Theft and leakage analysis device

Abstract

This application relates to a device for analyzing electricity theft and leakage. The device includes an input unit, a processing unit, a power supply unit, and an electricity meter reading unit. The power supply unit includes three voltage output circuits and three current output circuits. The input unit receives configuration information input by the user. The processing unit controls the power supply unit to output simulated load current and simulated load voltage to the electricity meter according to the instructions in the configuration information. The electricity meter reading unit reads the electrical parameters measured by the electricity meter. The processing unit also compares the electrical parameters measured by the electricity meter with the electrical parameters of the simulated load current and simulated load voltage output by the power supply unit to determine whether there is electricity theft or leakage at the electricity meter. This device can select the electrical output mode according to the type of electricity meter and can adjust the phase between the simulated load current and simulated load voltage output to the electricity meter according to the phase value input by the user.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a device for analyzing electricity theft and leakage. Background Technology

[0002] With the development of the social economy and the increase in electricity consumption, the problem of electricity theft has become increasingly prominent, and the methods of electricity theft are becoming more and more high-tech, causing significant economic losses to power supply companies. Once a power supply company discovers a risk of electricity theft or leakage, it will cut off power to the site and dispatch maintenance personnel to analyze the situation using the on-site electricity meters. These meters include both three-phase and single-phase meters. The analysis of electricity theft and leakage using the on-site meters involves: a electricity theft analysis device providing the electricity meter with simulated load current and voltage, and adjusting the phase between the simulated load voltage and current according to different simulated loads. Based on the electrical parameters measured by the electricity meter and the electrical parameters of the simulated load current and voltage, the analysis of electricity theft and leakage is conducted.

[0003] However, existing leakage current analysis devices can only provide simulated load current and simulated load voltage to one type of energy meter. That is, single-phase leakage current analysis devices can only provide simulated load current and voltage to single-phase energy meters, and three-phase leakage current analysis devices can only provide simulated load current and voltage to three-phase energy meters. Furthermore, existing leakage current analysis devices cannot adjust the phase between simulated load voltage and simulated load current, meaning that existing leakage current analysis devices cannot analyze the leakage current of energy meters in the field under different simulated load types. Summary of the Invention

[0004] Therefore, it is necessary to provide a device for analyzing electricity theft and leakage in response to the above-mentioned technical problems.

[0005] This application provides a device for analyzing electricity theft and leakage. The device includes an input unit, a processing unit, a power supply unit, and an electricity meter reading unit. The power supply unit includes three voltage output circuits and three current output circuits. The voltage output circuits output simulated load voltage to the electricity meter, and the current output circuits output simulated load current to the electricity meter. The input unit receives configuration information input by the user. The configuration information indicates the power output mode and phase value. The power output mode includes a single-phase output mode or a three-phase output mode, and the phase value is the phase between the simulated load current and simulated load voltage output by the power supply unit. The processing unit controls the power supply unit to output simulated load current and simulated load voltage to the electricity meter according to the configuration information. The electricity meter reading unit reads the electrical parameters measured by the electricity meter. The processing unit also compares the electrical parameters measured by the electricity meter with the electrical parameters of the simulated load current and simulated load voltage output by the power supply unit to determine whether there is electricity theft or leakage at the electricity meter.

[0006] In one embodiment, the voltage output circuit includes: a DC voltage output circuit, a first SPWM wave output circuit, a first H-bridge circuit, and a voltage output port, wherein the DC voltage output circuit and the first SPWM wave output circuit are both connected to the first H-bridge circuit, and the first H-bridge circuit is connected to the voltage output port; the DC voltage output circuit is used to output a first DC voltage to the first H-bridge circuit according to the first PWM wave sent by the processing unit; the first SPWM wave output circuit is used to output a first SPWM wave to the first H-bridge circuit according to the synchronization signal and phase value sent by the processing unit; the first H-bridge circuit is used to output an AC voltage to the voltage output port based on the first DC voltage and the first SPWM wave.

[0007] In one embodiment, the device further includes an energy storage unit for providing power to the leakage current analysis device. The DC voltage output circuit includes: a PWM drive circuit, a boost circuit, and a rectifier filter circuit connected in sequence; the PWM drive circuit is used to drive a first PWM wave and transmit it to the boost circuit; the boost circuit is used to boost the DC voltage provided by the energy storage unit based on the first PWM wave; and the rectifier filter circuit is used to rectify and filter the boosted DC voltage and output a first DC voltage to the first H-bridge circuit.

