CN1076541C - Driving control device of synchro and detecting device for A. C. signal - Google Patents
Driving control device of synchro and detecting device for A. C. signal Download PDFInfo
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- CN1076541C CN1076541C CN98107378A CN98107378A CN1076541C CN 1076541 C CN1076541 C CN 1076541C CN 98107378 A CN98107378 A CN 98107378A CN 98107378 A CN98107378 A CN 98107378A CN 1076541 C CN1076541 C CN 1076541C
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Abstract
The present invention aims to detect the quantity of electricity accurately even when the frequency of an AC signal is fluctuated. An excitation controller and a voltage detector 1A for the synchronous motor has an amplitude arithmetic means 5, which converts the quantity of electricity detected into a digital signal for a fixed period and into which the converted quantity of electricity is inputted and which outputs the amplitude arithmetic result B of the value of a digital signal D on the basis of the digital signal, and an integral arthmetic means 6 adding the absolute value of the digital signal D by a fixed number and outputting an integral arithmetic result S, and the amplitude arithmetic result B and the integral arithmetic result S are changed and outputted according to the frequency detecting signal F of the AC voltage V0.
Description
The present invention relates to the excitation control device of ac signal checkout gear and synchronous motor, even this device is under the situation that the frequency of ac electric changes, still can be correctly the ac electric of the output voltage of the synchronous motor that is connected with electric power system etc. be measured, be can be used for control in addition.
Such as automatic voltage adjusting device by the output voltage of synchronous motor (generator) is controlled (below be called AVR) etc., but the alternating voltage of offset of sinusoidal ripple is measured.In the mensuration of this sinusoidal wave alternating voltage, include to the amplitude of voltage carry out computing the amplitude compute mode, integrated value is carried out the integral operation mode of computing, is the modes such as standardization compute mode that direct current signal carries out the standardization computing in the phase transition of analog signal.
Below with reference to Figure 20 the voltage check device of existing employing amplitude compute mode is described.
At first, in A/D conversion process portion 2, the instantaneous value of alternating voltage V0 is converted to digital signal according to some cycles, and the digital signal matrix D is as the digital signal output in each cycle.In arithmetic processing section 3, include amplitude arithmetical organ 5, pair carry out computing with the effective value of alternating voltage V0 or the voltage detection signal V1 of the proportional relation of mean value according to the digital signal matrix D, and with its output.
As shown in figure 21, in the occasion of alternating voltage V0, the compute mode of amplitude arithmetical organ 5 is to carry out computing according to following formula (1) under 1/12 times the situation in cycle of alternating voltage V0 in the change-over period of A/D conversion process portion 2.
[mathematical formulae 1]
B=K*SQRT|D-32-(D-0*D-6) | formula (1)
Here, K: the constant that amplitude is converted to effective value or mean value
B: amplitude operation result
D-n: the value of digital signal matrix D (before n time)
SQRT: square root
Here, the amplitude of input voltage is that the formula (1) of A is represented according to following formula (2).
[mathematical formulae 2]
B=K*SQRT| (Asin (wt-pi/2)) 2-Asinwt*Asin (wt-π) | formula (2)
In addition, when adopting the right of trigonometric function breakdown (2), represent according to following formula (3).
B=K*A formula (3)
According to formula (3), judge the proportional relation of amplitude A of amplitude operation result B and alternating voltage V0 and do not have arithmetic eror.
Figure 22 is the key diagram of the frequency characteristic of expression amplitude subtraction mode, and when the frequency of the reference frequency F0, the alternating voltage V0 that set up for the condition that makes formula (2) changed, the voltage detection signal V1 of amplitude operation result B changed according to diagramatic way.This mode has following characteristic, and promptly according to reference frequency F0 arithmetic eror seldom and the occasion that changes of frequency, the voltage detection signal V1 of amplitude computing output B reduces.
Below with reference to Figure 23 the voltage check device that adopts existing integral operation mode is described.
The voltage check device of the integral operation mode among Figure 23 with the internal mechanism of the arithmetic processing section among Figure 20 3 as integral operation mechanism 6, according to the output (digital signal matrix D) that is used for the instantaneous value of alternating voltage V0 is converted to according to some cycles the A/D conversion process portion 2 of digital signal, to carrying out computing with the effective value of alternating voltage V0 or the voltage detection signal V1 of the proportional relation of mean value, and with its output.
[mathematical formulae 3]
Here, L: the constant that integrated value is converted to effective value or mean value
S: integral operation result
D-n: the value of digital signal matrix (before n time)
Figure 24 is the frequency characteristic figure of integral operation mode.According to this compute mode, the value big more (in the sampling period is certain occasion, and the frequency of alternating voltage V0 reduces) of the hits N in the cycle of relative AC signal, then operational precision is high more.
Such as, if be 1/12 times the occasion in the cycle of alternating voltage V0, carrying out the integral operation of half period in the change-over period of A/D conversion process portion 2, sampling number N is 6.In this occasion, has following characteristic, if promptly be about 1.7% in arithmetic eror (the fluctuation width among the figure).The occasion that changes in the relative reference frequency F0 frequency of alternating voltage V0 is a prerequisite with the integral operation of half period, and in the lower zone of frequency, sampling number N increases, and has higher precision.
Below with reference to Figure 25 the voltage check device that adopts the existing standard compute mode is described.
In the figure, voltage check device 1 comprises: the rectification handling part 9 that alternating voltage V0 is converted to direct voltage V2, make this direct voltage V2 keep level and smooth filter 10, A/D conversion process portion 11, this A/D conversion process portion 11 will be converted to digital signal through the direct voltage V3 of smoothing processing according to some cycles, export digital signal matrix D 1 afterwards, arithmetic processing section 3, this arithmetic processing section 3 is carried out computing according to 1 pair of digital signal matrix D with the effective value of alternating voltage V0 or the voltage detection signal V1 of the proportional relation of mean value, and output, arithmetic processing section 3 is made of standardization arithmetical organ 12, and this standardization arithmetical organ 12 makes digital signal matrix D 1 become signal with effective value or the proportional relation of mean value.
By this standardization arithmetical organ 12, carry out computing according to formula (5).
