CN103076493B - Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip - Google Patents
Three-phase reactive power measuring and crosstalk compensating method for electric energy metering chip Download PDFInfo
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Abstract
The invention discloses a three-phase reactive power measuring and crosstalk compensating method for an electric energy metering chip. The method comprises the following steps of calculating each single-phase reactive power; compensating each single-phase reactive power, so as to obtain the compensated single-phase reactive power; carrying out small-signal detection, and according to the detection result, selecting the single-phase reactive power or the compensated single-phase reactive power to calculate the total reactive power; and carrying out inverse compensation on the total reactive power. The method has the advantages that the accurate measuring of the three-phase reactive power is realized; and the problem of calculation error of the reactive power caused by the easy influence of crosstalk noise on the small signal in the electric energy metering chip is solved.
Description
Technical field
The present invention relates to electric energy metrical field, particularly relate to a kind of three phase reactive power for electric energy computation chip and measure and crosstalk compensation method.
Background technology
Electric energy metrical is electric power enterprise production, scientific research and the indispensable important foundation work of operation control.The calculating of reactive 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 phase reactive power, need sample three road electric currents and three road voltages simultaneously, adopt 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, thus easily 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 phase reactive power for electric energy computation chip is the object of the present invention is to provide to measure and crosstalk compensation method, achieve the Measurement accuracy of three phase reactive power, solve small-signal in chip and be easily subject to crosstalk noise impact, and cause reactive power to calculate the problem of error.
The technical scheme realizing above-mentioned purpose is:
A kind of three phase reactive 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 phase reactive power, a corresponding road current signal of single-phase passage and a road voltage signal, described method comprises the following steps:
A single-phase passage, performs a step S1 ~ S3:
Step S1, according to the road current signal and the road voltage signal that correspond to current single-phase passage, calculates the single-phase reactive power of this 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, compensates single-phase reactive power, the single-phase reactive power of the single-phase reactive power VARS=+VAROS after being compensated, and wherein, VAROS represents: reactive power offset correction;
Step S3, carries out small-signal detection to the current signal of current single-phase passage and voltage signal, judges whether this current signal and voltage signal are small-signal, if so, then select the single-phase reactive power after described compensation as the single-phase output power of this single-phase passage; If not, then select single-phase reactive power described in step S1 as the single-phase output power of this single-phase passage;
Step S4, experience three step S1 ~ S3 are obtained three single-phase output powers to be added, obtain total reactive power, and inverse compensation is carried out to it, obtain the total reactive power of the total reactive power FVAR=+FVAROS*VARFAT after inverse compensation, wherein, FVAROS represents: the reactive power offset correction after inverse compensation; VARFAT represents inverse compensation factor.
The above-mentioned three phase reactive 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 phase reactive power for electric energy computation chip is measured and crosstalk compensation method, and wherein, described reactive power offset correction and the reactive 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 wattless power measurement, inverse compensation is carried out to total wattless power measurement, thus avoid because small-signal is subject to crosstalk noise impact, and the reactive power caused calculates error problem, achieve the Measurement accuracy of electric energy computation chip three phase reactive power.Real-time of the present invention is high, and compensation way is flexible, is easy to realize, has very high practical 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 phase reactive 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 phase reactive power, a corresponding road current signal of single-phase passage and a road voltage signal.Refer to Fig. 4, the three phase reactive power for electric energy computation chip of the present invention is measured and crosstalk compensation method, comprises the following steps:
A single-phase passage, performs a step S1 ~ S3, because there are three single-phase passages, so perform three step S1 ~ S3:
Step S1, for certain single-phase passage current, a road current signal and a road voltage signal 506(phase A, phase B or phase C according to this single-phase passage), calculate the single-phase reactive power VAR501 of this single-phase passage; Wherein, single-phase reactive 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, current single-phase reactive power VAR501 is compensated, namely by formula VARS=VAR+VAROS, single-phase reactive power VARS (AVARS, BVARS or CVARS) 503 after being compensated, wherein: VAROS(AVAROS, BVAROS or CVAROS) 502 represent: reactive power offset correction, pass through register configuration;
Step S3, by small-signal detecting unit (Small-signal detect) 505, current signal and the voltage signal 506(phase A of current single-phase passage will be corresponded to, phase B or phase C) carry out small-signal detection, judge this current signal and voltage signal 506(phase A, phase B or phase C) whether be small-signal, if, by MUX 504, select the single-phase reactive power VARS (AVARS after compensating, BVARS or CVARS) 503, as the single-phase output power (AVAR of this single-phase passage, BVAR or CVAR), if not, by MUX 504, select single-phase reactive power VAR501 as the single-phase output power (AVAR, BVAR or CVAR) of this single-phase passage,
Step S4, experience three step S1 ~ S3, obtain three single-phase output power AVAR, BVAR and CVAR, they are added, obtain total reactive power 509, by inverse compensating unit (inverse compensation) 507, inverse compensation is carried out to total reactive power 509, namely by formula F VAR=(AVAR+BVAR+CVAR)+(FVAROS*VARFAT), obtain the total reactive power FVAR508 after inverse compensation, wherein: FVAROS510 represents the reactive power offset correction after inverse compensation, passes through register configuration; VARFAT represents inverse compensation factor, detects three road current signals and voltage signal 506phase A, phase B and phase C, then calculated by software algorithm by small-signal detecting unit 505.
