CN111983521A - Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof - Google Patents

Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof Download PDF

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Publication number
CN111983521A
CN111983521A CN202010504278.8A CN202010504278A CN111983521A CN 111983521 A CN111983521 A CN 111983521A CN 202010504278 A CN202010504278 A CN 202010504278A CN 111983521 A CN111983521 A CN 111983521A
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phase
current
wiring
voltage
wrong
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Inventor
俞胜
李天阳
王太平
左勇
马波
杨黄河
朱若兰
潘植鑫
陈晓虎
刘洁
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Anhui Nanrui Zhongtian Electric Power Electronics Co ltd
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Anhui Nanrui Zhongtian Electric Power Electronics Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/55—Testing for incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/24—Arrangements for avoiding or indicating fraudulent use
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509—Details concerning sampling, digitizing or waveform capturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/061—Details of electronic electricity meters
    • G01R22/066—Arrangements for avoiding or indicating fraudulent use
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses an electric energy meter with functions of automatic identification of wrong wiring and correct metering and a method thereof. The electric energy meter comprises an acquisition module, a metering module, an MCU main control module and an automatic error correction module. The acquisition module acquires three-phase voltage values, phase angles, three-phase current values and phase angles of the electric energy meter, and the metering module forms a corresponding vector diagram. And the MCU main control module judges whether a wiring error exists, if so, a preset vector legend which is the same as the vector diagram exists in the wrong wiring database, if so, a wiring error type corresponding to the vector diagram is obtained, and a correction instruction is issued according to the wiring error type. And the automatic error correction module judges the wrong wiring as a certain wrong wiring measurement according to the correction instruction, and simultaneously measures and stores the possible correct measurement. The invention has the advantages of automatically detecting and correcting wiring errors and storing correct metering in the meter for standby, overcomes the defect of performing electric quantity compensation calculation after the operation, and achieves the purpose of ensuring the accurate metering of the electric quantity in real time.

Description

Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof
Technical Field
The invention relates to an electric energy meter in the technical field of intelligent electric energy meter metering, in particular to an electric energy meter with functions of automatic identification of wrong wiring and correct metering, and further relates to an electric energy meter control method with functions of automatic identification of wrong wiring and correct metering.
Background
The three-phase intelligent electric energy meter is widely applied to civil use and industrial use, and is used as an electric energy meter for electric energy trade settlement, whether the electric energy meter can be correctly measured or not is related to the benefits of both parties of the electric energy settlement. Factors influencing whether the electric energy meter is correctly metered include the accuracy grade of the electric energy meter and whether the wiring of the electric energy meter is correct. At present, the accuracy grade of an electric energy meter used is high, the influence of electric energy metering errors is less, but errors caused by wrong wiring to electric energy metering are often large, and the situation of wrong wiring is possible to occur in the wiring installation process of a three-phase electric energy meter. However, when a wiring error occurs, a very large electric energy loss is inevitably caused, and it is very difficult to supplement electric quantity, the loss of an enterprise is gradually increased, and finally, the loss of an electric power result is caused. Therefore, the intelligent electric energy meter needs to be ensured not to have the metering misalignment problem caused by wiring errors in operation.
Disclosure of Invention
The invention provides an electric energy meter with functions of automatic identification of wrong wiring and correct metering and a method thereof, aiming at solving the technical problems that the electric energy loss is caused by wrong wiring of the existing electric energy meter and correct electric quantity cannot be obtained.
The invention is realized by adopting the following technical scheme: an electric energy meter with functions of automatic identification of wrong wiring and correct metering comprises the following components:
the acquisition module comprises a three-phase voltage acquisition unit and a three-phase current acquisition unit; the three-phase voltage acquisition unit is used for acquiring a three-phase voltage value and a three-phase voltage phase angle of the electric energy meter, and the three-phase current acquisition unit is used for acquiring a three-phase current value and a three-phase current phase angle of the electric energy meter;
the metering module is used for judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle and obtaining a corresponding vector diagram;
the MCU main control module is used for comparing the vector diagram with a preset correct vector diagram and the power included angle relationship thereof to obtain the most kinds of numbers of possible correct metering combinations, then performing integral metering on all the possible correct metering combinations to generate a plurality of electric quantity values, and finally selecting the only correct electric quantity from the plurality of electric quantity values according to the property of the current metering point input from the outside and judging whether a wiring error exists or not; wherein, the property of the current metering point is one of a power supply and a load, and is also one of a capacitive load and an inductive load; if the wiring is wrong, the MCU main control module searches whether a preset vector legend which is the same as the vector diagram exists in a preset wrong wiring database; when the preset vector legend exists in the wrong wiring database, the MCU main control module acquires a wiring error type corresponding to the vector legend and issues a correction instruction for correcting the wiring error according to the wiring error type; if no wiring error exists, the MCU main control module judges that the wiring of the electric energy meter is correct; and
the automatic error correction module comprises an error correction unit and a reverse error correction unit; the automatic error correction module judges whether the wrong wiring condition is wrong phase or reverse according to the correction instruction; when the wrong wiring condition is wrong, the wrong wiring correction unit corrects the wrong wiring according to the correction instruction and simultaneously measures and stores possible correct measurement; if the wrong wiring condition is reverse, the reverse error correction unit corrects the reverse wiring according to the correction instruction; the MCU main control module is also used for correcting all possible correct metering wires and metering simultaneously for the wrong wires through logic derivation of the vector diagram and the wrong wire connection database according to automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing electric quantity compensation according to the difference between the correct electric quantity and the wrong electric quantity.
The invention collects the three-phase voltage and current information of the electric energy meter by the three-phase voltage collecting unit and the three-phase current collecting unit of the collecting module, and the metering module obtains the vector diagram according to the three-phase voltage and current information, so that the MCU main control module can judge whether wiring errors exist according to the vector diagram, if the wiring errors exist, the corresponding wiring error type is found in the wrong wiring database, and a corresponding correction instruction is sent to the automatic error correction module, so that the automatic error correction module can correct the wrong wiring by the wrong phase error correction unit and the reverse error correction unit according to the wiring error type, and simultaneously the MCU main control module calculates the compensation electric quantity according to the wiring automatic error correction change time and the wrong wiring state, thereby obtaining the final correct electric quantity information, the requirement of manual installation technology is reduced, the electricity stealing caused by manual wiring errors can be prevented, and meanwhile, the error alarm caused by correct wiring is avoided, the technical problems that the electric energy is lost due to wiring errors and correct electric quantity cannot be obtained in the conventional electric energy meter are solved, and the technical effects of automatically detecting and correcting the wiring errors and accurately supplementing the electric quantity are achieved.
As a further improvement of the above scheme, the electric energy meter further includes:
a communication module; the MCU master control module issues the correction instruction to the automatic error correction module through the communication module, and also performs communication data interaction with an electric quantity metering management system through the communication module.
Further, the metering module comprises a power metering unit and an electric energy metering unit; the power metering unit is used for calculating the power under the current wiring condition, and the electric energy metering unit is used for calculating the electric quantity of the electric energy under the current wiring condition.
