CN103323617B - Static electronic speed testing device and method for generator - Google Patents
Static electronic speed testing device and method for generator Download PDFInfo
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- CN103323617B CN103323617B CN201310228903.0A CN201310228903A CN103323617B CN 103323617 B CN103323617 B CN 103323617B CN 201310228903 A CN201310228903 A CN 201310228903A CN 103323617 B CN103323617 B CN 103323617B
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Abstract
The invention discloses a static electronic speed testing device and method for a generator. The static electronic speed testing device comprises a phase voltage sampling module, an operational amplifier isolation module, three-phase voltage intersection point sampling module, a shaping and filtering module, a digital signal processor and a power module, wherein the phase voltage sampling module comprises three sampling circuits connected with three-phase voltage output ends of a secondary winding of the generator respectively; the operational amplifier isolation module comprises three operational amplifier circuits connected with output ends of the sampling circuits respectively; the three-phase voltage intersection point sampling module comprises six sampling circuits used for obtaining voltage signals of six intersection points, within a circle, of three-phase voltages; the shaping and filtering module is used for shaping and filtering analog levels where the intersection points are sampled; the digital signal processor is used for outputting rotating speed according to signals transmitted by the shaping and filtering module. The static electronic speed testing device does not need installing on the output shaft of the generator, and the rotating speed of the generator can be tested just through the three-phase output voltage signals. Influence of the environment on the static electronic speed testing device is small, and the static electronic speed testing device is easy to install and maintain and low in cost and fault rate.
Description
Technical field
The present invention relates to a kind of speed measuring device, in particular for the state type electronic speed-determination device of generator.
Background technology
In electricity generation system, it is very important for detecting the rotating speed of generator, and many control methods are all the enterprising row operations in basis in the actual speed measuring generator.Such as, the maximal power tracing of our generator controls all to need generator speed accurately to participate in controlling.Existing generator speed measuring device many employings pumped FIR laser sensor or Hall element test the speed, and utilize the physical construction of rotary kinetic measurement, and installation difficulty is large, and failure rate is high, and Long Service Life can subtract greatly, brings great inconvenience to the maintenance of user.For pumped FIR laser sensor; it is the sensor by opto-electronic conversion, the geometry of machinery displacement on magneto output shaft being converted to pulse or digital quantity; it is in the course of the work easily by the impact of environment (illumination, dust); precision is low; the rotary speed unstabilization measured is fixed; cause that power is given disturbance, even lose generator speed signal and shut down.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide the state type electronic speed-determination device for generator and speed-measuring method thereof.
The technical solution used in the present invention is: for the state type electronic speed-determination device of generator, comprising:
Phase voltage sampling module, comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively;
Amplifier isolation module, comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module and isolation;
Three-phase voltage intersection point sampling module, comprises six sample circuits, and described sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period;
Shaping filter module, for taking out the analog level shaping after intersection point, filtering;
Digital signal processor, for the signal output speed according to shaping filter module transfer;
Power module, for providing voltage to input for amplifier isolation module, three-phase voltage intersection point sampling module, shaping filter module, digital signal processor.
The input signal of described sample circuit is any two phase signals in the three-phase voltage of amplifier isolation module output, for the comparison by operational amplifier to control to export, exports high level signal when namely described any two-phase signal level is equal.
Be in series with level switch module between described three-phase voltage intersection point sampling module and shaping filter module, for being changed by the incoming level of three-phase voltage intersection point sampling module, described three-phase voltage intersection point sampling module is powered by power module.
Be in series with light-coupled isolation module between described level switch module and shaping filter module, described light-coupled isolation module is powered by power module.
Described digital signal processor comprises A/D analog to digital converter, dsp processor, host computer, described A/D analog to digital converter is used for the analog output signal of shaping filter module to be converted into digital signal, the digital signal that described dsp processor transforms according to A/D analog to digital converter tests out rotating speed, and described host computer is for showing rotating speed.
