CN1249443C - Power relevance quantity measuring device - Google Patents
Power relevance quantity measuring device Download PDFInfo
- Publication number
- CN1249443C CN1249443C CN 03157783 CN03157783A CN1249443C CN 1249443 C CN1249443 C CN 1249443C CN 03157783 CN03157783 CN 03157783 CN 03157783 A CN03157783 A CN 03157783A CN 1249443 C CN1249443 C CN 1249443C
- Authority
- CN
- China
- Prior art keywords
- phase
- correction
- power
- associated volume
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
- Gyroscopes (AREA)
Abstract
To solve the problem wherein the calculation for power related amounts has errors, if the voltage signal input, current signal input, and A/D converter are influenced by the magnitudes of voltage and current to be detected, the frequency of the voltage and current to be detected, and an operating temperature. This power-related amount measuring device is set with primary straight lines, beforehand; changes in the characteristics of a voltage signal input; a current signal input whose parameters are the effective value of voltage Vrms_1; the effective value of current Irms_1, and the power supply frequency, and changes in the characteristic of the A/D converter, whose parameter is its temperature. The device is so formed as to correct the changes in the characteristics, by updating the coefficients of an amplitude phase correction matrix being used at regular operations, at a fixed time intervals.
Description
Technical field
The present invention relates at least one measurement mechanism measured (power associated volume measurement mechanism hereinafter referred to as) in power (meritorious, idle), the electric energy (meritorious, idle) is related to this measurement mechanism with the calibration function that improves measuring accuracy.
Background technology
Means are handled in the moving average that existing power associated volume measurement mechanism has the delta sigma AD modulator that utilizes the raising frequency sample frequency respectively voltage signal and current signal to be quantized, utilize digital filter respectively the voltage signal after quantizing and current signal to be carried out moving average, the multiplication means that moving average voltage signal processed and current signal multiplied each other in each sample frequency and the wave digital lowpass filter of removing the high fdrequency component of the value that multiplies each other.
Also have and make from utilizing delta sigma AD modulator that described raising frequency sample frequency quantizes to shift regularly variable and adjust the shift register phase correction means of the phase place voltage signal-current signal and the isostatic correction means (patent documentation 1: No. 3080207 communique of patent) of adjusting the equilibrium of each phase power associated volume to the data of the moving average means of back level.
Again, adjust phase place and each equilibrium of power associated volume mutually between the voltage signal-current signal of each phase, suppress the deviation of signal that voltage signal input medium and current signal input medium produce, thus the measuring accuracy of meeting the requirements of (patent documentation 2: No. 3330519 communique of patent).
The deviation of signal that voltage signal input medium and current signal input medium produce depends on the frequency of the size of the voltage and current that will detect, the voltage and current that will detect, the temperature in the computing.Temperature also influences the conversion characteristics of AD transducer.That is to say that in a single day the temperature in the size of the voltage and current that will detect, frequency, the computing changes, the deviation of the signal that voltage signal input medium, current signal input medium and AD transducer produce just changes.
Yet existing power associated volume measurement mechanism is proofreaied and correct rated voltage, rated current and rated frequency by normal temperature when device dispatches from the factory, and this corrected value is fixed.That is, except that initial setting, can not be in the measurement according to voltage, electric current, frequency or temperature correction operation values.
Therefore, for the precision that obtains to satisfy at big input range, large-temperature range, the error change is little and precision is high voltage signal input medium, current signal input medium and AD transducer that temperature in size, frequency and the computing of the voltage and current that the needs employing will detect etc. causes, thereby cost height.
The present invention finishes for addressing this problem, and its objective is the little power associated volume measurement mechanism of temperature effect in the size that obtains being subjected to the voltage and current that will detect, frequency, the computing.
Summary of the invention
The invention provides a kind of power associated volume measurement mechanism, have: to be loaded in current sensor on the line of electric force and voltage sensor senses to current signal and the voltage signal AD translation circuit that carries out digital conversion respectively; When asking the frequency of described voltage signal, after the voltage signal of described AD translation circuit output and current signal being multiplied each other in each sample frequency, utilize the high fdrequency component in the value after the filtering of wave digital lowpass filter means is multiplied each other, power W_in_N before the output calibration, thereby the power associated volume operational part of the power associated volume of the described line of electric force of computing, N=1 wherein, 2,3; As parameter, utilize the correction of storage in advance to calculate correcting value in described voltage signal, current signal and the frequency at least one, proofread and correct the correction means of described power associated volume with a straight line.
