CN107607760B - Electric energy metering anti-theft system and method thereof - Google Patents
Electric energy metering anti-theft system and method thereof Download PDFInfo
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- CN107607760B CN107607760B CN201710931152.7A CN201710931152A CN107607760B CN 107607760 B CN107607760 B CN 107607760B CN 201710931152 A CN201710931152 A CN 201710931152A CN 107607760 B CN107607760 B CN 107607760B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 44
- 230000005611 electricity Effects 0.000 claims abstract description 23
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses an electric energy metering electricity larceny prevention system and an electric energy metering electricity larceny prevention method, wherein a voltage sampling circuit, a live wire current sampling circuit and a zero line current sampling circuit are utilized to collect voltage and current signals of a mains supply and transmit the voltage and current signals to an MCU; when the mains supply is used for supplying power, the mains supply is directly used for supplying power to an MCU with a metering module function, the MCU monitors the working state and capacity of a rechargeable battery, when the power supply voltage is lost at the input power side of the MCU, a power supply switching circuit uses the rechargeable battery for supplying power to the MCU, after the power consumption of the rechargeable battery is finished, a backup battery is used for supplying power to the MCU, the MCU turns off the built-in metering module, the MCU wakes up the built-in metering module every t seconds, if both the live wire current and the zero line current are smaller than 0.1A, the metering module is continuously turned off, and if one current is larger than 0.1A, the apparent power is calculated according to the current with a large sampling value, and the metering function module is turned off. The sampling frequency is fast, the sampling precision is high, and the requirement of the metering precision of 0.5 level can be completely met.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering electricity larceny prevention system and an electric energy metering electricity larceny prevention method.
Background
With the increase of power consumption demand and the release of the national electricity selling market, driven by economic benefits, the electricity stealing means are more and more changeable and hidden, because the current intelligent electric energy meter can monitor the action of opening the meter cover, the means for stealing electricity outside the meter are more and more, and the disconnection of a zero line or a live wire leads the electric energy meter not to work normally is a new electricity stealing mode, the common practice of solving the electricity stealing mode is to increase a power CT and a power conversion circuit, the current sensed by the power CT supplies power to a metering chip and a management MCU through the power conversion circuit, such as an authorized bulletin number CN 103592483B, a system and a method thereof for realizing metering after the zero line or the phase line of the electric energy meter is dropped off are disclosed, the electronic electric energy meter comprises a power supply unit, a voltage dividing circuit, a current transformer and a metering module MCU, signal acquisition ends of the power supply unit, the voltage dividing circuit, the current transformer and the zero line current transformer are all connected with a phase line L and a phase line N of an urban power supply, signal output end of the signal conversion circuit is connected with a corresponding signal input end of the metering module MCU, and a signal input end of the signal conversion circuit is connected with a signal input end of the power conversion circuit of the MCU, and the signal conversion circuit is connected with the signal input end of the signal conversion circuit of the power conversion circuit. When the invention is used, the purpose of effective metering can be achieved no matter the size of the power load after the electric energy meter is removed of voltage by a user.
However, this method has the following disadvantages:
The CT induction and power conversion circuit takes the electricity from the mains supply grid, so that the line loss of the mains supply is brought, and the energy is not saved; the CT sensing and power conversion circuit has high cost and is uneconomical.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provide an electric energy metering electricity larceny prevention system and an electric energy metering electricity larceny prevention method for reducing power consumption.
In order to solve the defects in the prior art, the invention adopts the following technical scheme: the utility model provides an electric energy measurement anti-electricity-theft system includes voltage sampling circuit, live wire current sampling circuit, zero line current sampling circuit, MCU and low-power consumption power management circuit that have the measurement module function, voltage sampling circuit, live wire current sampling circuit, zero line current sampling circuit all connect commercial power and MCU that have the measurement module function, low-power consumption power management circuit includes backup battery BT2, rechargeable battery BT1, commercial power supply circuit and power switching unit, backup battery BT2, rechargeable battery BT2 and commercial power supply circuit all link to each other with MCU that has the measurement module function for it supplies power, power switching unit is used for switching the break-make of rechargeable battery BT1 and backup battery BT2 and is used for selecting the power supply of MCU that has the measurement module function.