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 (2)
1. the three phase reactive 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 phase reactive 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:
A single-phase passage, performs a step S1 ~ S3:
Step S1, according to the road current signal and the road voltage signal that correspond to current single-phase passage, calculates the single-phase reactive power of this 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, compensates single-phase reactive power, the single-phase reactive power of the single-phase reactive power VARS=+VAROS after being compensated, and wherein, VAROS represents: reactive power offset correction;
Step S3, carries out small-signal detection to the current signal of current single-phase passage and voltage signal, judges whether this current signal and voltage signal are small-signal, if so, then select the single-phase reactive power after described compensation as the single-phase output power of this single-phase passage; If not, then select single-phase reactive power described in step S1 as the single-phase output power of this single-phase passage;
Step S4, experience three step S1 ~ S3 are obtained three single-phase output powers to be added, obtain total reactive power, and inverse compensation is carried out to it, obtain the total reactive power of the total reactive power FVAR=+FVAROS*VARFAT after inverse compensation, wherein, FVAROS represents: the reactive power offset correction after inverse compensation; VARFAT represents inverse compensation factor,
Described inverse compensation factor, according to three road current signals and three road voltage signals, calculates.
2. the three phase reactive power for electric energy computation chip according to claim 1 is measured and crosstalk compensation method, it is characterized in that, described reactive power offset correction and the reactive power offset correction after compensating all pass through register configuration.
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| US10545182B2 (en) * | 2016-03-17 | 2020-01-28 | Texas Instruments Incorporated | Crosstalk calibration for multi-channel systems |
| US11408920B2 (en) * | 2019-11-01 | 2022-08-09 | Landis+Gyr Innovations, Inc. | Crosstalk cancelation for electricity metering |
Citations (4)
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| CN1404197A (en) * | 2002-10-16 | 2003-03-19 | 武汉大学 | Dynamic split-phase compensation method and device for reactive power |
| CN1975441A (en) * | 2006-12-19 | 2007-06-06 | 武汉大学 | Method for metering reactive electric energy |
| CN101063695A (en) * | 2007-06-12 | 2007-10-31 | 北京中星微电子有限公司 | Reactive power calculating circuit and method |
| CN101144834A (en) * | 2007-08-03 | 2008-03-19 | 杭州万工科技有限公司 | Electric energy compensation method based on active and reactive power vector |
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| DE102004010707B4 (en) * | 2004-03-04 | 2013-08-22 | Austriamicrosystems Ag | Energy meter arrangement and method for calibration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1404197A (en) * | 2002-10-16 | 2003-03-19 | 武汉大学 | Dynamic split-phase compensation method and device for reactive power |
| CN1975441A (en) * | 2006-12-19 | 2007-06-06 | 武汉大学 | Method for metering reactive electric energy |
| CN101063695A (en) * | 2007-06-12 | 2007-10-31 | 北京中星微电子有限公司 | Reactive power calculating circuit and method |
| CN101144834A (en) * | 2007-08-03 | 2008-03-19 | 杭州万工科技有限公司 | Electric energy compensation method based on active and reactive power vector |
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