The invention provides a kind of power associated volume measurement mechanism, have: to be loaded in current sensor on the line of electric force and voltage sensor senses to electric current and the voltage AD translation circuit that carries out digital conversion respectively; Detect the Temperature Detector of the temperature of described AD translation circuit; When asking the frequency of described voltage signal, after the voltage signal of described AD translation circuit output and current signal being multiplied each other in each sample frequency, utilize the high fdrequency component in the value after the filtering of wave digital lowpass filter means is multiplied each other, power W_in_N before the output calibration, thereby the power associated volume operational part of the power associated volume of the described line of electric force of computing, N=1 wherein, 2,3; As parameter, utilize the correction of storage in advance to calculate correcting value described temperature, proofread and correct the correction means of described power associated volume with a straight line.
Description of drawings
Fig. 1 is the figure of composition that the power associated volume measurement mechanism of the invention process form 1 is shown.
Fig. 2 is the part detail drawing of Fig. 1.
Fig. 3 is the geometric power diagram before and after proofreading and correct.
Fig. 4 is the figure that the flow process of correction is shown.
Fig. 5 is the relation of explanation CT gallon medium frequency and phase place and proofreaies and correct linear performance plot.
Fig. 6 is that linear figure is proofreaied and correct in explanation.
Fig. 7 is the CT gallon medium frequency of explanation the invention process form 5 and the relation and the linear figure of correction of phase place.
In the accompanying drawing, 101, the 103rd, voltage signal, 121,123,221, the 223rd, delta sigma AD transducer, 141,143,241, the 243rd, voltage effective value computing means, 161,163,261, the 263rd, current effective value computing means, 191,193,291, the 293rd, the Hilbert transform means, 201, the 203rd, current signal, 301, the 303rd, the multiplication means, 321, the 323rd, wave digital lowpass filter means, 341, the 343rd, multiplication means, 361, the 363rd, the wave digital lowpass filter means, the 54th, supply frequency computing means, the 56th, the temperature survey means, W_in_N is the power before proofreading and correct, W_out_N is the power after proofreading and correct, var_in_N is the reactive power before proofreading and correct, var_out_N is the reactive power after proofreading and correct, Vrms_1, Vrms_3 is a voltage effective value, Irms_1, Irms_3 is a current effective value, Freq is a supply frequency, and Temp is a temperature.
Embodiment
Example 1
Below, the composition of the power associated volume measurement mechanism of the invention process form 1 is described according to Fig. 1, Fig. 2.Among Fig. 1, Fig. 2, be convenient to understand in order to make figure, only illustrate 1 mutually with 3 mutually situations, omit the figure of 2 phase times.
In the following description, especially to symbol, aspect application formality, record tightly do not distinguished in character by size.
Among Fig. 1, after the delta sigma AD transducer (AD transducer hereinafter referred to as) 121,123,221,223 that each signal is provided with utilizes the raising frequency sampling frequency respectively the detected current signal 201,203 of not shown current sensor (hereinafter being sometimes referred to as CT) that loads on the detected power voltage line signal 101,103 of voltage sensor (hereinafter being sometimes referred to as PT) that is loaded in not shown line of electric force and the described line of electric force to be quantized, with its power input associated volume operational part 100.Frequency calculation means 54 are asked frequency from the voltage output of AD transducer, are obtained the temperature of each AD transducer again by temperature detection means 56, with its power input associated volume operational part 100.
Fig. 2 illustrates the detailed condition of power associated volume operational part 100.Among Fig. 2, after unshowned moving average processing means utilize digital filter respectively the voltage signal that quantizes and current signal to be carried out moving average, with its input multiplication means 301,303.Multiplication means 301,303 multiplied each other to moving average voltage signal processed and current signal in each sampling period.The high fdrequency component of the described value that multiplies each other of wave digital lowpass filter means 321,323 filterings.The output of these wave filter means 321,323 is called the power W_in_N (N=1,2,3) before proofreading and correct.W_in_N when electric power receives be on the occasion of, and when sending, be negative value.
Though do not specifically illustrate among the figure, the AD transducer 121,123,221,223 of Fig. 1 carries out the part after the AD conversion, and its processing can all be handled by software or hardware.
The Hilbert transform means be made up of Hilbert transform (quadrature phase) 191 (193) and Hilbert transform (homophase) 291 (293) 191,193,291,293 are revolved the phase place between voltage signal-current signal and are turn 90 degrees.Multiplication means 341,343 multiply each other at the voltage signal and the current signal of each sample frequency with the output of Hilbert transform means.The multiply each other high fdrequency component of value of wave digital lowpass filter means 361,363 filterings.The output of these means 361,363 is called the reactive power var_in_N (N=1,2,3) before proofreading and correct.Var_in_N electric power receive lag and send when leading on the occasion of, and electric power to receive leading and send be negative value when lagging.