Furthermore, the input end of the phase error correction unit is used for receiving phase-A current, phase-B current, phase-C current, phase-A voltage, phase-B voltage and phase-C voltage, and the output end of the phase error correction unit is electrically connected with the power metering unit; the phase error correction unit is also electrically connected with the communication module and corrects phase error wiring according to the correction instruction received by the communication module;
the input end of the reverse error correction unit is electrically connected with the active power output end and the reactive power output end of the power metering unit, and the output end of the reverse error correction unit is electrically connected with the input end of the electric energy metering unit; the reverse error correction unit is electrically connected with the communication module and corrects reverse wiring according to the correction instruction received by the communication module.
As a further improvement of the above scheme, the wrong wiring database is provided with two systems of a three-phase three-wire system and a three-phase four-wire system; wherein the content of the first and second substances,
in the three-phase three-wire system, the wiring types in the wrong wiring database are provided with 48 full wiring conditions and 9 other conditions; each full-wiring condition is determined by a voltage phase sequence, a current phase sequence and a current polarity; 6 voltage phase sequences in 48 full-wiring conditions are respectively a correct phase sequence UaUbUc, a wrong phase sequence UbUcUa and UcUaUb, a reverse phase sequence UaUcUb, UbUaUc and UcUbUa, 2 current phase sequence types are respectively a normal current phase sequence IaIC and an error current phase sequence IcIa, and 4 current polarities are respectively correct current polarity Ia + Ic +, error current polarity Ia + Ic-, Ia-Ic-and Ia-Ic +; the correct wiring condition of the 48 full wiring conditions is only one, and the rest wiring conditions are wrong wiring, wherein the voltage channel is connected with UaUbUc and the current channel is connected with Ia + Ic +; the 9 other cases include 3 channel voltage vector deletions, 3 channel voltage polarities being the same, and 3 channel current vector deletions;
in a three-phase four-wire system, the wiring types in the wrong wiring database are set to 2 first-type wiring conditions, 1152 second-type wiring conditions and 17 third-type other conditions; the first type of connection condition is 2 connection modes of voltage connection UbUcUaUn and current connection + Ib + Ic + Ia, voltage connection UcUaUbUn and current connection + Ic + Ia + Ib; each second type of wiring condition is determined by the combination of voltage phase sequence, current phase sequence and current polarity; in 1152 second kind of wiring cases, 24 kinds of voltage phase sequences are positive voltage phase sequences UaUbUcUn, UbUcUaUn, UcUaUbUn, negative voltage phase sequences UaUcUbUn, UbUaUcUn, UcUbUaUn and 18 kinds of live wires are staggered to zero line, 6 kinds of current phase sequences are positive current phase sequences IaIbic, IbIcIa, IcIaIb and negative current phase sequences IbIaIC, IbIa and IaIb, 8 kinds of current polarities are + i1+ i2+ i3, -i1-i2-i3, -i1+ i2+ i3, + 1-i2-i3, + i1-i2+ i3, -i 36 1-36 12, -i + 38i + 2+ i1-i 468 + i 48 + i 2; the 17 third other cases are 6 voltage channel vector anomalies, 7 current channel vector anomalies, and 4 voltage polarity identity, respectively.
Further, in the three-phase three-wire system, the MCU main control module judges whether a channel voltage vector is missing or not according to the effective value of fundamental wave voltage, judges whether a channel current vector is missing or not according to the effective value of fundamental wave current, judges a voltage phase sequence according to a phase angle between voltages, judges a current phase sequence according to a phase angle between currents, judges the type of current polarity according to a phase angle between currents and a phase angle between current and voltages, and judges the type of a current voltage phase sequence according to a phase angle between current and voltages;
in the three-phase four-wire system, the MCU main control module judges whether a voltage signal line is wrongly accessed to a zero line or not through a line voltage fundamental wave effective value, judges whether a channel voltage vector is abnormal or not through a phase voltage fundamental wave effective value, judges whether a channel current vector is abnormal or not through a fundamental wave current effective value, judges a voltage phase sequence through a phase angle between voltages, judges a current phase sequence through a phase angle between currents, judges a current polarity through a phase angle between currents and a phase angle between current and voltage, and judges a current and voltage phase sequence through a phase angle between current and voltage.
Still further, defining effective values u1, u2, u3 of the voltage channels as effective values of the voltage channels 1, 2, 3, respectively, effective values i1, i2, i3 of the current channels as effective values of the current channels 1, 2, 3, respectively, a voltage phase angle uxuy is an included angle between the voltage channel x and the voltage channel y, a current phase angle ixiy is an included angle between the current channel x and the current channel y, and a current voltage phase angle ixuy is an included angle between the current channel x and the voltage channel y; wherein x and y are positive integers of 1, 2 and 3;
in a three-phase three-wire system, the MCU main control module judges whether an effective value u1 or u2 or u1u2 is smaller than a preset voltage effective value one, if so, the voltage vector is determined to be absent, otherwise, whether a voltage phase angle u2u1 is positioned in a preset phase angle range one is determined, if so, the voltage phase reversal sequence is determined, otherwise, whether a current effective value i1/i3 is smaller than a preset current effective value one is determined, if so, the current vector is absent, otherwise, whether the angle of a current phase angle i3i1 is correct is determined; if the current phase sequence is correct, judging the current phase sequence and preliminarily judging the current polarity; when the angle of the current phase angle i3i1 is wrong or the current phase sequence or the current polarity is determined, whether the current and voltage phase angles i1u1 and i3u3 are correct or not is determined, the current polarity is finally determined, and whether the voltage phase sequence is wrong or not is determined.
In a three-phase four-wire system, the MCU main control module judges whether a voltage effective value is larger than a preset voltage effective value two, if so, the voltage signal line is judged to be wrongly connected to a zero line, otherwise, whether the voltage effective value is smaller than a preset voltage effective value three is judged, if so, the channel voltage vector is judged to be abnormal, otherwise, whether the line voltage is smaller than a preset voltage effective value four is judged, if so, the voltage polarity is the same, otherwise, whether a voltage phase angle u2u1 is positioned in a preset phase angle range two and a voltage phase angle u3u1 is positioned in a preset phase angle range three is judged, if so, the voltage reverse phase sequence is judged, otherwise, whether the current is smaller than a preset current effective value two is judged, if so, the current vector is judged to be abnormal, otherwise, whether the symbol types of the current phase angles i2i1, i3i1 and i3i2 are correct is judged, the current phase sequence is judged correctly, and the current polarity, if the current phase angle is wrong, whether the symbol types of the current and voltage phase angles i1u1, i2u2 and i3u2 are correct is judged, and finally the current polarity and the current and voltage phase sequence are judged.
As a further improvement of the scheme, the load of the three-phase three-wire ammeter user is inductive load, and the load wiring is UabIb，UcbIaThe MCU master control module is used for firstly calculating the wrong electric quantity W1 and then calculating the correct electric quantity, and the calculation formula is
Figure BDA0002525952480000061
Figure BDA0002525952480000062
Finally, the compensation electric quantity is calculated, and the compensation electric quantity is the difference between the correct electric quantity W2 and the error electric quantity W1.
As a further improvement of the above solution, the voltage channel vector abnormal condition is characterized by a voltage abnormality of at least one channel and at most two channels of the three voltage channels, the current channel vector abnormal condition is characterized by an abnormality of at least one channel of the three current channels, and the voltage polarity identity condition is characterized by a voltage polarity identity of at least two channels of the three voltage channels.
