CN106405482B - Nonlinear load metering precision measuring device of digital electric energy meter - Google Patents
Nonlinear load metering precision measuring device of digital electric energy meter Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a nonlinear load measurement precision measuring device of a digital electric energy meter, which comprises a nonlinear load generating unit and a measurement precision measuring unit, wherein the nonlinear load generating unit is connected with the digital electric energy meter to be measured and the measurement precision measuring unit; the measurement precision measuring unit is connected with the digital electric energy meter to be measured; the nonlinear load generating unit generates a current digital signal, a voltage digital signal and theoretical power, outputs the current digital signal and the voltage digital signal to the digital electric energy meter to be measured, and outputs the theoretical power to the measurement accuracy measuring unit; the metering precision measuring unit receives the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receives the theoretical power output by the nonlinear load generating unit, and outputs the metering precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse. The invention can realize the measurement of the metering precision of the digital electric energy meter under nonlinear load.
Description
Technical Field
The invention relates to the field of measurement accuracy testing of digital electric energy meters, in particular to a nonlinear load measurement accuracy measuring device of a digital electric energy meter.
Background
With the development of intelligent power grids, intelligent substations based on IEC61850 standard are constructed in large quantity, and digital electric energy meters based on optical fiber Ethernet are also applied in large quantity in the intelligent substations. The digital electric energy meter is different from the traditional electric energy meter, the digital electric energy meter is not provided with an analog sampling part, and IEC61850-SMV digital sampling value messages transmitted by the merging unit are received directly through the optical fiber Ethernet, so that the traditional electric energy meter testing device cannot be applied to the digital electric energy meter, and a special testing table body of the digital electric energy meter must be adopted.
The application of a large amount of power electronic industrial loads gradually causes the power grid loads to be characterized by dynamic fluctuation with time and even impact. The special test bench body for the digital electric energy meter can only measure the metering accuracy of the digital electric energy meter under the steady-state load, and the metering accuracy of the digital electric energy meter under the nonlinear load cannot be measured, so that the metering accuracy of the intelligent substation gateway is more and more affected by dynamic and impact loads. Therefore, a special device is needed to measure the metering accuracy of the digital electric energy meter under nonlinear load.
The measuring device of measurement precision under the nonlinear load of the relevant electric energy meter of present publication mainly includes:
1. the programmable unit and the silicon controlled rectifier control circuit are adopted to generate three-phase dynamic power to be transmitted to the electric energy meter, and meanwhile, the active pulse errors output by the electric energy meter are compared (application number: 201310659769.X, publication number: 103630871A, publication date: 2014.03.12, application state: china). The measuring device does not generate voltage and current signals, changes the shapes of voltage and current signals input by an external power source through the silicon controlled rectifier according to programming logic, achieves the purpose of outputting nonlinear load, and meanwhile receives active electric energy pulses input by the electric energy meter to judge metering accuracy.
2. The dynamic power signal source unit is used for producing a dynamic modulated power source signal, inputting the dynamic modulated power source signal into a tested electric energy meter, and carrying out nonlinear load test on the electric energy meter (application number: 201410613009.X, publication number: 104345294A, publication date: 2015-2-11, application state: china). The device integrates a ramp power source and an index power source unit in the equipment, directly outputs modulated voltage and current fluctuation signals, receives electric energy pulses returned by the electric energy meter to be tested, and judges the accuracy of active electric energy.
The device is mainly used for carrying out nonlinear load metering performance evaluation on the electric energy meter input by the traditional analog quantity, and cannot be applied to the digital electric energy meter needing digital message input. At present, a nonlinear load metering precision measuring device capable of independently testing a digital electric energy meter does not exist.
Disclosure of Invention
The embodiment of the invention provides a nonlinear load measurement precision measuring device of a digital electric energy meter, which is used for measuring the nonlinear load measurement precision of the digital electric energy meter.
In order to achieve the above object, an embodiment of the present invention provides a nonlinear load measurement accuracy measurement device of a digital electric energy meter, including a nonlinear load generation unit and a measurement accuracy measurement unit, wherein: the nonlinear load generating unit is connected with the digital electric energy meter to be measured and the metering precision measuring unit; the measurement precision measuring unit is connected with the digital electric energy meter to be measured; the nonlinear load generating unit is used for: generating a current digital signal, a voltage digital signal and theoretical power for measuring nonlinear load measurement precision of the measured digital electric energy meter, outputting the current digital signal and the voltage digital signal to the measured digital electric energy meter, and outputting the theoretical power to a measurement precision measuring unit; the measurement accuracy measuring unit is used for: and receiving the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receiving the theoretical power output by the nonlinear load generating unit, and outputting the nonlinear load metering precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse.
