CN103018580B - Method and device for detecting vector transformation of three-phase power phase sequence - Google Patents
Method and device for detecting vector transformation of three-phase power phase sequence Download PDFInfo
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Abstract
The invention relates to a method for detecting vector transformation of a three-phase power phase sequence. The method is characterized by including the steps of S1, converting input three-phase electricity into a low-voltage signal; S2, subjecting the low-voltage signal to vector transformation, zero balancing and wired processing; S3, judging the signal subjected to wired processing and obtaining an output signal. The invention further provides a device for detecting vector transformation of the three-phase power phase sequence. The device which is a simple phase sequence detecting device has the advantages of simple circuit, convenience and reliability in control and strong expandability, and has a function of default phase detection.
Description
Technical field
The present invention relates to three-phase electricity detection field, especially a kind of vector method and device detecting three-phase phase sequence.
Background technology
Traditional circuit of testing the phase sequence adopts RC bridge method usually, and Zero-cross comparator interrupts method in conjunction with CPU, and AD sampling is in conjunction with CPU determining method.Wherein, RC bridge method is the simplest, but during this method detection phase shortage, influence by voltage is comparatively large, and parameter is more difficult adjustment generally; Latter two method detects reliable, but all needs CPU to participate in controlling, and consumes more cpu resource, participate in without CPU in control or the more nervous system of cpu resource inapplicable.
Current circuit of testing the phase sequence generally by the AD converter sampling line voltage of CPU, calculates the phase sequence of three-phase electricity, as long as the suitable this method of algorithm can well complete Phase sequence detection work by certain algorithm in CPU inside.But the occasion that the band CPU that the method is only applicable to some more complicated controls, inapplicable to the occasion of some simple application.
Mentioned circuit of testing the phase sequence versatility is all poor above, cannot carry out exchange use between distinct methods by simple circuit change, portable poor.
Summary of the invention
In view of this, the object of this invention is to provide a kind of vector method detecting three-phase phase sequence.
Another object of the present invention is to provide a kind of vector device detecting three-phase phase sequence.
The present invention adopts following scheme to realize: a kind of vector method detecting three-phase phase sequence, is characterized in that: comprise the following steps:
S1: the three-phase electricity of input is converted to low-voltage signal;
S2: vector and Zero-cross comparator are carried out to this low-voltage signal, and carry out line and process;
S3: obtain an output signal after the signal after line and process is judged.
In an embodiment of the present invention, in described step S2 to the concrete steps that this low-voltage signal carries out vector be:
S21: any two-phase of getting this low-voltage signal;
S22: be the Phase delay 60 degree of leading phase signal by wherein default setting;
S23: be the Phase advance 60 degree of delayed phase signals by wherein default setting;
S24: the phase place of residue phase signals is carried out anti-phase process.
In an embodiment of the present invention, in described step S3 to line with process after signal judge, concrete determination methods is: if this signal is dutycycle be 50% square-wave signal, then three-phase electricity input signal phase sequence is correct, if this signal is low level signal, then three-phase electricity input signal phase sequence mistake.
In an embodiment of the present invention, described output signal can be used in triggering indicating circuit, signal circuit, warning circuit or protection circuit.
The present invention also provides a kind of vector device detecting three-phase phase sequence, it is characterized in that: comprise three-phase electricity input detection module, a phase vectors conversion module, a signal acquisition process module and an output module; Described three-phase electricity input detection module receives three-phase electricity to be detected, and this three-phase electricity to be detected is converted to low-voltage signal; Described phase vectors conversion module receives this low-voltage signal and carries out vector and Zero-cross comparator to it, then carries out line and process; Described signal acquisition process module receive described phase vectors conversion module carry out line with process after signal carry out judging and obtain an output signal; Described output module receives this output signal; Described more delayed than U phase signals 120 degree of phase vectors conversion module default setting V phase signals, described more delayed than V phase signals 120 degree of phase vectors conversion module default setting W phase signals.
