CN110554351A - real load detection method and system of non-invasive load electric energy meter - Google Patents
real load detection method and system of non-invasive load electric energy meter Download PDFInfo
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- CN110554351A CN110554351A CN201910952756.9A CN201910952756A CN110554351A CN 110554351 A CN110554351 A CN 110554351A CN 201910952756 A CN201910952756 A CN 201910952756A CN 110554351 A CN110554351 A CN 110554351A
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Abstract
the invention discloses a real load detection method and a system of a non-invasive load electric energy meter, wherein the detection method comprises the following steps: s11: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter; s12: connecting a standard electric energy meter with a detected non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption; s13: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not. The invention judges whether the identification of the load electric quantity of the non-invasive load electric energy meter is qualified or not by acquiring the acquired data of the non-invasive load electric energy meter and the high-precision intelligent electric energy meter and comparing the acquired electric quantity data of each load branch.
Description
Technical Field
The invention relates to a real load detection method and a real load detection system of a non-invasive load electric energy meter, and belongs to the technical field of electrical equipment detection.
Background
along with the increase of the types and the number of smart homes, many household appliances have non-resistive loads such as inductive loads, capacitive loads and the like, such as asynchronous motors, rectifying devices and the like. The huge fluctuation generated by the current of the electric load of the dynamic load can cause the problems of frequency deviation, voltage fluctuation, voltage flicker, harmonic distortion, direct current injection and the like, and great hidden danger is caused to the electrical performance and the stability of the intelligent meter.
household users are important consumption ends of strong smart power grids and also important components of the power grids, and along with the increase of the types and the number of smart homes, many household appliances are non-resistive loads with inductance, capacitance and the like, such as asynchronous motors, rectifying equipment and the like. The huge fluctuation generated by the current of the electric load of the dynamic load can cause the problems of frequency deviation, voltage fluctuation, voltage flicker, harmonic distortion, direct current injection and the like, great hidden danger is caused to the electrical performance and stability of the intelligent meter, errors are caused to the electric energy metering, the electric energy meter can not be properly and reasonably charged, and economic loss is brought to a company.
At present, a user can monitor the service condition of an electric appliance in time through a household electric appliance load identification technology, the load identification technology is mainly divided into an invasive type and a non-invasive type, the invasive type means that a detection device is additionally arranged on each electric appliance, and the method is accurate, but high in cost and difficult to maintain. Non-intrusive means monitoring the total load data of the user to know the use condition of the user equipment. At present, the electric appliance is identified by starting the instantaneous waveform of the electric appliance, and the adopted methods comprise an artificial neural network algorithm, a cluster analysis method and an integer classification method. Although the non-invasive load electric energy meter is adopted to carry out identification and judgment on the household appliance load, detection measures for the non-invasive load electric energy meter are lacked.
Disclosure of Invention
aiming at the defects of the method, the invention provides a real load detection method and a real load detection system of a non-invasive load electric energy meter, which can detect the load identification accuracy and the error of the non-invasive load electric energy meter.
The technical scheme adopted for solving the technical problems is as follows:
in a first aspect, an embodiment of the present invention provides a real load detection method for a non-intrusive load electric energy meter, including the following steps:
s11: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
s12: connecting a standard electric energy meter with a detected non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
s13: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
as a possible implementation manner of this embodiment, the high-precision electric energy meter realizes the collection of the power consumption of each load branch, and the non-intrusive load electric energy meter is used as the device to be tested to obtain the total power consumption of the load and the electric quantity and the electric parameter of each load branch, and simultaneously identifies the operation load type and the load switching time point of the load branch.
As a possible implementation manner of this embodiment, the step S12 specifically includes the following sub-steps:
S121: the method comprises the following steps of connecting a standard electric energy meter and a non-invasive load electric energy meter in parallel to form a voltage loop, converting power supply voltage into multi-path isolation voltage (7 paths in the patent) through high-precision isolation PT, supplying power to the standard electric energy meter and the non-invasive load electric energy meter by each path of isolation voltage, and ensuring that voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both power supply voltage;
S122: the standard electric energy meter and the non-invasive load electric energy meter are connected in series to form a current loop, and power supply current sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the real load module, so that the current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter are consistent.
as a possible implementation manner of this embodiment, the process of performing accuracy comparison between the metering data and the load type identification includes:
Comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
And comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter.