In one embodiment, the nonlinear load metering precision measuring device of the digital electric energy meter further comprises: the first control unit is connected with the nonlinear load generation unit and is used for receiving the nonlinear load model selection instruction and outputting the nonlinear load model selection instruction to the nonlinear load generation unit; the nonlinear load generating unit includes: the communication interface is used for receiving the nonlinear load model selection instruction output by the first control unit; the timer is used for starting the timer after the communication interface receives the nonlinear load model selection instruction; and the second control unit is used for selectively calling one nonlinear load model function from the nonlinear load model functions according to the nonlinear load model selection instruction after the timer is started, and generating a current digital signal, a voltage digital signal and theoretical power for measuring the nonlinear load metering precision of the digital electric energy meter.
In one embodiment, the plurality of nonlinear load model functions comprises:
first nonlinear load model function Y 1 ，Y 1 ＝[u a1 ,u b1 ,u c1 ,i a1 ,i b1 ,i c1 ]；
Wherein u is a1 For a first nonlinear load modeA phase voltage of a type function, u b1 B-phase voltage as a function of a first nonlinear load model, u c1 C-phase voltage, i, as a function of a first nonlinear load model a1 Phase a current, i, as a function of a first nonlinear load model b1 Phase B current, i, as a function of a first nonlinear load model c1 C-phase current of the first nonlinear load model function, a is a first amplitude parameter, b is a second amplitude parameter, f is waveform frequency, M is frequency proportion of waveform, U rms As the effective value of the phase voltage, I rms Is the effective value of phase current, t is time;
and a second nonlinear load model function Y 2 ，Y 2 ＝[u a2 ,u b2 ,u c2 ,i a2 ,i b2 ,i c2 ]；
Wherein u is a2 Phase A voltage as a function of a second nonlinear load model, u b2 B as a function of a second nonlinear load modelPhase voltage, u c2 C-phase voltage, i, as a function of a second nonlinear load model a2 Phase a current, i, as a function of a second nonlinear load model b2 Phase B current, i, as a function of a second nonlinear load model c2 C-phase current, a, of a second nonlinear load model function n For binary sequence, g (T-nT) is amplitude gain, T is function period, N is period number, and N is non-negative integer set;
when the first nonlinear load model function is invoked, the current digital signal comprises: a phase a current of the first nonlinear load model function, a phase B current of the first nonlinear load model function, and a phase C current of the first nonlinear load model function; the voltage digital signal includes: the a-phase voltage of the first nonlinear load model function, the B-phase voltage of the first nonlinear load model function, and the C-phase voltage of the first nonlinear load model function; when the second nonlinear load model function is invoked, the current digital signal comprises: a phase a current of the second nonlinear load model function, a phase B current of the second nonlinear load model function, and a phase C current of the second nonlinear load model function; the voltage digital signal includes: the a-phase voltage of the second nonlinear load model function, the B-phase voltage of the second nonlinear load model function, and the C-phase voltage of the second nonlinear load model function.
In one embodiment, the metrology accuracy measurement unit includes: the signal generator is used for outputting a standard current digital signal and a standard voltage digital signal with average power being theoretical power according to the theoretical power; the standard digital electric energy meter is connected with the signal generator and is used for outputting standard active electric energy pulses according to the standard current digital signal and the standard voltage digital signal; the pulse comparator is respectively connected with the measured digital electric energy meter and the standard digital electric energy meter and is used for outputting the nonlinear load metering precision of the measured digital electric energy meter according to the measured active electric energy pulse and the standard active electric energy pulse.
In one embodiment, the nonlinear load metering accuracy of the digital electric energy meter to be measured is obtained by the following formula:wherein E is the nonlinear load measurement precision of the measured digital electric energy meter, M is the standard active electric energy pulse number in a function period, N is the measured active electric energy pulse number in a function period, C b Pulse constant for standard digital electric energy meter, C m And R is a proportional function for the pulse constant of the digital electric energy meter to be tested.