Further, the low-power consumption power management circuit further comprises a diode D1, a diode D2, a diode D3, a triode V1 and a triode V2, wherein the positive electrode of the diode D1 is connected with a mains supply, the negative electrode of the diode D1 is connected with a power management unit and a rechargeable battery BT1, the positive electrode of the diode D2 is connected with the mains supply, the negative electrode of the diode D2 is connected with the power management unit and a backup battery BT2, the rechargeable battery BT1 and the backup battery BT2 are connected with the power management unit, the positive electrode of the diode D3 is connected with the mains supply, the negative electrode of the diode D3 is connected with the emitting electrode of the triode V1, the collector output current of the triode V1 supplies power to an MCU with a metering module function, the emitting electrode of the triode V2 is connected with the rechargeable battery BT1 and the backup battery BT2, the base electrode of the triode is connected with the power management unit, and the collector output current supplies power to the MCU with the metering module function.
Further, the MCU with the metering module function is of the model HT5019.
An electric energy metering electricity larceny prevention method comprises the following steps:
the voltage and current signals of the mains supply are collected by the voltage sampling circuit, the live wire current sampling circuit and the zero line current sampling circuit and transmitted to the MCU, and a metering module is arranged in the MCU;
When the mains supply is used for supplying power, the mains supply is directly used for supplying power to the MCU with the metering module function, the MCU monitors the working state and capacity of the rechargeable battery, and the rechargeable battery is charged when the rechargeable battery is in an idle state and the capacity is insufficient;
When the power supply voltage is lost at the MCU input power supply side, the MCU turns off the built-in metering module, the Hold mode is entered, the MCU wakes up the built-in metering module every time T, the live wire current sampling circuit and the zero line current sampling circuit are turned on to respectively collect the live wire current and the zero line current, the collection time lasts for 200ms, if the live wire current and the zero line current are smaller than 0.1A, the metering module is continuously turned off, if one current is larger than 0.1A, the apparent power is calculated according to the current with large sampling value, the calculated value is written into the constant active power register, after the writing is finished, the metering function module is turned off, the MCU continuously enters the Hold mode, and at the moment, the MCU always uses the constant power to accumulate the firing pulses and accumulate the electric energy, namely, the MCU is in the constant mode for metering, and works in the Hold mode.
When the power voltage is lost at the MCU input power side, a control power supply switching circuit of the MCU with a metering module function uses a rechargeable battery to supply power to the MCU, and when the power consumption of the rechargeable battery is finished, a backup battery is used to supply power to the MCU.
Further, the time interval T is 5 seconds, and the operating frequency of the metering module is 900kHz.
According to the technical scheme, the invention has the advantages that by using the low-power consumption MCU and the double-battery mode with monitoring management, when no electricity larceny exists, the MCU is in the STOP mode, the power consumption of the whole machine is only 10uA, when the electricity larceny exists, the problem that the battery is consumed after the electricity larceny state is entered for a long time is effectively solved by using one rechargeable battery and one backup battery due to the fact that the monitoring current is needed for metering, and the rechargeable battery is preferentially used, the problem that the power consumption of the backup battery is invalid is effectively avoided, meanwhile, the sampling frequency is high when the current measurement is started, the sampling precision is high, and the requirement of the metering precision of 0.5s level can be completely met.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a workflow diagram of the present invention;
FIG. 3 is a diagram illustrating a low power consumption power management circuit according to the present invention.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings.
The invention relates to an electric energy metering electricity larceny prevention system, which comprises a voltage sampling circuit, a live wire current sampling circuit, a zero line current sampling circuit, an MCU with a metering module function and a low-power consumption power supply management circuit, wherein the voltage sampling circuit, the live wire current sampling circuit and the zero line current sampling circuit are all connected with a mains supply and the MCU with the metering module function, the low-power consumption power supply management circuit comprises a backup battery, a rechargeable battery, a charging circuit, a mains supply circuit and a power supply switching circuit, the backup battery, the rechargeable battery and the mains supply are all connected with the MCU with the metering module function, the charging circuit is connected with the rechargeable battery, and the power supply switching circuit is used for switching on-off of the charging circuit and the rechargeable battery and selecting a power supply of the MCU with the metering module function.
