Charging load electric energy metering system based on electricity consumption identification

Abstract

The utility model provides a charging load electric energy metering system based on power utilization identification. The charging load electric energy metering system comprises a plurality of power utilization identification terminals, an intelligent electric meter, a 4G / 5G concentrator and a monitoring master station server. The plurality of power consumption identification terminals are in communication connection with the intelligent electric meter through power line carrier communication, the intelligent electric meter is in wireless communication connection with the 4G / 5G concentrator through 4G / 5G, and the 4G / 5G concentrator is in network communication connection with the monitoring master station server. The electricity consumption identification end comprises an MCU module, and an electricity consumption metering circuit, a signal modulation circuit and a high-frequency carrier generation circuit which are electrically connected with the MCU module, the output end of the high-frequency carrier generation circuit is connected with the signal modulation circuit, the output end of the signal modulation circuit is electrically connected with the signal coupling circuit, and the electricity consumption metering circuit and the signal coupling circuit are both electrically connected with the mains supply line. According to the utility model, scattered and diversified charging loads are accurately distinguished through the electricity utilization identification end, and fine metering according to equipment and users is realized.

Description

Technical Field

[0001] This utility model relates to the field of load electricity metering technology, specifically a charging load electricity metering system based on electricity consumption identification. Background Technology

[0002] In today's society, the widespread use of electric vehicles and various electric devices has led to a continuous increase in the proportion of charging load in the power system. Traditional electricity metering methods are gradually revealing many shortcomings when dealing with the metering of charging load electricity.

[0003] On the one hand, most traditional electricity meters are designed based on simple single-phase or three-phase metering principles, making it difficult to accurately distinguish between dispersed and diverse charging loads. In scenarios such as large parking lots and residential community charging pile clusters, numerous charging devices operate simultaneously, and traditional electricity meters cannot accurately identify the electricity consumption details of each charging device. This fails to meet the demand for refined metering by device and by user, easily leading to chaotic electricity bill calculations and inefficient energy management.

[0004] On the other hand, in the data transmission stage, wired communication or simple wireless transmission technology has been the primary methods used in the past. Wired communication involves complex cabling, high costs, and difficult maintenance, making it extremely difficult to implement given the widespread and varied locations of charging stations. Traditional wireless transmission technology suffers from poor signal stability, low transmission rates, and susceptibility to interference, resulting in frequent delays, loss, or errors in the transmission of electricity data from the meter to the management terminal. This severely impacts the power sector's real-time monitoring and effective management of charging loads. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a charging load energy metering system based on electricity consumption identification, so as to overcome the shortcomings of the prior art described in the background.

[0006] To solve the above-mentioned technical problems, the embodiments of this utility model provide the following technical solutions:

[0007] A charging load energy metering system based on electricity consumption identification includes multiple electricity consumption identification terminals connected to the charging load, a smart meter, a 4G / 5G concentrator, and a monitoring master station server; the multiple electricity consumption identification terminals are connected to the smart meter via power line carrier communication, the smart meter is connected to the 4G / 5G concentrator via 4G / 5G wireless communication, and the 4G / 5G concentrator is connected to the monitoring master station server via network communication.

[0008] The electricity consumption identification terminal includes an MCU module and an electricity metering circuit, a signal modulation circuit, and a high-frequency carrier generation circuit electrically connected to the MCU module. The output terminal of the high-frequency carrier generation circuit is connected to the signal modulation circuit, and the output terminal of the signal modulation circuit is electrically connected to the signal coupling circuit. Both the electricity metering circuit and the signal coupling circuit are electrically connected to the mains power supply line.

[0009] Optionally, the electricity metering circuit includes a voltage sampling circuit, a current sampling circuit, and an energy metering chip, wherein the voltage sampling circuit and the current sampling circuit are electrically connected to the energy metering chip.

[0010] Optionally, the high-frequency carrier generation circuit is a square wave to sine wave circuit based on an operational amplifier.

[0011] Optionally, the signal modulation circuit is a multiplier circuit based on the AD835ARZ chip.

[0012] Optionally, the signal coupling circuit is a signal coupling circuit based on the power transformer LT21-205.