In one embodiment, the scaling function R is obtained by the following formula: when the nonlinear load generating unit calls a first nonlinear load model function, the proportional function r=1; when the nonlinear load generating unit calls the second nonlinear load model function, the proportional function r=l/S, where L is a n The total number of binary numbers S is a n The binary number is the total number of 1.
In one embodiment, the nonlinear load metering precision measuring device of the digital electric energy meter further comprises: and the packet assembling unit is respectively connected with the nonlinear load generating unit and the digital electric energy meter to be tested and is used for assembling the current digital signals and the voltage digital signals to generate messages and sending the messages to the digital electric energy meter to be tested.
In one embodiment, the nonlinear load metering precision measuring device of the digital electric energy meter further comprises: the touch screen liquid crystal display is connected with the first control unit and is used for inputting a nonlinear load model selection instruction by a user, wherein the first amplitude parameter, the second amplitude parameter, the waveform frequency, the frequency proportion of the waveform, the phase voltage effective value, the phase current effective value, the binary sequence, the amplitude gain, the function period, the period number, the pulse constant of the standard digital electric energy meter and the pulse constant of the measured digital electric energy meter; the touch screen liquid crystal display is also used for: displaying nonlinear load metering precision of digital electric energy meter to be tested
According to the nonlinear load measurement precision measuring device of the digital electric energy meter, a nonlinear load generating unit outputs a current digital signal and a voltage digital signal to the digital electric energy meter to be measured, and theoretical power is output to a measurement precision measuring unit; the measuring precision measuring unit receives the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receives the theoretical power output by the nonlinear load generating unit, and outputs the nonlinear load measuring precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse, thereby realizing the measuring of the measuring precision of the digital electric energy meter under the nonlinear load.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a nonlinear load metering accuracy measurement device of a digital electric energy meter in an embodiment of the invention;
FIG. 2 is a block diagram of the structure of a measurement accuracy measurement unit in the embodiment of the present invention;
FIG. 3 is a block diagram of one embodiment of a non-linear load metering accuracy measurement device for a digital electrical energy meter in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In view of the fact that no nonlinear load measurement precision measuring device capable of independently testing the digital electric energy meter exists at present, the embodiment of the invention provides the nonlinear load measurement precision measuring device of the digital electric energy meter, wherein a nonlinear load generating unit outputs a current digital signal and a voltage digital signal to the digital electric energy meter to be tested, and theoretical power is output to a measurement precision measuring unit; the measuring precision measuring unit receives the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receives the theoretical power output by the nonlinear load generating unit, and outputs the nonlinear load measuring precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse, thereby realizing the measuring of the measuring precision of the digital electric energy meter under the nonlinear load. The present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a block diagram of a nonlinear load measurement accuracy measurement device of a digital electric energy meter according to an embodiment of the present invention, as shown in fig. 1, the nonlinear load measurement accuracy measurement device of the digital electric energy meter includes a nonlinear load generation unit and a measurement accuracy measurement unit, wherein: the nonlinear load generating unit is connected with the digital electric energy meter to be measured and the metering precision measuring unit; the measurement precision measuring unit is connected with the digital electric energy meter to be measured; the nonlinear load generating unit is used for: generating a current digital signal, a voltage digital signal and theoretical power for measuring nonlinear load measurement precision of the measured digital electric energy meter, outputting the current digital signal and the voltage digital signal to the measured digital electric energy meter, and outputting the theoretical power to a measurement precision measuring unit; the measurement accuracy measuring unit is used for: and receiving the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receiving the theoretical power output by the nonlinear load generating unit, and outputting the nonlinear load metering precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: the first control unit is connected with the nonlinear load generation unit and is used for receiving the nonlinear load model selection instruction and outputting the nonlinear load model selection instruction to the nonlinear load generation unit; the nonlinear load generating unit includes: the communication interface is used for receiving the nonlinear load model selection instruction output by the first control unit; the timer is used for starting the timer after the communication interface receives the nonlinear load model selection instruction; and the second control unit is used for selectively calling one nonlinear load model function from the nonlinear load model functions according to the nonlinear load model selection instruction after the timer is started, and generating a current digital signal, a voltage digital signal and theoretical power for measuring the nonlinear load metering precision of the digital electric energy meter.
