CN106405482A - Digital electric energy meter nonlinear load measurement precision measuring device - Google Patents

Abstract

The invention provides a digital electric energy meter nonlinear load measurement precision measuring device, which comprises a nonlinear load generating unit and a measurement precision measuring unit, wherein the nonlinear load generating unit is connected with a measured digital electric energy meter and the measurement precision measuring unit; the measurement precision measuring unit is connected with the measured digital electric energy meter; 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 measured digital electric energy meter and outputs the theoretical power to the measurement precision measuring unit; and the measurement precision measuring unit receives a measured active electric energy pulse outputted by the measured digital electric energy meter according to the current digital signal and the voltage digital signal, receives the theoretical power outputted by the nonlinear load generating unit, and outputs the measurement precision of the measured digital electric energy meter according to the theoretical power and the measured active electric energy pulse. The device provided by the invention can realize measurement for the measurement precision of the digital electric energy meter under a nonlinear load.

Description

The nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter

Technical field

The present invention relates to digitalized electrical energy meter measuring accuracy field tests, in particular it relates to a kind of digitalized electrical energy meter Nonlinear-load measuring accuracy measurement apparatus.

Background technology

With the development of intelligent grid, intelligent substation in IEC61850 standard base for the framework is built in a large number, is based on The digitalized electrical energy meter of fiber optic Ethernet is also widely applied in intelligent substation.It is different from traditional electric energy meter, digitized Electric energy meter does not have analog quantity sampling section, but directly receives the incoming IEC61850-SMV of combining unit by fiber optic Ethernet Digitized sampling value message, therefore, traditional testing device for energy meter also cannot be applied to digitalized electrical energy meter it is necessary to adopt number The special test stage body of word electric energy meter.

And the application of a large amount of power electronics industrial load is so that network load gradually assumes dynamic fluctuation in time, or even The feature of impact.Because digitalized electrical energy meter special test stage body can only measure meter under steady state load for the digitalized electrical energy meter Accuracy of measurement, its measuring accuracy under nonlinear-load cannot measure so that the measuring accuracy at intelligent substation critical point be subject to dynamic, The impact of impact load is increasing.It is therefore desirable to have special device, come to digitalized electrical energy meter under nonlinear-load Measuring accuracy measure.

Under the related electric energy meter nonlinear-load announced at present, the measurement apparatus of measuring accuracy mainly include：

1st, adopt programmable unit and silicon controlled control circuit, generate three phase dynamic power be conveyed to electric energy meter, simultaneously than Active pulse error (application number to electric energy meter output：201310659769.X, publication number：103630871A, publication date： 2014.03.12, applicant country：China).This measurement apparatus itself do not generate voltage and current signal, but by controllable silicon according to Programmed logic, changes voltage and the current signal shape of external power source input, to reach the purpose of output nonlinear load, with When accept electric energy meter input active energy pulse, carry out measuring accuracy judgement.

2nd, pass through active power signal source unit, the tested electric energy meter of power source signal input of Production development modulation, carry out Electric energy meter nonlinear-load tests (application number：201410613009.X, publication number：104345294A, publication date：2015-2- 11, applicant country：China).This device is in the integrated oblique line power source of device interior and index power source unit, directly defeated Go out the voltage modulating and current fluctuation signal, accept the electrical energy pulse that tested electric energy meter returns simultaneously, carry out active energy essence Degree judges.

The electric energy meter that said apparatus input mainly for traditional analog amount carries out nonlinear-load metering performance evaluation and test, and no Method is applied to the digitalized electrical energy meter of digitized message input.Still not having at present being capable of independent test digitalized electrical energy meter Nonlinear-load measuring accuracy measurement apparatus.

Content of the invention

The embodiment of the present invention provides a kind of nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter, in order to measure The nonlinear-load measuring accuracy of digitalized electrical energy meter.