Amplitude phase correction matrix operation means 381,383 before will proofreading and correct power W_in_N and reactive power var_in_N as input, the correction calculation that hereinafter illustrates.Its output is called the power W_out_N (N=1,2,3) after the correction, the reactive power var_out_N (N=1,2,3) after the correction.The correction calculation of formula (1) expression amplitude phase correction matrix operation means 381,383.
Gain_N-|B|/| A|... (formula 2)
In formula (1), the formula (2), N (N=1,2,3) represents each phase.Formula (1), formula (2) they are timing at θ _ N, carry out anticlockwise, thereby θ _ N is timing, the rotation of the direction that lags, and it carries out the rotation of leading direction when negative.In order to help to understand, Fig. 3 illustrates this relation.
Under rated voltage, rated current, rated frequency, normal temperature, ask Gain_N and θ _ N in the matrix of above-mentioned formula (1), formula (2), power associated volume measurement mechanism of the present invention is when initial the adjustment, according to these formulas (1), formula (2), carry out the phase place adjustment between voltage signal-current signal, the equilibrium adjustment of each phase power associated volume.During except that adjustment, the Gain_N and the θ _ N of decision are constant when initially adjusting, and separate with the amplitude phase correction matrix that uses in the actual operation, and the amplitude phase correction matrix during as initial the adjustment is stored in advance.
Amplitude phase correction matrix during initial the adjustment
Fig. 4 illustrates correcting process of the present invention.Fig. 5 illustrates supply frequency is changed the notion that the phase changing capacity cause is proofreaied and correct.Fig. 5 is that explanation CT is at the relation of gallon medium frequency and phase place and the key diagram of correction straight line.Fig. 5 (a) be transverse axis be frequency (performance plot when 40Hz～70Hz), the longitudinal axis are phase error (1 degree～+ 0.4 degree), the actual characteristic 90 of CT is shown and the correction that actual characteristic 90 is similar to linear function (straight line hereinafter referred to as) with a straight line 91.Fig. 5 (b) uses with the identical transverse axis of Fig. 5 (a), the longitudinal axis margin of error of utilize proofreading and correct with the phase error of each frequency behind straight line 91 emending frequency is shown, and shows to fall in 45Hz～60Hz scope in 0.1 error of spending.
Obtain current voltage effective value Vrms_1, Vrms_3 from effective value voltage operational means 161,163, utilize a straight line proofreading and correct usefulness to calculate the correction of amplitude rate (inverse of amplitude change rate) and the phase changing capacity of voltage effective value.A straight line of the correction of amplitude rate of voltage and phase changing capacity correction usefulness is all similar with the frequency error rate shown in Fig. 5 (a), Fig. 5 (b), thereby omits its characteristic of diagram.Further describe corrector below.In the following explanation, N represents each phase.That is N=1,2,3.If
The correction of amplitude rate of voltage effective value Vrms_1, Vrms_3 is Gain_Vrms_N,
Phase changing capacity is Phase_Vrms_N,
A straight slope of correction of amplitude rate is A_Gain_Vrms,
Intercept is B_Gain_Vrms,
A straight slope of phase changing capacity is A_Phase_Vrms,
Intercept is B_Phase_Vrms,
Current voltage effective value is Vrms_N, and then corrector can be expressed as follows.
Gain_Vrms_N＝A_Gain_Vrms×Vrms_N+B_Gain_Vrms....(V1)
Phase_Vrms_N＝A_Phase_Vrms×Vrms_N+B_Phase_Vrms..(V2)
Be predetermined correction of amplitude rate Gain_Vrms_N, making it is to be 1 under the voltage condition when initially adjusting at voltage effective value.Set Phase_Vrms_N again, making it is to be 0 under the voltage condition when initially adjusting at voltage effective value, and the variable quantity of leading direction is for just, and the variable quantity of the direction that lags is for bearing.Voltage during initial adjust here is meant and is decided to be the benchmark voltage of (not needing to proofread and correct) when adjusting, the voltage in the time of may not being limited to actual adjustment.In order to help to understand, Fig. 6 illustrates above-mentioned formula (V1), formula (V2).
Can store described rated voltage in advance, convert automatically and obtain intercept, the setting that at this moment can omit intercept from the slope of rated voltage and straight line.Also can freely set or change the slope and the intercept of a straight line.
Therefore, when the circuit of change voltage signal input medium is formed (for example changing resistor voltage divider circuit etc. into), can only change the slope of a straight line of described correction usefulness and the value of intercept from the PT circuit.
Embodiment 2
Obtain current current effective value Irm_1, Irm_3 from current effective value computing means 261,263, utilize straight line to calculate the correction of amplitude rate (inverse of amplitude change rate) and the phase changing capacity of current effective value.