In an embodiment of the present invention, described phase vectors conversion module adopts RC phase-shift circuit, LC phase-shift circuit or RL phase-shift circuit.
In an embodiment of the present invention, described signal acquisition process module adopts hardware detection, software detection or software and hardware combining to detect.
In an embodiment of the present invention, described output module comprises indicating circuit, signal circuit, warning circuit or protection circuit.
Technical scheme of the present invention is: three-phase electricity input detection module detects three-phase electricity signal, then phase vectors conversion module is delivered to, any two signal phase shifts that phase vectors conversion module inputs it, wherein will move 60 degree after default setting leading phase signal, to wherein the delayed phase signals of default setting move forward 60 degree, anti-phase 180 degree of phase signals will be remained again, signal after phase shift is delivered to signal acquisition process module after Zero-cross comparator doubling with process, exports corresponding signal after signal acquisition process resume module and deliver to output module.The inventive system comprises three-phase electricity input detection module, phase vectors conversion module, signal acquisition process module and output module.Compared with prior art, a kind of vector device detecting three-phase phase sequence of the present invention can make a kind of detection device for phase sequence participating in controlling without the need to CPU, possess circuit simple, control to facilitate reliable feature, carry out signal output by simple indication warning circuit, also can be adjusted to the circuit possessing pile defection function simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram detecting the vector device of three-phase phase sequence of the present invention.
Fig. 2 is that in one embodiment of the invention, U phase and V phase adopt the phase vectors conversion module of RC phase shift system and the schematic diagram of signal acquisition process module.
Fig. 3 a be one embodiment of the invention phase sequence correct time vector figure;
Fig. 3 b-3d be one embodiment of the invention phase sequence correct time oscillogram;
Vector figure when Fig. 4 a is one embodiment of the invention phase sequence mistake;
Oscillogram when Fig. 4 b-4d is one embodiment of the invention phase sequence mistake;
Fig. 5 is that in another embodiment of the present invention, U phase and V phase adopt RC phase shift system and the additional phase vectors conversion module of pile defection function and the schematic diagram of signal acquisition process module;
Fig. 6 a-6c is another embodiment of the present invention W phase phase shortage and U phase and V phase phase sequence are correct, cancels oscillogram during phase shortage alarm function;
Fig. 7 a-7c be another embodiment of the present invention U phase phase shortage and V phase and W phase phase sequence mistake time oscillogram.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below by specific embodiment and relevant drawings, the present invention will be described in further detail.
The invention provides a kind of vector method detecting three-phase phase sequence, it is characterized in that: comprise the following steps:
S1: the three-phase electricity of input is converted to low-voltage signal;
S2: vector and Zero-cross comparator are carried out to this low-voltage signal, and carry out line and process;
S3: obtain an output signal after the signal after line and process is judged.
The present invention also provides a kind of vector device detecting three-phase phase sequence, it is characterized in that: comprise three-phase electricity input detection module, a phase vectors conversion module, a signal acquisition process module and an output module; Described three-phase electricity input detection module receives three-phase electricity to be detected, and this three-phase electricity to be detected is converted to low-voltage signal; Described phase vectors conversion module receives this low-voltage signal and carries out vector and Zero-cross comparator to it, then carries out line and process; Described signal acquisition process module receive described phase vectors conversion module carry out line with process after signal carry out judging and obtain an output signal; Described output module receives this output signal; Described more delayed than U phase signals 120 degree of phase vectors conversion module default setting V phase signals, described more delayed than V phase signals 120 degree of phase vectors conversion module default setting W phase signals.