The invention also provides an electric energy meter control method with the functions of automatic identification of wrong wiring and correct metering, which is applied to any electric energy meter with the functions of automatic identification of wrong wiring and correct metering and comprises the following steps:
collecting a three-phase voltage value, a three-phase voltage phase angle, a three-phase current value and a three-phase current phase angle of the electric energy meter;
judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle, and obtaining a corresponding vector diagram; firstly, comparing the vector diagram with a preset correct vector diagram and the power included angle relationship thereof to obtain the most kinds of numbers of possible correct metering combinations, then carrying out integral metering on all the possible correct metering combinations to generate a plurality of electric quantity values, and finally selecting the only correct electric quantity from the plurality of electric quantity values through the property of the current metering point input from the outside and judging whether a wiring error exists or not;
if the wiring error exists, searching whether a preset vector legend which is the same as the vector diagram exists in a preset wrong wiring database; if the preset vector legend exists in the wrong wiring database, acquiring a wiring error type corresponding to the vector diagram, and issuing a correction instruction for correcting the wiring error according to the wiring error type;
if no wiring error exists, judging that the wiring of the electric energy meter is correct;
judging whether the wrong wiring is wrong-phase wiring or reverse wiring according to the correction instruction;
when the wrong wiring is one of the wrong wiring, correcting the wrong wiring according to the correction instruction and simultaneously metering and storing possible correct metering;
if the wrong wiring condition is reverse wiring, correcting the reverse wiring according to the correction instruction;
and correcting all possible correct metering wires for the wrong wires and simultaneously metering the wrong wires by logic derivation of the vector diagram and the wrong wire database according to the automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing compensation on the electric quantity according to the difference between the correct electric quantity and the wrong electric quantity.
Compared with the existing electric energy meter, the electric energy meter with the functions of automatic identification of wrong wiring and correct metering and the method thereof have the following beneficial effects:
1. the electric energy meter with the functions of automatic identification and correct metering of wrong wiring is characterized in that three-phase voltage and current information of the electric energy meter is collected through a three-phase voltage collecting unit and a three-phase current collecting unit of a collecting module, and a metering module forms a vector diagram according to the three-phase voltage and current information, so that an MCU main control module can judge whether wiring errors exist according to the vector diagram, if yes, corresponding wiring error types are found in a wrong wiring database, and corresponding correction instructions are issued to an automatic error correction module, so that the automatic error correction module can correct the wrong wiring through a wrong phase error correction unit and a reverse error correction unit according to the wiring error types, and meanwhile, the MCU main control module calculates the compensation electric quantity according to the wiring automatic error correction change time and the wrong wiring state, so as to obtain the final correct electric quantity information, thereby on one hand, the wrong wiring can be automatically identified, on the other hand, the correct electric quantity can be calculated, the correct metering mode is stored in the meter for selection, and the correct metering function is realized, so that the electric energy loss can be reduced, the electric quantity can be supplemented conveniently, and the anti-theft function can be realized. The manual installation technical requirement of the electric energy meter is reduced, the electricity stealing caused by manual wrong wiring can be prevented, the problem that the wiring is correct but false alarm occurs is avoided, the defect of performing after-repair metering is overcome, and the accurate metering of the electric quantity is guaranteed in real time.
2. The electric energy meter with the functions of automatic identification of wrong wiring and correct metering carries out correct electric quantity calculation under the condition of not intervening wrong wiring, and meanwhile, a set of wrong calculation results can be completely reserved. And moreover, a set of complete split-phase and combined-phase active electric energy metering and calculating units are independently developed, and the wrong vector is subjected to channel switching, vector rotation and other operations, so that a correct metering result is obtained. The result is independent of the error calculation result and is convenient to be used as a reference for electric quantity compensation. According to the voltage and current information sampled by the three-phase intelligent electric energy meter, the possible correct metering combination types are deduced by adopting intelligent analysis, all types are carried out, and meanwhile, an integral metering storage mode is entered. When key conditions, namely the property of a metering point, are input from the outside of the electric energy meter (namely the metering point is a power supply or a load property, and is a capacitive load or an inductive load), the electric energy meter automatically gives correct electric quantity value information. When the three-phase intelligent electric energy meter is connected to a power grid for operation, voltage and current vector data sampled by the electric meter are analyzed and logically intelligently inferred, and then all metering units which are possibly correct are subjected to real-time synchronous integral operation. The intelligent electric energy meter can simultaneously output a set of metering results of wrong wiring and a set of corrected correct metering results no matter how the wires outside the meter are connected for typical wrong wiring with practical significance. The corrected correct metering result can still meet the accuracy requirement of the electric meter, and errors can be directly detected on the platform body, so that the electric energy meter has the advantages of automatic detection and correction of wiring errors and accurate electric quantity compensation.
3. The beneficial effects of the electric energy meter control method with the functions of automatic identification of wrong wiring and correct metering are the same as those of the electric energy meter with the functions of automatic identification of wrong wiring and correct metering, and are not repeated herein.
Drawings
Fig. 1 is a structural diagram of an electric energy meter having functions of automatic identification of faulty wiring and accurate metering according to embodiment 1 of the present invention.
Fig. 2 is a flow chart of the wrong wiring judgment of the three-phase three-wire system of the electric energy meter with the functions of automatic wrong wiring identification and correct metering in embodiment 1 of the present invention.
Fig. 3 is a normal vector diagram of the electric energy meter with the functions of automatic identification of wrong wiring and correct metering in embodiment 1 of the present invention.
Fig. 4 is a diagram of correct wiring of the electric energy meter with the functions of automatic identification of incorrect wiring and correct metering in accordance with embodiment 1 of the present invention.
Fig. 5 is an actual vector diagram of the electric energy meter with the functions of automatic identification of wrong wiring and correct metering in embodiment 1 of the present invention.
Fig. 6 is a flow chart of the miswiring judgment of the three-phase four-wire system of the electric energy meter with the functions of automatic identification of miswiring and correct metering in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1, the present embodiment provides an electric energy meter with functions of automatic identification of wrong wiring and correct metering, and the electric energy meter is a three-phase intelligent electric energy meter. The electric energy meter comprises an acquisition module, a metering module, an MCU (microprogrammed control unit) main control module, an automatic error correction module and a communication module. Some modules in these modules may be integrated together to form a new module, or may be independently arranged, or may be split into multiple sub-modules. Of course, the hardware of these modules may be part of the hardware of the existing electric energy meter, and only the existing part of the hardware needs to be upgraded.
The acquisition module comprises a three-phase voltage acquisition unit and a three-phase current acquisition unit. The three-phase voltage acquisition unit is used for acquiring a three-phase voltage value and a three-phase voltage phase angle of the electric energy meter, and the three-phase current acquisition unit is used for acquiring a three-phase current value and a three-phase current phase angle of the electric energy meter. In this embodiment, the three-phase voltage acquisition unit and the three-phase current acquisition unit may both adopt the acquisition unit in the existing three-phase electric energy meter, and certainly, a module may also be separately set to detect these information. Of course, in other embodiments, the acquisition module may also include other acquisition units, which may acquire more information, and the data may be monitored by the MCU main control module in real time through the communication module.
And the metering module is used for judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle and obtaining a corresponding vector diagram. The metering module comprises a power metering unit and an electric energy metering unit. The power metering unit is used for calculating the power under the current wiring condition, and the electric energy metering unit is used for calculating the electric energy and clearing the electric quantity under the current wiring condition. And data interaction is carried out between the metering module and the MCU main control module, the metering module can send the vector diagram to the MCU main control module, and the MCU main control module can also control the metering module to generate the vector diagram.