To achieve these goals, the embodiment of the present invention provides a kind of nonlinear-load measuring accuracy of digitalized electrical energy meter Measurement apparatus, including nonlinear-load signal generating unit and measuring accuracy measuring unit, wherein：Nonlinear-load signal generating unit and quilt Survey digitalized electrical energy meter and measuring accuracy measuring unit connects；Measuring accuracy measuring unit is connected with measured number electric energy meter； Nonlinear-load signal generating unit is used for：Generate the electric current of the nonlinear-load measuring accuracy measurement for measured number electric energy meter Digital signal, voltage digital signal and theoretical power (horse-power), to measured number electric energy meter output current numeral signal and voltage digital Signal, exports theoretical power (horse-power) to measuring accuracy measuring unit；Measuring accuracy measuring unit is used for：Receive measured number electric energy meter According to the tested active energy pulse of current digital signal and voltage digital signal output, receive nonlinear-load signal generating unit defeated The theoretical power (horse-power) going out, according to theoretical power (horse-power) and tested active energy pulse, exports the nonlinear-load of measured number electric energy meter Measuring accuracy.

Wherein in a kind of embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter also include：With The first control unit that nonlinear-load signal generating unit connects, for receiving nonlinear-load model selection instruction, to non-linear Load signal generating unit output nonlinear load model selection instruction；Nonlinear-load signal generating unit includes：Communication interface, is used for connecing Receive the nonlinear-load model selection instruction of the first control unit output；Intervalometer, non-linear negative for receiving in communication interface After lotus model selection instruction, start intervalometer；Second control unit, for after starting intervalometer, according to nonlinear-load mould Type selection instruction, from multiple nonlinear-load pattern functions, one nonlinear-load pattern function of Selection and call, generates and is used for The current digital signal of nonlinear-load measuring accuracy measurement of digitalized electrical energy meter, voltage digital signal and theoretical power (horse-power).

Wherein in a kind of embodiment, multiple nonlinear-load pattern functions include：

First nonlinear-load pattern function Y₁, Y₁=[U_a1,U_b1,U_c1,I_a1,I_b1,I_c1]；

Wherein, u_a1For the A phase voltage of the first nonlinear-load pattern function, u_b1For the first nonlinear-load pattern function B phase voltage, u_c1For the C phase voltage of the first nonlinear-load pattern function, i_a1A for the first nonlinear-load pattern function Phase current, i_b1For the B phase current of the first nonlinear-load pattern function, i_c1The C phase of the first nonlinear-load pattern function is electric Stream, a is first amplitude parameter, and b is the second magnitude parameters, and f is waveform frequency, and M is the frequency proportions of waveform, U_rmsFor phase voltage Virtual value, I_rmsFor phase current virtual value, t is the time；

And, the second nonlinear-load pattern function Y₂, Y₂=[U_a2,U_b2,U_c2,I_a2,I_b2,I_c2]；

Wherein, u_a2For the A phase voltage of the second nonlinear-load pattern function, u_b2For the second nonlinear-load pattern function B phase voltage, u_c2For the C phase voltage of the second nonlinear-load pattern function, i_a2A for the second nonlinear-load pattern function Phase current, i_b2For the B phase current of the second nonlinear-load pattern function, i_c2The C phase of the second nonlinear-load pattern function is electric Stream, a_nFor binary sequence, g (t-nT) is amplitude gain, and T is function cycle, and n is periodicity, and N is set of nonnegative integer；

When calling the first nonlinear-load pattern function, current digital signal includes：First nonlinear-load model letter The C phase current of the A phase current, the B phase current of the first nonlinear-load pattern function and the first nonlinear-load pattern function of number； Voltage digital signal includes：The A phase voltage of the first nonlinear-load pattern function, the B phase of the first nonlinear-load pattern function Voltage and the C phase voltage of the first nonlinear-load pattern function；When calling the second nonlinear-load pattern function, current digital Signal includes：The A phase current of the second nonlinear-load pattern function, the B phase current of the second nonlinear-load pattern function and The C phase current of two nonlinear-load pattern functions；Voltage digital signal includes：The A phase of the second nonlinear-load pattern function is electric The C phase voltage of pressure, the B phase voltage of the second nonlinear-load pattern function and the second nonlinear-load pattern function.

Wherein in a kind of embodiment, measuring accuracy measuring unit includes：Signal generator, for according to theoretical power (horse-power), Output mean power is normalized current digital signal and the normal voltage digital signal of theoretical power (horse-power)；It is connected with signal generator Standard digital electric energy meter, for according to normalized current digital signal and normal voltage digital signal, outputting standard active energy Pulse；The pulse comparative device being connected with measured number electric energy meter, standard digital electric energy meter respectively, for according to tested active Electrical energy pulse and standard active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter.

