CN203502492U - Frequency measuring device for water turbine generator set - Google Patents
Frequency measuring device for water turbine generator set Download PDFInfo
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- CN203502492U CN203502492U CN201320617431.3U CN201320617431U CN203502492U CN 203502492 U CN203502492 U CN 203502492U CN 201320617431 U CN201320617431 U CN 201320617431U CN 203502492 U CN203502492 U CN 203502492U
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Abstract
The utility model discloses a frequency measuring device for a water turbine generator set. The frequency measuring device processes voltage signals of the set and a power grid through a frequency divider and clock pulse signals, can measure frequency signals of the set and the power grid accurately, is relatively stable in measuring result, and can measure signals of the generator frequency and the grid frequency under multiple fractional frequency states simultaneously and phase difference signals of the generator waveform and the power grid waveform, thereby enabling frequency measurement of the set and the power grid to be more accurate, and realizing synchronization and grid connection of the set and the power grid.
Description
Technical field
The utility model relates to hydraulic generator unit field, is specifically related to a kind of frequency measurement grid-connecting apparatus of hydraulic generator unit.
Background technology
Hydraulic generator unit needs to measure in real time the electric voltage frequency of genset in the grid-connected process of start, and Tracking Frequency of Power Grids, with realize unit and electrical network synchronize and grid-connected.Frequency measuring device carries out analyzing and processing to the voltage signal of unit and electrical network, to gather accurately the frequency signal of unit and electrical network.Current frequency measurement circuit has a lot, but owing to being subject to the impact of generator self higher hamonic wave, waveform generation distortion, and frequency measurement signal often can not reflect real voltage waveform signal, causes the grid-connected time lengthening even cannot be grid-connected.
Utility model content
The above defect existing in order to overcome frequency measurement circuit, the object of the utility model patent is to provide a kind of frequency measuring device of hydraulic generator unit, can Measurement accuracy generator and mains frequency, make grid-connected fast and stable.
The technical solution of the utility model: a kind of frequency measuring device of hydraulic generator unit, comprise generator isolating transformer TV1, electrical network isolating transformer TV2, generator voltage signal enters machine filtering shaping circuit frequently after generator isolating transformer TV1 step-down isolation, machine frequently filtering shaping circuit first carries out filtering, amplitude limit, then the Schmidt trigger forming via operational amplifier LM324 is by just sine-shaped, negative half-wave is converted to respectively square-wave signal, this just, the square-wave signal of negative half-wave is inputted respectively control signal port and the clock signal port of 74LS74 double D trigger, by the square-wave signal of negative half-wave as edging trigger signal, and the square-wave signal of positive half-wave is from the same-phase port output of this double D trigger, the square-wave signal of this this positive half-wave is inputted frequency divider CD4520 again after the further shaping of phase inverter, the 8 frequency division output signals of frequency divider CD4520 and clock pulse signal use with Men Xiangyu after send into the high counting number mouth of PLC input end, and its 4 frequency division output signal is also inputted the input port of PLC as the interrupt trigger signal of the high counting number mouth of described PLC input end, mains voltage signal is first through the laggard networking frequency of electrical network isolating transformer TV2 step-down isolation filtering shaping circuit, net frequently filtering shaping circuit first carries out filtering, amplitude limit, then the Schmidt trigger forming via operational amplifier LM324 is by just sine-shaped, negative half-wave is converted to respectively square-wave signal, this just, the square-wave signal of negative half-wave is inputted respectively control signal port and the clock signal port of 74LS74 double D trigger, by the square-wave signal of negative half-wave as edging trigger signal, and the square-wave signal of positive half-wave is from the same-phase port output of this double D trigger, this signal is sent into the counting mouth of PLC input end again after the further shaping of phase inverter.
In negative half wave shaping circuit of described machine frequency filtering shaping circuit, be incorporated to a delay capacitor C7, as clock signal, the negative half-wave level of input 74LS74 double D trigger carried out to time delay.
The machine producing through Schmidt trigger frequently, the square-wave signal while is also transfused to and door net frequently, generate phase angle difference signal, again clock pulse signal and this phase angle difference signal are inputted to the high counting number mouth that superposes with door and input PLC, obtain the phase signal of generator waveform and electrical network waveform.
The frequency of described clock pulse signal is 100KHz.
Described clock pulse signal is produced through frequency divider by crystal oscillating circuit.