[mathematical formulae 4]
G=M*D-0 formula (5)
Here, M: the constant that the value of direct voltage is converted to effective value or mean value
G: standardization operation result
D-n: the value of digital signal matrix (before n time)
According to above-mentioned compute mode, though after alternating voltage V0 being carried out rectification, carrying out smoothing processing, carry out the A/D conversion process, the waveform after the rectification of alternating voltage V0 does not contain fluctuation, and the fluctuation of removing by filter does not present fluctuation in output.
Figure 26 is the frequency characteristic figure of standardization compute mode, because when passing through this compute mode, when the frequency relative datum frequency F0 of input voltage V0 increased, the effect of filter 10 was strengthened, fluctuation reduces, thereby can obtain the higher characteristic of voltage detecting precision.
Here, when to amplitude compute mode, integral operation mode, when the standardization compute mode compares, near reference frequency F0, the amplitude compute mode has the highest operational precision.The integral operation mode is at relative sampling number N, near the zone of its precision beyond different reference frequency F0, and its operational precision of relative amplitude compute mode is higher.Near the zone of standardization compute mode beyond the reference frequency F0 that relatively the performance of filter precision is different, its operational precision of relative amplitude compute mode is higher.
In addition, when integral operation mode and standardization compute mode are compared, the occasion that error in reference frequency F0 is identical, if because the frequency of integral operation mode reduces, then precision is higher, and if the frequency of standardization compute mode when increasing, then precision is higher, in lower frequency, preferably adopt the integral operation mode like this, in higher frequency, preferably adopt the standardization compute mode.
But, the mensuration that adopts the amplitude compute mode to carry out alternating voltage has following shortcoming, promptly as shown in figure 22, in frequency is the occasion of the reference frequency F0 of alternating voltage V0, has the less characteristic of error that causes because of compute mode, because the variation of frequency, the voltage detection signal V1 that amplitude operation result B produces reduces.Such as, be 1.5 times the occasion of reference frequency F0 in the frequency of alternating voltage V0, the amplitude operation result B that calculates by amplitude arithmetical organ 5 is 50%.It also can be as the formula (1), adopts according to the data of per 90 degree (the data D-3 before 3 samplings etc.) in the basic wave and carry out calculation mode, when the frequency shift of signal to be detected, because relative 90 degree produce deviations, can produce bigger error like this.
In addition, the integral and calculating mode has following shortcoming, promptly can be often because of the compute mode with following characteristic produce error, and this characteristic refers to the occasion that the frequency at alternating voltage V0 changes, and when frequency was low, sampling number N increased, and precision is higher.It also can be as the formula (4), adopt magnitude of voltage to the certain hour mode of calculating mean value then that adds up, but when frequency changed, Zheng Xianbo limit of integration changed relatively, thereby can not carry out stable output.Have following shortcoming like this, promptly when obtaining bigger limit of integration, stability improves, otherwise but, reactive meeting variation.
Have, the standardization compute mode has following shortcoming again, promptly can be often produces error because of the fluctuation of input voltage V0 with following characteristic, this characteristic refers to because when the frequency of input voltage V0 is higher, the effect of filter 10 increases, and fluctuation reduces, and the voltage detecting precision is higher.In addition, have the analog circuit of rectification handling part 9 and filter 10 etc., inside can be subjected to the influence of temperature drift or high frequency, thereby precision can be not higher.
In the manner described above, when error occurring in the voltage detecting, for having the excitation control device of synchronous motor that controlled quentity controlled variable is carried out the automatic voltage adjusting device of computing in the mode that voltage is detected, also can produce error in controlled quentity controlled variable, synchronous motor can produce wrong output voltage, thereby can produce adverse influence to electric power system.
Also can produce following situation in addition, it is the output voltage of synchronous motor, startup at synchronous motor, or have than the control of turning round of the zone of large deviation in fundamental frequency in the stopped process with system, the number of revolutions of synchronous motor can change the measure of the influence that produces in the time of must having the frequency that tackles ac electric to change like this during this external normal operation.
Therefore, the object of the present invention is to provide the excitation control device of a kind of voltage check device and synchronous motor, the excitation control device of this voltage check device and synchronous motor is in the detection of ac electric, even under the situation that the frequency of its ac electric changes, still can carry out the detection of degree of precision, and can be used for control the effective value or the mean value of electric weight (voltage, electric current etc.).
(1) the excitation control device of synchronous motor of the present invention is controlled the output voltage of the synchronous motor that is connected with AC electric power systems to the exciting bank adjustment of exciting circuit of excitation synchronous motor, and this device comprises:
A/D conversion process mechanism, this A/D conversion process mechanism imports the output voltage of above-mentioned synchronous motor, and the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, the digital signal that these a plurality of arithmetical organs adopt above-mentioned A/D conversion process mechanism to be exported, according to the different a plurality of compute modes of frequency characteristic, the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value carried out computing;
Frequency detecting mechanism, the frequency of the output AC electric weight of above-mentioned synchronous motor detects in this frequency detecting mechanism;
Output mechanism, this output mechanism be according to the detected frequency of said frequencies testing agency, and any one output in above-mentioned a plurality of arithmetical organs is exported as the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The automatic voltage adjusting mechanism, the electric weight detection signal that this automatic voltage adjusting mechanism is exported according to above-mentioned output mechanism encourages the control computing, and the output of the excitation control signal that is sent to above-mentioned exciting bank is adjusted.
(2) in above-mentioned the 1st scheme, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation or ac electric is carried out at least a compute mode in the standardization compute mode of standardization computing, the effective value or the suitable electric weight detection signal of mean value of the output voltage of above-mentioned synchronous motor carried out computing.
(3) in addition, in above-mentioned (2) scheme, above-mentioned output mechanism is following output mechanism, when it is arranged in the prescribed limit of fundamental frequency of the ac electric that comprises above-mentioned electric power system in the detected frequency of said frequencies testing agency, export the electric weight detection signal that above-mentioned basic operation mechanism is sent, when the detected frequency of said frequencies testing agency is positioned at beyond the afore mentioned rules scope, export the electric weight detection signal that above-mentioned preparation arithmetical organ sends.
