CN115701005B - Z-plane zero pole design-based platform region identification method - Google Patents
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Abstract
The invention provides a Z-plane pole-zero design-based station area identification method, which comprises the following steps of: step 1, equipment to be identified in a power grid, namely transmitting equipment transmits characteristic current containing specific codes into the power grid; step 2, the receiving equipment in the power grid reduces the current and samples the current signal to obtain a sampling result; step 3, extracting and demodulating the characteristic current of the sampling result to obtain demodulation information; step 4, comparing the demodulation information with expected data, completing the identification of the station areas, and establishing a station area relation; the invention reduces the calculation complexity and the recognition success rate of the characteristic current extraction. Not only can the performance be improved, but also the equipment cost can be reduced; the operation formula is simplified, and the hardware cost and the complexity of a system scheme are reduced; the interference of large signals of 50Hz and the harmonic waves of the power frequency is greatly eliminated, and the performance is improved.
Description
Technical Field
The invention relates to a station area identification method, in particular to a station area identification method based on Z-plane zero pole design.
Background
The transformer is used for transmitting power to a power supply area on the side of the user ammeter, a large number of electric equipment is connected in the transformer area, the equipment is arranged in each place in the transformer area, wiring is complex, and upstream and downstream relations are unknown. The circuit connection network topology relation of the devices provides a crucial basis for management and service of the power transportation and management department, and provides a quick positioning function for the problem investigation of circuit fault point positions, line losses and the like.
Therefore, how to provide a signal modulation and demodulation method for identifying topological relation of low-voltage area to determine the upstream and downstream relation of electrical devices in the area is a problem that needs to be solved by those skilled in the art.
The indoor meter emits a characteristic current signal with specific frequency and is overlapped in the original power frequency current signal of the indoor meter for transmission,
The receiving module is arranged at the position of the circuit breaker of the meter box and is used for receiving the power frequency current signal transmitted to the meter box by the household meter and extracting the characteristic current signal in the power frequency current signal;
The large number of electrical equipment in the transformer area can generate various interferences to the power line, so that the recognition success rate of the characteristic current can be influenced.
Because of the characteristic current extraction, digital signal processing is required, and the operand is large. However, the terminal equipment has low price and high requirement on cost control, so that the calculation complexity is reduced as much as possible on the basis of ensuring the success rate of recognition.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the invention provides a station area identification method based on Z-plane pole-zero design.
In order to solve the technical problems, the invention discloses a station area identification method based on Z-plane pole-zero design, which comprises the following steps:
Step 1, equipment to be identified in a power grid, namely transmitting equipment transmits characteristic current containing specific codes into the power grid;
Step 2, the receiving equipment in the power grid reduces the current and samples the current signal to obtain a sampling result;
Step 3, extracting and demodulating the characteristic current of the sampling result to obtain demodulation information;
The method for extracting and demodulating the characteristic current in the step 3 comprises the following steps:
Step 3-1, designing a filter according to the Z-plane characteristic, wherein the method comprises the following steps:
step 3-1-1, setting poles and zeros according to frequency points of the characteristic current; the method specifically comprises the following steps:
Setting a pole:
in the Z plane, two frequency points corresponding to the characteristic current are respectively provided with a pole;
Setting a zero point:
Every other in the Z plane Setting n zero points; wherein, n meets the points on the Z plane unit circle corresponding to the power frequency 50Hz and 50Hz harmonic wave, and falls into the n zero points.
Step 3-1-2, calculating to obtain a transfer function of the Z plane, which specifically comprises the following steps:
according to the zero point set in the step 3-1-1, the corresponding polynomial is as follows:
according to the poles set in the step 3-1-1, the corresponding polynomials are as follows:
1-e2*π*f/fsZ-1
the transfer function of the Z-plane is:
Wherein n is the maximum order of zero; f is a preset frequency, namely a frequency point corresponding to the characteristic current, and fs is a sampling rate of current data acquisition.
Fs=6400 hz is set, n=3456.
F= 783.333Hz or 883.333Hz is set.