Described machine frequently filtering shaping circuit is comprised of resistance R 1 ~ R6, capacitor C 1 ~ C6, diode D1 ~ D4.
Described net frequently filtering shaping circuit is comprised of resistance R 11 ~ R16, capacitor C 11 ~ C16, diode D5 ~ D8.
The frequency measuring device of hydraulic generator unit of the present utility model is processed the voltage signal of unit and electrical network by frequency divider and clock pulse signal, can measure comparatively accurately the frequency signal of unit and electrical network, measurement result is comparatively stable, energy is the signal of measuring machine frequently and under a plurality of frequency division states of net frequency simultaneously, and the phase signal of generator waveform and electrical network waveform, make the frequency measurement of unit and electrical network more accurate, with realize unit and electrical network synchronize and grid-connected.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is that clock pulse signal produces electrical block diagram.
Embodiment
As Fig. 1, come the secondary voltage signal of self generating sets first through generator isolating transformer TV1 step-down isolation, to enter machine filtering shaping circuit frequently, machine frequency filtering shaping circuit is by resistance R 1 ~ R6, capacitor C 1 ~ C6, diode D1 ~ D4 forms, the Schmidt trigger forming through operational amplifier LM324 is again by the shaping export positive and negative two road square-wave signals respectively of the positive and negative half-wave of AC sine wave, positive and negative two road square-wave signals are inputted respectively control signal port 4 and the clock signal port 3 of the double D trigger being comprised of 74LS74, wherein the square-wave signal of negative half-wave is as edging trigger signal input clock signal port 3, and the square-wave signal of positive half-wave is from the same-phase port output of this double D trigger, because 74LS74 is a kind of edge triggered flip flop, edging trigger when clock signal is come only, so when input signal occurs changing due to interference, the output signal of trigger can not affect, guarantee normal signal output.Simultaneously at negative half wave shaping circuit (by LM324, resistance R 9, R10 composition) in, be incorporated to a delay capacitor C7, the effect of delay capacitor C7 is that the negative half-wave square-wave signal that inputs to double D trigger as clock signal is carried out to time delay, the accuracy in order to guarantee that clock signal triggers like this, because after negative half-wave square-wave signal is carried out to time delay, in negative half-wave square-wave signal and positive half-wave square-wave signal sequential, overlap, can guarantee so certainly to have positive half-wave square-wave signal input double D trigger when negative half-wave square-wave signal is to double D trigger edging trigger, can guarantee like this accuracy of counting.
The square-wave signal of positive half-wave enters the input pin 1 of frequency divider CD4520 from double D trigger output after two phase inverter shapings again, wherein 8 frequency division output signals of pin 5 through the time clock phase with door and 100KHZ with after input the high counting number mouth of PLC, 4 fractional frequency signals of pin 4 outputs are as interrupting and trigger pulse accesses the input end of PLC.Use frequency divider that the wave-shape amplitude of square-wave signal is broadened, be conducive to the copped wave of cutting apart of subsequent pulse signal, by square-wave signal with the clock pulse signal of 100KHZ through with door (U6A) with, just increased the frequency of square-wave signal greatly, in the time of counting, increased greatly accuracy.
Secondary voltage signal from electrical network first enters net filtering shaping circuit frequently through electrical network isolating transformer TV2 step-down isolation, net frequently filtering shaping circuit is comprised of resistance R 11 ~ R16, capacitor C 11 ~ C16, diode D5 ~ D8, then through the Schmidt trigger of operational amplifier LM324 composition to the shaping export positive and negative two road square-wave signals respectively of the positive and negative half-wave of AC sine wave.Described two road square-wave signals are inputted respectively control signal port one 1 and the clock signal port 10 of the double D trigger being comprised of 74LS74.Output signal enters the high counting number mouth of PLC again after phase inverter shaping.Net measuring principle is frequently frequently the same with machine, and just, because net is frequently conventionally more stable, net has omitted frequency dividing circuit and time clock in metering circuit frequently.
The machine producing through Schmidt trigger in addition frequently, net frequently positive half-wave square-wave signal be transfused to simultaneously with door (U6C) with, generate phase angle difference signal, again time clock and this phase angle difference signal are inputted to the high counting number mouth that superposes with door (U6D) and input PLC, so just obtained the phase signal of generator waveform and electrical network waveform.