In a second aspect, an embodiment of the present invention provides a method for detecting a real batch load of a non-intrusive load electric energy meter, including the following steps:
s21: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
S22: connecting a standard electric energy meter with at least one non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
S23: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
as a possible implementation manner of this embodiment, the high-precision electric energy meter implements power consumption collection of each load branch, and the non-intrusive load electric energy meter is used to obtain the total power consumption and the electric quantity of each load branch, and identify the operation load type and the load switching time point of the load branch at the same time.
As a possible implementation manner of this embodiment, the step S22 specifically includes the following sub-steps:
S221: the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form a voltage loop, the power supply voltage is changed into a plurality of paths of isolated voltages through a high-precision isolation PT, each path of voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are guaranteed to be the power supply voltage;
S222: the standard electric energy meter and the non-invasive load electric energy meter are connected in series to form a current loop, and power supply current sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the real load unit, so that the current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter are consistent.
As a possible implementation manner of this embodiment, the process of performing accuracy comparison between the metering data and the load type identification includes:
Comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter;
And comparing the load type and the load switching time point identified by the non-invasive electric energy meter with an actual load operation scheme set by an upper computer.
In a third aspect, the real load detection system for the non-invasive load electric energy meter provided by the embodiment of the invention comprises an upper computer, a detected non-invasive load electric energy meter, a high-precision electric energy meter, a standard electric energy meter and a multi-type real load unit; the high-precision electric energy meter connected with the real load is connected with the non-invasive load electric energy meter, and the standard electric energy meter and the non-invasive load electric energy meter form a voltage loop which is connected in parallel and is connected with the current loop in series; the upper computer is respectively connected with the detected non-invasive load electric energy meter, the high-precision electric energy meter and the standard electric energy meter and is used for carrying out accuracy comparison of the metering data and the load type identification, generating a test result and judging whether the error, the load type identification and the load switching identification of the detected non-invasive load electric energy meter are qualified or not.
As one possible implementation of the present embodiment,
The standard electric energy meter and the non-invasive load electric energy meter form a voltage loop which is connected in parallel, namely the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form the voltage loop, the power supply voltage is changed into a plurality of paths of isolation voltages through a high-precision isolation PT, each path of isolation voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and the voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both the power supply voltage;
The standard electric energy meter and the non-invasive load electric energy meter form a current loop which is connected in series, namely the standard electric energy meter and the non-invasive load electric energy meter are connected in series to form the current loop, and the power supply current sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the real load unit, so that the consistency of current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
the technical scheme of the embodiment of the invention has the following beneficial effects:
The method comprises the steps of obtaining collected data of the non-invasive load electric energy meter and the high-precision intelligent electric energy meter, comparing the obtained electric quantity data of each load branch, and judging whether the electric quantity identification of the non-invasive load electric energy meter is qualified or not; the real-load batch meter checking adopts the isolation PT, the load side voltage is changed into multi-path isolation voltage through the high-precision isolation PT, each path of voltage supplies power for the standard electric energy meter and the non-invasive load electric energy meter, the voltage sampling loop of the non-invasive load electric energy meter is guaranteed to be the load side voltage, and the batch verification error data precision is improved.
the invention can completely simulate the real load operation condition of an intelligent household, can flexibly combine different types of load operation from several dimensions such as load type, switching time, operation time, repetition times and the like, has simple and flexible system and convenient operation, and can realize automatic control.
the load identification accuracy and the error detection are carried out on the non-invasive load electric energy meter under the real load condition by randomly combining various household appliance loads, so that the load type identification accuracy is high, and batch meter detection under the real load is realized; the total load metering error and the partial load metering error are respectively compared, so that whether the non-invasive load electric energy meter is correct in electric quantity identification can be judged; comparing and judging the running scheme of the real load and the identification result of the tested electric meter through an upper computer, and realizing the load identification function detection of the non-invasive electric meter;
description of the drawings:
FIG. 1 is a flow chart illustrating a method of real load detection of a non-intrusive load power meter, according to an exemplary embodiment;
FIG. 2 is a flow diagram illustrating another method of batch real load detection of a non-intrusive load power meter, according to an exemplary embodiment;
FIG. 3 is a block diagram of a real load detection system for a non-intrusive load power meter, according to an exemplary embodiment;
fig. 4 is a schematic diagram illustrating batch testing of non-intrusive load electric energy meter voltages in accordance with an exemplary embodiment;
fig. 5 is a schematic diagram illustrating batch testing of non-intrusive load electric energy meter current according to an exemplary embodiment;
FIG. 6 is a block diagram of an actual load detection system of another non-intrusive load power meter, according to an exemplary embodiment;
FIG. 7 is a block diagram illustrating a real load control module in accordance with an exemplary embodiment;
Fig. 8 is a flow chart illustrating a method for testing a non-intrusive load power meter using a testing system in accordance with an exemplary embodiment.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
fig. 1 is a flow chart illustrating a method for detecting an actual load of a non-intrusive load power meter, according to an exemplary embodiment. As shown in fig. 1, an embodiment of the present invention provides a method for detecting an actual load of a non-intrusive load electric energy meter, including the following steps:
S11: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
s12: connecting a standard electric energy meter with a detected non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
s13: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
As a possible implementation manner of this embodiment, the high-precision electric energy meter implements power consumption collection of each load branch, and the non-intrusive load electric energy meter is used to obtain the total power consumption and the electric quantity of each load branch, and identify the operation load type and the load switching time point of the load branch at the same time.