And 3-2, extracting the characteristic current by using the filter, and demodulating, wherein the specific method comprises the following steps:
according to the inverse Z transformation principle of the Z plane transfer function H (Z), calculating to obtain data H (m) after m-moment processing:
h(m)＝x(m)-x(m-t)+e2*π*f/fs*h(m-1)
Wherein x (m) represents sampling data at m time; x (m-t) represents the sampled data at m-t.
The demodulation method comprises the following steps: according to h (m), demodulated information after demodulation is obtained, and the specific method is as follows:
Integrating the absolute value of the processed data h (m) within 0.6s, and judging according to the integral size to obtain a binary value of 0 or 1; finally, whether the characteristic current is received is determined by judging whether the specific code is received.
The specific code is 0 xAAE.
And step 4, comparing the demodulation information with expected data, completing the identification of the station areas, and establishing a station area relation.
The beneficial effects are that:
and the computational complexity and the recognition success rate of the characteristic current extraction are reduced. Not only can the performance be improved, but also the equipment cost can be reduced.
The operation formula is simplified, and the hardware cost and the complexity of the system scheme are reduced.
The interference of large signals of 50Hz and the harmonic waves of the power frequency is greatly eliminated, and the performance is improved.
Drawings
The foregoing and/or other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings and detailed description.
FIG. 1 is a schematic of the workflow of the present invention.
FIG. 2 is a pole position schematic.
Fig. 3 is a schematic diagram of amplitude response characteristics.
Fig. 4 is a process data flow diagram.
FIG. 5 is a schematic diagram of a characteristic current code bit.
Fig. 6 is a schematic diagram of a characteristic current waveform.
Fig. 7 is a schematic diagram of an absolute value waveform after the characteristic current processing.
Fig. 8 is a frequency domain data schematic of fs=6400 Hz acquired raw data.
Fig. 9 is a schematic diagram of frequency domain data after processing at f= 783.333 Hz.
Detailed Description
As shown in fig. 1, a method for identifying a region based on Z-plane pole-zero design includes the following steps:
Step 1, equipment to be identified in a power grid, namely transmitting equipment transmits characteristic current containing specific codes into the power grid;
Step 2, the receiving equipment in the power grid reduces the current and samples the current signal to obtain a sampling result;
Step 3, extracting and demodulating the characteristic current of the sampling result to obtain demodulation information;
The method for extracting and demodulating the characteristic current in the step 3 comprises the following steps:
Step 3-1, designing a filter according to the Z-plane characteristic, wherein the method comprises the following steps:
step 3-1-1, setting poles and zeros according to frequency points of the characteristic current; the method specifically comprises the following steps:
Setting a pole:
in the Z plane, two frequency points corresponding to the characteristic current are respectively provided with a pole;
Setting a zero point:
Every other in the Z plane Setting n zero points; wherein, n meets the points on the Z plane unit circle corresponding to the power frequency 50Hz and 50Hz harmonic wave, and falls into the n zero points.
Step 3-1-2, calculating to obtain a transfer function of the Z plane, which specifically comprises the following steps:
according to the zero point set in the step 3-1-1, the corresponding polynomial is as follows:
according to the poles set in the step 3-1-1, the corresponding polynomials are as follows:
1-e2*π*f/fsZ-1
the transfer function of the Z-plane is:
Wherein n is the maximum order of zero; f is a preset frequency, namely a frequency point corresponding to the characteristic current, and fs is a sampling rate of current data acquisition.
Fs=6400 hz is set, n=3456.
F= 783.333Hz or 883.333Hz is set.
And 3-2, extracting the characteristic current by using the filter, and demodulating, wherein the specific method comprises the following steps:
according to the inverse Z transformation principle of the Z plane transfer function H (Z), calculating to obtain data H (m) after m-moment processing:
h(m)＝x(m)-x(m-t)+e2*π*f/fs*h(m-1)
Wherein x (m) represents sampling data at m time; x (m-t) represents the sampled data at m-t.
The demodulation method comprises the following steps: according to h (m), demodulated information after demodulation is obtained, and the specific method is as follows:
Integrating the absolute value of the processed data h (m) within 0.6s, and judging according to the integral size to obtain a binary value of 0 or 1; finally, whether the characteristic current is received is determined by judging whether the specific code is received.
The specific code is 0 xAAE.