The MCU main control module is used for comparing the vector diagram with a preset correct vector diagram and a power included angle relationship thereof according to the vector diagram to obtain the most kinds of numbers of possible correct metering combinations, then performing integral metering on all the possible correct metering combinations to generate a plurality of electric quantity values, and finally selecting the only correct electric quantity from the plurality of electric quantity values according to the property of the current metering point input from the outside and judging whether a wiring error exists. Wherein, the property of the current metering point is one of a power supply and a load, one of a capacitive load and an inductive load, or a combination of the two properties. If the wiring error exists, the MCU main control module searches whether a preset vector legend identical to the vector diagram exists in a preset wrong wiring database. When a preset vector legend exists in the wrong wiring database, the MCU main control module acquires the wiring error type corresponding to the vector legend and issues a correction instruction for correcting the wiring error according to the wiring error type. If no wiring error exists, the MCU main control module judges that the wiring of the electric energy meter is correct, namely the power and electric energy calculation under the current wiring condition is correct, and the electric quantity can be correctly calculated. The MCU main control module is also used for correcting all possible correct metering wires and metering simultaneously for the wrong wires through logic derivation of the vector diagram and the wrong wire connection database according to automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing electric quantity compensation according to the difference between the correct electric quantity and the wrong electric quantity. The MCU main control module issues a correction instruction to the automatic error correction module through the communication module, and also performs communication data interaction with the electric quantity metering management system through the communication module, so that correct electric quantity information is uploaded to the metering management system, and meanwhile, the metering management system can check the correct electric quantity information in real time.
In the present embodiment, the wrong wiring database is provided with two systems of three-phase three-wire and three-phase four-wire, and includes the wrong wiring type and the judgment method. The three-phase three-wire system and the three-phase four-wire system are two actual wiring modes of the electric energy meter, so for the electric energy meter, the two systems are required to be preset in advance, but the two systems are not started simultaneously in the use process, and only one system is used. These two systems will be described separately below.
In the three-phase three-wire system, the wiring kind in the wrong wiring database is provided with 48 full wiring cases and 9 other cases. Each full-wiring condition is determined by a voltage phase sequence, a current phase sequence, and a current polarity combination. The 6 voltage phase sequences in the 48 full-wiring conditions are respectively a correct phase sequence UaUbUc, a wrong phase sequence UbUcUa, UcUaUb, a reverse phase sequence UaUcUb, UbUaUc, UcUbUa, 2 current phase sequence types are respectively a normal current phase sequence IaIC and an error current phase sequence IcIa, and the 4 current polarities are respectively a correct current polarity Ia + Ic +, an error current polarity Ia + Ic-, Ia-Ic +. There is one and only one of the 48 full-wiring conditions, and the remaining wiring conditions are faulty wiring, with the voltage channel connected to UaUbUc and the current channel connected to Ia + Ic + in the correct wiring condition. The 9 other cases include 3 channel voltage vector deletions, 3 channel voltage polarities being the same, and 3 channel current vector deletions.
In this embodiment, the channel voltage vector deficiency is determined by the voltage significance. The voltage phase sequence is only related to the phase angle between the voltages, and the voltage reverse phase sequence can be judged through the included angle between the voltage channels 1 and 2. The channel current vector missing is judged by the effective value of the current. Because the phase sequence of the current is only related to the included angle between the currents, the positive current phase sequence/the negative current phase sequence can be judged through the included angle between the current channel 3 and the current channel 1. The type of the reverse polarity of the current can be preliminarily determined through the included angle between the currents. Specific criterion
TABLE 1 wrong wiring type and its judgment basis (three-phase three-wire)
Wrong type of wiring Basis of determination
Channel voltage vector absence Fundamental voltage effective value
Channel current vector absence Effective value of fundamental current
Phase sequence of voltage Phase angle between voltages
Phase sequence of current Phase angle between currents
Polarity of current Through the phase angle between currents and the phase angle between current and voltage
Current voltage phase sequence Through the phase angle between the current and the voltage.
As shown in table 1, in the three-phase three-wire system, the MCU master control module determines whether the channel voltage vector is missing through the effective value of the fundamental voltage, determines whether the channel current vector is missing through the effective value of the fundamental current, determines the phase sequence of the voltage through the phase angle between the voltages, determines the phase sequence of the current through the phase angle between the currents, determines the polarity type of the current through the phase angle between the currents and the phase angle between the voltages, and determines the phase sequence of the current and the voltage through the phase angle between the currents and the voltages. For better description, in this embodiment, the effective values u1, u2, u3 of the voltage channels are defined as the effective values of the voltage channels 1, 2, 3, respectively, the effective values i1, i2, i3 of the current channels are defined as the effective values of the current channels 1, 2, 3, respectively, the voltage phase angle uxuy is the included angle between the voltage channel x and the voltage channel y, the current phase angle ixiy is the included angle between the current channel x and the current channel y, and the current voltage phase angle ixuy is the included angle between the current channel x and the voltage channel y. Wherein x and y are positive integers of 1, 2 and 3.
Referring to fig. 2, in the three-phase three-wire system, the MCU main control module determines whether the effective value u1 or u2 or u1u2 is smaller than a preset voltage effective value one (0.2 Un in this embodiment), if yes, it determines that the voltage vector is missing, otherwise, it determines whether the voltage phase angle u2u1 is within a preset phase angle range one (60 ° ± the set range, default range ± 10 °), if no, it determines whether the current effective value i1/i3 is smaller than a preset current effective value one (0.005Ib in this embodiment), if yes, it determines that the current vector is missing, otherwise, it determines whether the angle of the current phase angle i3i1 is correct. If the current phase sequence is correct, the current phase sequence is judged, and the current polarity is preliminarily judged. When the angle of the current phase angle i3i1 is wrong or the current phase sequence and the current polarity are determined, whether the current and voltage phase angles i1u1 and i3u3 are correct or not is determined, the current polarity is finally determined, and whether the voltage phase sequence is wrong or not is determined.
According to voltage and current information obtained by sampling of the three-phase intelligent electric energy meter, when key conditions are input outside the electric energy meter (namely the power supply of the metering point is a load property, a capacitive load or an inductive load), the electric energy meter can automatically give correct electric quantity numerical value information, the operations of channel switching, vector rotation and the like on error vectors of the voltage and the current sampled by the electric energy meter are realized, and real-time synchronous integral operation is carried out on all metering units which are possible to be correct. In this embodiment, a three-phase three-wire electric energy meter is taken as an example, and the three-phase three-wire electric energy meter is synthesized by two metering units. Namely: p is UAB·Iacos(30°+φa)+UCB·Iccos(30°-φc) In a three-phase fully symmetrical circuit, we find:
Figure BDA0002525952480000121
namely: phi is aa＝φc，UAB＝UCB. U is line voltage, I is phase current, and P is three-phase power. The available electric quantity W is:
Figure BDA0002525952480000122
Figure BDA0002525952480000123
the above is an integral expression of two units in normal metering, and the corresponding vector diagram is shown in fig. 3, and the corresponding correct wiring diagram of the three-phase three-wire electric energy meter is shown in fig. 4.
