (potential transformer), the high-voltage electric energy meter and the like, so that the distortion index of the waveform signal output by the high-voltage electric energy metering device is greatly improved, the distortion of a sinusoidal signal of a power source output loop caused by nonlinear loads such as a booster, a current booster, the high-voltage electric energy meter and the like is counteracted, and the introduction of an uncertainty error value in the verification process of the high-voltage electric energy meter caused by the large signal. By adopting the digital compensation technology, the signal waveform distortion degree of the high-voltage electric energy metering device is better than 0.3% in the rated power output state.
2. The invention adopts the surface source integrated program control power source, ensures that DA and AD in the system work under the same clock condition and use the same signal waveform function; meanwhile, a signal source with more than 3600 points per cycle can be generated, the practical requirements of the metrological verification device are completely met, and the distortion of the signal source function waveform can be accurately compensated in a point-by-point mode.
3. The invention can also be applied to improve the distortion degree of the waveform signal output by the low-voltage electric energy meter calibrating device, thereby further improving the electrical performance index of the low-voltage electric energy meter calibrating device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic block diagram of a digital compensation system of the present invention.
FIG. 2 is a comparison graph of waveforms generated by the signal source; a-the traditional signal source generates waveforms, and b-the digital synthesis high-precision signal source generates waveform diagrams.
Fig. 3 is a block diagram of the digital compensation signal control of the present invention.
FIG. 4 is a schematic diagram of the position-based digital PID compensation of the present invention.
Fig. 5 is a schematic diagram of the incremental digital PID compensation of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The method for improving the waveform distortion degree of the output signal of the power source of the high-voltage electric energy metering device based on the digital compensation technology comprises the following steps:
firstly, a digital compensation system is built, as shown in fig. 1, the digital compensation system comprises a digital synthesis high-precision signal source, a program-controlled power source, a booster, a high-voltage electric energy meter, a high-precision high-voltage PT, a high-speed sampling AD, a high-speed operation DSP and a high-performance AI core board which are sequentially connected into a loop, and the high-performance AI core board outputs a control signal to be fed back to the digital synthesis high-precision signal source.
The invention adopts a programmable power source integrated with a meter source (comprising an integrated digital synthesis high-precision signal source and a programmable power source with high stability), and the meter source is integrated to ensure that the DA and the AD work under the condition of a unified clock and know the waveform function (namely a waveform table) of a signal sent by the signal source, so that the DA and the AD can be compared with sampling waveform data point by point to obtain an error function table; the reason why the digital synthesis high-precision signal source is used as a meter source is to provide a sufficiently high-precision signal source (the signal source needs to have a minimum number of 3600 points per cycle) or to control the waveform function of the signal source. In addition, the low-voltage part closed loop of the high-precision stable source still keeps an original higher gain feedback loop so as to ensure that a comparison function of setting and output is in convergence and has a smaller magnitude.
The program-controlled power source is used for analog PID regulation and signal power amplification of a circuit, the booster lifts secondary voltage of a power amplification signal and reserves an original primary feedback loop of the booster to compress and reduce an error function; the high-voltage electric energy meter is a verification object and the load of the system; the high-precision high-voltage PT is an accurate sampling component of a load voltage signal.
The DA amplitude point number of the traditional digital synthesis signal source is generally about 360-400 points per period signal, which is equal to that the correction influence quantity of each point reaches 0.25% (one fourth of one percent), so that the digital compensation signal can not accurately compensate the signal source function waveform, and the practical requirement of a 0.05-level metrological verification device can not be met. The invention adopts a digital synthesis high-precision signal source, the amplitude point number of a digital synthesis signal source DA is increased to 4000 points and even 40000 points per cycle, which is equal to that the correction influence quantity of each point reaches 0.025 percent (one per thousand) to 0.0025 percent, completely meets the practical requirement of a 0.05-level metrological verification device, and can accurately compensate the distortion of the signal source function waveform in a point-by-point mode, as shown in figure 2, a is the traditional signal source DA amplitude point number, and b is the digital synthesis high-precision signal source DA amplitude point number of the invention.
In the experimental process, a system consisting of a plurality of different boosters and a high-voltage sampling PT is tested, the open-loop cut-off frequency is distributed between 400Hz and 700Hz, the distance from a 50Hz power frequency signal is about 10 octaves, the Ga 20log10 dB is calculated by a theoretical calculation formula of the open-loop gain Ga of the serial correction analog circuit, the obtained theoretical open-loop gain value is far away from the ideal value of the open-loop gain of the system by 40dB, and in order to ensure the closed-loop stability of the system, the amplitude-frequency margin needs to be reduced by 6dB, so the open-loop gain Ga of the analog circuit of the system can only be below 14 dB. Because the analog circuit systems are all differential negative feedback systems, the steady-state error of the system is in inverse proportion to the open-loop gain, the higher the open-loop gain is, the smaller the steady-state error is, and the smaller the open-loop gain is, the steady-state error is correspondingly increased, so that the distortion index of the voltage signal is deteriorated.