(4) in addition, the excitation control device of synchronous motor of the present invention is controlled the output voltage of the synchronous motor that is connected with AC electric power systems to the exciting bank adjustment of exciting circuit of excitation synchronous motor, and this device comprises:
A/D conversion process mechanism, this A/D conversion process mechanism imports the output voltage of above-mentioned synchronous motor, and the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
Basic operation mechanism, the digital signal that this basic operation mechanism adopts above-mentioned A/D conversion process mechanism to be exported, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal of being exported by above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation, or ac electric is carried out any in the standardization compute mode of standardization computing, the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value carried out computing;
Output mechanism, this output mechanism comprise high value preferential shop, and this high value preferential shop is selected above-mentioned basic operation mechanism and prepared the signal of the high value in each electric weight detection signal that arithmetical organ exports, and with its output;
The automatic voltage adjusting mechanism, the electric weight detection signal that this automatic voltage adjusting mechanism is exported according to above-mentioned output mechanism encourages the control computing, and the output of the excitation control signal that is sent to above-mentioned exciting bank is adjusted.
(5) also have, ac signal checkout gear of the present invention comprises:
A/D conversion process mechanism, this A/D conversion process mechanism input AC electric weight, the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, these a plurality of arithmetical organs adopt the digital signal by the output of above-mentioned A/D conversion process mechanism, carry out computing according to the effective value or the suitable electric weight detection signal of mean value of a plurality of different compute modes pair and above-mentioned ac electric;
Frequency detecting mechanism, the frequency of above-mentioned ac electric detects in this frequency detecting mechanism;
Output mechanism, this output mechanism be according to the detected frequency of said frequencies testing agency, and any one output in above-mentioned a plurality of arithmetical organs is exported as the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value.
(6) in addition, in above-mentioned the 5th scheme, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing;
(7) also have, in above-mentioned the 5th scheme, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the standardization compute mode of ac electric being carried out the standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
Also have, (8) in above-mentioned the 7th scheme, above-mentioned preparation arithmetical organ is following arithmetical organ, this arithmetical organ adopts and will carry out that rectification is handled and the direct current measurement that obtains is converted to the 2nd digital signal that A/D conversion process mechanism is exported of digital signal to above-mentioned input electric weight, and above-mentioned electric weight detection signal is carried out computing.
(9) also have, in above-mentioned the 5th scheme, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The 1st preparation arithmetical organ, the 1st preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing;
The 2nd preparation arithmetical organ, the 2nd preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the standardization compute mode of ac electric being carried out the standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
(10) also have, in above-mentioned (6), (7), (9) scheme, above-mentioned output mechanism is following output mechanism, this output mechanism is exported the electric weight detection signal that above-mentioned basic operation mechanism sends when the detected frequency of said frequencies testing agency is positioned at the prescribed limit of fundamental frequency of the regulation that comprises above-mentioned ac electric, export the electric weight detection signal that above-mentioned preparation arithmetical organ sends when the detected frequency of said frequencies testing agency is positioned at beyond the afore mentioned rules scope.
(11) also have, in above-mentioned (6), (7), (9), (10) scheme, above-mentioned output mechanism comprises following switching selection mechanism, and this switching selection mechanism is selected to switch or switch each electric weight detection signal that above-mentioned a plurality of arithmetical organ is exported in the mode of computing weighted, and with its output.
(12) the switching selection mechanism of above-mentioned output mechanism is for being provided with the switching selection mechanism of regulation magnetic hysteresis width in handoff boundary.
(13) also have, ac signal checkout gear of the present invention comprises:
A/D conversion process mechanism, this A/D conversion process mechanism input AC electric weight, the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, these a plurality of arithmetical organs adopt the digital signal by the output of above-mentioned A/D conversion process mechanism, according to a plurality of different compute modes, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value are carried out computing;
Output mechanism, this output mechanism comprises high value selection mechanism, the high-value signal in each electric weight detection signal that above-mentioned a plurality of arithmetical organ exports is selected in this high value selection mechanism, with its as with the effective value or the suitable electric weight detection signal output of mean value of above-mentioned ac electric.
(14) in addition, in above-mentioned the 13rd scheme, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation or ac electric is carried out at least a compute mode in the standardization compute mode of standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
Fig. 1 is the structure chart of the excitation control device of the synchronous motor of the present invention the 1st embodiment;
Fig. 2 is the structure chart of the 1st embodiment of voltage check device of the present invention;
Fig. 3 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Fig. 2;
Fig. 4 is the frequency characteristic figure of the function generating mechanism of another embodiment among Fig. 2;
Fig. 5 is the structure chart of the 2nd embodiment of voltage check device of the present invention;
Fig. 6 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Fig. 5;
Fig. 7 is the structure chart of the 3rd embodiment of voltage check device of the present invention;
Fig. 8 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Fig. 7;
Fig. 9 is the frequency characteristic figure of the function generating mechanism of another embodiment among Fig. 7;
Figure 10 is the structure chart of the 4th embodiment of voltage check device of the present invention;
Figure 11 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Figure 10;
Figure 12 is the structure chart of the 5th embodiment of voltage check device of the present invention;
Figure 13 is the structure chart of the 6th embodiment of voltage check device of the present invention;
Figure 14 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Figure 13;
Figure 15 is the structure chart of the 7th embodiment of voltage check device of the present invention;
Figure 16 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Figure 15;
Figure 17 is the frequency characteristic figure of the function generating mechanism of another embodiment among Figure 15;
Figure 18 is the structure chart of the 8th embodiment of voltage check device of the present invention;
Figure 19 is the frequency characteristic figure of the function generating mechanism in the voltage check device that is arranged among Figure 18;
Figure 20 is the structure chart of the voltage check device of existing employing amplitude compute mode;
Figure 21 is the key diagram of the amplitude compute mode among Figure 20;
Figure 22 is the performance plot of the amplitude compute mode among Figure 20;
Figure 23 is the structure chart of the voltage check device of existing employing integral operation mode;
Figure 24 is the performance plot of the integral operation mode among Figure 23;
Figure 25 is the structure chart of the voltage check device of existing employing standardization compute mode;
Figure 26 is the performance plot of the standardization compute mode among Figure 25.
A description will be given of an embodiment in accordance with the present invention with reference to the accompanying drawings.
Fig. 1 is the structure chart of the excitation control device of the synchronous motor of the present invention the 1st embodiment.