If
The correction of amplitude rate of current effective value Irm_1, Irm_3 is Gain_Irms_N,
Phase changing capacity is Phase_Irms_N,
A straight slope of correction of amplitude rate is A_Gain_Irms,
Intercept is B_Gain_Irms,
A straight slope of phase changing capacity is A_Phase_Irms,
Intercept is B_Phase_Irms,
Current current effective value is Irms_N, and then corrector can be expressed as follows.
Gain_Irms_N＝A_Gain_Irms×Irms_N+B_Gain_Irms....(I1)
Phase_Irms_N＝A_Phase_Irms×Irms_N+B_Phase_Irms...(I2)
Set Gain_Irms_N, making it is 1 under the situation of the electric current of current current effective value during for initial the adjustment.Set Phase_Irms_N again, making it is to be 0 under the situation of the electric current when initially adjusting at current current effective value, and the variable quantity of leading direction is for just, and the variable quantity of the direction that lags is for bearing.Therefore, the electric current when also storing initial is adjusted in advance from current current value and straight slope conversion intercept, at this moment can reduce the set amount of intercept.Also can freely set or change the slope and the intercept of a straight line.Therefore, (for example change into type CT circuit along separate routes) when the circuit of change current signal input medium is formed, can only change the value of the slope and the straight line of a straight line from the CT circuit.Formula (I1), formula (I2) performance plot and Fig. 6 are similar, thereby omission illustrates.
Embodiment 3
Obtain current supply frequency Freq from supply frequency computing means 54, utilize a straight line proofreading and correct usefulness to calculate the correction of amplitude rate (inverse of amplitude change rate) and the phase changing capacity of the voltage signal input and the current signal input of supply frequency.
If the correction of amplitude rate of the voltage signal of supply frequency input is Gain_FreqV,
Phase changing capacity is Phase_, FreqV,
A straight slope of correction of amplitude rate is A_Gain_FreqV,
Intercept is B_Gain_FreqV,
A straight slope of phase changing capacity is A_Phase_FreqV,
Intercept is B_Phase_FreqV,
The correction of amplitude rate of the current signal input of supply frequency is Gain_FreqI,
Phase changing capacity is Phase_, FreqI,
A straight slope of correction of amplitude rate is A_Gain_FreqI,
Intercept is B_Gain_FreqI,
A straight slope of phase changing capacity is A_Phase_FreqI,
Intercept is B_Phase_FreqI,
Current supply frequency Freq, then a straight line of Jiao Zhenging can be expressed as follows.
Gain_FreqV＝A_Gain_FreqV×Freq+B_Gain_FreqV....(FV1)
Gain_FreqI＝A_Gain_FreqI×Freq+B_Gain?FreqI....(FI1)
Phase_FreqV＝A_Phase_FreqV×Freq+B_Phase_FreqV...(FV2)
Phase_FreqI＝A_Phase_FreqI×Freq+B_Phase_FreqI...(FI2)
Set the slope and the intercept of a straight line, making Gain_FreqV and Gain_FreqI is to be 1 under the situation of the supply frequency when initially adjusting in current supply frequency.Set the slope and the intercept of a straight line again, making Phase_FreqV and Phase_FreqI is to be 0 under the situation of the supply frequency when initially adjusting in current supply frequency, and the variable quantity of leading direction is for just, and the variable quantity of the direction that lags is for bearing.So the supply frequency when storing initial is adjusted in advance from current frequency and straight slope conversion intercept, at this moment can reduce the set amount of intercept.Also can freely set or change the slope and the intercept of a straight line.Therefore, (for example change into resistor voltage divider circuit, change into type CT circuit along separate routes) when the circuit of change voltage signal input medium and current signal input medium is formed, can only change the slope of a straight line and the value of intercept from the CT circuit from the PT circuit.Corrector (FV1), (FI1), (FV2), (FI2) characteristic are all similar with Fig. 6, thereby omit and illustrate.
Again, the correction of amplitude rate that voltage signal input medium and current signal input medium are added up to is Gain_Freq, and phase changing capacity is Phase_Freq, and
Gain_Freq＝(A_Gain_FreqV+A_Gain_FreqI)×Freq+B_Gain_FreqV+B_Gain_FreqI
Phase_Freq＝(A_Phase_FreqV+A_Phase_FreqI)×Freq+B_Gain-FreqV+B_Phase_FreqI
Then can reduce the set amount of operand and straight slope and intercept.
Embodiment 4
Obtain the temperature T emp (supposing that here any AD transducer temperature is all roughly the same) of current AD transducer from temperature survey means 56, utilize straight line to calculate the voltage signal input of temperature and current signal is imported and the correction of amplitude rate (inverse of amplitude change rate) and the phase changing capacity of AD transducer.
