A multi-channel electric energy metering pulse generator

Abstract

This invention provides a multi-channel power metering pulse generator, including a digital-to-analog converter module, a power calculation module, a pulse generation module, and a power line configuration module. The digital-to-analog converter module samples voltage and current signals on the power lines. The input of the power calculation module is connected to the digital-to-analog converter module to obtain the instantaneous power for each channel. The input of the pulse generation module is connected to the power calculation module, converting the instantaneous power sequence obtained by the power calculation module into a pulse signal and outputting a power metering pulse signal. The power line configuration module connects the power calculation module and the pulse generation module, and is used to set the correspondence between the input power lines and the output power pulse signals. This invention can measure voltage and current signals on multiple power lines and output multiple power metering pulse signals, and the correspondence between the input power lines and the output power pulse signals can be flexibly adjusted.

Description

Technical Field

[0001] This invention relates to the field of electrical energy metering technology, and in particular to a multi-channel electrical energy metering pulse generator. Background Technology

[0002] As remote centralized meter reading technology for residential users matures and is applied in practice, its functionality has expanded beyond simply accurately recording total monthly electricity consumption data from ordinary meters. Its capabilities are evolving towards data mining, encompassing applications such as storing basic meter data and performing various statistical analyses, monitoring user electricity consumption, and identifying abnormal usage. To optimize power grid operation and manage user equipment during peak hours, the demand for energy detection for different types of electrical equipment is increasing. Meter reading technology is no longer solely based on user meters but also on a variety of devices, including IoT sensors.

[0003] The existing remote centralized meter reading system for residential users is generally completed through the user's electricity meter. For mechanical meters, this is mainly done through pulse counting, processing, and transmission; for electronic meters, it is done through pulse counting, processing, or reading and transmission via RS-485 port. Each user's electricity meter usually only records the total energy value and generates one pulse output, which can no longer meet the new requirements for monitoring different types of electrical equipment.

[0004] Existing methods for generating pulses for electricity metering sample, calculate, and convert pulse signals for a single power line. This is unsuitable for applications requiring unified metering of multiple power lines. Metering and pulse signal conversion for multiple power lines necessitates multiple devices. Furthermore, in densely populated areas such as student dormitories and supermarkets, where load variations are significant, or during peak and off-peak hours, current technologies cannot differentiate between different load conditions and do not support malicious load identification. Summary of the Invention

[0005] This invention provides a multi-channel power metering pulse generator that can measure voltage and current signals on multiple power lines and output multiple power metering pulse signals. The correspondence between the input power lines and the output power pulse signals can be flexibly adjusted.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A multi-channel power metering pulse generator includes a digital-to-analog conversion module, a power calculation module, a pulse generation module, and a power line configuration module;

[0008] The digital-to-analog conversion module includes multiple conversion units, each of which is connected to a power line for sampling voltage and current signals on the power line.

[0009] The input terminal of the power calculation module is connected to the digital-to-analog converter module, and the power is converted for each voltage signal and current signal of the digital-to-analog converter module to obtain the instantaneous power of each corresponding channel;

[0010] The input terminal of the pulse generation module is connected to the power calculation module, which converts the instantaneous power sequence obtained by the power calculation module into a pulse signal and outputs an energy metering pulse signal.

[0011] The power line configuration module connects the power calculation module and the pulse generation module, and is used to set the correspondence between the input power lines and the output power pulse signals;

[0012] The power calculation module calculates the instantaneous power of each channel based on the correspondence between the input power lines and the output power pulse signals set by the power line configuration module.

[0013] As a further preferred embodiment of the present invention, the conversion unit includes an analog-to-digital converter and a sampling controller; the analog-to-digital converter is used to convert voltage signals and current signals on the power line into digital quantities, and the output terminal of the sampling controller is connected to the analog-to-digital converter to control the period and accuracy of the analog-to-digital conversion.

[0014] As a further preferred embodiment of the present invention, the step of the power calculation module calculating the instantaneous power is as follows:

[0015] Determine the direction of instantaneous power: If the instantaneous power is positive, calculate the sum of the instantaneous power values; if the instantaneous power is negative, take the absolute value of the instantaneous power value and calculate the sum of the absolute values.

[0016] Each voltage and current signal of the analog-to-digital converter module is adjusted, converted according to its sampling period and accuracy, and convolution is performed according to the signal period to obtain the instantaneous power;

[0017] The instantaneous power is low-pass filtered, and then the power data of the power pulse signal is weighted and calculated according to the power line configuration information set by the power line configuration module to obtain the corresponding power data.

[0018] As a further preferred embodiment of the present invention, the pulse generation module includes a pulse generation section and a pulse output section;

[0019] The input terminal of the pulse generation section is connected to the power calculation module, which converts the instantaneous power sequence obtained by the power calculation module into a pulse signal; the input terminal of the pulse output section is connected to the pulse generation section, which is used to output the power metering pulse signal.