For a speed-measuring method for the state type electronic speed-determination device of generator, the described state type electronic speed-determination device for generator comprises: phase voltage sampling module, comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively; Amplifier isolation module, comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module and isolation; Three-phase voltage intersection point sampling module, comprises six sample circuits, and described sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period; Shaping filter module, for taking out the analog level shaping after intersection point, filtering; Digital signal processor, for the signal output speed according to shaping filter module transfer; Power module, for providing voltage to input for amplifier isolation module, three-phase voltage intersection point sampling module, shaping filter module, digital signal processor; It is characterized in that: comprise the following steps: A) gather the three-phase output voltage signal of generator by phase voltage sampling module; B) amplifier isolation module is to the three-phase voltage signal amplifier isolation collected; C) voltage signal of six intersection points of three-phase voltage in one-period is obtained by three-phase voltage intersection point sampling module; D) shaping filter module is to the analog level shaping of taking out after intersection point, filtering; E) digital signal processor is according to the signal output speed after shaping filter.
Described step C changes at the laggard line level of the voltage signal obtaining six intersection points of three-phase voltage in one-period to adjust amplitude.
Described step C adopts light-coupled isolation to promote transmission speed after level conversion.
Described step D comprises: D1) input pulse; D2) regulating impulse; D3) reverse shaped pulse; D4) pulse bandwidth filtering; D5) direct current is exported.
Described step e comprises: E1) input direct-current; E2) analog to digital conversion is carried out to the simulating signal of input; E3) output speed is carried out according to the digital signal input speed function after conversion; E4) rotating speed is shown.
Beneficial effect of the present invention:
The present invention is used for state type electronic speed-determination device and the speed-measuring method thereof of generator, without the need to being arranged on the output shaft of generator, the three-phase output voltage signal only need measuring generator just can measure the rotating speed of generator, it is a kind of static electronic method of testing, impact by environment is less, I&M is easy, and cost is low, failure rate is low.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Fig. 1 is functional block diagram of the present invention;
Fig. 2 is digital signal processor module block diagram of the present invention;
Fig. 3 is the circuit diagram of phase voltage sampling module;
Fig. 4 is the circuit diagram of amplifier isolation module;
Fig. 5 is the circuit diagram of three-phase voltage intersection point sampling module;
Fig. 6 is the circuit diagram of level switch module;
Fig. 7 is the circuit diagram of light-coupled isolation module;
Fig. 8 is the circuit diagram of shaping filter module;
Fig. 9 is the process flow diagram of shaping filter module;
Figure 10 is the process flow diagram of digital signal processor module;
Figure 11 is the circuit diagram of power module.
Embodiment
The rotor that the present invention is used for generator tests the speed, and the rotating speed of generator is calculated in the change based on its three-phase output voltage signal, and the cardinal principle of foundation is as follows:
1.y1＝sin(ωx)；
2.y1＝sin(ωx+2*π/3)；
3.y1＝sin(ωx+4*π/3)；
Three formula are the functional expressions of three-phase voltage above, and get 0 ~ 2* π with the scope of x, it is example that ω gets 100* π, obtain intersection point between two, i.e. the intersection point of 1 and 2, the intersection point of 1: 3, the intersection point of 2 and 3 to three formula above.
Result is π/6,3* π/6,5* π/6,7* π/6,9* π/6,11* π/6.When the frequencies omega of three-phase voltage changes, intersection point also changes according to a certain percentage, frequencies omega and rotating speed n one-to-one relationship, its relational expression:
namely
wherein, p is the number of pole-pairs of synchronous generator.
Otherwise when intersection point (frequencies omega) changes, namely the rotating speed n of generator also changes thereupon.
Shown in Fig. 1-Figure 11, for the state type electronic speed-determination device of generator, comprising:
Phase voltage sampling module 1, comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively;
Amplifier isolation module 2, comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module 1 and isolation;
Three-phase voltage intersection point sampling module 3, comprises six sample circuits, and described sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period; Wherein, the input signal of sample circuit is any two phase signals in the three-phase voltage of amplifier isolation module 2 output, to combine with integrating circuit for the comparison by operational amplifier and output signal is controlled, when namely described any two-phase signal level is equal, export high level pulse signal;
Shaping filter module 4, for taking out the analog level shaping after intersection point, filtering;
Digital signal processor 5, for the signal output speed transmitted according to shaping filter module 4;
Power module 6, for providing voltage to input for amplifier isolation module 2, three-phase voltage intersection point sampling module 3, shaping filter module 4, digital signal processor 5.
For adjustment output amplitude, level switch module 7 is in series with between three-phase voltage intersection point sampling module 3 and shaping filter module 4, for the incoming level of three-phase voltage intersection point sampling module 3 is converted to 24V by 15V, three-phase voltage intersection point sampling module 3 is powered by power module 6.