In Fig. 1, the output voltage of the synchronous motor 20 that is connected with AC electric power systems and output current are input in the excitation control device 23 as ac electric (alternating voltage V0, alternating current I0) by transformer PT21 and current transformer CT22.Excitation control device 23 has the 1X of ac signal testing agency and automatic voltage is adjusted arithmetical organ 24, it encourages the adjustment computing, by the excitation control signal E that constitutes its controlled quentity controlled variable exciting bank 25 is controlled, and the exciting circuit of synchronous motor is encouraged.
The electric weight that the effective value of 1X pair of ac signal testing agency and ac signal V0 and/or I0 or mean value are suitable carries out computing, output electric weight detection signal V1 and/or I1.Afterwards, automatic voltage is adjusted arithmetical organ 24 according to these signals, adjusts computing (is that zero mode is calculated controlled quentity controlled variable such as the deviation according to voltage setting value and detected value), will encourage control signal E towards exciting bank 25 outputs.
Fig. 2 is the structure chart of the 1st embodiment of ac signal testing agency of the present invention (voltage check device).In Fig. 2, voltage check device 1A constitutes in the following manner, it is made up of A/D conversion process portion 2 and arithmetic processing section 3A, alternating voltage V0 inputs to A/D conversion process portion 2, the output of this A/D conversion process portion 2 inputs to arithmetic processing section 3 as the digital signal matrix D, and the output of arithmetic processing section 3A is exported as voltage detection signal V1 in addition.
A/D conversion process portion 2 is converted to digital signal according to certain cycle with the instantaneous value of alternating voltage V0, output digital signal matrix D.
Fig. 3 is the frequency characteristic figure of the voltage check device 1A of expression the present invention the 1st embodiment effect.
In the figure, it is the center that frequency detecting signal F is in reference frequency F0, frequency field from minimum switching frequency F1 to maximum switching frequency F2, the switching signal Q of amplitude operation result B is selected in 7 outputs of function generating mechanism, and switching mechanism 8 is exported the value of amplitude operation result B as voltage detection signal V1.
Frequency detecting signal F is in less than minimum frequency F1 or greater than the frequency of maximum switching frequency F2, function generating mechanism 7 according to select integral operation as a result the mode of S export switching signal Q, switching mechanism 8 with integral operation as a result the value of S export as voltage detection signal V1.
According to said structure, the exportable amplitude operation result of the frequency field B that the precision in amplitude arithmetical organ 5 is higher, the lower frequency field integral operation of precision as a result S can be used as voltage detection signal V1 output.Therefore, even under the situation that the frequency relative datum frequency F0 of alternating voltage V0 changes, still can carry out the precision higher voltage and detect by switch operation mechanism.
If adopt the 1st embodiment according to top describing mode, can obtain the excitation control device of following synchronous motor, even promptly the number of revolutions at synchronous motor changes, under the situation that the frequency relative datum frequency F0 of the electric weight of its output changes, because precision that can be higher obtains voltage detection signal, the output of automatic voltage adjustment arithmetical organ also is correct like this, thereby this device still can carry out the higher control of precision.
In addition, the present invention also can as shown in Figure 4, in function generating mechanism 7, make switching signal Q keep hysteresis characteristic according to the frequency detecting signal F that calculates by frequency detecting mechanism 4 by the structure identical with the 1st embodiment.
That is, to preestablish with reference frequency F0 be minimum switching frequency F3 and F4, maximum switching frequency F5 and the F6 at center to frequency detecting signal F.Here, minimum switching frequency F3 is for to switch to the integral operation frequency of S as a result from amplitude operation result B, minimum switching frequency F4 for from integral operation as a result S switch to the frequency of amplitude operation result B.In addition, maximum switching frequency F5 for from integral operation as a result S switch to the frequency of amplitude operation result B, maximum switching frequency F6 is for to switch to the integral operation frequency of S as a result from amplitude operation result B.
Because between minimum switching frequency F3 and the F4 and keep hysteresis characteristic between maximum switching frequency F5 and the F6, above-mentioned like this scope can not make the switching signal Q of function generating mechanism 7 change with the change of interior frequency detecting signal F.
According to said structure, except the effect of the present invention the 1st embodiment, also can obtain following effect, even this effect refers under near frequency detecting signal F is positioned at switching frequency the situation, when it is positioned at the scope of hysteresis characteristic, because switching signal Q do not change, amplitude operation result B and integral operation are not switched between the S as a result, and the appearance repeatedly of the change of V1 is exported in the computing that causes because of the difference of arithmetical organ of may command like this.
Fig. 5 is the structure chart of the 2nd embodiment of voltage check device of the present invention.
In Fig. 5, the embodiment of relative Fig. 2, the efferent of voltage check device 1B is different.For identical structure, adopt identical label, omit its explanation here, and only difference is described.
Arithmetic processing section 3B is made of function generating mechanism 7 and arithmetical organ 13, this function generating mechanism 7 is according to frequency detecting signal F, output is respectively with respect to amplitude operation result B and the integral operation weighted signal R of S as a result, above-mentioned arithmetical organ 13 is according to each weighted signal R, with weighted signal R and amplitude computing signal B and integral operation as a result S carry out multiplying, these values are carried out add operation, voltage sense signal V1.
Fig. 6 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 2nd embodiment.
In the figure, be the center according to the frequency detecting signal with reference frequency F0, preestablish minimum weight frequency F7 and F8, maximum weighted frequency F9 and F10.Here, in the scope of minimum weight frequency F7 to F8, when frequency detecting signal F increases, according to the weight that makes amplitude operation result B increase, integral operation as a result the mode that reduces of the weight of S weighted signal R is changed.
In addition, when in scope from maximum weighted frequency F9 to F10, when frequency detecting signal F increases, according to the weight of amplitude operation result B reduce, integral operation as a result the mode that increases of the weight of S weighted signal R is changed.
According to said structure,, after amplitude operation result B and the integral operation add operation that S is weighted as a result, can obtain voltage detection signal V1 in frequency according to alternating voltage V0.Thus, even under the situation of the frequency shift of alternating voltage V0, still can obtain the higher operation result of precision.In addition, owing to compute weighted, can not make output discontinuous variation occur so substantially because of the difference of arithmetical organ.