The nonlinear-load metering essence of measured number electric energy meter wherein in a kind of embodiment, is obtained by equation below Degree：Wherein, E is the nonlinear-load measuring accuracy of measured number electric energy meter, and M is a letter Standard active energy umber of pulse in one number time, N is the tested active energy umber of pulse in a function cycle, C_bFor standard digital Change the meter constant of electric energy meter, C_mFor the meter constant of measured number electric energy meter, R is proportion function.

Wherein in a kind of embodiment, proportion function R is obtained by equation below：When nonlinear-load signal generating unit is called During the first nonlinear-load pattern function, proportion function R=1；When nonlinear-load signal generating unit calls the second nonlinear-load During pattern function, proportion function R=L/S, wherein, L is a_nThe sum of middle binary number, S is a_nMiddle binary number is 1 sum.

Wherein in a kind of embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter also include：Point The group bag unit not being connected with nonlinear-load signal generating unit and measured number electric energy meter, for by current digital signal and electricity Pressure data signal groups bag generates message, and message is sent to measured number electric energy meter.

Wherein in a kind of embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter also include：With The touch screen LCD that first control unit connects, for for user input nonlinear-load model selection instruction, first Magnitude parameters, the second magnitude parameters, waveform frequency, the frequency proportions of waveform, phase voltage virtual value, phase current virtual value, two enter Sequence processed, amplitude gain, function cycle, periodicity, the meter constant of standard digital electric energy meter and measured number electric energy meter Meter constant；Touch screen LCD is additionally operable to：The nonlinear-load measuring accuracy of display measured number electric energy meter

The nonlinear-load measuring accuracy measurement apparatus of the digitalized electrical energy meter of the embodiment of the present invention, nonlinear-load generates Unit, to measured number electric energy meter output current numeral signal and voltage digital signal, exports reason to measuring accuracy measuring unit By power；Measuring accuracy measuring unit receives measured number electric energy meter and is exported according to current digital signal and voltage digital signal Tested active energy pulse, receive the theoretical power (horse-power) of nonlinear-load signal generating unit output, according to theoretical power (horse-power) with tested have Work(electrical energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter, thus realize digitalized electrical energy meter is existed The measurement of the measuring accuracy under nonlinear-load.

Brief description

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below In required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these Figure obtains other accompanying drawings.

Fig. 1 is the structural frames of the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter in the embodiment of the present invention Figure；

Fig. 2 is the structured flowchart of measuring accuracy measuring unit in the embodiment of the present invention；

Fig. 3 is that the nonlinear-load measuring accuracy measurement apparatus one of which of digitalized electrical energy meter in the embodiment of the present invention is real Apply the structured flowchart of example.

Specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work Embodiment, broadly falls into the scope of protection of the invention.

In view of still not having the nonlinear-load measuring accuracy measurement apparatus being capable of independent test digitalized electrical energy meter at present, The embodiment of the present invention provides a kind of nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter, and nonlinear-load generates single Unit, to measured number electric energy meter output current numeral signal and voltage digital signal, exports theoretical to measuring accuracy measuring unit Power；Measuring accuracy measuring unit receives what measured number electric energy meter exported according to current digital signal and voltage digital signal Tested active energy pulse, receives the theoretical power (horse-power) of nonlinear-load signal generating unit output, according to theoretical power (horse-power) and tested active Electrical energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter, thus realize to digitalized electrical energy meter non- The measurement of the measuring accuracy under linear load.Below in conjunction with accompanying drawing, the present invention is described in detail.