In addition, be in series with light-coupled isolation module 8 between level switch module 7 and shaping filter module 4, to improve transmission speed, light-coupled isolation module 8 is powered by power module 6.
As shown in Figure 8, shaping filter module 4 is provided with turnable pulse width resistance to regulate input pulse.
As shown in Figure 2, digital signal processor 5 comprises A/D analog to digital converter 51, dsp processor 52, host computer 53, A/D analog to digital converter 51 is for being converted into digital signal by the analog output signal of shaping filter module 4, the digital signal that dsp processor 52 transforms according to A/D analog to digital converter 51 tests out rotating speed, and host computer 53 is for showing rotating speed.
For a speed-measuring method for the state type electronic speed-determination device of generator, the described state type electronic speed-determination device for generator comprises: phase voltage sampling module 1, comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively; Amplifier isolation module 2, comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module 1 and isolation; Three-phase voltage intersection point sampling module 3, comprises six sample circuits, and sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period; Shaping filter module 4, for taking out the analog level shaping after intersection point, filtering; Digital signal processor 5, for the signal output speed transmitted according to shaping filter module 4; Power module 6, for providing voltage to input for amplifier isolation module 2, three-phase voltage intersection point sampling module 3, shaping filter module 4, digital signal processor 5; Comprise the following steps: A) the three-phase output voltage signal of generator is gathered by phase voltage sampling module 1; B) amplifier isolation module 2 is to the three-phase voltage signal amplifier isolation collected; C) voltage signal of six intersection points of three-phase voltage in one-period is obtained by three-phase voltage intersection point sampling module 3; D) shaping filter module 4 is to the analog level shaping of taking out after intersection point, filtering; E) digital signal processor 5 is according to the signal output speed after shaping filter.
As the further optimization of the technical program, step C changes at the laggard line level of the voltage signal obtaining six intersection points of three-phase voltage in one-period to adjust amplitude.
As the further optimization of the technical program, step C adopts light-coupled isolation to promote transmission speed after level conversion.
As shown in Figure 9, step D comprises: D1) input pulse; D2) regulating impulse; D3) reverse shaped pulse; D4) pulse bandwidth filtering; D5) direct current 0 ~ 10v is exported.
As shown in Figure 10, step e comprises: E1) input 0-10v direct current signal; E2) analog to digital conversion digital signal (sexadecimal 0000 ~ 7FFF) is carried out to the simulating signal of input; E3) output speed is carried out according to the digital signal input speed function after conversion; E4) rotating speed is shown.
Wherein, step e 3 asks Rotation Process foundation
value × 0.000833; Wherein, n is rotating speed, and AD value is the result that A/D analog to digital converter 51 exports.The range of the A/D analog to digital converter 51 that the present embodiment uses is 65535, and voltage is 20V.
Its corresponding relation is as follows:
0～32767： 0V～+10V；
32768～65535：-10V～0V；
2.73 is voltage and the relation of rotating speed: corresponding 27.3 turns of 10V (this relation is worth by the swept resistance in regulating circuit, and can be other value, here we fix this value, thus the relation be fixed).
Such as: AD value is 10000,
(turning).
The present invention is used for state type electronic speed-determination device and the method for testing thereof of generator, without the need to being arranged on the output shaft of generator, the three-phase output voltage signal only need measuring generator just can measure the rotating speed of generator, it is a kind of static electronic method of testing, impact by environment is less, I&M is easy, and cost is low, failure rate is low.
The foregoing is only preferred embodiments of the present invention, the present invention is not limited to above-mentioned embodiment, as long as the technical scheme realizing the object of the invention with basic same approach all belongs within protection scope of the present invention.
Claims (10)
1., for the state type electronic speed-determination device of generator, it is characterized in that comprising:
Phase voltage sampling module (1), comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively;
Amplifier isolation module (2), comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module (1) and isolation;
Three-phase voltage intersection point sampling module (3), comprises six sample circuits, and described sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period;
Shaping filter module (4), for taking out the analog level shaping after intersection point, filtering;
Digital signal processor (5), for the signal output speed transmitted according to shaping filter module (4);
Power module (6), for providing voltage to input for amplifier isolation module (2), three-phase voltage intersection point sampling module (3), shaping filter module (4), digital signal processor (5).
2. the state type electronic speed-determination device for generator according to claim 1, it is characterized in that: the input signal of described sample circuit is any two phase signals in the three-phase voltage exported through amplifier isolation module (2), this input signal to control to export, exports high level signal when namely described any two-phase signal level is equal for the comparison by operational amplifier.