[0008] In one embodiment, the first SPWM wave output circuit includes: a first drive control unit and a first driver connected in sequence; the first drive control unit is used to output a first SPWM wave to the first driver according to the synchronization signal and phase value sent by the processing unit; the first driver is used to drive the first SPWM wave and output the first SPWM wave to the first H-bridge circuit.

[0009] In one embodiment, the voltage output circuit further includes a voltage transformer sampling and measurement circuit, which is connected to the voltage output port. The voltage transformer sampling and measurement circuit is used to step down the AC voltage, convert the stepped-down AC voltage into a first DC signal, and transmit the first DC signal to the processing unit. The processing unit is also used to adjust the duty cycle of the first PWM wave according to the first DC signal.

[0010] In one embodiment, the device further includes an energy storage unit and a current output circuit, comprising: a step-down circuit, a second SPWM wave output circuit, a second H-bridge circuit, and a current output port, wherein the step-down circuit and the second SPWM wave output circuit are both connected to the second H-bridge circuit, and the second H-bridge circuit is connected to the current output port; the step-down circuit is used to step down the DC voltage provided by the energy storage unit based on the second PWM wave sent by the processing unit, and output a second DC voltage to the second H-bridge circuit; the second SPWM wave output circuit is used to output a second SPWM wave to the second H-bridge circuit according to the synchronization signal and phase value sent by the processing unit; the second H-bridge circuit is used to output AC current to the current output port based on the second DC voltage and the second SPWM wave.

[0011] In one embodiment, the second SPWM wave output circuit includes: a second drive control unit and a second driver connected in sequence; the second drive control unit is used to output a second SPWM wave to the second driver according to the synchronization signal and phase value sent by the processing unit; the second driver is used to drive the second SPWM wave and output the second SPWM wave to the second H-bridge circuit.

[0012] In one embodiment, the current output circuit further includes a current transformer sampling and measurement circuit connected to the current output port; the current transformer sampling and measurement circuit is used to convert the AC current into a target AC current smaller than the AC current, convert the target AC current into a second DC signal, and transmit the second DC signal to the processing unit; the processing unit is also used to adjust the duty cycle of the second PWM wave according to the second DC signal.

[0013] In one embodiment, the input unit includes a touch screen display for displaying the energy parameters measured by the energy meter, the energy parameters of the simulated load current and simulated load voltage output by the power supply unit, and the result of whether the energy meter has any leakage current.

[0014] In one embodiment, the device further includes a communication unit for data interaction with an external terminal.

[0015] The beneficial effects of the technical solutions provided in this application include at least the following:

[0016] This application provides a power theft analysis device, which includes an input unit, a processing unit, a power supply unit, and a power meter reading unit. The power supply unit includes three voltage output circuits and three current output circuits. The voltage output circuits output simulated load voltage to the power meter, and the current output circuits output simulated load current to the power meter. The input unit receives configuration information input by the user, wherein the configuration information indicates the power output mode and phase value. The power output mode includes a single-phase output mode or a three-phase output mode. After receiving the configuration information, the processing unit controls the power supply unit to output the simulated load current and the simulated load voltage to the power meter according to the configuration information. After providing the simulated load voltage and simulated load current to the power meter, the power meter reading unit reads the power parameters measured by the power meter. Based on this, the processing unit can determine whether there is power theft by comparing the power parameters measured by the power meter with the power parameters of the simulated load current and simulated load voltage output by the power supply unit. For example, for a single-phase energy meter, the processing unit can control the power supply unit to output a single-phase simulated load current and a single-phase simulated load voltage to the single-phase energy meter. For a three-phase energy meter, the processing unit can control the power supply unit to output a three-phase simulated load current and a three-phase simulated load voltage to the three-phase energy meter. Furthermore, the processing unit can control the phase between the simulated load current and simulated load voltage output by the power supply unit based on the phase between the simulated load current and simulated load voltage input by the user. Therefore, compared with the prior art, the leakage current analysis device in this application embodiment can select the energy output mode according to the form of the energy meter, and can adjust the phase between the simulated load current and simulated load voltage output to the energy meter according to the phase value input by the user. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first type of electricity theft analysis device 10 provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the structure of the second type of electricity theft analysis device 20 provided in the embodiments of this application;