As a possible implementation manner of this embodiment, the step S12 specifically includes the following sub-steps:
s121: the method comprises the following steps of connecting a standard electric energy meter and a non-invasive load electric energy meter in parallel to form a voltage loop, converting power supply voltage into multiple paths of isolated voltages through high-precision isolation PT, supplying power to the standard electric energy meter and the non-invasive load electric energy meter by each path of isolated voltage, and ensuring that voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both power supply voltage;
s122: in a current loop formed by connecting the standard electric energy meter and the non-invasive load electric energy meter in series, the current on the side of the commercial power load sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches a real load, so that the consistency of current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
As a possible implementation manner of this embodiment, the process of performing accuracy comparison between the metering data and the load type identification includes:
Comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter;
And comparing the load type and the load switching time point identified by the non-invasive electric energy meter with an actual load operation scheme set by an upper computer.
Fig. 2 is a flow chart illustrating a method for batch real load detection of a non-intrusive load power meter, according to an exemplary embodiment. As shown in fig. 2, a method for detecting a real batch load of a non-intrusive load electric energy meter according to an embodiment of the present invention includes the following steps:
s21: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
S22: connecting a standard electric energy meter with at least one non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
S23: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
As a possible implementation manner of this embodiment, the high-precision electric energy meter implements power consumption collection of each load branch, and the non-intrusive load electric energy meter is used to obtain the total power consumption and the electric quantity of each load branch, and identify the operation load type and the load switching time point of the load branch at the same time.
As a possible implementation manner of this embodiment, the step S22 specifically includes the following sub-steps:
s221: the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form a voltage loop, the power supply voltage is changed into a plurality of paths of isolated voltages through a high-precision isolation PT, each path of voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are guaranteed to be the power supply voltage;
S222: in a current loop formed by connecting the standard electric energy meter and the non-invasive load electric energy meter in series, the current on the side of the commercial power load sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches a real load, so that the consistency of current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
As a possible implementation manner of this embodiment, the process of performing accuracy comparison between the metering data and the load type identification includes:
Comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
And comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter.
The detection method comprises the steps of obtaining collected data of the non-invasive load electric energy meter and the intelligent electric energy meter, comparing the obtained electric quantity data of each load branch, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not; the real-load batch meter checking adopts the isolation PT, the power supply voltage is changed into multi-path isolation voltage through the high-precision isolation PT, each path of voltage supplies power for the standard electric energy meter and the non-invasive load electric energy meter, the voltage sampling loop of the non-invasive load electric energy meter is guaranteed to be the load side voltage, and the batch verification error data precision is improved.
Fig. 3 is a block diagram of a real load detection system for a non-intrusive load power meter, according to an exemplary embodiment. As shown in fig. 3, the real load detection system of a non-invasive load electric energy meter according to an embodiment of the present invention includes an upper computer, a detected non-invasive load electric energy meter, a high-precision electric energy meter, a standard electric energy meter, and a multi-type real load unit; the high-precision electric energy meter connected with the real load is connected with the non-invasive load electric energy meter, and the standard electric energy meter and the non-invasive load electric energy meter form a voltage loop which is connected in parallel and is connected with the current loop in series; the upper computer is respectively connected with the detected non-invasive load electric energy meter, the high-precision electric energy meter and the standard electric energy meter and is used for carrying out accuracy comparison of the metering data and the load type identification, generating a test result and judging whether the error, the load type identification and the load switching identification of the detected non-invasive load electric energy meter are qualified or not.