In the implementation, a communication interface of the nonlinear load generating unit receives a nonlinear load model selection instruction output by the first control unit, and the timer starts the timer after the communication interface receives the nonlinear load model selection instruction. And after the second control unit of the nonlinear load model starts the timer, selecting and calling one nonlinear load model function from a plurality of nonlinear load model functions to generate theoretical power corresponding to the nonlinear load model function. Meanwhile, the timer interrupts according to the interrupt frequency, generates a plurality of interrupted time t, inputs the time t into the nonlinear load model function, and generates a three-phase current digital signal and a three-phase voltage digital signal corresponding to each time. The measured digital electric energy meter outputs measured active electric energy pulse according to the three-phase current digital signal and the three-phase voltage digital signal corresponding to each time; and the measurement accuracy measuring unit outputs the nonlinear load measurement accuracy of the measured digital electric energy meter according to the theoretical power and the measured active electric energy pulse.
In an embodiment, the plurality of nonlinear load model functions may include: first nonlinear load model function Y 1 ，Y 1 ＝[u a1 ,u b1 ,u c1 ,i a1 ,i b1 ,i c 1]；
Wherein u is a1 Phase A voltage as a function of a first nonlinear load model, u b1 B-phase voltage as a function of a first nonlinear load model, u c1 C-phase voltage, i, as a function of a first nonlinear load model a1 Phase a current, i, as a function of a first nonlinear load model b1 Phase B current, i, as a function of a first nonlinear load model c1 C-phase current of the first nonlinear load model function, a is a first amplitude parameter, b is a second amplitude parameter, f is waveform frequency, M is frequency proportion of waveform, U rms As the effective value of the phase voltage, I rms Is the effective value of phase current, t is time;
and a second nonlinear load model function Y 2 ，Y 2 ＝[u a2 ,u b2 ,u c2 ,i a2 ,i b2 ,i c2 ]；
Wherein u is a2 Phase A voltage as a function of a second nonlinear load model, u b2 B-phase voltage as a function of a second nonlinear load model, u c2 C-phase voltage, i, as a function of a second nonlinear load model a2 Phase a current, i, as a function of a second nonlinear load model b2 Phase B current, i, as a function of a second nonlinear load model c2 C-phase current, a, of a second nonlinear load model function n For binary sequence, g (T-nT) is amplitude gain, T is function period, N is period number, and N is non-negative integer set;
when the first nonlinear load model function is invoked, the current digital signal may include: a phase a current of the first nonlinear load model function, a phase B current of the first nonlinear load model function, and a phase C current of the first nonlinear load model function; the voltage digital signal may include: the a-phase voltage of the first nonlinear load model function, the B-phase voltage of the first nonlinear load model function, and the C-phase voltage of the first nonlinear load model function;
when the second nonlinear load model function is invoked, the current digital signal may include: a phase a current of the second nonlinear load model function, a phase B current of the second nonlinear load model function, and a phase C current of the second nonlinear load model function; the voltage digital signal may include: the a-phase voltage of the second nonlinear load model function, the B-phase voltage of the second nonlinear load model function, and the C-phase voltage of the second nonlinear load model function.
Fig. 2 is a block diagram of the structure of the measurement accuracy measuring unit in the embodiment of the present invention. As shown in fig. 2, the measurement accuracy measurement unit may include: the signal generator is used for outputting a standard current digital signal and a standard voltage digital signal with average power being theoretical power according to the theoretical power; the standard digital electric energy meter is connected with the signal generator and is used for outputting standard active electric energy pulses according to the standard current digital signal and the standard voltage digital signal; the pulse comparator is respectively connected with the measured digital electric energy meter and the standard digital electric energy meter and is used for outputting the nonlinear load metering precision of the measured digital electric energy meter according to the measured active electric energy pulse and the standard active electric energy pulse.
When the method is implemented, after receiving the theoretical power output by the nonlinear load generating unit, the signal generator generates a three-phase standard current digital signal and a three-phase standard voltage digital signal according to the theoretical power, wherein the average power is equal to the theoretical power; the standard digital electric energy meter outputs standard active electric energy pulse according to the three-phase standard current digital signal and the three-phase standard voltage digital signal; the pulse comparator receives the measured active power pulse and the standard active power pulse, obtains the standard active power pulse number in a function period according to the standard active power pulse, obtains the measured active power pulse number in a function period according to the measured active power pulse, and obtains the nonlinear load metering precision of the measured digital electric energy meter through the following formula:
wherein E is the nonlinear load measurement precision of the measured digital electric energy meter, M is the standard active electric energy pulse number in a function period, N is the measured active electric energy pulse number in a function period, C b Pulse constant for standard digital electric energy meter, C m And R is a proportional function for the pulse constant of the digital electric energy meter to be tested.
