CN104655909B - A kind of circuit with symmetrical component method computing function - Google Patents
A kind of circuit with symmetrical component method computing function Download PDFInfo
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- CN104655909B CN104655909B CN201510112882.5A CN201510112882A CN104655909B CN 104655909 B CN104655909 B CN 104655909B CN 201510112882 A CN201510112882 A CN 201510112882A CN 104655909 B CN104655909 B CN 104655909B
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Abstract
The present invention relates to a kind of circuit with symmetrical component method computing function, it is characterized in that, three-phase and four-line input voltage is isolated into phase shift by three-phase transformer, pass through 60 degree of angle circuit calibrations of advanced 60 degree of angle circuits and hysteresis, processing of circuit is adjusted by addition and ratio, one group of positive sequence voltage, one group of backward voltage and residual voltage can be exported in output phase-shift circuit port.Fully achieve symmetrical component method computing function.This circuit design thinking is simple and clear, and analog functuion is strong, and device is few using device, and wiring is simple, easy to maintenance, can also can be applied in colleges and universities' Electrical Laboratory as student experimenting device in power system correlation test setting device.
Description
Technical field
It is real suitable for colleges and universities electrician the present invention relates to a kind of circuit and its device that can realize symmetrical component method computing function
Room is tested as student experimenting device, is also applied for applying during power system correlation test setting device.
Background technology
Symmetrical component method is that processing asymmetrical three-phase circuit is effectively calculated preferable method.Available circuit and device pair
Symmetrical component method is simulated and process circuit is more complicated, influences understanding and application of the beginner to this method.
The content of the invention
In view of above-mentioned deficiency, defeated by three-phase and four-line the present invention relates to a kind of circuit with the method computing function that weighs
Enter voltage and phase shift is isolated by three-phase transformer, by 60 degree of angle circuit calibrations of advanced 60 degree of angle circuits and hysteresis, by adding
Method and ratio adjust processing of circuit, and one group of positive sequence voltage, one group of backward voltage and zero sequence can be exported in output phase-shift circuit port
Voltage.Fully achieve symmetrical component method computing function.This circuit design thinking is simple and clear, and analog functuion is strong, and device uses
Device is few, and wiring is simple, easy to maintenance, can be in colleges and universities' Electrical Laboratory as student experimenting device, can also be in power train
Applied during system correlation test setting device.
Brief description of the drawings
Fig. 1 is theory diagram of the embodiment of the present invention.
Fig. 2 is the external terminal schematic diagram of the embodiment of the present invention
Fig. 3 is the physical circuit figure of the embodiment of the present invention
Embodiment
As shown in Figure 1, Figure 2, Fig. 3, the present invention are to provide a kind of circuit with symmetrical component method computing function, including：Three-phase
Transformer, advanced 60 degree of angle circuits, 60 degree of angle circuits are lagged, addition and ratio adjust circuit, and output phase-shift circuit is formed.
It is characterized in that：The b phases and c of three-phase transformer pair side are connected to 60 degree of circuits of advanced 60 degree of circuits and hysteresis, by addition and
Ratio adjusts circuit, then passes through two single-phase transformers and advanced 60 degree of circuits and 60 degree of electrical combinations of hysteresis, it is possible to achieve defeated
Go out one group of positive-sequence component voltage, backward component voltage and zero-sequence component voltage.
