CN116400157A - Method and device for measuring equivalent electrical parameters of ion tube - Google Patents

Abstract

The invention discloses a method and a device for measuring equivalent electrical parameters of an ion tube, comprising the following steps: s1, training a neural network calculation model by adopting low-voltage side voltage, current signals and high-voltage side voltage signals of an ion tube transformer; s2, obtaining a low-voltage side voltage and current signal of the ion tube transformer, and calculating a high-voltage side voltage signal based on a neural network model; s3, calculating equivalent electrical parameters of the ion tube according to the calculated high-voltage side voltage signals. The method has the advantages of being capable of measuring equivalent electrical parameters of the ion tube without a high-voltage probe and an external measurement capacitor, being beneficial to realizing the detection engineering of the parameters of the ion tube, being safe and efficient, and the like.

Description

A method and device for measuring equivalent electrical parameters of an ion tube

technical field

The invention relates to a method and a device for measuring equivalent electric parameters of an ion tube.

Background technique

The ion tube is a dielectric barrier discharge device widely used in the field of air quality control. The operating status and parameters of the ion tube are the key factors affecting the efficiency of air quality control. During the use of the ion tube, since the processed object is the air to be treated that contains dust and tiny particles, in the high voltage environment where the ion tube works, the accumulation of dust and tiny particles will block the discharge channel of the ion tube, which will As a result, the discharge capacity of ion tubes that work continuously has a tendency to gradually decline, which will eventually affect the efficiency of air quality control. Therefore, how to monitor the working status of ion tubes in real time and accurately is the focus and difficulty of ion tube use and maintenance.

As a typical dielectric barrier discharge device, the working state of the ion tube can be divided into non-discharging state and discharging state. The equivalent circuit of the non-discharging state is the series connection of the dielectric capacitance and the air gap capacitance, and the equivalent circuit of the discharging state is the dielectric Capacitor in series with Zener diode in breakdown state. Therefore, the working state of the ion tube can be characterized by the parameters of the equivalent circuit of the ion tube, that is, the working state of the ion tube can be analyzed by obtaining the parameters of the equivalent circuit of the ion tube. The equivalent electrical parameters of the ion tube include the dielectric capacitance and the air gap capacitance.

The existing method for measuring the equivalent electrical parameters of a dielectric barrier discharge device requires setting a measurement capacitor and a high-voltage probe in the working circuit of the discharge device, and using an oscilloscope to obtain the Lissajous figure of the device. This method is only applicable to the laboratory environment. On-line measurement of equivalent electrical parameters of ion tubes in actual work cannot be carried out, and there are problems such as high cost, need to be exposed to high voltage, and inability to realize the automation of parameter measurement.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a low-cost, safe and reliable ion tube equivalent electrical parameter measurement method and device that is easy to realize the engineering application of parameter measurement.

The technical solution of the present invention to solve the above problems is: a method and device for measuring the equivalent electrical parameters of an ion tube, comprising the following steps:

S1. Use the ion tube transformer low-voltage side voltage, current signal and high-voltage side voltage signal to train the neural network calculation model;

S2. Obtain the voltage and current signals of the low-voltage side of the ion tube transformer, and calculate the voltage signal of the high-voltage side based on the neural network model;

S3. Calculate the equivalent electrical parameters of the ion tube based on the calculated high voltage side voltage signal.

The effect of the present invention is that: for the measurement of the equivalent electrical parameters of the ion tube, compared with the traditional method, the present invention provides a low-cost, safe and reliable measurement method and device that is easy to realize the engineering application of parameter measurement. The advantage of this parameter measurement method is that there is no need to change the working circuit of the ion tube during the actual measurement process, that is, there is no need to connect a measuring capacitor in the working circuit of the ion tube; The sampling capacitor is connected in parallel; no multi-channel oscilloscope is needed, that is, no oscilloscope is required to draw a Lissajous diagram, and then calculate the slope of the two sides of the parallelogram by drawing points on the diagram; it is convenient for the engineering of parameter measurement. In the measurement device of the system, equivalent electrical parameters can be calculated directly based on the calculated data set.