In an embodiment, the scaling function R may be obtained by the following formula: when the nonlinear load generating unit calls a first nonlinear load model function, the proportional function r=1; when the nonlinear load generating unit calls the secondIn the case of a nonlinear load model function, the ratio function r=l/S, where L is a n The total number of binary numbers S is a n The binary number is the total number of 1.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: and the packet assembling unit is respectively connected with the nonlinear load generating unit and the digital electric energy meter to be tested and is used for assembling the current digital signals and the voltage digital signals to generate messages and sending the messages to the digital electric energy meter to be tested.
In specific implementation, the packet unit may be SMV (Sampled Measured Value) packet unit, and according to IEC61850 standard 9-1/9-2 protocol, the current digital signal and the voltage digital signal inputted to the packet unit are packetized to generate a network traffic acquisition value message meeting the standard requirement, and the network physical layer protocol is invoked to send the message to the digital electric energy meter to be tested. The sampling frequency of the SMV message is equal to the interrupt frequency of the timer, and the frequency of 4KHz can be adopted.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: the touch screen liquid crystal display is connected with the first control unit and is used for inputting a nonlinear load model selection instruction by a user, wherein the first amplitude parameter, the second amplitude parameter, the waveform frequency, the frequency proportion of the waveform, the phase voltage effective value, the phase current effective value, the binary sequence, the amplitude gain, the function period, the period number, the pulse constant of the standard digital electric energy meter and the pulse constant of the measured digital electric energy meter; the touch screen liquid crystal display is also used for: and displaying the nonlinear load metering precision of the measured digital electric energy meter.
FIG. 3 is a block diagram of one embodiment of a non-linear load metering accuracy measurement device for a digital electrical energy meter in accordance with an embodiment of the present invention. As shown in fig. 3, the nonlinear load generating unit and the packet unit may be implemented by a digital signal processor, the signal generator, the first control unit and the standard digital electric energy meter may be implemented by a central processing unit, and the pulse comparator may be implemented by a Field Programmable Gate Array (FPGA) unit. The digital signal processor may be a 32-bit 400MHz digital signal processor, and the central processor may include a 200MHz ARM9 processor.
In the embodiment, the digital signal processor can be connected with the central processing unit through an SPI bus, the central processing unit can be respectively connected with the touch screen liquid crystal display and the field programmable gate array unit through a parallel bus, and the field programmable gate array unit can be connected with the digital electric energy meter to be tested through an IO interface.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: an Ethernet controller connected with the digital signal processor; and one or any combination of a plurality of optical fiber interfaces, a plurality of RJ45 interfaces and a plurality of single-mode optical fiber interfaces which are respectively connected with the Ethernet controller is used for outputting a current digital signal and a voltage digital signal to the tested digital electric energy meter. The optical fiber interface can be a 10/100BASE-FX optical fiber interface, and the single-mode optical fiber interface can be an FT3 protocol single-mode optical fiber interface.
In the specific implementation, a user inputs a nonlinear load model selection instruction through a touch screen liquid crystal display, and the touch screen liquid crystal display transmits the data input by the user to a central processing unit. A first control unit in the central processing unit outputs a nonlinear load model selection instruction to the digital signal processor. And a nonlinear load generating unit in the digital signal processor generates a current digital signal, a voltage digital signal and theoretical power for measuring the nonlinear load metering precision of the digital electric energy meter to be measured, outputs the current digital signal and the voltage digital signal to the packaging unit and outputs the theoretical power to the central processing unit. The packet unit generates a message, and invokes the driving of the Ethernet controller, and outputs the message to the tested digital electric energy meter in parallel through one or any combination of a plurality of optical fiber interfaces, a plurality of RJ45 interfaces and a plurality of single-mode fiber interfaces. The signal generator in the central processing unit outputs a standard current digital signal and a standard voltage digital signal according to the theoretical power; and the standard digital electric energy meter is internally arranged in the central processing unit and outputs standard active electric energy pulses to the field programmable gate array unit according to the standard current digital signals and the standard voltage digital signals. The field programmable gate array unit receives standard active power pulses and also receives the detected active power pulses output by the detected digital electric energy meter according to the current digital signals and the voltage digital signals; the pulse comparator is used for calculating the nonlinear load metering precision of the measured digital electric energy meter according to the standard active electric energy pulse and the measured active electric energy pulse, and returning the nonlinear load metering precision to the central processing unit, and the central processing unit returns the nonlinear load metering precision of the measured digital electric energy meter to the touch screen liquid crystal display for display.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: the Nand flash memory and/or the ferroelectric memory are connected with the central processing unit through the parallel bus and are used for storing current digital signals, voltage digital signals, theoretical power, measured active electric energy pulses, standard current digital signals, standard voltage digital signals, standard active electric energy pulses and nonlinear load metering precision of the digital electric energy meter.