Seven connecting terminals are totally arranged on the three-phase three-wire ammeter, and 2, 4 and 6 are respectively connected with a Ua，Ub，UcAnd voltage, 1 and 3 are connected with the phase A current inlet and outlet, and 5 and 7 are connected with the phase C current inlet and outlet. This is a correct, regular wiring, and if the wiring is wrong, the metering misalignment will result in erroneous metering data. Because the metering loops are all provided with grounding devices, if the voltage and the current are connected in a wrong way, short-circuit faults can be generated, and therefore metering data cannot be formed. In this case, all the existing electric energy meters which are not correctly wired are formed to generate wrong metering data. How to achieve the correct metering under various wrong wiring conditions in the present embodiment is described as follows:
according to the alternating current analog information collected by the three-phase three-wire electric energy meter, the initial definition is as follows: u shape1I1，U2I2The phase sequence and the effective value are judged, the vector diagram is obtained from the judgment, and is compared with the correct vector diagram and the power included angle relationship thereof, because the technology has the vector diagram and the power included angle relationship corresponding to various databases under wrong wiring in the internal memory of the electric meter, and because the properties (power supply, load, capacitance, sensibility) and the like of the current metering point are not known. The most possible correct metering combinations are obtained, and the most normal integral metering is carried out internally, so that the most corresponding electric quantity values are generated. When the external condition is confirmed, the correct electric quantity value of the unique species is given. Of course, if external conditions are input to the electricity meter when the electricity meter is installed, the embodiment generates a unique correct electric quantity information, thereby ensuring that correct metering can be realized no matter how the wire is connected.
Examples are: one metering point adopts three-phase three-wire metering mode, at this time the three-phase three-wire metering mode is mountedThe load of the line electric meter user is inductive load cos phi which is 0.5, the load connected with the electric meter is connected with a line UabIb，UcbIaThe actual vector direction of the meter at this time is shown in fig. 5. At this time, the MCU master control module is configured to calculate an error electric quantity W1, calculate a correct electric quantity, and calculate a compensation electric quantity, where the compensation electric quantity is a difference between the correct electric quantity W2 and the error electric quantity W1. The formula for the error amount of electricity metered by the electricity meter in such a case is:
Figure BDA0002525952480000131
the expression for the correct amount of power is:
Figure BDA0002525952480000132
in the present embodiment, the correct metering is achieved by the following procedure. It is assumed that the external condition constraint of the user metering point does not input the technical electric meter of the patent. The technical ammeter of the patent can compare and judge the metering power expression of the wrong wiring, and the fact that the wrong wiring needs to be corrected is obtained. Then the database is entered for comparison to arrive at the correct possible categories. The following were used:
one element is U1-I1Binary is U2-I2The correct measurement is thus obtained for the power state when cos Φ is 1.0, i.e.:
Figure BDA0002525952480000133
one is U1-I1Binary is U2-I2Inverse measurement when cos phi is 1.0 in the loaded state
To obtain I1And I2And (5) the conclusion of reversal. Namely:
Figure BDA0002525952480000141
the positive electric quantity is only required to be positive. Namely:
Figure BDA0002525952480000142
③ one is U1IbBinary is U2I1The error electric quantity under the load sensitivity state cos phi of 0.5 is:
Figure BDA0002525952480000143
corrected to be unary as U1I2(Ia) The two is-U1I1(Ib) The correct electric quantity is obtained as follows:
Figure BDA0002525952480000144
fourthly, the unitary is-U2I2，U2I1In this case, the capacitance cos φ is 0.5(c) under load, and after correction
The correct amount of power should be:
Figure BDA0002525952480000145
similarly, the inductance cos Φ in the power supply state is 0.5 and the capacitance cos Φ in the power supply state is 0.5 c. Two are corresponding plus (-) negative sign under load.
In the three-phase four-wire system, the wiring types in the wrong wiring database are set to 2 first-type wiring conditions, 1152 second-type wiring conditions and 17 third-type other conditions. The first type of connection is 2 connection modes, namely, voltage connection UbUcUaUn and current connection + Ib + Ic + Ia, voltage connection UcUaUbUn and current connection + Ic + Ia + Ib. Each second type of wiring condition is determined by a combination of voltage phase sequence, current phase sequence and current polarity. 1152, specific introduction of the second type of wiring condition is shown in table 2, wherein 24 voltage phase sequences are positive voltage phase sequences uaubuun, ubucuun, UcUaUbUn, negative voltage phase sequences uaucuun, ubuaucuun, negative voltage phase sequences uaucuun, ubuuuu, ucuu, and 18 live wires are connected to the zero line in a staggered manner, 6 current phase sequences are positive current phase sequences IaIbIc, ibicla, iciib, and negative current phase sequences IbIaIc, iciibib, and 8 current phase sequences ibiiic, iciibi, and 8 current polarities are + i1+ i2+ i3, -i1-i 3, -i1+ i2+ i3, -i1-i2-i3, + 1-i2+ i3, -i-38 1-i 38 12, -36387 3848 + i + 3646 + 468 + i 38387 48-3646. The 17 third other cases are shown in table 3, which are 6 kinds of voltage channel vector anomalies, 7 kinds of current channel vector anomalies, and 4 kinds of cases with the same voltage polarity, respectively. In this embodiment, the voltage channel vector abnormal condition is characterized by a voltage abnormality of at least one channel and at most two channels of the three voltage channels, the current channel vector abnormal condition is characterized by an abnormality of at least one channel of the three current channels, and the condition of the same voltage polarity is characterized by the same voltage polarity of at least two channels of the three voltage channels.
TABLE 2 comparison table of the second type of wiring
Figure BDA0002525952480000151
TABLE 3 comparison table of third type connection condition
Figure BDA0002525952480000152
Figure BDA0002525952480000161
In three-phase four-wire system, MCU main control module judges through line voltage fundamental wave significant value whether voltage signal line inserts the zero line by mistake, judge that the passageway voltage vector is unusual through phase voltage fundamental wave significant value, judge whether passageway current vector is unusual through the fundamental wave current significant value, judge the voltage phase sequence through the phase angle between the voltage, judge the current phase sequence through the phase angle between the electric current, judge the current polarity through the phase angle between the electric current and the electric current voltage, judge the current voltage phase sequence through the phase angle between the electric current and the electric current voltage, show as table 4 specifically.
TABLE 4 wrong wiring type and its judgment basis (three-phase four-wire)
Wrong type of wiring Basis of determination
The voltage signal line is wrongly connected to the zero line Line voltage fundamental effective value
Channel voltage vector anomaly Fundamental effective value of phase voltage
Channel current vector anomaly Effective value of fundamental current
Phase sequence of voltage Phase angle between voltages
Phase sequence of current Phase angle between currents
Polarity of current Phase angle between currents and phase angle between current and voltage
Current voltage phase sequence Phase angle between current and voltage
Referring to fig. 6, in the three-phase four-wire system, the MCU master control module determines whether there is a voltage effective value greater than a second preset voltage effective value (1.4 Un in this embodiment), if so, it determines that the voltage signal line is erroneously connected to the zero line, otherwise, it determines whether there is a voltage effective value less than a third preset voltage effective value (0.2 Un in this embodiment), if so, it determines that the channel voltage vector is abnormal, otherwise, it determines whether there is a voltage effective value less than a fourth preset voltage effective value (0.2 Un in this embodiment), if so, it determines that the voltage polarities are the same, otherwise, it determines whether there is a voltage phase angle u2u1 located in a second preset phase angle range (240 ° ± 10 °), and a voltage phase angle u3u1 located in a third preset phase angle range (120 ° ± 10 °), if so, it determines that the voltage phase inversion sequence is, otherwise, it determines that there is a current effective value less than a second preset current effective value (0.005), if, otherwise, judging whether the symbol types of the current phase angles i2i1, i3i1 and i3i2 are correct, judging the current phase sequence and preliminarily judging the current polarity if the symbol types of the current phase angles i2i1, i3i1 and i3i2 are correct, judging whether the symbol types of the current voltage phase angles i1u1, i2u2 and i3u2 are correct if the symbol types of the current voltage phase angles i3i1, i2u2 and i3u2 are.