And step 4, comparing the demodulation information with expected data, completing the identification of the station areas, and establishing a station area relation.
Examples:
The identification of the topological relation of the transformer area is used for judging the phase attribution, the line attribution and the transformer attribution of the user ammeter.
The identification of the topological relation of the platform area is to transmit characteristic current through the equipment nodes, and the main node of the platform area identifies how many equipment nodes exist under the platform area through identifying the characteristic current.
And (3) signal transmission:
the on-off mode of the switch can generate a current signal which deviates around the switching frequency by plus or minus 50Hz on the circuit, the switch is on-off at the frequency of 5000/6= 833.3Hz (1.2 ms is a period, 400us is turned on and 800us is turned off), the peak value of the transmitted current signal is 420mA (220V voltage), and current signals with the frequencies of 783.3Hz and 883.3Hz are generated on the circuit. The presence or absence of these two-point signals is detected to identify them.
Specifically, 16-bit binary coding: 101 010 1011 101 00 1. Wherein, when the code bit is 0, no characteristic current is sent, and when the code bit is 1, the characteristic current is sent. Fig. 5 and 6 are corresponding schematic diagrams. Fig. 5 is a schematic diagram of a characteristic current code bit, and fig. 6 is a schematic diagram of a characteristic current waveform.
The single transmission time is 9.6s, i.e. the transmission time length per bit code is 0.6s. The overall time deviation of single transmission is +/-40 ms, and each bit of code allows the time deviation of transmission to be +/-15 ms.
And (3) signal identification:
At the receiving end, AD conversion is carried out on the current sampling signal, the current signal on the line is extracted in real time by adopting the identification method designed by the invention, 783Hz and 883Hz frequency domain component amplitude values are calculated, and the sum of the 783Hz and 883Hz frequency domain component amplitude values is used as a judgment standard for decoding
As shown in fig. 7, which is an absolute value waveform diagram after the current signal processing, 1010 1010 1110 1001, that is, 0xAAE, can be clearly seen, when a certain node is started to emit the characteristic current, only all source nodes with power supply relation can receive the characteristic signal. Thereby realizing branch recognition.
The invention relates to a method for designing characteristic current signal extraction through pole and zero point planning of a Z plane, which comprises the following steps:
The receiving device will let a certain device start transmitting the characteristic current through the carrier channel. The characteristic current of this device will emit a modulated signal at a fixed frequency point. The object of the invention is to demodulate this signal and to compare the demodulated result data with the expected data (by default 0xAAE, also the receiving device can issue via carrier communication to the device that needs to send the characteristic current). If the demodulated data and the expected data are all the time, the received characteristic current is indicated, the device can be identified as being in the station area of the receiving device, and the station area relation can be established.
The frequency point of the characteristic current emission after OOK modulation is 833.333Hz (prescribed by China Association of instruments and meters, technical Specification for identifying topological relation of a platform area based on characteristic current), and the characteristic current signals of 783.333Hz and 883.333Hz can appear at a receiving device end after 50Hz frequency mixing on a power line. The object is to obtain signals of the two frequency points through filtering, and then demodulate the OOK modulated information to obtain information content of characteristic current transmission.
Because various interferences on the power line are very strong, especially the power frequency interference of 50Hz is very strong, and the harmonic interference of 50Hz is also very strong. In addition, the characteristic current emission end is affected by aspects of heat dissipation, power consumption, volume and the like, and the characteristic current emission cannot be very large. And the large ammeter is hung below the receiving equipment, so that the total current can be large, the current collector at the receiving equipment end can collect the current only after the current is reduced by 8000 times or more, and otherwise, the collecting equipment overflows. The characteristic current acquired in this case is much smaller than the interference signal.
In this case, a filter with a narrow transition band and a large stop band rejection is required to filter out the two frequency point signals corresponding to the characteristic current. The order of the filter is long, and a relatively large amount of calculation force is needed to complete the calculation.
Zero points near the unit circle of the Z plane can generate trap at the corresponding frequency of the amplitude-frequency characteristic of the filter, and the closer the zero points are to the unit circle, the deeper the trap is; and poles near the unit circle of the Z plane can generate convex peaks at the corresponding frequency of the amplitude-frequency characteristic of the filter, and the closer the poles are to the unit circle, the higher the convex peaks are.