Description of drawings

Fig. 1 is a flowchart of the present invention

Fig. 2 is the ion tube characteristic measurement circuit diagram in the present invention

Fig. 3 is the data set oscillogram of training neural network in the present invention

Fig. 4 is a measurement scheme figure of the present invention

Fig. 5 is the measurement circuit diagram of ion tube equivalent electric parameter in the present invention

Fig. 6 is a comparison chart between the calculation value of the voltage signal neural network of the middle and high voltage side of the present invention and the actual measurement value

Fig. 7 is the ion tube Lissajous diagram drawn by the calculated value in the present invention

Fig. 8 is a schematic diagram of fixed-point search strategy calculation in the present invention

Implementation

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

A kind of ion tube equivalent electrical parameter measuring method and device of the present invention, its flow chart as shown in Figure 1, comprises the following steps:

S1. Use the ion tube transformer low-voltage side voltage, current signal and high-voltage side voltage signal to train the neural network calculation model;

S2. Obtain the voltage and current signals of the low-voltage side of the ion tube transformer, and calculate the voltage signal of the high-voltage side based on the neural network model;

S3. Calculate the equivalent electrical parameters of the ion tube based on the calculated high voltage side voltage signal.

1. The specific process of step S1 includes:

S1.1. Build the ion tube characteristic measurement circuit shown in Figure 2, the circuit includes a single-phase 220V AC power supply, ion tube transformer, ion tube, measuring capacitance (C _M , C ₁ , C ₂ ), voltage sensor PT, Current sensor CT, 4-channel oscilloscope. The single-phase 220V AC power supply is connected to the low-voltage side of the ion tube transformer, and the voltage sensor and current sensor are used to measure the _voltage and current signals of the low-voltage side of the ion tube transformer; Capacitors C ₁ and C ₂ are connected in series with the high voltage side of the ion tube transformer. The measuring capacitor C _M is used to measure the charge in the working process of the ion tube. The sampling capacitors C ₁ and C ₂ are used to obtain the working voltage of the ion tube, and based on the capacitance analysis According to the voltage principle, the low-voltage signal that can be used for oscilloscope measurement is obtained. In the present invention, the value of the measurement capacitor C _M is 0.47uF, the capacitor _C1 is 47pF, and the capacitor _C2 is 47000pF; the 4-channel oscilloscope is used to record the low-voltage side voltage U and current I, And the total voltage V _W of the high voltage side and the measurement voltage V _M ;

S1.2. Construct a neural network calculation model. The constructed neural network adopts a three-layer structure, in which the input layer consists of 2 neurons, the hidden layer includes 5 neurons, and the output layer consists of 2 neurons; the input layer neurons The neurons in the output layer correspond to the voltage and current signals on the low-voltage side of the ion tube transformer, and the neurons in the output layer correspond to the total voltage on the high-voltage side and the measured voltage signal;

S1.3. Train the neural network calculation model, use the recorded voltage and current signals on the low-voltage side and the total voltage and measured voltage signals on the high-voltage side as sample data for training the neural network. The sample data contains 4 groups of 1000 points, as shown in Figure 3 , where Figure 3(1) is the voltage signal U on the low-voltage side, Figure 3(2) is the current signal I on the low-voltage side, Figure 3(3) is the total voltage signal V _W on the high-voltage side, and Figure 3(4) is the measured voltage on the high-voltage side Signal V _M ; in order to improve the efficiency of neural network training, the current signal on the low-voltage side is integrated and processed first, and then input into the neural network; finally, the neural network model is trained using the error back propagation algorithm, and the trained network model is obtained.

2. The specific process of step S2 includes:

The measurement scheme of the present invention is as shown in Figure 4, adopts voltage sensor and current sensor to measure the voltage of ion tube transformer low voltage side, current signal respectively, and current signal is carried out integration to obtain electric charge; Low voltage side voltage signal and electric charge input training A good neural network model calculates the total voltage and measured voltage on the high-voltage side from the network model, and finally draws the Lissajous diagram and calculates the equivalent electrical parameters.