as one possible implementation of the present embodiment,
The standard electric energy meter and the non-invasive load electric energy meter form a voltage loop which is connected in parallel, namely the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form the voltage loop, the power supply voltage is changed into a plurality of paths of isolation voltages through a high-precision isolation PT, each path of isolation voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and the voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both the power supply voltage;
The standard electric energy meter and the non-invasive load electric energy meter form a current loop which is connected in series, namely the standard electric energy meter and the non-invasive load electric energy meter are connected in series to form the current loop, and the power supply current sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the real load unit, so that the consistency of current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
At least one non-invasive load electric energy meter is arranged in the voltage loop and the current loop, so that the single non-invasive load electric energy meter can be detected individually or in batch.
by randomly combining various electric appliances, the start-stop, the running time, the starting sequence and the like of the electric appliances can be set, and the upper computer realizes the load identification accuracy and the error verification of the non-invasive load electric energy meter.
the upper computer records the load type and the power consumption of a single load in operation, and the accuracy data is obtained by reading the load type and the power consumption of the single load recorded by the non-invasive electric energy meter and then comparing the data.
the host computer issues commands, the non-invasive load electric energy meter is responsible for acquiring total power consumption information and electric quantity information of each load branch, and the high-precision intelligent electric energy meter is responsible for collecting the electric quantity of each load branch.
The upper computer compares the acquired electric quantity data of each load branch by acquiring the acquired data of the non-invasive load electric energy meter and the intelligent electric energy meter. And automatically judging whether the error of the non-invasive load electric energy meter is in a normal range.
the current loop is formed by sequentially connecting a standard meter and a plurality of non-invasive load electric energy meters (6 meters are shown in fig. 4 and 5) in series by mains supply, and the current acquisition loops of the electric energy meters are ensured to be consistent.
As shown in fig. 3, the upper computer issues a command, the non-invasive load electric energy meter is responsible for acquiring total power consumption information and electric quantity information and electric parameter information of each load branch, and the high-precision intelligent electric energy meter is responsible for metering the power consumption of each load branch.
The upper computer compares the acquired electric quantity data of each load branch by acquiring the electric quantity data of the non-invasive load electric energy meter and the high-precision intelligent electric energy meter. And automatically judging whether the electric quantity identification error of the non-invasive load electric energy meter is in a normal range.
as shown in fig. 4, in order to ensure that the batch verification error data is affected by the self power consumption of the non-invasive load electric energy meter to cause data deviation, the power supply voltage supplies sampling voltage to the non-invasive load electric energy meter through 7 paths of high-precision isolation PT, and it is ensured that the voltage sampling loops of the non-invasive load electric energy meter are all power supply voltage.
As shown in fig. 5, the current loop is formed by sequentially connecting a standard meter and 6 non-invasive load electric energy meters in series by mains supply, so as to ensure that the current acquisition loops of the electric energy meters are consistent.
FIG. 6 is a block diagram of an actual load detection system of another non-intrusive load power meter, according to an exemplary embodiment; as shown in fig. 6, another real load detection system for a non-invasive load electric energy meter according to an embodiment of the present invention includes an upper computer 1, where the upper computer 1 is connected to an exchanger 2 through a network cable, the exchanger 2 is connected to a control module 6 and a serial server 3, and the upper computer 1 sends a control instruction to control the operating states of real load modules 1 to 11 and a real load module n to 12 through the control module 6; the serial server 3 is connected with an error board of the tested meter position 1, the high-precision electric energy meters 1-9, the high-precision electric energy meters n-10 and the oscilloscope, so that the upper computer 1 can acquire the electric energy information of the standard meter 5 and the electric energy information of the high-precision electric energy meters 9 and 10; the error boards of the detected epitope 1-7 and the detected epitope m-8 are connected with the pulse output terminal of the standard meter 5, so that the upper computer 1 obtains the error information of the detected meter; the high-precision electric energy meters 1-9 and the high-precision electric energy meters n-10 are connected with the serial server 3 through RS485 lines, so that an upper computer can obtain electric energy information of the high-precision electric energy meters 9 and 10; the high-precision electric energy meters 9 and 10 are also respectively connected with corresponding real load modules, and the oscilloscope 4 is connected with the voltage and current terminals of the standard meter 5. And the oscilloscope 4 sends the monitored voltage and current information of the test loop to the upper computer 1 through a network cable.
