CN1038884A - Synchronous phase-angle detector for synchro-generator - Google Patents
Synchronous phase-angle detector for synchro-generator Download PDFInfo
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- CN1038884A CN1038884A CN 88103741 CN88103741A CN1038884A CN 1038884 A CN1038884 A CN 1038884A CN 88103741 CN88103741 CN 88103741 CN 88103741 A CN88103741 A CN 88103741A CN 1038884 A CN1038884 A CN 1038884A
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- 238000001914 filtration Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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Abstract
A kind of synchronous phase-angle detector for synchro-generator.Belong to the Automation of Electric Systems instrument field.This detecting device is to utilize frequency divider that the square-wave signal elder generation frequency division of set end voltage and system voltage 50Hz is carried out bit comparison mutually again, and its output characteristics is linear within-180 to+180 ° of scopes in phase angle difference, and output voltage directly reflects the positive negativity of phase angle difference.The realization simple in structure, easy of this instrument hardware, cost are low.
Description
The invention belongs to Automation of Electric Systems technology of instrument and meter field.
Synchronous generator and system carry out quasi-synchronization paralleling operation, require generator and system synchronization, require promptly to satisfy simultaneously that voltage equates, identical, identical three conditions of phase place of frequency.In these three conditions, the detection of phase condition is particularly important.At present, the detection method to phase angle difference in the synchronous generator synchronizing process is having two classes aspect the example, in hardware both at home and abroad, and the first adopts simulation, digital hybrid circuit form to realize detecting device; Another kind is to adopt single card microcomputer or chip microcontroller detecting device.On measuring principle, no matter take which kind of example, in hardware, all be foundation and machine end and the synchronous square-wave signal of the 50Hz of system sine voltage signal, measure phase angle difference through logical process, output processing procedure.There is the problem of two aspects in above-mentioned several measuring method:
(1) output characteristics of Ce Lianging can not realize linearity in phase angle difference between-180 ° to+180 ° scopes;
(2) the output result of Ce Lianging can not easy, directly reflect the positive negativity of phase angle difference.Accompanying drawing 1 is depicted as the output characteristics of existing measurement synchronization generator phase angle detection circuit, and as can be seen from the figure, no matter phase angle difference is for just still bearing V
0Value be on the occasion of, so can not be easily, directly from V
0In reflect the positive negativity of phase angle difference.In order to overcome above-mentioned shortcoming, take thousand and one way, as judging it is positive phase angle or negative angular difference with manual method; Also useful microcomputer-based intelligent is judged positive and negative phase angle difference.
Purpose of the present invention is intended to overcome the deficiency of above-mentioned prior art, a kind of implementation method that a kind of method is simple, measuring accuracy is high is proposed, can directly judge the positive negativity of phase angle difference easily according to output voltage from measuring output characteristics, and in phase angle is-180 ° to+180 ° scopes, realize linear.
Chief component of the present invention is voltage comparator, logic reversal device, 2 frequency dividing circuits, phase comparator, twin-T filter, output processor.The 50H of system and machine end
ZThe sine voltage signal converts 50H to through voltage comparator
ZSquare-wave signal is handled through logic reversal, 2 frequency divisions then.Signal after the processing send phase comparator to carry out the phase bit comparison, after double-t filter is delivered to output processor and handled, just obtains output signal V
0
Compared with the prior art the present invention has following advantage:
(1) output characteristics is linear within-180 ° to+180 ° scopes in phase angle difference;
(2) output voltage directly reflects the positive negativity of phase angle difference;
(3) hardware configuration simple, easily realize, cost is low.
Description of drawings:
The output characteristics of Fig. 1 prior art measurement synchronization generator phase angle detection circuit;
Fig. 2 synchronous phase-angle detector for synchro-generator theory diagram;
1,2, voltage comparator among the figure:; 3, two-divider; 4, logic reversal device; 5, two-divider; 6, phase comparator; 7, twin-T filter; 8, output processor.
Fig. 3 synchronous phase-angle detector for synchro-generator circuit theory diagrams;
The output characteristics of Fig. 4 synchronous phase-angle detector for synchro-generator;
Fig. 5 phase comparator schematic diagram;
V when Fig. 6 phase angle difference is 0 °
' 0Waveform transformation figure;
V when Fig. 7 phase angle difference is+180 °
' 0Waveform transformation figure;
V when Fig. 8 phase angle difference is-180 °
' 0Waveform transformation figure.
Further describe structure of the present invention below in conjunction with accompanying drawing:
Fig. 3 is the synchronous phase-angle detector for synchro-generator circuit theory diagrams.The 50H of system
ZThe 50H of sine voltage signal Vs, machine end
ZSine voltage signal Vt through over-voltage comparator (9), (10), converts thereof into synchronous 50H respectively
ZSquare-wave signal.System 50H
ZSquare-wave signal is handled through 2 frequency dividing circuits (11), and the 25Hz square-wave signal after the processing is sent to phase comparator (14) and carries out the phase bit comparison; Meanwhile, machine end 50Hz square wave is handled the 25H after the processing through logic reversal (12) computing and through 2 frequency divisions (13)
ZThe reverse input end that square wave is sent to phase comparator (14) carries out the phase bit comparison.The output of phase comparator is through 25H
ZTwin-T filter (15) filtering, pass through output processor (16) again and carry out signal Processing.