The low-power consumption power management circuit further comprises a diode D1, a diode D2, a diode D3, a triode V1 and a triode V2, wherein the power management unit is a built-in single chip microcomputer system, the anode of the diode D1 is connected with a mains supply, the cathode of the diode D1 is connected with the power management unit and a rechargeable battery BT1, the anode of the diode D2 is connected with the mains supply, the cathode of the diode D2 is connected with the power management unit and a backup battery BT2, the rechargeable battery BT1 and the backup battery BT2 are connected with the power management unit, the anode of the diode D3 is connected with the mains supply, the cathode of the diode D3 is connected with the emitter of the triode V1, the collector output current of the triode V1 supplies power to an MCU with a metering module function, the emitter of the triode V2 is connected with the rechargeable battery BT1 and the backup battery BT2, the base of the triode is connected with the power management unit, and the collector output current supplies power to the MCU with the metering module function. When VCC has voltage, VCC charges rechargeable battery BT1, and the power management unit controls triode V1 to supply VCPU with the voltage of VCC at this moment, and when VCC is out of voltage, the power management chip is through comparing BT1 and BT 2's voltage, and when BT1 is higher than BT2, the power management unit is through controlling triode V2, and when BT2 is higher than BT1, the power management unit is through controlling triode V2, and the voltage of BT2 is supplied to VCPU.
MCU with metering module function adopts HT5019 of saw photoelectric technology (Shanghai) Co., ltd, and this MCU is from taking metering module, and the chip totally has 5 kinds of modes: the difference between the normal mode, the debugging mode, the test mode, the Sleep mode, the Hold mode and the Sleep mode is that in the Hold mode, the LDO_1P5 and the LDO_ LowPower are switched by a user control, and the digital LDO_ LowPower is always powered on, but because of the low output driving capability (20-30 uA), a plurality of digital functional modules cannot be enabled in the state, and the user can configure the LDO_1P5 for starting the high-power consumption and the high-output driving capability to adapt to the application requirements. In order to reduce power consumption in Hold mode, the bordet module is turned on by the chip hardware in a time-sharing manner. If the system is configured with interrupt enable before entering the Hold mode, and a corresponding interrupt event occurs after entering the Hold mode, the chip is caused to wake up from the Hold mode and enter a corresponding interrupt processing program.
The power consumption in Hold mode is only 3.7uA. The metering module can work in three modes of normal, low frequency and constant, and the power consumption is only increased by about 10uA in the constant mode.
Operating voltage range: 2.2V-5.5V
Working temperature range: -45-85 DEG C
ARM Cortex-M0CPU Core, 128K Flash+512bytes Information Block and 8K SRAM are adopted
High speed: insertion wait CPU maximum working frequency 39.32MHz
No-wait CPU highest working frequency 19.66MHz
Low power consumption: minimum power consumption 3.7uA in Hold mode
Minimum power consumption 2.9uA in Sleep mode
RTC compensation: RTC built-in curve digital compensation, and full temperature range RTC compensation does not need user software to participate
RTC: the external 32K low-frequency crystal integrates the resistor and the capacitor required by the crystal.
Auxiliary RTC: when the external OSC crystal oscillator stops vibrating, the system can be switched to the internal low-frequency RC to obtain the timing time
LCD: LCD display supporting 4COM,6COM and 8COM, and SEG interface supporting 43 segments at most
The power supply mode is as follows: internal switching of power supplies, and external VSYS and VBAT power supplies respectively
High-precision temperature sensor: in the temperature range of-45 degrees to +85 degrees, the consistency of the temperature sensor is better than that of positive and negative 1 degree
2-Way hardware 7816 function
In a normal mode, the WDT module cannot be closed, so that the reliable operation of the system is ensured
Built-in hardware AES/GHASH encryption/decryption algorithm
Built-in DMA function
Built-in key scanning function, which supports four kinds of 1,2, 4,3, 4 and 4
Support I2C, SPI, TIMER CC & PWM
And a metering module: dynamic range 5000:1, supporting active, reactive, apparent, effective value, frequency and other metering parameters, zero line/live wire anti-electricity-theft metering, single-phase three-line and open-phase anti-electricity-theft metering modes, wherein the continuous metering power consumption is better than 650uA, and direct current metering is supported
When the commercial power is supplied, a commercial power supply unit in the low-power consumption power management system supplies power to the MCU with the metering module function; and the MCU monitoring management unit with the metering module function turns on a switch in the power management circuit to charge the rechargeable battery according to the fact that the rechargeable battery is in an idle state and the capacity is insufficient, until the capacity is full (the process is in real-time monitoring and cyclic charging due to the fact that the battery has self-loss).