Fig. 1 is the structural frames of the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter in the embodiment of the present invention Figure, as shown in figure 1, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter, including nonlinear-load signal generating unit With measuring accuracy measuring unit, wherein：Nonlinear-load signal generating unit and measured number electric energy meter and measuring accuracy measure single Unit connects；Measuring accuracy measuring unit is connected with measured number electric energy meter；Nonlinear-load signal generating unit is used for：Generate and be used for The current digital signal of nonlinear-load measuring accuracy measurement of measured number electric energy meter, voltage digital signal and theoretical work( Rate, to measured number electric energy meter output current numeral signal and voltage digital signal, exports reason to measuring accuracy measuring unit By power；Measuring accuracy measuring unit is used for：Receive measured number electric energy meter to be believed according to current digital signal and voltage digital The tested active energy pulse of number output, receives the theoretical power (horse-power) of nonlinear-load signal generating unit output, according to theoretical power (horse-power) and Tested active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：With non-linear The first control unit that load signal generating unit connects, for receiving nonlinear-load model selection instruction, to nonlinear-load life Become unit output nonlinear load model selection instruction；Nonlinear-load signal generating unit includes：Communication interface, for receiving first The nonlinear-load model selection instruction of control unit output；Intervalometer, for receiving nonlinear-load model in communication interface After selection instruction, start intervalometer；Second control unit, for, after starting intervalometer, selecting according to nonlinear-load model Instruction, from multiple nonlinear-load pattern functions, one nonlinear-load pattern function of Selection and call, generates for digitized The current digital signal of nonlinear-load measuring accuracy measurement of electric energy meter, voltage digital signal and theoretical power (horse-power).

When being embodied as, the communication interface of nonlinear-load signal generating unit receives the non-linear negative of the first control unit output Lotus model selection instruction, intervalometer, after communication interface receives nonlinear-load model selection instruction, starts intervalometer.Non-linear , after starting intervalometer, from multiple nonlinear-load pattern functions, Selection and call one is non-for second control unit of load model Linear load pattern function, generate to should nonlinear-load pattern function theoretical power (horse-power).Meanwhile, intervalometer is according to interruption frequency Rate is interrupted, the time t having no progeny during generation is multiple, is entered in this nonlinear-load pattern function, generates per a period of time Between corresponding three-phase current digital signal and three-phase voltage digital signal.Measured number electric energy meter is corresponding according to each time Three-phase current digital signal and three-phase voltage digital signal, export tested active energy pulse；Measuring accuracy measuring unit according to Theoretical power (horse-power) and tested active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter.

In embodiment, multiple nonlinear-load pattern functions can include：First nonlinear-load pattern function Y₁, Y₁= [U_a1,U_b1,U_c1,I_a1,I_b1,I_c1]；

Wherein, u_a1For the A phase voltage of the first nonlinear-load pattern function, u_b1For the first nonlinear-load pattern function B phase voltage, u_c1For the C phase voltage of the first nonlinear-load pattern function, i_a1A for the first nonlinear-load pattern function Phase current, i_b1For the B phase current of the first nonlinear-load pattern function, i_c1The C phase of the first nonlinear-load pattern function is electric Stream, a is first amplitude parameter, and b is the second magnitude parameters, and f is waveform frequency, and M is the frequency proportions of waveform, U_rmsFor phase voltage Virtual value, I_rmsFor phase current virtual value, t is the time；

And, the second nonlinear-load pattern function Y₂, Y₂=[U_a2,U_b2,U_c2,I_a2,I_b2,I_c2]；

Wherein, u_a2For the A phase voltage of the second nonlinear-load pattern function, u_b2For the second nonlinear-load pattern function B phase voltage, u_c2For the C phase voltage of the second nonlinear-load pattern function, i_a2A for the second nonlinear-load pattern function Phase current, i_b2For the B phase current of the second nonlinear-load pattern function, i_c2The C phase of the second nonlinear-load pattern function is electric Stream, a_nFor binary sequence, g (t-nT) is amplitude gain, and T is function cycle, and n is periodicity, and N is set of nonnegative integer；

When calling the first nonlinear-load pattern function, current digital signal can include：First nonlinear-load mould The C phase of the A phase current of type function, the B phase current of the first nonlinear-load pattern function and the first nonlinear-load pattern function Electric current；Voltage digital signal can include：The A phase voltage of the first nonlinear-load pattern function, the first nonlinear-load model The B phase voltage of function and the C phase voltage of the first nonlinear-load pattern function；

When calling the second nonlinear-load pattern function, current digital signal can include：Second nonlinear-load mould The C phase of the A phase current of type function, the B phase current of the second nonlinear-load pattern function and the second nonlinear-load pattern function Electric current；Voltage digital signal can include：The A phase voltage of the second nonlinear-load pattern function, the second nonlinear-load model The B phase voltage of function and the C phase voltage of the second nonlinear-load pattern function.