Fig. 7 is the structure chart of the 3rd embodiment of voltage check device of the present invention.Present embodiment relatively with the embodiment of Fig. 2 in the integral operation mode adopt the situation of preparation arithmetical organ, its difference is to adopt the standardization arithmetical organ as preparing arithmetical organ.
In Fig. 7, voltage check device 1C comprises: A/D conversion process portion 2, and this A/D conversion process portion 2 is converted to digital signal according to some cycles with alternating voltage V0, output digital signal matrix D; Rectification handling part 9, this rectification handling part 9 is converted to direct voltage V2 with alternating voltage V0; Filter 10, this filter 10 make this direct voltage V2 keep level and smooth; A/D conversion process portion 11, this A/D conversion process portion 11 according to some cycles will through smoothing processing direct voltage V3 be converted to digital signal, output digital signal matrix D 1; Arithmetic processing section 3C.
In addition, this arithmetic processing section 3C comprises: frequency detecting mechanism 4, the digital signal matrix D that this frequency detecting mechanism 4 calculates according to the instantaneous value by alternating voltage V0, the frequency detecting signal F of the proportional relation of frequency of output and alternating voltage V0; Amplitude arithmetical organ 5 (basic operation mechanism), the amplitude operation result B of these amplitude arithmetical organ 5 output digital signal matrix D; Standardization arithmetical organ 12 (preparation arithmetical organ), this standardization arithmetical organ 12 make according to the digital signal matrix D 1 that calculates through the direct voltage of smoothing processing and become signal with effective value or the proportional relation of mean value.
In addition, output mechanism is made of function generating mechanism 7 and switching mechanism 8, above-mentioned function generating mechanism 7 is according to the frequency detecting signal F output switching signal Q relative with standardization operation result G with amplitude operation result B, this switching mechanism 8 switches amplitude operation result B and standardization operation result G according to switching signal Q.
Fig. 8 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 3rd embodiment.
As shown in the figure, according to frequency detecting signal F, with reference frequency F0 be the center, from minimum switching frequency F11 to the frequency of maximum switching frequency F12, the switching signal Q of amplitude operation result B is selected in 7 outputs of function generating mechanism, and switching mechanism 8 is exported the value of amplitude operation result B as voltage detection signal V1.
Frequency detecting signal F is in the frequency that minimum switching frequency F11 is following or peak frequency F12 is above, the switching signal Q of function generating mechanism 7 output choice criteria operation result G, switching mechanism 8 is exported the value of standardization operation result G as voltage detection signal V1.
According to said structure, in the higher frequency field of the precision of amplitude arithmetical organ 5, select amplitude operation result B, choice criteria operation result G in the lower frequency field of operational precision, thus The above results can be exported as voltage detection signal V1.Therefore, even under the situation that alternating voltage V0 changes, still can carry out the voltage detecting of degree of precision by the mode of switch operation mechanism.
In addition, the present invention can as shown in Figure 9, in function generating mechanism 7, make switching signal Q keep hysteresis characteristic according to the frequency detecting signal F that calculates by frequency detecting mechanism 4 according to the structure identical with the 3rd embodiment.
That is, minimum switching frequency F13 is for switching to the frequency of standardization operation result G from amplitude operation result B, and minimum switching frequency F14 is for switching to the frequency of amplitude operation result B from standardization operation result G.
In addition, maximum switching frequency F15 is for switching to the frequency of amplitude operation result B from standardization operation result G, and maximum switching frequency F16 is for switching to the frequency of standardization operation result G from amplitude operation result B.
Owing to keeping hysteresis characteristic between minimum switching frequency F13 and the F14 and between maximum switching frequency F15 and F16, above-mentioned like this scope can not make the switching signal Q of function generating mechanism 7 change with the variation of interior frequency detecting signal F, can prevent because of the surplus that causes near the frequency change of boundary switching, suppress the appearance repeatedly of the variation of computing output V1.
Figure 10 is the structure chart of the 4th embodiment of voltage check device of the present invention.
In Figure 10, the embodiment of relative Fig. 7, the efferent of voltage check device 1D is different.Identical structure adopts identical label, and its description of Therefore, omited here is described difference.
Arithmetic processing section 3D is made of function generating mechanism 7 and arithmetical organ 13, this function generating mechanism 7 is according to frequency detecting signal F, the output weighted signal R relative with standardization operation result G with amplitude operation result B, above-mentioned arithmetical organ 13 carries out multiplying according to weighted signal R with weighted signal R and amplitude operation result B and standardization operation result G, these values are carried out add operation, voltage sense signal V1.
According to said structure, can obtain the frequency according to alternating voltage V0, the output that amplitude operation result B and standardization arithmetical organ G are computed weighted.Thus, when when in the less arithmetical organ of error, forming the mode generation function of more weight in advance, even under the situation of the frequency shift of alternating voltage V0, the operation result that still can obtain to have degree of precision.
In addition,, can not cause the discontinuous variation of output, can obtain stable operation result like this because of the difference of arithmetical organ owing to compute weighted.
Figure 11 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 4th embodiment.
In the figure, preestablishing with reference frequency F0 is minimum weight frequency F17 and F18, maximum weighted frequency F19 and the F20 at center.Here, when when frequency in the scope of minimum weight frequency F17 to F18 increases, according to the mode that the weight of amplitude operation result B increases, the weight of standardization operation result G reduces, weighted signal signal R changes.
In addition, in the scope of minimum weight frequency F19 to F20, when frequency increased, according to the mode that the weight of amplitude operation result B reduces, the weight of standardization operation result G increases, weighted signal R changed.
Thus, owing to can not cause the discontinuous variation of output because of the difference of arithmetical organ, thus can obtain stable operation result.
Figure 12 is the structure chart of the present invention the 5th embodiment.The difference of the embodiment of present embodiment and Fig. 2, Fig. 5, Fig. 7, Figure 10 is: adopt the output mechanism with high value preferential shop.
In Figure 12, voltage check device 1E comprises: A/D conversion process portion 2, and this A/D conversion process portion is converted to digital signal and exports the digital signal matrix D according to the instantaneous value of some cycles with alternating voltage V0; Rectification handling part 9, this rectification handling part 9 is converted to direct voltage V2 with alternating voltage V0; Filter 10, this filter 10 make this direct voltage V2 keep level and smooth; Arithmetic processing section 3E.