As shown in FIG. 2, the electric energy metering electricity larceny prevention method of the invention
The voltage and current signals of the mains supply are collected by the voltage sampling circuit, the live wire current sampling circuit and the zero line current sampling circuit and transmitted to the MCU, and a metering module is arranged in the MCU;
When the mains supply is used for supplying power, the mains supply is directly used for supplying power to the MCU with the metering module function, the MCU monitors the working state and capacity of the rechargeable battery, and the rechargeable battery is charged when the rechargeable battery is in an idle state and the capacity is insufficient;
When the power supply voltage is lost at the MCU input power supply side, the MCU turns off the built-in metering module, enters the Hold mode, wakes up the built-in metering module every time T, the working frequency of the metering module is 900kHz, the live wire current and the zero line current are respectively collected by the live wire current collecting circuit and the zero line current sampling circuit, the collection time lasts for 200ms, if both the live wire current and the zero line current are smaller than 0.1A, the metering module is continuously turned off, and if one current is larger than 0.1A, the apparent power is calculated according to the current with large sampling value: and I, UCONST, writing a calculated value into a constant active power register, closing a metering functional module after writing, and enabling the MCU to continuously enter a Hold mode, wherein the MCU always uses the constant power to accumulate and pulse and accumulate electric energy, namely, the MCU meters in the constant mode and works in the Hold mode.
When the power voltage is lost at the MCU input power side, a control power supply switching circuit of the MCU with a metering module function uses a rechargeable battery to supply power to the MCU, and when the power consumption of the rechargeable battery is finished, a backup battery is used to supply power to the MCU.
Through using rectangular spring's low-power consumption MCU and taking the double battery mode of control management, when there is not stealing electricity, MCU is in STOP mode, the complete machine consumption at this moment only has 10uA, when there is stealing electricity, because need monitor current to measure, complete machine consumption calculates (0.2/5) x920+ (4.8/5) x15 = 51uA this moment, use a 1800mAh rechargeable battery and a 1200mAh backup battery, can use more than 6 years continuously, the effectual problem of battery consumption after getting into the steal electric state for a long time has been overcome, and rechargeable battery is used preferentially, effectively avoid backup battery power consumption inefficacy problem, simultaneously because when opening the electric current measurement, sampling frequency is fast, sampling accuracy is high, can satisfy the requirement of measurement accuracy 0.5 level completely.
Claims (2)
1. The utility model provides an electric energy measurement anti-electricity-theft system, includes voltage sampling circuit, live wire current sampling circuit, zero line current sampling circuit, has MCU and the low-power consumption power management circuit of measurement module function, voltage sampling circuit, live wire current sampling circuit, zero line current sampling circuit all connect the commercial power and have MCU of measurement module function, its characterized in that: the low-power consumption power management circuit comprises a backup battery BT2, a rechargeable battery BT1, a mains supply circuit and a power supply switching unit, wherein the backup battery BT2, the rechargeable battery BT1 and the mains supply circuit are connected with an MCU with a metering module function to supply power to the MCU, and the power supply switching unit is used for switching on and off of the rechargeable battery BT1 and the backup battery BT2 and selecting a power supply of the MCU with the metering module function;
The low-power consumption power management circuit further comprises a diode D1, a diode D2, a diode D3, a triode V1 and a triode V2, wherein the positive electrode of the diode D1 is connected with a mains supply, the negative electrode of the diode D1 is connected with a power supply switching unit and a rechargeable battery BT1, the positive electrode of the diode D2 is connected with the mains supply, the negative electrode of the diode D2 is connected with the power supply switching unit and a backup battery BT2, the rechargeable battery BT1 and the backup battery BT2 are connected with the power supply switching unit, the positive electrode of the diode D3 is connected with the mains supply, the negative electrode of the diode D3 is connected with the emitting electrode of the triode V1, the collector output current of the triode V1 supplies power to an MCU with a metering module function, the emitting electrode of the triode V2 is connected with the rechargeable battery BT1 and the backup battery BT2, the base electrode of the triode V2 is connected with the power supply switching unit, and the collector output current supplies power to the MCU with the metering module function;