Fig. 2 is the structured flowchart of measuring accuracy measuring unit in the embodiment of the present invention.As shown in Fig. 2 measuring accuracy measurement Unit can include：Signal generator, for according to theoretical power (horse-power), exporting the normalized current numeral that mean power is theoretical power (horse-power) Signal and normal voltage digital signal；The standard digital electric energy meter being connected with signal generator, for according to standard electric fluxion Word signal and normal voltage digital signal, outputting standard active energy pulse；Respectively with measured number electric energy meter, standard digital Change the pulse comparative device that electric energy meter connects, for according to tested active energy pulse and standard active energy pulse, exporting tested The nonlinear-load measuring accuracy of digitalized electrical energy meter.

When being embodied as, signal generator receive nonlinear-load signal generating unit output theoretical power (horse-power) after, foundation Theoretical power (horse-power) generates three-phase normalized current digital signal and three-phase normal voltage digital signal, its mean power and theoretical power (horse-power) phase Deng；Standard digital electric energy meter has according to three-phase normalized current digital signal and three-phase normal voltage digital signal, outputting standard Work(electrical energy pulse；Pulse comparative device receives tested active energy pulse and standard active energy pulse, according to standard active energy Pulse obtains the standard active energy umber of pulse in a function cycle, is obtained in a function cycle according to tested active energy pulse Tested active energy umber of pulse, obtain the nonlinear-load measuring accuracy of measured number electric energy meter by equation below：

Wherein, E is the nonlinear-load measuring accuracy of measured number electric energy meter, and M is that the standard in a function cycle has Work(electrical energy pulse number, N is the tested active energy umber of pulse in a function cycle, C_bNormal for the pulse of standard digital electric energy meter Number, C_mFor the meter constant of measured number electric energy meter, R is proportion function.

In embodiment, proportion function R can be obtained by equation below：When nonlinear-load signal generating unit call first non- During linear load pattern function, proportion function R=1；When nonlinear-load signal generating unit calls the second nonlinear-load model letter During number, proportion function R=L/S, wherein, L is a_nThe sum of middle binary number, S is a_nMiddle binary number is 1 sum.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：Respectively with non- The group bag unit that linear load signal generating unit and measured number electric energy meter connect, for by current digital signal and voltage digital Signal group bag generates message, and message is sent to measured number electric energy meter.

When being embodied as, group bag unit can organize bag unit, foundation for SMV (Sampled Measured Value) IEC61850 standard 9-1/9-2 agreement, the current digital signal to input group bag unit and voltage digital signal group bag generate symbol The network that standardization requires is handed over and is adopted value message, and calls network physical layer protocol to send this message to measured number electric energy Table.Wherein, the sample frequency of SMV message is equal with timer interruption frequency, all can adopt the frequency of 4KHz.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：With the first control The touch screen LCD that unit processed connects, for for user input nonlinear-load model selection instruction, first amplitude is joined Number, the second magnitude parameters, waveform frequency, the frequency proportions of waveform, phase voltage virtual value, phase current virtual value, binary sequence, Amplitude gain, function cycle, periodicity, the meter constant of standard digital electric energy meter and measured number electric energy meter pulse normal Number；Touch screen LCD is additionally operable to：The nonlinear-load measuring accuracy of display measured number electric energy meter.

Fig. 3 is that the nonlinear-load measuring accuracy measurement apparatus one of which of digitalized electrical energy meter in the embodiment of the present invention is real Apply the structured flowchart of example.As shown in figure 3, nonlinear-load signal generating unit and group bag unit can adopt digital signal processor Realize, signal generator, the first control unit and standard digital electric energy meter can be realized using central processing unit, pulse ratio Device can be realized using field programmable gate array (FPGA) unit.Wherein, digital signal processor can adopt 32 The digital signal processor of 400MHz, central processing unit can include the ARM9 processor of 200MHz.

In embodiment, digital signal processor can be connected with central processing unit by spi bus, and central processing unit is permissible It is connected with touch screen LCD and field programmable gate array unit respectively by parallel bus, field programmable gate array Unit can be connected with measured number electric energy meter by I/O interface.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：With numeral letter The ethernet controller that number processor connects；Multiple optical fiber interfaces of being connected with ethernet controller respectively, multiple RJ45 interface With the one of of multiple single-mode fiber interfaces or combination in any, for by current digital signal and voltage digital signal export to Measured number electric energy meter.Wherein, optical fiber interface can be 10/100BASE-FX optical fiber interface, and single-mode fiber interface can be FT3 agreement single-mode fiber interface.