The high-precision high-voltage PT is required to reach the requirement of more than 0.01 grade, the PT is a reference standard of digital compensation quantity, the parameter accuracy of the component directly influences the index characteristic of a system, and the accuracy of the digital compensation quantity can be guaranteed on the premise that the distortion of a digital synthesis waveform circuit can be corrected by a set and sampled error comparison function.
The high-performance AI core is responsible for data collection and algorithm deep learning operation and finally implements control signal output, a mainstream neural network framework is required, AI operation and artificial intelligence stack are provided, neural network computing hardware acceleration is required, and scheme cost is also considered. The sampling rate of the high-speed sampling AD chip is higher than that of the PT feedback signal digital sampling AD chip and needs to be more than 10 MHz. After the digital signal is sampled, filtering and denoising are needed, and then high-speed real-time signal operation processing can be carried out, so that a DSP chip with high-speed operation capability is needed to timely meet the requirement of multi-path concurrent operation.
The digital compensation is realized point by running a digital compensation algorithm in a digital compensation circuit, and a digital compensation control signal block diagram of the invention is shown in figure 3.
In order to realize digital compensation control, firstly, discrete processing is carried out on the value of the acquired digital signal, and the embodiment adopts a position type digital PID compensation algorithm for processing. The operation formula is as follows:
in the formula: e (j) is the input quantity of the digital PID compensation algorithm, and respectively represents the deviation value (j is 0 … k) between the preset value and the actual output value at the j-th moment; u (k) is the output quantity of the digital PID compensation algorithm, and represents the value after digital compensation at the kth moment; u (0) is a preset value; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
Obviously, the adoption of the position type digital compensation algorithm is suitable for periodic compensation, because each waveform signal is output by a full value, in order to ensure the integrity of the waveform of the output signal, the output value u (k) after each sampling operation is temporarily stored in a memory in an array mode; when 4000 points are completely sampled, the operation result is updated and output in a whole-period signal waveform mode at the beginning of the next period. The principle of the position-based point-by-point digital compensation is shown in fig. 4.
Example 2
The position-based digital compensation algorithm adopted in embodiment 1 needs to establish a buffer array of e (k) difference values and u (k) output values according to the number of sampling points in a period, and if multi-point averaging filtering processing is needed, the capacity requirement on a memory is relatively large. Therefore, in this example 2, an incremental digital PID compensation algorithm is adopted for a system with a small memory capacity and a large computation speed margin, and the computation formula is given by setting k in equation 1 to k-1 as follows:
subtracting the formula 2 from the formula 1 to obtain an incremental digital PID compensation operation formula as follows:
u(k)＝u(k)-u(k-1)＝Kp(e(k)-e(k-1))+Kie(k)+Kd[e(k)-2e(k-1)+e(k-2)](3)
in the formula: e (k), e (k-1) and e (k-2) are used as input quantities of the digital PID compensation algorithm and respectively represent deviation values between preset values and actual output values at the kth moment, the kth-1 moment and the kth-2 moment; u (k) is a numberThe output quantity of the word PID compensation algorithm represents the value after digital compensation at the kth moment; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
It can be seen from equation 3 that the incremental digital compensation algorithm does not need to accumulate, and is only related to the latest error sampling values, so that the dependence of the digital compensation system on the memory is greatly reduced, and on the other hand, the incremental digital compensation algorithm obtains the compensation increment, so that the influence of the over-compensation amount is small, and the compensation disturbance is small.
The incremental point-by-point digital compensation principle is shown in fig. 5, and after the incremental digital compensation algorithm is adopted, in the output process of one signal waveform point, the system carries out three times of AD digital sampling and compensation quantity calculation in real time, and corrects an output value in real time. Compared with a position type digital compensation algorithm which needs a periodic sampling compensation mode, the method has higher instantaneity and effectiveness on system output compensation.