[0013] Optionally, TVS2 surge protection diodes are connected in parallel at both the input and output terminals of the power transformer LT21-205.

[0014] Optionally, the smart meter is a smart meter with power line carrier communication and 4G / 5G communication functions.

[0015] Optionally, the power metering chip is model ATT7022E.

[0016] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0017] 1. This utility model identifies the electricity consumption information of each charging load at the electricity consumption identification terminal connected to the charging load through a signal modulation circuit, a high-frequency carrier generation circuit, and a signal coupling circuit. It can accurately distinguish dispersed and diverse charging loads. Combined with an energy metering chip and an energy meter, it can achieve refined metering by device and by user.

[0018] 2. This utility model uses power line carrier communication to connect the electricity consumption identification terminal and the smart meter, eliminating the need for additional complex communication lines. Data transmission can be achieved using existing power lines, significantly reducing wiring costs and construction difficulty. Simultaneously, combined with centralized management via 4G / 5G wireless communication, it improves the efficiency of electricity metering management. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0020] Figure 2This is a schematic diagram of the voltage sampling circuit of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0021] Figure 3 This is a schematic diagram of the current sampling circuit of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0022] Figure 4 This is a circuit diagram of the energy metering chip of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0023] Figure 5 This is a schematic diagram of the high-frequency carrier generation circuit of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0024] Figure 6 This is a schematic diagram of the signal modulation circuit of the charging load energy metering system based on electricity consumption identification according to this utility model.

[0025] Figure 7 This is a schematic diagram of the signal coupling circuit of the charging load energy metering system based on electricity consumption identification according to this utility model. Detailed Implementation

[0026] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, this utility model proposes a charging load energy metering system based on electricity consumption identification, including multiple electricity consumption identification terminals connected to the charging load, a smart meter 6, a 4G / 5G concentrator 7, and a monitoring master station server 8; the multiple electricity consumption identification terminals are connected to the smart meter 6 via power line carrier communication, the smart meter 6 is connected to the 4G / 5G concentrator 7 via 4G / 5G wireless communication, and the 4G / 5G concentrator 7 is connected to the monitoring master station server 8 via network communication.

[0028] The electricity consumption identification terminal includes an MCU module 1 and an electricity metering circuit 2, a signal modulation circuit 3, and a high-frequency carrier generation circuit 5, which are electrically connected to the MCU module 1. The output terminal of the high-frequency carrier generation circuit 5 is connected to the signal modulation circuit 3, and the output terminal of the signal modulation circuit 3 is electrically connected to the signal coupling circuit 4. Both the electricity metering circuit 2 and the signal coupling circuit 4 are electrically connected to the mains power supply line.

[0029] The electricity metering circuit 2 includes a voltage sampling circuit, a current sampling circuit, and an energy metering chip, with the voltage sampling circuit, current sampling circuit, and energy metering chip being electrically connected. Figure 2 The diagram shows a voltage sampling circuit. In this circuit, a voltage transformer converts approximately 220V of mains power into a low-voltage signal. Figure 3The diagram shows a current sampling circuit. In this circuit, a through-hole current transformer is used, with the detection phase line passing through the transformer's hole. The signal output is connected to the current sampling circuit. The 1.2KΩ resistor and 0.01uF capacitor in both the voltage and current sampling circuits form an anti-aliasing filter to filter the signal.

[0030] like Figure 4 As shown, the energy metering chip model is ATT7022E. The ATT7022E is a multi-functional, high-precision three-phase energy metering chip suitable for three-phase three-wire and three-phase four-wire applications. The ATT7022E integrates a 7-channel second-order sigma-delta ADC, a reference voltage circuit, and digital signal processing circuits for all power, energy, RMS value, power factor, and frequency measurements. It can measure the active power, reactive power, apparent power, active and reactive quantities of each phase and the combined phase, as well as parameters such as phase current, RMS voltage, power factor, phase angle, and frequency, fully meeting the needs of three-phase multi-tariff multi-functional energy meters.