When being embodied as, user passes through touch screen LCD unbalanced input load model selection instruction, the first width Value parameter, the second magnitude parameters, waveform frequency, the frequency proportions of waveform, phase voltage virtual value, phase current virtual value, binary system Sequence, amplitude gain, function cycle, periodicity, the meter constant of standard digital electric energy meter and measured number electric energy meter Meter constant, touch screen LCD is by the above-mentioned data transfer of user input to central processing unit.In central processing unit First control unit is to digital signal processor output nonlinear load model selection instruction.Non-thread in digital signal processor Property load signal generating unit, generate for measured number electric energy meter nonlinear-load measuring accuracy measurement current digital letter Number, voltage digital signal and theoretical power (horse-power), to group bag unit output current numeral signal and voltage digital signal, process to central authorities Device exports theoretical power (horse-power).Group bag unit generates message, and calls the driving of ethernet controller, by multiple optical fiber interfaces, many Individual RJ45 interface and the one of or combination in any of multiple single-mode fiber interface, parallel output message is to measured number electric energy Table.Signal generator in central processing unit is according to theoretical power (horse-power) outputting standard current digital signal and normal voltage numeral letter Number；The built-in standard digital electric energy meter of central processing unit, defeated according to normalized current digital signal and normal voltage digital signal Go out standard active energy pulse to field programmable gate array unit.Field programmable gate array unit receives standard active energy Pulse, also receives the tested active energy arteries and veins according to current digital signal and voltage digital signal output for the measured number electric energy meter Punching；The built-in pulse comparative device of field programmable gate array unit, according to standard active energy pulse and tested active energy arteries and veins Punching calculates the nonlinear-load measuring accuracy of measured number electric energy meter, and returns it to central processing unit, central processing unit The nonlinear-load measuring accuracy of measured number electric energy meter is back to touch screen LCD shown.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：By parallel Nand flash memory and/or ferroelectric memory that bus is connected with central processing unit, for storing current digital signal, electricity Pressure digital signal, theoretical power (horse-power), tested active energy pulse, normalized current digital signal, normal voltage digital signal, standard have The nonlinear-load measuring accuracy of work(electrical energy pulse and digitalized electrical energy meter.

In embodiment, the nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter can also include：By serial The extension communication unit that bus is connected with central processing unit, for the nonlinear-load measuring accuracy of transmitting digitized electric energy meter. Extension communication unit can include：One of them or combination in any of RS485 interface, RS232 interface and RJ485 interface.

To sum up, the nonlinear-load measuring accuracy measurement apparatus of the digitalized electrical energy meter of the embodiment of the present invention, non-linear negative Lotus signal generating unit to measured number electric energy meter output current numeral signal and voltage digital signal, to measuring accuracy measuring unit Output theoretical power (horse-power)；Measuring accuracy measuring unit receives measured number electric energy meter and is believed according to current digital signal and voltage digital The tested active energy pulse of number output, receives the theoretical power (horse-power) of nonlinear-load signal generating unit output, according to theoretical power (horse-power) and Tested active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter, thus realize to digitized electricity The measurement of energy measuring accuracy under nonlinear-load for the table.The present invention can also pass through multichannel interface, transmits current digital signal With voltage digital signal to measured number electric energy meter, can the digitalized electrical energy meter of multiple stage different interface type be surveyed simultaneously Amount, improves measurement efficiency.

Particular embodiments described above, has carried out detailed further to the purpose of the present invention, technical scheme and beneficial effect Describe in detail bright, be should be understood that the specific embodiment that the foregoing is only the present invention, the guarantor being not intended to limit the present invention Shield scope, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., should be included in this Within the protection domain of invention.