The automatic error correction module comprises an error correction unit and a reverse error correction unit. And the automatic error correction module judges whether the wrong wiring is wrong-phase wiring or reverse wiring according to the correction instruction. When the wrong wiring condition is one of the wrong wiring, the wrong wiring correction unit corrects the wrong wiring according to the correction instruction. In this embodiment, the input end of the error correction unit is configured to receive the a-phase current, the B-phase current, the C-phase current, the a-phase voltage, the B-phase voltage, and the C-phase voltage, and the output end of the error correction unit is electrically connected to the power metering unit. The wrong phase error correction unit is also electrically connected with the communication module, corrects wrong phase wiring according to a correction instruction received by the communication module and simultaneously measures and stores possible correct measurement. When the wrong wiring condition is reverse, the reverse error correction unit corrects the reverse wiring according to the correction instruction. The input end of the reverse error correction unit is electrically connected with the active power output end and the reactive power output end of the power metering unit, and the output end of the reverse error correction unit is electrically connected with the input end of the electric energy metering unit. The reverse error correction unit is also electrically connected with the communication module and corrects reverse wiring according to the correction instruction received by the communication module. It should be noted here that the correction manner of the automatic error correction module is not really performing correction on the external connection in this embodiment, but only performing correction on the inside of the electric energy meter, and of course, in some other embodiments, the correction manner may be different.
In summary, compared with the existing electric energy meter, the electric energy meter with the functions of automatic identification of wrong wiring and correct metering has the following advantages:
1. the electric energy meter with the functions of automatic identification and correct metering of wrong wiring is characterized in that three-phase voltage and current information of the electric energy meter is collected through a three-phase voltage collecting unit and a three-phase current collecting unit of a collecting module, and a metering module forms a vector diagram according to the three-phase voltage and current information, so that an MCU main control module can judge whether wiring errors exist according to the vector diagram, if yes, corresponding wiring error types are found in a wrong wiring database, and corresponding correction instructions are issued to an automatic error correction module, so that the automatic error correction module can correct the wrong wiring through a wrong phase error correction unit and a reverse error correction unit according to the wiring error types, and meanwhile, the MCU main control module calculates the compensation electric quantity according to the wiring automatic error correction change time and the wrong wiring state, so as to obtain the final correct electric quantity information, thereby on one hand, the wrong wiring can be automatically identified, on the other hand, the correct electric quantity can be calculated, the correct metering mode is stored in the meter for selection, and the correct metering function is realized, so that the electric energy loss can be reduced, the electric quantity can be supplemented conveniently, and the anti-theft function can be realized. The manual installation technical requirement of the electric energy meter is reduced, the electricity stealing caused by manual wrong wiring can be prevented, the problem that the wiring is correct but false alarm occurs is avoided, the defect of performing after-repair metering is overcome, and the accurate metering of the electric quantity is guaranteed in real time.
2. The electric energy meter with the functions of automatic identification of wrong wiring and correct metering carries out correct electric quantity calculation under the condition of not intervening wrong wiring, and meanwhile, a set of wrong calculation results can be completely reserved. And moreover, a set of complete split-phase and combined-phase active electric energy metering and calculating units are independently developed, and the wrong vector is subjected to channel switching, vector rotation and other operations, so that a correct metering result is obtained. The result is independent of the error calculation result and is convenient to be used as a reference for electric quantity compensation. According to the voltage and current information sampled by the three-phase intelligent electric energy meter, the possible correct metering combination types are deduced by adopting intelligent analysis, all types are carried out, and meanwhile, an integral metering storage mode is entered. When key conditions, namely the property of a metering point, are input from the outside of the electric energy meter (namely the metering point is a power supply or a load property, and is a capacitive load or an inductive load), the electric energy meter automatically gives correct electric quantity value information. When the three-phase intelligent electric energy meter is connected to a power grid for operation, voltage and current vector data sampled by the electric meter are analyzed and logically intelligently inferred, and then all metering units which are possibly correct are subjected to real-time synchronous integral operation. The intelligent electric energy meter can simultaneously output a set of metering results of wrong wiring and a set of corrected correct metering results no matter how the wires outside the meter are connected for typical wrong wiring with practical significance. The corrected correct metering result can still meet the accuracy requirement of the electric meter, and errors can be directly detected on the platform body, so that the electric energy meter has the advantages of automatic detection and correction of wiring errors and accurate electric quantity compensation.
Example 2
The embodiment provides an electric energy meter control method with the functions of automatic identification of wrong wiring and correct metering, and the method is applied to the electric energy meter with the functions of automatic identification of wrong wiring and correct metering in the embodiment 1. The electric energy meter control method of the embodiment may act on the existing electric energy meter as an upgrade program or the like, or may be separately configured and detachably installed in the existing electric energy meter through other structures, such as an integrated module, a controller, and the like, which is similar to the existing electric energy meter carrier module and may be independently configured. The electric energy meter control method comprises the following steps.
(1) And collecting the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle of the electric energy meter. The three-phase voltage and current information can be acquired by the acquisition module in the embodiment 1, and can also be acquired by the existing acquisition equipment.
(2) And judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle, and obtaining a corresponding vector diagram. In the vector diagram, the single-phase voltage has two attributes of value and direction, so that a plurality of vectors starting from the same origin can be formed.
(3) According to the vector diagram, the vector diagram is compared with a preset correct vector diagram and the power included angle relationship of the vector diagram, the maximum number of types of possible correct metering combinations is obtained, then integral metering is carried out on all the possible correct metering combinations, a plurality of electric quantity values are generated, finally, the only correct electric quantity is selected from the plurality of electric quantity values through the property of the current metering point input from the outside, and whether wiring errors exist is judged. The determination method described in embodiment 1 may be adopted as the determination method, and is not described in detail.
If the wiring error exists, whether a preset vector legend identical to the vector diagram exists or not is searched in a preset wrong wiring database. The preset vector legend is virtually the same as the vector diagram, i.e., there is a modulo vector group. And when a preset vector legend exists in the wrong wiring database, acquiring a wiring error type corresponding to the vector legend, and issuing a correction instruction for correcting the wiring error according to the wiring error type.
If no wiring error exists, the wiring of the electric energy meter is judged to be correct, and the electric quantity information collected in real time is correct electric quantity information.
(4) And judging whether the wrong wiring is wrong-phase wiring or reverse wiring according to the correction instruction. The determination method here is also described in example 1, and this method can be directly employed.
And when the wrong wiring is one of the wrong wiring, correcting the wrong wiring according to the correction instruction and simultaneously metering and storing the possible correct metering.
And if the wrong wiring condition is reverse wiring, correcting the reverse wiring according to the correction instruction.