(1) correction that the voltage signal of temperature is imported is established
The correction of amplitude rate is Gain_TempV, and its phase changing capacity is Phase_TempV,
A straight slope of correction of amplitude rate is A_Gain_TempV, and intercept is B_Gain_TempV,
A straight slope of phase changing capacity is A_Phase_TempV, and intercept is B_Phase_TempV;
(2) correction that the current signal of temperature is imported is established
The correction of amplitude rate is Gain_TempI, and its phase changing capacity is Phase_TempI,
A straight slope of correction of amplitude rate is A_Gain_TempI, and intercept is B_Gain_TempI,
A straight slope of position variable quantity is A_Phase_TempI, and intercept is B_Phase_TempI;
(3) to the correction of the AD transducer of temperature, establish
The correction of amplitude rate is Gain_TempAD, and its phase changing capacity is Phase_TempAD,
A straight slope of correction of amplitude rate is A_Gain_TempAD, and intercept is B_Gain_TempAD,
A straight slope of phase changing capacity is A_Phase_TempAD, and intercept is B_Phase_TempAD, and establishing Current Temperatures again is Temp; Then corrector is as follows.
Gain_TempV＝A_Gain_TempV×Temp+B_Gain_TempV...(TV1)
Gain_TempI＝A_Gain_TempI×Temp+B_Gain_TempI...(TI1)
Gain_TempAD＝A_Gain_TempAD×Temp+B_Gain_TempAD...(TA1)
Phase_TempV＝A_Phase_TempV×Temp+B_Phase_TempV...(TV2)
Phase_TempI＝A_Phase_TempI×Temp+B_Phase_TempI...(TI2)
Phase_TempAD＝A_Phase_TempAD×Temp+B_Phase_TempAD..(TA2)
Set the slope and the intercept of a straight line, making Gain_TempV, Gain_TempI and Gain_TempAD is to be 1 under the situation of the temperature when initially adjusting at Current Temperatures.And, set the slope and the intercept of a straight line, the leading direction variable quantity that makes Gain_TempV, Gain_TempI and Gain_TempAD is being for just, and the direction that lags variable quantity is for bearing, and is to be 0 under the situation of the temperature when initially adjusting at Current Temperatures.So the temperature when storing initial is adjusted in advance from current temperature and straight slope conversion intercept, at this moment can reduce the set amount of intercept.Also can freely set or change the slope and the intercept of a straight line.Therefore, (for example change into resistor voltage divider circuit, change into type CT circuit along separate routes) when the circuit of change voltage signal input medium and current signal input medium is formed, can only change the slope of a straight line and the value of intercept from the CT circuit from the PT circuit.
Again, the correction of amplitude rate that voltage signal input medium and current signal input medium and AD transducer are added up to is Gain_Temp, and phase changing capacity is Phase_Temp, and
Gain_Temp＝
(A_Gain_TempV+A_Gain_TempI+A_Gain_TempAD)×
Temp+B_Gain_TempV+B_Gain_TempI+B_Gain_TempAD
Phase_Temp＝
(A_Phase_TempV+A_Phase_TempI+A_Phase_TempAD)×
Temp+B_Gain_TempV+B_Phase_TempI+B_Phase_TempAD
Then can reduce the set amount of operand and straight slope and intercept.
In order to make the above-mentioned correction of amplitude rate and the phase changing capacity of calculating of computing reflection of power, reactive power, the amplitude phase correction matrix (above-mentioned) when initially adjusting multiply by correction of amplitude rate and phase changing capacity correction matrix.The amplitude phase correction matrix of its result for using in the actual operation.
Net amplitude corrected rate and phase changing capacity are to select to wish the parameter of correction arbitrarily from voltage effective value, current effective value, supply frequency and temperature, the combined influence of selected parameter.When selecting whole parameter, establishing the net amplitude corrected rate is Gain_all_N, and total phase changing capacity is Phase_all_N, then becomes formula (3).
Gain_all_N＝Gain_Vrms_N×Gain_Irms_N×Gain_Freq×Gain_Temp
Phase_all_N＝Phase_Vrms_N+Phase_Irms_N+Phase_Freq+Phase_Temp
(formula 3)
Therefore, the amplitude phase correction matrix that uses in the actual operation is following formula (4).
The amplitude phase correction matrix that uses in the computing=
Amplitude phase correction matrix during Gain_all_N * adjustment
When making voltage effective value, the current effective value above-mentioned correction of amplitude rate of calculating of reflection and phase changing capacity, effective value and phase-independent, thereby the result of conversion coefficient 181,183,281,283 gained the correction of amplitude rate of voltage effective value Vrms-N, current effective value Irms-N can be multiply by initial adjust the time is as the conversion coefficient that uses in the actual operation.