Claims (8)

1. a kind of nonlinear-load measuring accuracy measurement apparatus of digitalized electrical energy meter are it is characterised in that include nonlinear-load Signal generating unit and measuring accuracy measuring unit, wherein：

Nonlinear-load signal generating unit is connected with measured number electric energy meter and measuring accuracy measuring unit；Measuring accuracy measurement is single Unit is connected with measured number electric energy meter；

Nonlinear-load signal generating unit is used for：Generate what the nonlinear-load measuring accuracy for measured number electric energy meter measured Current digital signal, voltage digital signal and theoretical power (horse-power), to measured number electric energy meter output current numeral signal and voltage Digital signal, exports theoretical power (horse-power) to measuring accuracy measuring unit；

Measuring accuracy measuring unit is used for：Receive measured number electric energy meter defeated according to current digital signal and voltage digital signal The tested active energy pulse going out, receives the theoretical power (horse-power) of nonlinear-load signal generating unit output, according to theoretical power (horse-power) and tested Active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter.

2. digitalized electrical energy meter according to claim 1 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Also include：

The first control unit being connected with nonlinear-load signal generating unit, for receiving nonlinear-load model selection instruction, to Nonlinear-load signal generating unit output nonlinear load model selection instruction；

Nonlinear-load signal generating unit includes：

Communication interface, for receiving the nonlinear-load model selection instruction of the first control unit output；

Intervalometer, for, after communication interface receives nonlinear-load model selection instruction, starting intervalometer；

Second control unit, for after starting intervalometer, according to nonlinear-load model selection instruction, from multiple non-linear negative In lotus pattern function, one nonlinear-load pattern function of Selection and call, generates based on the nonlinear-load of digitalized electrical energy meter The current digital signal of accuracy of measurement measurement, voltage digital signal and theoretical power (horse-power).

3. digitalized electrical energy meter according to claim 2 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Multiple nonlinear-load pattern functions include：

First nonlinear-load pattern function Y₁, Y₁=[U_a1,U_b1,U_c1,I_a1,I_b1,I_c1]；

$u_{a1}=\sqrt{2}{U}_{rms}sin\left(2\mathrm{\π}ft\right),$

$u_{b1}=\sqrt{2}{U}_{rms}sin(2\mathrm{\π}ft+\frac{2}{3}\mathrm{\π}),$

$u_{c1}=\sqrt{2}{U}_{rms}sin(2\mathrm{\π}ft-\frac{2}{3}\mathrm{\π}),$

$i_{a1}=\sqrt{2}{I}_{rms}\[a+bsin(2\mathrm{\π}ft/M)\]sin\left(2\mathrm{\π}ft\right),$

$i_{b1}=\sqrt{2}{I}_{rms}\[a+bsin(2\mathrm{\π}ft/M)\]sin(2\mathrm{\π}ft+\frac{2}{3}\mathrm{\π}),$

$i_{c1}=\sqrt{2}{I}_{rms}\[a+bsin(2\mathrm{\π}ft/M)\]sin(2\mathrm{\π}ft-\frac{2}{3}\mathrm{\π}),$

Wherein, u_a1For the A phase voltage of the first nonlinear-load pattern function, u_b1B phase for the first nonlinear-load pattern function Voltage, u_c1For the C phase voltage of the first nonlinear-load pattern function, i_a1Electric for the A phase of the first nonlinear-load pattern function Stream, i_b1For the B phase current of the first nonlinear-load pattern function, i_c1The C phase current of the first nonlinear-load pattern function, a is First amplitude parameter, b is the second magnitude parameters, and f is waveform frequency, and M is the frequency proportions of waveform, U_rmsFor phase voltage virtual value, I_rmsFor phase current virtual value, t is the time；

And, the second nonlinear-load pattern function Y₂, Y₂=[U_a2,U_b2,U_c2,I_a2,I_b2,I_c2]；

$u_{a2}=\sqrt{2}{U}_{rms}sin\left(2\mathrm{\π}ft\right),$

$u_{b2}=\sqrt{2}{U}_{rms}sin(2\mathrm{\π}ft+\frac{2}{3}\mathrm{\π}),$

$u_{c2}=\sqrt{2}{U}_{rms}sin(2\mathrm{\π}ft-\frac{2}{3}\mathrm{\π}),$

$i_{a2}=\underset{n\∈N}{\Σ}\sqrt{2}{I}_{rms}{a}_{n}sin\left(2\mathrm{\π}ft\right)g(t-nT),$