[0019] Figure 3 A schematic diagram of the voltage output circuit provided in an embodiment of this application;

[0020] Figure 4 A schematic diagram of the current output circuit provided in an embodiment of this application;

[0021] Input unit 101;

[0022] Processing unit 102;

[0023] Power supply unit 103;

[0024] Energy meter reading unit 104;

[0025] Voltage output circuit 105;

[0026] Current output circuit 106;

[0027] Energy storage unit 107;

[0028] Communication unit 108;

[0029] Power conversion circuit 109;

[0030] Switching circuit 110;

[0031] DC voltage output circuit 111;

[0032] First SPWM wave output circuit 112;

[0033] First H-bridge circuit 113;

[0034] Voltage output port 114;

[0035] PWM drive circuit 115;

[0036] Boost circuit 116;

[0037] Rectifier and filter circuit 117;

[0038] First drive control unit 118;

[0039] First driver 119;

[0040] Voltage transformer sampling and measurement circuit 120;

[0041] Step-down circuit 121;

[0042] Second SPWM wave output circuit 122;

[0043] Second H-bridge circuit 123;

[0044] Current output port 124;

[0045] Current transformer sampling and measurement circuit 125;

[0046] Second drive control unit 126;

[0047] Second drive 127. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] With the development of the social economy and the increase in electricity consumption, the problem of electricity theft has become increasingly prominent, and the methods of electricity theft are becoming more and more high-tech, causing significant economic losses to power supply companies. Once a power supply company discovers a risk of electricity theft or leakage, it will cut off power to the site and dispatch maintenance personnel to analyze the situation using the on-site electricity meters. These meters include both three-phase and single-phase meters. The analysis of electricity theft and leakage using the on-site meters involves: a electricity theft analysis device providing the electricity meter with simulated load current and voltage, and adjusting the phase between the simulated load voltage and current according to different simulated loads. Based on the electrical parameters measured by the electricity meter and the electrical parameters of the simulated load current and voltage, the analysis of electricity theft and leakage is conducted.

[0050] However, existing leakage current analysis devices can only provide simulated load current and simulated load voltage to one type of energy meter. That is, single-phase leakage current analysis devices can only provide simulated load current and voltage to single-phase energy meters, and three-phase leakage current analysis devices can only provide simulated load current and voltage to three-phase energy meters. Furthermore, existing leakage current analysis devices cannot adjust the phase between simulated load voltage and simulated load current, meaning that existing leakage current analysis devices cannot analyze the leakage current of energy meters in the field under different simulated load types.

[0051] In view of this, embodiments of this application provide a power theft analysis device, which can select the power output mode according to the form of the power meter, and adjust the phase between the simulated load current and the simulated load voltage output to the power meter according to the phase value input by the user.

[0052] Please see Figure 1 This illustrates a schematic diagram of the structure of the first type of leakage current analysis device 10 provided in an embodiment of this application. Figure 1 As shown, the electricity theft and leakage analysis device 10 may include an input unit 101, a processing unit 102, a power supply unit 103, and an electricity meter reading unit 104.

[0053] The input unit 101, power supply unit 103, and energy meter reading unit 104 are all connected to the processing unit 102. The power supply unit 103 includes three voltage output circuits 105 and three current output circuits 106. The voltage output circuits 105 are used to output simulated load voltage to the energy meter, and the current output circuits 106 are used to output simulated load current to the energy meter. Optionally, the three voltage output circuits 105 are independent of each other. When the user selects the three-phase output mode, the processing unit 102 can adjust the output of each phase and control the reference sine waves of each phase to differ by 120 degrees. Similarly, the three current output circuits 106 are independent of each other, and the processing unit 102 controls the phase output and adjusts the phase magnitude. It is important to note that the three voltage output circuits 105 and the three current output circuits 106 are also independent of each other.

[0054] Input unit 101 is used to receive configuration information input by the user. The configuration information indicates the power output mode and phase value. The power output mode includes a single-phase output mode or a three-phase output mode, and the phase value is the phase between the simulated load current and simulated load voltage output by the power supply unit. Optionally, input unit 101 may include a touch screen display. For a single-phase energy meter, the user can select the single-phase output mode through the touch screen display; for a three-phase energy meter, the user can select the three-phase output mode through the touch screen display.