The calculating of the phase amplitude correction matrix coefficient that uses in the actual operation is not that each sample frequency is all carried out, but can calculate, and upgrade the result in the time interval (for example per 0.5 second～several seconds) that appreciable error appears in each identification such as each effective value, variation of temperature.Therefore, only increase operand and do not increase the operand of computational calculation power associated volume at ordinary times when upgrading, computational load does not increase.
As described above, when measuring the power associated volume, utilize the temperature of the voltage effective value, current effective value, supply frequency and the AD transducer that detect to proofread and correct, thereby can measure the power associated volume accurately.Although understand the example utilize voltage effective value, current effective value, frequency and temperature to proofread and correct, but also can utilize wherein at least any parameter to proofread and correct, this point is in example 2 explanations.
Owing to utilize the rotation matrix phase calibration, can proofread and correct at short notice.
Again because being applicable to have makes with respect to the voltage-phase of electric current with respect to 90 ° of phase tranformation means of 90 ° of phase places of current phase conversion of voltage, utilizes the output of 90 ° of phase tranformation means to ask the reactive power computing means of reactive power and ask the device of the active power computing means of active power from electric current and voltage, can dual-purpose obtain amplitude phase correction matrix is used when adjusting the rotation matrix calculation function and the rotation matrix calculation function of above-mentioned correction usefulness.
It is that the temperature of AD transducer is illustrated that 1 pair of example is established temperature, but also can adopt the temperature of the arithmetic unit that the computing of carrying out above explanation uses.
Example 2
7 correction of amplitude rates of 4 calculation of parameter and 7 phase changing capacities such as temperature of above-mentioned example 1 usefulness voltage effective value, current effective value, supply frequency and AD transducer, but also can only select arbitrary project wherein to calculate.For example, only the phase changing capacity of current signal input relies on when big current effective value and supply frequency, thereby wishes then can only calculate Phase_Irms_N, Phase_FreqI only to its correction.Sundry item is also identical.
Example 3
Above-mentioned example 2 only selects any project to calculate, but after selecting whole projects, especially to the project of not proofreading and correct by following such slope and intercept that it proofreaies and correct a straight line of usefulness of setting, also can realize same running.
That is, the correction of amplitude rate of the project of not wanting is set at 0 with the slope of a straight line, and intercept is set at 1.The phase changing capacity of project not is set at 0 with the slope of a straight line, and intercept is set at 0.
Example 4
After also available floating point calculation calculates the coefficient of the amplitude phase correction matrix that uses in the actual operation, when upgrading amplitude phase correction matrix, from the floating point conversion and be set at fixed point.Thus, computing at ordinary times only the fix multiplication and the addition of radix point, arithmetic speed improves.
Example 5
Above-mentioned example 4 is taken as fixed point when upgrading amplitude phase correction matrix, but also available fixed point carries out the calculating of the amplitude phase correction matrix coefficient that uses in the actual operation.
In fact, slope and the intercept with a straight line is set at fixed point.Parameters such as voltage effective value, current effective value, supply frequency and temperature when obtaining calculating correction of amplitude rate and phase changing capacity with fixed point again.Thus, when calculating correction of amplitude rate and phase changing capacity, the multiplication and the addition of the radix point that only fixes.
Because the floating point calculation amount of required sine value, cosine value when removing computing phase changing capacity correction matrix, can have for example coefficient of the left-handed matrix of 0.01 degree, the left-handed matrix of 0.1 degree, the left-handed matrix of 1 degree by the acquiescence of fixed point in advance, and after calculating phase changing capacity, multiply by described left-handed matrix, thereby calculate the phase changing capacity correction matrix.
In the above-mentioned example, when phase changing capacity is 1.24 degree (in advance), can calculate the phase changing capacity correction matrix by the left-handed matrix of computing 1 degree * (left-handed matrix of 0.1 degree) 2 * (left-handed matrix of 0.01 degree) 4.
Example 6
The phase changing capacity of the size of current that will detect as shunt type CT is non-linear, when being difficult to a linear correction, by setting slope many straight lines different with intercept such as 2 or 3, and the intersection point that switches with straight line is a straight line of border calculation correction amount, proofreaies and correct.