S2.1. Build the ion tube equivalent electrical parameter measurement circuit as shown in Figure 5, the circuit includes a single-phase 220V AC power supply, ion tube transformer, ion tube, voltage sensor, current sensor, parameter measuring device; single-phase 220V AC power supply It is connected to the low-voltage side of the ion tube transformer, and the voltage sensor and current sensor are used to measure the voltage and current signals of the low-voltage side of the ion tube transformer respectively; the ion tube is connected to the high-voltage side of the ion tube transformer; the parameter measuring device obtains the ion tube transformer sampled by the voltage and current sensors Low-voltage side voltage U and current I, the number of sampling points is 1000 points, and the sampling time is 40ms;

S2.2. Calculate the high-voltage side voltage signal based on the neural network model, store the trained neural network model in the parameter measurement device, and send the obtained low-voltage side voltage and current signals into the neural network for calculation by the neural network The corresponding high-voltage side voltage signal is obtained; the calculation results are shown in Figure 6, Figure 6(1) is a comparison chart of the calculated value and measured value of the total voltage at the high-voltage side, and Figure 6(2) is a comparison between the calculated value and the measured value of the measured voltage at the high-voltage side It can be seen from the figure that the high-voltage side voltage signal calculated by the constructed neural network has a small calculation error.

3. The specific process of step S3 is:

S3.1. Draw a Lissajous diagram according to the calculated high-voltage side voltage signal data set, as shown in Figure 7, which is a typical DBD discharge characteristic diagram; combined with Figure 7, use a fixed-point search strategy to calculate the slope of the parallelogram in the Lissajous diagram , its calculation principle is shown in Figure 8, and the process is as follows: ①First search the data point in the data set whose absolute value of the measured voltage is less than 0.5, and record the serial number of the data point in the data set, as shown in Figure 8. Points A and B ②Divide the searched data point numbers into two categories, the total voltage corresponding to the first type of data point number is positive, as shown in Figure 8 at point B, the second type of data point number corresponding to the total voltage is negative , as point A in Figure 8; ③ centering on the serial number of each first-type data point, take the serial number with an interval of 15 before and after it, and calculate the slope of the corresponding line segment based on the total voltage and the measured voltage corresponding to the serial number, and finally Calculate the average value of the slope of the line segment corresponding to the serial number of all first-type data points, which is counted as k1. In Figure 8, the line segment corresponding to the serial number of point B is CD, and its slope is calculated as k11; ④ Take each second-type data point As a benchmark, find in the data set that the absolute value of the deviation from the total voltage corresponding to the second type of data point is less than 0.3, and the serial number of the data point corresponding to the measured voltage is less than -10, such as point E in Figure 8, and the interval before and after it is 10 serial number, and calculate the slope of the corresponding line segment based on the total voltage and the measured voltage corresponding to the serial number, and finally calculate the average value of the slope of the line segment corresponding to the serial number of all second-type data points, which is counted as k2. In Figure 8, first find the slope corresponding to Point E corresponding to the serial number of point A, then get the line segment corresponding to point E as FG, and calculate its slope as k21.

S3.2. Calculate the equivalent electrical parameters of the ion tube according to the calculated slope, the parameters are: dielectric capacitance C _d and air gap capacitance C _g ; the calculation formula is:

C _d = (k2×C _M )/1000

Cg = (k1×k2×C _M )/[( k1-k2)×1000]

4. The ion tube equivalent electrical parameter measurement device includes a sensor module, AD module, embedded processor, parameter display screen, and serial port module; the serial port is used to load the neural network model, and the voltage and current sensors are used to obtain the low voltage side of the ion tube transformer. Voltage and current signals, the AD module is used to convert the sampled low-voltage side voltage and current signals into digital signals, and the embedded processor is used for current signal integral processing, neural network calculation, Lissajous figure slope calculation and ion tube equivalent electrical parameters For calculation, the display screen is used to display the Lissajous figure and the equivalent electrical parameters of the ion tube.