As shown in fig. 7, the control module of the present invention includes a switch 2, the switch 2 is connected to the serial server 3 and the network relay 13, the upper computer 1 sends an instruction to the network relay 13 through the switch 2, and the network relay 13 transmits the instruction to the external circuit breaker 14 to control the power supply of each load to be turned on or off; the serial server 3 is connected with the relay module 16 through the IO controller 15, so as to control the working state of the load; the serial server 3 is also connected with the air conditioner 17 and the liquid crystal television 18 through infrared transmitters 1-20 and infrared transmitters 2-21, and controls the running states of the air conditioner 17 and the liquid crystal television 18 in an infrared mode. Each load can be started independently or in combination; the working state can be switched for the load with the working state switching.
according to the test requirements, firstly, a load operation scheme is generated, and the operation parameters comprise operation load type, operation time, start delay time, stop delay time and the like. The upper computer automatically records the type and the running time of the running load, the standard electric energy meter and the non-invasive electric energy meter measure the total power consumption, the high-precision electric energy meter and the non-invasive electric energy meter measure the power consumption of each branch load, and the non-invasive electric energy meter identifies the type of the running load. And then the upper computer acquires data information, compares the measurement data of the standard electric energy meter and the non-invasive electric energy meter, and compares the branch measurement data of the high-precision electric energy meter and the non-invasive electric energy meter. And finally, generating a test result according to the accuracy comparison of the measurement data comparison and the load type identification.
as shown in fig. 8, the detection method of the present invention has the following specific processes:
s1: connecting a plurality of high-precision electric energy meters to non-invasive load electric energy meters, wherein the high-precision electric energy meters realize the collection of the power consumption of each load branch, and the non-invasive load electric energy meters are used for acquiring the total power consumption and the electric quantity of each load branch and identifying the operation load type and the load switching time point of each load branch;
s2: and configuring a load operation scheme. And setting a load start-stop sequence, start-stop time, running time T minutes, a load running state and repeated running times through the upper computer.
S3: and configuring test parameters. The information such as the high-frequency pulse number of the standard electric energy meter, the pulse constant of the measured meter and the like is configured by the upper computer.
s4: and the upper computer reads the current electric quantity indicating value W1 of the high-precision electric energy meter.
s5: the real load operates according to a load operation scheme.
S6: after waiting for T minutes, the upper computer sends a command for reading the non-intrusive electric energy meter load identification event record (including the identified load type, the identified load switching time and the identified electric quantity W3 consumed during the load operation) and a command for reading the current electric energy indication value W2 of the high-precision electric energy meter.
S7: and judging whether the load type of the tested non-invasive electric energy meter is accurate or not. And comparing whether the load type of the load operation scheme is consistent with the load type identified by the tested non-intrusive electric energy meter. If yes, the identification is correct, otherwise, the identification is wrong.
S8: and judging whether the non-invasive electric energy meter to be tested identifies the load switching time accurately. And comparing whether the load switching time of the load operation scheme is consistent with the load switching time identified by the tested non-invasive electric energy meter. If yes, the identification is correct, otherwise, the identification is wrong.
S9: and judging the electric quantity error of the detected non-invasive electric energy meter. By the formula: (W3- (W2-W1))/(W2-W1) 100% calculation measured non-invasive electric energy meter identifies whether the electric quantity error is within an allowable range.
And calculating the electric energy error of the measured electric meter under the dynamic load according to a standard meter method of JJG 596. And the error board calculates the error of the acquired electric energy of the standard electric energy meter and the electric energy of the measured electric energy meter according to a standard meter method, and transmits the error result to the upper computer.
The load identification accuracy and the error detection are carried out on the non-invasive load electric energy meter under the real load condition by randomly combining various household appliance loads, so that the load type identification accuracy is high, and batch meter detection under the real load is realized; and the total load metering error and the sub-load metering error are respectively compared, so that whether the error of the tested non-invasive load electric energy meter, the load type identification and the load switching identification are qualified or not can be judged.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. a real load detection method of a non-intrusive load electric energy meter is characterized by comprising the following steps:
S11: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
s12: connecting a standard electric energy meter with a detected non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
S13: and comparing the accuracy of the metering data and the load type identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
2. the method as claimed in claim 1, wherein the high-precision electric energy meter collects power consumption of each load branch, and the non-intrusive load electric energy meter is used for acquiring total power consumption and electric quantity of each load branch and identifying the operation load type and load switching time point of each load branch.