In an embodiment, the nonlinear load measurement accuracy measurement device of the digital electric energy meter may further include: and the expansion communication unit is connected with the central processing unit through a serial bus and is used for transmitting the nonlinear load metering precision of the digital electric energy meter. The extended communication unit may include: one or any combination of an RS485 interface, an RS232 interface and an RJ485 interface.
In summary, according to the nonlinear load measurement precision measuring device of the digital electric energy meter, provided by the embodiment of the invention, the nonlinear load generating unit outputs a current digital signal and a voltage digital signal to the digital electric energy meter to be measured, and theoretical power is output to the measurement precision measuring unit; the measuring precision measuring unit receives the measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receives the theoretical power output by the nonlinear load generating unit, and outputs the nonlinear load measuring precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse, thereby realizing the measuring of the measuring precision of the digital electric energy meter under the nonlinear load. The invention can also transmit the current digital signal and the voltage digital signal to the digital electric energy meter to be measured through the multipath interfaces, can measure a plurality of digital electric energy meters with different interface types at the same time, and improves the measurement efficiency.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The nonlinear load measurement precision measuring device of the digital electric energy meter is characterized by comprising a nonlinear load generating unit and a measurement precision measuring unit, wherein:
the nonlinear load generating unit is connected with the digital electric energy meter to be measured and the metering precision measuring unit; the measurement precision measuring unit is connected with the digital electric energy meter to be measured;
the nonlinear load generating unit is used for: generating a current digital signal, a voltage digital signal and theoretical power for measuring nonlinear load measurement precision of the measured digital electric energy meter, outputting the current digital signal and the voltage digital signal to the measured digital electric energy meter, and outputting the theoretical power to a measurement precision measuring unit;
the measurement accuracy measuring unit is used for: receiving a measured active power pulse output by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receiving theoretical power output by the nonlinear load generating unit, and outputting nonlinear load metering precision of the measured digital electric energy meter according to the theoretical power and the measured active power pulse;
the nonlinear load metering precision measuring device of the digital electric energy meter further comprises:
the first control unit is connected with the nonlinear load generation unit and is used for receiving the nonlinear load model selection instruction and outputting the nonlinear load model selection instruction to the nonlinear load generation unit;
the nonlinear load generating unit includes:
the communication interface is used for receiving the nonlinear load model selection instruction output by the first control unit;
the timer is used for starting the timer after the communication interface receives the nonlinear load model selection instruction;
and the second control unit is used for selectively calling one nonlinear load model function from the nonlinear load model functions according to the nonlinear load model selection instruction after the timer is started, and generating a current digital signal, a voltage digital signal and theoretical power for measuring the nonlinear load metering precision of the digital electric energy meter.
2. The device for measuring nonlinear load measurement accuracy of a digital electric energy meter according to claim 1, wherein the plurality of nonlinear load model functions comprises:
first nonlinear load model function Y 1 ，Y 1 ＝[u a1 ,u b1 ,u c1 ,i a1 ,i b1 ,i c1 ]；
Wherein u is a1 Phase A voltage as a function of a first nonlinear load model, u b1 B-phase voltage as a function of a first nonlinear load model, u c1 C-phase voltage, i, as a function of a first nonlinear load model a1 Phase a current, i, as a function of a first nonlinear load model b1 Phase B current, i, as a function of a first nonlinear load model c1 C-phase current of the first nonlinear load model function, a is a first amplitude parameter, b is a second amplitude parameter, f is waveform frequency, M is frequency proportion of waveform, U rms As the effective value of the phase voltage, I rms Is the effective value of phase current, t is time;
and a second nonlinear load model function Y 2 ，Y 2 ＝[u a2 ,u b2 ,u c2 ,i a2 ,i b2 ,i c2 ]；
Wherein u is a2 Phase A voltage as a function of a second nonlinear load model, u b2 B-phase voltage as a function of a second nonlinear load model, u c2 C-phase voltage, i, as a function of a second nonlinear load model a2 Phase a current, i, as a function of a second nonlinear load model b2 Phase B current, i, as a function of a second nonlinear load model c2 C-phase current, a, of a second nonlinear load model function n For binary sequence, g (T-nT) is amplitude gain, T is function period, N is period number, and N is non-negative integer set;
when the first nonlinear load model function is invoked, the current digital signal comprises:
a phase a current of the first nonlinear load model function, a phase B current of the first nonlinear load model function, and a phase C current of the first nonlinear load model function;
the voltage digital signal includes:
the a-phase voltage of the first nonlinear load model function, the B-phase voltage of the first nonlinear load model function, and the C-phase voltage of the first nonlinear load model function;
when the second nonlinear load model function is invoked, the current digital signal comprises:
a phase a current of the second nonlinear load model function, a phase B current of the second nonlinear load model function, and a phase C current of the second nonlinear load model function;
the voltage digital signal includes:
the a-phase voltage of the second nonlinear load model function, the B-phase voltage of the second nonlinear load model function, and the C-phase voltage of the second nonlinear load model function.