As shown in Figure 1, a kind of vector device detecting three-phase phase sequence, is characterized in that: comprise three-phase electricity input detection module 1, phase vectors conversion module 2, signal acquisition process module 3 and an output module 4; Described three-phase electricity input detection module 1 receives three-phase electricity to be detected, and this three-phase electricity to be detected is converted to low-voltage signal; Described phase vectors conversion module 2 receives this low-voltage signal and carries out vector and Zero-cross comparator to it, then carries out line and process; Described signal acquisition process module 3 receive described phase vectors conversion module 2 carry out line with process after signal carry out judging and obtain an output signal; Described output module 4 receives this output signal; Described more delayed than U phase signals 120 degree of phase vectors conversion module 2 default setting V phase signals, described more delayed than V phase signals 120 degree of phase vectors conversion module default setting W phase signals.
A kind of principle of work detecting the vector device of three-phase phase sequence of the present invention is: three-phase electricity input detection module 1 is sampled successively and inputted three-phase electricity and deliver to phase vectors conversion module 2 after being converted to low-voltage signal; Phase vectors conversion module 2 gets any two input signals, 60 degree are moved by after default setting leading phase signal, by delayed for default setting phase signals reach 60 degree, anti-phase 180 degree of phase signals will be remained again, signal after phase shift delivers to signal acquisition process module 3 after Zero-cross comparator doubling with process, signal acquisition process module 3 processes according to the output signal of phase vectors conversion module 2, then outputs signal to output module 4.If export after phase vectors conversion module 2 converts to be dutycycle be 50% square-wave signal, then input phase sequence correct, if output low level signal, then input signal phase sequence mistake (wherein two phase signals phase sequences make a mistake) after phase vectors conversion module 2 converts.
As shown in Figure 2, that in one embodiment of the invention, U phase and V phase adopt the phase vectors conversion module 2 of RC phase shift system and the schematic diagram of signal acquisition process module 3, signal acquisition process module 3 adopts hardware detection pattern, so judge after carrying out filtering by a filter network to the signal gathered; Phase vectors conversion module 2 comprises electric capacity C11, electric capacity C12, resistance R11, resistance R12, comparer IC11, comparer IC12, comparer IC13, the U phase input end of described phase vectors conversion module 2, V phase input end and W phase input end and three-phase electricity input U phase output terminal, the V phase output terminal of detection module 1 and W phase output terminal is corresponding is linked in sequence, more advanced than V phase signals 120 degree of default setting U phase signals, more advanced than W phase signals 120 degree of V phase signals; One end of described resistance R11 is the U phase signals input end of described phase vectors conversion module 2, and the other end of resistance R11 connects one end of described electric capacity C11 and the positive input terminal of described comparer IC11; One end of described electric capacity C12 is the V phase signals input end of described phase vectors conversion module 2, and the other end of described electric capacity C12 is connected to one end of described resistance R12 and the positive input terminal of described comparer IC12; The negative input end of described comparer IC13 is the W phase signals input end of described phase vectors conversion module 2, the input end of described signal acquisition process module 3 is connected, the other end ground connection of the negative input end of described comparer IC11, the negative input end of comparer IC12, the positive input terminal of comparer IC13, the other end of resistance R12 and electric capacity C11 as the output terminal of described phase vectors conversion module 2 after the output terminal of described comparer IC11, the output terminal of comparer IC12 are connected with the output terminal of comparer IC13.
Wherein, signal acquisition process module 3 is filtering circuit, comprises resistance R13, resistance R14 and electric capacity C13; One end of described resistance R13 is as the input end of described signal acquisition process module 3, the other end of described resistance R13 as described signal acquisition process module 3 output terminal and connect one end of described resistance R14 and one end of electric capacity C13, the other end of described resistance R14 connects positive supply VCC, the other end ground connection of described electric capacity C13.