[0055] Optionally, the simulated load may include, but is not limited to, purely resistive loads, purely capacitive loads, purely inductive loads, loads composed of resistors and capacitors, and loads composed of resistors and inductors. Specifically, the current and voltage of a purely resistive load are in phase; the current of a purely capacitive load leads the voltage by 90 degrees; the current of a load composed of resistors and capacitors leads the voltage by 0 to 90 degrees; the current of a purely inductive load lags the voltage by 90 degrees; and the current of a load composed of resistors and inductors lags the voltage by up to 90 degrees. Therefore, the phase between the simulated load voltage and the simulated load current differs depending on the simulated load.

[0056] The processing unit 102 is used to control the power supply unit 103 to output simulated load current and simulated load voltage to the energy meter according to the configuration information. For example, if the configuration information is a single-phase output mode and the phase value is current leading voltage by 90 degrees, then the processing unit 102 outputs single-phase simulated load voltage and current to the energy meter according to the configuration information, and controls the single-phase simulated load current to lead the single-phase simulated load voltage by 90 degrees. Optionally, the phase can be adjusted by different delay control.

[0057] The electricity meter reading unit 104 is used to read the electrical energy parameters measured by the electricity meter. Optionally, the electrical energy parameters measured by the electricity meter include, but are not limited to, the current, voltage, phase between current and voltage, active power, active power factor, total active power, and internal temperature of the electricity meter. Optionally, the electricity meter reading unit 104 may include a verification unit and a meter reading unit. The verification unit may include a photoelectric pulse input / output interface, through which the verification unit can obtain the electrical energy parameters measured by the electricity meter from the electricity meter side. The meter reading unit may include an infrared transceiver interface or a 485 communication interface, through which the meter reading unit can read the electrical energy parameters measured by the electricity meter from the electricity meter side.

[0058] The processing unit 102 is also used to compare the energy parameters measured by the energy meter with the energy parameters of the simulated load current and simulated load voltage output by the power supply unit to determine whether there is any leakage current in the energy meter. Optionally, based on the energy parameters measured by the energy meter and the energy parameters of the simulated load current and simulated load voltage output by the power supply unit, the processing unit 102 can use digital signal processing technology to calculate the energy output by the leakage current analysis device to the energy meter and the actual energy of the energy meter, and then calculate the energy error, that is, the ratio between the difference between the energy output by the leakage current analysis device to the energy meter and the actual energy of the energy meter, and the ratio between the energy output by the leakage current analysis device to the energy meter. If the ratio is 10%, it indicates that the energy meter has leaked 10% of the electricity. To improve the accuracy of electricity theft analysis, the average error of the electricity meter can be calculated, which is the average of the errors of the three most recent electricity meters. If the errors of the three electricity meters are 9%, 10%, and 11%, respectively, then the average error is 10%, indicating that the electricity meter has stolen 10% of the electricity.

[0059] Optionally, the touch screen included in the input unit 101 can display the electrical energy parameters measured by the energy meter, the electrical energy parameters of the simulated load current and simulated load voltage output by the power supply unit, and the result of whether the energy meter has any leakage current. Optionally, the touch screen can include menu-style options, the main features of which are intuitive operation, clear hierarchy, and ease of use.

[0060] In this embodiment, a power theft analysis device 10 is provided. The device includes an input unit 101, a processing unit 102, a power supply unit 103, and a power meter reading unit 104. The power supply unit 103 includes three voltage output circuits 105 and three current output circuits 106. The voltage output circuits 105 output simulated load voltage to the power meter, and the current output circuits 106 output simulated load current to the power meter. The input unit 101 receives configuration information input by the user, whereby the configuration information indicates the power output mode and phase value. The output mode includes single-phase output mode or three-phase output mode. After receiving the configuration information, the processing unit 102 controls the power supply unit 103 to output the simulated load current and the simulated load voltage to the energy meter according to the instructions of the configuration information. After providing the simulated load voltage and simulated load current to the energy meter, the energy parameters measured by the energy meter are read by the energy meter reading unit 104. Based on this, the processing unit 102 can determine whether there is any leakage current in the energy meter by comparing the energy parameters measured by the energy meter with the energy parameters of the simulated load current and simulated load voltage output by the power supply unit 103. For example, for a single-phase energy meter, the processing unit 102 can control the power supply unit 103 to output a single-phase simulated load current and a single-phase simulated load voltage to the single-phase energy meter. For example, for a three-phase energy meter, the processing unit 102 can control the power supply unit 103 to output a three-phase simulated load current and a three-phase simulated load voltage to the three-phase energy meter. Furthermore, the processing unit 102 can control the phase between the simulated load current and simulated load voltage output by the power supply unit 103 according to the phase between the simulated load current and simulated load voltage input by the user. Therefore, compared with the prior art, the leakage current analysis device 10 in this embodiment can select the energy output mode according to the form of the energy meter, and can adjust the phase between the simulated load current and simulated load voltage output to the energy meter according to the phase value input by the user.