(5) And correcting all possible correct metering wires for the wrong wires and simultaneously metering the wrong wires by logic derivation of the vector diagram and the wrong wire database according to the automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing compensation on the electric quantity according to the difference between the correct electric quantity and the wrong electric quantity.
Example 3
The embodiment provides a control system used by a three-phase intelligent electric energy meter, which can be applied as a product in a module form, similar to the existing electric energy meter carrier module. The control system is used for realizing the electric energy meter control method with the functions of automatic identification of wrong wiring and correct metering in the embodiment 2, and can be independent of the existing electric energy meter. The control system can also be in the form of hardware of the controller, so that in practical application, the controller is only required to be installed on a main control board of the electric energy meter. The control system can be integrated with the existing carrier module to form a new carrier module with a control function and control the existing electric energy meter.
Example 4
The present embodiments provide a computer terminal comprising a memory, a processor, and a computer program stored on the memory and executable on the processor. And when the processor executes the program, the steps of the electric energy meter control method with the functions of automatic wrong wiring identification and correct metering in the embodiment 2 are realized.
When the method in embodiment 2 is applied, the method can be applied in a software form, for example, a program designed to run independently is installed on a computer terminal, and the computer terminal can be a computer, a smart phone, a control system, other internet of things equipment, and the like. The method of embodiment 2 may also be designed as an embedded running program, and installed on a computer terminal, such as a single chip microcomputer.
Example 5
The present embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by the processor, the steps of the electric energy meter control method with the functions of automatic identification of wrong wiring and correct metering in embodiment 2 are realized.
When the method of embodiment 2 is applied, the method may be applied in the form of software, such as a program designed to be independently run by a computer-readable storage medium, which may be a usb disk designed as a usb shield, and the usb disk is designed to be a program for starting the whole method through external triggering.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An electric energy meter with functions of automatic recognition of wrong wiring and correct metering is characterized by comprising the following components:
the acquisition module comprises a three-phase voltage acquisition unit and a three-phase current acquisition unit; the three-phase voltage acquisition unit is used for acquiring a three-phase voltage value and a three-phase voltage phase angle of the electric energy meter, and the three-phase current acquisition unit is used for acquiring a three-phase current value and a three-phase current phase angle of the electric energy meter;
the metering module is used for judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle and obtaining a corresponding vector diagram;
the MCU main control module is used for comparing the vector diagram with a preset correct vector diagram and the power included angle relationship thereof to obtain the most kinds of numbers of possible correct metering combinations, then performing integral metering on all the possible correct metering combinations to generate a plurality of electric quantity values, and finally selecting the only correct electric quantity from the plurality of electric quantity values according to the property of the current metering point input from the outside and judging whether a wiring error exists or not; wherein, the property of the current metering point is one of a power supply and a load, and is also one of a capacitive load and an inductive load; if the wiring is wrong, the MCU main control module searches whether a preset vector legend which is the same as the vector diagram exists in a preset wrong wiring database; when the preset vector legend exists in the wrong wiring database, the MCU main control module acquires a wiring error type corresponding to the vector legend and issues a correction instruction for correcting the wiring error according to the wiring error type; if no wiring error exists, the MCU main control module judges that the wiring of the electric energy meter is correct; and
the automatic error correction module comprises an error correction unit and a reverse error correction unit; the automatic error correction module judges whether the wrong wiring is wrong-phase wiring or reverse wiring according to the correction instruction; when the wrong wiring is one of the wrong wiring, the wrong wiring correction unit corrects the wrong wiring according to the correction instruction and simultaneously measures and stores possible correct measurement; if the wrong wiring condition is reverse wiring, the reverse error correction unit corrects the reverse wiring according to the correction instruction; the MCU main control module is also used for correcting all possible correct metering wires and metering simultaneously for the wrong wires through logic derivation of the vector diagram and the wrong wire connection database according to automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing electric quantity compensation according to the difference between the correct electric quantity and the wrong electric quantity.
2. The electric energy meter with the functions of automatic wrong wiring identification and correct metering as claimed in claim 1, characterized in that the electric energy meter further comprises:
a communication module; the MCU master control module issues the correction instruction to the automatic error correction module through the communication module, and also performs communication data interaction with an electric quantity metering management system through the communication module.
3. The electric energy meter with the functions of automatic wrong wiring identification and correct metering as claimed in claim 2, wherein the metering module comprises a power metering unit and an electric energy metering unit; the power metering unit is used for calculating the power under the current wiring condition, and the electric energy metering unit is used for calculating the electric quantity of the electric energy under the current wiring condition.
4. The electric energy meter with the functions of automatically identifying the wrong wiring and correctly metering according to claim 3, wherein the input end of the wrong phase error correction unit is used for receiving A-phase current, B-phase current, C-phase current and A-phase voltage, B-phase voltage and C-phase voltage, and the output end of the wrong phase error correction unit is electrically connected with the power metering unit; the phase error correction unit is also electrically connected with the communication module and corrects phase error wiring according to the correction instruction received by the communication module;
the input end of the reverse error correction unit is electrically connected with the active power output end and the reactive power output end of the power metering unit, and the output end of the reverse error correction unit is electrically connected with the input end of the electric energy metering unit; the reverse error correction unit is electrically connected with the communication module and corrects reverse wiring according to the correction instruction received by the communication module.
5. The electric energy meter with the functions of automatic identification of wrong wiring and correct metering as claimed in claim 1, wherein said wrong wiring database is provided with two modes of three-phase three-wire and three-phase four-wire; wherein the content of the first and second substances,
in the three-phase three-wire system, the wiring types in the wrong wiring database are provided with 48 full wiring conditions and 9 other conditions; each full-wiring condition is determined by the combination of a voltage phase sequence, a current phase sequence and a current polarity; 6 voltage phase sequences in 48 full-wiring conditions are respectively a correct phase sequence UaUbUc, a wrong phase sequence UbUcUa and UcUaUb, a reverse phase sequence UaUcUb, UbUaUc and UcUbUa, 2 current phase sequence types are respectively a normal current phase sequence IaIC and an error current phase sequence IcIa, and 4 current polarities are respectively correct current polarity Ia + Ic +, error current polarity Ia + Ic-, Ia-Ic-and Ia-Ic +; the correct wiring condition of the 48 full wiring conditions is only one, and the rest wiring conditions are wrong wiring, wherein the voltage channel is connected with UaUbUc and the current channel is connected with Ia + Ic +; the 9 other cases include 3 channel voltage vector deletions, 3 channel voltage polarities being the same, and 3 channel current vector deletions;
in a three-phase four-wire system, the wiring types in the wrong wiring database are set to 2 first-type wiring conditions, 1152 second-type wiring conditions and 17 third-type other conditions; the first type of connection condition is 2 connection modes of voltage connection UbUcUaUn and current connection + Ib + Ic + Ia, voltage connection UcUaUbUn and current connection + Ic + Ia + Ib; each second type of wiring condition is determined by the combination of voltage phase sequence, current phase sequence and current polarity; in 1152 second kind of wiring cases, 24 kinds of voltage phase sequences are positive voltage phase sequences UaUbUcUn, UbUcUaUn, UcUaUbUn, negative voltage phase sequences UaUcUbUn, UbUaUcUn, UcUbUaUn and 18 kinds of live wires are staggered to zero line, 6 kinds of current phase sequences are positive current phase sequences IaIbic, IbIcIa, IcIaIb and negative current phase sequences IbIaIC, IbIa and IaIb, 8 kinds of current polarities are + i1+ i2+ i3, -i1-i2-i3, -i1+ i2+ i3, + 1-i2-i3, + i1-i2+ i3, -i 36 1-36 12, -i + 38i + 2+ i1-i 468 + i 48 + i 2; the 17 third other cases are 6 kinds of voltage channel vector anomalies, 7 kinds of current channel vector anomalies, and 4 kinds of cases with the same voltage polarity.