[0020] As a further preferred embodiment of the present invention, the pulse generation section outputs a pulse signal through threshold calculation, the calculation method being:

[0021] Compare the actual value of the instantaneous power with the threshold; if the actual value of the instantaneous power is higher than the threshold, perform variable threshold differentiation calculation; otherwise, perform variable threshold integration calculation.

[0022] As a further preferred embodiment of the present invention, the pulse output section includes a protective isolation circuit and outputs the power metering pulse signal in a passive output manner.

[0023] As a further preferred embodiment of the present invention, the power line configuration module can specify one or more power lines to output a certain power pulse signal.

[0024] As a further preferred embodiment of the present invention, it also includes a load analysis module and a sampling accuracy adjustment module. The input terminal of the load analysis module is connected to the power calculation module, and the input terminal of the sampling accuracy adjustment module is connected to both the power calculation module and the load analysis module. The load analysis module is used to analyze the real-time load status on the power line, and the sampling accuracy adjustment module controls the analog-to-digital conversion module according to the actual load status on the power line and the set accuracy adjustment algorithm, so as to adaptively adjust the sampling strategy of the analog-to-digital conversion module.

[0025] Compared with the prior art, the present invention has the following advantages or technical effects:

[0026] 1. This invention supports multiple power line signal inputs and multiple energy metering pulse signal outputs. By configuring the device parameters, multiple power lines can be freely selected and combined to generate the required energy metering pulse signals. It is suitable for IoT applications that require multi-channel sampling and multi-channel monitoring.

[0027] 2. This invention can analyze the load conditions and adjust the measurement cycle and accuracy according to the load conditions, which is beneficial to improving the accuracy of power metering in situations with drastic load changes.

[0028] 3. The pulse output module of this invention adopts a passive output method. Only with the addition of an external low-voltage DC power supply and a pull-up resistor can it output high and low level pulse signals. The advantage of this approach is that the pulse signal axis value can be flexibly set to input pulse counters with different input signal amplitudes. Attached Figure Description

[0029] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the spirit of the invention.

[0030] Figure 1 This is a schematic diagram of the structure of a multi-channel power metering pulse generator according to the present invention;

[0031] Figure 2 This is a schematic diagram of the analog-to-digital conversion module in this application;

[0032] Figure 3 This is a schematic diagram illustrating the calculation of output pulse power in this application. Implementation

[0033] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

[0034] Example: Figure 1 As shown, the present invention provides a multi-channel power metering pulse generator, including: a digital-to-analog conversion module, a sampling accuracy adjustment module, a power line configuration module, a power calculation module, a load analysis module, and a pulse generation module. It can measure the voltage and current signals of the monitored branches, and can analyze the load conditions and adjust the measurement cycle and accuracy.

[0035] The digital-to-analog converter module includes multiple conversion units, each connected to a power line for sampling voltage and current signals on the power line. For example... Figure 2 As shown, the conversion unit includes an analog-to-digital converter (ADC) and a sampling controller. The ADC is used to convert voltage and current signals on the power line into digital quantities. The output of the sampling controller is connected to the ADC and is used to control the cycle and accuracy of the ADC conversion.

[0036] like Figure 3As shown, the input of the power calculation module is connected to the analog-to-digital converter module to calculate the instantaneous power corresponding to the output power pulse signal. First, the direction of the instantaneous power is determined. If the instantaneous power is positive, the sum of the instantaneous values ​​is calculated to determine the energy of the positive power. If the instantaneous power is negative, the absolute value of the instantaneous value is taken, and the sum of these absolute values ​​is calculated to determine the energy of the absolute value of the negative power. Then, each voltage signal v(t) and current signal i(t) from the analog-to-digital converter module is adjusted, converted according to its sampling period and precision, and convolved according to the signal period to obtain the instantaneous power p(t). The instantaneous power p(t) is then low-pass filtered to obtain a power P(j) with less ripple. Finally, based on the power line configuration information, the power data that need to be jointly generated into the power pulse signal are weighted and calculated to obtain the corresponding power data.

[0037] The pulse generation module comprises a pulse generation section and a pulse output section. The input of the pulse generation section is connected to the power calculation module. Based on the power line configuration information, it converts the instantaneous power sequence obtained by the power calculation module into a pulse signal of a certain frequency using a specific power-to-energy metering pulse conversion method. The pulse signal output is calculated by comparing the actual instantaneous power value with a threshold. If the actual instantaneous power value is higher than the threshold, a variable threshold differential calculation is performed; otherwise, a variable threshold integral calculation is performed. This method can adjust the pulse signal frequency, improving the uniformity of the output energy metering pulse.

[0038] The input terminal of the pulse output section is connected to the pulse generator section to output the actual power metering pulse signal. It employs a passive output method, requiring an external low-voltage DC power supply and pull-up resistors to output high and low level pulse signals. The advantage of this approach is that the pulse signal axis value can be flexibly set to allow input to pulse counters with different input signal amplitudes.