The design method of the invention is to intuitively design a filter according to the characteristic of the Z plane. Two poles are respectively placed at two frequency points corresponding to the characteristic current, and zero points are placed at two sides of the working frequency point of the characteristic current as close as possible, so that the transition zone of the filter is as narrow as possible, and some zero points are placed at the working frequency point of the principle characteristic current. Particularly, zero points are respectively arranged at the corresponding harmonic positions of 50Hz and 50Hz so as to eliminate interference caused by the power frequency of 50Hz and the harmonic of 50 Hz. According to the thought, a pole diagram is drawn on a Z-plane, as shown in fig. 2, the pole corresponding to 783.333Hz is a point corresponding to a Z-plane unit circle corresponding to 2 pi 783.333/fs radian; as shown in fig. 3, the pole corresponding to 883.333Hz is a point corresponding to a Z-plane unit circle corresponding to 2x pi 883.333/fs radian. fs is the sampling rate and 6400Hz can be taken (the value reason is mentioned later).
To simplify the calculation, the invention is used for every other Z planeIn order to eliminate the strong interference of the power frequency 50Hz and 50Hz harmonic waves, n points on the Z plane unit circle corresponding to the power frequency 50Hz and 50Hz harmonic waves are required to be met, and the points fall into the n zero points.
From the zero and pole positions of the Z plane mentioned above, the overall function can be obtained as follows:
The polynomial corresponding to zero is:
The polynomial corresponding to the pole is: 1-e 2*π*f/fsZ-1
The transfer function of the Z plane is then:
Where f= 783.333Hz or 883.333Hz, fs is the sampling rate of the current data acquisition. In order to eliminate strong interference at 50Hz at power frequencies, the points on the Z plane unit circle corresponding to the harmonics at 50Hz and 50Hz at power frequencies, i.e. H (e 2*π*50*k/fs), k=1, 2,3,5. According to the nyquist sampling theorem, fs >2f. From these 2 conditions, a number of sets of values of fs and n satisfying the conditions can be obtained. Where s=6400 hz, n=3456 is one of the groups.
The amplitude response characteristics of the filter are obtained:
according to the inverse Z transformation principle of the Z plane transfer function H (Z), H (m) is obtained:
H (Z) -inverse Z transformation principle to obtain H (m) =x (m) -x (m-n) +e 2*π*f/fs H (m-1)
X (m) represents the sampled data at m time instants. x (m-n) represents sampling data at m-n time instants. h (m) represents the data processed at the m time. h (m-1) represents the data processed at time m-1. ( And integrating the absolute value of the processed h (m) (figure 7) data in the time of 0.6s, and judging according to the integral size to obtain a binary value of 0 or 1. Finally, whether the characteristic current is received or not is determined by judging whether 0xAAE is received or not. )
From h (m), a data flow diagram can be drawn, as shown in FIG. 4. The output value at m time of h (m) is: the input value x (m) at time m is subtracted from the input value x (m-n) at time m-n, and then the value h (m-1) at the time m of h (m) is added to multiply the coefficient e 2*π*f/fs.
F= 783.333 at 783.333Hz current characteristics are identified according to formula h (m), this time
e2*π*f/fs＝0.7185816+0.6954426*1i
h(m)＝x(m)-x(m-n)+(0.7185816+0.6954426*1i)*h(m-1)
F= 883.333 when identifying the current characteristics of 883.333Hz, this time
e2*π*f/fs＝0.6469561+0.7625272*1i
h(m)＝x(m)-x(m-n)+(0.6469561+0.7625272*1i)*h(m-1)
Only one complex multiplier and 2 complex adders and subtractors are needed to process one sample point. The operation is greatly simplified, and the hardware cost is reduced.
Because the zero points are arranged at the harmonic positions of the power frequency 50Hz and the power frequency 50Hz, the large signal interference of the power frequency 50Hz and the generated harmonic is greatly eliminated, and the characteristic identification performance is improved. As shown in fig. 8, is frequency domain data in which fs=6400 Hz is acquired as raw data. As shown in fig. 9, in the case of f= 783.333Hz, the processed frequency domain data retains the characteristic current energy at 783.333Hz, and other disturbance currents are suppressed.