[0031] The MCU module outputs a square wave signal at the carrier frequency, which is then artificially synthesized into a high-frequency sine wave signal. A waveform conversion circuit converts the square wave signal at the carrier frequency into a sine wave signal of the same frequency as the carrier signal. The waveform conversion circuit is as follows: Figure 5 As shown, this is a square wave to sine wave circuit based on an operational amplifier, which completes the conversion of a carrier frequency square wave signal into a sine wave of the same frequency.

[0032] The modulation signal containing electricity consumption information is modulated with the carrier signal output from the waveform conversion circuit to output a specific frequency electricity consumption indicator signal containing the electricity consumption information. Since the carrier signal frequency is relatively high, the computational load is large considering accuracy requirements, and the MCU module cannot handle this operation. Therefore, the AD835ARZ analog multiplier circuit is selected to implement the modulation function. Figure 6 As shown, the modulated signal with power consumption information is input through the chip's X1 port, and the carrier signal with the calibrated frequency is input through the Y1 port. After ASK modulation, the digital modulated signal, i.e., the power consumption identification signal, is output through the W port.

[0033] like Figure 7 As shown, signal coupling circuit 4 is a signal coupling circuit based on power transformer LT21-205. The coupling circuit is a bridge for signal transmission between the electricity consumption identification terminal or electricity acquisition terminal and the power line network. Its main function is to couple and send the electricity consumption identification signal to the power line. At the same time, TVS2 surge protection diodes are connected in parallel at both the input and output terminals of power transformer LT21-205 to eliminate instantaneous current.

[0034] The smart meter 6 is a smart meter with power line carrier communication and 4G / 5G communication functions. On the one hand, it receives the modulated electrical identification signal sent to the power line through the coupling circuit via the electronic carrier module. On the other hand, after completing the electricity metering, it wirelessly sends the electricity data to the 4G / 5G concentrator via 4G / 5G, and finally realizes monitoring through the monitoring master station server 8.

[0035] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A charging load power metering system based on power signature, characterized in that, It includes a plurality of power consumption identification terminals connected with charging load, a smart meter (6), a 4G / 5G concentrator (7) and a monitoring master station server (8); the plurality of power consumption identification terminals are in communication connection with the smart meter (6) through power carrier communication, the smart meter (6) is in communication connection with the 4G / 5G concentrator (7) through 4G / 5G wireless communication, and the 4G / 5G concentrator (7) is in network communication connection with the monitoring master station server (8); The power consumption identification terminal includes an MCU module (1), a power consumption metering circuit (2) electrically connected with the MCU module (1), a signal modulation circuit (3), and a high-frequency carrier generation circuit (5); the high-frequency carrier generation circuit (5) is connected with the signal modulation circuit (3) at the output end; the signal modulation circuit (3) is electrically connected with a signal coupling circuit (4) at the output end; the power consumption metering circuit (2) and the signal coupling circuit (4) are both electrically connected with a commercial power supply line.

2. The power metering system for charging load based on power signature of claim 1, wherein, The power consumption metering circuit (2) includes a voltage sampling circuit, a current sampling circuit and an electric energy metering chip; the voltage sampling circuit, the current sampling circuit and the electric energy metering chip are electrically connected.

3. The power metering system for charging load based on power signature of claim 1, wherein, The high-frequency carrier generation circuit (5) is a square wave to sine wave circuit based on an operational amplifier.

4. The power metering system for charging load based on power signature of claim 1, wherein, The signal modulation circuit (3) is a multiplier circuit based on an AD835ARZ chip.

5. The power metering system for charging load based on power signature of claim 1, wherein, The signal coupling circuit (4) is a signal coupling circuit based on a power transformer LT21-205.

6. The power metering system for charging load based on power signature of claim 5, wherein, The input end and the output end of the power transformer LT21-205 are both connected in parallel with a TVS2 surge protection diode.

7. The power metering system for charge load based on power utilization identification according to claim 1, wherein, The smart meter (6) is a smart meter with power carrier communication and 4G / 5G communication functions.

8. The power metering system for charging load based on power signature of claim 2, wherein, The electric energy metering chip is an ATT7022E.

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