3. The nonlinear load measurement accuracy measurement device of a digital electric energy meter according to claim 2, wherein the measurement accuracy measurement unit includes:
the signal generator is used for outputting a standard current digital signal and a standard voltage digital signal with average power being theoretical power according to the theoretical power;
the standard digital electric energy meter is connected with the signal generator and is used for outputting standard active electric energy pulses according to the standard current digital signal and the standard voltage digital signal;
the pulse comparator is respectively connected with the measured digital electric energy meter and the standard digital electric energy meter and is used for outputting the nonlinear load metering precision of the measured digital electric energy meter according to the measured active electric energy pulse and the standard active electric energy pulse.
4. The nonlinear load measurement accuracy measurement device of the digital electric energy meter according to claim 3, wherein the nonlinear load measurement accuracy of the digital electric energy meter to be measured is obtained by the following formula:
wherein E is the nonlinear load measurement precision of the measured digital electric energy meter, M is the standard active electric energy pulse number in a function period, N is the measured active electric energy pulse number in a function period, C b Pulse constant for standard digital electric energy meter, C m And R is a proportional function for the pulse constant of the digital electric energy meter to be tested.
5. The device for measuring the nonlinear load metering accuracy of the digital electric energy meter according to claim 4, wherein the proportional function R is obtained by the following formula:
when the nonlinear load generating unit calls a first nonlinear load model function, the proportional function r=1;
when the nonlinear load generating unit calls the second nonlinear load model function, the scaling function r=l/S,
wherein L is a n The total number of binary numbers S is a n The binary number is the total number of 1.
6. The device for measuring nonlinear load metering accuracy of a digital electric energy meter according to claim 4, further comprising:
and the packet assembling unit is respectively connected with the nonlinear load generating unit and the digital electric energy meter to be tested and is used for assembling the current digital signals and the voltage digital signals to generate messages and sending the messages to the digital electric energy meter to be tested.
7. The device for measuring nonlinear load metering accuracy of a digital electric energy meter according to claim 4, further comprising:
the touch screen liquid crystal display is connected with the first control unit and is used for inputting a nonlinear load model selection instruction by a user, wherein the first amplitude parameter, the second amplitude parameter, the waveform frequency, the frequency proportion of the waveform, the phase voltage effective value, the phase current effective value, the binary sequence, the amplitude gain, the function period, the period number, the pulse constant of the standard digital electric energy meter and the pulse constant of the measured digital electric energy meter;
the touch screen liquid crystal display is also used for: and displaying the nonlinear load metering precision of the measured digital electric energy meter.
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| CN110471017A (en) * | 2019-09-17 | 2019-11-19 | 上海贝岭股份有限公司 | Power standard source, metering chip and metering device |
| CN110824977B (en) * | 2019-09-24 | 2023-06-27 | 广东科瑞德电气科技有限公司 | Signal sampling method, MCU core processing module and power distribution automation terminal |
| CN112748388A (en) * | 2019-10-29 | 2021-05-04 | 国网宁夏电力有限公司电力科学研究院 | Test system and test method for intelligent electric meter |
| CN110940855B (en) * | 2019-11-11 | 2022-07-15 | 国网安徽省电力有限公司电力科学研究院 | Electric energy metering method and device suitable for three-second wiring of intelligent substation |
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