Arithmetic processing section 3E comprises: amplitude arithmetical organ 5, the amplitude operation result B of these amplitude arithmetical organ 5 output digital signal matrix D; Standardization arithmetical organ 12, this standardization arithmetical organ 12 will according to digital signal matrix D 1 calculation process that calculate through the direct voltage V3 of smoothing processing for the signal and the outputting standard operation result G of effective value or the proportional relation of mean value; High value preferential shop 14, this high value preferential shop 14 pairs of amplitude operation results B and standardization operation result G compare, and select the greater and export.
According to said structure, can obtain the higher value in the operation result of amplitude operation result B and standardization operation result G as computing output.Because amplitude arithmetical organ 5 has the highest precision near the reference frequency F0 that is obtained by formula (2), along with the relative datum frequency change, precision reduces, output reduces, high like this value preferential shop 14 is selected the amplitude operation result at the frequency field that can carry out the full accuracy computing, and the scope beyond it can be selected the standardization operation result.
In addition, by high value preferential shop 14, also can obtain to make effect, the effect of the discontinuous variation minimizing that causes because of the difference of arithmetical organ at the switching point place.
Figure 13 is the structure chart of the effect of the 6th embodiment of expression voltage check device of the present invention.
The relative structure of Figure 12, the difference of voltage check device 1F shown in Figure 13 be according to detected frequency, and the output of each arithmetical organ is computed weighted.
Figure 14 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 6th embodiment.
As shown in the figure, preestablishing with reference frequency F0 is minimum weight frequency F21～24 and maximum weighted frequency F25～28 at center.Here, F22 is in the frequency field of the weight increase that makes amplitude operation result B when minimum weight frequency F21 increases frequency, and F24 is in the frequency field of the weight minimizing that makes the standardization operation result when minimum weight frequency F23 increases frequency.
In addition, F26 is in the frequency field of the weight increase that makes the standardization operation result when maximum weighted frequency F25 increases frequency, and F28 is in the frequency field of the weight minimizing that makes amplitude operation result B when maximum weighted frequency F27 increases frequency.
According to said structure, from minimum weight frequency F21 to the frequency field of maximum weighted frequency F28, can obtain the higher value among the ranking operation result of amplitude operation result B and standardization operation result G as computing output.
In addition, because amplitude arithmetical organ 5 is in the highest precision near the reference frequency F0 shown in the formula (2), along with frequency shift, precision reduce, then output reduces, high like this value preferential shop 14 is selected the amplitude operation result at the frequency field that can carry out the full accuracy computing by amplitude arithmetical organ 15, the regional choice criteria operation result beyond it.
In addition, by high value preferential shop 14, reduce in the variation of the discontinuous output that causes because of the arithmetical organ difference at switching point place.
Also have, in the structure of Figure 12 and Figure 13, adopt the embodiment of amplitude arithmetical organ 15 to be illustrated to basic operation mechanism, adopt the embodiment of standardization arithmetical organ 12 to be illustrated to the preparation arithmetical organ, but as shown in Figure 2, the preparation arithmetical organ also can adopt integral operation mechanism 6.In addition, the preparation arithmetical organ also can be the structure that adopts integral operation mechanism 6 and standardization arithmetical organ 12 simultaneously.
Figure 15 is the structure chart of the 7th embodiment of voltage check device of the present invention.
Voltage check device 1G shown in Figure 15 is with structure shown in Figure 2 and textural association shown in Figure 7.That is, adopt amplitude arithmetical organ 5, adopt standardization arithmetical organ 12, adopt switching mechanism, have higher precision like this as output mechanism as the preparation arithmetical organ as basic operation mechanism.
Arithmetic processing section 3G comprises: frequency detecting mechanism 4, and this frequency detecting mechanism 4 is according to the frequency detecting signal F of the proportional relation of frequency of the digital signal matrix D, output and the alternating voltage V0 that are calculated by the alternating voltage instantaneous value; Amplitude arithmetical organ 5, the amplitude operation result B of these amplitude arithmetical organ 5 output digital signal matrix D; Integral operation mechanism 6, this integral operation mechanism 6 number of times according to the rules carry out add operation to the absolute value of digital signal matrix D, and the output integral operation is S as a result; Standardization arithmetical organ 12, this standardization arithmetical organ 12 make according to the digital signal matrix D 1 that calculates through the direct voltage V3 of smoothing processing becomes signal with effective value or the proportional relation of mean value; Function generating mechanism 7, this function generating mechanism 7 is according to the frequency detecting signal, switch amplitudes operation result B and the integral operation signal output of S and standardization operation result G as a result; Switching mechanism 8, this switching mechanism 8 are according to switching signal, and switch amplitudes operation result B and integral operation be S and standardization operation result G as a result.
Figure 16 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 7th embodiment.
In this frequency characteristic figure, from being that the minimum switching frequency F29 at center is to the frequency of maximum switching frequency F30 with reference frequency F0, function generating mechanism 7 is according to the switching signal of frequency detecting signal F output selection amplitude operation result B, and switching mechanism 8 is exported the value of amplitude operation result B as voltage detection signal V1.
In addition, frequency detecting signal F is in the frequency less than minimum frequency F29, and the integral operation switching signal Q of S is as a result selected in 7 outputs of function generating mechanism, and switching mechanism 8 is exported integral operation result's value as voltage detection signal V1.
Frequency detecting signal F is in the frequency greater than peak frequency F30 in addition, the switching signal of function generating mechanism 7 output choice criteria operation result G, and switching mechanism 8 is exported the value of standardization operation result G as voltage detection signal V1.
According to said structure, near the higher reference frequency F0 of the precision of amplitude computing structure B, amplitude operation result B exports as voltage detection signal V1, minimum frequency F29 from the precision reduction, in the lower zone of frequency, the integral operation that precision is higher S is as a result exported as voltage detection signal V2.In addition, the peak frequency F30 from the precision that makes amplitude operation result B reduces in the higher zone of frequency, exports standardization operation result G as voltage detection signal V1.