In a specific implementation, the present application provides a computer storage medium and a corresponding data processing unit, where the computer storage medium is capable of storing a computer program, where the computer program when executed by the data processing unit may perform part or all of the steps in the method for identifying a region based on Z-plane pole-zero design provided by the present application. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random-access memory (random access memory, RAM), or the like.
It will be apparent to those skilled in the art that the technical solutions in the embodiments of the present invention may be implemented by means of a computer program and its corresponding general hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied essentially or in the form of a computer program, i.e. a software product, which may be stored in a storage medium, and include several instructions to cause a device (which may be a personal computer, a server, a single-chip microcomputer, MUU or a network device, etc.) including a data processing unit to perform the methods described in the embodiments or some parts of the embodiments of the present invention.
The invention provides a thought and a method for identifying a platform area based on Z-plane zero pole design, and the method and the way for realizing the technical scheme are numerous, the above is only a preferred embodiment of the invention, and it should be pointed out that a plurality of improvements and modifications can be made to those skilled in the art without departing from the principle of the invention, and the improvements and modifications are also considered as the protection scope of the invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (4)
1. A Z-plane pole-zero design-based station area identification method is characterized by comprising the following steps:
Step 1, equipment to be identified in a power grid, namely transmitting equipment transmits characteristic current containing specific codes into the power grid;
Step 2, the receiving equipment in the power grid reduces the current and samples the current signal to obtain a sampling result;
Step 3, extracting and demodulating the characteristic current of the sampling result to obtain demodulation information;
Step 4, comparing the demodulation information with expected data, completing the identification of the station areas, and establishing a station area relation;
The method for extracting and demodulating the characteristic current in the step 3 comprises the following steps:
step 3-1, designing a filter according to the Z-plane characteristics;
step 3-2, extracting the characteristic current by using the filter and demodulating;
The method for designing the filter in the step 3-1 comprises the following steps:
Step 3-1-1, setting poles and zeros according to frequency points of the characteristic current;
Step 3-1-2, calculating to obtain a transfer function of the Z plane;
The pole and the zero are set according to the frequency point of the characteristic current in the step 3-1-1, and the method specifically comprises the following steps:
Setting a pole:
in the Z plane, two frequency points corresponding to the characteristic current are respectively provided with a pole;
Setting a zero point:
Every other in the Z plane Setting n zero points; wherein, n meets the points on the Z plane unit circle corresponding to the power frequency 50Hz and 50Hz harmonic wave, and falls into the n zero points;
wherein, the transfer function of the Z plane is obtained by calculation in the step 3-1-2, which comprises the following steps:
according to the zero point set in the step 3-1-1, the corresponding polynomial is as follows:
according to the poles set in the step 3-1-1, the corresponding polynomials are as follows:
1-e2*π*f/fsZ-1
the transfer function of the Z-plane is:
wherein n is the maximum order of zero; f is a preset frequency which is a frequency point corresponding to the characteristic current, fs is a sampling rate of current data acquisition;
The demodulation method in the step 3-2 is as follows: according to h (m), demodulated information after demodulation is obtained, and the specific method is as follows:
Integrating the absolute value of the processed data h (m) within 0.6s, and judging according to the integral size to obtain a binary value of 0 or 1; finally, determining whether the characteristic current is received or not by judging whether the specific code is received or not;
In the step 3-2, the filter is used for extracting the characteristic current, and the specific method comprises the following steps:
according to the inverse Z transformation principle of the Z plane transfer function H (Z), calculating to obtain data H (m) after m-moment processing:
h(m)＝x(m)-x(m-t)+e2*π*f/fs*h(m-1)
Wherein x (m) represents sampling data at m time; x (m-t) represents the sampled data at m-t.
2. The method for identifying a region based on a Z-plane pole-zero design of claim 1, wherein fs=6400 hz and n=3456 are set in step 3-1-2.
3. The method for identifying a region based on a Z-plane pole-zero design according to claim 2, wherein f= 783.333Hz or 883.333Hz is set in step 3-1-2.
4. A method of region identification based on Z-plane pole-zero design according to claim 3, wherein the specific code is 0 xAAE.
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