For example, adopting CT along separate routes in current signal input, and the phase changing capacity of the size of current that will detect describes when being non-linear as an example.Fig. 7 (a) illustrates example characteristic 95 at this moment.In the characteristic 95 of Fig. 7 (a), be the border with about 10% of load, the load that is lighter than this border is compared with the part that overweights this border, and phase error sharply strengthens.At this moment, prepare for example 2 straight lines that calculate phase changing capacity Phase_Irms_N.Making the slope that calculates the 1st straight line 96 that phase changing capacity uses is A1_Phase_Irms, and intercept is B1_Phase_Irms, and the slope of the 2nd straight line 97 is A2_Phase_Irms, and intercept is B2_Phase_Irms.At the moment of setting 2 straight lines, the intersection point of calculated line 96 and straight line 97.
Straight-line intersection
Therefore, current Irms_N is the Irms of straight-line intersection when above, uses the 1st straight line 96, establishes
Phase_Irms_N＝A1Phase_Irms×Irms_N+B1_Phase_Irms
And current Irms_N uses the 2nd straight line 97 when being Irms less than straight-line intersection, establishes
Phase_Irms_N＝A2_Phase_Irms×Irms_N+B2_Phase_Irms
Like this, the phase error 98 shown in Fig. 7 (b) is such, can be with higher precision measure power associated volume.
But the curve of binding characteristic 95 uses more straight line certainly.
Even the temperature of the AD transducer in the size of the voltage and current that power associated volume measurement mechanism of the present invention will detect, frequency, the computing causes voltage signal input medium, current signal input medium and AD transducer characteristic variations separately, also can operand few, memory capacity is little and at high speed it is proofreaied and correct, always measure accurately, thereby can precision measure the power associated volume than the highland.
Claims (6)
1. power associated volume measurement mechanism is characterized in that having:
To be loaded in current sensor on the line of electric force and voltage sensor senses to current signal and the voltage signal AD translation circuit that carries out digital conversion respectively;
When asking the frequency of described voltage signal, after the voltage signal of described AD translation circuit output and current signal being multiplied each other in each sample frequency, utilize the high fdrequency component in the value after the filtering of wave digital lowpass filter means is multiplied each other, power W_in_N before the output calibration, thereby the power associated volume operational part of the power associated volume of the described line of electric force of computing, N=1 wherein, 2,3; And
As parameter, utilize the correction of storage in advance to calculate correcting value in described voltage signal, current signal and the frequency at least one, proofread and correct the correction means of described power associated volume with a straight line.
2. power associated volume measurement mechanism is characterized in that having:
To be loaded in current sensor on the line of electric force and voltage sensor senses to current signal and the voltage signal AD translation circuit that carries out digital conversion respectively;
Detect the Temperature Detector of the temperature of described AD translation circuit;
When asking the frequency of described voltage signal, after the voltage signal of described AD translation circuit output and current signal being multiplied each other in each sample frequency, utilize the high fdrequency component in the value after the filtering of wave digital lowpass filter means is multiplied each other, power W_in_N before the output calibration, thereby the power associated volume operational part of the power associated volume of the described line of electric force of computing, N=1 wherein, 2,3; And
As parameter, utilize the correction of storage in advance to calculate correcting value described temperature, proofread and correct the correction means of described power associated volume with a straight line.
3. power associated volume measurement mechanism as claimed in claim 1 or 2 is characterized in that described correction means is proofreaied and correct the amplitude or the phase place of described power associated volume.
4. power associated volume measurement mechanism as claimed in claim 3, it is characterized in that, amplitude, phase correction matrix during according to initial the adjustment, utilize the following formula of representing by the rotation matrix computing to carry out the phase correction of the described power associated volume of described correction means:
W_out_N: the active power after the correction
Var_out_N: the reactive power after the correction
Phase_all_N: answer phase calibration from what parameter obtained
W_in_N: the active power before proofreading and correct
Var_in_N: the reactive power before proofreading and correct.
5. power associated volume measurement mechanism as claimed in claim 1 or 2 is characterized in that, power associated volume operational part has:
The active power computing means of asking active power from the described current signal and the voltage signal of the output of described AD translation circuit;
The 90 degree phase tranformation means that make described voltage signal spend phase places with respect to the phase tranformation 90 of described voltage signal with respect to the phase place or the described current signal of described current signal; And
Ask the reactive power computing means of reactive power according to the phase place output after the described 90 degree phase tranformation means conversion.