Claims (7)
1. the frequency measuring device of a hydraulic generator unit, it is characterized in that, comprise generator isolating transformer TV1, electrical network isolating transformer TV2, generator voltage signal enters machine filtering shaping circuit frequently after generator isolating transformer TV1 step-down isolation, machine frequently filtering shaping circuit first carries out filtering, amplitude limit, then the Schmidt trigger forming via operational amplifier LM324 is by just sine-shaped, negative half-wave is converted to respectively square-wave signal, this just, the square-wave signal of negative half-wave is inputted respectively control signal port and the clock signal port of 74LS74 double D trigger, by the square-wave signal of negative half-wave as edging trigger signal, and the square-wave signal of positive half-wave is from the same-phase port output of this double D trigger, the square-wave signal of this positive half-wave is inputted frequency divider CD4520 again after the further shaping of phase inverter, the 8 frequency division output signals of frequency divider CD4520 and clock pulse signal use with Men Xiangyu after send into the high counting number mouth of PLC input end, and its 4 frequency division output signal is also inputted the input port of PLC as the interrupt trigger signal of the high counting number mouth of described PLC input end, mains voltage signal is first through the laggard networking frequency of electrical network isolating transformer TV2 step-down isolation filtering shaping circuit, net frequently filtering shaping circuit first carries out filtering, amplitude limit, then the Schmidt trigger forming via operational amplifier LM324 is by just sine-shaped, negative half-wave is converted to respectively square-wave signal, this just, the square-wave signal of negative half-wave is inputted respectively control signal port and the clock signal port of 74LS74 double D trigger, by the square-wave signal of negative half-wave as edging trigger signal, and the square-wave signal of positive half-wave is from the same-phase port output of this double D trigger, this signal is sent into the counting mouth of PLC input end again after the further shaping of phase inverter.
2. the frequency measuring device of a kind of hydraulic generator unit according to claim 1, it is characterized in that, in negative half wave shaping circuit of described machine frequency filtering shaping circuit, be incorporated to a delay capacitor C7, as clock signal, the negative half-wave level of input 74LS74 double D trigger carried out to time delay.
3. the frequency measuring device of a kind of hydraulic generator unit according to claim 1, it is characterized in that, the machine producing through Schmidt trigger frequently, the square-wave signal while is also transfused to and door net frequently, generate phase angle difference signal, again clock pulse signal and this phase angle difference signal are inputted to the high counting number mouth that superposes with door and input PLC, obtain the phase signal of generator waveform and electrical network waveform.
4. the frequency measuring device of a kind of hydraulic generator unit according to claim 1, is characterized in that, the frequency of described clock pulse signal is 100KHz.
5. the frequency measuring device of a kind of hydraulic generator unit according to claim 4, is characterized in that, described clock pulse signal is produced through frequency divider by crystal oscillating circuit.
6. the frequency measuring device of a kind of hydraulic generator unit according to claim 1, is characterized in that, described machine frequently filtering shaping circuit is comprised of resistance R 1 ~ R6, capacitor C 1 ~ C6, diode D1 ~ D4.
7. the frequency measuring device of a kind of hydraulic generator unit according to claim 1, is characterized in that, described net frequently filtering shaping circuit is comprised of resistance R 11 ~ R16, capacitor C 11 ~ C16, diode D5 ~ D8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617431.3U CN203502492U (en) | 2013-10-08 | 2013-10-08 | Frequency measuring device for water turbine generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617431.3U CN203502492U (en) | 2013-10-08 | 2013-10-08 | Frequency measuring device for water turbine generator set |
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| Publication Number | Publication Date |
|---|---|
| CN203502492U true CN203502492U (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320617431.3U Expired - Fee Related CN203502492U (en) | 2013-10-08 | 2013-10-08 | Frequency measuring device for water turbine generator set |
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| CN (1) | CN203502492U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487650A (en) * | 2013-10-08 | 2014-01-01 | 水利部农村电气化研究所 | Frequency measurement device of hydroelectric generating set |
-
2013
- 2013-10-08 CN CN201320617431.3U patent/CN203502492U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487650A (en) * | 2013-10-08 | 2014-01-01 | 水利部农村电气化研究所 | Frequency measurement device of hydroelectric generating set |
| CN103487650B (en) * | 2013-10-08 | 2015-10-14 | 水利部农村电气化研究所 | A kind of frequency measuring device of turbine-generator units |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20161008 |
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| CF01 | Termination of patent right due to non-payment of annual fee |