Fig. 5 is the circuit theory diagrams of phase comparator, and two input ends are arranged, a positive input V
+, another is to input end V
-The logical operation formula of phase comparator is:
Be expressed as with the level form:
" 0 " expression low level, " 1 " expression high level.Can know from Fig. 6,7,8 and to find out output signal V
' 0With
, Vt
2Frequency be the same, only change V on the waveform
' 0For the time of high level has only V
+Be high level, V
-Occur during for low level.
The effect of twin-T filter: because of V
' 0Be a 25H
zCyclical signal, and output result and V
' 0Mean value relation is arranged, thereby need take out V by filtering
' 0Mean value voltage.
The output processing links has two effects: the first continues filtering, improves final output direct current signal quality; It two is the calculating of finishing following formula:
V
0=(V
' 0Mean value-3.75V) * 2
For the square-wave signal that an amplitude is 15V, its mean value is:
15V * (V ' in the one-period
0The time of high level)/(time of one-period)
Further describe phase angle difference below and be 0 ° ,+output voltage V under 180 ° ,-180 ° three kinds of situations
0:
1. Fig. 6 is phase differential V when being 0 °
' 0The transition process oscillogram.Vs is a bus voltage signal; Vs ' exports synchronous square wave through voltage comparator; Vs '
2It is the waveform behind 2 frequency divisions; Vt is the set end voltage signal; Vt ' exports synchronous square wave through voltage comparator; Vt ' is the logic reversal waveform of Vt '; Vt '
2It is the waveform behind 2 frequency divisions; V
0' be phase comparator output square-wave signal, its width of cloth is 15V, at this moment V
0Value be:
V
0=(V
0' mean value-3.75) * 2
＝（15V/4-3.75）×2
=0V(DC voltage)
2. Fig. 7 is phase angle difference V when being+180 °
0' waveform transition process figure, this moment V
0Value be:
V
0=(V
0' mean value-3.75) * 2
＝（15V/2-3.75）×2
=7.5V(DC voltage)
3. Fig. 8 is phase angle V when being-180 °
0' waveform transition process figure, this moment V
0Value be:
V
0＝（0v-3.75）×2
=-7.5V(DC voltage)
4. measure relation: can draw such result by Fig. 6,7,8: phase angle difference be 0 ° ,+during 180 ° ,-180 ° three kinds of representative values, phase angle difference and output voltage V
0Between meet output characteristics shown in Figure 4.
Claims (2)
1, a kind of synchronous phase-angle detector for synchro-generator is characterized in that being made of voltage comparator, logic reversal device, 2 frequency dividing circuits, phase comparator, twin-T filter, output processor.
2, phase-angle detector for synchro according to claim 1 is characterized in that the 50H of set end voltage and system voltage
ZSquare-wave signal carries out respectively utilizing 2 25Hz square-wave signals to carry out the phase bit comparison behind the two divided-frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103741 CN1017558B (en) | 1988-06-24 | 1988-06-24 | Synchronous phase-angle detector for synchro-generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103741 CN1017558B (en) | 1988-06-24 | 1988-06-24 | Synchronous phase-angle detector for synchro-generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038884A true CN1038884A (en) | 1990-01-17 |
| CN1017558B CN1017558B (en) | 1992-07-22 |
Family
ID=4832728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88103741 Expired CN1017558B (en) | 1988-06-24 | 1988-06-24 | Synchronous phase-angle detector for synchro-generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017558B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510713A (en) * | 2014-09-26 | 2016-04-20 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN106841779A (en) * | 2016-12-09 | 2017-06-13 | 华中农业大学 | Phase difference accurate measuring systems and measuring method based on frequency dividing mode |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776712A (en) * | 2010-02-11 | 2010-07-14 | 郑琛 | Phasing tester |
-
1988
- 1988-06-24 CN CN 88103741 patent/CN1017558B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510713A (en) * | 2014-09-26 | 2016-04-20 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN105510713B (en) * | 2014-09-26 | 2018-06-22 | 中微半导体设备(上海)有限公司 | Phase comparator and phase difference monitoring device |
| CN106841779A (en) * | 2016-12-09 | 2017-06-13 | 华中农业大学 | Phase difference accurate measuring systems and measuring method based on frequency dividing mode |
| CN106841779B (en) * | 2016-12-09 | 2023-03-28 | 华中农业大学 | Phase difference accurate measurement system and method based on frequency division mode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017558B (en) | 1992-07-22 |
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