CN103091525B - Electric energy measuring chip three phase wattful power measurement and crosstalk compensation method - Google Patents
Electric energy measuring chip three phase wattful power measurement and crosstalk compensation method Download PDFInfo
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Abstract
The invention discloses an electric energy measuring chip three phase wattful power measurement and crosstalk compensation method. The electric energy measuring chip three phase wattful power measurement and crosstalk compensation method includes the following steps: calculating wattful power of each single-phase, compensating each single-phase wattful power, detecting small signals, selecting single-phase wattful power or single-phase wattful power after compensation according to the result, calculating the whole wattful power, and conducting adverse compensation of the whole wattful power. The electric energy measuring chip three phase wattful power measurement and crosstalk compensation method solve the problems that the small signals inside the chip are prone to being influenced by crosstalk noise and causing calculation error of the wattful power so that accurate measurement of the three phase wattful power is achieved.
Description
Technical field
The present invention relates to electric energy metrical field, particularly relate to a kind of three phases active power for electric energy computation chip and measure and crosstalk compensation method.
Background technology
Electric energy is important secondary energy, generally uses in modern society.The production of electric power is different with the production of other products, be characterized in generating plant generating, power supply department is powered, these three departments of user power utilization form a system, be closely connected mutually indispensable, mutual sale between them just needs a kind of measurement technology between three departments, carry out the Dosage calculation of electric energy, and this technology is exactly electric energy metrical.
Electric energy metrical is electric power enterprise production, scientific research and the indispensable important foundation work of operation control.In a sense, electric energy metrical work is the important symbol representing electric power enterprise benefit and quality level, is the most important condition that electric power enterprise is participated in market competition.There is no electric energy metrical accurately, just there is no science, rational electric quantity data.The calculating of active power is completed now mainly through the computation chip in electric energy meter.
At present, three-phase electrical energy computation chip many uses AFE (analog front end) and digital signal processing carry out calculating correction values, when measuring three phases active power, need sample three road electric currents and three road voltages simultaneously.The sampling of current/voltage adopts 6 road AD converters altogether, these mimic channels and following digital circuit integrated by a chip, inevitably there is the crosstalk between analog channel.Crosstalk noise is particularly evident when measuring small signal power, and the measuring error that signal cross-talk noise causes is maximum reaches 0.5% of small signal power measured value, thus causes the small signal power error of calculation, as shown in Figure 1, Figure 2 and Figure 3.Wherein, Fig. 1 represents metering core on-chip circuit crosstalk Physical layer schematic diagram, and in figure, Insulator represents insulation course; Substrate(ground) support plate is represented; Fig. 2 represents that metering core on-chip circuit crosstalk layout(connects up) schematic diagram, A, B, C represent three-phase; Fig. 3 represents metering core on-chip circuit cross-talk models schematic diagram, and Aggressor net A represents interference line A; Victim net B represents and is disturbed line B; Aggressor net C represents interference line C; Driver represents pre-driver circuitry; Receiver represents rear class receiving circuit.
Summary of the invention
A kind of three phases active power for electric energy computation chip is the object of the present invention is to provide to measure and crosstalk compensation method, solve small-signal in chip and be easily subject to crosstalk noise impact, and cause active power to calculate the problem of error, realize the Measurement accuracy of three phases active power.
The technical scheme realizing above-mentioned purpose is:
A kind of three phases active power for electric energy computation chip is measured and crosstalk compensation method, described electric energy computation chip to be sampled three road current signals and three road voltage signals by three single-phase passages, measure three phases active power, a corresponding road current signal of single-phase passage and a road voltage signal, described method comprises the following steps:
Step S1, respectively according to the road current signal and the road voltage signal that correspond to each single-phase passage, calculates the single-phase active power of each single-phase passage
wherein: V is the magnitude of voltage of voltage signal; I is the current value of current signal;
represent the phase differential of voltage and current;
Step S2, by the single-phase active power of formula W ATTS=+WATTOS, realizes the compensation to each single-phase active power, wherein: WATTS represents the single-phase active power after compensation, and WATTOS represents: active power offset correction;
Step S3, respectively for each single-phase passage, carry out: the road current signal and a road voltage signal that correspond to single-phase passage are carried out small-signal detection, judge whether this current signal and voltage signal are small-signal, if so, then select the single-phase active power after described compensation as the single-phase output power of this single-phase passage; If not, then select single-phase active power described in step S1 as the single-phase output power of this single-phase passage;
Step S4, be added obtaining three single-phase output powers in step S3, obtain total active power, and by the total active power of formula F WATT=+FWATTOS*WATTFAT, realize the inverse of total active power to compensate, wherein: FWATT represents the total active power after inverse compensation, FWATTOS represents the active power offset correction after inverse compensation; WATTFAT represents inverse compensation factor.
The above-mentioned three phases active power for electric energy computation chip is measured and crosstalk compensation method, and wherein, described inverse compensation factor, according to three tunnel road current signals and three road voltage signals, calculates.
The above-mentioned three phases active power for electric energy computation chip is measured and crosstalk compensation method, and wherein, described active power offset correction and the active power offset correction after compensating all pass through register configuration.