3. The method as claimed in claim 1, wherein the step S12 includes the following steps:
s121: the method comprises the following steps of connecting a standard electric energy meter and a non-invasive load electric energy meter in parallel to form a voltage loop, converting power supply voltage into multiple paths of isolated voltages through high-precision isolation PT, supplying power to the standard electric energy meter and the non-invasive load electric energy meter by each path of isolated voltage, and ensuring that voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both power supply voltage;
s122: in a current loop formed by connecting the standard electric energy meter and the non-invasive load electric energy meter in series, the current on the side of the commercial power load sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the responsibility, and the consistency of the current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
4. the real load detection method of the non-invasive load electric energy meter according to claim 1, wherein the process of comparing the accuracy of the metering data and the load type identification is as follows:
comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter;
And comparing the load type and the load switching time point identified by the non-invasive electric energy meter with an actual load operation scheme set by an upper computer.
5. A batch real load detection method of a non-intrusive load electric energy meter is characterized by comprising the following steps:
S21: connecting a plurality of high-precision electric energy meters arranged on the real load branch to the detected non-invasive load electric energy meter;
S22: connecting a standard electric energy meter with at least one non-invasive load electric energy meter, wherein the standard electric energy meter is used for acquiring a true value of total power consumption;
S23: and comparing the accuracy of the measured data with the accuracy of the load type and the load switching time point identification to generate a test result, and judging whether the error, the load type identification and the load switching identification of the tested non-invasive load electric energy meter are qualified or not.
6. the method as claimed in claim 5, wherein the high-precision electric energy meter collects power consumption of each load branch, and the non-intrusive load electric energy meter is used for acquiring total power consumption and electric quantity of each load branch and identifying the operation load type and load switching time point of each load branch.
7. the method as claimed in claim 5, wherein the step S22 includes the following sub-steps:
S221: the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form a voltage loop, the voltage on the load side is changed into a plurality of paths of isolated voltages through a high-precision isolation PT, each path of voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and the voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are both the voltage on the load side;
s222: in a current loop formed by connecting the standard electric energy meter and the non-invasive load electric energy meter in series, the current on the side of the commercial power load sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the responsibility, and the consistency of the current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
8. the method as claimed in claim 5, wherein the comparison of the accuracy of the metering data and the load type identification is performed by:
Comparing the total power consumption data of the standard electric energy meter and the non-invasive electric energy meter;
And comparing the load capacity of a certain branch identified by the non-invasive electric energy meter with the branch metering data of the high-precision electric energy meter.
9. An actual load detection system of a non-invasive load electric energy meter is characterized by comprising an upper computer, a detected non-invasive load electric energy meter, a high-precision electric energy meter, a standard electric energy meter and a multi-type actual load unit; the high-precision electric energy meter connected with the real load is connected with the non-invasive load electric energy meter, and the standard electric energy meter and the non-invasive load electric energy meter form a voltage loop which is connected in parallel and a current loop which is connected in series; the upper computer is respectively connected with the detected non-invasive load electric energy meter, the high-precision electric energy meter and the standard electric energy meter and is used for carrying out accuracy comparison of the metering data and the load type identification, generating a test result and judging whether the error, the load type identification and the load switching identification of the detected non-invasive load electric energy meter are qualified or not.
10. the real load detection system of the non-invasive load electric energy meter according to claim 9, wherein the standard electric energy meter and the non-invasive load electric energy meter form a voltage loop in parallel, so that the standard electric energy meter and the non-invasive load electric energy meter are connected in parallel to form the voltage loop, the power supply voltage is changed into a plurality of paths of isolation voltages through a high-precision isolation PT, each path of isolation voltage supplies power to the standard electric energy meter and the non-invasive load electric energy meter, and voltage sampling points of the standard electric energy meter and the non-invasive load electric energy meter are guaranteed to be power supply voltage;
the standard electric energy meter and the non-invasive load electric energy meter form a current loop which is connected in series, namely the standard electric energy meter and the non-invasive load electric energy meter are connected in series to form the current loop, and the power supply current sequentially passes through the standard electric energy meter and the non-invasive load electric energy meter and then reaches the real load unit, so that the consistency of current acquisition loops of the standard electric energy meter and the non-invasive load electric energy meter is ensured.
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