6. power associated volume measurement mechanism as claimed in claim 4 is characterized in that, described updating formula is corresponding to according to the difference of the phase changing capacity of the variation of described parameter and definite specialized range decision.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003007778A JP4310113B2 (en) | 2003-01-16 | 2003-01-16 | Electric power related quantity measuring device |
| JP2003007778 | 2003-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1517715A CN1517715A (en) | 2004-08-04 |
| CN1249443C true CN1249443C (en) | 2006-04-05 |
Family
ID=32897772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03157783 Expired - Fee Related CN1249443C (en) | 2003-01-16 | 2003-08-29 | Power relevance quantity measuring device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4310113B2 (en) |
| CN (1) | CN1249443C (en) |
| AU (1) | AU2003204811B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1925373B (en) * | 2005-09-02 | 2011-07-13 | 中兴通讯股份有限公司 | Radio-frequency RMS power detecting device and method |
| JP5487084B2 (en) * | 2010-11-19 | 2014-05-07 | 株式会社メガチップス | Power supply |
| KR101133352B1 (en) | 2010-12-22 | 2012-04-19 | 한국전력공사 | Electronic watt-hour meter and method of calculating watt-hour |
| EP2884294A1 (en) * | 2013-12-13 | 2015-06-17 | Siemens Aktiengesellschaft | Method for determining the supply voltages of a consumer and consumer |
| JP6486205B2 (en) * | 2015-06-03 | 2019-03-20 | 大崎電気工業株式会社 | Phase adjustment system for power measurement |
| JP6631915B2 (en) * | 2016-03-22 | 2020-01-15 | パナソニックＩｐマネジメント株式会社 | Power measurement system |
| FR3123728B1 (en) * | 2021-06-07 | 2023-04-28 | Sagemcom Energy & Telecom Sas | Calibration of a Rogowski sensor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4994735A (en) * | 1988-05-16 | 1991-02-19 | Leedy Glenn J | Flexible tester surface for testing integrated circuits |
| JPH0595030A (en) * | 1991-10-02 | 1993-04-16 | Nec Corp | Automatic tester |
| JPH09105761A (en) * | 1995-10-09 | 1997-04-22 | Nitto Denko Corp | Manufacture of probe structure and, circuit board used therefor |
| JPH10335401A (en) * | 1997-06-05 | 1998-12-18 | Nec Corp | Semiconductor device and method of mounting the same |
| US6392251B1 (en) * | 2000-10-17 | 2002-05-21 | Advanced Micro Devices, Inc. | Test structures for identifying open contacts and methods of making the same |
-
2003
- 2003-01-16 JP JP2003007778A patent/JP4310113B2/en not_active Expired - Lifetime
- 2003-06-17 AU AU2003204811A patent/AU2003204811B2/en not_active Ceased
- 2003-08-29 CN CN 03157783 patent/CN1249443C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP4310113B2 (en) | 2009-08-05 |
| CN1517715A (en) | 2004-08-04 |
| AU2003204811B2 (en) | 2004-12-02 |
| JP2004219288A (en) | 2004-08-05 |
| AU2003204811A1 (en) | 2004-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1109390C (en) | Device and method for stabilizing electric power system | |
| CN1649334A (en) | Apparatus and method for adjusting quadrature modulator, communication apparatus and program | |
| CN1088511C (en) | Arrangement for linearization and temperature compensation of sensor signals | |
| CN1249443C (en) | Power relevance quantity measuring device | |
| CN1063889C (en) | Quartz oscillator device and its adjusting method | |
| CN1118945C (en) | Radio transmitter and radio communication method | |
| CN1168572A (en) | Radio transmitter apparatus and method | |
| CN2724218Y (en) | Device for estimating recharge rate of cell | |
| CN1694350A (en) | Class-D amplifier | |
| CN1969459A (en) | Digital predistortion system and method for linearizing an RF power amplifier with nonlinear gain characteristics and memory effects | |
| CN1691513A (en) | PLL circuit, radio-communication equipment and method of oscillation frequency control | |
| CN1262073C (en) | Frequency hooping communication device with simple structure | |
| CN1214533C (en) | Temperature compensation device of matched crystal | |
| CN1231026C (en) | Portable radio system, portable radio device used therein and frequency error prediction method | |
| CN1441908A (en) | Method for measuring motor constant of induction motor | |
| CN1518309A (en) | Direct conversion reciever for calibrating phase and gain mismatched | |
| CN101046505A (en) | Battery capacity calculation method | |
| CN1667942A (en) | Rotor position presuming method and apparatus, motor control method, compressor and program | |
| CN1615434A (en) | Method and apparatus for processing electrochemical signals | |
| CN1701505A (en) | Modulator and correction method thereof | |
| CN1352822A (en) | Predistortion type distortion compensatino amplifier | |
| CN1914839A (en) | Reception device | |
| CN101080911A (en) | Calibrating amplitude and phase imbalance and DC offset of an analog i /q modulator in a high-frequency transmitter | |
| CN101032088A (en) | Receiver apparatus and electronic device using the same | |
| CN1918798A (en) | Transmission power control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060405 Termination date: 20200829 |