$i_{b2}=\underset{n\∈N}{\Σ}\sqrt{2}{I}_{rms}{a}_{n}sin(2\mathrm{\π}ft+\frac{2}{3}\mathrm{\π})g(t-nT),$

$i_{c2}=\underset{n\∈N}{\Σ}\sqrt{2}{I}_{rms}{a}_{n}sin(2\mathrm{\π}ft-\frac{2}{3}\mathrm{\π})g(t-nT),$

Wherein, u_a2For the A phase voltage of the second nonlinear-load pattern function, u_b2B phase for the second nonlinear-load pattern function Voltage, u_c2For the C phase voltage of the second nonlinear-load pattern function, i_a2Electric for the A phase of the second nonlinear-load pattern function Stream, i_b2For the B phase current of the second nonlinear-load pattern function, i_c2The C phase current of the second nonlinear-load pattern function, a_nFor Binary sequence, g (t-nT) is amplitude gain, and T is function cycle, and n is periodicity, and N is set of nonnegative integer；

When calling the first nonlinear-load pattern function, current digital signal includes：

The A phase current of the first nonlinear-load pattern function, the B phase current of the first nonlinear-load pattern function and the first non-thread The C phase current of property load model function；

Voltage digital signal includes：

The A phase voltage of the first nonlinear-load pattern function, the B phase voltage of the first nonlinear-load pattern function and the first non-thread The C phase voltage of property load model function；

When calling the second nonlinear-load pattern function, current digital signal includes：

The A phase current of the second nonlinear-load pattern function, the B phase current of the second nonlinear-load pattern function and the second non-thread The C phase current of property load model function；

Voltage digital signal includes：

The A phase voltage of the second nonlinear-load pattern function, the B phase voltage of the second nonlinear-load pattern function and the second non-thread The C phase voltage of property load model function.

4. digitalized electrical energy meter according to claim 3 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Measuring accuracy measuring unit includes：

Signal generator, for according to theoretical power (horse-power), exporting the normalized current digital signal that mean power is theoretical power (horse-power) and mark Quasi- voltage digital signal；

The standard digital electric energy meter being connected with signal generator, for according to normalized current digital signal and normal voltage numeral Signal, outputting standard active energy pulse；

The pulse comparative device being connected with measured number electric energy meter, standard digital electric energy meter respectively, for according to tested active Electrical energy pulse and standard active energy pulse, the nonlinear-load measuring accuracy of output measured number electric energy meter.

5. digitalized electrical energy meter according to claim 4 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Obtain the nonlinear-load measuring accuracy of measured number electric energy meter by equation below：

$E=\frac{(\frac{M}{C_b}-\frac{N}{C_m}\·R)}{\left(\frac{M}{C_b}\right)}\·100\%,$

Wherein, E is the nonlinear-load measuring accuracy of measured number electric energy meter, and M is the active electricity of standard in a function cycle Energy impulse number, N is the tested active energy umber of pulse in a function cycle, C_bFor the meter constant of standard digital electric energy meter, C_m For the meter constant of measured number electric energy meter, R is proportion function.

6. digitalized electrical energy meter according to claim 5 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Proportion function R is obtained by equation below：

When nonlinear-load signal generating unit calls the first nonlinear-load pattern function, proportion function R=1；

When nonlinear-load signal generating unit calls the second nonlinear-load pattern function, proportion function R=L/S,

Wherein, L is a_nThe sum of middle binary number, S is a_nMiddle binary number is 1 sum.

7. digitalized electrical energy meter according to claim 5 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Also include：

The group bag unit being connected with nonlinear-load signal generating unit and measured number electric energy meter respectively, for believing current digital Number and voltage digital signal group bag generate message, message is sent to measured number electric energy meter.

8. digitalized electrical energy meter according to claim 5 nonlinear-load measuring accuracy measurement apparatus it is characterised in that Also include：

The touch screen LCD being connected with the first control unit, for selecting to refer to for user input nonlinear-load model Order, first amplitude parameter, the second magnitude parameters, waveform frequency, the frequency proportions of waveform, phase voltage virtual value, phase current are effective Value, binary sequence, amplitude gain, function cycle, periodicity, the meter constant of standard digital electric energy meter and measured number The meter constant of electric energy meter；

Touch screen LCD is additionally operable to：The nonlinear-load measuring accuracy of display measured number electric energy meter.