In the present embodiment, the advanced V phase signals of default setting U phase signals, then U phase signals is moved backward 60 degree, the past reach 60 degree of V phase signals, then the signal after phase shift is carried out Zero-cross comparator respectively by comparer IC11, comparer IC12, again remaining W phase signals is directly carried out anti-phase process (i.e. phase shift 180 degree) and Zero-cross comparator by comparer IC13, then by the direct line of output signal of three comparers (comparer IC11, comparer IC12 and comparer IC13) with.If the three-phase phase sequence of access is correct, as shown in Figure 3 a, the waveform of the input signal U phase of phase vectors conversion module 2, V phase and W phase as shown in Figure 3 b for signal U1 then after the phase vectors figure of the input signal U phase of phase vectors conversion module 2, V phase and W phase and input signal U phase and the phase shift of V phase and V1 phase vectors figure, the waveform of signal U1 and V1 as shown in Figure 3 c, the waveform of signal U2 and V2 after the anti-phase and signal W2 after Zero-cross comparator and signal U1 of W phase and V1 Zero-cross comparator as shown in Figure 3 d, signal U2, V2 and W2 are the same cycle, same-phase, be 50% square-wave signal with the dutycycle of amplitude, signal U2, V2 and W2 line with after signal deliver to signal acquisition process module 3 filtering process after output signal S, the parameter of regulating resistance R13, resistance R14 and electric capacity C13 can ensure that output signal S is high level, and the waveform of output signal S as shown in Figure 3 d, if the three-phase phase sequence incorrect (assuming that V phase and W phase phase sequence mistake) of access, reality accesses the U phase of phase vectors conversion module 2 input end, V phase and W phase signals phase vectors figure as shown in fig. 4 a, the advanced W phase 120 degree of U phase, the advanced V phase 120 degree of W phase, now by moving 60 degree after acquiescence leading phase U, delayed phase V phase will be given tacit consent to move forward 60 degree, as shown in fig. 4 a, the waveform of the input signal U phase of phase vectors conversion module 2, V phase and W phase as shown in Figure 4 b for its phase vectors Transformation Graphs, the waveform of signal U1 and V1 as illustrated in fig. 4 c, anti-phase and the waveform of signal U2 and V2 of the signal W2 of Zero-cross comparator and signal U1 and V1 Zero-cross comparator of residue phase (W phase) 180 degree as shown in figure 4d, signal U2, V2 and W2 is the same cycle, same amplitude, dutycycle is 50% but phase place differs the square wave of 120 degree mutually, these three signal (signal U2, V2 and W2) line and rear be low level signal, that this signal obtains after signal acquisition process module 3 filtering is low level signal S1, the waveform of output signal S1 as shown in figure 4d, this signal delivers to output module 4, carry out input phase sequence abnormal show, alarm and protection act.
Above-mentioned is that U phase of the present invention adopts a specific embodiment of RC phase shift system with V phase, adopts the embodiment of other phase shift systems still to belong to patent right scope of the present invention to any two-phase.
Fig. 5 is that in another embodiment of the present invention, U phase and V phase adopt RC phase shift system and the additional phase vectors conversion module of pile defection function and the schematic diagram of signal acquisition process module.
In the present embodiment, phase vectors conversion module 2 comprises electric capacity C21, electric capacity C22, resistance R21, resistance R22, resistance R25, resistance R26, resistance R27, resistance R28, comparer IC21, comparer IC22, comparer IC23, the U phase input end of described phase vectors conversion module 2, V phase input end and W phase input end and three-phase electricity input U phase output terminal, the V phase output terminal of detection module 1 and W phase output terminal is corresponding is linked in sequence, more advanced than V phase signals 120 degree of default setting U phase signals, more advanced than W phase signals 120 degree of V phase signals; One end of described resistance R21 is the U phase signals input end of described phase vectors conversion module 2, and the other end of resistance R21 connects one end of described electric capacity C21 and the positive input terminal of described comparer IC21; One end of described electric capacity C22 is the V phase signals input end of described phase vectors conversion module 2, and the other end of described electric capacity C22 is connected to one end of described resistance R22 and the positive input terminal of described comparer IC22; The negative input end of described comparer IC23 is the W signal input part of described phase vectors conversion module 2, is connected the input end of described signal acquisition process module 3 after the described output terminal of comparer IC21, the output terminal of comparer IC22 are connected with the output terminal of comparer IC23 as the output terminal of described phase vectors conversion module 2; The other end of described resistance R22 and the other end ground connection of electric capacity C21; One end of described resistance R25 connects positive supply+VCC, the other end of described resistance R25 connects the negative input end of one end of described resistance R26, the negative input end of described comparer IC21 and described comparer IC22, the other end ground connection of described resistance R26 also connects one end of described resistance R27, the other end of described resistance R27 connects one end of described resistance R28 and the positive input terminal of described comparer IC23, and the other end of described resistance R28 connects negative supply-VCC.