In figure 3, three-phase and four-line voltage is added in the original side of three-phase transformer, and transformer pays square a phases Same Name of Ends and main side one
Cause, b phases and c phases Same Name of Ends and main side are on the contrary, so UaPhase and UAUnanimously, b ends and the output of c ends are-UbWith-Uc,-UbPass through
60 ° of circuits are lagged, make U 'bPhase angle be equal to UB∠120°,-UcBy advanced 60 ° of circuits, make U 'cAngle be equal to Uc∠
240°。
The effect of circuit is adjusted by addition and ratio, is ensuredMeet
Calculating formula (wherein the K no-load voltage ratio comprising three-phase transformer and each operational amplification circuit of positive-sequence component in symmetrical component method
Amplification coefficient).U1aPass through a single-phase transformer again, transformer is anti-phase connection, then accesses advanced 60 degree of circuits and hysteresis
60 degree of circuits form U1bAnd U1c, thus there is U1a、U1bAnd U1cFor positive sequence voltage component.(see the corresponding voltage arrows of Fig. 3
Spirogram).Similarly, Ua、-UbWith-UcPass through the combination of 60 ° of circuits of corresponding advanced 60 ° of circuits and hysteresis so thatMeet the calculating formula of weighing method backward component, U2aIt is single-phase by one again
60 degree of circuits of the anti-phase connection of transformer and the advanced 60 degree of circuits of access and hysteresis form U2bAnd U2c, thus there is U2a、U2bAnd U2c
For negative sequence voltage components (see the corresponding voltage vector-diagrams of Fig. 3).
Therefore, zero-sequence component：So foregoing circuit can be real very well
The computing function of existing symmetrical component method, simply enters port output three-phase and four-line voltage, and the circuit can export positive sequence, inverse
Sequence, residual voltage.This circuit and device are applied to colleges and universities' Electrical Laboratory simulated experiment, can also be applied to power system phase
Close experiment setting device and equipment.Wherein, all amounts of the U with subscript are vector in Fig. 3, the DC current in Fig. 3 for ±
24V。
Above is presently preferred embodiments of the present invention, all changes made according to the technology of the present invention, caused function is not
During beyond the scope of technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (1)
- A kind of 1. circuit with symmetrical component method computing function, it is characterised in that:Three-phase and four-line input voltage is passed through into three-phase Transformer isolation phase shift, through 60 degree of circuit calibrations of advanced 60 degree of circuits and hysteresis, processing of circuit is adjusted through an addition and ratio, it is defeated The output end for going out phase-shift circuit exports one group of positive sequence voltage, one group of backward voltage and residual voltage；The three-phase transformer pair side a Mutually and main side's same-phase, b phases and c phases are with main side's opposite in phase, and three-phase transformer pair side b phases, c phases are with advanced 60 degree and lagging 60 degree of electrical combination connections, adjust circuit through addition and ratio and be connected with output phase-shift circuit；In the output phase-shift circuit Single-phase transformer is anti-phase to connect, and couples with advanced 60 degree and 60 degree of electrical combinations of hysteresis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112882.5A CN104655909B (en) | 2015-03-16 | 2015-03-16 | A kind of circuit with symmetrical component method computing function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112882.5A CN104655909B (en) | 2015-03-16 | 2015-03-16 | A kind of circuit with symmetrical component method computing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104655909A CN104655909A (en) | 2015-05-27 |
| CN104655909B true CN104655909B (en) | 2017-12-08 |
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| CN201510112882.5A Expired - Fee Related CN104655909B (en) | 2015-03-16 | 2015-03-16 | A kind of circuit with symmetrical component method computing function |
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| CN104181374A (en) * | 2014-08-08 | 2014-12-03 | 合肥工业大学 | Method for detecting and separating positive and negative sequence components of grid voltage of three-phase neutral-line-free system |
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2015
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Patent Citations (11)
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| CN103746338A (en) * | 2013-12-11 | 2014-04-23 | 西安交通大学 | Any phase-shifting angle special transformer differential protection method |
| CN103777076A (en) * | 2014-01-26 | 2014-05-07 | 国家电网公司 | Method for detecting any-th harmonic component and reactive current of three-phase four-wire system |
| CN104181374A (en) * | 2014-08-08 | 2014-12-03 | 合肥工业大学 | Method for detecting and separating positive and negative sequence components of grid voltage of three-phase neutral-line-free system |
| CN204631104U (en) * | 2015-03-16 | 2015-09-09 | 福建农林大学 | A kind of circuit with symmetrical component method computing function |
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| CN104655909A (en) | 2015-05-27 |
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