Claims (5)

1. A method and device for measuring an ion tube equivalent electrical parameter, comprising the following steps: S1. Use the ion tube transformer low-voltage side voltage, current signal and high-voltage side voltage signal to train the neural network calculation model; S2. Obtain the voltage and current signals of the low-voltage side of the ion tube transformer, and calculate the voltage signal of the high-voltage side based on the neural network model; S3. Calculate the equivalent electrical parameters of the ion tube based on the calculated high voltage side voltage signal. 2. ion tube equivalent electric parameter measuring method and device according to claim 1, is characterized in that the concrete steps of described step S1 comprise: S1.1. Construct the ion tube characteristic measurement circuit, which includes single-phase 220V AC power supply, ion tube transformer, ion tube, measuring capacitor, voltage sensor, current sensor, 4-channel oscilloscope; single-phase 220V AC power supply and ion tube transformer low voltage The voltage sensor and current sensor are used to measure the voltage and current signals of the low-voltage side of the ion tube transformer respectively; the ion tube and the measuring capacitor are connected to the high-voltage side of the ion tube transformer, and the measuring capacitor is used to measure the working voltage and charge of the ion tube; 4-channel oscilloscope Used to record voltage and current signals on the low-voltage side and voltage signals on the high-voltage side; S1.2. Construct a neural network calculation model. The constructed neural network adopts a three-layer structure, in which the input layer consists of 2 neurons, the hidden layer includes 5 neurons, and the output layer consists of 2 neurons; the input layer neurons The neurons of the ion tube transformer correspond to the voltage and current signals on the low-voltage side of the ion tube transformer, and the output layer neurons correspond to the voltage signals on the high-voltage side; S1.3. Train the neural network calculation model, use the recorded low-voltage side voltage and current signals and the high-voltage side voltage signal as sample data for training the neural network; first perform integral processing on the low-voltage side current signal, and then input it into the neural network; use error feedback Train the neural network model to the propagation algorithm to obtain the trained network model. 3. ion tube equivalent electrical parameter measuring method and device according to claim 1, is characterized in that the concrete steps of described step S2 comprise: S2.1. Build an ion tube equivalent electrical parameter measurement circuit, which includes a single-phase 220V AC power supply, ion tube transformer, ion tube, voltage sensor, current sensor, parameter measurement device; single-phase 220V AC power supply and ion tube transformer low voltage side connection, the voltage sensor and current sensor are used to measure the voltage and current signals of the low-voltage side of the ion tube transformer respectively; the ion tube is connected to the high-voltage side of the ion tube transformer; the parameter measuring device obtains the voltage and current of the low-voltage side of the ion tube transformer sampled by the current sensor Signal; S2.2. Calculate the high-voltage side voltage signal based on the neural network model, store the trained neural network model in the parameter measurement device, and send the obtained low-voltage side voltage and current signals into the neural network for calculation by the neural network Output the corresponding high voltage side voltage signal. 4. ion tube equivalent electrical parameter measuring method and device according to claim 1, is characterized in that the concrete process of described step S3 is: S3.1. Draw a Lissajous diagram according to the calculated high-voltage side voltage signal data set, and use a fixed-point search strategy to calculate the slope of the parallelogram in the Lissajous diagram; S3.2. Calculate the equivalent electrical parameters of the ion tube according to the calculated slope, and the parameters are: dielectric capacitance C _d and air gap capacitance C _g . 5. ion tube equivalent electric parameter measuring method and device according to claim 1, is characterized in that said device comprises sensor module, AD module, embedded processor, parameter display screen, serial port module; Wherein serial port is used for loading The neural network model, the voltage and current sensors are used to obtain the voltage and current signals of the low-voltage side of the ion tube transformer, the AD module is used to convert the sampled low-voltage side voltage and current signals into digital signals, the embedded processor is used for current signal integral processing, neural Network calculation, Lissajous diagram slope calculation and ion tube equivalent electrical parameter calculation, the display screen is used to display Lissajous diagram and ion tube equivalent electrical parameters.

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