[0039] In one embodiment, the input of the load analysis module is connected to the power calculation module, which is used to analyze the real-time load status on the power line, adjust calibration parameters, power thresholds, and optimize sampling algorithms and pulse generation processing methods.

[0040] The input of the sampling accuracy adjustment module is connected to the power calculation module and the load analysis module. Based on the actual load conditions on the power line and the set accuracy adjustment algorithm, the sampling accuracy adjustment module controls the analog-to-digital converter (ADC) module, enabling adaptive adjustment of the ADC module's sampling strategy.

[0041] The power line configuration module connects the power calculation module and the pulse generation module, and is used to set the correspondence between the input power lines and the output power pulse signals. Users can specify one or more power lines corresponding to a specific power pulse signal output. This achieves a logical correspondence between M power line inputs and N power pulse signal outputs in the device.

[0042] In summary, this invention provides a multi-channel power metering pulse generator, a design method for a power metering pulse generator that supports multiple power line signal inputs and can generate multiple power metering pulses, and allows for the free selection and combination of multiple power lines by configuring device parameters to generate the required power metering pulse signals. It is suitable for IoT applications requiring multi-channel sampling and monitoring. It can analyze load conditions, adjust the measurement cycle and accuracy, and provides speed and accuracy in power metering under conditions of drastic load changes. The pulse output module adopts a passive output method; only with an external low-voltage DC power supply and pull-up resistors can it output high and low level pulse signals. The advantage of this approach is that the pulse signal axis value can be flexibly set to allow input to pulse counters with different input signal amplitudes.

Claims

1. A multi-channel power metering pulse generator, characterized in that, It includes a digital-to-analog conversion module, a power calculation module, a pulse generation module, and a power line configuration module; The digital-to-analog conversion module includes multiple conversion units, each of which is connected to a power line for sampling voltage and current signals on the power line. The input terminal of the power calculation module is connected to the digital-to-analog converter module, and the power is converted for each voltage signal and current signal of the digital-to-analog converter module to obtain the instantaneous power of each corresponding channel; The input terminal of the pulse generation module is connected to the power calculation module, which converts the instantaneous power sequence obtained by the power calculation module into a pulse signal and outputs an energy metering pulse signal. The power line configuration module connects the power calculation module and the pulse generation module, and is used to set the correspondence between the input power lines and the output power pulse signals; The power calculation module calculates the instantaneous power of each channel based on the correspondence between the input power lines and the output power pulse signals set by the power line configuration module.

2. The multi-channel power metering pulse generator according to claim 1, characterized in that, The conversion unit includes an analog-to-digital converter (ADC) and a sampling controller. The ADC is used to convert voltage and current signals on the power line into digital quantities. The output of the sampling controller is connected to the ADC and is used to control the cycle and accuracy of the ADC conversion.

3. The multi-channel power metering pulse generator according to claim 1, characterized in that, The steps for the power calculation module to calculate instantaneous power are as follows: Determine the direction of instantaneous power: If the instantaneous power is positive, calculate the sum of the instantaneous power values; if the instantaneous power is negative, take the absolute value of the instantaneous power value and calculate the sum of the absolute values. Each voltage and current signal of the analog-to-digital converter module is adjusted, converted according to its sampling period and accuracy, and convolution is performed according to the signal period to obtain the instantaneous power; The instantaneous power is low-pass filtered, and then the power data of the power pulse signal is weighted and calculated according to the power line configuration information set by the power line configuration module to obtain the corresponding power data.

4. A multi-channel power metering pulse generator according to claim 1, characterized in that, The pulse generation module includes a pulse generation section and a pulse output section; The input terminal of the pulse generation section is connected to the power calculation module, which converts the instantaneous power sequence obtained by the power calculation module into a pulse signal; The input terminal of the pulse output section is connected to the pulse generator section and is used to output the energy metering pulse signal.

5. A multi-channel power metering pulse generator according to claim 4, characterized in that, The pulse generation section outputs a pulse signal through threshold calculation, the calculation method of which is as follows: Compare the actual value of the instantaneous power with the threshold; if the actual value of the instantaneous power is higher than the threshold, perform variable threshold differentiation calculation; otherwise, perform variable threshold integration calculation.

6. A multi-channel power metering pulse generator according to claim 4, characterized in that, The pulse output section includes a protective isolation circuit and outputs the power metering pulse signal in a passive output manner.

7. A multi-channel power metering pulse generator according to claim 1, characterized in that, The power line configuration module can specify one or more power lines to output a specific power pulse signal.

8. A multi-channel power metering pulse generator according to claim 1, characterized in that, It also includes a load analysis module and a sampling accuracy adjustment module. The input of the load analysis module is connected to the power calculation module, and the input of the sampling accuracy adjustment module is connected to both the power calculation module and the load analysis module. The load analysis module is used to analyze the real-time load status on the power line, and the sampling accuracy adjustment module controls the analog-to-digital conversion module according to the actual load status on the power line and the set accuracy adjustment algorithm, so as to adaptively adjust the sampling strategy of the analog-to-digital conversion module.

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