The method for improving the waveform distortion degree of the output signal of the power source of the high-voltage electric energy metering device by adopting the point-by-point digital compensation technology can improve the distortion degree index by more than 10 times under the same load condition. The improvement of the distortion index enables the existing high-voltage electric energy metering device to provide more accurate and more effective power source signals for the high-voltage electric energy meter, and provides effective guarantee for the accuracy of the high-voltage electric energy meter accurately metered by a metering unit. The method can also be widely applied to the field of power source loop control of low-voltage electric energy meter calibrating devices.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The method for improving the distortion degree of the high-voltage power source based on the digital compensation technology is characterized by comprising the following steps of:
step one, a meter source integrated program control power source type high-voltage electric energy meter metering verification circuit and a high-speed high-precision digital compensation circuit are built; the meter-source integrated program-controlled power source type high-voltage electric energy meter metering verification circuit comprises a meter-source integrated program-controlled power source, a booster, a high-voltage electric energy meter and a high-precision high-voltage PT, wherein the meter-source integrated program-controlled power source, the booster, the high-voltage electric energy meter and the high-precision high-voltage PT are sequentially connected, and the high-speed high-precision digital compensation circuit comprises a high-speed sampling AD, a high-speed operation DSP and a high-performance AI core board which are sequentially connected; the high-speed sampling AD is connected with a high-precision high-voltage PT, and the high-performance AI core board is connected with the digital synthesis high-precision signal source;
step two, the high-speed sampling AD is used for carrying out digital sampling on the output signal of the high-precision high-voltage PT, and the sampling rate reaches more than 10 MHz;
performing digital compensation operation on the signals subjected to digital sampling through a high-speed operation DSP, performing point-by-point signal compensation and regenerating success rate output signal waveforms;
and step four, sending the signal waveform to a digital synthesis high-precision signal source through a high-performance AI core board so as to compensate the nonlinear distortion of the loop.
2. The method according to claim 1, wherein in step three, the digitally sampled signal is further filtered and denoised before the digital compensation operation.
3. The method for improving the distortion factor of the high-voltage power source based on the digital compensation technology of claim 1, wherein in the third step, a digital PID compensation algorithm is used to perform digital compensation operation on the digitally sampled signal, and the operation formula is as follows:
in the formula: e (j) is a digital PID complementThe compensation algorithm input quantity respectively represents a deviation value between a preset value and an actual output value at the jth moment; e (k) and e (k-1) are used as input quantities of the digital PID compensation algorithm and respectively represent deviation values between preset values and actual output values at the kth moment and the kth-1 moment; u (k) is the output quantity of the digital PID compensation algorithm, and represents the value after digital compensation at the kth moment; u (0) is a preset value; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
4. The method for improving the distortion factor of high voltage power source based on digital compensation technique as claimed in claim 3,
and in order to ensure the integrity of the output signal waveform, the output value u (k) after each sampling operation is temporarily stored in an internal memory in an array mode, and after the sampling of the whole period is finished, the operation result is updated and output in the form of the signal waveform of the whole period from the next period of the signal waveform.
5. The method for improving the distortion factor of the high voltage power source based on the digital compensation technology of claim 1, wherein in the third step, an incremental digital PID compensation algorithm is used to perform digital compensation operation on the digitally sampled signal, and the operation formula is as follows:
u(k)＝u(k)-u(k-1)＝Kp(e(k)-e(k-1))+Kie(k)+Kd[e(k)-2e(k-1)+e(k-2)](3)
in the formula: e (k), e (k-1) and e (k-2) are used as input quantities of the digital PID compensation algorithm and respectively represent deviation values between preset values and actual output values at the kth moment, the kth-1 moment and the kth-2 moment; u (k) is the output quantity of the digital PID compensation algorithm, and represents the value after digital compensation at the kth moment; u (k-1) is the output quantity of the digital PID compensation algorithm and represents the value after digital compensation at the k-1 moment; kpIs a proportionality coefficient; kiIs an integral coefficient; kdIs a differential coefficient.
6. The method for improving the distortion factor of a high voltage power source based on the digital compensation technique as claimed in claim 5, wherein an incremental digital PID compensation algorithm is used for real-time compensation, and during the output of one signal waveform point, the digital compensation circuit performs three AD digital samplings in real time, calculates the compensation amount, and corrects the output value in real time.
7. The method for improving the distortion degree of the high-voltage power source based on the digital compensation technology according to claim 1, wherein the digital synthesis high-precision signal source is used for generating a signal source function signal waveform, and can generate a sine function signal with 4000-40000 points per cycle of the signal waveform; the program-controlled power source is used for analog PID adjustment and signal power amplification of the circuit; the booster boosts the secondary voltage of the power amplification signal and reserves an original feedback loop of a primary stage of the booster to compress and reduce an error function; the high-voltage electric energy meter is a verification object and is a load of the system; the high-precision high-voltage PT is an accurate sampling component of a load voltage signal.
8. The method for improving the distortion factor of the high-voltage power source based on the digital compensation technology as claimed in claim 1, wherein the high-performance AI core realizes data collection and algorithm deep learning operation for outputting the control signal to the digital synthesis high-precision signal source; the high-speed operation DSP realizes the operations of filtering, noise reduction and compensation of the digitally sampled signals; the high-speed sampling AD is used for carrying out digital sampling on the output signal with high precision and high voltage.
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| CN107425863A (en) * | 2016-05-23 | 2017-12-01 | 株式会社Kmw | Sample availability method of discrimination and device for digital predistortion apparatus |
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