6. The electric energy meter with the functions of automatic identification of wrong wiring and correct metering as claimed in claim 5, wherein in a three-phase three-wire system, the MCU main control module judges whether a channel voltage vector is missing or not through a fundamental wave voltage effective value, judges whether a channel current vector is missing or not through a fundamental wave current effective value, judges a voltage phase sequence through a phase angle between voltages, judges a current phase sequence through a phase angle between currents, judges a current polarity type through a phase angle between currents and voltages, and judges a current voltage phase sequence through a phase angle between currents and voltages;
in the three-phase four-wire system, the MCU main control module judges whether a voltage signal line is wrongly accessed to a zero line or not through a line voltage fundamental wave effective value, judges whether a channel voltage vector is abnormal or not through a phase voltage fundamental wave effective value, judges whether a channel current vector is abnormal or not through a fundamental wave current effective value, judges a voltage phase sequence through a phase angle between voltages, judges a current phase sequence through a phase angle between currents, judges a current polarity through a phase angle between currents and a phase angle between current and voltage, and judges a current and voltage phase sequence through a phase angle between current and voltage.
7. The electric energy meter with the functions of automatic identification of wrong wiring and correct metering as claimed in claim 6, wherein effective values u1, u2, u3 of the voltage channels are respectively effective values of the voltage channels 1, 2, 3, effective values i1, i2, i3 of the current channels are respectively effective values of the current channels 1, 2, 3, a voltage phase angle uxuy is an included angle between the voltage channel x and the voltage channel y, a current phase angle ixiy is an included angle between the current channel x and the current channel y, and a current voltage phase angle ixuy is an included angle between the current channel x and the voltage channel y; wherein x and y are positive integers of 1, 2 and 3;
in a three-phase three-wire system, the MCU main control module judges whether an effective value u1 or u2 or u1u2 is smaller than a preset voltage effective value one, if so, the voltage vector is determined to be absent, otherwise, whether a voltage phase angle u2u1 is positioned in a preset phase angle range one is determined, if so, the voltage inverse phase sequence is determined, otherwise, whether a current effective value i1/i3 is smaller than a preset current effective value one is determined, if so, the current vector is determined to be absent, and if not, the angle of a current phase angle i3i1 is determined to be correct; if the current phase sequence is correct, judging the current phase sequence and preliminarily judging the current polarity; when the angle of the current phase angle i3i1 is wrong or the current phase sequence or the current polarity is judged, judging whether the current and voltage phase angles i1u1 and i3u3 are correct, finally judging the current polarity if the current and voltage phase angles are correct, and judging whether the voltage phase sequence is wrong;
in a three-phase four-wire system, the MCU main control module judges whether a voltage effective value is larger than a preset voltage effective value two, if so, the voltage signal line is judged to be wrongly connected to a zero line, otherwise, whether the voltage effective value is smaller than a preset voltage effective value three is judged, if so, the channel voltage vector is judged to be abnormal, otherwise, whether the line voltage is smaller than a preset voltage effective value four is judged, if so, the voltage polarity is the same, otherwise, whether a voltage phase angle u2u1 is positioned in a preset phase angle range two and a voltage phase angle u3u1 is positioned in a preset phase angle range three is judged, if so, the voltage reverse phase sequence is judged, otherwise, whether the current is smaller than a preset current effective value two is judged, if so, the current vector is judged to be abnormal, otherwise, whether the symbol types of the current phase angles i2i1, i3i1 and i3i2 are correct is judged, the current phase sequence is judged correctly, and the current polarity, if the current phase angle is wrong, whether the symbol types of the current and voltage phase angles i1u1, i2u2 and i3u2 are correct is judged, and finally the current polarity and the current and voltage phase sequence are judged.
8. The electric energy meter with the functions of automatically identifying wrong wiring and correctly metering as claimed in claim 1, wherein the load of the user of the three-phase three-wire electric meter is inductive load and the wiring of the load is UabIb，UcbIaThe MCU master control module is used for firstly calculating the wrong electric quantity W1 and then calculating the correct electric quantity, and the calculation formula is
Figure FDA0002525952470000051
Finally, the compensation electric quantity is calculated, and the compensation electric quantity is the difference between the correct electric quantity W2 and the error electric quantity W1.
9. The electric energy meter with the functions of automatic wrong wiring identification and correct metering according to claim 5, wherein the abnormal condition of the voltage channel vector is characterized by the abnormal voltage of at least one channel and at most two channels in three voltage channels, the abnormal condition of the current channel vector is characterized by the abnormal voltage of at least one channel in three current channels, and the same voltage polarity condition is characterized by the same voltage polarity of at least two channels in three voltage channels.
10. A method for controlling an electric energy meter with functions of automatic recognition of wrong wiring and correct metering, which is applied to the electric energy meter with functions of automatic recognition of wrong wiring and correct metering as claimed in any one of claims 1-9, and is characterized by comprising the following steps:
collecting a three-phase voltage value, a three-phase voltage phase angle, a three-phase current value and a three-phase current phase angle of the electric energy meter;
judging the phase sequence and the effective value according to the three-phase voltage value, the three-phase voltage phase angle, the three-phase current value and the three-phase current phase angle, and obtaining a corresponding vector diagram;
firstly, comparing the vector diagram with a preset correct vector diagram and the power included angle relationship thereof to obtain the most kinds of numbers of possible correct metering combinations, then carrying out integral metering on all the possible correct metering combinations to generate a plurality of electric quantity values, and finally selecting the only correct electric quantity from the plurality of electric quantity values through the property of the current metering point input from the outside and judging whether a wiring error exists or not;
if the wiring error exists, searching whether a preset vector legend which is the same as the vector diagram exists in a preset wrong wiring database; when the preset vector legend exists in the wrong wiring database, acquiring a wiring error type corresponding to the vector diagram, and issuing a correction instruction for correcting the wiring error according to the wiring error type;
if no wiring error exists, judging that the wiring of the electric energy meter is correct;
judging whether the wrong wiring is wrong-phase wiring or reverse wiring according to the correction instruction;
when the wrong wiring is one of the wrong wiring, correcting the wrong wiring according to the correction instruction and simultaneously metering and storing possible correct metering;
if the wrong wiring condition is reverse wiring, correcting the reverse wiring according to the correction instruction;
and correcting all possible correct metering wires for the wrong wires and simultaneously metering the wrong wires by logic derivation of the vector diagram and the wrong wire database according to the automatic wire connection error correction change time and the wrong wire connection state, finally confirming that the only correctly metered electric quantity exists in the electric energy meter, and performing compensation on the electric quantity according to the difference between the correct electric quantity and the wrong electric quantity.
CN202010504278.8A 2020-06-05 2020-06-05 Electric energy meter with functions of automatic identification of wrong wiring and correct metering and method thereof Pending CN111983521A (en)

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