If adopt the 7th embodiment, can switch in amplitude operation result, integral operation result, the standardization operation result according to the frequency of alternating voltage V0, thereby obtain computing output according to top describing mode.Thus, if produce function,, still can obtain the higher operation result of precision even then under the situation of the frequency shift of alternating voltage V0 according to the mode of the less arithmetical organ of Select Error in advance.
In addition, the present invention can as shown in figure 17, in function generating mechanism 7, make switching signal Q keep hysteresis characteristic according to the frequency detecting signal F that is calculated by frequency detecting mechanism 4 by the structure identical with the 7th embodiment.
That is, preestablishing with reference frequency F0 is minimum switching frequency F31 and F32, maximum switching frequency F33 and the F34 at center.Here, minimum switching frequency F31 is for to switch to the integral operation frequency of S as a result from amplitude operation result B, minimum switching frequency F32 for from integral operation as a result S switch to the frequency of amplitude operation result S.
In addition, maximum switching frequency F33 is for switching to the frequency of amplitude operation result B from standardization operation result G, and maximum switching frequency F34 is for switching to the frequency of standardization operation result G from amplitude operation result B., keeping hysteresis characteristic between minimum switching frequency F31 and the F32 and between maximum switching frequency F33 and F34 here, the variation of the frequency detecting signal F in this scope can not make the switching signal Q of function generating mechanism 7 change substantially.
According to said structure, except the effect of the present invention the 7th embodiment, even because under near the situation frequency detecting signal F is positioned at switching frequency, when being in the scope of hysteresis characteristic, switching signal Q can not change, do not switch like this, thereby still can suppress the appearance repeatedly of the variation of the computing output V1 that the difference because of arithmetical organ causes.
Figure 18 is the structure chart of the 8th embodiment of voltage check device of the present invention.
In Figure 18, the testing agency of the structure of the relative Figure 15 of voltage check device 1H, its difference is to adopt weighting, add operation mechanism to replace switching mechanism.
Figure 19 is the frequency characteristic figure of the voltage check device of the effect of expression the present invention the 8th embodiment.
It is minimum weight frequency F35 and F36, maximum weighted frequency F37 and the F38 at center that this frequency characteristic figure preestablishes with reference frequency F0.Here, F36 for when minimum weight frequency F35 increases frequency, the weight of amplitude operation result B is increased, the integral operation frequency field that reduces of the weight of S as a result.
In addition, F38 is the frequency field that when maximum weighted frequency F37 increases frequency the weight of amplitude operation result B is reduced, the weight of standardization operation result G increases.
According to said structure, near the higher reference frequency F0 of the precision of amplitude operation result B, B exports as voltage detection signal V1 with amplitude computing structure, the minimum frequency F35 that reduces from precision, in the lower zone of frequency integral operation that precision is higher as a result S export as voltage detection signal V1.In addition, the peak frequency F38 from the precision that makes amplitude operation result B reduces in the higher zone of frequency, exports standardization operation result G as voltage detection signal V1.
In addition, between the minimum frequency F35 to F36 and the frequency field between peak frequency F37 and the F38, by each operation result being weighted voltage sense signal V1.In addition, in the structure of Figure 18, the add operation mechanism in the output mechanism also can be according to the frame mode of Figure 13 as high value preferential shop.
In the superincumbent description, compute mode is an example with amplitude compute mode, integral operation mode, standardization compute mode, thereby obtain corresponding formula (1), (4), (5), but also can adopt the alternate manner (such as the mode that adopts the frequency error revisal) of identical operation mode.Detection electric weight as exchanging except voltage, electric current, also can detect active power, inefficient power.In addition, the alternate manner that also can carry out computing with effective value or the mean value to ac electric makes up.
As mentioned above, if the voltage check device of the embodiment with the 1st～the 8th is as the alternating current signal detection device among Fig. 1, then can obtain the excitation control device of following synchronous motor, even this device still can obtain correct electric weight under the situation that frequency changes, and can higher precision control.
If adopt the present invention according to top describing mode, owing to adopt the different multiple compute mode of frequency characteristic ac signal (voltage etc.) is carried out computing, the operation result that will have degree of precision according to frequency characteristic is exported as the electric weight detection signal, can obtain the following ac signal checkout gear and the excitation control device of synchronous motor like this, even this device is under the situation that the frequency of electric weight to be detected changes, still can calculate correct electric weight detection signal, and can calculate correct controlled quentity controlled variable forcibly.
In addition, because by carrying out the amplitude compute mode of computing as the basic operation mode with amplitude to ac electric, with integral operation mode or standardization compute mode as the preparation compute mode, near the special output of adopting the higher amplitude compute mode of precision fundamental frequency, adopt the output of integral operation mode or standardization compute mode at the frequency field that departs from fundamental frequency, higher in the frequency band range precision of broad like this, can carry out correct electric weight and detect.
In addition, if a plurality of preparation compute modes are set,, then can expect to obtain bigger effect according to the highest zone of frequency characteristic employing of each compute mode.
Also have, because as output mechanism, according to the frequency detecting signal voltage detection signal of weighted signal and each compute mode is carried out multiplying, in addition each signal that is obtained is carried out add operation and forms voltage detection signal, the output that so can switch operation mechanism provide, thus can avoid producing discontinuous variation because of the difference of the output valve of arithmetical organ.
In addition, because output mechanism adopts high value preferential shop, can avoid like this producing discontinuous variation because of the difference of the output valve of arithmetical organ.In addition, also need not according to circumstances to adopt frequency detecting mechanism.Also have, according to the present invention,, can prevent near the switching repeatedly switching point like this owing in the switching of output mechanism, keep magnetic hysteresis, can not make output change exportable stable, correct voltage detection signal because of the difference of the voltage detection signal of each arithmetical organ.
Claims (14)
1. excitation control device, this excitation control device is controlled the output voltage of the synchronous motor that is connected with AC electric power systems to the exciting bank adjustment of the exciting circuit of excitation synchronous motor, it is characterized in that this device comprises:
A/D conversion process mechanism, this A/D conversion process mechanism imports the output voltage of above-mentioned synchronous motor, and the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, the digital signal that these a plurality of arithmetical organs adopt above-mentioned A/D conversion process mechanism to be exported, according to the different a plurality of compute modes of frequency characteristic, the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value carried out computing;
Frequency detecting mechanism, the frequency of the output AC electric weight of above-mentioned synchronous motor detects in this frequency detecting mechanism;
Output mechanism, this output mechanism be according to the detected frequency of said frequencies testing agency, and any one output in above-mentioned a plurality of arithmetical organs is exported as the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The automatic voltage adjusting mechanism, the electric weight detection signal that this automatic voltage adjusting mechanism is exported according to above-mentioned output mechanism encourages the control computing, and the output of the excitation control signal that is sent to above-mentioned exciting bank is adjusted.