Wherein, signal acquisition process module 3 is filtering circuit, comprises resistance R23, resistance R24 and electric capacity C23; One end of described resistance R23 is as the input end of described signal acquisition process module 3, the other end of described resistance R23 as described signal acquisition process module 3 output terminal and connect one end of described resistance R24 and one end of electric capacity C23, the other end of described resistance R24 connects positive supply VCC, the other end ground connection of described electric capacity C23.
The benchmark of comparer IC21 and comparer IC22, by newly-increased resistance R25, resistance R26, resistance R27, resistance R28, is adjusted to the positive level of a little higher than 0 level, is adjusted to by the benchmark of comparer IC23 slightly lower than the negative level-Vc of 0 level by the present embodiment.
If the three-phase phase sequence of access is correct, as shown in Figure 3 a, the waveform of the input signal U phase of phase vectors conversion module 2, V phase and W phase as shown in Figure 3 b for signal U1 then after the phase vectors figure of the input signal U phase of phase vectors conversion module 2, V phase and W phase and input signal U phase and the phase shift of V phase and V1 phase vectors figure; The waveform of signal U1 and V1 as shown in Figure 3 c; Signal U2 after the anti-phase and signal W2 after Zero-cross comparator and signal U1 of W phase and V1 Zero-cross comparator and V2 waveform are as shown in accompanying drawing 3d; Signal U2, V2 and W2 are the same cycle, same-phase, be 50% square-wave signal with the dutycycle of amplitude, signal U2, V2 and W2 line with after signal deliver to signal acquisition process module 3 filtering process after output signal S, the parameter of regulating resistance R13, resistance R14 and electric capacity C13 can ensure that output signal S is high level, and its waveform is as shown in accompanying drawing 3d; If the three-phase phase sequence incorrect (supposing W phase fault) of access, a phase (W phase) no signal of fault.Because W phase lacks; there is unstable voltage noise in the negative input end of comparer IC23; but the benchmark due to comparer IC23 is the negative level lower than 0 level; therefore comparer IC23 output low level W2; no matter now comparer IC22 exports U2 and comparer IC21 and exports V2 signal; all dragged down as low level by W2; i.e. phase vectors conversion module 2 output low level signal; this signal is through signal acquisition process module 3; still output low level signal; this signal delivers to output module 4, carries out input abnormal show, alarm and protection act.
If desired phase shortage alarm function is cancelled, positive supply+VCC in Fig. 5 and the position of negative supply-VCC is only needed mutually to exchange, what then the signal of phase shortage exported after comparer process is all high level signal, does not affect the process of other road signals, detection and judgement.As shown in fig. 6a-6c, be another embodiment of the present invention W phase phase shortage and U phase and V phase phase sequence correct time, cancel the oscillogram of phase shortage warning function; When phase sequence access correctly but wherein a fault time (supposing W phase fault), U phase and V phase two phase voltage still meet correct phase relation.Signal U1 and the coincidence of V1 phase vectors is obtained after U phase and the phase shift of V phase, signal U1 and V1 is respectively through two-way comparator circuit, square-wave signal U2 and V2 that two dutycycles are approximately 50% is obtained more afterwards with the negative level slightly lower than 0 level, two signal phases overlap, because W phase lacks, it is high level that comparer IC23 exports W2, signal U2, V2 and W2 line with after signal deliver to signal acquisition process module 3 filtering process after output signal S2, the parameter of regulating resistance R23, resistance R24 and electric capacity C23 can ensure that output signal S2 is high level signal.