When the commercial power is supplied, a commercial power supply unit in the low-power consumption power management system supplies power to the MCU with the metering module function; the MCU monitoring management unit with the metering module function turns on a switch in the power management circuit to charge the rechargeable battery until the capacity is full according to the fact that the rechargeable battery is in an idle state and the capacity is insufficient;
The MCU with the metering module function is of the model HT5019;
An electric energy metering electricity larceny prevention method adopting the electric energy metering electricity larceny prevention system comprises the following steps:
The voltage and current signals of the mains supply are collected by the voltage sampling circuit, the live wire current sampling circuit and the zero line current sampling circuit and transmitted to the MCU, and a metering module is arranged in the MCU;
When the mains supply is used for supplying power, the mains supply is directly used for supplying power to the MCU with the metering module function, the MCU monitors the working state and capacity of the rechargeable battery, and the rechargeable battery is charged when the rechargeable battery is in an idle state and the capacity is insufficient;
when the power supply voltage is lost at the MCU input power supply side, the MCU turns off the built-in metering module, enters a Hold mode, the MCU wakes up the built-in metering module every time T, the live wire current is started, the live wire current and the zero line current are respectively collected by a circuit and a zero line current sampling circuit, the collection time lasts for 200ms, if the live wire current and the zero line current are both smaller than 0.1A, the metering module is continuously turned off, if one current is larger than 0.1A, the apparent power is calculated according to the current with a large sampling value, the calculated value is written into a constant active power register, after the writing is finished, the metering function module is turned off, the MCU continuously enters the Hold mode, and the MCU always uses the constant active power to accumulate and pulse and accumulate electric energy at the moment, namely, the MCU measures in the constant mode and works in the Hold mode;
When VCC has voltage, VCC charges rechargeable battery BT1, and the power switching unit controls triode V1 at this moment, and the voltage of VCC supplies VCPU, and when VCC is out of voltage, power management chip is through comparing rechargeable battery BT1 and backup battery BT 2's voltage, and when rechargeable battery BT 1's voltage was higher than backup battery BT 2's voltage, the power switching unit supplied VCPU with rechargeable battery BT 1's voltage through controlling triode V2, and when backup battery BT 2's voltage was higher than rechargeable battery BT 1's voltage, the power switching unit supplied VCPU with backup battery BT 2's voltage through controlling triode V2.
2. The method for measuring electric energy and preventing fraudulent use of electricity according to claim 1, wherein: the time interval T is 5 seconds, and the working frequency of the metering module is 900kHz.
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| CN201710931152.7A CN107607760B (en) | 2017-10-09 | 2017-10-09 | Electric energy metering anti-theft system and method thereof |
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| CN109470278B (en) * | 2018-09-18 | 2022-03-04 | 中国电力科学研究院有限公司 | Method and system for determining increment of accumulated metering value of metering equipment to be in zero-increment state |
| CN110082577B (en) * | 2019-04-18 | 2022-06-21 | 中国电力科学研究院有限公司 | Diagnosis method and system for judging electricity stealing behavior of electricity saver |
| CN110988420A (en) * | 2019-12-02 | 2020-04-10 | 深圳供电局有限公司 | Anti-electricity-theft system and anti-electricity-theft control method |
| CN110865313A (en) * | 2019-12-20 | 2020-03-06 | 河南省计量科学研究院 | Charging station electric leakage monitoring system |
| CN114113732B (en) * | 2021-12-15 | 2023-02-28 | 杭州万高科技股份有限公司 | Single-phase electric energy metering chip meeting anti-electricity-theft application of zero-line-dropping |
| CN114325085B (en) * | 2021-12-30 | 2024-07-05 | 江苏林洋能源股份有限公司 | Electric energy meter and method supporting dynamic energy consumption management |
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