[0061] Please see Figure 2 This illustrates a schematic diagram of the structure of the second type of leakage current analysis device 20 provided in an embodiment of this application. Figure 2 As shown, the electricity theft and leakage analysis device 20 includes an input unit 101, a processing unit 102, an electricity meter reading unit 104, a three-channel voltage output circuit 105, a three-channel current output circuit 106, an energy storage unit 107, a communication unit 108, a power conversion circuit 109, and a switching circuit 110.

[0062] The functions of the input unit 101, processing unit 102, energy meter reading unit 104, three-channel voltage output circuit 105, and three-channel current output circuit 106 have been described in the above embodiments and will not be repeated here.

[0063] The energy storage unit 107 is used to power the entire electricity theft analysis device 20. Optionally, the energy storage unit 107 can be a lithium battery, a storage battery, or other power source. This application embodiment does not limit the type of energy storage unit 107. The power conversion circuit 109 is used to convert the DC voltage provided by the energy storage unit 107 into the rated voltage range of each unit in the electricity theft analysis device 20 to ensure the stable operation of each unit. The communication unit 108 is used for data interaction between the electricity theft analysis device 20 and external terminals or servers. Optionally, the communication unit 108 can interact with external terminals or servers via Bluetooth, wireless, or wired means. This application embodiment does not limit the method of data interaction. The switching circuit 110 is used to control the start and stop of the entire electricity theft analysis device 20.

[0064] like Figure 3 As shown, the voltage output circuit 105 includes a DC voltage output circuit 111, a first SPWM wave output circuit 112, a first H-bridge circuit 113, a voltage output port 114, and a voltage transformer sampling and measurement circuit 120. The DC voltage output circuit 111 and the first SPWM wave output circuit 112 are both connected to the first H-bridge circuit 113. The first H-bridge circuit 113 is connected to the voltage output port 114, and the voltage output port 114 is connected to the voltage transformer sampling and measurement circuit 120.

[0065] The system includes a DC voltage output circuit 111, which outputs a first DC voltage to the first H-bridge circuit 113 based on a first PWM wave sent by the processing unit 102; a first SPWM wave output circuit 112, which outputs a first SPWM wave to the first H-bridge circuit 113 based on a synchronization signal and phase value sent by the processing unit 102; optionally, the processing unit 102 can send the phase value via a serial port; the first H-bridge circuit 113 outputs an AC voltage to the voltage output port 114 based on the first DC voltage and the first SPWM wave; and a voltage transformer sampling and measurement circuit 120, which performs step-down processing on the AC voltage, converts the stepped-down AC voltage into a first DC signal, and transmits the first DC signal to the processing unit 102; optionally, the processing unit 102 can also adjust the duty cycle of the first PWM wave based on the first DC signal. Optionally, the processing unit 102 can use an STM32 microcontroller to control and adjust the output first PWM wave, and the processing unit 102 can perform true RMS measurement, which has the advantages of strong anti-interference capability and high measurement accuracy.

[0066] To elaborate further, such as Figure 3As shown, the DC voltage output circuit 111 includes a PWM drive circuit 115, a boost circuit 116, and a rectifier and filter circuit 117 connected in sequence. The PWM drive circuit 115 drives a first PWM wave and transmits it to the boost circuit 116. The boost circuit boosts the DC voltage provided by the energy storage unit 107 based on the first PWM wave. The rectifier and filter circuit 117 rectifies and filters the boosted DC voltage and outputs the first DC voltage to the first H-bridge circuit 113. Optionally, the boost circuit 116 and the rectifier and filter circuit 117 in the three-channel voltage output circuit 105 can stably output first DC voltages of 57V, 100V, and 220V. Optionally, the PWM drive circuit 115 includes a MOSFET, which drives the first PWM wave and outputs it to the boost circuit 116. Optionally, the boost circuit 116 can use an EC2828 transformer (150W high-frequency transformer), which can boost the 12V DC voltage provided by the energy storage unit 107 to 88V, 160V or 360V.