As shown in Fig. 7 a-7c, be another embodiment of the present invention U phase phase shortage and V phase and W phase phase sequence mistake time oscillogram, when phase sequence access incorrect and wherein a phase fault time (suppose U phase fault, V phase and W phase phase sequence mistake), the now advanced V phase 120 degree of W phase, U1 still no signal after the phase shift of U phase no signal, it is signal V1 afterwards that V phase moves forward 60 degree, waveform V2 and W2 of signal V1 and W after comparer compares with benchmark as shown in Figure 7 c, signal V2 and signal W2 are that amplitude is identical, dutycycle is close to 50%, the square wave that phase is 120 degree, there is noise in U1 no signal then comparer IC22 positive input terminal, benchmark due to comparer IC22 is the negative level lower than 0 level, therefore the output waveform U2 of comparer IC22 is high level.Signal V2 and signal W2 phase 120 degree; then signal U2, V2 and W2 line with after waveform be dutycycle close to 16.67% square wave; this signal delivers to signal acquisition process module 3; set the parameter of resistance R23, resistance R24 and electric capacity C23; output signal S3 just can be made to be low level signal; this signal delivers to output module 4, carries out input abnormal show, alarm and protection act.
Compared with prior art, a kind of vector device detecting three-phase phase sequence of the present invention can make a kind of detection device for phase sequence participating in controlling without the need to CPU, possess circuit simple, control to facilitate reliable feature, carry out signal output by simple indication warning circuit, also can be adjusted to the circuit possessing pile defection function simultaneously.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. detect a vector method for three-phase phase sequence, it is characterized in that: comprise the following steps:
S1: the three-phase electricity of input is converted to low-voltage signal;
S2: vector and Zero-cross comparator are carried out to this low-voltage signal, and carry out line and process;
S3: obtain an output signal after the signal after line and process is judged;
In described step S2 to the concrete steps that this low-voltage signal carries out vector be:
S21: any two-phase of getting this low-voltage signal;
S22: be the Phase delay 60 degree of leading phase signal by wherein default setting;
S23: be the Phase advance 60 degree of delayed phase signals by wherein default setting;
S24: the phase place of residue phase signals is carried out anti-phase process;
Judge the signal after line and process in described step S3, concrete determination methods is: if this signal is dutycycle be 50% square-wave signal, then three-phase electricity input signal phase sequence is correct, if this signal is low level signal, then three-phase electricity input signal phase sequence mistake.
2. a kind of vector method detecting three-phase phase sequence according to claim 1, is characterized in that: described output signal can be used in triggering indicating circuit, signal circuit, warning circuit or protection circuit.
3. detect a vector device for three-phase phase sequence, it is characterized in that: comprise three-phase electricity input detection module, a phase vectors conversion module, a signal acquisition process module and an output module; Described three-phase electricity input detection module receives three-phase electricity to be detected, and this three-phase electricity to be detected is converted to low-voltage signal; Described phase vectors conversion module receives this low-voltage signal and carries out vector and Zero-cross comparator to it, then carries out line and process; Described signal acquisition process module receive described phase vectors conversion module carry out line with process after signal carry out judging and obtain an output signal; Described output module receives this output signal; Described more delayed than U phase signals 120 degree of phase vectors conversion module default setting V phase signals, described more delayed than V phase signals 120 degree of phase vectors conversion module default setting W phase signals.
4. a kind of vector device detecting three-phase phase sequence according to claim 3, is characterized in that: described phase vectors conversion module adopts RC phase-shift circuit, LC phase-shift circuit or RL phase-shift circuit.
5. a kind of vector device detecting three-phase phase sequence according to claim 3, is characterized in that: described signal acquisition process module adopts hardware detection, software detection or software and hardware combining to detect.
6. a kind of vector device detecting three-phase phase sequence according to claim 3, is characterized in that: described output module comprises indicating circuit, signal circuit, warning circuit or protection circuit.
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