2. the excitation control device of synchronous motor according to claim 1 is characterized in that, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation or ac electric is carried out at least a compute mode in the standardization compute mode of standardization computing, the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value carried out computing.
3. the excitation control device of synchronous motor according to claim 2, it is characterized in that, above-mentioned output mechanism is following output mechanism, when it is arranged in the prescribed limit of fundamental frequency of the ac electric that comprises above-mentioned electric power system in the detected frequency of said frequencies testing agency, export the electric weight detection signal that above-mentioned basic operation mechanism is sent, when the detected frequency of said frequencies testing agency is positioned at beyond the afore mentioned rules scope, export the electric weight detection signal that above-mentioned preparation arithmetical organ sends.
4. excitation control device, this excitation control device is controlled the output voltage of the synchronous motor that is connected with AC electric power systems to the exciting bank adjustment of the exciting circuit of excitation synchronous motor, it is characterized in that it comprises:
A/D conversion process mechanism, this A/D conversion process mechanism imports the output voltage of above-mentioned synchronous motor, and the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
Basic operation mechanism, the digital signal that this basic operation mechanism adopts above-mentioned A/D conversion process mechanism to be exported, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal of being exported by above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation or ac electric is carried out any in the standardization compute mode of standardization computing, the electric weight detection signal suitable with the effective value of the output voltage of above-mentioned synchronous motor or mean value carried out computing;
Output mechanism, this output mechanism comprise high value preferential shop, and this high value preferential shop is selected above-mentioned basic operation mechanism and prepared the signal of the high value in each electric weight detection signal that arithmetical organ exports, and with its output;
The automatic voltage adjusting mechanism, the electric weight detection signal that this automatic voltage adjusting mechanism is exported according to above-mentioned output mechanism encourages the control computing, and the output of the excitation control signal that is sent to above-mentioned exciting bank is adjusted.
5. an ac signal checkout gear is characterized in that, this device comprises:
A/D conversion process mechanism, this A/D conversion process mechanism input AC electric weight, the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, these a plurality of arithmetical organs adopt the digital signal by the output of above-mentioned A/D conversion process mechanism, carry out computing according to the effective value or the suitable electric weight detection signal of mean value of a plurality of different compute modes pair and above-mentioned ac electric;
Frequency detecting mechanism, the frequency of above-mentioned ac electric detects in this frequency detecting mechanism;
Output mechanism, this output mechanism be according to the detected frequency of said frequencies testing agency, and any one output in above-mentioned a plurality of arithmetical organs is exported as the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value.
6. ac signal checkout gear according to claim 5 is characterized in that, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing;
7. ac signal checkout gear according to claim 5 is characterized in that, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the standardization compute mode of ac electric being carried out the standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
8. ac signal checkout gear according to claim 7, it is characterized in that, above-mentioned preparation arithmetical organ is following arithmetical organ, this arithmetical organ adopts and will carry out that rectification is handled and the direct current measurement that obtains is converted to the 2nd digital signal that A/D conversion process mechanism is exported of digital signal to above-mentioned input electric weight, and above-mentioned electric weight detection signal is carried out computing.
9. ac signal checkout gear according to claim 5 is characterized in that, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The 1st preparation arithmetical organ, the 1st preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing;
The 2nd preparation arithmetical organ, the 2nd preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the standardization compute mode of ac electric being carried out the standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
10. according to claim 6,7 or 9 described ac signal checkout gears, it is characterized in that, above-mentioned output mechanism is following output mechanism, this output mechanism is exported the electric weight detection signal that above-mentioned basic operation mechanism sends when the detected frequency of said frequencies testing agency is positioned at the prescribed limit of fundamental frequency of the regulation that comprises above-mentioned ac electric, export the electric weight detection signal that above-mentioned preparation arithmetical organ sends when the detected frequency of said frequencies testing agency is positioned at beyond the afore mentioned rules scope.
11. according to claim 6,7,9 or 10 described ac signal checkout gears, it is characterized in that, above-mentioned output mechanism comprises following switching selection mechanism, this switching selection mechanism is selected to switch or switch each electric weight detection signal that above-mentioned a plurality of arithmetical organ is exported in the mode of computing weighted, and with its output.
12. ac signal checkout gear according to claim 11 is characterized in that, the switching selection mechanism of above-mentioned output mechanism is for being provided with the switching selection mechanism of regulation magnetic hysteresis width in handoff boundary.
13. an ac signal checkout gear is characterized in that, this device comprises:
A/D conversion process mechanism, this A/D conversion process mechanism input AC electric weight, the instantaneous value that will import electric weight is converted to digital signal the cycle according to the rules;
A plurality of arithmetical organs, these a plurality of arithmetical organs adopt the digital signal by the output of above-mentioned A/D conversion process mechanism, according to a plurality of different compute modes, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value are carried out computing;
Output mechanism, this output mechanism comprises high value selection mechanism, the high-value signal in each electric weight detection signal that above-mentioned a plurality of arithmetical organ exports is selected in this high value selection mechanism, with its as with the effective value or the suitable electric weight detection signal output of mean value of above-mentioned ac electric.
14. ac signal checkout gear according to claim 13 is characterized in that, above-mentioned a plurality of arithmetical organs comprise:
Basic operation mechanism, this basic operation mechanism adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, the amplitude compute mode of carrying out computing according to the amplitude to ac electric is carried out computing to the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value;
The preparation arithmetical organ, this preparation arithmetical organ adopts the digital signal by the output of above-mentioned A/D conversion process mechanism, according to the integral operation mode of ac electric being carried out integral operation or ac electric is carried out at least a compute mode in the standardization compute mode of standardization computing, the electric weight detection signal suitable with the effective value of above-mentioned ac electric or mean value carried out computing.
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