[0067] To elaborate further, such as Figure 3 As shown, the first SPWM wave output circuit 112 includes: a first drive control unit 118 and a first driver 119 connected in sequence; the first drive control unit 118 is used to output a first SPWM wave to the first driver 119 according to the synchronization signal and phase value sent by the processing unit. Optionally, the synchronization signal can be a pulse square wave signal, which can control the H-bridge toggling; the first driver 119 is used to drive the first SPWM wave and output the first SPWM wave to the first H-bridge circuit 113. Optionally, the first drive control unit 118 and the first driver 119 can be driven by a drive MCU and a drive chip, and the drive chip can be an IR2110 driver.

[0068] like Figure 4 As shown, the current output circuit 106 includes: a step-down circuit 121, a second SPWM wave output circuit 122, a second H-bridge circuit 123, a current output port 124, and a current transformer sampling and measurement circuit 125. The step-down circuit 121 and the second SPWM wave output circuit 122 are both connected to the second H-bridge circuit 123. The second H-bridge circuit 123 is connected to the current output port 124, and the current transformer sampling and measurement circuit 125 is connected to the current output port 124.

[0069] The circuit includes a step-down circuit for stepping down the DC voltage provided by the energy storage unit 107 based on the second PWM wave sent by the processing unit 102, and outputting a second DC voltage to the second H-bridge circuit 123; a second SPWM wave output circuit 122 for outputting a second SPWM wave to the second H-bridge circuit 123 based on the synchronization signal and phase value sent by the processing unit 102; a second H-bridge circuit 123 for outputting AC current to the current output port 124 based on the second DC voltage and the second SPWM wave; a current transformer sampling and measurement circuit 125 for converting the AC current into a target AC current smaller than the AC current, converting the target AC current into a second DC signal, and transmitting the second DC signal to the processing unit 102; and furthermore, the processing unit 102 is used to adjust the duty cycle of the second PWM wave according to the second DC signal.

[0070] Furthermore, such as Figure 4 As shown, the second SPWM wave output circuit 122 includes a second drive control unit 126 and a second driver 127 connected in sequence. The second drive control unit 126 outputs a second SPWM wave to the second driver 127 based on a synchronization signal and phase value sent by the processing unit 102. Optionally, the synchronization signal can be a pulse square wave signal, which can control the H-bridge toggling. The processing unit 102 can send the phase value via a serial port. The second driver 127 drives the second SPWM wave and outputs it to the second H-bridge circuit 123.