The invention has the beneficial effects as follows: the present invention is by carrying out small-signal compensation to every phase wattful power messurement, carry out the inverse of some to total wattful power messurement to compensate, thus the error change of offsetting because crosstalk noise brings, avoid because small-signal is subject to crosstalk noise impact, and the active power caused calculates error problem, realize the Measurement accuracy of electric energy computation chip three phases active power.Real-time of the present invention is high, and compensation way is flexible, is easy to realize, has very high using value.
Accompanying drawing explanation
Fig. 1 is metering core on-chip circuit crosstalk Physical layer schematic diagram;
Fig. 2 is metering core on-chip circuit crosstalk layout schematic diagram;
Fig. 3 is metering core on-chip circuit cross-talk models schematic diagram;
Fig. 4 is the schematic flow sheet of the three phases active power for electric energy computation chip of the present invention measurement and crosstalk compensation method.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Electric energy computation chip to be sampled three road current signals and three road voltage signals by three single-phase passages, measures three phases active power, a corresponding road current signal of single-phase passage and a road voltage signal.Refer to Fig. 4, the three phases active power for electric energy computation chip of the present invention is measured and crosstalk compensation method, comprises the following steps:
Step S1, respectively according to the road current signal and a road voltage signal 406(phase A, the phase B or phase C that correspond to each single-phase passage), calculate the single-phase active power WATT401 of each single-phase passage; Wherein, single-phase active power
v is the magnitude of voltage of voltage signal; I is the current value of current signal;
represent the phase differential of voltage and current;
Step S2, each single-phase active power WATT401 is compensated, namely by formula W ATTS=WATT+WATTOS, single-phase active power WATTS (AWATTS, BWATTS or CWATTS) 403 after being compensated, wherein: WATTOS(AWATTOS, BWATTOS or CWATTOS) 402 represent: active power offset correction, pass through register configuration;
Step S3, respectively for each single-phase passage, carry out: by small-signal detecting unit (Small-signaldetect) 405, a road current signal and a road voltage signal 406(phase A of single-phase passage will be corresponded to, phase B or phase C) carry out small-signal detection, judge this current signal and voltage signal 406(phaseA, phase B or phase C) whether be small-signal, if, by MUX 404, select the single-phase active power WATTS (AWATTS after compensating, BWATTS or CWATTS) 403 as the single-phase output power (AWATT of this single-phase passage, BWATT or CWATT), if not, by MUX 404, select single-phase active power WATT401 as the single-phase output power (AWATT, BWATT or CWATT) of this single-phase passage,
Step S4, by step S3, obtain three single-phase output power AWATT, BWATT and CWATT, they are added, obtain total active power 409, by inverse compensating unit (inverse compensation) 407, inverse compensation is carried out to total active power 409, obtain the total active power FWATT408 after inverse compensation, wherein: FWATT=(AWATT+BWATT+CWATT)+(FWATTOS*WATTFAT), FWATTOS410 represent the active power offset correction after inverse compensation, pass through register configuration; WATTFAT represents inverse compensation factor, detects three road current signals and voltage signal 406phase A, phase B and phase C, then calculated by software algorithm by small-signal detecting unit 405.
To sum up, the Measurement accuracy of electric energy computation chip three phases active power is achieved.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (3)
1. the three phases active power for electric energy computation chip is measured and crosstalk compensation method, described electric energy computation chip to be sampled three road current signals and three road voltage signals by three single-phase passages, measure three phases active power, a corresponding road current signal of single-phase passage and a road voltage signal, it is characterized in that, described method comprises the following steps:
Step S1, respectively according to the road current signal and the road voltage signal that correspond to each single-phase passage, calculates the single-phase active power of each single-phase passage
wherein: V is the magnitude of voltage of voltage signal; I is the current value of current signal;
represent the phase differential of voltage and current;
Step S2, by the single-phase active power of formula W ATTS=+WATTOS, realizes the compensation to each single-phase active power, wherein: WATTS represents the single-phase active power after compensation, and WATTOS represents: active power offset correction;
Step S3, respectively for each single-phase passage, carry out: the road current signal and a road voltage signal that correspond to single-phase passage are carried out small-signal detection, judge whether this current signal and voltage signal are small-signal, if so, then select the single-phase active power after described compensation as the single-phase output power of this single-phase passage; If not, then select single-phase active power described in step S1 as the single-phase output power of this single-phase passage;
Step S4, be added obtaining three single-phase output powers in step S3, obtain total active power, and by the total active power of formula F WATT=+FWATTOS*WATTFAT, realize the inverse of total active power to compensate, wherein: FWATT represents the total active power after inverse compensation, FWATTOS represents the active power offset correction after inverse compensation; WATTFAT represents inverse compensation factor.
2. the three phases active power for electric energy computation chip according to claim 1 is measured and crosstalk compensation method, it is characterized in that, described inverse compensation factor, according to three tunnel road current signals and three road voltage signals, calculates.
3. the three phases active power for electric energy computation chip according to claim 1 is measured and crosstalk compensation method, it is characterized in that, described active power offset correction and the active power offset correction after compensating all pass through register configuration.
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