3. the state type electronic speed-determination device for generator according to claim 1, it is characterized in that: between described three-phase voltage intersection point sampling module (3) and shaping filter module (4), be in series with level switch module (7), for being changed by the incoming level of three-phase voltage intersection point sampling module (3), described three-phase voltage intersection point sampling module (3) is powered by power module (6).
4. the state type electronic speed-determination device for generator according to claim 3, it is characterized in that: be in series with light-coupled isolation module (8) between described level switch module (7) and shaping filter module (4), described light-coupled isolation module (8) is powered by power module (6).
5. the state type electronic speed-determination device for generator according to claim 1, it is characterized in that: described digital signal processor (5) comprises A/D analog to digital converter (51), dsp processor (52), host computer (53), described A/D analog to digital converter (51) is for being converted into digital signal by the analog output signal of shaping filter module (4), the digital signal that described dsp processor (52) transforms according to A/D analog to digital converter (51) tests out rotating speed, and described host computer (53) is for showing rotating speed.
6. the speed-measuring method for the state type electronic speed-determination device of generator, state type electronic speed-determination device wherein for generator comprises: phase voltage sampling module (1), comprises three sample circuits be connected with generator auxiliary winding three-phase voltage output terminal respectively; Amplifier isolation module (2), comprises three discharge circuits be connected with described sample circuit output terminal respectively, for the sampled voltage operation amplifier of phase voltage sampling module (1) and isolation; Three-phase voltage intersection point sampling module (3), comprises six sample circuits, and described sample circuit is for obtaining the voltage signal of six intersection points of three-phase voltage in one-period; Shaping filter module (4), for taking out the analog level shaping after intersection point, filtering; Digital signal processor (5), for the signal output speed transmitted according to shaping filter module (4); Power module (6), for providing voltage to input for amplifier isolation module (2), three-phase voltage intersection point sampling module (3), shaping filter module (4), digital signal processor (5); It is characterized in that: comprise the following steps: A) gather the three-phase output voltage signal of generator by phase voltage sampling module (1); B) amplifier isolation module (2) is to the three-phase voltage signal amplifier isolation collected; C) voltage signal of six intersection points of three-phase voltage in one-period is obtained by three-phase voltage intersection point sampling module (3); D) shaping filter module (4) is to the analog level shaping of taking out after intersection point, filtering; E) digital signal processor (5) is according to the signal output speed after shaping filter.
7. the speed-measuring method of a kind of state type electronic speed-determination device for generator according to claim 6, is characterized in that: described step C changes at the laggard line level of the voltage signal obtaining six intersection points of three-phase voltage in one-period to adjust amplitude.
8. the speed-measuring method of a kind of state type electronic speed-determination device for generator according to claim 7, is characterized in that: described step C adopts light-coupled isolation to promote transmission speed after level conversion.
9. the speed-measuring method of a kind of state type electronic speed-determination device for generator according to claim 6, is characterized in that: described step D comprises: D1) input pulse; D2) regulating impulse; D3) reverse shaped pulse; D4) pulse bandwidth filtering; D5) direct current is exported.
10. the speed-measuring method of a kind of state type electronic speed-determination device for generator according to claim 6, is characterized in that: described step e comprises: E1) input direct-current; E2) analog to digital conversion is carried out to the simulating signal of input; E3) output speed is carried out according to the digital signal input speed function after conversion; E4) rotating speed is shown.
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| CN103675324A (en) * | 2013-12-13 | 2014-03-26 | 中国航空工业集团公司第六三一研究所 | Rotation speed measurement method with anti-shake function |
| CN110470857B (en) * | 2019-09-08 | 2021-04-13 | 陕西航空电气有限责任公司 | Rotating speed detection method suitable for aviation power system generator |
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| KR100428505B1 (en) * | 2001-07-06 | 2004-04-28 | 삼성전자주식회사 | Method of speed speed and flux estimation for induction motor |
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| GB2371427A (en) * | 2000-10-19 | 2002-07-24 | Lg Electronics Inc | Speed control of synchronous reluctance motor |
| CN1481604A (en) * | 2000-12-18 | 2004-03-10 | ��ʽ���簲����� | Method for correcting estimate of speed of induction motor and its device |
| CN1968005A (en) * | 2005-11-14 | 2007-05-23 | 萨比股份公司 | Method to measure the angular speed of an induction motor |
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