[0071] The electricity theft and leakage analysis device 20 in this embodiment can be directly installed at the inlet of the electricity meter. It is simple to operate, compatible with various types of electricity meters under energized conditions, and can perform on-site electricity theft and leakage verification and analysis even during power outages. Simultaneously, it enables high- and low-voltage isolation. Through data interaction with external terminals, various electrical parameters can be saved and shared, allowing for quantitative analysis and evidence collection of electricity theft and leakage on-site. This improves the on-site management level of smart electricity meters and promotes the implementation of on-site electricity theft and leakage prevention measures.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A device for analyzing electricity theft and leakage, characterized in that, The device includes an input unit, a processing unit, a power supply unit, and an energy meter reading unit. The power supply unit includes three voltage output circuits and three current output circuits. The three voltage output circuits are used to output simulated load voltage to the energy meter, and the three current output circuits are used to output simulated load current to the energy meter. The three voltage output circuits are independent of each other, the three current output circuits are independent of each other, and the three voltage output circuits and the three current output circuits are independent of each other. The input unit is used to receive configuration information input by the user. The configuration information is used to indicate the power output mode and the phase value. The power output mode includes a single-phase output mode and a three-phase output mode. The phase value is the phase between the simulated load current and the simulated load voltage output by the power supply unit. The processing unit is used to control the power supply unit to output the simulated load current and the simulated load voltage to the energy meter according to the instructions of the configuration information; The electricity meter reading unit is used to read the electrical energy parameters measured by the electricity meter; The processing unit is also used to compare the energy parameters measured by the energy meter with the energy parameters of the simulated load current and simulated load voltage output by the power supply unit to determine whether there is any leakage of electricity in the energy meter. The three-way voltage output circuit includes: a DC voltage output circuit, a first SPWM wave output circuit, a first H-bridge circuit, and a voltage output port. The DC voltage output circuit and the first SPWM wave output circuit are both connected to the first H-bridge circuit, and the first H-bridge circuit is connected to the voltage output port. The DC voltage output circuit is used to output a first DC voltage to the first H-bridge circuit according to the first PWM wave sent by the processing unit. The first SPWM wave output circuit is used to output a first SPWM wave to the first H-bridge circuit according to the synchronization signal sent by the processing unit and the phase value. The first H-bridge circuit is used to output AC voltage to the voltage output port based on the first DC voltage and the first SPWM wave; The three-way voltage output circuit also includes a voltage transformer sampling and measurement circuit, which is connected to the voltage output port. The voltage transformer sampling and measurement circuit is used to step down the AC voltage, convert the stepped-down AC voltage into a first DC signal, and transmit the first DC signal to the processing unit; the processing unit is also used to adjust the duty cycle of the first PWM wave according to the first DC signal. The device further includes an energy storage unit. The three-channel current output circuit includes: a step-down circuit, a second SPWM wave output circuit, a second H-bridge circuit, and a current output port. The step-down circuit and the second SPWM wave output circuit are both connected to the second H-bridge circuit, which is connected to the current output port. The step-down circuit is used to step down the DC voltage provided by the energy storage unit based on the second PWM wave sent by the processing unit and output a second DC voltage to the second H-bridge circuit. The second SPWM wave output circuit is used to output a second SPWM wave to the second H-bridge circuit based on the synchronization signal sent by the processing unit and the phase value. The second H-bridge circuit is used to output AC current to the current output port based on the second DC voltage and the second SPWM wave. The three-channel current output circuit further includes a current transformer sampling and measurement circuit, which is connected to the current output port. The current transformer sampling and measurement circuit is used to convert the AC current into a target AC current smaller than the AC current, convert the target AC current into a second DC signal, and transmit the second DC signal to the processing unit. The processing unit is also used to adjust the duty cycle of the second PWM wave according to the second DC signal. The first SPWM wave output circuit includes: a first drive control unit and a first driver connected in sequence; The first drive control unit is configured to output the first SPWM wave to the first driver based on the synchronization signal sent by the processing unit and the phase value; The first driver is used to drive the first SPWM wave and output the first SPWM wave to the first H-bridge circuit; The processing unit is specifically used to adjust the phase between the analog load voltage and the analog load current of different types of analog loads based on different delay control methods. The different types of analog loads include purely resistive loads, purely capacitive loads, purely inductive loads, loads composed of a resistor and an inductor, and loads composed of a resistor and a capacitor.

2. The apparatus according to claim 1, characterized in that, The device also includes an energy storage unit, which is used to provide power to the power theft analysis device. The DC voltage output circuit includes a PWM drive circuit, a boost circuit and a rectifier filter circuit connected in sequence. The PWM driving circuit is used to drive the first PWM wave and transmit it to the boost circuit. The boost circuit is used to boost the DC voltage provided by the energy storage unit based on the first PWM wave. The rectifier and filter circuit is used to rectify and filter the boosted DC voltage and output a first DC voltage to the first H-bridge circuit.

3. The apparatus according to claim 1, characterized in that, The second SPWM wave output circuit includes: a second drive control unit and a second driver connected in sequence; The second drive control unit is configured to output the second SPWM wave to the second driver based on the synchronization signal sent by the processing unit and the phase value. The second driver is used to drive the second SPWM wave and output the second SPWM wave to the second H-bridge circuit.

4. The apparatus according to claim 1, characterized in that, The input unit includes a touch screen, which is used to display the energy parameters measured by the energy meter, the energy parameters of the simulated load current and simulated load voltage output by the power supply unit, and the result of whether the energy meter has any leakage or theft.

5. The apparatus according to claim 1, characterized in that, The device also includes a communication unit for data interaction with an external terminal.

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